./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/combinations/Problem05_label46+token_ring.13.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_ba3beba8-dfc9-455c-9ccf-228b6f50d1fe/bin/utaipan-TEXQjIfE4P/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ba3beba8-dfc9-455c-9ccf-228b6f50d1fe/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_ba3beba8-dfc9-455c-9ccf-228b6f50d1fe/bin/utaipan-TEXQjIfE4P/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ba3beba8-dfc9-455c-9ccf-228b6f50d1fe/bin/utaipan-TEXQjIfE4P/config/TaipanReach.xml -i ../../sv-benchmarks/c/combinations/Problem05_label46+token_ring.13.cil-2.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ba3beba8-dfc9-455c-9ccf-228b6f50d1fe/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_ba3beba8-dfc9-455c-9ccf-228b6f50d1fe/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 29f58006f2dcb74445f74971d42059f9136b4de9a536aa3c519655ea459ca984 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-53f42b1 [2021-11-21 00:54:50,861 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-21 00:54:50,865 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-21 00:54:50,914 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-21 00:54:50,915 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-21 00:54:50,916 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-21 00:54:50,918 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-21 00:54:50,921 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-21 00:54:50,924 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-21 00:54:50,925 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-21 00:54:50,926 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-21 00:54:50,928 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-21 00:54:50,928 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-21 00:54:50,930 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-21 00:54:50,931 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-21 00:54:50,933 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-21 00:54:50,934 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-21 00:54:50,935 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-21 00:54:50,938 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-21 00:54:50,940 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-21 00:54:50,942 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-21 00:54:50,944 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-21 00:54:50,946 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-21 00:54:50,947 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-21 00:54:50,951 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-21 00:54:50,951 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-21 00:54:50,952 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-21 00:54:50,953 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-21 00:54:50,954 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-21 00:54:50,955 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-21 00:54:50,956 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-21 00:54:50,957 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-21 00:54:50,958 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-21 00:54:50,959 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-21 00:54:50,961 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-21 00:54:50,961 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-21 00:54:50,962 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-21 00:54:50,963 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-21 00:54:50,964 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-21 00:54:50,965 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-21 00:54:50,966 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-21 00:54:50,967 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ba3beba8-dfc9-455c-9ccf-228b6f50d1fe/bin/utaipan-TEXQjIfE4P/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-21 00:54:50,992 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-21 00:54:50,993 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-21 00:54:50,993 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-21 00:54:50,994 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-21 00:54:50,994 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-21 00:54:50,995 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-21 00:54:50,995 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-21 00:54:50,996 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-21 00:54:50,996 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-21 00:54:50,996 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-21 00:54:50,997 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-21 00:54:50,997 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-21 00:54:50,997 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-21 00:54:50,998 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-21 00:54:50,998 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-21 00:54:50,999 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-21 00:54:50,999 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-21 00:54:50,999 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-21 00:54:51,000 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-21 00:54:51,001 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-21 00:54:51,001 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-21 00:54:51,001 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-21 00:54:51,002 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-21 00:54:51,002 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-21 00:54:51,003 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-21 00:54:51,003 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-21 00:54:51,003 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-21 00:54:51,004 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-21 00:54:51,004 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-21 00:54:51,004 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-21 00:54:51,005 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-21 00:54:51,005 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-21 00:54:51,006 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-21 00:54:51,006 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-21 00:54:51,006 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-21 00:54:51,007 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-21 00:54:51,007 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-21 00:54:51,008 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-21 00:54:51,008 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-21 00:54:51,008 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-21 00:54:51,009 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-21 00:54:51,009 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_ba3beba8-dfc9-455c-9ccf-228b6f50d1fe/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ba3beba8-dfc9-455c-9ccf-228b6f50d1fe/bin/utaipan-TEXQjIfE4P Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 29f58006f2dcb74445f74971d42059f9136b4de9a536aa3c519655ea459ca984 [2021-11-21 00:54:51,276 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-21 00:54:51,297 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-21 00:54:51,300 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-21 00:54:51,301 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-21 00:54:51,302 INFO L275 PluginConnector]: CDTParser initialized [2021-11-21 00:54:51,303 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ba3beba8-dfc9-455c-9ccf-228b6f50d1fe/bin/utaipan-TEXQjIfE4P/../../sv-benchmarks/c/combinations/Problem05_label46+token_ring.13.cil-2.c [2021-11-21 00:54:51,367 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ba3beba8-dfc9-455c-9ccf-228b6f50d1fe/bin/utaipan-TEXQjIfE4P/data/aadc47c19/1abadb96670f4192872641ed7243973c/FLAGfd6d19b37 [2021-11-21 00:54:52,417 INFO L306 CDTParser]: Found 1 translation units. [2021-11-21 00:54:52,418 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ba3beba8-dfc9-455c-9ccf-228b6f50d1fe/sv-benchmarks/c/combinations/Problem05_label46+token_ring.13.cil-2.c [2021-11-21 00:54:52,477 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ba3beba8-dfc9-455c-9ccf-228b6f50d1fe/bin/utaipan-TEXQjIfE4P/data/aadc47c19/1abadb96670f4192872641ed7243973c/FLAGfd6d19b37 [2021-11-21 00:54:52,737 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ba3beba8-dfc9-455c-9ccf-228b6f50d1fe/bin/utaipan-TEXQjIfE4P/data/aadc47c19/1abadb96670f4192872641ed7243973c [2021-11-21 00:54:52,741 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-21 00:54:52,744 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-21 00:54:52,747 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-21 00:54:52,747 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-21 00:54:52,752 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-21 00:54:52,753 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 12:54:52" (1/1) ... [2021-11-21 00:54:52,756 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@75f168eb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:54:52, skipping insertion in model container [2021-11-21 00:54:52,757 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 12:54:52" (1/1) ... [2021-11-21 00:54:52,764 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-21 00:54:53,001 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-21 00:54:55,521 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_ba3beba8-dfc9-455c-9ccf-228b6f50d1fe/sv-benchmarks/c/combinations/Problem05_label46+token_ring.13.cil-2.c[382357,382370] [2021-11-21 00:54:55,546 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_ba3beba8-dfc9-455c-9ccf-228b6f50d1fe/sv-benchmarks/c/combinations/Problem05_label46+token_ring.13.cil-2.c[383339,383352] [2021-11-21 00:54:55,972 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-21 00:54:55,987 INFO L203 MainTranslator]: Completed pre-run [2021-11-21 00:54:57,177 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_ba3beba8-dfc9-455c-9ccf-228b6f50d1fe/sv-benchmarks/c/combinations/Problem05_label46+token_ring.13.cil-2.c[382357,382370] [2021-11-21 00:54:57,182 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_ba3beba8-dfc9-455c-9ccf-228b6f50d1fe/sv-benchmarks/c/combinations/Problem05_label46+token_ring.13.cil-2.c[383339,383352] [2021-11-21 00:54:57,220 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-21 00:54:57,317 INFO L208 MainTranslator]: Completed translation [2021-11-21 00:54:57,317 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:54:57 WrapperNode [2021-11-21 00:54:57,317 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-21 00:54:57,319 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-21 00:54:57,319 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-21 00:54:57,319 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-21 00:54:57,326 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:54:57" (1/1) ... [2021-11-21 00:54:57,431 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:54:57" (1/1) ... [2021-11-21 00:54:58,062 INFO L137 Inliner]: procedures = 70, calls = 80, calls flagged for inlining = 48, calls inlined = 48, statements flattened = 13257 [2021-11-21 00:54:58,062 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-21 00:54:58,063 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-21 00:54:58,063 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-21 00:54:58,064 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-21 00:54:58,073 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:54:57" (1/1) ... [2021-11-21 00:54:58,073 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:54:57" (1/1) ... [2021-11-21 00:54:58,188 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:54:57" (1/1) ... [2021-11-21 00:54:58,188 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:54:57" (1/1) ... [2021-11-21 00:54:58,538 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:54:57" (1/1) ... [2021-11-21 00:54:58,594 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:54:57" (1/1) ... [2021-11-21 00:54:58,615 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:54:57" (1/1) ... [2021-11-21 00:54:58,709 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-21 00:54:58,711 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-21 00:54:58,711 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-21 00:54:58,711 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-21 00:54:58,726 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:54:57" (1/1) ... [2021-11-21 00:54:58,734 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-21 00:54:58,758 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ba3beba8-dfc9-455c-9ccf-228b6f50d1fe/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:54:58,799 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ba3beba8-dfc9-455c-9ccf-228b6f50d1fe/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-21 00:54:58,865 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ba3beba8-dfc9-455c-9ccf-228b6f50d1fe/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-21 00:54:58,942 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-21 00:54:58,943 INFO L130 BoogieDeclarations]: Found specification of procedure activate_threads [2021-11-21 00:54:58,943 INFO L138 BoogieDeclarations]: Found implementation of procedure activate_threads [2021-11-21 00:54:58,943 INFO L130 BoogieDeclarations]: Found specification of procedure immediate_notify [2021-11-21 00:54:58,943 INFO L138 BoogieDeclarations]: Found implementation of procedure immediate_notify [2021-11-21 00:54:58,943 INFO L130 BoogieDeclarations]: Found specification of procedure update_channels [2021-11-21 00:54:58,944 INFO L138 BoogieDeclarations]: Found implementation of procedure update_channels [2021-11-21 00:54:58,944 INFO L130 BoogieDeclarations]: Found specification of procedure fire_delta_events [2021-11-21 00:54:58,944 INFO L138 BoogieDeclarations]: Found implementation of procedure fire_delta_events [2021-11-21 00:54:58,944 INFO L130 BoogieDeclarations]: Found specification of procedure exists_runnable_thread [2021-11-21 00:54:58,944 INFO L138 BoogieDeclarations]: Found implementation of procedure exists_runnable_thread [2021-11-21 00:54:58,944 INFO L130 BoogieDeclarations]: Found specification of procedure reset_delta_events [2021-11-21 00:54:58,944 INFO L138 BoogieDeclarations]: Found implementation of procedure reset_delta_events [2021-11-21 00:54:58,945 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-21 00:54:58,945 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-21 00:54:58,945 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-21 00:54:59,214 INFO L236 CfgBuilder]: Building ICFG [2021-11-21 00:54:59,216 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-21 00:55:07,069 INFO L277 CfgBuilder]: Performing block encoding [2021-11-21 00:55:09,085 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-21 00:55:09,085 INFO L301 CfgBuilder]: Removed 17 assume(true) statements. [2021-11-21 00:55:09,090 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 12:55:09 BoogieIcfgContainer [2021-11-21 00:55:09,090 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-21 00:55:09,092 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-21 00:55:09,092 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-21 00:55:09,096 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-21 00:55:09,096 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.11 12:54:52" (1/3) ... [2021-11-21 00:55:09,097 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5c93dae2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 12:55:09, skipping insertion in model container [2021-11-21 00:55:09,097 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:54:57" (2/3) ... [2021-11-21 00:55:09,098 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5c93dae2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 12:55:09, skipping insertion in model container [2021-11-21 00:55:09,098 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 12:55:09" (3/3) ... [2021-11-21 00:55:09,100 INFO L111 eAbstractionObserver]: Analyzing ICFG Problem05_label46+token_ring.13.cil-2.c [2021-11-21 00:55:09,108 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-21 00:55:09,108 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 2 error locations. [2021-11-21 00:55:09,169 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-21 00:55:09,176 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 00:55:09,176 INFO L340 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-11-21 00:55:09,323 INFO L276 IsEmpty]: Start isEmpty. Operand has 1842 states, 1806 states have (on average 1.9540420819490587) internal successors, (3529), 1809 states have internal predecessors, (3529), 27 states have call successors, (27), 6 states have call predecessors, (27), 6 states have return successors, (27), 27 states have call predecessors, (27), 27 states have call successors, (27) [2021-11-21 00:55:09,341 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2021-11-21 00:55:09,341 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:55:09,342 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:55:09,343 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:55:09,352 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:55:09,352 INFO L85 PathProgramCache]: Analyzing trace with hash -467274888, now seen corresponding path program 1 times [2021-11-21 00:55:09,362 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:55:09,363 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1604815443] [2021-11-21 00:55:09,363 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:55:09,364 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:55:09,608 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:55:09,838 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 00:55:09,838 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:55:09,839 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1604815443] [2021-11-21 00:55:09,840 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1604815443] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:55:09,840 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:55:09,840 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-21 00:55:09,842 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [423579930] [2021-11-21 00:55:09,843 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:55:09,847 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-21 00:55:09,848 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:55:09,892 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-21 00:55:09,893 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-21 00:55:09,901 INFO L87 Difference]: Start difference. First operand has 1842 states, 1806 states have (on average 1.9540420819490587) internal successors, (3529), 1809 states have internal predecessors, (3529), 27 states have call successors, (27), 6 states have call predecessors, (27), 6 states have return successors, (27), 27 states have call predecessors, (27), 27 states have call successors, (27) Second operand has 4 states, 4 states have (on average 15.0) internal successors, (60), 4 states have internal predecessors, (60), 2 states have call successors, (5), 1 states have call predecessors, (5), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2021-11-21 00:55:11,055 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:55:11,055 INFO L93 Difference]: Finished difference Result 3866 states and 7483 transitions. [2021-11-21 00:55:11,056 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-21 00:55:11,058 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 15.0) internal successors, (60), 4 states have internal predecessors, (60), 2 states have call successors, (5), 1 states have call predecessors, (5), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) Word has length 70 [2021-11-21 00:55:11,059 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:55:11,098 INFO L225 Difference]: With dead ends: 3866 [2021-11-21 00:55:11,098 INFO L226 Difference]: Without dead ends: 2023 [2021-11-21 00:55:11,113 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 00:55:11,116 INFO L933 BasicCegarLoop]: 3541 mSDtfsCounter, 3812 mSDsluCounter, 3753 mSDsCounter, 0 mSdLazyCounter, 742 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3812 SdHoareTripleChecker+Valid, 6980 SdHoareTripleChecker+Invalid, 756 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 742 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-21 00:55:11,118 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3812 Valid, 6980 Invalid, 756 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [14 Valid, 742 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2021-11-21 00:55:11,141 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2023 states. [2021-11-21 00:55:11,267 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2023 to 2022. [2021-11-21 00:55:11,274 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2022 states, 1958 states have (on average 1.916241062308478) internal successors, (3752), 1961 states have internal predecessors, (3752), 50 states have call successors, (50), 12 states have call predecessors, (50), 12 states have return successors, (50), 49 states have call predecessors, (50), 50 states have call successors, (50) [2021-11-21 00:55:11,291 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2022 states to 2022 states and 3852 transitions. [2021-11-21 00:55:11,292 INFO L78 Accepts]: Start accepts. Automaton has 2022 states and 3852 transitions. Word has length 70 [2021-11-21 00:55:11,293 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:55:11,293 INFO L470 AbstractCegarLoop]: Abstraction has 2022 states and 3852 transitions. [2021-11-21 00:55:11,294 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 15.0) internal successors, (60), 4 states have internal predecessors, (60), 2 states have call successors, (5), 1 states have call predecessors, (5), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2021-11-21 00:55:11,294 INFO L276 IsEmpty]: Start isEmpty. Operand 2022 states and 3852 transitions. [2021-11-21 00:55:11,305 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 144 [2021-11-21 00:55:11,305 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:55:11,305 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 00:55:11,306 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-21 00:55:11,306 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:55:11,307 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:55:11,308 INFO L85 PathProgramCache]: Analyzing trace with hash 895343619, now seen corresponding path program 1 times [2021-11-21 00:55:11,308 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:55:11,308 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2045504768] [2021-11-21 00:55:11,309 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:55:11,309 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:55:11,348 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:55:11,530 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-21 00:55:11,530 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:55:11,530 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2045504768] [2021-11-21 00:55:11,531 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2045504768] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:55:11,531 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [22763039] [2021-11-21 00:55:11,531 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:55:11,532 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:55:11,532 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ba3beba8-dfc9-455c-9ccf-228b6f50d1fe/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:55:11,534 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ba3beba8-dfc9-455c-9ccf-228b6f50d1fe/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:55:11,552 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ba3beba8-dfc9-455c-9ccf-228b6f50d1fe/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-21 00:55:11,790 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:55:11,796 INFO L263 TraceCheckSpWp]: Trace formula consists of 1116 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-21 00:55:11,809 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:55:12,155 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 29 proven. 0 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-21 00:55:12,157 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 00:55:12,163 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [22763039] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:55:12,163 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-21 00:55:12,163 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2021-11-21 00:55:12,165 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1474056553] [2021-11-21 00:55:12,166 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:55:12,167 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 00:55:12,167 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:55:12,168 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 00:55:12,173 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-21 00:55:12,174 INFO L87 Difference]: Start difference. First operand 2022 states and 3852 transitions. Second operand has 3 states, 3 states have (on average 35.666666666666664) internal successors, (107), 2 states have internal predecessors, (107), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-21 00:55:12,747 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:55:12,747 INFO L93 Difference]: Finished difference Result 2767 states and 5025 transitions. [2021-11-21 00:55:12,747 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 00:55:12,748 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 35.666666666666664) internal successors, (107), 2 states have internal predecessors, (107), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 143 [2021-11-21 00:55:12,748 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:55:12,772 INFO L225 Difference]: With dead ends: 2767 [2021-11-21 00:55:12,772 INFO L226 Difference]: Without dead ends: 2391 [2021-11-21 00:55:12,775 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 147 GetRequests, 143 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 00:55:12,777 INFO L933 BasicCegarLoop]: 3360 mSDtfsCounter, 3525 mSDsluCounter, 286 mSDsCounter, 0 mSdLazyCounter, 322 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3525 SdHoareTripleChecker+Valid, 3600 SdHoareTripleChecker+Invalid, 324 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 322 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-21 00:55:12,779 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3525 Valid, 3600 Invalid, 324 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 322 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-21 00:55:12,788 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2391 states. [2021-11-21 00:55:12,884 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2391 to 2387. [2021-11-21 00:55:12,891 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2387 states, 2267 states have (on average 1.8619320688134098) internal successors, (4221), 2271 states have internal predecessors, (4221), 94 states have call successors, (94), 24 states have call predecessors, (94), 24 states have return successors, (94), 92 states have call predecessors, (94), 94 states have call successors, (94) [2021-11-21 00:55:12,914 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2387 states to 2387 states and 4409 transitions. [2021-11-21 00:55:12,914 INFO L78 Accepts]: Start accepts. Automaton has 2387 states and 4409 transitions. Word has length 143 [2021-11-21 00:55:12,917 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:55:12,917 INFO L470 AbstractCegarLoop]: Abstraction has 2387 states and 4409 transitions. [2021-11-21 00:55:12,918 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 35.666666666666664) internal successors, (107), 2 states have internal predecessors, (107), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-21 00:55:12,918 INFO L276 IsEmpty]: Start isEmpty. Operand 2387 states and 4409 transitions. [2021-11-21 00:55:12,926 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 144 [2021-11-21 00:55:12,927 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:55:12,927 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 00:55:12,969 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ba3beba8-dfc9-455c-9ccf-228b6f50d1fe/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-21 00:55:13,141 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ba3beba8-dfc9-455c-9ccf-228b6f50d1fe/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2021-11-21 00:55:13,142 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:55:13,142 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:55:13,143 INFO L85 PathProgramCache]: Analyzing trace with hash 309325829, now seen corresponding path program 1 times [2021-11-21 00:55:13,143 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:55:13,143 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [630337759] [2021-11-21 00:55:13,143 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:55:13,143 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:55:13,176 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:55:13,274 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-21 00:55:13,274 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:55:13,275 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [630337759] [2021-11-21 00:55:13,275 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [630337759] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:55:13,275 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [122534557] [2021-11-21 00:55:13,275 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:55:13,276 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:55:13,276 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ba3beba8-dfc9-455c-9ccf-228b6f50d1fe/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:55:13,277 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ba3beba8-dfc9-455c-9ccf-228b6f50d1fe/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:55:13,300 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ba3beba8-dfc9-455c-9ccf-228b6f50d1fe/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-21 00:55:13,526 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:55:13,531 INFO L263 TraceCheckSpWp]: Trace formula consists of 1110 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-21 00:55:13,544 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:55:13,869 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 17 proven. 0 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-11-21 00:55:13,870 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 00:55:13,870 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [122534557] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:55:13,870 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-21 00:55:13,870 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2021-11-21 00:55:13,870 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [841387605] [2021-11-21 00:55:13,871 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:55:13,871 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 00:55:13,871 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:55:13,872 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 00:55:13,872 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-21 00:55:13,872 INFO L87 Difference]: Start difference. First operand 2387 states and 4409 transitions. Second operand has 3 states, 3 states have (on average 31.666666666666668) internal successors, (95), 2 states have internal predecessors, (95), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-21 00:55:14,454 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:55:14,455 INFO L93 Difference]: Finished difference Result 3856 states and 6716 transitions. [2021-11-21 00:55:14,455 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 00:55:14,456 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 31.666666666666668) internal successors, (95), 2 states have internal predecessors, (95), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 143 [2021-11-21 00:55:14,456 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:55:14,481 INFO L225 Difference]: With dead ends: 3856 [2021-11-21 00:55:14,482 INFO L226 Difference]: Without dead ends: 3115 [2021-11-21 00:55:14,487 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 147 GetRequests, 143 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 00:55:14,489 INFO L933 BasicCegarLoop]: 3348 mSDtfsCounter, 3537 mSDsluCounter, 286 mSDsCounter, 0 mSdLazyCounter, 319 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3537 SdHoareTripleChecker+Valid, 3588 SdHoareTripleChecker+Invalid, 321 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 319 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-21 00:55:14,489 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3537 Valid, 3588 Invalid, 321 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 319 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-21 00:55:14,496 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3115 states. [2021-11-21 00:55:14,611 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3115 to 3109. [2021-11-21 00:55:14,620 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3109 states, 2879 states have (on average 1.7877735324765545) internal successors, (5147), 2885 states have internal predecessors, (5147), 180 states have call successors, (180), 48 states have call predecessors, (180), 48 states have return successors, (180), 176 states have call predecessors, (180), 180 states have call successors, (180) [2021-11-21 00:55:14,645 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3109 states to 3109 states and 5507 transitions. [2021-11-21 00:55:14,645 INFO L78 Accepts]: Start accepts. Automaton has 3109 states and 5507 transitions. Word has length 143 [2021-11-21 00:55:14,646 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:55:14,646 INFO L470 AbstractCegarLoop]: Abstraction has 3109 states and 5507 transitions. [2021-11-21 00:55:14,646 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 31.666666666666668) internal successors, (95), 2 states have internal predecessors, (95), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-21 00:55:14,646 INFO L276 IsEmpty]: Start isEmpty. Operand 3109 states and 5507 transitions. [2021-11-21 00:55:14,654 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 144 [2021-11-21 00:55:14,654 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:55:14,654 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 00:55:14,693 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ba3beba8-dfc9-455c-9ccf-228b6f50d1fe/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-21 00:55:14,869 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ba3beba8-dfc9-455c-9ccf-228b6f50d1fe/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:55:14,870 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:55:14,870 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:55:14,870 INFO L85 PathProgramCache]: Analyzing trace with hash -32894713, now seen corresponding path program 1 times [2021-11-21 00:55:14,870 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:55:14,871 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [441356674] [2021-11-21 00:55:14,871 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:55:14,871 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:55:14,899 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:55:14,979 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-21 00:55:14,979 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:55:14,979 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [441356674] [2021-11-21 00:55:14,982 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [441356674] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:55:14,986 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1632396075] [2021-11-21 00:55:14,987 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:55:14,987 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:55:14,987 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ba3beba8-dfc9-455c-9ccf-228b6f50d1fe/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:55:14,993 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ba3beba8-dfc9-455c-9ccf-228b6f50d1fe/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:55:15,013 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ba3beba8-dfc9-455c-9ccf-228b6f50d1fe/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-21 00:55:15,228 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:55:15,233 INFO L263 TraceCheckSpWp]: Trace formula consists of 1104 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-21 00:55:15,239 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:55:15,605 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 35 proven. 0 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-11-21 00:55:15,605 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 00:55:15,606 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1632396075] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:55:15,606 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-21 00:55:15,606 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2021-11-21 00:55:15,606 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [311028262] [2021-11-21 00:55:15,606 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:55:15,607 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 00:55:15,607 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:55:15,608 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 00:55:15,608 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-21 00:55:15,608 INFO L87 Difference]: Start difference. First operand 3109 states and 5507 transitions. Second operand has 3 states, 3 states have (on average 37.666666666666664) internal successors, (113), 2 states have internal predecessors, (113), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-21 00:55:16,217 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:55:16,218 INFO L93 Difference]: Finished difference Result 6010 states and 10048 transitions. [2021-11-21 00:55:16,222 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 00:55:16,223 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 37.666666666666664) internal successors, (113), 2 states have internal predecessors, (113), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 143 [2021-11-21 00:55:16,223 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:55:16,260 INFO L225 Difference]: With dead ends: 6010 [2021-11-21 00:55:16,261 INFO L226 Difference]: Without dead ends: 4547 [2021-11-21 00:55:16,269 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 147 GetRequests, 143 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 00:55:16,271 INFO L933 BasicCegarLoop]: 3326 mSDtfsCounter, 3519 mSDsluCounter, 286 mSDsCounter, 0 mSdLazyCounter, 319 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3519 SdHoareTripleChecker+Valid, 3566 SdHoareTripleChecker+Invalid, 321 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 319 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-21 00:55:16,273 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3519 Valid, 3566 Invalid, 321 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 319 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-21 00:55:16,283 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4547 states. [2021-11-21 00:55:16,484 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4547 to 4537. [2021-11-21 00:55:16,500 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4537 states, 4091 states have (on average 1.7049621119530678) internal successors, (6975), 4101 states have internal predecessors, (6975), 348 states have call successors, (348), 96 states have call predecessors, (348), 96 states have return successors, (348), 340 states have call predecessors, (348), 348 states have call successors, (348) [2021-11-21 00:55:16,533 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4537 states to 4537 states and 7671 transitions. [2021-11-21 00:55:16,535 INFO L78 Accepts]: Start accepts. Automaton has 4537 states and 7671 transitions. Word has length 143 [2021-11-21 00:55:16,536 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:55:16,536 INFO L470 AbstractCegarLoop]: Abstraction has 4537 states and 7671 transitions. [2021-11-21 00:55:16,536 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 37.666666666666664) internal successors, (113), 2 states have internal predecessors, (113), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-21 00:55:16,536 INFO L276 IsEmpty]: Start isEmpty. Operand 4537 states and 7671 transitions. [2021-11-21 00:55:16,547 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 144 [2021-11-21 00:55:16,548 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:55:16,548 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 00:55:16,586 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ba3beba8-dfc9-455c-9ccf-228b6f50d1fe/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-21 00:55:16,761 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ba3beba8-dfc9-455c-9ccf-228b6f50d1fe/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:55:16,761 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:55:16,762 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:55:16,762 INFO L85 PathProgramCache]: Analyzing trace with hash 1194577545, now seen corresponding path program 1 times [2021-11-21 00:55:16,762 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:55:16,762 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1192677458] [2021-11-21 00:55:16,763 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:55:16,763 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:55:16,964 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:55:17,064 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-21 00:55:17,064 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:55:17,064 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1192677458] [2021-11-21 00:55:17,065 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1192677458] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:55:17,065 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [93129084] [2021-11-21 00:55:17,065 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:55:17,065 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:55:17,065 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ba3beba8-dfc9-455c-9ccf-228b6f50d1fe/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:55:17,066 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ba3beba8-dfc9-455c-9ccf-228b6f50d1fe/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:55:17,084 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ba3beba8-dfc9-455c-9ccf-228b6f50d1fe/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-21 00:55:17,309 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:55:17,314 INFO L263 TraceCheckSpWp]: Trace formula consists of 1098 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-21 00:55:17,318 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:55:17,570 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2021-11-21 00:55:17,570 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 00:55:17,570 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [93129084] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:55:17,570 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-21 00:55:17,571 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2021-11-21 00:55:17,571 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [310317597] [2021-11-21 00:55:17,571 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:55:17,572 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 00:55:17,572 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:55:17,573 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 00:55:17,573 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-21 00:55:17,573 INFO L87 Difference]: Start difference. First operand 4537 states and 7671 transitions. Second operand has 3 states, 3 states have (on average 29.666666666666668) internal successors, (89), 2 states have internal predecessors, (89), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-21 00:55:18,206 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:55:18,207 INFO L93 Difference]: Finished difference Result 10270 states and 16612 transitions. [2021-11-21 00:55:18,207 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 00:55:18,207 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 29.666666666666668) internal successors, (89), 2 states have internal predecessors, (89), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 143 [2021-11-21 00:55:18,208 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:55:18,260 INFO L225 Difference]: With dead ends: 10270 [2021-11-21 00:55:18,261 INFO L226 Difference]: Without dead ends: 7379 [2021-11-21 00:55:18,277 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 147 GetRequests, 143 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 00:55:18,278 INFO L933 BasicCegarLoop]: 3346 mSDtfsCounter, 3543 mSDsluCounter, 286 mSDsCounter, 0 mSdLazyCounter, 319 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3543 SdHoareTripleChecker+Valid, 3586 SdHoareTripleChecker+Invalid, 321 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 319 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-21 00:55:18,279 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3543 Valid, 3586 Invalid, 321 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 319 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-21 00:55:18,290 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7379 states. [2021-11-21 00:55:18,600 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7379 to 7361. [2021-11-21 00:55:18,633 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 7361 states, 6491 states have (on average 1.6304113387767678) internal successors, (10583), 6509 states have internal predecessors, (10583), 676 states have call successors, (676), 192 states have call predecessors, (676), 192 states have return successors, (676), 660 states have call predecessors, (676), 676 states have call successors, (676) [2021-11-21 00:55:18,667 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7361 states to 7361 states and 11935 transitions. [2021-11-21 00:55:18,668 INFO L78 Accepts]: Start accepts. Automaton has 7361 states and 11935 transitions. Word has length 143 [2021-11-21 00:55:18,668 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:55:18,668 INFO L470 AbstractCegarLoop]: Abstraction has 7361 states and 11935 transitions. [2021-11-21 00:55:18,669 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 29.666666666666668) internal successors, (89), 2 states have internal predecessors, (89), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-21 00:55:18,669 INFO L276 IsEmpty]: Start isEmpty. Operand 7361 states and 11935 transitions. [2021-11-21 00:55:18,685 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 144 [2021-11-21 00:55:18,685 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:55:18,685 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 00:55:18,722 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ba3beba8-dfc9-455c-9ccf-228b6f50d1fe/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2021-11-21 00:55:18,909 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ba3beba8-dfc9-455c-9ccf-228b6f50d1fe/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:55:18,909 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:55:18,910 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:55:18,910 INFO L85 PathProgramCache]: Analyzing trace with hash -1363302901, now seen corresponding path program 1 times [2021-11-21 00:55:18,910 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:55:18,910 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1640793624] [2021-11-21 00:55:18,910 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:55:18,911 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:55:18,937 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:55:19,039 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-21 00:55:19,039 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:55:19,040 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1640793624] [2021-11-21 00:55:19,040 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1640793624] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:55:19,040 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2130313956] [2021-11-21 00:55:19,040 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:55:19,040 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:55:19,041 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ba3beba8-dfc9-455c-9ccf-228b6f50d1fe/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:55:19,042 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ba3beba8-dfc9-455c-9ccf-228b6f50d1fe/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:55:19,061 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ba3beba8-dfc9-455c-9ccf-228b6f50d1fe/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-21 00:55:19,282 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:55:19,287 INFO L263 TraceCheckSpWp]: Trace formula consists of 1092 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-21 00:55:19,291 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:55:19,536 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-11-21 00:55:19,536 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 00:55:19,537 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2130313956] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:55:19,537 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-21 00:55:19,537 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2021-11-21 00:55:19,537 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1139007510] [2021-11-21 00:55:19,537 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:55:19,538 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 00:55:19,538 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:55:19,539 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 00:55:19,539 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-21 00:55:19,539 INFO L87 Difference]: Start difference. First operand 7361 states and 11935 transitions. Second operand has 3 states, 3 states have (on average 28.666666666666668) internal successors, (86), 2 states have internal predecessors, (86), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-21 00:55:20,357 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:55:20,358 INFO L93 Difference]: Finished difference Result 18694 states and 29540 transitions. [2021-11-21 00:55:20,358 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 00:55:20,359 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 28.666666666666668) internal successors, (86), 2 states have internal predecessors, (86), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 143 [2021-11-21 00:55:20,359 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:55:20,449 INFO L225 Difference]: With dead ends: 18694 [2021-11-21 00:55:20,450 INFO L226 Difference]: Without dead ends: 12979 [2021-11-21 00:55:20,484 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 147 GetRequests, 143 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 00:55:20,485 INFO L933 BasicCegarLoop]: 3356 mSDtfsCounter, 3546 mSDsluCounter, 286 mSDsCounter, 0 mSdLazyCounter, 322 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3546 SdHoareTripleChecker+Valid, 3596 SdHoareTripleChecker+Invalid, 324 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 322 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-21 00:55:20,486 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3546 Valid, 3596 Invalid, 324 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 322 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-21 00:55:20,509 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12979 states. [2021-11-21 00:55:21,231 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12979 to 12945. [2021-11-21 00:55:21,251 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 12945 states, 11243 states have (on average 1.574579738503958) internal successors, (17703), 11277 states have internal predecessors, (17703), 1316 states have call successors, (1316), 384 states have call predecessors, (1316), 384 states have return successors, (1316), 1284 states have call predecessors, (1316), 1316 states have call successors, (1316) [2021-11-21 00:55:21,304 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12945 states to 12945 states and 20335 transitions. [2021-11-21 00:55:21,306 INFO L78 Accepts]: Start accepts. Automaton has 12945 states and 20335 transitions. Word has length 143 [2021-11-21 00:55:21,306 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:55:21,306 INFO L470 AbstractCegarLoop]: Abstraction has 12945 states and 20335 transitions. [2021-11-21 00:55:21,307 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 28.666666666666668) internal successors, (86), 2 states have internal predecessors, (86), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-21 00:55:21,307 INFO L276 IsEmpty]: Start isEmpty. Operand 12945 states and 20335 transitions. [2021-11-21 00:55:21,337 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 144 [2021-11-21 00:55:21,337 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:55:21,337 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 00:55:21,378 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ba3beba8-dfc9-455c-9ccf-228b6f50d1fe/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-21 00:55:21,553 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ba3beba8-dfc9-455c-9ccf-228b6f50d1fe/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2021-11-21 00:55:21,553 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:55:21,554 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:55:21,554 INFO L85 PathProgramCache]: Analyzing trace with hash -1869904055, now seen corresponding path program 1 times [2021-11-21 00:55:21,554 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:55:21,554 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1420031709] [2021-11-21 00:55:21,554 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:55:21,554 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:55:21,592 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:55:21,657 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-21 00:55:21,658 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:55:21,658 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1420031709] [2021-11-21 00:55:21,658 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1420031709] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:55:21,658 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [494728753] [2021-11-21 00:55:21,658 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:55:21,659 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:55:21,659 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ba3beba8-dfc9-455c-9ccf-228b6f50d1fe/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:55:21,660 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ba3beba8-dfc9-455c-9ccf-228b6f50d1fe/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:55:21,682 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ba3beba8-dfc9-455c-9ccf-228b6f50d1fe/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-21 00:55:21,911 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:55:21,916 INFO L263 TraceCheckSpWp]: Trace formula consists of 1086 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-21 00:55:21,920 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:55:22,269 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 38 proven. 0 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-21 00:55:22,271 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 00:55:22,271 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [494728753] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:55:22,272 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-21 00:55:22,272 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2021-11-21 00:55:22,272 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [637661691] [2021-11-21 00:55:22,273 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:55:22,273 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 00:55:22,273 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:55:22,274 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 00:55:22,274 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-21 00:55:22,274 INFO L87 Difference]: Start difference. First operand 12945 states and 20335 transitions. Second operand has 3 states, 3 states have (on average 38.666666666666664) internal successors, (116), 2 states have internal predecessors, (116), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-21 00:55:23,352 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:55:23,352 INFO L93 Difference]: Finished difference Result 35350 states and 54996 transitions. [2021-11-21 00:55:23,353 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 00:55:23,353 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 38.666666666666664) internal successors, (116), 2 states have internal predecessors, (116), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 143 [2021-11-21 00:55:23,353 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:55:23,459 INFO L225 Difference]: With dead ends: 35350 [2021-11-21 00:55:23,459 INFO L226 Difference]: Without dead ends: 24051 [2021-11-21 00:55:23,513 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 147 GetRequests, 143 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 00:55:23,514 INFO L933 BasicCegarLoop]: 3326 mSDtfsCounter, 3516 mSDsluCounter, 286 mSDsCounter, 0 mSdLazyCounter, 319 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3516 SdHoareTripleChecker+Valid, 3566 SdHoareTripleChecker+Invalid, 321 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 319 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-21 00:55:23,517 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3516 Valid, 3566 Invalid, 321 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 319 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-21 00:55:23,558 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24051 states. [2021-11-21 00:55:24,804 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24051 to 23985. [2021-11-21 00:55:24,840 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23985 states, 20651 states have (on average 1.53750423708295) internal successors, (31751), 20717 states have internal predecessors, (31751), 2564 states have call successors, (2564), 768 states have call predecessors, (2564), 768 states have return successors, (2564), 2500 states have call predecessors, (2564), 2564 states have call successors, (2564) [2021-11-21 00:55:24,957 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23985 states to 23985 states and 36879 transitions. [2021-11-21 00:55:24,959 INFO L78 Accepts]: Start accepts. Automaton has 23985 states and 36879 transitions. Word has length 143 [2021-11-21 00:55:24,960 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:55:24,960 INFO L470 AbstractCegarLoop]: Abstraction has 23985 states and 36879 transitions. [2021-11-21 00:55:24,960 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 38.666666666666664) internal successors, (116), 2 states have internal predecessors, (116), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-21 00:55:24,961 INFO L276 IsEmpty]: Start isEmpty. Operand 23985 states and 36879 transitions. [2021-11-21 00:55:25,022 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 144 [2021-11-21 00:55:25,022 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:55:25,023 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 00:55:25,061 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ba3beba8-dfc9-455c-9ccf-228b6f50d1fe/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-21 00:55:25,237 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ba3beba8-dfc9-455c-9ccf-228b6f50d1fe/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2021-11-21 00:55:25,238 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:55:25,238 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:55:25,238 INFO L85 PathProgramCache]: Analyzing trace with hash 1015843079, now seen corresponding path program 1 times [2021-11-21 00:55:25,238 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:55:25,238 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1310325401] [2021-11-21 00:55:25,238 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:55:25,238 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:55:25,281 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:55:25,369 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-21 00:55:25,369 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:55:25,369 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1310325401] [2021-11-21 00:55:25,370 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1310325401] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:55:25,370 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [883614844] [2021-11-21 00:55:25,370 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:55:25,370 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:55:25,370 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ba3beba8-dfc9-455c-9ccf-228b6f50d1fe/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:55:25,374 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ba3beba8-dfc9-455c-9ccf-228b6f50d1fe/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:55:25,393 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ba3beba8-dfc9-455c-9ccf-228b6f50d1fe/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-21 00:55:25,617 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:55:25,622 INFO L263 TraceCheckSpWp]: Trace formula consists of 1080 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-21 00:55:25,626 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:55:25,937 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 23 proven. 0 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2021-11-21 00:55:25,937 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 00:55:25,937 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [883614844] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:55:25,937 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-21 00:55:25,937 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2021-11-21 00:55:25,938 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1997755340] [2021-11-21 00:55:25,938 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:55:25,938 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 00:55:25,939 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:55:25,939 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 00:55:25,939 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-21 00:55:25,939 INFO L87 Difference]: Start difference. First operand 23985 states and 36879 transitions. Second operand has 3 states, 3 states have (on average 33.666666666666664) internal successors, (101), 2 states have internal predecessors, (101), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-21 00:55:27,792 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:55:27,792 INFO L93 Difference]: Finished difference Result 68278 states and 105108 transitions. [2021-11-21 00:55:27,792 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 00:55:27,793 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 33.666666666666664) internal successors, (101), 2 states have internal predecessors, (101), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 143 [2021-11-21 00:55:27,794 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:55:28,028 INFO L225 Difference]: With dead ends: 68278 [2021-11-21 00:55:28,028 INFO L226 Difference]: Without dead ends: 45939 [2021-11-21 00:55:28,097 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 147 GetRequests, 143 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 00:55:28,098 INFO L933 BasicCegarLoop]: 3326 mSDtfsCounter, 3531 mSDsluCounter, 286 mSDsCounter, 0 mSdLazyCounter, 319 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3531 SdHoareTripleChecker+Valid, 3566 SdHoareTripleChecker+Invalid, 321 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 319 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-21 00:55:28,098 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3531 Valid, 3566 Invalid, 321 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 319 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-21 00:55:28,142 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45939 states. [2021-11-21 00:55:29,927 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45939 to 45809. [2021-11-21 00:55:29,990 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45809 states, 39275 states have (on average 1.514016549968173) internal successors, (59463), 39405 states have internal predecessors, (59463), 4996 states have call successors, (4996), 1536 states have call predecessors, (4996), 1536 states have return successors, (4996), 4868 states have call predecessors, (4996), 4996 states have call successors, (4996) [2021-11-21 00:55:30,221 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45809 states to 45809 states and 69455 transitions. [2021-11-21 00:55:30,228 INFO L78 Accepts]: Start accepts. Automaton has 45809 states and 69455 transitions. Word has length 143 [2021-11-21 00:55:30,228 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:55:30,228 INFO L470 AbstractCegarLoop]: Abstraction has 45809 states and 69455 transitions. [2021-11-21 00:55:30,228 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 33.666666666666664) internal successors, (101), 2 states have internal predecessors, (101), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-21 00:55:30,229 INFO L276 IsEmpty]: Start isEmpty. Operand 45809 states and 69455 transitions. [2021-11-21 00:55:30,325 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 144 [2021-11-21 00:55:30,325 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:55:30,326 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 00:55:30,365 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ba3beba8-dfc9-455c-9ccf-228b6f50d1fe/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-21 00:55:30,541 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ba3beba8-dfc9-455c-9ccf-228b6f50d1fe/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2021-11-21 00:55:30,541 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:55:30,542 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:55:30,542 INFO L85 PathProgramCache]: Analyzing trace with hash -359918711, now seen corresponding path program 1 times [2021-11-21 00:55:30,542 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:55:30,542 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1596321908] [2021-11-21 00:55:30,542 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:55:30,542 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:55:30,584 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:55:30,677 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 46 trivial. 0 not checked. [2021-11-21 00:55:30,677 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:55:30,677 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1596321908] [2021-11-21 00:55:30,678 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1596321908] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:55:30,678 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:55:30,678 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-21 00:55:30,680 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [538809038] [2021-11-21 00:55:30,681 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:55:30,682 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-21 00:55:30,682 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:55:30,683 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-21 00:55:30,683 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-21 00:55:30,683 INFO L87 Difference]: Start difference. First operand 45809 states and 69455 transitions. Second operand has 6 states, 6 states have (on average 13.833333333333334) internal successors, (83), 6 states have internal predecessors, (83), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2021-11-21 00:55:35,371 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:55:35,371 INFO L93 Difference]: Finished difference Result 156917 states and 235730 transitions. [2021-11-21 00:55:35,372 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-21 00:55:35,372 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), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) Word has length 143 [2021-11-21 00:55:35,373 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:55:36,142 INFO L225 Difference]: With dead ends: 156917 [2021-11-21 00:55:36,142 INFO L226 Difference]: Without dead ends: 112755 [2021-11-21 00:55:36,287 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=41, Invalid=69, Unknown=0, NotChecked=0, Total=110 [2021-11-21 00:55:36,291 INFO L933 BasicCegarLoop]: 3329 mSDtfsCounter, 4482 mSDsluCounter, 7126 mSDsCounter, 0 mSdLazyCounter, 949 mSolverCounterSat, 152 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4504 SdHoareTripleChecker+Valid, 9930 SdHoareTripleChecker+Invalid, 1101 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 152 IncrementalHoareTripleChecker+Valid, 949 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2021-11-21 00:55:36,291 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [4504 Valid, 9930 Invalid, 1101 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [152 Valid, 949 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2021-11-21 00:55:36,407 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112755 states. [2021-11-21 00:55:40,044 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112755 to 88433. [2021-11-21 00:55:40,118 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 88433 states, 75627 states have (on average 1.4988165602232006) internal successors, (113351), 75885 states have internal predecessors, (113351), 9732 states have call successors, (9732), 3072 states have call predecessors, (9732), 3072 states have return successors, (9732), 9476 states have call predecessors, (9732), 9732 states have call successors, (9732) [2021-11-21 00:55:40,474 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88433 states to 88433 states and 132815 transitions. [2021-11-21 00:55:40,485 INFO L78 Accepts]: Start accepts. Automaton has 88433 states and 132815 transitions. Word has length 143 [2021-11-21 00:55:40,487 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:55:40,487 INFO L470 AbstractCegarLoop]: Abstraction has 88433 states and 132815 transitions. [2021-11-21 00:55:40,487 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), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2021-11-21 00:55:40,488 INFO L276 IsEmpty]: Start isEmpty. Operand 88433 states and 132815 transitions. [2021-11-21 00:55:41,041 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 145 [2021-11-21 00:55:41,041 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:55:41,041 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 00:55:41,041 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-11-21 00:55:41,042 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:55:41,042 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:55:41,042 INFO L85 PathProgramCache]: Analyzing trace with hash 2108141672, now seen corresponding path program 1 times [2021-11-21 00:55:41,043 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:55:41,043 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [711094363] [2021-11-21 00:55:41,043 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:55:41,043 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:55:41,111 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:55:41,237 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 46 trivial. 0 not checked. [2021-11-21 00:55:41,237 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:55:41,237 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [711094363] [2021-11-21 00:55:41,238 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [711094363] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:55:41,238 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:55:41,238 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-21 00:55:41,238 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1618255710] [2021-11-21 00:55:41,238 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:55:41,239 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-21 00:55:41,239 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:55:41,240 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-21 00:55:41,240 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-21 00:55:41,240 INFO L87 Difference]: Start difference. First operand 88433 states and 132815 transitions. Second operand has 6 states, 6 states have (on average 14.0) internal successors, (84), 6 states have internal predecessors, (84), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2021-11-21 00:55:47,064 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:55:47,064 INFO L93 Difference]: Finished difference Result 238325 states and 357457 transitions. [2021-11-21 00:55:47,064 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-21 00:55:47,065 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 14.0) internal successors, (84), 6 states have internal predecessors, (84), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) Word has length 144 [2021-11-21 00:55:47,065 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:55:48,103 INFO L225 Difference]: With dead ends: 238325 [2021-11-21 00:55:48,104 INFO L226 Difference]: Without dead ends: 151539 [2021-11-21 00:55:48,386 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=41, Invalid=69, Unknown=0, NotChecked=0, Total=110 [2021-11-21 00:55:48,386 INFO L933 BasicCegarLoop]: 3321 mSDtfsCounter, 4253 mSDsluCounter, 10682 mSDsCounter, 0 mSdLazyCounter, 1257 mSolverCounterSat, 160 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4259 SdHoareTripleChecker+Valid, 13220 SdHoareTripleChecker+Invalid, 1417 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 160 IncrementalHoareTripleChecker+Valid, 1257 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2021-11-21 00:55:48,388 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [4259 Valid, 13220 Invalid, 1417 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [160 Valid, 1257 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2021-11-21 00:55:48,542 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 151539 states. [2021-11-21 00:55:54,595 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 151539 to 130801. [2021-11-21 00:55:54,726 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 130801 states, 111723 states have (on average 1.4911790768239306) internal successors, (166599), 112109 states have internal predecessors, (166599), 14468 states have call successors, (14468), 4608 states have call predecessors, (14468), 4608 states have return successors, (14468), 14084 states have call predecessors, (14468), 14468 states have call successors, (14468) [2021-11-21 00:55:55,424 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 130801 states to 130801 states and 195535 transitions. [2021-11-21 00:55:55,447 INFO L78 Accepts]: Start accepts. Automaton has 130801 states and 195535 transitions. Word has length 144 [2021-11-21 00:55:55,448 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:55:55,448 INFO L470 AbstractCegarLoop]: Abstraction has 130801 states and 195535 transitions. [2021-11-21 00:55:55,449 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 14.0) internal successors, (84), 6 states have internal predecessors, (84), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2021-11-21 00:55:55,449 INFO L276 IsEmpty]: Start isEmpty. Operand 130801 states and 195535 transitions. [2021-11-21 00:55:55,639 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 146 [2021-11-21 00:55:55,639 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:55:55,639 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 00:55:55,639 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2021-11-21 00:55:55,640 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:55:55,640 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:55:55,640 INFO L85 PathProgramCache]: Analyzing trace with hash -500105495, now seen corresponding path program 1 times [2021-11-21 00:55:55,641 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:55:55,641 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [474445522] [2021-11-21 00:55:55,641 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:55:55,641 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:55:55,702 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:55:55,796 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 46 trivial. 0 not checked. [2021-11-21 00:55:55,796 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:55:55,797 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [474445522] [2021-11-21 00:55:55,797 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [474445522] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:55:55,797 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:55:55,797 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-21 00:55:55,797 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1387286656] [2021-11-21 00:55:55,798 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:55:55,799 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-21 00:55:55,799 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:55:55,800 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-21 00:55:55,800 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-21 00:55:55,800 INFO L87 Difference]: Start difference. First operand 130801 states and 195535 transitions. Second operand has 6 states, 6 states have (on average 14.166666666666666) internal successors, (85), 6 states have internal predecessors, (85), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8)