./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/combinations/Problem05_label43+token_ring.15.cil.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_57beaffc-a6fc-4002-af26-360773f10f56/bin/utaipan-UbGMyvGFUs/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57beaffc-a6fc-4002-af26-360773f10f56/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_57beaffc-a6fc-4002-af26-360773f10f56/bin/utaipan-UbGMyvGFUs/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57beaffc-a6fc-4002-af26-360773f10f56/bin/utaipan-UbGMyvGFUs/config/TaipanReach.xml -i ../../sv-benchmarks/c/combinations/Problem05_label43+token_ring.15.cil.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57beaffc-a6fc-4002-af26-360773f10f56/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_57beaffc-a6fc-4002-af26-360773f10f56/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 eebc57bb84d5e49c07b21e35f27ee095cb699b6ae996e22651132239fcb21755 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-0f8a17c [2021-11-19 15:47:59,776 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-19 15:47:59,778 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-19 15:47:59,826 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-19 15:47:59,827 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-19 15:47:59,828 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-19 15:47:59,830 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-19 15:47:59,833 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-19 15:47:59,836 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-19 15:47:59,837 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-19 15:47:59,838 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-19 15:47:59,840 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-19 15:47:59,841 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-19 15:47:59,842 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-19 15:47:59,844 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-19 15:47:59,846 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-19 15:47:59,847 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-19 15:47:59,848 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-19 15:47:59,851 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-19 15:47:59,854 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-19 15:47:59,856 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-19 15:47:59,864 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-19 15:47:59,866 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-19 15:47:59,868 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-19 15:47:59,875 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-19 15:47:59,875 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-19 15:47:59,876 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-19 15:47:59,877 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-19 15:47:59,878 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-19 15:47:59,880 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-19 15:47:59,880 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-19 15:47:59,882 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-19 15:47:59,883 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-19 15:47:59,884 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-19 15:47:59,886 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-19 15:47:59,886 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-19 15:47:59,888 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-19 15:47:59,888 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-19 15:47:59,889 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-19 15:47:59,890 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-19 15:47:59,891 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-19 15:47:59,892 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57beaffc-a6fc-4002-af26-360773f10f56/bin/utaipan-UbGMyvGFUs/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-19 15:47:59,939 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-19 15:47:59,940 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-19 15:47:59,942 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-19 15:47:59,942 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-19 15:47:59,942 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-19 15:47:59,942 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-19 15:47:59,943 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-19 15:47:59,943 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-19 15:47:59,943 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-19 15:47:59,943 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-19 15:47:59,944 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-19 15:47:59,945 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-19 15:47:59,945 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-19 15:47:59,945 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-19 15:47:59,945 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-19 15:47:59,946 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2021-11-19 15:47:59,947 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-19 15:47:59,947 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-19 15:47:59,947 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-19 15:47:59,947 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-19 15:47:59,947 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-19 15:47:59,948 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-19 15:47:59,948 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-19 15:47:59,948 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-19 15:47:59,948 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-19 15:47:59,948 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-19 15:47:59,949 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-19 15:47:59,949 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-19 15:47:59,949 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-19 15:47:59,951 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-19 15:47:59,951 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-19 15:47:59,951 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-19 15:47:59,952 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-19 15:47:59,952 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-19 15:47:59,952 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-19 15:47:59,953 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-19 15:47:59,953 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-19 15:47:59,953 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-19 15:47:59,953 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-19 15:47:59,953 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-19 15:47:59,954 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_57beaffc-a6fc-4002-af26-360773f10f56/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57beaffc-a6fc-4002-af26-360773f10f56/bin/utaipan-UbGMyvGFUs Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> eebc57bb84d5e49c07b21e35f27ee095cb699b6ae996e22651132239fcb21755 [2021-11-19 15:48:00,248 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-19 15:48:00,286 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-19 15:48:00,291 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-19 15:48:00,292 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-19 15:48:00,293 INFO L275 PluginConnector]: CDTParser initialized [2021-11-19 15:48:00,295 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57beaffc-a6fc-4002-af26-360773f10f56/bin/utaipan-UbGMyvGFUs/../../sv-benchmarks/c/combinations/Problem05_label43+token_ring.15.cil.c [2021-11-19 15:48:00,386 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57beaffc-a6fc-4002-af26-360773f10f56/bin/utaipan-UbGMyvGFUs/data/2903954ab/a5c819fdb86d45269b1ad5bc37c00ee8/FLAG6f9ce1950 [2021-11-19 15:48:01,723 INFO L306 CDTParser]: Found 1 translation units. [2021-11-19 15:48:01,725 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57beaffc-a6fc-4002-af26-360773f10f56/sv-benchmarks/c/combinations/Problem05_label43+token_ring.15.cil.c [2021-11-19 15:48:01,816 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57beaffc-a6fc-4002-af26-360773f10f56/bin/utaipan-UbGMyvGFUs/data/2903954ab/a5c819fdb86d45269b1ad5bc37c00ee8/FLAG6f9ce1950 [2021-11-19 15:48:01,888 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57beaffc-a6fc-4002-af26-360773f10f56/bin/utaipan-UbGMyvGFUs/data/2903954ab/a5c819fdb86d45269b1ad5bc37c00ee8 [2021-11-19 15:48:01,891 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-19 15:48:01,895 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-19 15:48:01,897 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-19 15:48:01,899 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-19 15:48:01,903 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-19 15:48:01,905 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 03:48:01" (1/1) ... [2021-11-19 15:48:01,906 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@238e4c0f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 03:48:01, skipping insertion in model container [2021-11-19 15:48:01,906 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 03:48:01" (1/1) ... [2021-11-19 15:48:01,916 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-19 15:48:02,224 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-19 15:48:05,097 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_57beaffc-a6fc-4002-af26-360773f10f56/sv-benchmarks/c/combinations/Problem05_label43+token_ring.15.cil.c[381679,381692] [2021-11-19 15:48:05,131 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_57beaffc-a6fc-4002-af26-360773f10f56/sv-benchmarks/c/combinations/Problem05_label43+token_ring.15.cil.c[383339,383352] [2021-11-19 15:48:05,598 INFO L207 PostProcessor]: Analyzing one entry point: main [2021-11-19 15:48:05,617 INFO L203 MainTranslator]: Completed pre-run [2021-11-19 15:48:07,013 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_57beaffc-a6fc-4002-af26-360773f10f56/sv-benchmarks/c/combinations/Problem05_label43+token_ring.15.cil.c[381679,381692] [2021-11-19 15:48:07,018 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_57beaffc-a6fc-4002-af26-360773f10f56/sv-benchmarks/c/combinations/Problem05_label43+token_ring.15.cil.c[383339,383352] [2021-11-19 15:48:07,074 INFO L207 PostProcessor]: Analyzing one entry point: main [2021-11-19 15:48:07,182 INFO L208 MainTranslator]: Completed translation [2021-11-19 15:48:07,183 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 03:48:07 WrapperNode [2021-11-19 15:48:07,183 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-19 15:48:07,184 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-19 15:48:07,184 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-19 15:48:07,185 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-19 15:48:07,193 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 03:48:07" (1/1) ... [2021-11-19 15:48:07,335 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 03:48:07" (1/1) ... [2021-11-19 15:48:07,885 INFO L137 Inliner]: procedures = 70, calls = 81, calls flagged for inlining = 47, calls inlined = 47, statements flattened = 13260 [2021-11-19 15:48:07,886 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-19 15:48:07,899 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-19 15:48:07,899 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-19 15:48:07,900 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-19 15:48:07,933 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 03:48:07" (1/1) ... [2021-11-19 15:48:07,934 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 03:48:07" (1/1) ... [2021-11-19 15:48:08,009 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 03:48:07" (1/1) ... [2021-11-19 15:48:08,009 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 03:48:07" (1/1) ... [2021-11-19 15:48:08,358 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 03:48:07" (1/1) ... [2021-11-19 15:48:08,479 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 03:48:07" (1/1) ... [2021-11-19 15:48:08,609 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 03:48:07" (1/1) ... [2021-11-19 15:48:08,770 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-19 15:48:08,772 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-19 15:48:08,772 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-19 15:48:08,773 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-19 15:48:08,774 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 03:48:07" (1/1) ... [2021-11-19 15:48:08,799 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-19 15:48:08,815 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57beaffc-a6fc-4002-af26-360773f10f56/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 15:48:08,857 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57beaffc-a6fc-4002-af26-360773f10f56/bin/utaipan-UbGMyvGFUs/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-19 15:48:08,924 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57beaffc-a6fc-4002-af26-360773f10f56/bin/utaipan-UbGMyvGFUs/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-19 15:48:09,007 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-19 15:48:09,007 INFO L130 BoogieDeclarations]: Found specification of procedure activate_threads [2021-11-19 15:48:09,008 INFO L138 BoogieDeclarations]: Found implementation of procedure activate_threads [2021-11-19 15:48:09,008 INFO L130 BoogieDeclarations]: Found specification of procedure immediate_notify [2021-11-19 15:48:09,008 INFO L138 BoogieDeclarations]: Found implementation of procedure immediate_notify [2021-11-19 15:48:09,008 INFO L130 BoogieDeclarations]: Found specification of procedure update_channels [2021-11-19 15:48:09,008 INFO L138 BoogieDeclarations]: Found implementation of procedure update_channels [2021-11-19 15:48:09,008 INFO L130 BoogieDeclarations]: Found specification of procedure error [2021-11-19 15:48:09,008 INFO L138 BoogieDeclarations]: Found implementation of procedure error [2021-11-19 15:48:09,009 INFO L130 BoogieDeclarations]: Found specification of procedure fire_delta_events [2021-11-19 15:48:09,009 INFO L138 BoogieDeclarations]: Found implementation of procedure fire_delta_events [2021-11-19 15:48:09,009 INFO L130 BoogieDeclarations]: Found specification of procedure exists_runnable_thread [2021-11-19 15:48:09,009 INFO L138 BoogieDeclarations]: Found implementation of procedure exists_runnable_thread [2021-11-19 15:48:09,009 INFO L130 BoogieDeclarations]: Found specification of procedure reset_delta_events [2021-11-19 15:48:09,009 INFO L138 BoogieDeclarations]: Found implementation of procedure reset_delta_events [2021-11-19 15:48:09,009 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-19 15:48:09,009 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-19 15:48:09,010 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-19 15:48:09,298 INFO L236 CfgBuilder]: Building ICFG [2021-11-19 15:48:09,301 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-19 15:48:18,567 INFO L277 CfgBuilder]: Performing block encoding [2021-11-19 15:48:21,797 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-19 15:48:21,797 INFO L301 CfgBuilder]: Removed 17 assume(true) statements. [2021-11-19 15:48:21,804 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 03:48:21 BoogieIcfgContainer [2021-11-19 15:48:21,804 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-19 15:48:21,806 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-19 15:48:21,807 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-19 15:48:21,813 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-19 15:48:21,814 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 19.11 03:48:01" (1/3) ... [2021-11-19 15:48:21,815 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@257ab39f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 03:48:21, skipping insertion in model container [2021-11-19 15:48:21,816 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 03:48:07" (2/3) ... [2021-11-19 15:48:21,816 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@257ab39f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 03:48:21, skipping insertion in model container [2021-11-19 15:48:21,816 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 03:48:21" (3/3) ... [2021-11-19 15:48:21,819 INFO L111 eAbstractionObserver]: Analyzing ICFG Problem05_label43+token_ring.15.cil.c [2021-11-19 15:48:21,828 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-19 15:48:21,828 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 2 error locations. [2021-11-19 15:48:21,910 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-19 15:48:21,918 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 15:48:21,919 INFO L340 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-11-19 15:48:22,000 INFO L276 IsEmpty]: Start isEmpty. Operand has 1848 states, 1809 states have (on average 1.9541182974018796) internal successors, (3535), 1814 states have internal predecessors, (3535), 29 states have call successors, (29), 7 states have call predecessors, (29), 7 states have return successors, (29), 28 states have call predecessors, (29), 29 states have call successors, (29) [2021-11-19 15:48:22,015 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2021-11-19 15:48:22,015 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 15:48:22,016 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 15:48:22,017 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 15:48:22,029 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 15:48:22,029 INFO L85 PathProgramCache]: Analyzing trace with hash -26028369, now seen corresponding path program 1 times [2021-11-19 15:48:22,046 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 15:48:22,047 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [689341403] [2021-11-19 15:48:22,047 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 15:48:22,048 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 15:48:22,273 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 15:48:22,603 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 15:48:22,619 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 15:48:22,620 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [689341403] [2021-11-19 15:48:22,621 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [689341403] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-19 15:48:22,621 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-19 15:48:22,622 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-19 15:48:22,624 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [20333989] [2021-11-19 15:48:22,625 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-19 15:48:22,631 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-19 15:48:22,631 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 15:48:22,666 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-19 15:48:22,667 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-19 15:48:22,677 INFO L87 Difference]: Start difference. First operand has 1848 states, 1809 states have (on average 1.9541182974018796) internal successors, (3535), 1814 states have internal predecessors, (3535), 29 states have call successors, (29), 7 states have call predecessors, (29), 7 states have return successors, (29), 28 states have call predecessors, (29), 29 states have call successors, (29) Second operand has 4 states, 4 states have (on average 15.0) internal successors, (60), 4 states have internal predecessors, (60), 2 states have call successors, (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 15:48:24,275 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 15:48:24,276 INFO L93 Difference]: Finished difference Result 3877 states and 7503 transitions. [2021-11-19 15:48:24,277 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-19 15:48:24,279 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 15.0) internal successors, (60), 4 states have internal predecessors, (60), 2 states have call successors, (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 71 [2021-11-19 15:48:24,279 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 15:48:24,322 INFO L225 Difference]: With dead ends: 3877 [2021-11-19 15:48:24,323 INFO L226 Difference]: Without dead ends: 2028 [2021-11-19 15:48:24,337 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 15:48:24,344 INFO L933 BasicCegarLoop]: 3549 mSDtfsCounter, 3820 mSDsluCounter, 3759 mSDsCounter, 0 mSdLazyCounter, 744 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3820 SdHoareTripleChecker+Valid, 6994 SdHoareTripleChecker+Invalid, 758 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 744 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.3s IncrementalHoareTripleChecker+Time [2021-11-19 15:48:24,346 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3820 Valid, 6994 Invalid, 758 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [14 Valid, 744 Invalid, 0 Unknown, 0 Unchecked, 1.3s Time] [2021-11-19 15:48:24,372 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2028 states. [2021-11-19 15:48:24,515 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2028 to 2027. [2021-11-19 15:48:24,523 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2027 states, 1961 states have (on average 1.9163691993880674) internal successors, (3758), 1965 states have internal predecessors, (3758), 52 states have call successors, (52), 13 states have call predecessors, (52), 12 states have return successors, (50), 49 states have call predecessors, (50), 50 states have call successors, (50) [2021-11-19 15:48:24,543 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2027 states to 2027 states and 3860 transitions. [2021-11-19 15:48:24,545 INFO L78 Accepts]: Start accepts. Automaton has 2027 states and 3860 transitions. Word has length 71 [2021-11-19 15:48:24,545 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 15:48:24,546 INFO L470 AbstractCegarLoop]: Abstraction has 2027 states and 3860 transitions. [2021-11-19 15:48:24,546 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 15.0) internal successors, (60), 4 states have internal predecessors, (60), 2 states have call successors, (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 15:48:24,546 INFO L276 IsEmpty]: Start isEmpty. Operand 2027 states and 3860 transitions. [2021-11-19 15:48:24,558 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 145 [2021-11-19 15:48:24,558 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 15:48:24,559 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 15:48:24,559 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-19 15:48:24,560 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 15:48:24,561 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 15:48:24,561 INFO L85 PathProgramCache]: Analyzing trace with hash 183933015, now seen corresponding path program 1 times [2021-11-19 15:48:24,561 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 15:48:24,562 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1637859020] [2021-11-19 15:48:24,562 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 15:48:24,562 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 15:48:24,612 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 15:48:24,797 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-19 15:48:24,798 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 15:48:24,798 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1637859020] [2021-11-19 15:48:24,799 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1637859020] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 15:48:24,799 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1701106728] [2021-11-19 15:48:24,799 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 15:48:24,800 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 15:48:24,800 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57beaffc-a6fc-4002-af26-360773f10f56/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 15:48:24,802 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57beaffc-a6fc-4002-af26-360773f10f56/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 15:48:24,823 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57beaffc-a6fc-4002-af26-360773f10f56/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-19 15:48:25,112 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 15:48:25,120 INFO L263 TraceCheckSpWp]: Trace formula consists of 1123 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-19 15:48:25,136 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 15:48:25,512 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 29 proven. 0 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-19 15:48:25,513 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 15:48:25,832 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 38 trivial. 0 not checked. [2021-11-19 15:48:25,832 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1701106728] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-19 15:48:25,832 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-19 15:48:25,833 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5, 4] total 7 [2021-11-19 15:48:25,834 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [750113315] [2021-11-19 15:48:25,834 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-19 15:48:25,835 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-19 15:48:25,836 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 15:48:25,836 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-19 15:48:25,837 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-19 15:48:25,837 INFO L87 Difference]: Start difference. First operand 2027 states and 3860 transitions. Second operand has 3 states, 3 states have (on average 35.666666666666664) internal successors, (107), 2 states have internal predecessors, (107), 2 states have call successors, (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 15:48:26,486 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 15:48:26,487 INFO L93 Difference]: Finished difference Result 2782 states and 5049 transitions. [2021-11-19 15:48:26,487 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-19 15:48:26,488 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 35.666666666666664) internal successors, (107), 2 states have internal predecessors, (107), 2 states have call successors, (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 144 [2021-11-19 15:48:26,488 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 15:48:26,510 INFO L225 Difference]: With dead ends: 2782 [2021-11-19 15:48:26,511 INFO L226 Difference]: Without dead ends: 2401 [2021-11-19 15:48:26,514 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 291 GetRequests, 285 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 15:48:26,516 INFO L933 BasicCegarLoop]: 3376 mSDtfsCounter, 3533 mSDsluCounter, 294 mSDsCounter, 0 mSdLazyCounter, 322 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3533 SdHoareTripleChecker+Valid, 3624 SdHoareTripleChecker+Invalid, 324 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 322 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-19 15:48:26,516 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3533 Valid, 3624 Invalid, 324 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 322 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-19 15:48:26,521 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2401 states. [2021-11-19 15:48:26,612 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2401 to 2395. [2021-11-19 15:48:26,620 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2395 states, 2273 states have (on average 1.86229652441707) internal successors, (4233), 2278 states have internal predecessors, (4233), 96 states have call successors, (96), 25 states have call predecessors, (96), 24 states have return successors, (94), 92 states have call predecessors, (94), 94 states have call successors, (94) [2021-11-19 15:48:26,640 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2395 states to 2395 states and 4423 transitions. [2021-11-19 15:48:26,641 INFO L78 Accepts]: Start accepts. Automaton has 2395 states and 4423 transitions. Word has length 144 [2021-11-19 15:48:26,642 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 15:48:26,642 INFO L470 AbstractCegarLoop]: Abstraction has 2395 states and 4423 transitions. [2021-11-19 15:48:26,642 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 35.666666666666664) internal successors, (107), 2 states have internal predecessors, (107), 2 states have call successors, (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 15:48:26,643 INFO L276 IsEmpty]: Start isEmpty. Operand 2395 states and 4423 transitions. [2021-11-19 15:48:26,648 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 145 [2021-11-19 15:48:26,649 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 15:48:26,649 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 15:48:26,688 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57beaffc-a6fc-4002-af26-360773f10f56/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-19 15:48:26,871 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57beaffc-a6fc-4002-af26-360773f10f56/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 15:48:26,872 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 15:48:26,872 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 15:48:26,873 INFO L85 PathProgramCache]: Analyzing trace with hash -802749291, now seen corresponding path program 1 times [2021-11-19 15:48:26,873 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 15:48:26,873 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [645305786] [2021-11-19 15:48:26,873 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 15:48:26,874 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 15:48:26,904 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 15:48:27,041 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-19 15:48:27,041 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 15:48:27,042 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [645305786] [2021-11-19 15:48:27,046 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [645305786] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 15:48:27,046 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2132293765] [2021-11-19 15:48:27,046 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 15:48:27,047 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 15:48:27,047 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57beaffc-a6fc-4002-af26-360773f10f56/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 15:48:27,051 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57beaffc-a6fc-4002-af26-360773f10f56/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 15:48:27,067 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57beaffc-a6fc-4002-af26-360773f10f56/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-19 15:48:27,337 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 15:48:27,343 INFO L263 TraceCheckSpWp]: Trace formula consists of 1117 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-19 15:48:27,350 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 15:48:27,675 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 35 proven. 0 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-11-19 15:48:27,675 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 15:48:28,008 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 44 trivial. 0 not checked. [2021-11-19 15:48:28,009 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2132293765] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-19 15:48:28,009 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-19 15:48:28,009 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5, 4] total 7 [2021-11-19 15:48:28,009 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [769968728] [2021-11-19 15:48:28,010 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-19 15:48:28,010 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-19 15:48:28,011 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 15:48:28,011 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-19 15:48:28,011 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-19 15:48:28,012 INFO L87 Difference]: Start difference. First operand 2395 states and 4423 transitions. Second operand has 3 states, 3 states have (on average 37.666666666666664) internal successors, (113), 2 states have internal predecessors, (113), 2 states have call successors, (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 15:48:28,617 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 15:48:28,617 INFO L93 Difference]: Finished difference Result 3880 states and 6758 transitions. [2021-11-19 15:48:28,618 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-19 15:48:28,618 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 37.666666666666664) internal successors, (113), 2 states have internal predecessors, (113), 2 states have call successors, (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 144 [2021-11-19 15:48:28,619 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 15:48:28,648 INFO L225 Difference]: With dead ends: 3880 [2021-11-19 15:48:28,649 INFO L226 Difference]: Without dead ends: 3131 [2021-11-19 15:48:28,656 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 291 GetRequests, 285 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 15:48:28,660 INFO L933 BasicCegarLoop]: 3334 mSDtfsCounter, 3527 mSDsluCounter, 294 mSDsCounter, 0 mSdLazyCounter, 319 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3527 SdHoareTripleChecker+Valid, 3582 SdHoareTripleChecker+Invalid, 321 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 319 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-19 15:48:28,662 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3527 Valid, 3582 Invalid, 321 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 319 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-19 15:48:28,670 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3131 states. [2021-11-19 15:48:28,951 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3131 to 3123. [2021-11-19 15:48:28,961 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3123 states, 2891 states have (on average 1.7886544448287789) internal successors, (5171), 2898 states have internal predecessors, (5171), 182 states have call successors, (182), 49 states have call predecessors, (182), 48 states have return successors, (180), 176 states have call predecessors, (180), 180 states have call successors, (180) [2021-11-19 15:48:28,985 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3123 states to 3123 states and 5533 transitions. [2021-11-19 15:48:28,986 INFO L78 Accepts]: Start accepts. Automaton has 3123 states and 5533 transitions. Word has length 144 [2021-11-19 15:48:28,986 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 15:48:28,987 INFO L470 AbstractCegarLoop]: Abstraction has 3123 states and 5533 transitions. [2021-11-19 15:48:28,987 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 37.666666666666664) internal successors, (113), 2 states have internal predecessors, (113), 2 states have call successors, (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 15:48:28,987 INFO L276 IsEmpty]: Start isEmpty. Operand 3123 states and 5533 transitions. [2021-11-19 15:48:28,994 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 145 [2021-11-19 15:48:28,994 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 15:48:28,994 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 15:48:29,036 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57beaffc-a6fc-4002-af26-360773f10f56/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-19 15:48:29,211 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57beaffc-a6fc-4002-af26-360773f10f56/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 15:48:29,211 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 15:48:29,211 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 15:48:29,212 INFO L85 PathProgramCache]: Analyzing trace with hash -1405814957, now seen corresponding path program 1 times [2021-11-19 15:48:29,212 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 15:48:29,212 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1279214957] [2021-11-19 15:48:29,213 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 15:48:29,213 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 15:48:29,237 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 15:48:29,335 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-19 15:48:29,336 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 15:48:29,336 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1279214957] [2021-11-19 15:48:29,336 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1279214957] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 15:48:29,340 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1778049699] [2021-11-19 15:48:29,341 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 15:48:29,341 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 15:48:29,342 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57beaffc-a6fc-4002-af26-360773f10f56/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 15:48:29,347 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57beaffc-a6fc-4002-af26-360773f10f56/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 15:48:29,369 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57beaffc-a6fc-4002-af26-360773f10f56/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-19 15:48:29,617 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 15:48:29,623 INFO L263 TraceCheckSpWp]: Trace formula consists of 1111 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-19 15:48:29,629 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 15:48:29,870 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2021-11-19 15:48:29,870 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 15:48:30,143 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 0 proven. 33 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-19 15:48:30,143 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1778049699] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-19 15:48:30,144 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-19 15:48:30,144 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5, 4] total 7 [2021-11-19 15:48:30,144 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [422637628] [2021-11-19 15:48:30,145 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-19 15:48:30,145 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-19 15:48:30,146 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 15:48:30,146 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-19 15:48:30,147 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-19 15:48:30,152 INFO L87 Difference]: Start difference. First operand 3123 states and 5533 transitions. Second operand has 3 states, 3 states have (on average 29.666666666666668) internal successors, (89), 2 states have internal predecessors, (89), 2 states have call successors, (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 15:48:30,772 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 15:48:30,773 INFO L93 Difference]: Finished difference Result 6052 states and 10126 transitions. [2021-11-19 15:48:30,773 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-19 15:48:30,774 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 29.666666666666668) internal successors, (89), 2 states have internal predecessors, (89), 2 states have call successors, (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 144 [2021-11-19 15:48:30,774 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 15:48:30,808 INFO L225 Difference]: With dead ends: 6052 [2021-11-19 15:48:30,809 INFO L226 Difference]: Without dead ends: 4575 [2021-11-19 15:48:30,818 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 291 GetRequests, 285 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 15:48:30,826 INFO L933 BasicCegarLoop]: 3374 mSDtfsCounter, 3551 mSDsluCounter, 294 mSDsCounter, 0 mSdLazyCounter, 322 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3551 SdHoareTripleChecker+Valid, 3622 SdHoareTripleChecker+Invalid, 324 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 322 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-19 15:48:30,829 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3551 Valid, 3622 Invalid, 324 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 322 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-19 15:48:30,838 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4575 states. [2021-11-19 15:48:31,027 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4575 to 4563. [2021-11-19 15:48:31,039 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4563 states, 4115 states have (on average 1.7066828675577157) internal successors, (7023), 4126 states have internal predecessors, (7023), 350 states have call successors, (350), 97 states have call predecessors, (350), 96 states have return successors, (348), 340 states have call predecessors, (348), 348 states have call successors, (348) [2021-11-19 15:48:31,075 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4563 states to 4563 states and 7721 transitions. [2021-11-19 15:48:31,076 INFO L78 Accepts]: Start accepts. Automaton has 4563 states and 7721 transitions. Word has length 144 [2021-11-19 15:48:31,077 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 15:48:31,077 INFO L470 AbstractCegarLoop]: Abstraction has 4563 states and 7721 transitions. [2021-11-19 15:48:31,077 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 29.666666666666668) internal successors, (89), 2 states have internal predecessors, (89), 2 states have call successors, (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 15:48:31,077 INFO L276 IsEmpty]: Start isEmpty. Operand 4563 states and 7721 transitions. [2021-11-19 15:48:31,093 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 145 [2021-11-19 15:48:31,094 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 15:48:31,094 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 15:48:31,132 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57beaffc-a6fc-4002-af26-360773f10f56/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-19 15:48:31,307 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57beaffc-a6fc-4002-af26-360773f10f56/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 15:48:31,307 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 15:48:31,307 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 15:48:31,308 INFO L85 PathProgramCache]: Analyzing trace with hash 904269841, now seen corresponding path program 1 times [2021-11-19 15:48:31,308 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 15:48:31,308 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [941613899] [2021-11-19 15:48:31,308 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 15:48:31,308 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 15:48:31,330 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 15:48:31,393 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-19 15:48:31,393 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 15:48:31,393 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [941613899] [2021-11-19 15:48:31,393 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [941613899] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 15:48:31,394 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [615357056] [2021-11-19 15:48:31,394 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 15:48:31,394 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 15:48:31,394 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57beaffc-a6fc-4002-af26-360773f10f56/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 15:48:31,395 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57beaffc-a6fc-4002-af26-360773f10f56/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 15:48:31,411 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57beaffc-a6fc-4002-af26-360773f10f56/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-19 15:48:31,635 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 15:48:31,641 INFO L263 TraceCheckSpWp]: Trace formula consists of 1105 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-19 15:48:31,645 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 15:48:31,890 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 17 proven. 0 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-11-19 15:48:31,891 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 15:48:32,154 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-11-19 15:48:32,155 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [615357056] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-19 15:48:32,155 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-19 15:48:32,155 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5, 4] total 7 [2021-11-19 15:48:32,155 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1268561885] [2021-11-19 15:48:32,156 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-19 15:48:32,157 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-19 15:48:32,157 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 15:48:32,157 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-19 15:48:32,158 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-19 15:48:32,158 INFO L87 Difference]: Start difference. First operand 4563 states and 7721 transitions. Second operand has 3 states, 3 states have (on average 31.666666666666668) internal successors, (95), 2 states have internal predecessors, (95), 2 states have call successors, (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 15:48:32,967 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 15:48:32,967 INFO L93 Difference]: Finished difference Result 10348 states and 16762 transitions. [2021-11-19 15:48:32,968 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-19 15:48:32,969 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 31.666666666666668) internal successors, (95), 2 states have internal predecessors, (95), 2 states have call successors, (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 144 [2021-11-19 15:48:32,971 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 15:48:33,034 INFO L225 Difference]: With dead ends: 10348 [2021-11-19 15:48:33,036 INFO L226 Difference]: Without dead ends: 7431 [2021-11-19 15:48:33,050 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 291 GetRequests, 285 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 15:48:33,053 INFO L933 BasicCegarLoop]: 3334 mSDtfsCounter, 3545 mSDsluCounter, 294 mSDsCounter, 0 mSdLazyCounter, 319 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3545 SdHoareTripleChecker+Valid, 3582 SdHoareTripleChecker+Invalid, 321 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 319 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-19 15:48:33,054 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3545 Valid, 3582 Invalid, 321 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 319 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-19 15:48:33,066 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7431 states. [2021-11-19 15:48:33,342 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7431 to 7411. [2021-11-19 15:48:33,376 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 7411 states, 6539 states have (on average 1.6331243309374521) internal successors, (10679), 6558 states have internal predecessors, (10679), 678 states have call successors, (678), 193 states have call predecessors, (678), 192 states have return successors, (676), 660 states have call predecessors, (676), 676 states have call successors, (676) [2021-11-19 15:48:33,415 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7411 states to 7411 states and 12033 transitions. [2021-11-19 15:48:33,416 INFO L78 Accepts]: Start accepts. Automaton has 7411 states and 12033 transitions. Word has length 144 [2021-11-19 15:48:33,417 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 15:48:33,417 INFO L470 AbstractCegarLoop]: Abstraction has 7411 states and 12033 transitions. [2021-11-19 15:48:33,418 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 31.666666666666668) internal successors, (95), 2 states have internal predecessors, (95), 2 states have call successors, (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 15:48:33,418 INFO L276 IsEmpty]: Start isEmpty. Operand 7411 states and 12033 transitions. [2021-11-19 15:48:33,434 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 145 [2021-11-19 15:48:33,434 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 15:48:33,435 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 15:48:33,478 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57beaffc-a6fc-4002-af26-360773f10f56/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-19 15:48:33,663 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57beaffc-a6fc-4002-af26-360773f10f56/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 15:48:33,663 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 15:48:33,663 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 15:48:33,663 INFO L85 PathProgramCache]: Analyzing trace with hash -1114632369, now seen corresponding path program 1 times [2021-11-19 15:48:33,663 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 15:48:33,664 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [33671414] [2021-11-19 15:48:33,664 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 15:48:33,664 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 15:48:33,686 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 15:48:33,765 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-19 15:48:33,765 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 15:48:33,765 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [33671414] [2021-11-19 15:48:33,766 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [33671414] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 15:48:33,766 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1431491659] [2021-11-19 15:48:33,766 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 15:48:33,766 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 15:48:33,766 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57beaffc-a6fc-4002-af26-360773f10f56/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 15:48:33,767 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57beaffc-a6fc-4002-af26-360773f10f56/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 15:48:33,774 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57beaffc-a6fc-4002-af26-360773f10f56/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-19 15:48:34,018 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 15:48:34,024 INFO L263 TraceCheckSpWp]: Trace formula consists of 1099 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-19 15:48:34,028 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 15:48:34,319 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-11-19 15:48:34,320 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 15:48:34,671 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2021-11-19 15:48:34,671 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1431491659] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-19 15:48:34,672 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-19 15:48:34,672 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5, 4] total 7 [2021-11-19 15:48:34,672 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1308090505] [2021-11-19 15:48:34,672 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-19 15:48:34,673 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-19 15:48:34,673 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 15:48:34,674 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-19 15:48:34,674 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-19 15:48:34,674 INFO L87 Difference]: Start difference. First operand 7411 states and 12033 transitions. Second operand has 3 states, 3 states have (on average 28.666666666666668) internal successors, (86), 2 states have internal predecessors, (86), 2 states have call successors, (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 15:48:35,682 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 15:48:35,683 INFO L93 Difference]: Finished difference Result 18844 states and 29834 transitions. [2021-11-19 15:48:35,683 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-19 15:48:35,684 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 28.666666666666668) internal successors, (86), 2 states have internal predecessors, (86), 2 states have call successors, (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 144 [2021-11-19 15:48:35,684 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 15:48:35,778 INFO L225 Difference]: With dead ends: 18844 [2021-11-19 15:48:35,779 INFO L226 Difference]: Without dead ends: 13079 [2021-11-19 15:48:35,810 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 291 GetRequests, 285 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 15:48:35,812 INFO L933 BasicCegarLoop]: 3334 mSDtfsCounter, 3554 mSDsluCounter, 294 mSDsCounter, 0 mSdLazyCounter, 319 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3554 SdHoareTripleChecker+Valid, 3582 SdHoareTripleChecker+Invalid, 321 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 319 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-19 15:48:35,812 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3554 Valid, 3582 Invalid, 321 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 319 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-19 15:48:35,836 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13079 states. [2021-11-19 15:48:36,356 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13079 to 13043. [2021-11-19 15:48:36,383 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13043 states, 11339 states have (on average 1.578181497486551) internal successors, (17895), 11374 states have internal predecessors, (17895), 1318 states have call successors, (1318), 385 states have call predecessors, (1318), 384 states have return successors, (1316), 1284 states have call predecessors, (1316), 1316 states have call successors, (1316) [2021-11-19 15:48:36,452 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13043 states to 13043 states and 20529 transitions. [2021-11-19 15:48:36,454 INFO L78 Accepts]: Start accepts. Automaton has 13043 states and 20529 transitions. Word has length 144 [2021-11-19 15:48:36,455 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 15:48:36,455 INFO L470 AbstractCegarLoop]: Abstraction has 13043 states and 20529 transitions. [2021-11-19 15:48:36,456 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 28.666666666666668) internal successors, (86), 2 states have internal predecessors, (86), 2 states have call successors, (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 15:48:36,456 INFO L276 IsEmpty]: Start isEmpty. Operand 13043 states and 20529 transitions. [2021-11-19 15:48:36,490 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 145 [2021-11-19 15:48:36,491 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 15:48:36,491 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 15:48:36,539 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57beaffc-a6fc-4002-af26-360773f10f56/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-19 15:48:36,711 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57beaffc-a6fc-4002-af26-360773f10f56/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2021-11-19 15:48:36,711 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 15:48:36,712 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 15:48:36,712 INFO L85 PathProgramCache]: Analyzing trace with hash 360601041, now seen corresponding path program 1 times [2021-11-19 15:48:36,712 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 15:48:36,712 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [6714488] [2021-11-19 15:48:36,712 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 15:48:36,712 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 15:48:36,754 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 15:48:36,814 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-19 15:48:36,814 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 15:48:36,815 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [6714488] [2021-11-19 15:48:36,815 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [6714488] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 15:48:36,815 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [3775382] [2021-11-19 15:48:36,815 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 15:48:36,815 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 15:48:36,816 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57beaffc-a6fc-4002-af26-360773f10f56/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 15:48:36,816 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57beaffc-a6fc-4002-af26-360773f10f56/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 15:48:36,827 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57beaffc-a6fc-4002-af26-360773f10f56/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-19 15:48:37,065 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 15:48:37,071 INFO L263 TraceCheckSpWp]: Trace formula consists of 1093 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-19 15:48:37,075 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 15:48:37,346 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 38 proven. 0 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-19 15:48:37,346 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 15:48:37,611 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 47 trivial. 0 not checked. [2021-11-19 15:48:37,611 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [3775382] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-19 15:48:37,612 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-19 15:48:37,612 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5, 4] total 7 [2021-11-19 15:48:37,612 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1237012021] [2021-11-19 15:48:37,612 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-19 15:48:37,613 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-19 15:48:37,613 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 15:48:37,614 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-19 15:48:37,614 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-19 15:48:37,614 INFO L87 Difference]: Start difference. First operand 13043 states and 20529 transitions. Second operand has 3 states, 3 states have (on average 38.666666666666664) internal successors, (116), 2 states have internal predecessors, (116), 2 states have call successors, (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 15:48:39,048 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 15:48:39,049 INFO L93 Difference]: Finished difference Result 35644 states and 55578 transitions. [2021-11-19 15:48:39,050 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-19 15:48:39,050 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 38.666666666666664) internal successors, (116), 2 states have internal predecessors, (116), 2 states have call successors, (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 144 [2021-11-19 15:48:39,051 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 15:48:39,194 INFO L225 Difference]: With dead ends: 35644 [2021-11-19 15:48:39,194 INFO L226 Difference]: Without dead ends: 24247 [2021-11-19 15:48:39,259 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 291 GetRequests, 285 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 15:48:39,260 INFO L933 BasicCegarLoop]: 3334 mSDtfsCounter, 3524 mSDsluCounter, 294 mSDsCounter, 0 mSdLazyCounter, 319 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3524 SdHoareTripleChecker+Valid, 3582 SdHoareTripleChecker+Invalid, 321 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 319 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-19 15:48:39,261 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3524 Valid, 3582 Invalid, 321 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 319 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-19 15:48:39,302 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24247 states. [2021-11-19 15:48:40,514 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24247 to 24179. [2021-11-19 15:48:40,550 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24179 states, 20843 states have (on average 1.5417646212157559) internal successors, (32135), 20910 states have internal predecessors, (32135), 2566 states have call successors, (2566), 769 states have call predecessors, (2566), 768 states have return successors, (2564), 2500 states have call predecessors, (2564), 2564 states have call successors, (2564) [2021-11-19 15:48:40,674 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24179 states to 24179 states and 37265 transitions. [2021-11-19 15:48:40,677 INFO L78 Accepts]: Start accepts. Automaton has 24179 states and 37265 transitions. Word has length 144 [2021-11-19 15:48:40,677 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 15:48:40,677 INFO L470 AbstractCegarLoop]: Abstraction has 24179 states and 37265 transitions. [2021-11-19 15:48:40,678 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 38.666666666666664) internal successors, (116), 2 states have internal predecessors, (116), 2 states have call successors, (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 15:48:40,678 INFO L276 IsEmpty]: Start isEmpty. Operand 24179 states and 37265 transitions. [2021-11-19 15:48:40,743 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 145 [2021-11-19 15:48:40,743 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 15:48:40,744 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 15:48:40,785 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57beaffc-a6fc-4002-af26-360773f10f56/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-19 15:48:40,967 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57beaffc-a6fc-4002-af26-360773f10f56/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 15:48:40,967 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 15:48:40,967 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 15:48:40,968 INFO L85 PathProgramCache]: Analyzing trace with hash -375551021, now seen corresponding path program 1 times [2021-11-19 15:48:40,968 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 15:48:40,968 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [643104799] [2021-11-19 15:48:40,968 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 15:48:40,968 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 15:48:41,010 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 15:48:41,101 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-19 15:48:41,102 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 15:48:41,102 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [643104799] [2021-11-19 15:48:41,102 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [643104799] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 15:48:41,102 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [477052021] [2021-11-19 15:48:41,102 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 15:48:41,103 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 15:48:41,103 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57beaffc-a6fc-4002-af26-360773f10f56/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 15:48:41,104 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57beaffc-a6fc-4002-af26-360773f10f56/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 15:48:41,123 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57beaffc-a6fc-4002-af26-360773f10f56/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-19 15:48:41,352 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 15:48:41,357 INFO L263 TraceCheckSpWp]: Trace formula consists of 1087 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-19 15:48:41,361 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 15:48:41,720 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 23 proven. 0 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2021-11-19 15:48:41,720 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 15:48:42,086 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-19 15:48:42,087 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [477052021] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-19 15:48:42,087 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-19 15:48:42,088 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5, 4] total 7 [2021-11-19 15:48:42,088 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1460455076] [2021-11-19 15:48:42,088 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-19 15:48:42,089 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-19 15:48:42,089 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 15:48:42,089 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-19 15:48:42,090 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-19 15:48:42,090 INFO L87 Difference]: Start difference. First operand 24179 states and 37265 transitions. Second operand has 3 states, 3 states have (on average 33.666666666666664) internal successors, (101), 2 states have internal predecessors, (101), 2 states have call successors, (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 15:48:44,197 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 15:48:44,197 INFO L93 Difference]: Finished difference Result 68860 states and 106266 transitions. [2021-11-19 15:48:44,198 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-19 15:48:44,198 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 33.666666666666664) internal successors, (101), 2 states have internal predecessors, (101), 2 states have call successors, (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 144 [2021-11-19 15:48:44,199 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 15:48:44,425 INFO L225 Difference]: With dead ends: 68860 [2021-11-19 15:48:44,425 INFO L226 Difference]: Without dead ends: 46327 [2021-11-19 15:48:44,504 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 291 GetRequests, 285 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 15:48:44,505 INFO L933 BasicCegarLoop]: 3334 mSDtfsCounter, 3539 mSDsluCounter, 294 mSDsCounter, 0 mSdLazyCounter, 319 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3539 SdHoareTripleChecker+Valid, 3582 SdHoareTripleChecker+Invalid, 321 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 319 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-19 15:48:44,505 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3539 Valid, 3582 Invalid, 321 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 319 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-19 15:48:44,556 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46327 states. [2021-11-19 15:48:46,293 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46327 to 46195. [2021-11-19 15:48:46,371 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46195 states, 39659 states have (on average 1.5187221059532514) internal successors, (60231), 39790 states have internal predecessors, (60231), 4998 states have call successors, (4998), 1537 states have call predecessors, (4998), 1536 states have return successors, (4996), 4868 states have call predecessors, (4996), 4996 states have call successors, (4996) [2021-11-19 15:48:46,817 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46195 states to 46195 states and 70225 transitions. [2021-11-19 15:48:46,823 INFO L78 Accepts]: Start accepts. Automaton has 46195 states and 70225 transitions. Word has length 144 [2021-11-19 15:48:46,824 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 15:48:46,824 INFO L470 AbstractCegarLoop]: Abstraction has 46195 states and 70225 transitions. [2021-11-19 15:48:46,825 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 33.666666666666664) internal successors, (101), 2 states have internal predecessors, (101), 2 states have call successors, (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 15:48:46,839 INFO L276 IsEmpty]: Start isEmpty. Operand 46195 states and 70225 transitions. [2021-11-19 15:48:46,958 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 145 [2021-11-19 15:48:46,958 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 15:48:46,958 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, 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 15:48:46,998 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57beaffc-a6fc-4002-af26-360773f10f56/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2021-11-19 15:48:47,175 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57beaffc-a6fc-4002-af26-360773f10f56/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 15:48:47,175 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 15:48:47,176 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 15:48:47,176 INFO L85 PathProgramCache]: Analyzing trace with hash -74493551, now seen corresponding path program 1 times [2021-11-19 15:48:47,176 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 15:48:47,176 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1257530775] [2021-11-19 15:48:47,176 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 15:48:47,176 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 15:48:47,228 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 15:48:47,346 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 46 trivial. 0 not checked. [2021-11-19 15:48:47,346 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 15:48:47,347 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1257530775] [2021-11-19 15:48:47,347 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1257530775] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-19 15:48:47,347 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-19 15:48:47,347 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-19 15:48:47,350 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [866786079] [2021-11-19 15:48:47,350 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-19 15:48:47,351 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-19 15:48:47,351 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 15:48:47,351 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-19 15:48:47,351 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-19 15:48:47,352 INFO L87 Difference]: Start difference. First operand 46195 states and 70225 transitions. Second operand has 6 states, 6 states have (on average 13.833333333333334) internal successors, (83), 6 states have internal predecessors, (83), 4 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2021-11-19 15:48:52,791 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 15:48:52,792 INFO L93 Difference]: Finished difference Result 158075 states and 238040 transitions. [2021-11-19 15:48:52,792 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-19 15:48:52,793 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 13.833333333333334) internal successors, (83), 6 states have internal predecessors, (83), 4 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) Word has length 144 [2021-11-19 15:48:52,793 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 15:48:53,864 INFO L225 Difference]: With dead ends: 158075 [2021-11-19 15:48:53,865 INFO L226 Difference]: Without dead ends: 113527 [2021-11-19 15:48:54,002 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=41, Invalid=69, Unknown=0, NotChecked=0, Total=110 [2021-11-19 15:48:54,005 INFO L933 BasicCegarLoop]: 3345 mSDtfsCounter, 4497 mSDsluCounter, 7143 mSDsCounter, 0 mSdLazyCounter, 956 mSolverCounterSat, 156 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4519 SdHoareTripleChecker+Valid, 9963 SdHoareTripleChecker+Invalid, 1112 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 156 IncrementalHoareTripleChecker+Valid, 956 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2021-11-19 15:48:54,005 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [4519 Valid, 9963 Invalid, 1112 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [156 Valid, 956 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2021-11-19 15:48:54,118 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113527 states. [2021-11-19 15:48:57,860 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113527 to 89203. [2021-11-19 15:48:58,156 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 89203 states, 76395 states have (on average 1.5038549643301262) internal successors, (114887), 76654 states have internal predecessors, (114887), 9734 states have call successors, (9734), 3073 states have call predecessors, (9734), 3072 states have return successors, (9732), 9476 states have call predecessors, (9732), 9732 states have call successors, (9732) [2021-11-19 15:48:58,641 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89203 states to 89203 states and 134353 transitions. [2021-11-19 15:48:58,656 INFO L78 Accepts]: Start accepts. Automaton has 89203 states and 134353 transitions. Word has length 144 [2021-11-19 15:48:58,658 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 15:48:58,658 INFO L470 AbstractCegarLoop]: Abstraction has 89203 states and 134353 transitions. [2021-11-19 15:48:58,659 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 13.833333333333334) internal successors, (83), 6 states have internal predecessors, (83), 4 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2021-11-19 15:48:58,659 INFO L276 IsEmpty]: Start isEmpty. Operand 89203 states and 134353 transitions. [2021-11-19 15:48:58,788 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 168 [2021-11-19 15:48:58,788 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 15:48:58,788 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 15:48:58,788 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-11-19 15:48:58,789 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 15:48:58,789 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 15:48:58,789 INFO L85 PathProgramCache]: Analyzing trace with hash 831757559, now seen corresponding path program 1 times [2021-11-19 15:48:58,790 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 15:48:58,790 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [295703102] [2021-11-19 15:48:58,790 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 15:48:58,790 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 15:48:58,833 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 15:48:58,920 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 10 proven. 44 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-11-19 15:48:58,920 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 15:48:58,921 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [295703102] [2021-11-19 15:48:58,921 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [295703102] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 15:48:58,921 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [936561763] [2021-11-19 15:48:58,921 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 15:48:58,921 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 15:48:58,922 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57beaffc-a6fc-4002-af26-360773f10f56/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 15:48:58,923 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57beaffc-a6fc-4002-af26-360773f10f56/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 15:48:58,939 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57beaffc-a6fc-4002-af26-360773f10f56/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-19 15:48:59,160 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 15:48:59,165 INFO L263 TraceCheckSpWp]: Trace formula consists of 1123 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-19 15:48:59,168 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 15:48:59,499 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 29 proven. 0 refuted. 0 times theorem prover too weak. 51 trivial. 0 not checked. [2021-11-19 15:48:59,499 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 15:48:59,819 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 25 proven. 0 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2021-11-19 15:48:59,820 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [936561763] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-19 15:48:59,820 INFO L186 FreeRefinementEngine]: Found 2 perfect and 1 imperfect interpolant sequences. [2021-11-19 15:48:59,820 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [6] total 8 [2021-11-19 15:48:59,820 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [42497231] [2021-11-19 15:48:59,820 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-19 15:48:59,821 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-19 15:48:59,821 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 15:48:59,821 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-19 15:48:59,821 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2021-11-19 15:48:59,822 INFO L87 Difference]: Start difference. First operand 89203 states and 134353 transitions. Second operand has 4 states, 4 states have (on average 30.0) internal successors, (120), 4 states have internal predecessors, (120), 4 states have call successors, (10), 3 states have call predecessors, (10), 2 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-19 15:49:03,751 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 15:49:03,751 INFO L93 Difference]: Finished difference Result 159991 states and 243796 transitions. [2021-11-19 15:49:03,751 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-19 15:49:03,752 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 30.0) internal successors, (120), 4 states have internal predecessors, (120), 4 states have call successors, (10), 3 states have call predecessors, (10), 2 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 167 [2021-11-19 15:49:03,752 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 15:49:04,595 INFO L225 Difference]: With dead ends: 159991 [2021-11-19 15:49:04,595 INFO L226 Difference]: Without dead ends: 115187 [2021-11-19 15:49:04,733 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 340 GetRequests, 334 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 15:49:04,734 INFO L933 BasicCegarLoop]: 3456 mSDtfsCounter, 271 mSDsluCounter, 3589 mSDsCounter, 0 mSdLazyCounter, 566 mSolverCounterSat, 20 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 271 SdHoareTripleChecker+Valid, 6786 SdHoareTripleChecker+Invalid, 586 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 20 IncrementalHoareTripleChecker+Valid, 566 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-19 15:49:04,734 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [271 Valid, 6786 Invalid, 586 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [20 Valid, 566 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-19 15:49:04,859 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 115187 states. [2021-11-19 15:49:09,053 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 115187 to 106227. [2021-11-19 15:49:09,151 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 106227 states, 92907 states have (on average 1.5451903516419645) internal successors, (143559), 93166 states have internal predecessors, (143559), 9990 states have call successors, (9990), 3329 states have call predecessors, (9990), 3328 states have return successors, (9988), 9732 states have call predecessors, (9988), 9988 states have call successors, (9988) [2021-11-19 15:49:09,712 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106227 states to 106227 states and 163537 transitions. [2021-11-19 15:49:09,731 INFO L78 Accepts]: Start accepts. Automaton has 106227 states and 163537 transitions. Word has length 167 [2021-11-19 15:49:09,732 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 15:49:09,732 INFO L470 AbstractCegarLoop]: Abstraction has 106227 states and 163537 transitions. [2021-11-19 15:49:09,732 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 30.0) internal successors, (120), 4 states have internal predecessors, (120), 4 states have call successors, (10), 3 states have call predecessors, (10), 2 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-19 15:49:09,732 INFO L276 IsEmpty]: Start isEmpty. Operand 106227 states and 163537 transitions. [2021-11-19 15:49:10,047 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 221 [2021-11-19 15:49:10,047 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 15:49:10,047 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 15:49:10,094 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57beaffc-a6fc-4002-af26-360773f10f56/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-19 15:49:10,263 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57beaffc-a6fc-4002-af26-360773f10f56/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-11-19 15:49:10,263 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 15:49:10,264 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 15:49:10,264 INFO L85 PathProgramCache]: Analyzing trace with hash -197473318, now seen corresponding path program 1 times [2021-11-19 15:49:10,264 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 15:49:10,264 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [213217757] [2021-11-19 15:49:10,264 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 15:49:10,265 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 15:49:10,313 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 15:49:10,425 INFO L134 CoverageAnalysis]: Checked inductivity of 169 backedges. 10 proven. 87 refuted. 0 times theorem prover too weak. 72 trivial. 0 not checked. [2021-11-19 15:49:10,426 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 15:49:10,426 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [213217757] [2021-11-19 15:49:10,426 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [213217757] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 15:49:10,426 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [311275944] [2021-11-19 15:49:10,427 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 15:49:10,427 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 15:49:10,427 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57beaffc-a6fc-4002-af26-360773f10f56/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 15:49:10,428 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57beaffc-a6fc-4002-af26-360773f10f56/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 15:49:10,763 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57beaffc-a6fc-4002-af26-360773f10f56/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-19 15:49:11,034 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 15:49:11,041 INFO L263 TraceCheckSpWp]: Trace formula consists of 1405 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-19 15:49:11,045 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 15:49:11,603 INFO L134 CoverageAnalysis]: Checked inductivity of 169 backedges. 105 proven. 0 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2021-11-19 15:49:11,603 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 15:49:12,104 INFO L134 CoverageAnalysis]: Checked inductivity of 169 backedges. 12 proven. 0 refuted. 0 times theorem prover too weak. 157 trivial. 0 not checked. [2021-11-19 15:49:12,104 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [311275944] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-19 15:49:12,105 INFO L186 FreeRefinementEngine]: Found 2 perfect and 1 imperfect interpolant sequences. [2021-11-19 15:49:12,105 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2, 3] imperfect sequences [6] total 7 [2021-11-19 15:49:12,106 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2114920348] [2021-11-19 15:49:12,106 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-19 15:49:12,107 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-19 15:49:12,107 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 15:49:12,108 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-19 15:49:12,108 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-19 15:49:12,109 INFO L87 Difference]: Start difference. First operand 106227 states and 163537 transitions. Second operand has 3 states, 3 states have (on average 63.0) internal successors, (189), 3 states have internal predecessors, (189), 3 states have call successors, (20), 3 states have call predecessors, (20), 3 states have return successors, (19), 3 states have call predecessors, (19), 3 states have call successors, (19) [2021-11-19 15:49:18,411 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 15:49:18,411 INFO L93 Difference]: Finished difference Result 313852 states and 487642 transitions. [2021-11-19 15:49:18,412 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-19 15:49:18,412 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 63.0) internal successors, (189), 3 states have internal predecessors, (189), 3 states have call successors, (20), 3 states have call predecessors, (20), 3 states have return successors, (19), 3 states have call predecessors, (19), 3 states have call successors, (19) Word has length 220 [2021-11-19 15:49:18,412 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 15:49:19,274 INFO L225 Difference]: With dead ends: 313852 [2021-11-19 15:49:19,274 INFO L226 Difference]: Without dead ends: 209271 [2021-11-19 15:49:19,466 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 446 GetRequests, 440 SyntacticMatches, 1 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-19 15:49:19,467 INFO L933 BasicCegarLoop]: 3334 mSDtfsCounter, 3475 mSDsluCounter, 294 mSDsCounter, 0 mSdLazyCounter, 319 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3475 SdHoareTripleChecker+Valid, 3582 SdHoareTripleChecker+Invalid, 321 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 319 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-19 15:49:19,467 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3475 Valid, 3582 Invalid, 321 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 319 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-19 15:49:19,654 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 209271 states.