./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/seq-mthreaded-reduced/pals_floodmax.3.1.ufo.BOUNDED-6.pals.c.v+cfa-reducer.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 9ad7fb26 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3b9f9fce-e857-48a7-b23a-7496c2ad497c/bin/utaipan-aC7eJsxGYH/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3b9f9fce-e857-48a7-b23a-7496c2ad497c/bin/utaipan-aC7eJsxGYH/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3b9f9fce-e857-48a7-b23a-7496c2ad497c/bin/utaipan-aC7eJsxGYH/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3b9f9fce-e857-48a7-b23a-7496c2ad497c/bin/utaipan-aC7eJsxGYH/config/TaipanReach.xml -i ../../sv-benchmarks/c/seq-mthreaded-reduced/pals_floodmax.3.1.ufo.BOUNDED-6.pals.c.v+cfa-reducer.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3b9f9fce-e857-48a7-b23a-7496c2ad497c/bin/utaipan-aC7eJsxGYH/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3b9f9fce-e857-48a7-b23a-7496c2ad497c/bin/utaipan-aC7eJsxGYH --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 81fc918e1fab83089d488e981f8e2fc461bd57864199cdfbd6916c01a7d86fab --- Real Ultimate output --- This is Ultimate 0.2.1-dev-9ad7fb2 [2021-11-03 04:56:43,710 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-03 04:56:43,713 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-03 04:56:43,765 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-03 04:56:43,766 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-03 04:56:43,770 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-03 04:56:43,771 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-03 04:56:43,775 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-03 04:56:43,778 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-03 04:56:43,783 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-03 04:56:43,784 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-03 04:56:43,786 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-03 04:56:43,786 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-03 04:56:43,789 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-03 04:56:43,791 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-03 04:56:43,795 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-03 04:56:43,797 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-03 04:56:43,798 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-03 04:56:43,803 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-03 04:56:43,810 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-03 04:56:43,812 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-03 04:56:43,813 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-03 04:56:43,816 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-03 04:56:43,817 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-03 04:56:43,826 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-03 04:56:43,826 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-03 04:56:43,827 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-03 04:56:43,829 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-03 04:56:43,829 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-03 04:56:43,831 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-03 04:56:43,831 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-03 04:56:43,832 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-03 04:56:43,834 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-03 04:56:43,835 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-03 04:56:43,837 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-03 04:56:43,837 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-03 04:56:43,838 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-03 04:56:43,838 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-03 04:56:43,838 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-03 04:56:43,839 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-03 04:56:43,840 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-03 04:56:43,841 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3b9f9fce-e857-48a7-b23a-7496c2ad497c/bin/utaipan-aC7eJsxGYH/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-03 04:56:43,880 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-03 04:56:43,880 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-03 04:56:43,881 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-03 04:56:43,882 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-03 04:56:43,882 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-03 04:56:43,882 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-03 04:56:43,882 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-03 04:56:43,883 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-03 04:56:43,883 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-03 04:56:43,883 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-03 04:56:43,890 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-03 04:56:43,890 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-03 04:56:43,890 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-03 04:56:43,891 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-03 04:56:43,891 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2021-11-03 04:56:43,892 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-03 04:56:43,892 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-03 04:56:43,892 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-03 04:56:43,893 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-03 04:56:43,893 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-03 04:56:43,893 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-03 04:56:43,893 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-03 04:56:43,893 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-03 04:56:43,894 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-03 04:56:43,894 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-03 04:56:43,894 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-03 04:56:43,894 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-03 04:56:43,895 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-03 04:56:43,895 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-03 04:56:43,896 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-03 04:56:43,897 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-03 04:56:43,897 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-03 04:56:43,897 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-03 04:56:43,897 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-03 04:56:43,898 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-03 04:56:43,898 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-03 04:56:43,898 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-03 04:56:43,898 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-03 04:56:43,899 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-03 04:56:43,899 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_3b9f9fce-e857-48a7-b23a-7496c2ad497c/bin/utaipan-aC7eJsxGYH/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3b9f9fce-e857-48a7-b23a-7496c2ad497c/bin/utaipan-aC7eJsxGYH Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 81fc918e1fab83089d488e981f8e2fc461bd57864199cdfbd6916c01a7d86fab [2021-11-03 04:56:44,165 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-03 04:56:44,195 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-03 04:56:44,198 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-03 04:56:44,200 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-03 04:56:44,200 INFO L275 PluginConnector]: CDTParser initialized [2021-11-03 04:56:44,201 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3b9f9fce-e857-48a7-b23a-7496c2ad497c/bin/utaipan-aC7eJsxGYH/../../sv-benchmarks/c/seq-mthreaded-reduced/pals_floodmax.3.1.ufo.BOUNDED-6.pals.c.v+cfa-reducer.c [2021-11-03 04:56:44,279 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3b9f9fce-e857-48a7-b23a-7496c2ad497c/bin/utaipan-aC7eJsxGYH/data/61390958b/e7c0a9f3d47c4767a9ebb35bb3ad2807/FLAGc5edd7403 [2021-11-03 04:56:44,750 INFO L306 CDTParser]: Found 1 translation units. [2021-11-03 04:56:44,750 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3b9f9fce-e857-48a7-b23a-7496c2ad497c/sv-benchmarks/c/seq-mthreaded-reduced/pals_floodmax.3.1.ufo.BOUNDED-6.pals.c.v+cfa-reducer.c [2021-11-03 04:56:44,762 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3b9f9fce-e857-48a7-b23a-7496c2ad497c/bin/utaipan-aC7eJsxGYH/data/61390958b/e7c0a9f3d47c4767a9ebb35bb3ad2807/FLAGc5edd7403 [2021-11-03 04:56:45,101 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3b9f9fce-e857-48a7-b23a-7496c2ad497c/bin/utaipan-aC7eJsxGYH/data/61390958b/e7c0a9f3d47c4767a9ebb35bb3ad2807 [2021-11-03 04:56:45,104 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-03 04:56:45,105 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-03 04:56:45,110 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-03 04:56:45,110 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-03 04:56:45,114 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-03 04:56:45,115 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 03.11 04:56:45" (1/1) ... [2021-11-03 04:56:45,116 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6e1dc5f5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 04:56:45, skipping insertion in model container [2021-11-03 04:56:45,116 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 03.11 04:56:45" (1/1) ... [2021-11-03 04:56:45,123 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-03 04:56:45,179 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-03 04:56:45,395 WARN L228 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_3b9f9fce-e857-48a7-b23a-7496c2ad497c/sv-benchmarks/c/seq-mthreaded-reduced/pals_floodmax.3.1.ufo.BOUNDED-6.pals.c.v+cfa-reducer.c[7067,7080] [2021-11-03 04:56:45,426 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-03 04:56:45,440 INFO L203 MainTranslator]: Completed pre-run [2021-11-03 04:56:45,488 WARN L228 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_3b9f9fce-e857-48a7-b23a-7496c2ad497c/sv-benchmarks/c/seq-mthreaded-reduced/pals_floodmax.3.1.ufo.BOUNDED-6.pals.c.v+cfa-reducer.c[7067,7080] [2021-11-03 04:56:45,511 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-03 04:56:45,531 INFO L208 MainTranslator]: Completed translation [2021-11-03 04:56:45,531 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 04:56:45 WrapperNode [2021-11-03 04:56:45,531 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-03 04:56:45,532 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-03 04:56:45,533 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-03 04:56:45,533 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-03 04:56:45,540 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 04:56:45" (1/1) ... [2021-11-03 04:56:45,552 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 04:56:45" (1/1) ... [2021-11-03 04:56:45,590 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-03 04:56:45,591 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-03 04:56:45,592 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-03 04:56:45,592 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-03 04:56:45,600 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 04:56:45" (1/1) ... [2021-11-03 04:56:45,601 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 04:56:45" (1/1) ... [2021-11-03 04:56:45,619 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 04:56:45" (1/1) ... [2021-11-03 04:56:45,620 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 04:56:45" (1/1) ... [2021-11-03 04:56:45,630 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 04:56:45" (1/1) ... [2021-11-03 04:56:45,637 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 04:56:45" (1/1) ... [2021-11-03 04:56:45,640 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 04:56:45" (1/1) ... [2021-11-03 04:56:45,646 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-03 04:56:45,647 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-03 04:56:45,647 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-03 04:56:45,647 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-03 04:56:45,648 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 04:56:45" (1/1) ... [2021-11-03 04:56:45,654 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-03 04:56:45,669 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3b9f9fce-e857-48a7-b23a-7496c2ad497c/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 04:56:45,680 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3b9f9fce-e857-48a7-b23a-7496c2ad497c/bin/utaipan-aC7eJsxGYH/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-03 04:56:45,695 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3b9f9fce-e857-48a7-b23a-7496c2ad497c/bin/utaipan-aC7eJsxGYH/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-03 04:56:45,740 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-03 04:56:45,740 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-03 04:56:45,740 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-03 04:56:45,740 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-03 04:56:47,109 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-03 04:56:47,110 INFO L299 CfgBuilder]: Removed 4 assume(true) statements. [2021-11-03 04:56:47,145 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.11 04:56:47 BoogieIcfgContainer [2021-11-03 04:56:47,146 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-03 04:56:47,150 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-03 04:56:47,150 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-03 04:56:47,153 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-03 04:56:47,154 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 03.11 04:56:45" (1/3) ... [2021-11-03 04:56:47,155 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@31a0fca8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 03.11 04:56:47, skipping insertion in model container [2021-11-03 04:56:47,155 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 04:56:45" (2/3) ... [2021-11-03 04:56:47,155 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@31a0fca8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 03.11 04:56:47, skipping insertion in model container [2021-11-03 04:56:47,155 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.11 04:56:47" (3/3) ... [2021-11-03 04:56:47,157 INFO L111 eAbstractionObserver]: Analyzing ICFG pals_floodmax.3.1.ufo.BOUNDED-6.pals.c.v+cfa-reducer.c [2021-11-03 04:56:47,164 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-03 04:56:47,165 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-03 04:56:47,213 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-03 04:56:47,221 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 [2021-11-03 04:56:47,222 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-03 04:56:47,244 INFO L276 IsEmpty]: Start isEmpty. Operand has 81 states, 79 states have (on average 1.7468354430379747) internal successors, (138), 80 states have internal predecessors, (138), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:56:47,250 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-11-03 04:56:47,250 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:56:47,251 INFO L513 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] [2021-11-03 04:56:47,251 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 04:56:47,256 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:56:47,256 INFO L85 PathProgramCache]: Analyzing trace with hash -660757956, now seen corresponding path program 1 times [2021-11-03 04:56:47,266 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:56:47,267 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1712615087] [2021-11-03 04:56:47,267 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:56:47,268 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:56:47,504 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:56:47,617 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:56:47,617 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:56:47,618 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1712615087] [2021-11-03 04:56:47,619 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1712615087] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-03 04:56:47,619 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-03 04:56:47,619 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-03 04:56:47,621 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [218076279] [2021-11-03 04:56:47,626 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-03 04:56:47,626 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:56:47,639 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-03 04:56:47,640 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-03 04:56:47,642 INFO L87 Difference]: Start difference. First operand has 81 states, 79 states have (on average 1.7468354430379747) internal successors, (138), 80 states have internal predecessors, (138), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 3 states have (on average 10.666666666666666) internal successors, (32), 3 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:56:47,714 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:56:47,714 INFO L93 Difference]: Finished difference Result 185 states and 305 transitions. [2021-11-03 04:56:47,715 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-03 04:56:47,716 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 10.666666666666666) internal successors, (32), 3 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 32 [2021-11-03 04:56:47,717 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:56:47,731 INFO L225 Difference]: With dead ends: 185 [2021-11-03 04:56:47,731 INFO L226 Difference]: Without dead ends: 123 [2021-11-03 04:56:47,734 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-03 04:56:47,752 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 123 states. [2021-11-03 04:56:47,795 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 123 to 121. [2021-11-03 04:56:47,797 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 121 states, 120 states have (on average 1.5166666666666666) internal successors, (182), 120 states have internal predecessors, (182), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:56:47,799 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 121 states to 121 states and 182 transitions. [2021-11-03 04:56:47,800 INFO L78 Accepts]: Start accepts. Automaton has 121 states and 182 transitions. Word has length 32 [2021-11-03 04:56:47,800 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:56:47,801 INFO L470 AbstractCegarLoop]: Abstraction has 121 states and 182 transitions. [2021-11-03 04:56:47,801 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 10.666666666666666) internal successors, (32), 3 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:56:47,801 INFO L276 IsEmpty]: Start isEmpty. Operand 121 states and 182 transitions. [2021-11-03 04:56:47,803 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-11-03 04:56:47,803 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:56:47,803 INFO L513 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] [2021-11-03 04:56:47,804 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-03 04:56:47,804 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 04:56:47,805 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:56:47,805 INFO L85 PathProgramCache]: Analyzing trace with hash -252292527, now seen corresponding path program 1 times [2021-11-03 04:56:47,805 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:56:47,806 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2073610595] [2021-11-03 04:56:47,806 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:56:47,806 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:56:47,855 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:56:47,916 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:56:47,916 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:56:47,916 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2073610595] [2021-11-03 04:56:47,917 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2073610595] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-03 04:56:47,917 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-03 04:56:47,917 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-03 04:56:47,918 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2074888618] [2021-11-03 04:56:47,919 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-03 04:56:47,919 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:56:47,920 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-03 04:56:47,920 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-03 04:56:47,921 INFO L87 Difference]: Start difference. First operand 121 states and 182 transitions. Second operand has 3 states, 3 states have (on average 11.333333333333334) internal successors, (34), 3 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:56:47,973 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:56:47,974 INFO L93 Difference]: Finished difference Result 276 states and 431 transitions. [2021-11-03 04:56:47,974 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-03 04:56:47,974 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 11.333333333333334) internal successors, (34), 3 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 34 [2021-11-03 04:56:47,975 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:56:47,976 INFO L225 Difference]: With dead ends: 276 [2021-11-03 04:56:47,977 INFO L226 Difference]: Without dead ends: 178 [2021-11-03 04:56:47,978 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-03 04:56:47,979 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 178 states. [2021-11-03 04:56:47,995 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 178 to 176. [2021-11-03 04:56:47,996 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 176 states, 175 states have (on average 1.5257142857142858) internal successors, (267), 175 states have internal predecessors, (267), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:56:47,999 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 176 states to 176 states and 267 transitions. [2021-11-03 04:56:47,999 INFO L78 Accepts]: Start accepts. Automaton has 176 states and 267 transitions. Word has length 34 [2021-11-03 04:56:47,999 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:56:48,000 INFO L470 AbstractCegarLoop]: Abstraction has 176 states and 267 transitions. [2021-11-03 04:56:48,000 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 11.333333333333334) internal successors, (34), 3 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:56:48,000 INFO L276 IsEmpty]: Start isEmpty. Operand 176 states and 267 transitions. [2021-11-03 04:56:48,001 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-11-03 04:56:48,002 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:56:48,002 INFO L513 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] [2021-11-03 04:56:48,002 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-03 04:56:48,003 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 04:56:48,003 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:56:48,003 INFO L85 PathProgramCache]: Analyzing trace with hash -206472962, now seen corresponding path program 1 times [2021-11-03 04:56:48,004 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:56:48,004 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [339170413] [2021-11-03 04:56:48,004 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:56:48,004 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:56:48,044 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:56:48,136 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:56:48,141 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:56:48,141 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [339170413] [2021-11-03 04:56:48,141 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [339170413] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-03 04:56:48,142 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-03 04:56:48,142 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-03 04:56:48,142 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1429958234] [2021-11-03 04:56:48,143 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-03 04:56:48,143 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:56:48,143 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-03 04:56:48,144 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-03 04:56:48,144 INFO L87 Difference]: Start difference. First operand 176 states and 267 transitions. Second operand has 3 states, 3 states have (on average 12.0) internal successors, (36), 3 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:56:48,187 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:56:48,187 INFO L93 Difference]: Finished difference Result 442 states and 694 transitions. [2021-11-03 04:56:48,188 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-03 04:56:48,188 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 12.0) internal successors, (36), 3 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 36 [2021-11-03 04:56:48,188 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:56:48,191 INFO L225 Difference]: With dead ends: 442 [2021-11-03 04:56:48,191 INFO L226 Difference]: Without dead ends: 291 [2021-11-03 04:56:48,193 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-03 04:56:48,193 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 291 states. [2021-11-03 04:56:48,244 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 291 to 289. [2021-11-03 04:56:48,246 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 289 states, 288 states have (on average 1.5555555555555556) internal successors, (448), 288 states have internal predecessors, (448), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:56:48,248 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 289 states to 289 states and 448 transitions. [2021-11-03 04:56:48,248 INFO L78 Accepts]: Start accepts. Automaton has 289 states and 448 transitions. Word has length 36 [2021-11-03 04:56:48,248 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:56:48,249 INFO L470 AbstractCegarLoop]: Abstraction has 289 states and 448 transitions. [2021-11-03 04:56:48,249 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 12.0) internal successors, (36), 3 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:56:48,249 INFO L276 IsEmpty]: Start isEmpty. Operand 289 states and 448 transitions. [2021-11-03 04:56:48,251 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2021-11-03 04:56:48,251 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:56:48,251 INFO L513 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] [2021-11-03 04:56:48,251 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-03 04:56:48,252 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 04:56:48,252 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:56:48,252 INFO L85 PathProgramCache]: Analyzing trace with hash -1818136084, now seen corresponding path program 1 times [2021-11-03 04:56:48,252 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:56:48,253 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1607346811] [2021-11-03 04:56:48,253 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:56:48,253 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:56:48,280 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:56:48,315 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:56:48,315 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:56:48,316 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1607346811] [2021-11-03 04:56:48,316 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1607346811] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-03 04:56:48,316 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-03 04:56:48,316 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-03 04:56:48,317 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1205337842] [2021-11-03 04:56:48,317 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-03 04:56:48,317 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:56:48,318 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-03 04:56:48,318 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-03 04:56:48,319 INFO L87 Difference]: Start difference. First operand 289 states and 448 transitions. Second operand has 3 states, 3 states have (on average 12.666666666666666) internal successors, (38), 3 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:56:48,358 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:56:48,358 INFO L93 Difference]: Finished difference Result 717 states and 1132 transitions. [2021-11-03 04:56:48,358 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-03 04:56:48,359 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 12.666666666666666) internal successors, (38), 3 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 38 [2021-11-03 04:56:48,359 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:56:48,363 INFO L225 Difference]: With dead ends: 717 [2021-11-03 04:56:48,363 INFO L226 Difference]: Without dead ends: 453 [2021-11-03 04:56:48,365 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-03 04:56:48,366 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 453 states. [2021-11-03 04:56:48,397 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 453 to 451. [2021-11-03 04:56:48,399 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 451 states, 450 states have (on average 1.5666666666666667) internal successors, (705), 450 states have internal predecessors, (705), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:56:48,401 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 451 states to 451 states and 705 transitions. [2021-11-03 04:56:48,401 INFO L78 Accepts]: Start accepts. Automaton has 451 states and 705 transitions. Word has length 38 [2021-11-03 04:56:48,402 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:56:48,402 INFO L470 AbstractCegarLoop]: Abstraction has 451 states and 705 transitions. [2021-11-03 04:56:48,402 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 12.666666666666666) internal successors, (38), 3 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:56:48,403 INFO L276 IsEmpty]: Start isEmpty. Operand 451 states and 705 transitions. [2021-11-03 04:56:48,404 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-11-03 04:56:48,404 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:56:48,404 INFO L513 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] [2021-11-03 04:56:48,405 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-11-03 04:56:48,405 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 04:56:48,405 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:56:48,406 INFO L85 PathProgramCache]: Analyzing trace with hash -241633377, now seen corresponding path program 1 times [2021-11-03 04:56:48,406 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:56:48,406 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [480634750] [2021-11-03 04:56:48,406 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:56:48,407 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:56:48,429 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:56:48,475 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:56:48,475 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:56:48,475 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [480634750] [2021-11-03 04:56:48,475 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [480634750] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-03 04:56:48,476 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-03 04:56:48,477 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-03 04:56:48,477 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1748433466] [2021-11-03 04:56:48,478 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-03 04:56:48,478 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:56:48,480 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-03 04:56:48,481 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-03 04:56:48,481 INFO L87 Difference]: Start difference. First operand 451 states and 705 transitions. Second operand has 3 states, 3 states have (on average 13.333333333333334) internal successors, (40), 3 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:56:48,541 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:56:48,542 INFO L93 Difference]: Finished difference Result 1169 states and 1856 transitions. [2021-11-03 04:56:48,542 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-03 04:56:48,543 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 13.333333333333334) internal successors, (40), 3 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 40 [2021-11-03 04:56:48,544 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:56:48,549 INFO L225 Difference]: With dead ends: 1169 [2021-11-03 04:56:48,550 INFO L226 Difference]: Without dead ends: 756 [2021-11-03 04:56:48,554 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-03 04:56:48,556 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 756 states. [2021-11-03 04:56:48,601 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 756 to 754. [2021-11-03 04:56:48,603 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 754 states, 753 states have (on average 1.5737051792828685) internal successors, (1185), 753 states have internal predecessors, (1185), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:56:48,606 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 754 states to 754 states and 1185 transitions. [2021-11-03 04:56:48,607 INFO L78 Accepts]: Start accepts. Automaton has 754 states and 1185 transitions. Word has length 40 [2021-11-03 04:56:48,607 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:56:48,608 INFO L470 AbstractCegarLoop]: Abstraction has 754 states and 1185 transitions. [2021-11-03 04:56:48,608 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 13.333333333333334) internal successors, (40), 3 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:56:48,608 INFO L276 IsEmpty]: Start isEmpty. Operand 754 states and 1185 transitions. [2021-11-03 04:56:48,613 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2021-11-03 04:56:48,613 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:56:48,613 INFO L513 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] [2021-11-03 04:56:48,613 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-11-03 04:56:48,614 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 04:56:48,622 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:56:48,622 INFO L85 PathProgramCache]: Analyzing trace with hash -1750351621, now seen corresponding path program 1 times [2021-11-03 04:56:48,622 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:56:48,623 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [839096326] [2021-11-03 04:56:48,623 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:56:48,623 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:56:48,662 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:56:48,714 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:56:48,716 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:56:48,716 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [839096326] [2021-11-03 04:56:48,717 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [839096326] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-03 04:56:48,717 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-03 04:56:48,718 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-03 04:56:48,719 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1581690696] [2021-11-03 04:56:48,719 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-03 04:56:48,720 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:56:48,721 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-03 04:56:48,725 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-03 04:56:48,726 INFO L87 Difference]: Start difference. First operand 754 states and 1185 transitions. Second operand has 3 states, 3 states have (on average 14.0) internal successors, (42), 3 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:56:48,802 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:56:48,802 INFO L93 Difference]: Finished difference Result 1896 states and 3006 transitions. [2021-11-03 04:56:48,802 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-03 04:56:48,803 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 14.0) internal successors, (42), 3 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 42 [2021-11-03 04:56:48,803 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:56:48,811 INFO L225 Difference]: With dead ends: 1896 [2021-11-03 04:56:48,811 INFO L226 Difference]: Without dead ends: 1180 [2021-11-03 04:56:48,813 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-03 04:56:48,815 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1180 states. [2021-11-03 04:56:48,874 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1180 to 1178. [2021-11-03 04:56:48,877 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1178 states, 1177 states have (on average 1.5760407816482582) internal successors, (1855), 1177 states have internal predecessors, (1855), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:56:48,882 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1178 states to 1178 states and 1855 transitions. [2021-11-03 04:56:48,882 INFO L78 Accepts]: Start accepts. Automaton has 1178 states and 1855 transitions. Word has length 42 [2021-11-03 04:56:48,884 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:56:48,884 INFO L470 AbstractCegarLoop]: Abstraction has 1178 states and 1855 transitions. [2021-11-03 04:56:48,884 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 14.0) internal successors, (42), 3 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:56:48,885 INFO L276 IsEmpty]: Start isEmpty. Operand 1178 states and 1855 transitions. [2021-11-03 04:56:48,888 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-11-03 04:56:48,888 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:56:48,888 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 04:56:48,888 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-11-03 04:56:48,889 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 04:56:48,889 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:56:48,889 INFO L85 PathProgramCache]: Analyzing trace with hash 1848700648, now seen corresponding path program 1 times [2021-11-03 04:56:48,889 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:56:48,893 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [742576171] [2021-11-03 04:56:48,894 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:56:48,895 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:56:48,926 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:56:48,998 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:56:48,999 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:56:48,999 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [742576171] [2021-11-03 04:56:48,999 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [742576171] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-03 04:56:49,000 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-03 04:56:49,000 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-03 04:56:49,000 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [490929651] [2021-11-03 04:56:49,002 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-03 04:56:49,002 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:56:49,002 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-03 04:56:49,002 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-03 04:56:49,003 INFO L87 Difference]: Start difference. First operand 1178 states and 1855 transitions. Second operand has 5 states, 5 states have (on average 8.8) internal successors, (44), 5 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:56:49,299 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:56:49,299 INFO L93 Difference]: Finished difference Result 3006 states and 4744 transitions. [2021-11-03 04:56:49,300 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-03 04:56:49,300 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 8.8) internal successors, (44), 5 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 44 [2021-11-03 04:56:49,300 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:56:49,312 INFO L225 Difference]: With dead ends: 3006 [2021-11-03 04:56:49,312 INFO L226 Difference]: Without dead ends: 1879 [2021-11-03 04:56:49,314 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2021-11-03 04:56:49,317 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1879 states. [2021-11-03 04:56:49,426 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1879 to 1869. [2021-11-03 04:56:49,431 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1869 states, 1868 states have (on average 1.5637044967880085) internal successors, (2921), 1868 states have internal predecessors, (2921), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:56:49,440 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1869 states to 1869 states and 2921 transitions. [2021-11-03 04:56:49,440 INFO L78 Accepts]: Start accepts. Automaton has 1869 states and 2921 transitions. Word has length 44 [2021-11-03 04:56:49,440 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:56:49,440 INFO L470 AbstractCegarLoop]: Abstraction has 1869 states and 2921 transitions. [2021-11-03 04:56:49,441 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 8.8) internal successors, (44), 5 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:56:49,441 INFO L276 IsEmpty]: Start isEmpty. Operand 1869 states and 2921 transitions. [2021-11-03 04:56:49,441 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-11-03 04:56:49,441 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:56:49,441 INFO L513 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] [2021-11-03 04:56:49,442 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-11-03 04:56:49,442 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 04:56:49,442 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:56:49,442 INFO L85 PathProgramCache]: Analyzing trace with hash 1412641022, now seen corresponding path program 1 times [2021-11-03 04:56:49,442 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:56:49,443 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [968663905] [2021-11-03 04:56:49,443 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:56:49,443 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:56:49,457 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:56:49,510 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:56:49,510 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:56:49,510 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [968663905] [2021-11-03 04:56:49,511 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [968663905] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-03 04:56:49,511 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-03 04:56:49,511 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-03 04:56:49,511 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [43263638] [2021-11-03 04:56:49,511 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-03 04:56:49,512 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:56:49,512 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-03 04:56:49,512 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-03 04:56:49,513 INFO L87 Difference]: Start difference. First operand 1869 states and 2921 transitions. Second operand has 4 states, 4 states have (on average 11.25) internal successors, (45), 4 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:56:49,683 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:56:49,683 INFO L93 Difference]: Finished difference Result 3689 states and 5780 transitions. [2021-11-03 04:56:49,683 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-03 04:56:49,684 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 11.25) internal successors, (45), 4 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 45 [2021-11-03 04:56:49,685 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:56:49,697 INFO L225 Difference]: With dead ends: 3689 [2021-11-03 04:56:49,697 INFO L226 Difference]: Without dead ends: 1871 [2021-11-03 04:56:49,700 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-03 04:56:49,703 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1871 states. [2021-11-03 04:56:49,824 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1871 to 1869. [2021-11-03 04:56:49,829 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1869 states, 1868 states have (on average 1.5572805139186296) internal successors, (2909), 1868 states have internal predecessors, (2909), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:56:49,838 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1869 states to 1869 states and 2909 transitions. [2021-11-03 04:56:49,838 INFO L78 Accepts]: Start accepts. Automaton has 1869 states and 2909 transitions. Word has length 45 [2021-11-03 04:56:49,839 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:56:49,839 INFO L470 AbstractCegarLoop]: Abstraction has 1869 states and 2909 transitions. [2021-11-03 04:56:49,839 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 11.25) internal successors, (45), 4 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:56:49,839 INFO L276 IsEmpty]: Start isEmpty. Operand 1869 states and 2909 transitions. [2021-11-03 04:56:49,840 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-11-03 04:56:49,840 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:56:49,840 INFO L513 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] [2021-11-03 04:56:49,841 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-11-03 04:56:49,841 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 04:56:49,841 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:56:49,841 INFO L85 PathProgramCache]: Analyzing trace with hash 784252527, now seen corresponding path program 1 times [2021-11-03 04:56:49,841 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:56:49,842 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1802413239] [2021-11-03 04:56:49,842 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:56:49,842 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:56:49,858 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:56:49,925 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:56:49,925 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:56:49,925 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1802413239] [2021-11-03 04:56:49,925 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1802413239] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-03 04:56:49,926 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-03 04:56:49,926 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-03 04:56:49,926 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1542801214] [2021-11-03 04:56:49,926 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-03 04:56:49,926 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:56:49,927 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-03 04:56:49,927 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-03 04:56:49,927 INFO L87 Difference]: Start difference. First operand 1869 states and 2909 transitions. Second operand has 4 states, 4 states have (on average 11.5) internal successors, (46), 4 states have internal predecessors, (46), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:56:50,099 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:56:50,099 INFO L93 Difference]: Finished difference Result 3689 states and 5756 transitions. [2021-11-03 04:56:50,100 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-03 04:56:50,100 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 11.5) internal successors, (46), 4 states have internal predecessors, (46), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 46 [2021-11-03 04:56:50,101 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:56:50,112 INFO L225 Difference]: With dead ends: 3689 [2021-11-03 04:56:50,112 INFO L226 Difference]: Without dead ends: 1871 [2021-11-03 04:56:50,115 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-03 04:56:50,118 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1871 states. [2021-11-03 04:56:50,217 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1871 to 1869. [2021-11-03 04:56:50,222 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1869 states, 1868 states have (on average 1.5508565310492506) internal successors, (2897), 1868 states have internal predecessors, (2897), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:56:50,230 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1869 states to 1869 states and 2897 transitions. [2021-11-03 04:56:50,231 INFO L78 Accepts]: Start accepts. Automaton has 1869 states and 2897 transitions. Word has length 46 [2021-11-03 04:56:50,231 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:56:50,231 INFO L470 AbstractCegarLoop]: Abstraction has 1869 states and 2897 transitions. [2021-11-03 04:56:50,231 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 11.5) internal successors, (46), 4 states have internal predecessors, (46), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:56:50,231 INFO L276 IsEmpty]: Start isEmpty. Operand 1869 states and 2897 transitions. [2021-11-03 04:56:50,232 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-11-03 04:56:50,232 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:56:50,232 INFO L513 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] [2021-11-03 04:56:50,232 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-11-03 04:56:50,232 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 04:56:50,233 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:56:50,233 INFO L85 PathProgramCache]: Analyzing trace with hash -1511363611, now seen corresponding path program 1 times [2021-11-03 04:56:50,233 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:56:50,233 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1066019283] [2021-11-03 04:56:50,233 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:56:50,233 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:56:50,248 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:56:50,278 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:56:50,278 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:56:50,278 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1066019283] [2021-11-03 04:56:50,278 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1066019283] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-03 04:56:50,279 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-03 04:56:50,279 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-03 04:56:50,279 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [111356717] [2021-11-03 04:56:50,279 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-03 04:56:50,279 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:56:50,280 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-03 04:56:50,280 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-03 04:56:50,280 INFO L87 Difference]: Start difference. First operand 1869 states and 2897 transitions. Second operand has 4 states, 4 states have (on average 11.75) internal successors, (47), 4 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:56:50,485 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:56:50,485 INFO L93 Difference]: Finished difference Result 3689 states and 5732 transitions. [2021-11-03 04:56:50,486 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-03 04:56:50,486 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 11.75) internal successors, (47), 4 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 47 [2021-11-03 04:56:50,486 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:56:50,497 INFO L225 Difference]: With dead ends: 3689 [2021-11-03 04:56:50,497 INFO L226 Difference]: Without dead ends: 1871 [2021-11-03 04:56:50,500 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-03 04:56:50,502 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1871 states. [2021-11-03 04:56:50,605 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1871 to 1869. [2021-11-03 04:56:50,611 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1869 states, 1868 states have (on average 1.5444325481798715) internal successors, (2885), 1868 states have internal predecessors, (2885), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:56:50,620 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1869 states to 1869 states and 2885 transitions. [2021-11-03 04:56:50,620 INFO L78 Accepts]: Start accepts. Automaton has 1869 states and 2885 transitions. Word has length 47 [2021-11-03 04:56:50,621 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:56:50,621 INFO L470 AbstractCegarLoop]: Abstraction has 1869 states and 2885 transitions. [2021-11-03 04:56:50,621 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 11.75) internal successors, (47), 4 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:56:50,621 INFO L276 IsEmpty]: Start isEmpty. Operand 1869 states and 2885 transitions. [2021-11-03 04:56:50,622 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-11-03 04:56:50,622 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:56:50,622 INFO L513 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] [2021-11-03 04:56:50,622 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2021-11-03 04:56:50,622 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 04:56:50,623 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:56:50,623 INFO L85 PathProgramCache]: Analyzing trace with hash 2056170934, now seen corresponding path program 1 times [2021-11-03 04:56:50,623 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:56:50,625 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [462658400] [2021-11-03 04:56:50,625 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:56:50,626 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:56:50,645 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:56:50,766 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:56:50,766 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:56:50,766 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [462658400] [2021-11-03 04:56:50,766 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [462658400] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-03 04:56:50,767 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-03 04:56:50,767 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-03 04:56:50,767 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [410424981] [2021-11-03 04:56:50,767 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-03 04:56:50,767 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:56:50,769 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-03 04:56:50,770 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-03 04:56:50,770 INFO L87 Difference]: Start difference. First operand 1869 states and 2885 transitions. Second operand has 5 states, 5 states have (on average 9.8) internal successors, (49), 5 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:56:51,007 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:56:51,007 INFO L93 Difference]: Finished difference Result 3689 states and 5708 transitions. [2021-11-03 04:56:51,007 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-03 04:56:51,008 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 9.8) internal successors, (49), 5 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 49 [2021-11-03 04:56:51,008 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:56:51,020 INFO L225 Difference]: With dead ends: 3689 [2021-11-03 04:56:51,020 INFO L226 Difference]: Without dead ends: 1871 [2021-11-03 04:56:51,023 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=14, Invalid=16, Unknown=0, NotChecked=0, Total=30 [2021-11-03 04:56:51,026 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1871 states. [2021-11-03 04:56:51,140 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1871 to 1869. [2021-11-03 04:56:51,146 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1869 states, 1868 states have (on average 1.5401498929336188) internal successors, (2877), 1868 states have internal predecessors, (2877), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:56:51,155 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1869 states to 1869 states and 2877 transitions. [2021-11-03 04:56:51,155 INFO L78 Accepts]: Start accepts. Automaton has 1869 states and 2877 transitions. Word has length 49 [2021-11-03 04:56:51,155 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:56:51,155 INFO L470 AbstractCegarLoop]: Abstraction has 1869 states and 2877 transitions. [2021-11-03 04:56:51,156 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 9.8) internal successors, (49), 5 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:56:51,156 INFO L276 IsEmpty]: Start isEmpty. Operand 1869 states and 2877 transitions. [2021-11-03 04:56:51,156 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-11-03 04:56:51,156 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:56:51,156 INFO L513 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] [2021-11-03 04:56:51,157 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2021-11-03 04:56:51,157 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 04:56:51,158 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:56:51,158 INFO L85 PathProgramCache]: Analyzing trace with hash -1483858783, now seen corresponding path program 1 times [2021-11-03 04:56:51,158 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:56:51,159 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1236426181] [2021-11-03 04:56:51,159 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:56:51,159 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:56:51,175 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:56:51,264 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:56:51,264 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:56:51,264 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1236426181] [2021-11-03 04:56:51,267 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1236426181] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-03 04:56:51,267 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-03 04:56:51,267 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-03 04:56:51,267 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [458058758] [2021-11-03 04:56:51,268 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-03 04:56:51,268 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:56:51,268 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-03 04:56:51,268 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-03 04:56:51,269 INFO L87 Difference]: Start difference. First operand 1869 states and 2877 transitions. Second operand has 5 states, 5 states have (on average 10.4) internal successors, (52), 5 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:56:51,584 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:56:51,585 INFO L93 Difference]: Finished difference Result 4710 states and 7235 transitions. [2021-11-03 04:56:51,585 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-03 04:56:51,585 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 10.4) internal successors, (52), 5 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 52 [2021-11-03 04:56:51,585 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:56:51,604 INFO L225 Difference]: With dead ends: 4710 [2021-11-03 04:56:51,604 INFO L226 Difference]: Without dead ends: 2892 [2021-11-03 04:56:51,608 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=14, Invalid=16, Unknown=0, NotChecked=0, Total=30 [2021-11-03 04:56:51,612 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2892 states. [2021-11-03 04:56:51,805 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2892 to 2890. [2021-11-03 04:56:51,812 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2890 states, 2889 states have (on average 1.5257874697127034) internal successors, (4408), 2889 states have internal predecessors, (4408), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:56:51,825 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2890 states to 2890 states and 4408 transitions. [2021-11-03 04:56:51,826 INFO L78 Accepts]: Start accepts. Automaton has 2890 states and 4408 transitions. Word has length 52 [2021-11-03 04:56:51,826 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:56:51,826 INFO L470 AbstractCegarLoop]: Abstraction has 2890 states and 4408 transitions. [2021-11-03 04:56:51,826 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 10.4) internal successors, (52), 5 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:56:51,826 INFO L276 IsEmpty]: Start isEmpty. Operand 2890 states and 4408 transitions. [2021-11-03 04:56:51,827 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2021-11-03 04:56:51,827 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:56:51,827 INFO L513 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] [2021-11-03 04:56:51,827 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2021-11-03 04:56:51,828 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 04:56:51,828 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:56:51,828 INFO L85 PathProgramCache]: Analyzing trace with hash 1254488821, now seen corresponding path program 1 times [2021-11-03 04:56:51,828 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:56:51,828 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2052543465] [2021-11-03 04:56:51,828 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:56:51,829 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:56:51,872 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:56:51,959 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-03 04:56:51,959 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:56:51,959 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2052543465] [2021-11-03 04:56:51,959 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2052543465] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-03 04:56:51,960 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-03 04:56:51,960 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-03 04:56:51,960 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [307431853] [2021-11-03 04:56:51,960 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-03 04:56:51,960 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-03 04:56:51,961 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-03 04:56:51,961 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-03 04:56:51,962 INFO L87 Difference]: Start difference. First operand 2890 states and 4408 transitions. Second operand has 6 states, 6 states have (on average 8.833333333333334) internal successors, (53), 6 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:56:52,331 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-03 04:56:52,331 INFO L93 Difference]: Finished difference Result 3549 states and 5384 transitions. [2021-11-03 04:56:52,332 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-03 04:56:52,332 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 8.833333333333334) internal successors, (53), 6 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 53 [2021-11-03 04:56:52,332 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-03 04:56:52,354 INFO L225 Difference]: With dead ends: 3549 [2021-11-03 04:56:52,354 INFO L226 Difference]: Without dead ends: 3547 [2021-11-03 04:56:52,356 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=30, Invalid=60, Unknown=0, NotChecked=0, Total=90 [2021-11-03 04:56:52,360 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3547 states. [2021-11-03 04:56:52,578 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3547 to 2896. [2021-11-03 04:56:52,585 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2896 states, 2895 states have (on average 1.5226252158894646) internal successors, (4408), 2895 states have internal predecessors, (4408), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:56:52,595 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2896 states to 2896 states and 4408 transitions. [2021-11-03 04:56:52,595 INFO L78 Accepts]: Start accepts. Automaton has 2896 states and 4408 transitions. Word has length 53 [2021-11-03 04:56:52,596 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-03 04:56:52,596 INFO L470 AbstractCegarLoop]: Abstraction has 2896 states and 4408 transitions. [2021-11-03 04:56:52,596 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 8.833333333333334) internal successors, (53), 6 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-03 04:56:52,596 INFO L276 IsEmpty]: Start isEmpty. Operand 2896 states and 4408 transitions. [2021-11-03 04:56:52,597 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-11-03 04:56:52,597 INFO L505 BasicCegarLoop]: Found error trace [2021-11-03 04:56:52,597 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-03 04:56:52,597 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2021-11-03 04:56:52,597 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-03 04:56:52,598 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-03 04:56:52,598 INFO L85 PathProgramCache]: Analyzing trace with hash -705426536, now seen corresponding path program 1 times [2021-11-03 04:56:52,598 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-03 04:56:52,598 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1411377201] [2021-11-03 04:56:52,598 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:56:52,598 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-03 04:56:52,660 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:56:53,855 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-03 04:56:53,855 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-03 04:56:53,855 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1411377201] [2021-11-03 04:56:53,856 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1411377201] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-03 04:56:53,856 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1167338127] [2021-11-03 04:56:53,856 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-03 04:56:53,856 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-03 04:56:53,856 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3b9f9fce-e857-48a7-b23a-7496c2ad497c/bin/utaipan-aC7eJsxGYH/z3 [2021-11-03 04:56:53,858 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3b9f9fce-e857-48a7-b23a-7496c2ad497c/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-03 04:56:53,870 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3b9f9fce-e857-48a7-b23a-7496c2ad497c/bin/utaipan-aC7eJsxGYH/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-03 04:56:54,057 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-03 04:56:54,080 INFO L263 TraceCheckSpWp]: Trace formula consists of 356 conjuncts, 21 conjunts are in the unsatisfiable core [2021-11-03 04:56:54,087 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-03 04:56:55,411 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-03 04:56:55,411 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-03 04:56:59,613 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-03 04:56:59,613 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1167338127] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-03 04:56:59,614 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1938848356] [2021-11-03 04:56:59,639 INFO L159 IcfgInterpreter]: Started Sifa with 54 locations of interest [2021-11-03 04:56:59,639 INFO L166 IcfgInterpreter]: Building call graph [2021-11-03 04:56:59,654 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-03 04:56:59,659 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-03 04:56:59,660 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-03 04:56:59,826 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:56:59,840 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:56:59,842 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:56:59,843 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 49 [2021-11-03 04:56:59,843 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:56:59,844 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:56:59,845 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 12 [2021-11-03 04:56:59,846 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:56:59,851 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:56:59,851 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 12 [2021-11-03 04:56:59,852 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-03 04:56:59,853 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-03 04:56:59,853 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 12 [2021-11-03 04:56:59,878 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 799 [2021-11-03 04:56:59,899 WARN L137 XnfTransformerHelper]: expecting exponential blowup for input size 12 [2021-11-03 04:57:17,712 WARN L176 XnfTransformerHelper]: Simplifying disjunction of 262144 conjuctions. This might take some time...