./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/combinations/Problem05_label49+token_ring.08.cil-2.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 0f8a17c6 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3471789f-1822-44d4-8cde-bf9806543163/bin/utaipan-UbGMyvGFUs/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3471789f-1822-44d4-8cde-bf9806543163/bin/utaipan-UbGMyvGFUs/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3471789f-1822-44d4-8cde-bf9806543163/bin/utaipan-UbGMyvGFUs/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3471789f-1822-44d4-8cde-bf9806543163/bin/utaipan-UbGMyvGFUs/config/TaipanReach.xml -i ../../sv-benchmarks/c/combinations/Problem05_label49+token_ring.08.cil-2.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3471789f-1822-44d4-8cde-bf9806543163/bin/utaipan-UbGMyvGFUs/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3471789f-1822-44d4-8cde-bf9806543163/bin/utaipan-UbGMyvGFUs --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 aaf13b6417c3a40bd252c0d41a10a8dacb34259e9c2292b8e82d477fe2508ef5 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-0f8a17c [2021-11-19 13:33:09,804 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-19 13:33:09,806 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-19 13:33:09,858 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-19 13:33:09,859 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-19 13:33:09,860 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-19 13:33:09,862 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-19 13:33:09,864 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-19 13:33:09,867 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-19 13:33:09,868 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-19 13:33:09,869 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-19 13:33:09,871 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-19 13:33:09,871 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-19 13:33:09,873 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-19 13:33:09,874 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-19 13:33:09,876 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-19 13:33:09,878 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-19 13:33:09,879 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-19 13:33:09,881 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-19 13:33:09,884 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-19 13:33:09,887 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-19 13:33:09,888 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-19 13:33:09,890 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-19 13:33:09,891 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-19 13:33:09,895 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-19 13:33:09,896 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-19 13:33:09,897 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-19 13:33:09,898 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-19 13:33:09,898 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-19 13:33:09,900 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-19 13:33:09,900 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-19 13:33:09,901 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-19 13:33:09,903 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-19 13:33:09,904 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-19 13:33:09,905 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-19 13:33:09,906 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-19 13:33:09,907 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-19 13:33:09,907 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-19 13:33:09,908 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-19 13:33:09,909 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-19 13:33:09,910 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-19 13:33:09,911 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3471789f-1822-44d4-8cde-bf9806543163/bin/utaipan-UbGMyvGFUs/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-19 13:33:09,945 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-19 13:33:09,945 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-19 13:33:09,946 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-19 13:33:09,947 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-19 13:33:09,947 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-19 13:33:09,948 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-19 13:33:09,948 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-19 13:33:09,948 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-19 13:33:09,949 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-19 13:33:09,949 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-19 13:33:09,949 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-19 13:33:09,950 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-19 13:33:09,950 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-19 13:33:09,950 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-19 13:33:09,951 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-19 13:33:09,951 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2021-11-19 13:33:09,952 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-19 13:33:09,952 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-19 13:33:09,952 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-19 13:33:09,953 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-19 13:33:09,953 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-19 13:33:09,953 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-19 13:33:09,953 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-19 13:33:09,954 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-19 13:33:09,954 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-19 13:33:09,954 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-19 13:33:09,954 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-19 13:33:09,954 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-19 13:33:09,955 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-19 13:33:09,955 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-19 13:33:09,955 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-19 13:33:09,955 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-19 13:33:09,956 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-19 13:33:09,956 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-19 13:33:09,956 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-19 13:33:09,956 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-19 13:33:09,957 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-19 13:33:09,957 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-19 13:33:09,957 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-19 13:33:09,957 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-19 13:33:09,957 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_3471789f-1822-44d4-8cde-bf9806543163/bin/utaipan-UbGMyvGFUs/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3471789f-1822-44d4-8cde-bf9806543163/bin/utaipan-UbGMyvGFUs Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> aaf13b6417c3a40bd252c0d41a10a8dacb34259e9c2292b8e82d477fe2508ef5 [2021-11-19 13:33:10,276 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-19 13:33:10,297 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-19 13:33:10,300 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-19 13:33:10,301 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-19 13:33:10,302 INFO L275 PluginConnector]: CDTParser initialized [2021-11-19 13:33:10,304 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3471789f-1822-44d4-8cde-bf9806543163/bin/utaipan-UbGMyvGFUs/../../sv-benchmarks/c/combinations/Problem05_label49+token_ring.08.cil-2.c [2021-11-19 13:33:10,379 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3471789f-1822-44d4-8cde-bf9806543163/bin/utaipan-UbGMyvGFUs/data/4110e436e/01d07dab37414325b61648e9464b18e3/FLAG5939f1333 [2021-11-19 13:33:11,483 INFO L306 CDTParser]: Found 1 translation units. [2021-11-19 13:33:11,484 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3471789f-1822-44d4-8cde-bf9806543163/sv-benchmarks/c/combinations/Problem05_label49+token_ring.08.cil-2.c [2021-11-19 13:33:11,539 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3471789f-1822-44d4-8cde-bf9806543163/bin/utaipan-UbGMyvGFUs/data/4110e436e/01d07dab37414325b61648e9464b18e3/FLAG5939f1333 [2021-11-19 13:33:11,742 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3471789f-1822-44d4-8cde-bf9806543163/bin/utaipan-UbGMyvGFUs/data/4110e436e/01d07dab37414325b61648e9464b18e3 [2021-11-19 13:33:11,744 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-19 13:33:11,747 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-19 13:33:11,750 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-19 13:33:11,750 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-19 13:33:11,753 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-19 13:33:11,755 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 01:33:11" (1/1) ... [2021-11-19 13:33:11,756 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6dc38cd2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 01:33:11, skipping insertion in model container [2021-11-19 13:33:11,757 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 01:33:11" (1/1) ... [2021-11-19 13:33:11,764 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-19 13:33:12,053 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-19 13:33:14,483 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_3471789f-1822-44d4-8cde-bf9806543163/sv-benchmarks/c/combinations/Problem05_label49+token_ring.08.cil-2.c[380593,380606] [2021-11-19 13:33:14,543 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_3471789f-1822-44d4-8cde-bf9806543163/sv-benchmarks/c/combinations/Problem05_label49+token_ring.08.cil-2.c[383339,383352] [2021-11-19 13:33:14,834 INFO L207 PostProcessor]: Analyzing one entry point: main [2021-11-19 13:33:14,847 INFO L203 MainTranslator]: Completed pre-run [2021-11-19 13:33:16,101 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_3471789f-1822-44d4-8cde-bf9806543163/sv-benchmarks/c/combinations/Problem05_label49+token_ring.08.cil-2.c[380593,380606] [2021-11-19 13:33:16,106 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_3471789f-1822-44d4-8cde-bf9806543163/sv-benchmarks/c/combinations/Problem05_label49+token_ring.08.cil-2.c[383339,383352] [2021-11-19 13:33:16,139 INFO L207 PostProcessor]: Analyzing one entry point: main [2021-11-19 13:33:16,220 INFO L208 MainTranslator]: Completed translation [2021-11-19 13:33:16,221 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 01:33:16 WrapperNode [2021-11-19 13:33:16,221 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-19 13:33:16,222 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-19 13:33:16,222 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-19 13:33:16,223 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-19 13:33:16,230 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 01:33:16" (1/1) ... [2021-11-19 13:33:16,363 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 01:33:16" (1/1) ... [2021-11-19 13:33:16,878 INFO L137 Inliner]: procedures = 60, calls = 66, calls flagged for inlining = 37, calls inlined = 37, statements flattened = 12972 [2021-11-19 13:33:16,879 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-19 13:33:16,880 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-19 13:33:16,880 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-19 13:33:16,880 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-19 13:33:16,889 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 01:33:16" (1/1) ... [2021-11-19 13:33:16,890 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 01:33:16" (1/1) ... [2021-11-19 13:33:17,046 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 01:33:16" (1/1) ... [2021-11-19 13:33:17,048 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 01:33:16" (1/1) ... [2021-11-19 13:33:17,429 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 01:33:16" (1/1) ... [2021-11-19 13:33:17,509 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 01:33:16" (1/1) ... [2021-11-19 13:33:17,530 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 01:33:16" (1/1) ... [2021-11-19 13:33:17,616 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-19 13:33:17,617 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-19 13:33:17,617 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-19 13:33:17,617 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-19 13:33:17,619 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 01:33:16" (1/1) ... [2021-11-19 13:33:17,626 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-19 13:33:17,636 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3471789f-1822-44d4-8cde-bf9806543163/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 13:33:17,676 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3471789f-1822-44d4-8cde-bf9806543163/bin/utaipan-UbGMyvGFUs/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-19 13:33:17,741 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3471789f-1822-44d4-8cde-bf9806543163/bin/utaipan-UbGMyvGFUs/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-19 13:33:17,772 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-19 13:33:17,772 INFO L130 BoogieDeclarations]: Found specification of procedure activate_threads [2021-11-19 13:33:17,772 INFO L138 BoogieDeclarations]: Found implementation of procedure activate_threads [2021-11-19 13:33:17,772 INFO L130 BoogieDeclarations]: Found specification of procedure immediate_notify [2021-11-19 13:33:17,772 INFO L138 BoogieDeclarations]: Found implementation of procedure immediate_notify [2021-11-19 13:33:17,773 INFO L130 BoogieDeclarations]: Found specification of procedure update_channels [2021-11-19 13:33:17,773 INFO L138 BoogieDeclarations]: Found implementation of procedure update_channels [2021-11-19 13:33:17,773 INFO L130 BoogieDeclarations]: Found specification of procedure error [2021-11-19 13:33:17,773 INFO L138 BoogieDeclarations]: Found implementation of procedure error [2021-11-19 13:33:17,773 INFO L130 BoogieDeclarations]: Found specification of procedure fire_delta_events [2021-11-19 13:33:17,773 INFO L138 BoogieDeclarations]: Found implementation of procedure fire_delta_events [2021-11-19 13:33:17,774 INFO L130 BoogieDeclarations]: Found specification of procedure exists_runnable_thread [2021-11-19 13:33:17,774 INFO L138 BoogieDeclarations]: Found implementation of procedure exists_runnable_thread [2021-11-19 13:33:17,774 INFO L130 BoogieDeclarations]: Found specification of procedure reset_delta_events [2021-11-19 13:33:17,774 INFO L138 BoogieDeclarations]: Found implementation of procedure reset_delta_events [2021-11-19 13:33:17,774 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-19 13:33:17,774 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-19 13:33:17,775 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-19 13:33:17,943 INFO L236 CfgBuilder]: Building ICFG [2021-11-19 13:33:17,945 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-19 13:33:25,505 INFO L277 CfgBuilder]: Performing block encoding [2021-11-19 13:33:27,961 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-19 13:33:27,961 INFO L301 CfgBuilder]: Removed 12 assume(true) statements. [2021-11-19 13:33:27,968 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 01:33:27 BoogieIcfgContainer [2021-11-19 13:33:27,968 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-19 13:33:27,970 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-19 13:33:27,970 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-19 13:33:27,974 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-19 13:33:27,974 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 19.11 01:33:11" (1/3) ... [2021-11-19 13:33:27,975 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@92fe5ca and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 01:33:27, skipping insertion in model container [2021-11-19 13:33:27,975 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 01:33:16" (2/3) ... [2021-11-19 13:33:27,975 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@92fe5ca and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 01:33:27, skipping insertion in model container [2021-11-19 13:33:27,976 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 01:33:27" (3/3) ... [2021-11-19 13:33:27,977 INFO L111 eAbstractionObserver]: Analyzing ICFG Problem05_label49+token_ring.08.cil-2.c [2021-11-19 13:33:27,982 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-19 13:33:27,983 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 2 error locations. [2021-11-19 13:33:28,051 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-19 13:33:28,059 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 [2021-11-19 13:33:28,060 INFO L340 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-11-19 13:33:28,125 INFO L276 IsEmpty]: Start isEmpty. Operand has 1793 states, 1759 states have (on average 1.9641841955656623) internal successors, (3455), 1764 states have internal predecessors, (3455), 24 states have call successors, (24), 7 states have call predecessors, (24), 7 states have return successors, (24), 23 states have call predecessors, (24), 24 states have call successors, (24) [2021-11-19 13:33:28,141 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2021-11-19 13:33:28,141 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 13:33:28,142 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] [2021-11-19 13:33:28,142 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 13:33:28,148 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 13:33:28,148 INFO L85 PathProgramCache]: Analyzing trace with hash 2118186605, now seen corresponding path program 1 times [2021-11-19 13:33:28,158 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 13:33:28,159 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1418907117] [2021-11-19 13:33:28,159 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 13:33:28,160 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 13:33:28,367 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 13:33:28,564 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 13:33:28,565 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 13:33:28,565 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1418907117] [2021-11-19 13:33:28,566 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1418907117] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-19 13:33:28,566 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-19 13:33:28,567 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-19 13:33:28,568 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1363953531] [2021-11-19 13:33:28,569 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-19 13:33:28,573 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-19 13:33:28,573 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 13:33:28,626 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-19 13:33:28,627 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-19 13:33:28,634 INFO L87 Difference]: Start difference. First operand has 1793 states, 1759 states have (on average 1.9641841955656623) internal successors, (3455), 1764 states have internal predecessors, (3455), 24 states have call successors, (24), 7 states have call predecessors, (24), 7 states have return successors, (24), 23 states have call predecessors, (24), 24 states have call successors, (24) Second operand has 4 states, 4 states have (on average 11.25) internal successors, (45), 4 states have internal predecessors, (45), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2021-11-19 13:33:29,712 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 13:33:29,712 INFO L93 Difference]: Finished difference Result 3712 states and 7223 transitions. [2021-11-19 13:33:29,713 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-19 13:33:29,715 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 11.25) internal successors, (45), 4 states have internal predecessors, (45), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) Word has length 56 [2021-11-19 13:33:29,715 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 13:33:29,741 INFO L225 Difference]: With dead ends: 3712 [2021-11-19 13:33:29,741 INFO L226 Difference]: Without dead ends: 1918 [2021-11-19 13:33:29,749 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 [2021-11-19 13:33:29,753 INFO L933 BasicCegarLoop]: 3398 mSDtfsCounter, 3655 mSDsluCounter, 3599 mSDsCounter, 0 mSdLazyCounter, 666 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3655 SdHoareTripleChecker+Valid, 6712 SdHoareTripleChecker+Invalid, 680 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 666 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-19 13:33:29,754 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3655 Valid, 6712 Invalid, 680 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 666 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2021-11-19 13:33:29,780 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1918 states. [2021-11-19 13:33:29,920 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1918 to 1917. [2021-11-19 13:33:29,927 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1917 states, 1861 states have (on average 1.9333691563675444) internal successors, (3598), 1865 states have internal predecessors, (3598), 42 states have call successors, (42), 13 states have call predecessors, (42), 12 states have return successors, (40), 39 states have call predecessors, (40), 40 states have call successors, (40) [2021-11-19 13:33:29,945 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1917 states to 1917 states and 3680 transitions. [2021-11-19 13:33:29,947 INFO L78 Accepts]: Start accepts. Automaton has 1917 states and 3680 transitions. Word has length 56 [2021-11-19 13:33:29,947 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 13:33:29,948 INFO L470 AbstractCegarLoop]: Abstraction has 1917 states and 3680 transitions. [2021-11-19 13:33:29,948 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 11.25) internal successors, (45), 4 states have internal predecessors, (45), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2021-11-19 13:33:29,948 INFO L276 IsEmpty]: Start isEmpty. Operand 1917 states and 3680 transitions. [2021-11-19 13:33:29,958 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2021-11-19 13:33:29,958 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 13:33:29,958 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 13:33:29,959 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-19 13:33:29,959 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 13:33:29,960 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 13:33:29,960 INFO L85 PathProgramCache]: Analyzing trace with hash -1355946959, now seen corresponding path program 1 times [2021-11-19 13:33:29,961 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 13:33:29,961 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [365103540] [2021-11-19 13:33:29,961 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 13:33:29,961 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 13:33:29,993 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 13:33:30,171 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-19 13:33:30,173 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 13:33:30,173 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [365103540] [2021-11-19 13:33:30,174 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [365103540] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 13:33:30,174 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [578581796] [2021-11-19 13:33:30,175 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 13:33:30,175 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 13:33:30,176 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3471789f-1822-44d4-8cde-bf9806543163/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 13:33:30,183 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3471789f-1822-44d4-8cde-bf9806543163/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 13:33:30,195 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3471789f-1822-44d4-8cde-bf9806543163/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-19 13:33:30,387 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 13:33:30,393 INFO L263 TraceCheckSpWp]: Trace formula consists of 775 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-19 13:33:30,412 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 13:33:30,695 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 17 proven. 0 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-19 13:33:30,696 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 13:33:30,959 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-11-19 13:33:30,965 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [578581796] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-19 13:33:30,966 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-19 13:33:30,966 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5, 4] total 7 [2021-11-19 13:33:30,967 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [172444944] [2021-11-19 13:33:30,967 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-19 13:33:30,969 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-19 13:33:30,975 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 13:33:30,975 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-19 13:33:30,976 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-19 13:33:30,976 INFO L87 Difference]: Start difference. First operand 1917 states and 3680 transitions. Second operand has 3 states, 3 states have (on average 25.0) internal successors, (75), 2 states have internal predecessors, (75), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-19 13:33:31,474 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 13:33:31,474 INFO L93 Difference]: Finished difference Result 2452 states and 4499 transitions. [2021-11-19 13:33:31,474 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-19 13:33:31,475 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 25.0) internal successors, (75), 2 states have internal predecessors, (75), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 109 [2021-11-19 13:33:31,475 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 13:33:31,494 INFO L225 Difference]: With dead ends: 2452 [2021-11-19 13:33:31,494 INFO L226 Difference]: Without dead ends: 2181 [2021-11-19 13:33:31,497 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 221 GetRequests, 215 SyntacticMatches, 1 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-19 13:33:31,498 INFO L933 BasicCegarLoop]: 3289 mSDtfsCounter, 3455 mSDsluCounter, 204 mSDsCounter, 0 mSdLazyCounter, 295 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3455 SdHoareTripleChecker+Valid, 3461 SdHoareTripleChecker+Invalid, 297 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 295 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-19 13:33:31,499 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3455 Valid, 3461 Invalid, 297 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 295 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-19 13:33:31,506 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2181 states. [2021-11-19 13:33:31,584 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2181 to 2175. [2021-11-19 13:33:31,589 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2175 states, 2073 states have (on average 1.8876025084418717) internal successors, (3913), 2078 states have internal predecessors, (3913), 76 states have call successors, (76), 25 states have call predecessors, (76), 24 states have return successors, (74), 72 states have call predecessors, (74), 74 states have call successors, (74) [2021-11-19 13:33:31,607 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2175 states to 2175 states and 4063 transitions. [2021-11-19 13:33:31,607 INFO L78 Accepts]: Start accepts. Automaton has 2175 states and 4063 transitions. Word has length 109 [2021-11-19 13:33:31,607 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 13:33:31,608 INFO L470 AbstractCegarLoop]: Abstraction has 2175 states and 4063 transitions. [2021-11-19 13:33:31,608 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 25.0) internal successors, (75), 2 states have internal predecessors, (75), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-19 13:33:31,608 INFO L276 IsEmpty]: Start isEmpty. Operand 2175 states and 4063 transitions. [2021-11-19 13:33:31,621 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2021-11-19 13:33:31,621 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 13:33:31,622 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 13:33:31,655 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3471789f-1822-44d4-8cde-bf9806543163/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-19 13:33:31,835 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3471789f-1822-44d4-8cde-bf9806543163/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 13:33:31,835 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 13:33:31,836 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 13:33:31,836 INFO L85 PathProgramCache]: Analyzing trace with hash 2062193297, now seen corresponding path program 1 times [2021-11-19 13:33:31,836 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 13:33:31,836 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [576677294] [2021-11-19 13:33:31,836 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 13:33:31,836 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 13:33:31,860 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 13:33:31,982 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-19 13:33:31,982 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 13:33:31,982 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [576677294] [2021-11-19 13:33:31,983 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [576677294] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 13:33:31,983 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1392004035] [2021-11-19 13:33:31,983 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 13:33:31,983 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 13:33:31,984 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3471789f-1822-44d4-8cde-bf9806543163/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 13:33:31,984 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3471789f-1822-44d4-8cde-bf9806543163/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 13:33:32,003 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3471789f-1822-44d4-8cde-bf9806543163/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-19 13:33:32,167 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 13:33:32,170 INFO L263 TraceCheckSpWp]: Trace formula consists of 769 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-19 13:33:32,175 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 13:33:32,429 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2021-11-19 13:33:32,429 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 13:33:32,737 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2021-11-19 13:33:32,738 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1392004035] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-19 13:33:32,738 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-19 13:33:32,738 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5, 4] total 7 [2021-11-19 13:33:32,739 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [922844427] [2021-11-19 13:33:32,739 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-19 13:33:32,741 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-19 13:33:32,741 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 13:33:32,742 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-19 13:33:32,742 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-19 13:33:32,743 INFO L87 Difference]: Start difference. First operand 2175 states and 4063 transitions. Second operand has 3 states, 3 states have (on average 22.0) internal successors, (66), 2 states have internal predecessors, (66), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-19 13:33:33,287 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 13:33:33,288 INFO L93 Difference]: Finished difference Result 3220 states and 5658 transitions. [2021-11-19 13:33:33,288 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-19 13:33:33,289 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 22.0) internal successors, (66), 2 states have internal predecessors, (66), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 109 [2021-11-19 13:33:33,289 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 13:33:33,309 INFO L225 Difference]: With dead ends: 3220 [2021-11-19 13:33:33,309 INFO L226 Difference]: Without dead ends: 2691 [2021-11-19 13:33:33,313 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 221 GetRequests, 215 SyntacticMatches, 1 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-19 13:33:33,315 INFO L933 BasicCegarLoop]: 3288 mSDtfsCounter, 3464 mSDsluCounter, 204 mSDsCounter, 0 mSdLazyCounter, 295 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3464 SdHoareTripleChecker+Valid, 3460 SdHoareTripleChecker+Invalid, 297 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 295 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-19 13:33:33,315 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3464 Valid, 3460 Invalid, 297 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 295 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-19 13:33:33,321 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2691 states. [2021-11-19 13:33:33,537 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2691 to 2683. [2021-11-19 13:33:33,544 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2683 states, 2491 states have (on average 1.818948213568848) internal successors, (4531), 2498 states have internal predecessors, (4531), 142 states have call successors, (142), 49 states have call predecessors, (142), 48 states have return successors, (140), 136 states have call predecessors, (140), 140 states have call successors, (140) [2021-11-19 13:33:33,560 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2683 states to 2683 states and 4813 transitions. [2021-11-19 13:33:33,561 INFO L78 Accepts]: Start accepts. Automaton has 2683 states and 4813 transitions. Word has length 109 [2021-11-19 13:33:33,561 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 13:33:33,561 INFO L470 AbstractCegarLoop]: Abstraction has 2683 states and 4813 transitions. [2021-11-19 13:33:33,562 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 22.0) internal successors, (66), 2 states have internal predecessors, (66), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-19 13:33:33,562 INFO L276 IsEmpty]: Start isEmpty. Operand 2683 states and 4813 transitions. [2021-11-19 13:33:33,566 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2021-11-19 13:33:33,566 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 13:33:33,567 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 13:33:33,605 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3471789f-1822-44d4-8cde-bf9806543163/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-19 13:33:33,789 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3471789f-1822-44d4-8cde-bf9806543163/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 13:33:33,789 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 13:33:33,789 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 13:33:33,790 INFO L85 PathProgramCache]: Analyzing trace with hash -1457778639, now seen corresponding path program 1 times [2021-11-19 13:33:33,790 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 13:33:33,790 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [545287925] [2021-11-19 13:33:33,790 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 13:33:33,790 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 13:33:33,818 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 13:33:33,894 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-19 13:33:33,895 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 13:33:33,895 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [545287925] [2021-11-19 13:33:33,898 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [545287925] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 13:33:33,901 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1005138201] [2021-11-19 13:33:33,901 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 13:33:33,902 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 13:33:33,902 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3471789f-1822-44d4-8cde-bf9806543163/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 13:33:33,903 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3471789f-1822-44d4-8cde-bf9806543163/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 13:33:33,916 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3471789f-1822-44d4-8cde-bf9806543163/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-19 13:33:34,094 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 13:33:34,098 INFO L263 TraceCheckSpWp]: Trace formula consists of 763 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-19 13:33:34,103 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 13:33:34,308 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2021-11-19 13:33:34,308 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 13:33:34,550 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-19 13:33:34,551 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1005138201] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-19 13:33:34,551 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-19 13:33:34,551 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5, 4] total 7 [2021-11-19 13:33:34,551 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [922222386] [2021-11-19 13:33:34,551 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-19 13:33:34,552 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-19 13:33:34,552 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 13:33:34,552 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-19 13:33:34,553 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-19 13:33:34,553 INFO L87 Difference]: Start difference. First operand 2683 states and 4813 transitions. Second operand has 3 states, 3 states have (on average 23.0) internal successors, (69), 2 states have internal predecessors, (69), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-19 13:33:35,087 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 13:33:35,087 INFO L93 Difference]: Finished difference Result 4732 states and 7926 transitions. [2021-11-19 13:33:35,088 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-19 13:33:35,088 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 23.0) internal successors, (69), 2 states have internal predecessors, (69), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 109 [2021-11-19 13:33:35,089 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 13:33:35,114 INFO L225 Difference]: With dead ends: 4732 [2021-11-19 13:33:35,115 INFO L226 Difference]: Without dead ends: 3695 [2021-11-19 13:33:35,120 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 221 GetRequests, 215 SyntacticMatches, 1 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-19 13:33:35,121 INFO L933 BasicCegarLoop]: 3253 mSDtfsCounter, 3461 mSDsluCounter, 204 mSDsCounter, 0 mSdLazyCounter, 291 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3461 SdHoareTripleChecker+Valid, 3425 SdHoareTripleChecker+Invalid, 293 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 291 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-19 13:33:35,122 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3461 Valid, 3425 Invalid, 293 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 291 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-19 13:33:35,128 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3695 states. [2021-11-19 13:33:35,256 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3695 to 3683. [2021-11-19 13:33:35,265 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3683 states, 3315 states have (on average 1.7324283559577678) internal successors, (5743), 3326 states have internal predecessors, (5743), 270 states have call successors, (270), 97 states have call predecessors, (270), 96 states have return successors, (268), 260 states have call predecessors, (268), 268 states have call successors, (268) [2021-11-19 13:33:35,284 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3683 states to 3683 states and 6281 transitions. [2021-11-19 13:33:35,285 INFO L78 Accepts]: Start accepts. Automaton has 3683 states and 6281 transitions. Word has length 109 [2021-11-19 13:33:35,285 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 13:33:35,285 INFO L470 AbstractCegarLoop]: Abstraction has 3683 states and 6281 transitions. [2021-11-19 13:33:35,286 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 23.0) internal successors, (69), 2 states have internal predecessors, (69), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-19 13:33:35,286 INFO L276 IsEmpty]: Start isEmpty. Operand 3683 states and 6281 transitions. [2021-11-19 13:33:35,293 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2021-11-19 13:33:35,293 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 13:33:35,293 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 13:33:35,319 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3471789f-1822-44d4-8cde-bf9806543163/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-19 13:33:35,503 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3471789f-1822-44d4-8cde-bf9806543163/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 13:33:35,503 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 13:33:35,504 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 13:33:35,504 INFO L85 PathProgramCache]: Analyzing trace with hash 175404689, now seen corresponding path program 1 times [2021-11-19 13:33:35,504 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 13:33:35,504 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [854548217] [2021-11-19 13:33:35,504 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 13:33:35,505 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 13:33:35,528 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 13:33:35,579 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-19 13:33:35,580 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 13:33:35,580 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [854548217] [2021-11-19 13:33:35,580 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [854548217] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 13:33:35,580 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1948156180] [2021-11-19 13:33:35,580 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 13:33:35,581 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 13:33:35,581 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3471789f-1822-44d4-8cde-bf9806543163/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 13:33:35,582 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3471789f-1822-44d4-8cde-bf9806543163/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 13:33:35,588 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3471789f-1822-44d4-8cde-bf9806543163/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-19 13:33:35,759 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 13:33:35,763 INFO L263 TraceCheckSpWp]: Trace formula consists of 757 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-19 13:33:35,767 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 13:33:35,988 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 23 proven. 0 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-19 13:33:35,989 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 13:33:36,216 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-19 13:33:36,217 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1948156180] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-19 13:33:36,217 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-19 13:33:36,217 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5, 4] total 7 [2021-11-19 13:33:36,217 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [786994337] [2021-11-19 13:33:36,217 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-19 13:33:36,218 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-19 13:33:36,218 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 13:33:36,218 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-19 13:33:36,218 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-19 13:33:36,219 INFO L87 Difference]: Start difference. First operand 3683 states and 6281 transitions. Second operand has 3 states, 3 states have (on average 27.0) internal successors, (81), 2 states have internal predecessors, (81), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-19 13:33:36,775 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 13:33:36,776 INFO L93 Difference]: Finished difference Result 7708 states and 12362 transitions. [2021-11-19 13:33:36,776 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-19 13:33:36,776 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 27.0) internal successors, (81), 2 states have internal predecessors, (81), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 109 [2021-11-19 13:33:36,777 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 13:33:36,815 INFO L225 Difference]: With dead ends: 7708 [2021-11-19 13:33:36,815 INFO L226 Difference]: Without dead ends: 5671 [2021-11-19 13:33:36,825 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 221 GetRequests, 215 SyntacticMatches, 1 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-19 13:33:36,826 INFO L933 BasicCegarLoop]: 3253 mSDtfsCounter, 3449 mSDsluCounter, 204 mSDsCounter, 0 mSdLazyCounter, 291 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3449 SdHoareTripleChecker+Valid, 3425 SdHoareTripleChecker+Invalid, 293 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 291 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-19 13:33:36,826 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3449 Valid, 3425 Invalid, 293 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 291 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-19 13:33:36,835 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5671 states. [2021-11-19 13:33:37,030 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5671 to 5651. [2021-11-19 13:33:37,043 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5651 states, 4939 states have (on average 1.643855031382871) internal successors, (8119), 4958 states have internal predecessors, (8119), 518 states have call successors, (518), 193 states have call predecessors, (518), 192 states have return successors, (516), 500 states have call predecessors, (516), 516 states have call successors, (516) [2021-11-19 13:33:37,063 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5651 states to 5651 states and 9153 transitions. [2021-11-19 13:33:37,064 INFO L78 Accepts]: Start accepts. Automaton has 5651 states and 9153 transitions. Word has length 109 [2021-11-19 13:33:37,065 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 13:33:37,065 INFO L470 AbstractCegarLoop]: Abstraction has 5651 states and 9153 transitions. [2021-11-19 13:33:37,065 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 27.0) internal successors, (81), 2 states have internal predecessors, (81), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-19 13:33:37,065 INFO L276 IsEmpty]: Start isEmpty. Operand 5651 states and 9153 transitions. [2021-11-19 13:33:37,076 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2021-11-19 13:33:37,076 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 13:33:37,076 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 13:33:37,114 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3471789f-1822-44d4-8cde-bf9806543163/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-19 13:33:37,303 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3471789f-1822-44d4-8cde-bf9806543163/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 13:33:37,303 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 13:33:37,303 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 13:33:37,303 INFO L85 PathProgramCache]: Analyzing trace with hash -747934479, now seen corresponding path program 1 times [2021-11-19 13:33:37,304 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 13:33:37,304 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1138319627] [2021-11-19 13:33:37,304 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 13:33:37,304 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 13:33:37,332 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 13:33:37,371 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 31 trivial. 0 not checked. [2021-11-19 13:33:37,371 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 13:33:37,371 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1138319627] [2021-11-19 13:33:37,372 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1138319627] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-19 13:33:37,372 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-19 13:33:37,372 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-19 13:33:37,372 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [644877813] [2021-11-19 13:33:37,372 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-19 13:33:37,373 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-19 13:33:37,373 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 13:33:37,373 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-19 13:33:37,374 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-19 13:33:37,374 INFO L87 Difference]: Start difference. First operand 5651 states and 9153 transitions. Second operand has 3 states, 3 states have (on average 21.0) internal successors, (63), 3 states have internal predecessors, (63), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2021-11-19 13:33:38,220 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 13:33:38,220 INFO L93 Difference]: Finished difference Result 8775 states and 13908 transitions. [2021-11-19 13:33:38,221 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-19 13:33:38,221 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 21.0) internal successors, (63), 3 states have internal predecessors, (63), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) Word has length 109 [2021-11-19 13:33:38,224 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 13:33:38,296 INFO L225 Difference]: With dead ends: 8775 [2021-11-19 13:33:38,297 INFO L226 Difference]: Without dead ends: 6707 [2021-11-19 13:33:38,304 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-19 13:33:38,306 INFO L933 BasicCegarLoop]: 3331 mSDtfsCounter, 91 mSDsluCounter, 3490 mSDsCounter, 0 mSdLazyCounter, 522 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 91 SdHoareTripleChecker+Valid, 6576 SdHoareTripleChecker+Invalid, 522 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 522 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-19 13:33:38,306 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [91 Valid, 6576 Invalid, 522 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 522 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-19 13:33:38,316 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6707 states. [2021-11-19 13:33:38,566 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6707 to 6371. [2021-11-19 13:33:38,593 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 6371 states, 5627 states have (on average 1.6532788341922873) internal successors, (9303), 5646 states have internal predecessors, (9303), 534 states have call successors, (534), 209 states have call predecessors, (534), 208 states have return successors, (532), 516 states have call predecessors, (532), 532 states have call successors, (532) [2021-11-19 13:33:38,615 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6371 states to 6371 states and 10369 transitions. [2021-11-19 13:33:38,616 INFO L78 Accepts]: Start accepts. Automaton has 6371 states and 10369 transitions. Word has length 109 [2021-11-19 13:33:38,617 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 13:33:38,617 INFO L470 AbstractCegarLoop]: Abstraction has 6371 states and 10369 transitions. [2021-11-19 13:33:38,618 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 21.0) internal successors, (63), 3 states have internal predecessors, (63), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2021-11-19 13:33:38,618 INFO L276 IsEmpty]: Start isEmpty. Operand 6371 states and 10369 transitions. [2021-11-19 13:33:38,640 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 148 [2021-11-19 13:33:38,640 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 13:33:38,640 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 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] [2021-11-19 13:33:38,641 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-11-19 13:33:38,643 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 13:33:38,643 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 13:33:38,644 INFO L85 PathProgramCache]: Analyzing trace with hash -1440315102, now seen corresponding path program 1 times [2021-11-19 13:33:38,644 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 13:33:38,644 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [686603553] [2021-11-19 13:33:38,644 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 13:33:38,644 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 13:33:38,698 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 13:33:38,747 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 90 trivial. 0 not checked. [2021-11-19 13:33:38,747 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 13:33:38,747 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [686603553] [2021-11-19 13:33:38,747 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [686603553] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-19 13:33:38,747 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-19 13:33:38,748 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-19 13:33:38,748 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [242566129] [2021-11-19 13:33:38,748 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-19 13:33:38,749 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-19 13:33:38,749 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 13:33:38,749 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-19 13:33:38,750 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-19 13:33:38,750 INFO L87 Difference]: Start difference. First operand 6371 states and 10369 transitions. Second operand has 3 states, 3 states have (on average 23.333333333333332) internal successors, (70), 3 states have internal predecessors, (70), 3 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-19 13:33:39,464 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 13:33:39,464 INFO L93 Difference]: Finished difference Result 15676 states and 24586 transitions. [2021-11-19 13:33:39,465 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-19 13:33:39,465 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 23.333333333333332) internal successors, (70), 3 states have internal predecessors, (70), 3 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 147 [2021-11-19 13:33:39,466 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 13:33:39,509 INFO L225 Difference]: With dead ends: 15676 [2021-11-19 13:33:39,509 INFO L226 Difference]: Without dead ends: 10951 [2021-11-19 13:33:39,529 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-19 13:33:39,530 INFO L933 BasicCegarLoop]: 3255 mSDtfsCounter, 3451 mSDsluCounter, 204 mSDsCounter, 0 mSdLazyCounter, 289 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3451 SdHoareTripleChecker+Valid, 3427 SdHoareTripleChecker+Invalid, 291 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 289 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-19 13:33:39,530 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3451 Valid, 3427 Invalid, 291 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 289 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-19 13:33:39,547 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10951 states. [2021-11-19 13:33:39,966 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10951 to 10899. [2021-11-19 13:33:39,984 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 10899 states, 9451 states have (on average 1.5887207702888584) internal successors, (15015), 9486 states have internal predecessors, (15015), 1030 states have call successors, (1030), 417 states have call predecessors, (1030), 416 states have return successors, (1028), 996 states have call predecessors, (1028), 1028 states have call successors, (1028) [2021-11-19 13:33:40,027 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10899 states to 10899 states and 17073 transitions. [2021-11-19 13:33:40,030 INFO L78 Accepts]: Start accepts. Automaton has 10899 states and 17073 transitions. Word has length 147 [2021-11-19 13:33:40,031 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 13:33:40,032 INFO L470 AbstractCegarLoop]: Abstraction has 10899 states and 17073 transitions. [2021-11-19 13:33:40,032 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 23.333333333333332) internal successors, (70), 3 states have internal predecessors, (70), 3 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-19 13:33:40,032 INFO L276 IsEmpty]: Start isEmpty. Operand 10899 states and 17073 transitions. [2021-11-19 13:33:40,067 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 148 [2021-11-19 13:33:40,067 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 13:33:40,068 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 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] [2021-11-19 13:33:40,068 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-11-19 13:33:40,068 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 13:33:40,069 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 13:33:40,069 INFO L85 PathProgramCache]: Analyzing trace with hash -1578492942, now seen corresponding path program 1 times [2021-11-19 13:33:40,069 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 13:33:40,069 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [863709474] [2021-11-19 13:33:40,069 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 13:33:40,070 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 13:33:40,121 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 13:33:40,189 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 90 trivial. 0 not checked. [2021-11-19 13:33:40,193 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 13:33:40,193 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [863709474] [2021-11-19 13:33:40,194 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [863709474] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-19 13:33:40,194 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-19 13:33:40,194 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-19 13:33:40,194 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [732781548] [2021-11-19 13:33:40,194 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-19 13:33:40,195 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-19 13:33:40,195 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 13:33:40,195 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-19 13:33:40,196 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-19 13:33:40,196 INFO L87 Difference]: Start difference. First operand 10899 states and 17073 transitions. Second operand has 3 states, 3 states have (on average 23.333333333333332) internal successors, (70), 3 states have internal predecessors, (70), 3 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-19 13:33:41,405 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 13:33:41,405 INFO L93 Difference]: Finished difference Result 29116 states and 44698 transitions. [2021-11-19 13:33:41,406 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-19 13:33:41,406 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 23.333333333333332) internal successors, (70), 3 states have internal predecessors, (70), 3 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 147 [2021-11-19 13:33:41,407 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 13:33:41,500 INFO L225 Difference]: With dead ends: 29116 [2021-11-19 13:33:41,501 INFO L226 Difference]: Without dead ends: 19863 [2021-11-19 13:33:41,543 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-19 13:33:41,544 INFO L933 BasicCegarLoop]: 3255 mSDtfsCounter, 3453 mSDsluCounter, 204 mSDsCounter, 0 mSdLazyCounter, 289 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3453 SdHoareTripleChecker+Valid, 3427 SdHoareTripleChecker+Invalid, 291 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 289 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-19 13:33:41,544 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3453 Valid, 3427 Invalid, 291 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 289 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-19 13:33:41,573 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19863 states. [2021-11-19 13:33:42,461 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19863 to 19763. [2021-11-19 13:33:42,496 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19763 states, 16939 states have (on average 1.5419446248302733) internal successors, (26119), 17006 states have internal predecessors, (26119), 1990 states have call successors, (1990), 833 states have call predecessors, (1990), 832 states have return successors, (1988), 1924 states have call predecessors, (1988), 1988 states have call successors, (1988) [2021-11-19 13:33:42,589 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19763 states to 19763 states and 30097 transitions. [2021-11-19 13:33:42,591 INFO L78 Accepts]: Start accepts. Automaton has 19763 states and 30097 transitions. Word has length 147 [2021-11-19 13:33:42,592 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 13:33:42,592 INFO L470 AbstractCegarLoop]: Abstraction has 19763 states and 30097 transitions. [2021-11-19 13:33:42,592 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 23.333333333333332) internal successors, (70), 3 states have internal predecessors, (70), 3 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-19 13:33:42,593 INFO L276 IsEmpty]: Start isEmpty. Operand 19763 states and 30097 transitions. [2021-11-19 13:33:42,665 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 148 [2021-11-19 13:33:42,665 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 13:33:42,666 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 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] [2021-11-19 13:33:42,666 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-11-19 13:33:42,666 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 13:33:42,667 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 13:33:42,667 INFO L85 PathProgramCache]: Analyzing trace with hash -579036697, now seen corresponding path program 1 times [2021-11-19 13:33:42,667 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 13:33:42,667 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [610880985] [2021-11-19 13:33:42,667 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 13:33:42,668 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 13:33:42,705 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 13:33:42,765 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 90 trivial. 0 not checked. [2021-11-19 13:33:42,766 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 13:33:42,766 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [610880985] [2021-11-19 13:33:42,766 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [610880985] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-19 13:33:42,766 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-19 13:33:42,766 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-19 13:33:42,767 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1205561672] [2021-11-19 13:33:42,767 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-19 13:33:42,767 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-19 13:33:42,768 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 13:33:42,768 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-19 13:33:42,768 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-19 13:33:42,769 INFO L87 Difference]: Start difference. First operand 19763 states and 30097 transitions. Second operand has 3 states, 3 states have (on average 23.333333333333332) internal successors, (70), 3 states have internal predecessors, (70), 3 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-19 13:33:44,379 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 13:33:44,380 INFO L93 Difference]: Finished difference Result 55420 states and 83738 transitions. [2021-11-19 13:33:44,380 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-19 13:33:44,381 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 23.333333333333332) internal successors, (70), 3 states have internal predecessors, (70), 3 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 147 [2021-11-19 13:33:44,381 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 13:33:44,565 INFO L225 Difference]: With dead ends: 55420 [2021-11-19 13:33:44,566 INFO L226 Difference]: Without dead ends: 37303 [2021-11-19 13:33:44,648 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-19 13:33:44,651 INFO L933 BasicCegarLoop]: 3255 mSDtfsCounter, 3455 mSDsluCounter, 204 mSDsCounter, 0 mSdLazyCounter, 289 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3455 SdHoareTripleChecker+Valid, 3427 SdHoareTripleChecker+Invalid, 291 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 289 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-19 13:33:44,651 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3455 Valid, 3427 Invalid, 291 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 289 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-19 13:33:44,697 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37303 states. [2021-11-19 13:33:45,934 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37303 to 37107. [2021-11-19 13:33:45,996 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37107 states, 31595 states have (on average 1.5093210951099858) internal successors, (47687), 31726 states have internal predecessors, (47687), 3846 states have call successors, (3846), 1665 states have call predecessors, (3846), 1664 states have return successors, (3844), 3716 states have call predecessors, (3844), 3844 states have call successors, (3844) [2021-11-19 13:33:46,129 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37107 states to 37107 states and 55377 transitions. [2021-11-19 13:33:46,134 INFO L78 Accepts]: Start accepts. Automaton has 37107 states and 55377 transitions. Word has length 147 [2021-11-19 13:33:46,135 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 13:33:46,135 INFO L470 AbstractCegarLoop]: Abstraction has 37107 states and 55377 transitions. [2021-11-19 13:33:46,135 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 23.333333333333332) internal successors, (70), 3 states have internal predecessors, (70), 3 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-19 13:33:46,135 INFO L276 IsEmpty]: Start isEmpty. Operand 37107 states and 55377 transitions. [2021-11-19 13:33:46,247 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 148 [2021-11-19 13:33:46,248 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 13:33:46,248 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 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] [2021-11-19 13:33:46,248 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-11-19 13:33:46,248 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 13:33:46,249 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 13:33:46,249 INFO L85 PathProgramCache]: Analyzing trace with hash -1289534879, now seen corresponding path program 1 times [2021-11-19 13:33:46,249 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 13:33:46,249 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [876035094] [2021-11-19 13:33:46,250 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 13:33:46,250 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 13:33:46,299 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 13:33:46,345 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 90 trivial. 0 not checked. [2021-11-19 13:33:46,345 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 13:33:46,345 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [876035094] [2021-11-19 13:33:46,346 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [876035094] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-19 13:33:46,346 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-19 13:33:46,346 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-19 13:33:46,346 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [606483613] [2021-11-19 13:33:46,346 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-19 13:33:46,347 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-19 13:33:46,347 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 13:33:46,347 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-19 13:33:46,348 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-19 13:33:46,348 INFO L87 Difference]: Start difference. First operand 37107 states and 55377 transitions. Second operand has 3 states, 3 states have (on average 23.333333333333332) internal successors, (70), 3 states have internal predecessors, (70), 3 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-19 13:33:49,174 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 13:33:49,175 INFO L93 Difference]: Finished difference Result 106876 states and 159450 transitions. [2021-11-19 13:33:49,175 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-19 13:33:49,175 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 23.333333333333332) internal successors, (70), 3 states have internal predecessors, (70), 3 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 147 [2021-11-19 13:33:49,180 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 13:33:49,591 INFO L225 Difference]: With dead ends: 106876 [2021-11-19 13:33:49,592 INFO L226 Difference]: Without dead ends: 71415 [2021-11-19 13:33:49,700 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-19 13:33:49,701 INFO L933 BasicCegarLoop]: 3270 mSDtfsCounter, 3458 mSDsluCounter, 204 mSDsCounter, 0 mSdLazyCounter, 290 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3458 SdHoareTripleChecker+Valid, 3442 SdHoareTripleChecker+Invalid, 292 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 290 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-19 13:33:49,702 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3458 Valid, 3442 Invalid, 292 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 290 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-19 13:33:49,777 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71415 states. [2021-11-19 13:33:52,291 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71415 to 71027. [2021-11-19 13:33:52,372 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 71027 states, 60267 states have (on average 1.485771649493089) internal successors, (89543), 60526 states have internal predecessors, (89543), 7430 states have call successors, (7430), 3329 states have call predecessors, (7430), 3328 states have return successors, (7428), 7172 states have call predecessors, (7428), 7428 states have call successors, (7428) [2021-11-19 13:33:52,897 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71027 states to 71027 states and 104401 transitions. [2021-11-19 13:33:52,910 INFO L78 Accepts]: Start accepts. Automaton has 71027 states and 104401 transitions. Word has length 147 [2021-11-19 13:33:52,910 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 13:33:52,911 INFO L470 AbstractCegarLoop]: Abstraction has 71027 states and 104401 transitions. [2021-11-19 13:33:52,911 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 23.333333333333332) internal successors, (70), 3 states have internal predecessors, (70), 3 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-19 13:33:52,911 INFO L276 IsEmpty]: Start isEmpty. Operand 71027 states and 104401 transitions. [2021-11-19 13:33:53,484 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 169 [2021-11-19 13:33:53,484 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 13:33:53,484 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 13:33:53,485 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2021-11-19 13:33:53,485 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 13:33:53,486 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 13:33:53,486 INFO L85 PathProgramCache]: Analyzing trace with hash 1938494326, now seen corresponding path program 1 times [2021-11-19 13:33:53,486 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 13:33:53,486 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1416384554] [2021-11-19 13:33:53,499 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 13:33:53,499 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 13:33:53,528 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 13:33:53,594 INFO L134 CoverageAnalysis]: Checked inductivity of 122 backedges. 28 proven. 0 refuted. 0 times theorem prover too weak. 94 trivial. 0 not checked. [2021-11-19 13:33:53,594 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 13:33:53,594 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1416384554] [2021-11-19 13:33:53,594 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1416384554] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-19 13:33:53,594 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-19 13:33:53,595 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-19 13:33:53,595 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1850919593] [2021-11-19 13:33:53,595 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-19 13:33:53,596 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-19 13:33:53,596 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 13:33:53,597 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-19 13:33:53,597 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-19 13:33:53,597 INFO L87 Difference]: Start difference. First operand 71027 states and 104401 transitions. Second operand has 3 states, 3 states have (on average 29.333333333333332) internal successors, (88), 3 states have internal predecessors, (88), 3 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2021-11-19 13:33:57,320 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 13:33:57,320 INFO L93 Difference]: Finished difference Result 184187 states and 274647 transitions. [2021-11-19 13:33:57,321 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-19 13:33:57,321 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 29.333333333333332) internal successors, (88), 3 states have internal predecessors, (88), 3 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) Word has length 168 [2021-11-19 13:33:57,321 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 13:33:58,145 INFO L225 Difference]: With dead ends: 184187 [2021-11-19 13:33:58,146 INFO L226 Difference]: Without dead ends: 114807 [2021-11-19 13:33:58,338 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-19 13:33:58,339 INFO L933 BasicCegarLoop]: 3285 mSDtfsCounter, 109 mSDsluCounter, 3486 mSDsCounter, 0 mSdLazyCounter, 505 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 109 SdHoareTripleChecker+Valid, 6528 SdHoareTripleChecker+Invalid, 508 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 505 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-19 13:33:58,340 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [109 Valid, 6528 Invalid, 508 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 505 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-19 13:33:58,463 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114807 states. [2021-11-19 13:34:02,723 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114807 to 100731. [2021-11-19 13:34:02,809 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 100731 states, 88431 states have (on average 1.551073718492384) internal successors, (137163), 88691 states have internal predecessors, (137163), 8200 states have call successors, (8200), 4099 states have call predecessors, (8200), 4098 states have return successors, (8198), 7941 states have call predecessors, (8198), 8198 states have call successors, (8198) [2021-11-19 13:34:03,500 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100731 states to 100731 states and 153561 transitions. [2021-11-19 13:34:03,518 INFO L78 Accepts]: Start accepts. Automaton has 100731 states and 153561 transitions. Word has length 168 [2021-11-19 13:34:03,519 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 13:34:03,519 INFO L470 AbstractCegarLoop]: Abstraction has 100731 states and 153561 transitions. [2021-11-19 13:34:03,519 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 29.333333333333332) internal successors, (88), 3 states have internal predecessors, (88), 3 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2021-11-19 13:34:03,519 INFO L276 IsEmpty]: Start isEmpty. Operand 100731 states and 153561 transitions. [2021-11-19 13:34:03,765 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 169 [2021-11-19 13:34:03,765 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 13:34:03,766 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 13:34:03,766 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2021-11-19 13:34:03,767 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 13:34:03,767 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 13:34:03,767 INFO L85 PathProgramCache]: Analyzing trace with hash 308881740, now seen corresponding path program 2 times [2021-11-19 13:34:03,767 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 13:34:03,768 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [205878890] [2021-11-19 13:34:03,768 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 13:34:03,768 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 13:34:03,805 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 13:34:03,905 INFO L134 CoverageAnalysis]: Checked inductivity of 122 backedges. 15 proven. 59 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2021-11-19 13:34:03,905 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 13:34:03,905 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [205878890] [2021-11-19 13:34:03,906 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [205878890] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 13:34:03,906 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [228104733] [2021-11-19 13:34:03,906 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-19 13:34:03,906 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 13:34:03,906 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3471789f-1822-44d4-8cde-bf9806543163/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 13:34:03,911 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3471789f-1822-44d4-8cde-bf9806543163/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 13:34:03,912 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3471789f-1822-44d4-8cde-bf9806543163/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-19 13:34:04,088 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-11-19 13:34:04,088 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-19 13:34:04,092 INFO L263 TraceCheckSpWp]: Trace formula consists of 648 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-19 13:34:04,097 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 13:34:04,449 INFO L134 CoverageAnalysis]: Checked inductivity of 122 backedges. 76 proven. 0 refuted. 0 times theorem prover too weak. 46 trivial. 0 not checked. [2021-11-19 13:34:04,449 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 13:34:04,792 INFO L134 CoverageAnalysis]: Checked inductivity of 122 backedges. 21 proven. 0 refuted. 0 times theorem prover too weak. 101 trivial. 0 not checked. [2021-11-19 13:34:04,793 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [228104733] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-19 13:34:04,793 INFO L186 FreeRefinementEngine]: Found 2 perfect and 1 imperfect interpolant sequences. [2021-11-19 13:34:04,793 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 4] imperfect sequences [6] total 8 [2021-11-19 13:34:04,795 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [743236330] [2021-11-19 13:34:04,796 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-19 13:34:04,797 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-19 13:34:04,797 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 13:34:04,798 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-19 13:34:04,798 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2021-11-19 13:34:04,798 INFO L87 Difference]: Start difference. First operand 100731 states and 153561 transitions. Second operand has 4 states, 4 states have (on average 27.75) internal successors, (111), 4 states have internal predecessors, (111), 3 states have call successors, (13), 3 states have call predecessors, (13), 3 states have return successors, (13), 3 states have call predecessors, (13), 3 states have call successors, (13) [2021-11-19 13:34:08,349 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 13:34:08,349 INFO L93 Difference]: Finished difference Result 151683 states and 233439 transitions. [2021-11-19 13:34:08,349 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-19 13:34:08,350 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 27.75) internal successors, (111), 4 states have internal predecessors, (111), 3 states have call successors, (13), 3 states have call predecessors, (13), 3 states have return successors, (13), 3 states have call predecessors, (13), 3 states have call successors, (13) Word has length 168 [2021-11-19 13:34:08,350 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 13:34:08,663 INFO L225 Difference]: With dead ends: 151683 [2021-11-19 13:34:08,664 INFO L226 Difference]: Without dead ends: 100991 [2021-11-19 13:34:08,756 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 348 GetRequests, 342 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2021-11-19 13:34:08,757 INFO L933 BasicCegarLoop]: 3402 mSDtfsCounter, 3652 mSDsluCounter, 3598 mSDsCounter, 0 mSdLazyCounter, 654 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3652 SdHoareTripleChecker+Valid, 6722 SdHoareTripleChecker+Invalid, 659 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 654 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-19 13:34:08,757 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3652 Valid, 6722 Invalid, 659 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 654 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-19 13:34:08,878 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100991 states. [2021-11-19 13:34:12,584 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100991 to 99707. [2021-11-19 13:34:12,663 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 99707 states, 87407 states have (on average 1.5370279268250826) internal successors, (134347), 87667 states have internal predecessors, (134347), 8200 states have call successors, (8200), 4099 states have call predecessors, (8200), 4098 states have return successors, (8198), 7941 states have call predecessors, (8198), 8198 states have call successors, (8198) [2021-11-19 13:34:13,039 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99707 states to 99707 states and 150745 transitions. [2021-11-19 13:34:13,053 INFO L78 Accepts]: Start accepts. Automaton has 99707 states and 150745 transitions. Word has length 168 [2021-11-19 13:34:13,054 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 13:34:13,054 INFO L470 AbstractCegarLoop]: Abstraction has 99707 states and 150745 transitions. [2021-11-19 13:34:13,054 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 27.75) internal successors, (111), 4 states have internal predecessors, (111), 3 states have call successors, (13), 3 states have call predecessors, (13), 3 states have return successors, (13), 3 states have call predecessors, (13), 3 states have call successors, (13) [2021-11-19 13:34:13,055 INFO L276 IsEmpty]: Start isEmpty. Operand 99707 states and 150745 transitions. [2021-11-19 13:34:13,297 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 169 [2021-11-19 13:34:13,297 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 13:34:13,297 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 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] [2021-11-19 13:34:13,339 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3471789f-1822-44d4-8cde-bf9806543163/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-19 13:34:13,511 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3471789f-1822-44d4-8cde-bf9806543163/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 13:34:13,511 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 13:34:13,512 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 13:34:13,512 INFO L85 PathProgramCache]: Analyzing trace with hash 1282370699, now seen corresponding path program 1 times [2021-11-19 13:34:13,512 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 13:34:13,512 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [359771139] [2021-11-19 13:34:13,512 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 13:34:13,512 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 13:34:13,546 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 13:34:13,670 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 15 proven. 57 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2021-11-19 13:34:13,671 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 13:34:13,671 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [359771139] [2021-11-19 13:34:13,671 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [359771139] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 13:34:13,671 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [852798462] [2021-11-19 13:34:13,671 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 13:34:13,672 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 13:34:13,672 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3471789f-1822-44d4-8cde-bf9806543163/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 13:34:13,675 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3471789f-1822-44d4-8cde-bf9806543163/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 13:34:13,678 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3471789f-1822-44d4-8cde-bf9806543163/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-19 13:34:13,882 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 13:34:13,887 INFO L263 TraceCheckSpWp]: Trace formula consists of 997 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-19 13:34:13,891 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 13:34:14,214 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 91 proven. 0 refuted. 0 times theorem prover too weak. 29 trivial. 0 not checked. [2021-11-19 13:34:14,214 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 13:34:14,517 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 28 proven. 0 refuted. 0 times theorem prover too weak. 92 trivial. 0 not checked. [2021-11-19 13:34:14,517 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [852798462] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-19 13:34:14,517 INFO L186 FreeRefinementEngine]: Found 2 perfect and 1 imperfect interpolant sequences. [2021-11-19 13:34:14,518 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [6] total 8 [2021-11-19 13:34:14,518 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1090170222] [2021-11-19 13:34:14,518 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-19 13:34:14,519 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-19 13:34:14,519 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 13:34:14,519 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-19 13:34:14,520 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2021-11-19 13:34:14,520 INFO L87 Difference]: Start difference. First operand 99707 states and 150745 transitions. Second operand has 4 states, 4 states have (on average 33.5) internal successors, (134), 4 states have internal predecessors, (134), 4 states have call successors, (15), 3 states have call predecessors, (15), 3 states have return successors, (14), 4 states have call predecessors, (14), 4 states have call successors, (14) [2021-11-19 13:34:19,221 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 13:34:19,222 INFO L93 Difference]: Finished difference Result 199683 states and 301535 transitions. [2021-11-19 13:34:19,222 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-19 13:34:19,222 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 33.5) internal successors, (134), 4 states have internal predecessors, (134), 4 states have call successors, (15), 3 states have call predecessors, (15), 3 states have return successors, (14), 4 states have call predecessors, (14), 4 states have call successors, (14) Word has length 168 [2021-11-19 13:34:19,223 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 13:34:19,632 INFO L225 Difference]: With dead ends: 199683 [2021-11-19 13:34:19,632 INFO L226 Difference]: Without dead ends: 150527 [2021-11-19 13:34:19,716 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 348 GetRequests, 342 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2021-11-19 13:34:19,716 INFO L933 BasicCegarLoop]: 3384 mSDtfsCounter, 334 mSDsluCounter, 3543 mSDsCounter, 0 mSdLazyCounter, 539 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 334 SdHoareTripleChecker+Valid, 6675 SdHoareTripleChecker+Invalid, 557 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 539 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-19 13:34:19,717 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [334 Valid, 6675 Invalid, 557 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 539 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-19 13:34:19,828 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 150527 states.