./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/combinations/Problem05_label46+token_ring.04.cil-2.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 53f42b1a Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24f5e808-6330-47ea-9eed-a06f0c801063/bin/utaipan-TEXQjIfE4P/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24f5e808-6330-47ea-9eed-a06f0c801063/bin/utaipan-TEXQjIfE4P/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24f5e808-6330-47ea-9eed-a06f0c801063/bin/utaipan-TEXQjIfE4P/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24f5e808-6330-47ea-9eed-a06f0c801063/bin/utaipan-TEXQjIfE4P/config/TaipanReach.xml -i ../../sv-benchmarks/c/combinations/Problem05_label46+token_ring.04.cil-2.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24f5e808-6330-47ea-9eed-a06f0c801063/bin/utaipan-TEXQjIfE4P/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24f5e808-6330-47ea-9eed-a06f0c801063/bin/utaipan-TEXQjIfE4P --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 7640909f7ef47a12c6daa58dacf29a693ba9f7401fa2c48138a16311fc07e97d --- Real Ultimate output --- This is Ultimate 0.2.1-dev-53f42b1 [2021-11-21 00:52:10,786 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-21 00:52:10,789 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-21 00:52:10,847 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-21 00:52:10,847 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-21 00:52:10,852 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-21 00:52:10,854 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-21 00:52:10,858 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-21 00:52:10,861 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-21 00:52:10,866 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-21 00:52:10,867 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-21 00:52:10,869 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-21 00:52:10,870 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-21 00:52:10,873 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-21 00:52:10,875 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-21 00:52:10,881 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-21 00:52:10,884 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-21 00:52:10,885 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-21 00:52:10,888 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-21 00:52:10,899 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-21 00:52:10,901 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-21 00:52:10,902 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-21 00:52:10,905 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-21 00:52:10,906 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-21 00:52:10,915 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-21 00:52:10,916 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-21 00:52:10,916 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-21 00:52:10,918 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-21 00:52:10,919 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-21 00:52:10,920 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-21 00:52:10,921 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-21 00:52:10,922 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-21 00:52:10,924 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-21 00:52:10,925 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-21 00:52:10,926 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-21 00:52:10,927 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-21 00:52:10,928 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-21 00:52:10,928 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-21 00:52:10,928 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-21 00:52:10,929 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-21 00:52:10,930 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-21 00:52:10,931 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24f5e808-6330-47ea-9eed-a06f0c801063/bin/utaipan-TEXQjIfE4P/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-21 00:52:10,977 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-21 00:52:10,977 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-21 00:52:10,978 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-21 00:52:10,978 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-21 00:52:10,979 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-21 00:52:10,979 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-21 00:52:10,980 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-21 00:52:10,980 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-21 00:52:10,980 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-21 00:52:10,980 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-21 00:52:10,981 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-21 00:52:10,981 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-21 00:52:10,982 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-21 00:52:10,982 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-21 00:52:10,982 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-21 00:52:10,982 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-21 00:52:10,982 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-21 00:52:10,983 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-21 00:52:10,983 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-21 00:52:10,984 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-21 00:52:10,984 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-21 00:52:10,984 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-21 00:52:10,984 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-21 00:52:10,984 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-21 00:52:10,985 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-21 00:52:10,985 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-21 00:52:10,986 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-21 00:52:10,987 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-21 00:52:10,987 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-21 00:52:10,987 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-21 00:52:10,987 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-21 00:52:10,988 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-21 00:52:10,988 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-21 00:52:10,988 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-21 00:52:10,988 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-21 00:52:10,988 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-21 00:52:10,989 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-21 00:52:10,989 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-21 00:52:10,989 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-21 00:52:10,989 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-21 00:52:10,989 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-21 00:52:10,989 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_24f5e808-6330-47ea-9eed-a06f0c801063/bin/utaipan-TEXQjIfE4P/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24f5e808-6330-47ea-9eed-a06f0c801063/bin/utaipan-TEXQjIfE4P Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 7640909f7ef47a12c6daa58dacf29a693ba9f7401fa2c48138a16311fc07e97d [2021-11-21 00:52:11,340 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-21 00:52:11,366 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-21 00:52:11,368 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-21 00:52:11,369 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-21 00:52:11,370 INFO L275 PluginConnector]: CDTParser initialized [2021-11-21 00:52:11,372 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24f5e808-6330-47ea-9eed-a06f0c801063/bin/utaipan-TEXQjIfE4P/../../sv-benchmarks/c/combinations/Problem05_label46+token_ring.04.cil-2.c [2021-11-21 00:52:11,454 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24f5e808-6330-47ea-9eed-a06f0c801063/bin/utaipan-TEXQjIfE4P/data/7b089ae1c/9d55febb92994c56993a6942d7923938/FLAGf650ca7f5 [2021-11-21 00:52:12,553 INFO L306 CDTParser]: Found 1 translation units. [2021-11-21 00:52:12,553 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24f5e808-6330-47ea-9eed-a06f0c801063/sv-benchmarks/c/combinations/Problem05_label46+token_ring.04.cil-2.c [2021-11-21 00:52:12,610 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24f5e808-6330-47ea-9eed-a06f0c801063/bin/utaipan-TEXQjIfE4P/data/7b089ae1c/9d55febb92994c56993a6942d7923938/FLAGf650ca7f5 [2021-11-21 00:52:12,828 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24f5e808-6330-47ea-9eed-a06f0c801063/bin/utaipan-TEXQjIfE4P/data/7b089ae1c/9d55febb92994c56993a6942d7923938 [2021-11-21 00:52:12,830 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-21 00:52:12,831 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-21 00:52:12,834 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-21 00:52:12,834 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-21 00:52:12,838 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-21 00:52:12,839 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 12:52:12" (1/1) ... [2021-11-21 00:52:12,840 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@ff2cb5f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:52:12, skipping insertion in model container [2021-11-21 00:52:12,841 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 12:52:12" (1/1) ... [2021-11-21 00:52:12,848 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-21 00:52:13,092 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-21 00:52:15,473 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_24f5e808-6330-47ea-9eed-a06f0c801063/sv-benchmarks/c/combinations/Problem05_label46+token_ring.04.cil-2.c[382357,382370] [2021-11-21 00:52:15,504 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_24f5e808-6330-47ea-9eed-a06f0c801063/sv-benchmarks/c/combinations/Problem05_label46+token_ring.04.cil-2.c[383339,383352] [2021-11-21 00:52:15,723 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-21 00:52:15,734 INFO L203 MainTranslator]: Completed pre-run [2021-11-21 00:52:16,997 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_24f5e808-6330-47ea-9eed-a06f0c801063/sv-benchmarks/c/combinations/Problem05_label46+token_ring.04.cil-2.c[382357,382370] [2021-11-21 00:52:17,000 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_24f5e808-6330-47ea-9eed-a06f0c801063/sv-benchmarks/c/combinations/Problem05_label46+token_ring.04.cil-2.c[383339,383352] [2021-11-21 00:52:17,015 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-21 00:52:17,092 INFO L208 MainTranslator]: Completed translation [2021-11-21 00:52:17,093 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:52:17 WrapperNode [2021-11-21 00:52:17,093 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-21 00:52:17,094 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-21 00:52:17,094 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-21 00:52:17,094 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-21 00:52:17,102 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:52:17" (1/1) ... [2021-11-21 00:52:17,210 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:52:17" (1/1) ... [2021-11-21 00:52:17,713 INFO L137 Inliner]: procedures = 52, calls = 54, calls flagged for inlining = 29, calls inlined = 29, statements flattened = 12740 [2021-11-21 00:52:17,714 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-21 00:52:17,714 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-21 00:52:17,715 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-21 00:52:17,715 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-21 00:52:17,724 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:52:17" (1/1) ... [2021-11-21 00:52:17,725 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:52:17" (1/1) ... [2021-11-21 00:52:17,840 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:52:17" (1/1) ... [2021-11-21 00:52:17,841 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:52:17" (1/1) ... [2021-11-21 00:52:18,084 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:52:17" (1/1) ... [2021-11-21 00:52:18,145 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:52:17" (1/1) ... [2021-11-21 00:52:18,167 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:52:17" (1/1) ... [2021-11-21 00:52:18,224 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-21 00:52:18,225 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-21 00:52:18,225 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-21 00:52:18,225 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-21 00:52:18,226 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:52:17" (1/1) ... [2021-11-21 00:52:18,235 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-21 00:52:18,247 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24f5e808-6330-47ea-9eed-a06f0c801063/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:52:18,265 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24f5e808-6330-47ea-9eed-a06f0c801063/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-21 00:52:18,279 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24f5e808-6330-47ea-9eed-a06f0c801063/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-21 00:52:18,310 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-21 00:52:18,311 INFO L130 BoogieDeclarations]: Found specification of procedure activate_threads [2021-11-21 00:52:18,311 INFO L138 BoogieDeclarations]: Found implementation of procedure activate_threads [2021-11-21 00:52:18,311 INFO L130 BoogieDeclarations]: Found specification of procedure immediate_notify [2021-11-21 00:52:18,311 INFO L138 BoogieDeclarations]: Found implementation of procedure immediate_notify [2021-11-21 00:52:18,311 INFO L130 BoogieDeclarations]: Found specification of procedure update_channels [2021-11-21 00:52:18,311 INFO L138 BoogieDeclarations]: Found implementation of procedure update_channels [2021-11-21 00:52:18,312 INFO L130 BoogieDeclarations]: Found specification of procedure error [2021-11-21 00:52:18,312 INFO L138 BoogieDeclarations]: Found implementation of procedure error [2021-11-21 00:52:18,312 INFO L130 BoogieDeclarations]: Found specification of procedure fire_delta_events [2021-11-21 00:52:18,312 INFO L138 BoogieDeclarations]: Found implementation of procedure fire_delta_events [2021-11-21 00:52:18,312 INFO L130 BoogieDeclarations]: Found specification of procedure exists_runnable_thread [2021-11-21 00:52:18,312 INFO L138 BoogieDeclarations]: Found implementation of procedure exists_runnable_thread [2021-11-21 00:52:18,313 INFO L130 BoogieDeclarations]: Found specification of procedure reset_delta_events [2021-11-21 00:52:18,313 INFO L138 BoogieDeclarations]: Found implementation of procedure reset_delta_events [2021-11-21 00:52:18,313 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-21 00:52:18,313 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-21 00:52:18,313 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-21 00:52:18,433 INFO L236 CfgBuilder]: Building ICFG [2021-11-21 00:52:18,434 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-21 00:52:26,315 INFO L277 CfgBuilder]: Performing block encoding [2021-11-21 00:52:28,220 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-21 00:52:28,221 INFO L301 CfgBuilder]: Removed 8 assume(true) statements. [2021-11-21 00:52:28,226 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 12:52:28 BoogieIcfgContainer [2021-11-21 00:52:28,227 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-21 00:52:28,229 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-21 00:52:28,229 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-21 00:52:28,232 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-21 00:52:28,233 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.11 12:52:12" (1/3) ... [2021-11-21 00:52:28,234 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4c49339e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 12:52:28, skipping insertion in model container [2021-11-21 00:52:28,234 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:52:17" (2/3) ... [2021-11-21 00:52:28,234 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4c49339e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 12:52:28, skipping insertion in model container [2021-11-21 00:52:28,235 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 12:52:28" (3/3) ... [2021-11-21 00:52:28,237 INFO L111 eAbstractionObserver]: Analyzing ICFG Problem05_label46+token_ring.04.cil-2.c [2021-11-21 00:52:28,243 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-21 00:52:28,244 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 2 error locations. [2021-11-21 00:52:28,304 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-21 00:52:28,313 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 [2021-11-21 00:52:28,314 INFO L340 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-11-21 00:52:28,387 INFO L276 IsEmpty]: Start isEmpty. Operand has 1749 states, 1719 states have (on average 1.9726585223967423) internal successors, (3391), 1724 states have internal predecessors, (3391), 20 states have call successors, (20), 7 states have call predecessors, (20), 7 states have return successors, (20), 19 states have call predecessors, (20), 20 states have call successors, (20) [2021-11-21 00:52:28,400 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-11-21 00:52:28,401 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:52:28,401 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] [2021-11-21 00:52:28,402 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:52:28,410 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:52:28,411 INFO L85 PathProgramCache]: Analyzing trace with hash -1889804059, now seen corresponding path program 1 times [2021-11-21 00:52:28,422 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:52:28,422 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [353619650] [2021-11-21 00:52:28,423 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:52:28,424 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:52:28,613 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:52:28,827 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:52:28,827 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:52:28,828 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [353619650] [2021-11-21 00:52:28,829 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [353619650] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:52:28,829 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:52:28,844 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-21 00:52:28,846 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1959788373] [2021-11-21 00:52:28,846 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:52:28,851 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-21 00:52:28,851 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:52:28,890 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-21 00:52:28,890 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-21 00:52:28,898 INFO L87 Difference]: Start difference. First operand has 1749 states, 1719 states have (on average 1.9726585223967423) internal successors, (3391), 1724 states have internal predecessors, (3391), 20 states have call successors, (20), 7 states have call predecessors, (20), 7 states have return successors, (20), 19 states have call predecessors, (20), 20 states have call successors, (20) Second operand has 4 states, 4 states have (on average 8.25) internal successors, (33), 4 states have internal predecessors, (33), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2021-11-21 00:52:29,807 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:52:29,808 INFO L93 Difference]: Finished difference Result 3580 states and 6999 transitions. [2021-11-21 00:52:29,809 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-21 00:52:29,811 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 8.25) internal successors, (33), 4 states have internal predecessors, (33), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) Word has length 44 [2021-11-21 00:52:29,811 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:52:29,848 INFO L225 Difference]: With dead ends: 3580 [2021-11-21 00:52:29,848 INFO L226 Difference]: Without dead ends: 1830 [2021-11-21 00:52:29,860 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-21 00:52:29,866 INFO L933 BasicCegarLoop]: 3278 mSDtfsCounter, 3523 mSDsluCounter, 3471 mSDsCounter, 0 mSdLazyCounter, 602 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3523 SdHoareTripleChecker+Valid, 6488 SdHoareTripleChecker+Invalid, 616 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 602 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-21 00:52:29,868 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3523 Valid, 6488 Invalid, 616 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 602 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-21 00:52:29,891 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1830 states. [2021-11-21 00:52:30,019 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1830 to 1829. [2021-11-21 00:52:30,026 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1829 states, 1781 states have (on average 1.948343627175744) internal successors, (3470), 1785 states have internal predecessors, (3470), 34 states have call successors, (34), 13 states have call predecessors, (34), 12 states have return successors, (32), 31 states have call predecessors, (32), 32 states have call successors, (32) [2021-11-21 00:52:30,039 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1829 states to 1829 states and 3536 transitions. [2021-11-21 00:52:30,041 INFO L78 Accepts]: Start accepts. Automaton has 1829 states and 3536 transitions. Word has length 44 [2021-11-21 00:52:30,042 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:52:30,042 INFO L470 AbstractCegarLoop]: Abstraction has 1829 states and 3536 transitions. [2021-11-21 00:52:30,043 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 8.25) internal successors, (33), 4 states have internal predecessors, (33), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2021-11-21 00:52:30,043 INFO L276 IsEmpty]: Start isEmpty. Operand 1829 states and 3536 transitions. [2021-11-21 00:52:30,052 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2021-11-21 00:52:30,053 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:52:30,053 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:52:30,053 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-21 00:52:30,053 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:52:30,054 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:52:30,054 INFO L85 PathProgramCache]: Analyzing trace with hash -879197948, now seen corresponding path program 1 times [2021-11-21 00:52:30,054 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:52:30,054 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1836732838] [2021-11-21 00:52:30,055 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:52:30,055 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:52:30,081 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:52:30,156 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-21 00:52:30,157 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:52:30,157 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1836732838] [2021-11-21 00:52:30,157 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1836732838] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:52:30,158 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1099903926] [2021-11-21 00:52:30,158 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:52:30,158 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:52:30,159 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24f5e808-6330-47ea-9eed-a06f0c801063/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:52:30,172 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24f5e808-6330-47ea-9eed-a06f0c801063/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:52:30,191 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24f5e808-6330-47ea-9eed-a06f0c801063/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-21 00:52:30,312 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:52:30,319 INFO L263 TraceCheckSpWp]: Trace formula consists of 499 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-21 00:52:30,335 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:52:30,549 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-21 00:52:30,549 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 00:52:30,554 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1099903926] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:52:30,555 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-21 00:52:30,556 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2021-11-21 00:52:30,557 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [496255731] [2021-11-21 00:52:30,557 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:52:30,558 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 00:52:30,567 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:52:30,567 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 00:52:30,568 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-21 00:52:30,568 INFO L87 Difference]: Start difference. First operand 1829 states and 3536 transitions. Second operand has 3 states, 3 states have (on average 17.666666666666668) internal successors, (53), 2 states have internal predecessors, (53), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-21 00:52:31,015 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:52:31,016 INFO L93 Difference]: Finished difference Result 2188 states and 4059 transitions. [2021-11-21 00:52:31,016 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 00:52:31,016 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 17.666666666666668) internal successors, (53), 2 states have internal predecessors, (53), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 81 [2021-11-21 00:52:31,017 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:52:31,033 INFO L225 Difference]: With dead ends: 2188 [2021-11-21 00:52:31,033 INFO L226 Difference]: Without dead ends: 2005 [2021-11-21 00:52:31,035 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 81 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-21 00:52:31,037 INFO L933 BasicCegarLoop]: 3221 mSDtfsCounter, 3389 mSDsluCounter, 132 mSDsCounter, 0 mSdLazyCounter, 271 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3389 SdHoareTripleChecker+Valid, 3333 SdHoareTripleChecker+Invalid, 273 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 271 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-21 00:52:31,037 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3389 Valid, 3333 Invalid, 273 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 271 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-21 00:52:31,042 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2005 states. [2021-11-21 00:52:31,103 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2005 to 1999. [2021-11-21 00:52:31,109 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1999 states, 1913 states have (on average 1.9116570831155253) internal successors, (3657), 1918 states have internal predecessors, (3657), 60 states have call successors, (60), 25 states have call predecessors, (60), 24 states have return successors, (58), 56 states have call predecessors, (58), 58 states have call successors, (58) [2021-11-21 00:52:31,122 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1999 states to 1999 states and 3775 transitions. [2021-11-21 00:52:31,123 INFO L78 Accepts]: Start accepts. Automaton has 1999 states and 3775 transitions. Word has length 81 [2021-11-21 00:52:31,123 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:52:31,123 INFO L470 AbstractCegarLoop]: Abstraction has 1999 states and 3775 transitions. [2021-11-21 00:52:31,124 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 17.666666666666668) internal successors, (53), 2 states have internal predecessors, (53), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-21 00:52:31,124 INFO L276 IsEmpty]: Start isEmpty. Operand 1999 states and 3775 transitions. [2021-11-21 00:52:31,128 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2021-11-21 00:52:31,128 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:52:31,128 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:52:31,163 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24f5e808-6330-47ea-9eed-a06f0c801063/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-21 00:52:31,344 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24f5e808-6330-47ea-9eed-a06f0c801063/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:52:31,344 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:52:31,345 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:52:31,345 INFO L85 PathProgramCache]: Analyzing trace with hash -159104796, now seen corresponding path program 1 times [2021-11-21 00:52:31,345 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:52:31,346 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1838521864] [2021-11-21 00:52:31,346 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:52:31,347 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:52:31,368 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:52:31,558 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-21 00:52:31,560 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:52:31,561 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1838521864] [2021-11-21 00:52:31,561 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1838521864] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:52:31,564 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [961472102] [2021-11-21 00:52:31,567 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:52:31,567 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:52:31,567 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24f5e808-6330-47ea-9eed-a06f0c801063/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:52:31,572 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24f5e808-6330-47ea-9eed-a06f0c801063/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:52:31,598 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24f5e808-6330-47ea-9eed-a06f0c801063/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-21 00:52:31,732 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:52:31,735 INFO L263 TraceCheckSpWp]: Trace formula consists of 493 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-21 00:52:31,738 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:52:31,949 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-11-21 00:52:31,949 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 00:52:31,949 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [961472102] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:52:31,949 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-21 00:52:31,950 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2021-11-21 00:52:31,950 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1571421267] [2021-11-21 00:52:31,950 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:52:31,951 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 00:52:31,951 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:52:31,951 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 00:52:31,951 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-21 00:52:31,952 INFO L87 Difference]: Start difference. First operand 1999 states and 3775 transitions. Second operand has 3 states, 3 states have (on average 16.666666666666668) internal successors, (50), 2 states have internal predecessors, (50), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-21 00:52:32,398 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:52:32,399 INFO L93 Difference]: Finished difference Result 2692 states and 4778 transitions. [2021-11-21 00:52:32,399 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 00:52:32,399 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 16.666666666666668) internal successors, (50), 2 states have internal predecessors, (50), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 81 [2021-11-21 00:52:32,400 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:52:32,416 INFO L225 Difference]: With dead ends: 2692 [2021-11-21 00:52:32,416 INFO L226 Difference]: Without dead ends: 2339 [2021-11-21 00:52:32,419 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 81 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-21 00:52:32,420 INFO L933 BasicCegarLoop]: 3220 mSDtfsCounter, 3392 mSDsluCounter, 132 mSDsCounter, 0 mSdLazyCounter, 271 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3392 SdHoareTripleChecker+Valid, 3332 SdHoareTripleChecker+Invalid, 273 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 271 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-21 00:52:32,421 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3392 Valid, 3332 Invalid, 273 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 271 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-21 00:52:32,426 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2339 states. [2021-11-21 00:52:32,491 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2339 to 2331. [2021-11-21 00:52:32,497 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2331 states, 2171 states have (on average 1.8512206356517733) internal successors, (4019), 2178 states have internal predecessors, (4019), 110 states have call successors, (110), 49 states have call predecessors, (110), 48 states have return successors, (108), 104 states have call predecessors, (108), 108 states have call successors, (108) [2021-11-21 00:52:32,513 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2331 states to 2331 states and 4237 transitions. [2021-11-21 00:52:32,513 INFO L78 Accepts]: Start accepts. Automaton has 2331 states and 4237 transitions. Word has length 81 [2021-11-21 00:52:32,514 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:52:32,514 INFO L470 AbstractCegarLoop]: Abstraction has 2331 states and 4237 transitions. [2021-11-21 00:52:32,514 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 16.666666666666668) internal successors, (50), 2 states have internal predecessors, (50), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-21 00:52:32,514 INFO L276 IsEmpty]: Start isEmpty. Operand 2331 states and 4237 transitions. [2021-11-21 00:52:32,517 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2021-11-21 00:52:32,518 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:52:32,518 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:52:32,556 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24f5e808-6330-47ea-9eed-a06f0c801063/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-21 00:52:32,731 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24f5e808-6330-47ea-9eed-a06f0c801063/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:52:32,732 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:52:32,732 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:52:32,733 INFO L85 PathProgramCache]: Analyzing trace with hash -1225657084, now seen corresponding path program 1 times [2021-11-21 00:52:32,733 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:52:32,733 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [479730893] [2021-11-21 00:52:32,733 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:52:32,733 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:52:32,770 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:52:32,823 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2021-11-21 00:52:32,824 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:52:32,824 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [479730893] [2021-11-21 00:52:32,824 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [479730893] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:52:32,824 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:52:32,824 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-21 00:52:32,825 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [260267732] [2021-11-21 00:52:32,825 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:52:32,825 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 00:52:32,825 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:52:32,826 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 00:52:32,826 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 00:52:32,826 INFO L87 Difference]: Start difference. First operand 2331 states and 4237 transitions. Second operand has 3 states, 3 states have (on average 15.666666666666666) internal successors, (47), 3 states have internal predecessors, (47), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2021-11-21 00:52:33,337 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:52:33,337 INFO L93 Difference]: Finished difference Result 2867 states and 5012 transitions. [2021-11-21 00:52:33,338 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 00:52:33,338 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 15.666666666666666) internal successors, (47), 3 states have internal predecessors, (47), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) Word has length 81 [2021-11-21 00:52:33,339 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:52:33,355 INFO L225 Difference]: With dead ends: 2867 [2021-11-21 00:52:33,356 INFO L226 Difference]: Without dead ends: 2507 [2021-11-21 00:52:33,358 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 00:52:33,359 INFO L933 BasicCegarLoop]: 3235 mSDtfsCounter, 55 mSDsluCounter, 3414 mSDsCounter, 0 mSdLazyCounter, 490 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 55 SdHoareTripleChecker+Valid, 6416 SdHoareTripleChecker+Invalid, 490 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 490 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-21 00:52:33,360 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [55 Valid, 6416 Invalid, 490 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 490 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-21 00:52:33,364 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2507 states. [2021-11-21 00:52:33,433 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2507 to 2435. [2021-11-21 00:52:33,439 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2435 states, 2267 states have (on average 1.843405381561535) internal successors, (4179), 2274 states have internal predecessors, (4179), 114 states have call successors, (114), 53 states have call predecessors, (114), 52 states have return successors, (112), 108 states have call predecessors, (112), 112 states have call successors, (112) [2021-11-21 00:52:33,454 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2435 states to 2435 states and 4405 transitions. [2021-11-21 00:52:33,454 INFO L78 Accepts]: Start accepts. Automaton has 2435 states and 4405 transitions. Word has length 81 [2021-11-21 00:52:33,455 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:52:33,455 INFO L470 AbstractCegarLoop]: Abstraction has 2435 states and 4405 transitions. [2021-11-21 00:52:33,455 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 15.666666666666666) internal successors, (47), 3 states have internal predecessors, (47), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2021-11-21 00:52:33,456 INFO L276 IsEmpty]: Start isEmpty. Operand 2435 states and 4405 transitions. [2021-11-21 00:52:33,460 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2021-11-21 00:52:33,460 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:52:33,460 INFO L514 BasicCegarLoop]: trace histogram [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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:52:33,460 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-11-21 00:52:33,461 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:52:33,461 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:52:33,461 INFO L85 PathProgramCache]: Analyzing trace with hash 1975361890, now seen corresponding path program 1 times [2021-11-21 00:52:33,462 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:52:33,462 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [243867890] [2021-11-21 00:52:33,462 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:52:33,462 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:52:33,492 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:52:33,535 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 54 trivial. 0 not checked. [2021-11-21 00:52:33,536 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:52:33,536 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [243867890] [2021-11-21 00:52:33,537 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [243867890] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:52:33,537 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:52:33,544 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-21 00:52:33,544 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1144467095] [2021-11-21 00:52:33,544 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:52:33,545 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 00:52:33,545 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:52:33,545 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 00:52:33,545 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 00:52:33,546 INFO L87 Difference]: Start difference. First operand 2435 states and 4405 transitions. Second operand has 3 states, 3 states have (on average 18.0) internal successors, (54), 3 states have internal predecessors, (54), 3 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-21 00:52:33,998 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:52:33,999 INFO L93 Difference]: Finished difference Result 3976 states and 6646 transitions. [2021-11-21 00:52:33,999 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 00:52:34,000 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 18.0) internal successors, (54), 3 states have internal predecessors, (54), 3 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 107 [2021-11-21 00:52:34,000 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:52:34,020 INFO L225 Difference]: With dead ends: 3976 [2021-11-21 00:52:34,020 INFO L226 Difference]: Without dead ends: 3187 [2021-11-21 00:52:34,024 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 00:52:34,025 INFO L933 BasicCegarLoop]: 3203 mSDtfsCounter, 3383 mSDsluCounter, 132 mSDsCounter, 0 mSdLazyCounter, 266 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3383 SdHoareTripleChecker+Valid, 3315 SdHoareTripleChecker+Invalid, 268 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 266 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-21 00:52:34,026 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3383 Valid, 3315 Invalid, 268 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 266 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-21 00:52:34,031 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3187 states. [2021-11-21 00:52:34,131 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3187 to 3171. [2021-11-21 00:52:34,139 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3171 states, 2851 states have (on average 1.7562258856541564) internal successors, (5007), 2862 states have internal predecessors, (5007), 214 states have call successors, (214), 105 states have call predecessors, (214), 104 states have return successors, (212), 204 states have call predecessors, (212), 212 states have call successors, (212) [2021-11-21 00:52:34,166 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3171 states to 3171 states and 5433 transitions. [2021-11-21 00:52:34,167 INFO L78 Accepts]: Start accepts. Automaton has 3171 states and 5433 transitions. Word has length 107 [2021-11-21 00:52:34,168 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:52:34,168 INFO L470 AbstractCegarLoop]: Abstraction has 3171 states and 5433 transitions. [2021-11-21 00:52:34,168 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 18.0) internal successors, (54), 3 states have internal predecessors, (54), 3 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-21 00:52:34,168 INFO L276 IsEmpty]: Start isEmpty. Operand 3171 states and 5433 transitions. [2021-11-21 00:52:34,179 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2021-11-21 00:52:34,179 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:52:34,179 INFO L514 BasicCegarLoop]: trace histogram [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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:52:34,180 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-11-21 00:52:34,180 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:52:34,180 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:52:34,181 INFO L85 PathProgramCache]: Analyzing trace with hash 758170359, now seen corresponding path program 1 times [2021-11-21 00:52:34,181 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:52:34,181 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1969315370] [2021-11-21 00:52:34,181 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:52:34,181 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:52:34,222 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:52:34,283 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 54 trivial. 0 not checked. [2021-11-21 00:52:34,283 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:52:34,283 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1969315370] [2021-11-21 00:52:34,283 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1969315370] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:52:34,284 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:52:34,284 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-21 00:52:34,284 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [216397155] [2021-11-21 00:52:34,284 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:52:34,285 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 00:52:34,285 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:52:34,285 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 00:52:34,285 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 00:52:34,286 INFO L87 Difference]: Start difference. First operand 3171 states and 5433 transitions. Second operand has 3 states, 3 states have (on average 18.0) internal successors, (54), 3 states have internal predecessors, (54), 3 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-21 00:52:34,784 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:52:34,784 INFO L93 Difference]: Finished difference Result 6148 states and 9706 transitions. [2021-11-21 00:52:34,784 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 00:52:34,785 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 18.0) internal successors, (54), 3 states have internal predecessors, (54), 3 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 107 [2021-11-21 00:52:34,786 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:52:34,818 INFO L225 Difference]: With dead ends: 6148 [2021-11-21 00:52:34,818 INFO L226 Difference]: Without dead ends: 4623 [2021-11-21 00:52:34,825 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 00:52:34,827 INFO L933 BasicCegarLoop]: 3212 mSDtfsCounter, 3386 mSDsluCounter, 132 mSDsCounter, 0 mSdLazyCounter, 266 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3386 SdHoareTripleChecker+Valid, 3324 SdHoareTripleChecker+Invalid, 268 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 266 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-21 00:52:34,827 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3386 Valid, 3324 Invalid, 268 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 266 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-21 00:52:34,835 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4623 states. [2021-11-21 00:52:35,159 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4623 to 4595. [2021-11-21 00:52:35,170 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4595 states, 3979 states have (on average 1.6544357878864036) internal successors, (6583), 3998 states have internal predecessors, (6583), 406 states have call successors, (406), 209 states have call predecessors, (406), 208 states have return successors, (404), 388 states have call predecessors, (404), 404 states have call successors, (404) [2021-11-21 00:52:35,197 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4595 states to 4595 states and 7393 transitions. [2021-11-21 00:52:35,198 INFO L78 Accepts]: Start accepts. Automaton has 4595 states and 7393 transitions. Word has length 107 [2021-11-21 00:52:35,198 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:52:35,198 INFO L470 AbstractCegarLoop]: Abstraction has 4595 states and 7393 transitions. [2021-11-21 00:52:35,199 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 18.0) internal successors, (54), 3 states have internal predecessors, (54), 3 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-21 00:52:35,199 INFO L276 IsEmpty]: Start isEmpty. Operand 4595 states and 7393 transitions. [2021-11-21 00:52:35,211 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2021-11-21 00:52:35,211 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:52:35,212 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, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:52:35,212 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-11-21 00:52:35,212 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:52:35,212 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:52:35,213 INFO L85 PathProgramCache]: Analyzing trace with hash 1997528255, now seen corresponding path program 1 times [2021-11-21 00:52:35,213 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:52:35,213 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [134339362] [2021-11-21 00:52:35,213 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:52:35,213 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:52:35,237 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:52:35,324 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 10 proven. 33 refuted. 0 times theorem prover too weak. 39 trivial. 0 not checked. [2021-11-21 00:52:35,325 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:52:35,325 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [134339362] [2021-11-21 00:52:35,325 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [134339362] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:52:35,325 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1630454371] [2021-11-21 00:52:35,326 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:52:35,326 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:52:35,326 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24f5e808-6330-47ea-9eed-a06f0c801063/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:52:35,327 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24f5e808-6330-47ea-9eed-a06f0c801063/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:52:35,343 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24f5e808-6330-47ea-9eed-a06f0c801063/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-21 00:52:35,468 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:52:35,471 INFO L263 TraceCheckSpWp]: Trace formula consists of 654 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-21 00:52:35,476 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:52:35,730 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 68 proven. 0 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-11-21 00:52:35,730 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 00:52:35,731 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1630454371] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:52:35,731 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-21 00:52:35,731 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2021-11-21 00:52:35,731 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [816642543] [2021-11-21 00:52:35,731 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:52:35,732 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 00:52:35,732 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:52:35,732 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 00:52:35,732 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-21 00:52:35,733 INFO L87 Difference]: Start difference. First operand 4595 states and 7393 transitions. Second operand has 3 states, 3 states have (on average 29.666666666666668) internal successors, (89), 3 states have internal predecessors, (89), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2021-11-21 00:52:36,305 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:52:36,305 INFO L93 Difference]: Finished difference Result 6139 states and 9671 transitions. [2021-11-21 00:52:36,306 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 00:52:36,306 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 29.666666666666668) internal successors, (89), 3 states have internal predecessors, (89), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) Word has length 124 [2021-11-21 00:52:36,306 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:52:36,336 INFO L225 Difference]: With dead ends: 6139 [2021-11-21 00:52:36,337 INFO L226 Difference]: Without dead ends: 4615 [2021-11-21 00:52:36,344 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 131 GetRequests, 126 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-21 00:52:36,345 INFO L933 BasicCegarLoop]: 3263 mSDtfsCounter, 113 mSDsluCounter, 3404 mSDsCounter, 0 mSdLazyCounter, 496 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 113 SdHoareTripleChecker+Valid, 6433 SdHoareTripleChecker+Invalid, 498 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 496 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-21 00:52:36,346 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [113 Valid, 6433 Invalid, 498 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 496 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-21 00:52:36,353 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4615 states. [2021-11-21 00:52:36,516 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4615 to 4579. [2021-11-21 00:52:36,540 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4579 states, 3963 states have (on average 1.640928589452435) internal successors, (6503), 3982 states have internal predecessors, (6503), 406 states have call successors, (406), 209 states have call predecessors, (406), 208 states have return successors, (404), 388 states have call predecessors, (404), 404 states have call successors, (404) [2021-11-21 00:52:36,556 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4579 states to 4579 states and 7313 transitions. [2021-11-21 00:52:36,557 INFO L78 Accepts]: Start accepts. Automaton has 4579 states and 7313 transitions. Word has length 124 [2021-11-21 00:52:36,557 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:52:36,558 INFO L470 AbstractCegarLoop]: Abstraction has 4579 states and 7313 transitions. [2021-11-21 00:52:36,559 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 29.666666666666668) internal successors, (89), 3 states have internal predecessors, (89), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2021-11-21 00:52:36,559 INFO L276 IsEmpty]: Start isEmpty. Operand 4579 states and 7313 transitions. [2021-11-21 00:52:36,572 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2021-11-21 00:52:36,572 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:52:36,572 INFO L514 BasicCegarLoop]: trace histogram [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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:52:36,610 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24f5e808-6330-47ea-9eed-a06f0c801063/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-21 00:52:36,788 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24f5e808-6330-47ea-9eed-a06f0c801063/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2021-11-21 00:52:36,788 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:52:36,788 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:52:36,789 INFO L85 PathProgramCache]: Analyzing trace with hash -333810623, now seen corresponding path program 1 times [2021-11-21 00:52:36,789 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:52:36,789 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1335155929] [2021-11-21 00:52:36,789 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:52:36,789 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:52:36,810 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:52:36,879 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 10 proven. 31 refuted. 0 times theorem prover too weak. 39 trivial. 0 not checked. [2021-11-21 00:52:36,879 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:52:36,879 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1335155929] [2021-11-21 00:52:36,879 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1335155929] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:52:36,880 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1222864315] [2021-11-21 00:52:36,880 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:52:36,880 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:52:36,880 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24f5e808-6330-47ea-9eed-a06f0c801063/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:52:36,881 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24f5e808-6330-47ea-9eed-a06f0c801063/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:52:36,897 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24f5e808-6330-47ea-9eed-a06f0c801063/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-21 00:52:37,016 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:52:37,019 INFO L263 TraceCheckSpWp]: Trace formula consists of 660 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-21 00:52:37,023 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:52:37,294 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 57 proven. 0 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2021-11-21 00:52:37,294 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 00:52:37,295 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1222864315] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:52:37,295 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-21 00:52:37,295 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2021-11-21 00:52:37,295 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1929876756] [2021-11-21 00:52:37,295 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:52:37,296 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 00:52:37,296 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:52:37,296 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 00:52:37,300 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-21 00:52:37,300 INFO L87 Difference]: Start difference. First operand 4579 states and 7313 transitions. Second operand has 3 states, 3 states have (on average 27.666666666666668) internal successors, (83), 3 states have internal predecessors, (83), 3 states have call successors, (11), 3 states have call predecessors, (11), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) [2021-11-21 00:52:37,799 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:52:37,799 INFO L93 Difference]: Finished difference Result 6793 states and 10278 transitions. [2021-11-21 00:52:37,800 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 00:52:37,800 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 27.666666666666668) internal successors, (83), 3 states have internal predecessors, (83), 3 states have call successors, (11), 3 states have call predecessors, (11), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) Word has length 124 [2021-11-21 00:52:37,800 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:52:37,839 INFO L225 Difference]: With dead ends: 6793 [2021-11-21 00:52:37,839 INFO L226 Difference]: Without dead ends: 5293 [2021-11-21 00:52:37,850 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 131 GetRequests, 126 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-21 00:52:37,851 INFO L933 BasicCegarLoop]: 3192 mSDtfsCounter, 3392 mSDsluCounter, 34 mSDsCounter, 0 mSdLazyCounter, 246 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3392 SdHoareTripleChecker+Valid, 3221 SdHoareTripleChecker+Invalid, 250 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 246 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-21 00:52:37,851 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3392 Valid, 3221 Invalid, 250 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 246 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-21 00:52:37,859 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5293 states. [2021-11-21 00:52:38,062 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5293 to 5293. [2021-11-21 00:52:38,070 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5293 states, 4585 states have (on average 1.5784078516902944) internal successors, (7237), 4604 states have internal predecessors, (7237), 436 states have call successors, (436), 271 states have call predecessors, (436), 270 states have return successors, (434), 418 states have call predecessors, (434), 434 states have call successors, (434) [2021-11-21 00:52:38,088 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5293 states to 5293 states and 8107 transitions. [2021-11-21 00:52:38,089 INFO L78 Accepts]: Start accepts. Automaton has 5293 states and 8107 transitions. Word has length 124 [2021-11-21 00:52:38,090 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:52:38,090 INFO L470 AbstractCegarLoop]: Abstraction has 5293 states and 8107 transitions. [2021-11-21 00:52:38,091 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 27.666666666666668) internal successors, (83), 3 states have internal predecessors, (83), 3 states have call successors, (11), 3 states have call predecessors, (11), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) [2021-11-21 00:52:38,091 INFO L276 IsEmpty]: Start isEmpty. Operand 5293 states and 8107 transitions. [2021-11-21 00:52:38,104 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2021-11-21 00:52:38,104 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:52:38,105 INFO L514 BasicCegarLoop]: trace histogram [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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:52:38,139 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24f5e808-6330-47ea-9eed-a06f0c801063/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-21 00:52:38,328 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24f5e808-6330-47ea-9eed-a06f0c801063/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:52:38,328 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:52:38,328 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:52:38,329 INFO L85 PathProgramCache]: Analyzing trace with hash 1319795946, now seen corresponding path program 1 times [2021-11-21 00:52:38,329 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:52:38,329 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1300964484] [2021-11-21 00:52:38,329 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:52:38,329 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:52:38,474 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:52:38,543 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 10 proven. 31 refuted. 0 times theorem prover too weak. 39 trivial. 0 not checked. [2021-11-21 00:52:38,543 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:52:38,543 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1300964484] [2021-11-21 00:52:38,544 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1300964484] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:52:38,544 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1015426036] [2021-11-21 00:52:38,544 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:52:38,544 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:52:38,544 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24f5e808-6330-47ea-9eed-a06f0c801063/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:52:38,545 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24f5e808-6330-47ea-9eed-a06f0c801063/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:52:38,566 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24f5e808-6330-47ea-9eed-a06f0c801063/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-21 00:52:38,682 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:52:38,685 INFO L263 TraceCheckSpWp]: Trace formula consists of 646 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-21 00:52:38,688 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:52:38,906 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 59 proven. 0 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-21 00:52:38,906 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 00:52:38,907 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1015426036] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:52:38,907 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-21 00:52:38,907 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2021-11-21 00:52:38,907 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [936663681] [2021-11-21 00:52:38,907 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:52:38,908 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 00:52:38,908 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:52:38,908 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 00:52:38,909 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-21 00:52:38,909 INFO L87 Difference]: Start difference. First operand 5293 states and 8107 transitions. Second operand has 3 states, 3 states have (on average 27.333333333333332) internal successors, (82), 3 states have internal predecessors, (82), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2021-11-21 00:52:39,525 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:52:39,525 INFO L93 Difference]: Finished difference Result 10233 states and 14820 transitions. [2021-11-21 00:52:39,526 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 00:52:39,526 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 27.333333333333332) internal successors, (82), 3 states have internal predecessors, (82), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) Word has length 121 [2021-11-21 00:52:39,526 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:52:39,551 INFO L225 Difference]: With dead ends: 10233 [2021-11-21 00:52:39,551 INFO L226 Difference]: Without dead ends: 6587 [2021-11-21 00:52:39,563 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 128 GetRequests, 123 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-21 00:52:39,564 INFO L933 BasicCegarLoop]: 3199 mSDtfsCounter, 66 mSDsluCounter, 3397 mSDsCounter, 0 mSdLazyCounter, 478 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 66 SdHoareTripleChecker+Valid, 6365 SdHoareTripleChecker+Invalid, 480 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 478 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-21 00:52:39,565 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [66 Valid, 6365 Invalid, 480 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 478 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-21 00:52:39,574 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6587 states. [2021-11-21 00:52:39,792 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6587 to 5669. [2021-11-21 00:52:39,800 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5669 states, 4925 states have (on average 1.5807106598984773) internal successors, (7785), 4945 states have internal predecessors, (7785), 454 states have call successors, (454), 289 states have call predecessors, (454), 288 states have return successors, (452), 435 states have call predecessors, (452), 452 states have call successors, (452) [2021-11-21 00:52:39,819 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5669 states to 5669 states and 8691 transitions. [2021-11-21 00:52:39,821 INFO L78 Accepts]: Start accepts. Automaton has 5669 states and 8691 transitions. Word has length 121 [2021-11-21 00:52:39,821 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:52:39,821 INFO L470 AbstractCegarLoop]: Abstraction has 5669 states and 8691 transitions. [2021-11-21 00:52:39,821 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 27.333333333333332) internal successors, (82), 3 states have internal predecessors, (82), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2021-11-21 00:52:39,822 INFO L276 IsEmpty]: Start isEmpty. Operand 5669 states and 8691 transitions. [2021-11-21 00:52:39,836 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2021-11-21 00:52:39,836 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:52:39,836 INFO L514 BasicCegarLoop]: trace histogram [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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:52:39,874 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24f5e808-6330-47ea-9eed-a06f0c801063/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-21 00:52:40,052 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24f5e808-6330-47ea-9eed-a06f0c801063/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:52:40,052 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:52:40,052 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:52:40,053 INFO L85 PathProgramCache]: Analyzing trace with hash -1653256405, now seen corresponding path program 2 times [2021-11-21 00:52:40,053 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:52:40,053 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [929832497] [2021-11-21 00:52:40,053 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:52:40,053 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:52:40,078 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:52:40,114 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 22 proven. 2 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2021-11-21 00:52:40,115 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:52:40,115 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [929832497] [2021-11-21 00:52:40,115 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [929832497] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:52:40,115 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1336197310] [2021-11-21 00:52:40,115 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 00:52:40,116 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:52:40,116 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24f5e808-6330-47ea-9eed-a06f0c801063/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:52:40,117 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24f5e808-6330-47ea-9eed-a06f0c801063/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:52:40,132 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24f5e808-6330-47ea-9eed-a06f0c801063/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-21 00:52:40,255 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-21 00:52:40,255 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:52:40,258 INFO L263 TraceCheckSpWp]: Trace formula consists of 643 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-21 00:52:40,261 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:52:40,460 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 63 proven. 0 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2021-11-21 00:52:40,460 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 00:52:40,460 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1336197310] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:52:40,460 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-21 00:52:40,461 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [5] total 6 [2021-11-21 00:52:40,461 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1929554194] [2021-11-21 00:52:40,461 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:52:40,461 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 00:52:40,461 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:52:40,462 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 00:52:40,462 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-21 00:52:40,462 INFO L87 Difference]: Start difference. First operand 5669 states and 8691 transitions. Second operand has 3 states, 3 states have (on average 27.333333333333332) internal successors, (82), 3 states have internal predecessors, (82), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2021-11-21 00:52:41,065 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:52:41,065 INFO L93 Difference]: Finished difference Result 9059 states and 13405 transitions. [2021-11-21 00:52:41,066 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 00:52:41,066 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 27.333333333333332) internal successors, (82), 3 states have internal predecessors, (82), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) Word has length 121 [2021-11-21 00:52:41,067 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:52:41,090 INFO L225 Difference]: With dead ends: 9059 [2021-11-21 00:52:41,090 INFO L226 Difference]: Without dead ends: 6999 [2021-11-21 00:52:41,098 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 125 GetRequests, 121 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-21 00:52:41,099 INFO L933 BasicCegarLoop]: 3254 mSDtfsCounter, 75 mSDsluCounter, 3414 mSDsCounter, 0 mSdLazyCounter, 491 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 75 SdHoareTripleChecker+Valid, 6436 SdHoareTripleChecker+Invalid, 491 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 491 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-21 00:52:41,099 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [75 Valid, 6436 Invalid, 491 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 491 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-21 00:52:41,109 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6999 states. [2021-11-21 00:52:41,387 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6999 to 6309. [2021-11-21 00:52:41,395 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 6309 states, 5501 states have (on average 1.580985275404472) internal successors, (8697), 5521 states have internal predecessors, (8697), 486 states have call successors, (486), 321 states have call predecessors, (486), 320 states have return successors, (484), 467 states have call predecessors, (484), 484 states have call successors, (484) [2021-11-21 00:52:41,419 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6309 states to 6309 states and 9667 transitions. [2021-11-21 00:52:41,420 INFO L78 Accepts]: Start accepts. Automaton has 6309 states and 9667 transitions. Word has length 121 [2021-11-21 00:52:41,421 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:52:41,421 INFO L470 AbstractCegarLoop]: Abstraction has 6309 states and 9667 transitions. [2021-11-21 00:52:41,421 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 27.333333333333332) internal successors, (82), 3 states have internal predecessors, (82), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2021-11-21 00:52:41,421 INFO L276 IsEmpty]: Start isEmpty. Operand 6309 states and 9667 transitions. [2021-11-21 00:52:41,440 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2021-11-21 00:52:41,441 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:52:41,441 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, 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] [2021-11-21 00:52:41,483 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24f5e808-6330-47ea-9eed-a06f0c801063/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-21 00:52:41,668 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24f5e808-6330-47ea-9eed-a06f0c801063/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-11-21 00:52:41,668 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:52:41,669 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:52:41,669 INFO L85 PathProgramCache]: Analyzing trace with hash 964266357, now seen corresponding path program 1 times [2021-11-21 00:52:41,669 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:52:41,669 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [326040360] [2021-11-21 00:52:41,669 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:52:41,670 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:52:41,701 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:52:41,760 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 20 proven. 4 refuted. 0 times theorem prover too weak. 58 trivial. 0 not checked. [2021-11-21 00:52:41,760 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:52:41,760 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [326040360] [2021-11-21 00:52:41,761 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [326040360] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:52:41,761 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [198493805] [2021-11-21 00:52:41,761 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:52:41,761 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:52:41,762 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24f5e808-6330-47ea-9eed-a06f0c801063/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:52:41,762 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24f5e808-6330-47ea-9eed-a06f0c801063/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:52:41,787 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24f5e808-6330-47ea-9eed-a06f0c801063/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-21 00:52:41,912 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:52:41,915 INFO L263 TraceCheckSpWp]: Trace formula consists of 640 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-21 00:52:41,918 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:52:42,111 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 65 proven. 0 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2021-11-21 00:52:42,112 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 00:52:42,112 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [198493805] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:52:42,112 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-21 00:52:42,113 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [5] total 6 [2021-11-21 00:52:42,113 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1640933511] [2021-11-21 00:52:42,113 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:52:42,114 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 00:52:42,114 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:52:42,114 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 00:52:42,114 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-21 00:52:42,115 INFO L87 Difference]: Start difference. First operand 6309 states and 9667 transitions. Second operand has 3 states, 3 states have (on average 27.333333333333332) internal successors, (82), 3 states have internal predecessors, (82), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2021-11-21 00:52:42,821 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:52:42,821 INFO L93 Difference]: Finished difference Result 10563 states and 15661 transitions. [2021-11-21 00:52:42,822 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 00:52:42,822 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 27.333333333333332) internal successors, (82), 3 states have internal predecessors, (82), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) Word has length 121 [2021-11-21 00:52:42,822 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:52:42,852 INFO L225 Difference]: With dead ends: 10563 [2021-11-21 00:52:42,852 INFO L226 Difference]: Without dead ends: 8151 [2021-11-21 00:52:42,861 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 125 GetRequests, 121 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-21 00:52:42,862 INFO L933 BasicCegarLoop]: 3264 mSDtfsCounter, 87 mSDsluCounter, 3414 mSDsCounter, 0 mSdLazyCounter, 493 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 87 SdHoareTripleChecker+Valid, 6446 SdHoareTripleChecker+Invalid, 493 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 493 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-21 00:52:42,862 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [87 Valid, 6446 Invalid, 493 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 493 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-21 00:52:42,874 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8151 states. [2021-11-21 00:52:43,139 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8151 to 7237. [2021-11-21 00:52:43,148 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 7237 states, 6333 states have (on average 1.579188378335702) internal successors, (10001), 6353 states have internal predecessors, (10001), 534 states have call successors, (534), 369 states have call predecessors, (534), 368 states have return successors, (532), 515 states have call predecessors, (532), 532 states have call successors, (532) [2021-11-21 00:52:43,174 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7237 states to 7237 states and 11067 transitions. [2021-11-21 00:52:43,175 INFO L78 Accepts]: Start accepts. Automaton has 7237 states and 11067 transitions. Word has length 121 [2021-11-21 00:52:43,175 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:52:43,176 INFO L470 AbstractCegarLoop]: Abstraction has 7237 states and 11067 transitions. [2021-11-21 00:52:43,176 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 27.333333333333332) internal successors, (82), 3 states have internal predecessors, (82), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2021-11-21 00:52:43,176 INFO L276 IsEmpty]: Start isEmpty. Operand 7237 states and 11067 transitions. [2021-11-21 00:52:43,191 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2021-11-21 00:52:43,191 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:52:43,192 INFO L514 BasicCegarLoop]: trace histogram [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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:52:43,230 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24f5e808-6330-47ea-9eed-a06f0c801063/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-21 00:52:43,416 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24f5e808-6330-47ea-9eed-a06f0c801063/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:52:43,416 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:52:43,416 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:52:43,417 INFO L85 PathProgramCache]: Analyzing trace with hash 58205911, now seen corresponding path program 1 times [2021-11-21 00:52:43,417 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:52:43,417 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [163753550] [2021-11-21 00:52:43,417 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:52:43,417 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:52:43,433 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:52:43,477 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 21 proven. 3 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2021-11-21 00:52:43,477 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:52:43,477 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [163753550] [2021-11-21 00:52:43,478 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [163753550] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:52:43,478 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [273930100] [2021-11-21 00:52:43,478 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:52:43,478 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:52:43,478 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24f5e808-6330-47ea-9eed-a06f0c801063/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:52:43,505 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24f5e808-6330-47ea-9eed-a06f0c801063/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:52:43,524 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24f5e808-6330-47ea-9eed-a06f0c801063/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-21 00:52:43,641 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:52:43,645 INFO L263 TraceCheckSpWp]: Trace formula consists of 643 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-21 00:52:43,647 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:52:43,845 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 63 proven. 0 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2021-11-21 00:52:43,846 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 00:52:43,846 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [273930100] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:52:43,846 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-21 00:52:43,846 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [5] total 6 [2021-11-21 00:52:43,846 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [463368476] [2021-11-21 00:52:43,846 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:52:43,847 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 00:52:43,847 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:52:43,847 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 00:52:43,847 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-21 00:52:43,848 INFO L87 Difference]: Start difference. First operand 7237 states and 11067 transitions. Second operand has 3 states, 3 states have (on average 27.333333333333332) internal successors, (82), 3 states have internal predecessors, (82), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2021-11-21 00:52:44,625 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:52:44,625 INFO L93 Difference]: Finished difference Result 12187 states and 18101 transitions. [2021-11-21 00:52:44,626 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 00:52:44,626 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 27.333333333333332) internal successors, (82), 3 states have internal predecessors, (82), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) Word has length 121 [2021-11-21 00:52:44,626 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:52:44,658 INFO L225 Difference]: With dead ends: 12187 [2021-11-21 00:52:44,658 INFO L226 Difference]: Without dead ends: 9323 [2021-11-21 00:52:44,666 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 125 GetRequests, 121 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-21 00:52:44,667 INFO L933 BasicCegarLoop]: 3259 mSDtfsCounter, 81 mSDsluCounter, 3414 mSDsCounter, 0 mSdLazyCounter, 492 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 81 SdHoareTripleChecker+Valid, 6441 SdHoareTripleChecker+Invalid, 492 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 492 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-21 00:52:44,668 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [81 Valid, 6441 Invalid, 492 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 492 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-21 00:52:44,678 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9323 states. [2021-11-21 00:52:45,046 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9323 to 8521. [2021-11-21 00:52:45,057 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 8521 states, 7473 states have (on average 1.5711227084169677) internal successors, (11741), 7493 states have internal predecessors, (11741), 606 states have call successors, (606), 441 states have call predecessors, (606), 440 states have return successors, (604), 587 states have call predecessors, (604), 604 states have call successors, (604) [2021-11-21 00:52:45,083 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8521 states to 8521 states and 12951 transitions. [2021-11-21 00:52:45,085 INFO L78 Accepts]: Start accepts. Automaton has 8521 states and 12951 transitions. Word has length 121 [2021-11-21 00:52:45,085 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:52:45,085 INFO L470 AbstractCegarLoop]: Abstraction has 8521 states and 12951 transitions. [2021-11-21 00:52:45,086 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 27.333333333333332) internal successors, (82), 3 states have internal predecessors, (82), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2021-11-21 00:52:45,086 INFO L276 IsEmpty]: Start isEmpty. Operand 8521 states and 12951 transitions. [2021-11-21 00:52:45,109 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 127 [2021-11-21 00:52:45,109 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:52:45,110 INFO L514 BasicCegarLoop]: trace histogram [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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:52:45,150 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24f5e808-6330-47ea-9eed-a06f0c801063/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-21 00:52:45,324 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24f5e808-6330-47ea-9eed-a06f0c801063/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2021-11-21 00:52:45,324 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:52:45,324 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:52:45,325 INFO L85 PathProgramCache]: Analyzing trace with hash 1395784967, now seen corresponding path program 1 times [2021-11-21 00:52:45,325 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:52:45,325 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [595142220] [2021-11-21 00:52:45,325 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:52:45,325 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:52:45,351 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:52:45,426 INFO L134 CoverageAnalysis]: Checked inductivity of 83 backedges. 14 proven. 32 refuted. 0 times theorem prover too weak. 37 trivial. 0 not checked. [2021-11-21 00:52:45,427 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:52:45,427 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [595142220] [2021-11-21 00:52:45,427 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [595142220] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:52:45,427 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1694188744] [2021-11-21 00:52:45,427 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:52:45,428 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:52:45,428 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24f5e808-6330-47ea-9eed-a06f0c801063/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:52:45,429 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24f5e808-6330-47ea-9eed-a06f0c801063/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:52:45,454 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24f5e808-6330-47ea-9eed-a06f0c801063/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-21 00:52:45,586 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:52:45,589 INFO L263 TraceCheckSpWp]: Trace formula consists of 666 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-21 00:52:45,593 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:52:45,822 INFO L134 CoverageAnalysis]: Checked inductivity of 83 backedges. 78 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-21 00:52:45,823 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 00:52:45,823 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1694188744] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:52:45,823 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-21 00:52:45,823 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2021-11-21 00:52:45,824 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [346111778] [2021-11-21 00:52:45,824 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:52:45,824 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 00:52:45,825 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:52:45,825 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 00:52:45,825 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-21 00:52:45,825 INFO L87 Difference]: Start difference. First operand 8521 states and 12951 transitions. Second operand has 3 states, 3 states have (on average 33.333333333333336) internal successors, (100), 3 states have internal predecessors, (100), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2021-11-21 00:52:46,478 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:52:46,478 INFO L93 Difference]: Finished difference Result 12737 states and 19109 transitions. [2021-11-21 00:52:46,479 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 00:52:46,479 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 33.333333333333336) internal successors, (100), 3 states have internal predecessors, (100), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) Word has length 126 [2021-11-21 00:52:46,479 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:52:46,508 INFO L225 Difference]: With dead ends: 12737 [2021-11-21 00:52:46,509 INFO L226 Difference]: Without dead ends: 8541 [2021-11-21 00:52:46,521 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 133 GetRequests, 128 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-21 00:52:46,523 INFO L933 BasicCegarLoop]: 3270 mSDtfsCounter, 109 mSDsluCounter, 3403 mSDsCounter, 0 mSdLazyCounter, 496 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 109 SdHoareTripleChecker+Valid, 6439 SdHoareTripleChecker+Invalid, 498 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 496 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-21 00:52:46,523 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [109 Valid, 6439 Invalid, 498 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 496 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-21 00:52:46,534 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8541 states. [2021-11-21 00:52:46,907 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8541 to 8409. [2021-11-21 00:52:46,918 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 8409 states, 7361 states have (on average 1.5559027306072544) internal successors, (11453), 7381 states have internal predecessors, (11453), 606 states have call successors, (606), 441 states have call predecessors, (606), 440 states have return successors, (604), 587 states have call predecessors, (604), 604 states have call successors, (604) [2021-11-21 00:52:46,947 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8409 states to 8409 states and 12663 transitions. [2021-11-21 00:52:46,948 INFO L78 Accepts]: Start accepts. Automaton has 8409 states and 12663 transitions. Word has length 126 [2021-11-21 00:52:46,949 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:52:46,949 INFO L470 AbstractCegarLoop]: Abstraction has 8409 states and 12663 transitions. [2021-11-21 00:52:46,949 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 33.333333333333336) internal successors, (100), 3 states have internal predecessors, (100), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2021-11-21 00:52:46,950 INFO L276 IsEmpty]: Start isEmpty. Operand 8409 states and 12663 transitions. [2021-11-21 00:52:46,970 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 127 [2021-11-21 00:52:46,970 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:52:46,971 INFO L514 BasicCegarLoop]: trace histogram [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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:52:47,010 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24f5e808-6330-47ea-9eed-a06f0c801063/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-11-21 00:52:47,196 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24f5e808-6330-47ea-9eed-a06f0c801063/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-11-21 00:52:47,196 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:52:47,196 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:52:47,197 INFO L85 PathProgramCache]: Analyzing trace with hash -1224125145, now seen corresponding path program 1 times [2021-11-21 00:52:47,197 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:52:47,197 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1419873593] [2021-11-21 00:52:47,197 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:52:47,197 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:52:47,217 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:52:47,279 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 14 proven. 30 refuted. 0 times theorem prover too weak. 37 trivial. 0 not checked. [2021-11-21 00:52:47,279 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:52:47,280 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1419873593] [2021-11-21 00:52:47,280 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1419873593] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:52:47,280 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1751884254] [2021-11-21 00:52:47,280 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:52:47,281 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:52:47,281 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24f5e808-6330-47ea-9eed-a06f0c801063/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:52:47,282 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24f5e808-6330-47ea-9eed-a06f0c801063/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:52:47,296 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24f5e808-6330-47ea-9eed-a06f0c801063/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-21 00:52:47,435 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:52:47,438 INFO L263 TraceCheckSpWp]: Trace formula consists of 672 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-21 00:52:47,442 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:52:47,741 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 68 proven. 0 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-21 00:52:47,741 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 00:52:47,741 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1751884254] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:52:47,741 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-21 00:52:47,742 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [6] total 8 [2021-11-21 00:52:47,742 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [21342555] [2021-11-21 00:52:47,742 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:52:47,743 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-21 00:52:47,743 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:52:47,743 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-21 00:52:47,744 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2021-11-21 00:52:47,744 INFO L87 Difference]: Start difference. First operand 8409 states and 12663 transitions. Second operand has 4 states, 4 states have (on average 23.5) internal successors, (94), 4 states have internal predecessors, (94), 2 states have call successors, (11), 2 states have call predecessors, (11), 3 states have return successors, (10), 3 states have call predecessors, (10), 2 states have call successors, (10) [2021-11-21 00:52:48,840 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:52:48,840 INFO L93 Difference]: Finished difference Result 21647 states and 30987 transitions. [2021-11-21 00:52:48,841 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-21 00:52:48,841 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 23.5) internal successors, (94), 4 states have internal predecessors, (94), 2 states have call successors, (11), 2 states have call predecessors, (11), 3 states have return successors, (10), 3 states have call predecessors, (10), 2 states have call successors, (10) Word has length 126 [2021-11-21 00:52:48,842 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:52:48,904 INFO L225 Difference]: With dead ends: 21647 [2021-11-21 00:52:48,904 INFO L226 Difference]: Without dead ends: 14885 [2021-11-21 00:52:48,927 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 135 GetRequests, 128 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=54, Unknown=0, NotChecked=0, Total=72 [2021-11-21 00:52:48,928 INFO L933 BasicCegarLoop]: 3299 mSDtfsCounter, 3401 mSDsluCounter, 3668 mSDsCounter, 0 mSdLazyCounter, 548 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3401 SdHoareTripleChecker+Valid, 6696 SdHoareTripleChecker+Invalid, 551 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 548 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-21 00:52:48,928 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3401 Valid, 6696 Invalid, 551 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 548 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-21 00:52:48,948 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14885 states. [2021-11-21 00:52:49,576 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14885 to 14861. [2021-11-21 00:52:49,593 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14861 states, 12779 states have (on average 1.482353861804523) internal successors, (18943), 12832 states have internal predecessors, (18943), 1187 states have call successors, (1187), 878 states have call predecessors, (1187), 893 states have return successors, (1233), 1151 states have call predecessors, (1233), 1185 states have call successors, (1233) [2021-11-21 00:52:49,631 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14861 states to 14861 states and 21363 transitions. [2021-11-21 00:52:49,633 INFO L78 Accepts]: Start accepts. Automaton has 14861 states and 21363 transitions. Word has length 126 [2021-11-21 00:52:49,634 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:52:49,634 INFO L470 AbstractCegarLoop]: Abstraction has 14861 states and 21363 transitions. [2021-11-21 00:52:49,634 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 23.5) internal successors, (94), 4 states have internal predecessors, (94), 2 states have call successors, (11), 2 states have call predecessors, (11), 3 states have return successors, (10), 3 states have call predecessors, (10), 2 states have call successors, (10) [2021-11-21 00:52:49,634 INFO L276 IsEmpty]: Start isEmpty. Operand 14861 states and 21363 transitions. [2021-11-21 00:52:49,667 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 127 [2021-11-21 00:52:49,667 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:52:49,668 INFO L514 BasicCegarLoop]: trace histogram [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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:52:49,703 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24f5e808-6330-47ea-9eed-a06f0c801063/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-21 00:52:49,896 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24f5e808-6330-47ea-9eed-a06f0c801063/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-11-21 00:52:49,896 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:52:49,896 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:52:49,897 INFO L85 PathProgramCache]: Analyzing trace with hash 670872668, now seen corresponding path program 1 times [2021-11-21 00:52:49,897 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:52:49,897 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [600548721] [2021-11-21 00:52:49,897 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:52:49,897 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:52:49,913 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:52:49,972 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 13 proven. 31 refuted. 0 times theorem prover too weak. 38 trivial. 0 not checked. [2021-11-21 00:52:49,972 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:52:49,972 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [600548721] [2021-11-21 00:52:49,972 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [600548721] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:52:49,972 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1447383679] [2021-11-21 00:52:49,973 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:52:49,973 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:52:49,973 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24f5e808-6330-47ea-9eed-a06f0c801063/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:52:49,974 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24f5e808-6330-47ea-9eed-a06f0c801063/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:52:49,994 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24f5e808-6330-47ea-9eed-a06f0c801063/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-21 00:52:50,113 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:52:50,117 INFO L263 TraceCheckSpWp]: Trace formula consists of 669 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-21 00:52:50,120 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:52:50,433 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 48 proven. 0 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2021-11-21 00:52:50,434 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 00:52:50,434 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1447383679] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:52:50,434 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-21 00:52:50,434 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [6] total 7 [2021-11-21 00:52:50,435 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1608636879] [2021-11-21 00:52:50,435 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:52:50,435 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-21 00:52:50,436 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:52:50,436 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-21 00:52:50,436 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-11-21 00:52:50,436 INFO L87 Difference]: Start difference. First operand 14861 states and 21363 transitions. Second operand has 6 states, 6 states have (on average 13.0) internal successors, (78), 6 states have internal predecessors, (78), 3 states have call successors, (10), 4 states have call predecessors, (10), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-21 00:52:51,615 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:52:51,615 INFO L93 Difference]: Finished difference Result 25294 states and 35496 transitions. [2021-11-21 00:52:51,615 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-21 00:52:51,616 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 13.0) internal successors, (78), 6 states have internal predecessors, (78), 3 states have call successors, (10), 4 states have call predecessors, (10), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 126 [2021-11-21 00:52:51,616 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:52:51,653 INFO L225 Difference]: With dead ends: 25294 [2021-11-21 00:52:51,653 INFO L226 Difference]: Without dead ends: 12080 [2021-11-21 00:52:51,682 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 137 GetRequests, 128 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=40, Invalid=70, Unknown=0, NotChecked=0, Total=110 [2021-11-21 00:52:51,684 INFO L933 BasicCegarLoop]: 3193 mSDtfsCounter, 6940 mSDsluCounter, 6743 mSDsCounter, 0 mSdLazyCounter, 778 mSolverCounterSat, 124 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6953 SdHoareTripleChecker+Valid, 9477 SdHoareTripleChecker+Invalid, 902 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 124 IncrementalHoareTripleChecker+Valid, 778 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-21 00:52:51,684 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [6953 Valid, 9477 Invalid, 902 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [124 Valid, 778 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-21 00:52:51,697 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12080 states. [2021-11-21 00:52:52,251 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12080 to 11822. [2021-11-21 00:52:52,261 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 11822 states, 10223 states have (on average 1.493984153379634) internal successors, (15273), 10267 states have internal predecessors, (15273), 903 states have call successors, (903), 663 states have call predecessors, (903), 694 states have return successors, (933), 892 states have call predecessors, (933), 901 states have call successors, (933) [2021-11-21 00:52:52,291 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11822 states to 11822 states and 17109 transitions. [2021-11-21 00:52:52,293 INFO L78 Accepts]: Start accepts. Automaton has 11822 states and 17109 transitions. Word has length 126 [2021-11-21 00:52:52,293 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:52:52,294 INFO L470 AbstractCegarLoop]: Abstraction has 11822 states and 17109 transitions. [2021-11-21 00:52:52,294 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 13.0) internal successors, (78), 6 states have internal predecessors, (78), 3 states have call successors, (10), 4 states have call predecessors, (10), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-21 00:52:52,294 INFO L276 IsEmpty]: Start isEmpty. Operand 11822 states and 17109 transitions. [2021-11-21 00:52:52,313 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 128 [2021-11-21 00:52:52,313 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:52:52,313 INFO L514 BasicCegarLoop]: trace histogram [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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:52:52,350 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24f5e808-6330-47ea-9eed-a06f0c801063/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-11-21 00:52:52,528 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24f5e808-6330-47ea-9eed-a06f0c801063/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:52:52,528 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:52:52,528 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:52:52,529 INFO L85 PathProgramCache]: Analyzing trace with hash -891370544, now seen corresponding path program 2 times [2021-11-21 00:52:52,529 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:52:52,529 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1550326905] [2021-11-21 00:52:52,529 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:52:52,529 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:52:52,544 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:52:52,598 INFO L134 CoverageAnalysis]: Checked inductivity of 83 backedges. 14 proven. 31 refuted. 0 times theorem prover too weak. 38 trivial. 0 not checked. [2021-11-21 00:52:52,599 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:52:52,599 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1550326905] [2021-11-21 00:52:52,600 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1550326905] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:52:52,600 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1580447210] [2021-11-21 00:52:52,600 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 00:52:52,601 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:52:52,601 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24f5e808-6330-47ea-9eed-a06f0c801063/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:52:52,604 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24f5e808-6330-47ea-9eed-a06f0c801063/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:52:52,624 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24f5e808-6330-47ea-9eed-a06f0c801063/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-11-21 00:52:52,744 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-21 00:52:52,744 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:52:52,747 INFO L263 TraceCheckSpWp]: Trace formula consists of 617 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-21 00:52:52,749 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:52:52,926 INFO L134 CoverageAnalysis]: Checked inductivity of 83 backedges. 61 proven. 0 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-11-21 00:52:52,927 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 00:52:52,927 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1580447210] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:52:52,927 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-21 00:52:52,927 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2021-11-21 00:52:52,928 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1019044950] [2021-11-21 00:52:52,928 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:52:52,928 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 00:52:52,928 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:52:52,929 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 00:52:52,929 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-21 00:52:52,929 INFO L87 Difference]: Start difference. First operand 11822 states and 17109 transitions. Second operand has 3 states, 3 states have (on average 29.0) internal successors, (87), 3 states have internal predecessors, (87), 3 states have call successors, (11), 3 states have call predecessors, (11), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) [2021-11-21 00:52:53,650 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:52:53,650 INFO L93 Difference]: Finished difference Result 15219 states and 21817 transitions. [2021-11-21 00:52:53,651 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 00:52:53,651 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 29.0) internal successors, (87), 3 states have internal predecessors, (87), 3 states have call successors, (11), 3 states have call predecessors, (11), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) Word has length 127 [2021-11-21 00:52:53,651 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:52:53,680 INFO L225 Difference]: With dead ends: 15219 [2021-11-21 00:52:53,680 INFO L226 Difference]: Without dead ends: 11542 [2021-11-21 00:52:53,691 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 134 GetRequests, 129 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-21 00:52:53,692 INFO L933 BasicCegarLoop]: 3193 mSDtfsCounter, 28 mSDsluCounter, 3405 mSDsCounter, 0 mSdLazyCounter, 481 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 28 SdHoareTripleChecker+Valid, 6366 SdHoareTripleChecker+Invalid, 481 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 481 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-21 00:52:53,692 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [28 Valid, 6366 Invalid, 481 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 481 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-21 00:52:53,704 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11542 states. [2021-11-21 00:52:54,109 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11542 to 11102. [2021-11-21 00:52:54,120 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 11102 states, 9599 states have (on average 1.5102614855714136) internal successors, (14497), 9619 states have internal predecessors, (14497), 871 states have call successors, (871), 631 states have call predecessors, (871), 630 states have return successors, (869), 852 states have call predecessors, (869), 869 states have call successors, (869) [2021-11-21 00:52:54,148 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11102 states to 11102 states and 16237 transitions. [2021-11-21 00:52:54,149 INFO L78 Accepts]: Start accepts. Automaton has 11102 states and 16237 transitions. Word has length 127 [2021-11-21 00:52:54,150 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:52:54,150 INFO L470 AbstractCegarLoop]: Abstraction has 11102 states and 16237 transitions. [2021-11-21 00:52:54,150 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 29.0) internal successors, (87), 3 states have internal predecessors, (87), 3 states have call successors, (11), 3 states have call predecessors, (11), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) [2021-11-21 00:52:54,150 INFO L276 IsEmpty]: Start isEmpty. Operand 11102 states and 16237 transitions. [2021-11-21 00:52:54,167 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 128 [2021-11-21 00:52:54,167 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:52:54,168 INFO L514 BasicCegarLoop]: trace histogram [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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:52:54,208 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24f5e808-6330-47ea-9eed-a06f0c801063/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-11-21 00:52:54,384 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24f5e808-6330-47ea-9eed-a06f0c801063/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-11-21 00:52:54,384 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:52:54,384 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:52:54,385 INFO L85 PathProgramCache]: Analyzing trace with hash 846653635, now seen corresponding path program 1 times [2021-11-21 00:52:54,385 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:52:54,385 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1392275189] [2021-11-21 00:52:54,385 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:52:54,385 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:52:54,403 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:52:54,470 INFO L134 CoverageAnalysis]: Checked inductivity of 83 backedges. 15 proven. 31 refuted. 0 times theorem prover too weak. 37 trivial. 0 not checked. [2021-11-21 00:52:54,470 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:52:54,470 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1392275189] [2021-11-21 00:52:54,470 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1392275189] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:52:54,471 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [925080219] [2021-11-21 00:52:54,471 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:52:54,471 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:52:54,471 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24f5e808-6330-47ea-9eed-a06f0c801063/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:52:54,472 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24f5e808-6330-47ea-9eed-a06f0c801063/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:52:54,491 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24f5e808-6330-47ea-9eed-a06f0c801063/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-11-21 00:52:54,607 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:52:54,610 INFO L263 TraceCheckSpWp]: Trace formula consists of 676 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-21 00:52:54,613 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:52:54,916 INFO L134 CoverageAnalysis]: Checked inductivity of 83 backedges. 50 proven. 0 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2021-11-21 00:52:54,916 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 00:52:54,916 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [925080219] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:52:54,916 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-21 00:52:54,917 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [6] total 7 [2021-11-21 00:52:54,917 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1856737724] [2021-11-21 00:52:54,917 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:52:54,918 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-21 00:52:54,918 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:52:54,918 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-21 00:52:54,918 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-11-21 00:52:54,919 INFO L87 Difference]: Start difference. First operand 11102 states and 16237 transitions. Second operand has 6 states, 6 states have (on average 13.333333333333334) internal successors, (80), 6 states have internal predecessors, (80), 3 states have call successors, (10), 4 states have call predecessors, (10), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-21 00:52:56,022 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:52:56,022 INFO L93 Difference]: Finished difference Result 23938 states and 33719 transitions. [2021-11-21 00:52:56,022 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-21 00:52:56,023 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 13.333333333333334) internal successors, (80), 6 states have internal predecessors, (80), 3 states have call successors, (10), 4 states have call predecessors, (10), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 127 [2021-11-21 00:52:56,023 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:52:56,060 INFO L225 Difference]: With dead ends: 23938 [2021-11-21 00:52:56,060 INFO L226 Difference]: Without dead ends: 14528 [2021-11-21 00:52:56,079 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 138 GetRequests, 129 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=40, Invalid=70, Unknown=0, NotChecked=0, Total=110 [2021-11-21 00:52:56,080 INFO L933 BasicCegarLoop]: 3181 mSDtfsCounter, 6986 mSDsluCounter, 6720 mSDsCounter, 0 mSdLazyCounter, 761 mSolverCounterSat, 157 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6999 SdHoareTripleChecker+Valid, 9445 SdHoareTripleChecker+Invalid, 918 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 157 IncrementalHoareTripleChecker+Valid, 761 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-21 00:52:56,080 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [6999 Valid, 9445 Invalid, 918 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [157 Valid, 761 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-21 00:52:56,095 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14528 states. [2021-11-21 00:52:56,685 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14528 to 14524. [2021-11-21 00:52:56,699 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14524 states, 12405 states have (on average 1.4615880693268843) internal successors, (18131), 12433 states have internal predecessors, (18131), 1231 states have call successors, (1231), 887 states have call predecessors, (1231), 886 states have return successors, (1229), 1204 states have call predecessors, (1229), 1229 states have call successors, (1229) [2021-11-21 00:52:56,736 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14524 states to 14524 states and 20591 transitions. [2021-11-21 00:52:56,738 INFO L78 Accepts]: Start accepts. Automaton has 14524 states and 20591 transitions. Word has length 127 [2021-11-21 00:52:56,738 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:52:56,739 INFO L470 AbstractCegarLoop]: Abstraction has 14524 states and 20591 transitions. [2021-11-21 00:52:56,739 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 13.333333333333334) internal successors, (80), 6 states have internal predecessors, (80), 3 states have call successors, (10), 4 states have call predecessors, (10), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-21 00:52:56,739 INFO L276 IsEmpty]: Start isEmpty. Operand 14524 states and 20591 transitions. [2021-11-21 00:52:56,759 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2021-11-21 00:52:56,759 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:52:56,760 INFO L514 BasicCegarLoop]: trace histogram [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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:52:56,795 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24f5e808-6330-47ea-9eed-a06f0c801063/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-11-21 00:52:56,976 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24f5e808-6330-47ea-9eed-a06f0c801063/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-11-21 00:52:56,976 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:52:56,976 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:52:56,976 INFO L85 PathProgramCache]: Analyzing trace with hash 1547163241, now seen corresponding path program 1 times [2021-11-21 00:52:56,977 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:52:56,977 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [579711817] [2021-11-21 00:52:56,977 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:52:56,977 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:52:56,991 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:52:57,046 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 17 proven. 31 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-11-21 00:52:57,047 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:52:57,047 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [579711817] [2021-11-21 00:52:57,047 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [579711817] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:52:57,047 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2131801905] [2021-11-21 00:52:57,048 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:52:57,048 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:52:57,048 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24f5e808-6330-47ea-9eed-a06f0c801063/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:52:57,049 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24f5e808-6330-47ea-9eed-a06f0c801063/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:52:57,079 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24f5e808-6330-47ea-9eed-a06f0c801063/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-11-21 00:52:57,200 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:52:57,203 INFO L263 TraceCheckSpWp]: Trace formula consists of 690 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-21 00:52:57,206 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:52:57,439 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 52 proven. 0 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-21 00:52:57,440 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 00:52:57,440 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2131801905] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:52:57,442 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-21 00:52:57,442 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [6] total 7 [2021-11-21 00:52:57,443 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [966968323] [2021-11-21 00:52:57,443 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:52:57,443 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-21 00:52:57,444 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:52:57,444 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-21 00:52:57,444 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-11-21 00:52:57,444 INFO L87 Difference]: Start difference. First operand 14524 states and 20591 transitions. Second operand has 6 states, 6 states have (on average 13.833333333333334) internal successors, (83), 6 states have internal predecessors, (83), 3 states have call successors, (10), 4 states have call predecessors, (10), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-21 00:52:58,650 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:52:58,651 INFO L93 Difference]: Finished difference Result 32104 states and 44079 transitions. [2021-11-21 00:52:58,651 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-21 00:52:58,651 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 13.833333333333334) internal successors, (83), 6 states have internal predecessors, (83), 3 states have call successors, (10), 4 states have call predecessors, (10), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 129 [2021-11-21 00:52:58,651 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:52:58,696 INFO L225 Difference]: With dead ends: 32104 [2021-11-21 00:52:58,696 INFO L226 Difference]: Without dead ends: 19272 [2021-11-21 00:52:58,719 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 131 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=40, Invalid=70, Unknown=0, NotChecked=0, Total=110 [2021-11-21 00:52:58,719 INFO L933 BasicCegarLoop]: 3187 mSDtfsCounter, 3638 mSDsluCounter, 6779 mSDsCounter, 0 mSdLazyCounter, 787 mSolverCounterSat, 128 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3651 SdHoareTripleChecker+Valid, 9498 SdHoareTripleChecker+Invalid, 915 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 128 IncrementalHoareTripleChecker+Valid, 787 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-21 00:52:58,720 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3651 Valid, 9498 Invalid, 915 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [128 Valid, 787 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-21 00:52:58,740 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19272 states. [2021-11-21 00:52:59,442 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19272 to 19268. [2021-11-21 00:52:59,457 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19268 states, 16271 states have (on average 1.4158318480732592) internal successors, (23037), 16311 states have internal predecessors, (23037), 1745 states have call successors, (1745), 1251 states have call predecessors, (1745), 1250 states have return successors, (1743), 1706 states have call predecessors, (1743), 1743 states have call successors, (1743) [2021-11-21 00:52:59,499 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19268 states to 19268 states and 26525 transitions. [2021-11-21 00:52:59,502 INFO L78 Accepts]: Start accepts. Automaton has 19268 states and 26525 transitions. Word has length 129 [2021-11-21 00:52:59,502 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:52:59,503 INFO L470 AbstractCegarLoop]: Abstraction has 19268 states and 26525 transitions. [2021-11-21 00:52:59,503 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 13.833333333333334) internal successors, (83), 6 states have internal predecessors, (83), 3 states have call successors, (10), 4 states have call predecessors, (10), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-21 00:52:59,503 INFO L276 IsEmpty]: Start isEmpty. Operand 19268 states and 26525 transitions. [2021-11-21 00:52:59,531 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2021-11-21 00:52:59,531 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:52:59,531 INFO L514 BasicCegarLoop]: trace histogram [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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:52:59,569 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24f5e808-6330-47ea-9eed-a06f0c801063/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2021-11-21 00:52:59,760 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24f5e808-6330-47ea-9eed-a06f0c801063/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-11-21 00:52:59,760 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:52:59,760 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:52:59,760 INFO L85 PathProgramCache]: Analyzing trace with hash -321122430, now seen corresponding path program 1 times [2021-11-21 00:52:59,761 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:52:59,761 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1990098572] [2021-11-21 00:52:59,761 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:52:59,761 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:52:59,776 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:52:59,827 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 21 proven. 31 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-21 00:52:59,828 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:52:59,828 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1990098572] [2021-11-21 00:52:59,828 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1990098572] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:52:59,828 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1832276323] [2021-11-21 00:52:59,829 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:52:59,829 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:52:59,829 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24f5e808-6330-47ea-9eed-a06f0c801063/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:52:59,830 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24f5e808-6330-47ea-9eed-a06f0c801063/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:52:59,862 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24f5e808-6330-47ea-9eed-a06f0c801063/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2021-11-21 00:52:59,986 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:52:59,989 INFO L263 TraceCheckSpWp]: Trace formula consists of 690 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-21 00:52:59,992 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:53:00,228 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 56 proven. 0 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-21 00:53:00,228 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 00:53:00,228 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1832276323] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:53:00,228 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-21 00:53:00,229 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [6] total 7 [2021-11-21 00:53:00,229 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1534237] [2021-11-21 00:53:00,229 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:53:00,231 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-21 00:53:00,232 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:53:00,233 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-21 00:53:00,233 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-11-21 00:53:00,233 INFO L87 Difference]: Start difference. First operand 19268 states and 26525 transitions. Second operand has 6 states, 5 states have (on average 17.2) internal successors, (86), 6 states have internal predecessors, (86), 3 states have call successors, (10), 4 states have call predecessors, (10), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-21 00:53:01,901 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:53:01,901 INFO L93 Difference]: Finished difference Result 43593 states and 58531 transitions. [2021-11-21 00:53:01,901 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-21 00:53:01,901 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 17.2) internal successors, (86), 6 states have internal predecessors, (86), 3 states have call successors, (10), 4 states have call predecessors, (10), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 129 [2021-11-21 00:53:01,901 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:53:01,948 INFO L225 Difference]: With dead ends: 43593 [2021-11-21 00:53:01,948 INFO L226 Difference]: Without dead ends: 26017 [2021-11-21 00:53:01,968 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 131 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=40, Invalid=70, Unknown=0, NotChecked=0, Total=110 [2021-11-21 00:53:01,969 INFO L933 BasicCegarLoop]: 3187 mSDtfsCounter, 3618 mSDsluCounter, 6787 mSDsCounter, 0 mSdLazyCounter, 804 mSolverCounterSat, 109 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3631 SdHoareTripleChecker+Valid, 9505 SdHoareTripleChecker+Invalid, 913 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 109 IncrementalHoareTripleChecker+Valid, 804 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-21 00:53:01,969 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3631 Valid, 9505 Invalid, 913 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [109 Valid, 804 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-21 00:53:01,991 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26017 states. [2021-11-21 00:53:03,414 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26017 to 26013. [2021-11-21 00:53:03,429 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26013 states, 21764 states have (on average 1.3780095570667157) internal successors, (29991), 21822 states have internal predecessors, (29991), 2479 states have call successors, (2479), 1769 states have call predecessors, (2479), 1768 states have return successors, (2477), 2422 states have call predecessors, (2477), 2477 states have call successors, (2477) [2021-11-21 00:53:03,492 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26013 states to 26013 states and 34947 transitions. [2021-11-21 00:53:03,495 INFO L78 Accepts]: Start accepts. Automaton has 26013 states and 34947 transitions. Word has length 129 [2021-11-21 00:53:03,495 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:53:03,495 INFO L470 AbstractCegarLoop]: Abstraction has 26013 states and 34947 transitions. [2021-11-21 00:53:03,496 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 17.2) internal successors, (86), 6 states have internal predecessors, (86), 3 states have call successors, (10), 4 states have call predecessors, (10), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-21 00:53:03,496 INFO L276 IsEmpty]: Start isEmpty. Operand 26013 states and 34947 transitions. [2021-11-21 00:53:03,538 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 132 [2021-11-21 00:53:03,538 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:53:03,539 INFO L514 BasicCegarLoop]: trace histogram [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] [2021-11-21 00:53:03,564 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24f5e808-6330-47ea-9eed-a06f0c801063/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2021-11-21 00:53:03,744 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24f5e808-6330-47ea-9eed-a06f0c801063/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:53:03,745 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:53:03,745 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:53:03,745 INFO L85 PathProgramCache]: Analyzing trace with hash -1975347389, now seen corresponding path program 1 times [2021-11-21 00:53:03,745 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:53:03,745 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1847455515] [2021-11-21 00:53:03,746 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:53:03,746 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:53:03,771 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:53:03,821 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 37 proven. 13 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2021-11-21 00:53:03,821 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:53:03,822 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1847455515] [2021-11-21 00:53:03,822 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1847455515] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:53:03,822 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2105642851] [2021-11-21 00:53:03,822 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:53:03,822 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:53:03,823 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24f5e808-6330-47ea-9eed-a06f0c801063/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:53:03,824 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24f5e808-6330-47ea-9eed-a06f0c801063/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:53:03,841 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24f5e808-6330-47ea-9eed-a06f0c801063/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2021-11-21 00:53:03,991 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:53:03,994 INFO L263 TraceCheckSpWp]: Trace formula consists of 704 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-21 00:53:03,997 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:53:04,233 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 73 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-21 00:53:04,233 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 00:53:04,233 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2105642851] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:53:04,233 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-21 00:53:04,234 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 6 [2021-11-21 00:53:04,234 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [817790677] [2021-11-21 00:53:04,234 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:53:04,234 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 00:53:04,234 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:53:04,235 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 00:53:04,235 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-21 00:53:04,235 INFO L87 Difference]: Start difference. First operand 26013 states and 34947 transitions. Second operand has 3 states, 3 states have (on average 33.666666666666664) internal successors, (101), 3 states have internal predecessors, (101), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2021-11-21 00:53:05,639 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:53:05,639 INFO L93 Difference]: Finished difference Result 46711 states and 62172 transitions. [2021-11-21 00:53:05,639 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 00:53:05,640 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 33.666666666666664) internal successors, (101), 3 states have internal predecessors, (101), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) Word has length 131 [2021-11-21 00:53:05,640 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:53:05,704 INFO L225 Difference]: With dead ends: 46711 [2021-11-21 00:53:05,704 INFO L226 Difference]: Without dead ends: 29571 [2021-11-21 00:53:05,726 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 137 GetRequests, 133 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-21 00:53:05,727 INFO L933 BasicCegarLoop]: 3195 mSDtfsCounter, 3364 mSDsluCounter, 41 mSDsCounter, 0 mSdLazyCounter, 252 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3364 SdHoareTripleChecker+Valid, 3231 SdHoareTripleChecker+Invalid, 256 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 252 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 00:53:05,727 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3364 Valid, 3231 Invalid, 256 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 252 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-21 00:53:05,752 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29571 states. [2021-11-21 00:53:07,156 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29571 to 29303. [2021-11-21 00:53:07,171 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29303 states, 24815 states have (on average 1.349304855933911) internal successors, (33483), 24873 states have internal predecessors, (33483), 2517 states have call successors, (2517), 1970 states have call predecessors, (2517), 1969 states have return successors, (2687), 2460 states have call predecessors, (2687), 2515 states have call successors, (2687) [2021-11-21 00:53:07,226 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29303 states to 29303 states and 38687 transitions. [2021-11-21 00:53:07,229 INFO L78 Accepts]: Start accepts. Automaton has 29303 states and 38687 transitions. Word has length 131 [2021-11-21 00:53:07,230 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:53:07,230 INFO L470 AbstractCegarLoop]: Abstraction has 29303 states and 38687 transitions. [2021-11-21 00:53:07,230 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 33.666666666666664) internal successors, (101), 3 states have internal predecessors, (101), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2021-11-21 00:53:07,230 INFO L276 IsEmpty]: Start isEmpty. Operand 29303 states and 38687 transitions. [2021-11-21 00:53:07,256 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 134 [2021-11-21 00:53:07,256 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:53:07,257 INFO L514 BasicCegarLoop]: trace histogram [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] [2021-11-21 00:53:07,279 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24f5e808-6330-47ea-9eed-a06f0c801063/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2021-11-21 00:53:07,457 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24f5e808-6330-47ea-9eed-a06f0c801063/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:53:07,457 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:53:07,458 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:53:07,458 INFO L85 PathProgramCache]: Analyzing trace with hash 503275175, now seen corresponding path program 1 times [2021-11-21 00:53:07,458 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:53:07,458 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1197628456] [2021-11-21 00:53:07,458 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:53:07,458 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:53:07,477 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:53:07,524 INFO L134 CoverageAnalysis]: Checked inductivity of 88 backedges. 46 proven. 20 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-11-21 00:53:07,524 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:53:07,525 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1197628456] [2021-11-21 00:53:07,525 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1197628456] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:53:07,525 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1408589319] [2021-11-21 00:53:07,525 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:53:07,525 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:53:07,526 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24f5e808-6330-47ea-9eed-a06f0c801063/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:53:07,526 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24f5e808-6330-47ea-9eed-a06f0c801063/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:53:07,546 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24f5e808-6330-47ea-9eed-a06f0c801063/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2021-11-21 00:53:07,663 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:53:07,665 INFO L263 TraceCheckSpWp]: Trace formula consists of 702 conjuncts, 22 conjunts are in the unsatisfiable core [2021-11-21 00:53:07,667 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:53:07,931 INFO L134 CoverageAnalysis]: Checked inductivity of 88 backedges. 88 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:53:07,931 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 00:53:07,931 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1408589319] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:53:07,932 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-21 00:53:07,932 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [5] total 6 [2021-11-21 00:53:07,932 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1203575247] [2021-11-21 00:53:07,932 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:53:07,933 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-21 00:53:07,933 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:53:07,933 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-21 00:53:07,933 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-21 00:53:07,934 INFO L87 Difference]: Start difference. First operand 29303 states and 38687 transitions. Second operand has 6 states, 6 states have (on average 18.333333333333332) internal successors, (110), 6 states have internal predecessors, (110), 5 states have call successors, (12), 5 states have call predecessors, (12), 5 states have return successors, (11), 5 states have call predecessors, (11), 5 states have call successors, (11) [2021-11-21 00:53:10,585 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:53:10,585 INFO L93 Difference]: Finished difference Result 56407 states and 73747 transitions. [2021-11-21 00:53:10,585 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-21 00:53:10,585 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 18.333333333333332) internal successors, (110), 6 states have internal predecessors, (110), 5 states have call successors, (12), 5 states have call predecessors, (12), 5 states have return successors, (11), 5 states have call predecessors, (11), 5 states have call successors, (11) Word has length 133 [2021-11-21 00:53:10,586 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:53:10,665 INFO L225 Difference]: With dead ends: 56407 [2021-11-21 00:53:10,665 INFO L226 Difference]: Without dead ends: 37077 [2021-11-21 00:53:10,686 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 149 GetRequests, 140 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=41, Invalid=69, Unknown=0, NotChecked=0, Total=110 [2021-11-21 00:53:10,687 INFO L933 BasicCegarLoop]: 3265 mSDtfsCounter, 235 mSDsluCounter, 10100 mSDsCounter, 0 mSdLazyCounter, 1085 mSolverCounterSat, 62 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 251 SdHoareTripleChecker+Valid, 12679 SdHoareTripleChecker+Invalid, 1147 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 62 IncrementalHoareTripleChecker+Valid, 1085 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-21 00:53:10,687 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [251 Valid, 12679 Invalid, 1147 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [62 Valid, 1085 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-21 00:53:10,713 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37077 states. [2021-11-21 00:53:12,522 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37077 to 34659. [2021-11-21 00:53:12,543 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34659 states, 29185 states have (on average 1.3298954942607504) internal successors, (38813), 29207 states have internal predecessors, (38813), 3123 states have call successors, (3123), 2414 states have call predecessors, (3123), 2349 states have return successors, (3383), 3038 states have call predecessors, (3383), 3121 states have call successors, (3383) [2021-11-21 00:53:12,609 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34659 states to 34659 states and 45319 transitions. [2021-11-21 00:53:12,613 INFO L78 Accepts]: Start accepts. Automaton has 34659 states and 45319 transitions. Word has length 133 [2021-11-21 00:53:12,613 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:53:12,614 INFO L470 AbstractCegarLoop]: Abstraction has 34659 states and 45319 transitions. [2021-11-21 00:53:12,614 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 18.333333333333332) internal successors, (110), 6 states have internal predecessors, (110), 5 states have call successors, (12), 5 states have call predecessors, (12), 5 states have return successors, (11), 5 states have call predecessors, (11), 5 states have call successors, (11) [2021-11-21 00:53:12,614 INFO L276 IsEmpty]: Start isEmpty. Operand 34659 states and 45319 transitions. [2021-11-21 00:53:12,643 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 132 [2021-11-21 00:53:12,643 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:53:12,643 INFO L514 BasicCegarLoop]: trace histogram [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] [2021-11-21 00:53:12,664 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24f5e808-6330-47ea-9eed-a06f0c801063/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Ended with exit code 0 [2021-11-21 00:53:12,848 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24f5e808-6330-47ea-9eed-a06f0c801063/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:53:12,848 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:53:12,848 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:53:12,849 INFO L85 PathProgramCache]: Analyzing trace with hash -2055061792, now seen corresponding path program 1 times [2021-11-21 00:53:12,849 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:53:12,849 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1509050929] [2021-11-21 00:53:12,849 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:53:12,849 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:53:12,867 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:53:12,916 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 41 proven. 15 refuted. 0 times theorem prover too weak. 29 trivial. 0 not checked. [2021-11-21 00:53:12,916 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:53:12,917 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1509050929] [2021-11-21 00:53:12,917 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1509050929] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:53:12,917 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1438260122] [2021-11-21 00:53:12,917 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:53:12,917 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:53:12,918 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24f5e808-6330-47ea-9eed-a06f0c801063/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:53:12,932 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24f5e808-6330-47ea-9eed-a06f0c801063/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:53:12,934 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24f5e808-6330-47ea-9eed-a06f0c801063/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2021-11-21 00:53:13,068 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:53:13,071 INFO L263 TraceCheckSpWp]: Trace formula consists of 704 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-21 00:53:13,074 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:53:13,503 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 67 proven. 0 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-11-21 00:53:13,504 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 00:53:13,504 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1438260122] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:53:13,504 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-21 00:53:13,504 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 6 [2021-11-21 00:53:13,505 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1258643433] [2021-11-21 00:53:13,505 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:53:13,505 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 00:53:13,505 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:53:13,506 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 00:53:13,506 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-21 00:53:13,506 INFO L87 Difference]: Start difference. First operand 34659 states and 45319 transitions. Second operand has 3 states, 3 states have (on average 31.666666666666668) internal successors, (95), 3 states have internal predecessors, (95), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2021-11-21 00:53:15,646 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:53:15,647 INFO L93 Difference]: Finished difference Result 62247 states and 81130 transitions. [2021-11-21 00:53:15,649 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 00:53:15,649 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 31.666666666666668) internal successors, (95), 3 states have internal predecessors, (95), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) Word has length 131 [2021-11-21 00:53:15,650 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:53:15,738 INFO L225 Difference]: With dead ends: 62247 [2021-11-21 00:53:15,738 INFO L226 Difference]: Without dead ends: 39209 [2021-11-21 00:53:15,767 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 137 GetRequests, 133 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-21 00:53:15,768 INFO L933 BasicCegarLoop]: 3201 mSDtfsCounter, 3370 mSDsluCounter, 41 mSDsCounter, 0 mSdLazyCounter, 252 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3370 SdHoareTripleChecker+Valid, 3237 SdHoareTripleChecker+Invalid, 256 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 252 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-21 00:53:15,769 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3370 Valid, 3237 Invalid, 256 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 252 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-21 00:53:15,800 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39209 states. [2021-11-21 00:53:17,786 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39209 to 38445. [2021-11-21 00:53:17,810 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38445 states, 32695 states have (on average 1.3071417647958403) internal successors, (42737), 32771 states have internal predecessors, (42737), 3159 states have call successors, (3159), 2594 states have call predecessors, (3159), 2589 states have return successors, (3619), 3080 states have call predecessors, (3619), 3157 states have call successors, (3619) [2021-11-21 00:53:17,906 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38445 states to 38445 states and 49515 transitions. [2021-11-21 00:53:17,910 INFO L78 Accepts]: Start accepts. Automaton has 38445 states and 49515 transitions. Word has length 131 [2021-11-21 00:53:17,911 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:53:17,911 INFO L470 AbstractCegarLoop]: Abstraction has 38445 states and 49515 transitions. [2021-11-21 00:53:17,911 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 31.666666666666668) internal successors, (95), 3 states have internal predecessors, (95), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2021-11-21 00:53:17,911 INFO L276 IsEmpty]: Start isEmpty. Operand 38445 states and 49515 transitions. [2021-11-21 00:53:17,944 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 129 [2021-11-21 00:53:17,944 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:53:17,944 INFO L514 BasicCegarLoop]: trace histogram [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] [2021-11-21 00:53:17,966 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24f5e808-6330-47ea-9eed-a06f0c801063/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Ended with exit code 0 [2021-11-21 00:53:18,146 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24f5e808-6330-47ea-9eed-a06f0c801063/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2021-11-21 00:53:18,146 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:53:18,146 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:53:18,146 INFO L85 PathProgramCache]: Analyzing trace with hash -1093845389, now seen corresponding path program 1 times [2021-11-21 00:53:18,146 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:53:18,147 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2114822581] [2021-11-21 00:53:18,309 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:53:18,310 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:53:18,332 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:53:18,372 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 26 proven. 1 refuted. 0 times theorem prover too weak. 58 trivial. 0 not checked. [2021-11-21 00:53:18,372 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:53:18,372 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2114822581] [2021-11-21 00:53:18,372 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2114822581] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:53:18,372 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [675653332] [2021-11-21 00:53:18,373 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:53:18,373 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:53:18,373 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24f5e808-6330-47ea-9eed-a06f0c801063/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:53:18,376 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24f5e808-6330-47ea-9eed-a06f0c801063/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:53:18,403 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24f5e808-6330-47ea-9eed-a06f0c801063/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2021-11-21 00:53:18,522 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:53:18,525 INFO L263 TraceCheckSpWp]: Trace formula consists of 684 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-21 00:53:18,528 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:53:18,739 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 68 proven. 0 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2021-11-21 00:53:18,739 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 00:53:18,739 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [675653332] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:53:18,739 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-21 00:53:18,740 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [5] total 6 [2021-11-21 00:53:18,740 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [187367476] [2021-11-21 00:53:18,740 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:53:18,740 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 00:53:18,740 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:53:18,741 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 00:53:18,741 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-21 00:53:18,741 INFO L87 Difference]: Start difference. First operand 38445 states and 49515 transitions. Second operand has 3 states, 3 states have (on average 29.666666666666668) internal successors, (89), 3 states have internal predecessors, (89), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2021-11-21 00:53:20,957 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:53:20,957 INFO L93 Difference]: Finished difference Result 69865 states and 89801 transitions. [2021-11-21 00:53:20,958 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 00:53:20,958 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 29.666666666666668) internal successors, (89), 3 states have internal predecessors, (89), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) Word has length 128 [2021-11-21 00:53:20,958 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:53:21,089 INFO L225 Difference]: With dead ends: 69865 [2021-11-21 00:53:21,089 INFO L226 Difference]: Without dead ends: 45725 [2021-11-21 00:53:21,115 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 132 GetRequests, 128 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-21 00:53:21,116 INFO L933 BasicCegarLoop]: 3246 mSDtfsCounter, 65 mSDsluCounter, 3413 mSDsCounter, 0 mSdLazyCounter, 490 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 65 SdHoareTripleChecker+Valid, 6427 SdHoareTripleChecker+Invalid, 490 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 490 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-21 00:53:21,117 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [65 Valid, 6427 Invalid, 490 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 490 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-21 00:53:21,150 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45725 states. [2021-11-21 00:53:23,446 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45725 to 42505. [2021-11-21 00:53:23,465 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42505 states, 36243 states have (on average 1.3176889330353447) internal successors, (47757), 36319 states have internal predecessors, (47757), 3415 states have call successors, (3415), 2850 states have call predecessors, (3415), 2845 states have return successors, (3875), 3336 states have call predecessors, (3875), 3413 states have call successors, (3875) [2021-11-21 00:53:23,538 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42505 states to 42505 states and 55047 transitions. [2021-11-21 00:53:23,542 INFO L78 Accepts]: Start accepts. Automaton has 42505 states and 55047 transitions. Word has length 128 [2021-11-21 00:53:23,542 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:53:23,543 INFO L470 AbstractCegarLoop]: Abstraction has 42505 states and 55047 transitions. [2021-11-21 00:53:23,543 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 29.666666666666668) internal successors, (89), 3 states have internal predecessors, (89), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2021-11-21 00:53:23,543 INFO L276 IsEmpty]: Start isEmpty. Operand 42505 states and 55047 transitions. [2021-11-21 00:53:23,572 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 133 [2021-11-21 00:53:23,572 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:53:23,573 INFO L514 BasicCegarLoop]: trace histogram [5, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:53:23,594 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24f5e808-6330-47ea-9eed-a06f0c801063/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2021-11-21 00:53:23,773 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24f5e808-6330-47ea-9eed-a06f0c801063/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:53:23,773 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:53:23,774 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:53:23,774 INFO L85 PathProgramCache]: Analyzing trace with hash -1722228535, now seen corresponding path program 1 times [2021-11-21 00:53:23,774 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:53:23,774 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1693569339] [2021-11-21 00:53:23,774 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:53:23,774 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:53:23,791 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:53:23,851 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 17 proven. 32 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2021-11-21 00:53:23,851 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:53:23,851 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1693569339] [2021-11-21 00:53:23,851 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1693569339] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:53:23,851 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [855869914] [2021-11-21 00:53:23,852 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:53:23,852 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:53:23,852 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24f5e808-6330-47ea-9eed-a06f0c801063/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:53:23,853 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24f5e808-6330-47ea-9eed-a06f0c801063/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:53:23,879 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_24f5e808-6330-47ea-9eed-a06f0c801063/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2021-11-21 00:53:23,997 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:53:23,999 INFO L263 TraceCheckSpWp]: Trace formula consists of 756 conjuncts, 15 conjunts are in the unsatisfiable core [2021-11-21 00:53:24,002 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:53:24,280 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 68 proven. 17 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-21 00:53:24,280 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:53:24,948 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 17 proven. 3 refuted. 0 times theorem prover too weak. 71 trivial. 0 not checked. [2021-11-21 00:53:24,948 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [855869914] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:53:24,948 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2140595853] [2021-11-21 00:53:24,981 INFO L159 IcfgInterpreter]: Started Sifa with 74 locations of interest [2021-11-21 00:53:24,981 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:53:24,996 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:53:25,005 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:53:25,007 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs