./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/seq-mthreaded/rekh_aso.3.M1.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 63182f13 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_90b0c209-26ec-43c3-9ca9-e3e408617533/bin/utaipan-vmNK8stdcF/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_90b0c209-26ec-43c3-9ca9-e3e408617533/bin/utaipan-vmNK8stdcF/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_90b0c209-26ec-43c3-9ca9-e3e408617533/bin/utaipan-vmNK8stdcF/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_90b0c209-26ec-43c3-9ca9-e3e408617533/bin/utaipan-vmNK8stdcF/config/TaipanReach.xml -i ../../sv-benchmarks/c/seq-mthreaded/rekh_aso.3.M1.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_90b0c209-26ec-43c3-9ca9-e3e408617533/bin/utaipan-vmNK8stdcF/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_90b0c209-26ec-43c3-9ca9-e3e408617533/bin/utaipan-vmNK8stdcF --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 90b68e26a5af3ce5617cd52d8dc6ef78c48b8482383cda056e3d7235d8bf007f --- Real Ultimate output --- This is Ultimate 0.2.1-dev-63182f1 [2021-11-12 23:16:15,420 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-12 23:16:15,423 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-12 23:16:15,475 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-12 23:16:15,476 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-12 23:16:15,481 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-12 23:16:15,483 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-12 23:16:15,488 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-12 23:16:15,491 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-12 23:16:15,498 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-12 23:16:15,500 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-12 23:16:15,502 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-12 23:16:15,502 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-12 23:16:15,505 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-12 23:16:15,507 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-12 23:16:15,515 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-12 23:16:15,518 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-12 23:16:15,519 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-12 23:16:15,521 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-12 23:16:15,528 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-12 23:16:15,531 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-12 23:16:15,532 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-12 23:16:15,535 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-12 23:16:15,536 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-12 23:16:15,542 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-12 23:16:15,543 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-12 23:16:15,543 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-12 23:16:15,545 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-12 23:16:15,546 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-12 23:16:15,547 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-12 23:16:15,548 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-12 23:16:15,548 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-12 23:16:15,550 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-12 23:16:15,551 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-12 23:16:15,553 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-12 23:16:15,553 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-12 23:16:15,554 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-12 23:16:15,554 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-12 23:16:15,554 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-12 23:16:15,555 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-12 23:16:15,556 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-12 23:16:15,557 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_90b0c209-26ec-43c3-9ca9-e3e408617533/bin/utaipan-vmNK8stdcF/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-12 23:16:15,582 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-12 23:16:15,583 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-12 23:16:15,583 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-12 23:16:15,584 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-12 23:16:15,584 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-12 23:16:15,584 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-12 23:16:15,584 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-12 23:16:15,584 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-12 23:16:15,585 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-12 23:16:15,585 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-12 23:16:15,585 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-12 23:16:15,585 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-12 23:16:15,585 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-12 23:16:15,586 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-12 23:16:15,586 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-12 23:16:15,586 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2021-11-12 23:16:15,587 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-12 23:16:15,587 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-12 23:16:15,587 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-12 23:16:15,587 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-12 23:16:15,587 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-12 23:16:15,588 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-12 23:16:15,588 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-12 23:16:15,588 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-12 23:16:15,588 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-12 23:16:15,588 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-12 23:16:15,589 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-12 23:16:15,589 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-12 23:16:15,589 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-12 23:16:15,589 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-12 23:16:15,589 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-12 23:16:15,590 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-12 23:16:15,590 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-12 23:16:15,590 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-12 23:16:15,590 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-12 23:16:15,591 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-12 23:16:15,591 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-12 23:16:15,591 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-12 23:16:15,591 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-12 23:16:15,591 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-12 23:16:15,591 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_90b0c209-26ec-43c3-9ca9-e3e408617533/bin/utaipan-vmNK8stdcF/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_90b0c209-26ec-43c3-9ca9-e3e408617533/bin/utaipan-vmNK8stdcF Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 90b68e26a5af3ce5617cd52d8dc6ef78c48b8482383cda056e3d7235d8bf007f [2021-11-12 23:16:15,850 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-12 23:16:15,877 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-12 23:16:15,880 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-12 23:16:15,882 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-12 23:16:15,882 INFO L275 PluginConnector]: CDTParser initialized [2021-11-12 23:16:15,884 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_90b0c209-26ec-43c3-9ca9-e3e408617533/bin/utaipan-vmNK8stdcF/../../sv-benchmarks/c/seq-mthreaded/rekh_aso.3.M1.c [2021-11-12 23:16:15,961 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_90b0c209-26ec-43c3-9ca9-e3e408617533/bin/utaipan-vmNK8stdcF/data/466dafb81/f1da66428eef40bea3706e8b9f6c30e0/FLAGa4d5d1425 [2021-11-12 23:16:16,694 INFO L306 CDTParser]: Found 1 translation units. [2021-11-12 23:16:16,695 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_90b0c209-26ec-43c3-9ca9-e3e408617533/sv-benchmarks/c/seq-mthreaded/rekh_aso.3.M1.c [2021-11-12 23:16:16,728 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_90b0c209-26ec-43c3-9ca9-e3e408617533/bin/utaipan-vmNK8stdcF/data/466dafb81/f1da66428eef40bea3706e8b9f6c30e0/FLAGa4d5d1425 [2021-11-12 23:16:16,824 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_90b0c209-26ec-43c3-9ca9-e3e408617533/bin/utaipan-vmNK8stdcF/data/466dafb81/f1da66428eef40bea3706e8b9f6c30e0 [2021-11-12 23:16:16,828 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-12 23:16:16,830 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-12 23:16:16,835 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-12 23:16:16,836 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-12 23:16:16,839 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-12 23:16:16,840 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 12.11 11:16:16" (1/1) ... [2021-11-12 23:16:16,843 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@18f8a0ea and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 11:16:16, skipping insertion in model container [2021-11-12 23:16:16,844 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 12.11 11:16:16" (1/1) ... [2021-11-12 23:16:16,851 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-12 23:16:16,986 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-12 23:16:17,236 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_90b0c209-26ec-43c3-9ca9-e3e408617533/sv-benchmarks/c/seq-mthreaded/rekh_aso.3.M1.c[1806,1819] [2021-11-12 23:16:17,771 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-12 23:16:17,782 INFO L203 MainTranslator]: Completed pre-run [2021-11-12 23:16:17,795 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_90b0c209-26ec-43c3-9ca9-e3e408617533/sv-benchmarks/c/seq-mthreaded/rekh_aso.3.M1.c[1806,1819] [2021-11-12 23:16:18,186 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-12 23:16:18,229 INFO L208 MainTranslator]: Completed translation [2021-11-12 23:16:18,229 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 11:16:18 WrapperNode [2021-11-12 23:16:18,230 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-12 23:16:18,231 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-12 23:16:18,231 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-12 23:16:18,231 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-12 23:16:18,239 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 11:16:18" (1/1) ... [2021-11-12 23:16:18,388 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 11:16:18" (1/1) ... [2021-11-12 23:16:18,772 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-12 23:16:18,773 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-12 23:16:18,774 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-12 23:16:18,774 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-12 23:16:18,783 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 11:16:18" (1/1) ... [2021-11-12 23:16:18,783 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 11:16:18" (1/1) ... [2021-11-12 23:16:18,863 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 11:16:18" (1/1) ... [2021-11-12 23:16:18,864 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 11:16:18" (1/1) ... [2021-11-12 23:16:19,171 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 11:16:18" (1/1) ... [2021-11-12 23:16:19,211 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 11:16:18" (1/1) ... [2021-11-12 23:16:19,235 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 11:16:18" (1/1) ... [2021-11-12 23:16:19,275 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-12 23:16:19,278 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-12 23:16:19,278 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-12 23:16:19,278 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-12 23:16:19,279 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 11:16:18" (1/1) ... [2021-11-12 23:16:19,288 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-12 23:16:19,300 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_90b0c209-26ec-43c3-9ca9-e3e408617533/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 23:16:19,319 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_90b0c209-26ec-43c3-9ca9-e3e408617533/bin/utaipan-vmNK8stdcF/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-12 23:16:19,353 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_90b0c209-26ec-43c3-9ca9-e3e408617533/bin/utaipan-vmNK8stdcF/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-12 23:16:19,370 INFO L130 BoogieDeclarations]: Found specification of procedure __startrek_read_cmd_forward [2021-11-12 23:16:19,370 INFO L138 BoogieDeclarations]: Found implementation of procedure __startrek_read_cmd_forward [2021-11-12 23:16:19,371 INFO L130 BoogieDeclarations]: Found specification of procedure __startrek_cs_t2 [2021-11-12 23:16:19,371 INFO L138 BoogieDeclarations]: Found implementation of procedure __startrek_cs_t2 [2021-11-12 23:16:19,371 INFO L130 BoogieDeclarations]: Found specification of procedure __startrek_write_nxtway_gs_mode [2021-11-12 23:16:19,371 INFO L138 BoogieDeclarations]: Found implementation of procedure __startrek_write_nxtway_gs_mode [2021-11-12 23:16:19,371 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-12 23:16:19,371 INFO L130 BoogieDeclarations]: Found specification of procedure __startrek_cs_t0 [2021-11-12 23:16:19,371 INFO L138 BoogieDeclarations]: Found implementation of procedure __startrek_cs_t0 [2021-11-12 23:16:19,372 INFO L130 BoogieDeclarations]: Found specification of procedure __startrek_cs_t1 [2021-11-12 23:16:19,372 INFO L138 BoogieDeclarations]: Found implementation of procedure __startrek_cs_t1 [2021-11-12 23:16:19,372 INFO L130 BoogieDeclarations]: Found specification of procedure __startrek_read___startrek_current_priority [2021-11-12 23:16:19,372 INFO L138 BoogieDeclarations]: Found implementation of procedure __startrek_read___startrek_current_priority [2021-11-12 23:16:19,372 INFO L130 BoogieDeclarations]: Found specification of procedure __startrek_write_obstacle_flag [2021-11-12 23:16:19,372 INFO L138 BoogieDeclarations]: Found implementation of procedure __startrek_write_obstacle_flag [2021-11-12 23:16:19,372 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-11-12 23:16:19,373 INFO L130 BoogieDeclarations]: Found specification of procedure nxt_motor_set_count [2021-11-12 23:16:19,373 INFO L138 BoogieDeclarations]: Found implementation of procedure nxt_motor_set_count [2021-11-12 23:16:19,373 INFO L130 BoogieDeclarations]: Found specification of procedure __startrek_read_version [2021-11-12 23:16:19,373 INFO L138 BoogieDeclarations]: Found implementation of procedure __startrek_read_version [2021-11-12 23:16:19,373 INFO L130 BoogieDeclarations]: Found specification of procedure ecrobot_get_gyro_sensor [2021-11-12 23:16:19,373 INFO L138 BoogieDeclarations]: Found implementation of procedure ecrobot_get_gyro_sensor [2021-11-12 23:16:19,373 INFO L130 BoogieDeclarations]: Found specification of procedure __startrek_write_cmd_turn [2021-11-12 23:16:19,373 INFO L138 BoogieDeclarations]: Found implementation of procedure __startrek_write_cmd_turn [2021-11-12 23:16:19,374 INFO L130 BoogieDeclarations]: Found specification of procedure __startrek_write___startrek_current_priority [2021-11-12 23:16:19,374 INFO L138 BoogieDeclarations]: Found implementation of procedure __startrek_write___startrek_current_priority [2021-11-12 23:16:19,375 INFO L130 BoogieDeclarations]: Found specification of procedure __startrek_entry_pt_OSEK_Task_ts1 [2021-11-12 23:16:19,375 INFO L138 BoogieDeclarations]: Found implementation of procedure __startrek_entry_pt_OSEK_Task_ts1 [2021-11-12 23:16:19,375 INFO L130 BoogieDeclarations]: Found specification of procedure __startrek_write_version [2021-11-12 23:16:19,375 INFO L138 BoogieDeclarations]: Found implementation of procedure __startrek_write_version [2021-11-12 23:16:19,375 INFO L130 BoogieDeclarations]: Found specification of procedure __startrek_entry_pt_OSEK_Task_ts2 [2021-11-12 23:16:19,376 INFO L138 BoogieDeclarations]: Found implementation of procedure __startrek_entry_pt_OSEK_Task_ts2 [2021-11-12 23:16:19,376 INFO L130 BoogieDeclarations]: Found specification of procedure __startrek_entry_pt_OSEK_Task_ts3 [2021-11-12 23:16:19,376 INFO L138 BoogieDeclarations]: Found implementation of procedure __startrek_entry_pt_OSEK_Task_ts3 [2021-11-12 23:16:19,376 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-11-12 23:16:19,376 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-11-12 23:16:19,376 INFO L130 BoogieDeclarations]: Found specification of procedure assert [2021-11-12 23:16:19,376 INFO L138 BoogieDeclarations]: Found implementation of procedure assert [2021-11-12 23:16:19,377 INFO L130 BoogieDeclarations]: Found specification of procedure nxt_motor_set_speed [2021-11-12 23:16:19,377 INFO L138 BoogieDeclarations]: Found implementation of procedure nxt_motor_set_speed [2021-11-12 23:16:19,377 INFO L130 BoogieDeclarations]: Found specification of procedure __startrek_write_cmd_forward [2021-11-12 23:16:19,377 INFO L138 BoogieDeclarations]: Found implementation of procedure __startrek_write_cmd_forward [2021-11-12 23:16:19,377 INFO L130 BoogieDeclarations]: Found specification of procedure __startrek_read_obstacle_flag [2021-11-12 23:16:19,377 INFO L138 BoogieDeclarations]: Found implementation of procedure __startrek_read_obstacle_flag [2021-11-12 23:16:19,377 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-11-12 23:16:19,378 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-11-12 23:16:19,378 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-12 23:16:19,378 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-12 23:16:19,378 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-12 23:16:19,379 INFO L130 BoogieDeclarations]: Found specification of procedure ecrobot_get_systick_ms [2021-11-12 23:16:19,380 INFO L138 BoogieDeclarations]: Found implementation of procedure ecrobot_get_systick_ms [2021-11-12 23:16:19,380 INFO L130 BoogieDeclarations]: Found specification of procedure nxt_motor_get_count [2021-11-12 23:16:19,380 INFO L138 BoogieDeclarations]: Found implementation of procedure nxt_motor_get_count [2021-11-12 23:16:19,380 INFO L130 BoogieDeclarations]: Found specification of procedure __startrek_read_nxtway_gs_mode [2021-11-12 23:16:19,381 INFO L138 BoogieDeclarations]: Found implementation of procedure __startrek_read_nxtway_gs_mode [2021-11-12 23:16:19,381 INFO L130 BoogieDeclarations]: Found specification of procedure __startrek_read_cmd_turn [2021-11-12 23:16:19,381 INFO L138 BoogieDeclarations]: Found implementation of procedure __startrek_read_cmd_turn [2021-11-12 23:16:38,471 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-12 23:16:38,471 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2021-11-12 23:16:38,479 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 12.11 11:16:38 BoogieIcfgContainer [2021-11-12 23:16:38,479 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-12 23:16:38,482 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-12 23:16:38,483 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-12 23:16:38,486 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-12 23:16:38,486 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 12.11 11:16:16" (1/3) ... [2021-11-12 23:16:38,487 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7a911d2d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 12.11 11:16:38, skipping insertion in model container [2021-11-12 23:16:38,487 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 11:16:18" (2/3) ... [2021-11-12 23:16:38,488 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7a911d2d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 12.11 11:16:38, skipping insertion in model container [2021-11-12 23:16:38,489 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 12.11 11:16:38" (3/3) ... [2021-11-12 23:16:38,492 INFO L111 eAbstractionObserver]: Analyzing ICFG rekh_aso.3.M1.c [2021-11-12 23:16:38,498 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-12 23:16:38,499 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-12 23:16:38,578 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-12 23:16:38,588 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 [2021-11-12 23:16:38,589 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-12 23:16:38,697 INFO L276 IsEmpty]: Start isEmpty. Operand has 3531 states, 1995 states have (on average 1.1654135338345866) internal successors, (2325), 2000 states have internal predecessors, (2325), 1509 states have call successors, (1509), 25 states have call predecessors, (1509), 25 states have return successors, (1509), 1507 states have call predecessors, (1509), 1509 states have call successors, (1509) [2021-11-12 23:16:38,768 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 952 [2021-11-12 23:16:38,769 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:16:38,770 INFO L514 BasicCegarLoop]: trace histogram [210, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 23:16:38,771 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:16:38,776 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:16:38,778 INFO L85 PathProgramCache]: Analyzing trace with hash 245865012, now seen corresponding path program 1 times [2021-11-12 23:16:38,787 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 23:16:38,787 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [860213368] [2021-11-12 23:16:38,788 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:16:38,789 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 23:16:39,704 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:16:40,613 INFO L134 CoverageAnalysis]: Checked inductivity of 43890 backedges. 208 proven. 1 refuted. 0 times theorem prover too weak. 43681 trivial. 0 not checked. [2021-11-12 23:16:40,634 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 23:16:40,634 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [860213368] [2021-11-12 23:16:40,635 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [860213368] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-12 23:16:40,636 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1658246178] [2021-11-12 23:16:40,636 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:16:40,636 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 23:16:40,637 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_90b0c209-26ec-43c3-9ca9-e3e408617533/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 23:16:40,666 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_90b0c209-26ec-43c3-9ca9-e3e408617533/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 23:16:40,782 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_90b0c209-26ec-43c3-9ca9-e3e408617533/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-12 23:16:42,262 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:16:42,286 INFO L263 TraceCheckSpWp]: Trace formula consists of 3291 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-12 23:16:42,347 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:16:44,245 INFO L134 CoverageAnalysis]: Checked inductivity of 43890 backedges. 626 proven. 0 refuted. 0 times theorem prover too weak. 43264 trivial. 0 not checked. [2021-11-12 23:16:44,245 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:16:46,206 INFO L134 CoverageAnalysis]: Checked inductivity of 43890 backedges. 208 proven. 1 refuted. 0 times theorem prover too weak. 43681 trivial. 0 not checked. [2021-11-12 23:16:46,207 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1658246178] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-12 23:16:46,207 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-12 23:16:46,209 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [3, 3] total 3 [2021-11-12 23:16:46,211 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [253732737] [2021-11-12 23:16:46,212 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-12 23:16:46,219 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-12 23:16:46,220 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 23:16:46,246 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-12 23:16:46,246 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-12 23:16:46,258 INFO L87 Difference]: Start difference. First operand has 3531 states, 1995 states have (on average 1.1654135338345866) internal successors, (2325), 2000 states have internal predecessors, (2325), 1509 states have call successors, (1509), 25 states have call predecessors, (1509), 25 states have return successors, (1509), 1507 states have call predecessors, (1509), 1509 states have call successors, (1509) Second operand has 3 states, 2 states have (on average 159.5) internal successors, (319), 3 states have internal predecessors, (319), 2 states have call successors, (213), 2 states have call predecessors, (213), 3 states have return successors, (212), 2 states have call predecessors, (212), 2 states have call successors, (212) [2021-11-12 23:16:48,292 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-12 23:16:53,125 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.17s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-12 23:17:03,784 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:17:03,785 INFO L93 Difference]: Finished difference Result 6353 states and 9657 transitions. [2021-11-12 23:17:03,796 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-12 23:17:03,798 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 159.5) internal successors, (319), 3 states have internal predecessors, (319), 2 states have call successors, (213), 2 states have call predecessors, (213), 3 states have return successors, (212), 2 states have call predecessors, (212), 2 states have call successors, (212) Word has length 951 [2021-11-12 23:17:03,805 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:17:03,881 INFO L225 Difference]: With dead ends: 6353 [2021-11-12 23:17:03,882 INFO L226 Difference]: Without dead ends: 3526 [2021-11-12 23:17:03,915 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1903 GetRequests, 1902 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-12 23:17:03,922 INFO L933 BasicCegarLoop]: 3934 mSDtfsCounter, 0 mSDsluCounter, 2603 mSDsCounter, 0 mSdLazyCounter, 4168 mSolverCounterSat, 4 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 15007.63ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 6501 SdHoareTripleChecker+Invalid, 4174 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 88.56ms SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 4168 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 17000.14ms IncrementalHoareTripleChecker+Time [2021-11-12 23:17:03,929 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 6501 Invalid, 4174 Unknown, 0 Unchecked, 88.56ms Time], IncrementalHoareTripleChecker [4 Valid, 4168 Invalid, 2 Unknown, 0 Unchecked, 17000.14ms Time] [2021-11-12 23:17:03,955 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3526 states. [2021-11-12 23:17:05,217 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3526 to 3525. [2021-11-12 23:17:05,228 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3525 states, 1992 states have (on average 1.1641566265060241) internal successors, (2319), 1997 states have internal predecessors, (2319), 1507 states have call successors, (1507), 25 states have call predecessors, (1507), 25 states have return successors, (1506), 1504 states have call predecessors, (1506), 1506 states have call successors, (1506) [2021-11-12 23:17:05,261 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3525 states to 3525 states and 5332 transitions. [2021-11-12 23:17:05,264 INFO L78 Accepts]: Start accepts. Automaton has 3525 states and 5332 transitions. Word has length 951 [2021-11-12 23:17:05,269 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:17:05,270 INFO L470 AbstractCegarLoop]: Abstraction has 3525 states and 5332 transitions. [2021-11-12 23:17:05,271 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 159.5) internal successors, (319), 3 states have internal predecessors, (319), 2 states have call successors, (213), 2 states have call predecessors, (213), 3 states have return successors, (212), 2 states have call predecessors, (212), 2 states have call successors, (212) [2021-11-12 23:17:05,271 INFO L276 IsEmpty]: Start isEmpty. Operand 3525 states and 5332 transitions. [2021-11-12 23:17:05,314 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 985 [2021-11-12 23:17:05,315 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:17:05,316 INFO L514 BasicCegarLoop]: trace histogram [209, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 23:17:05,362 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_90b0c209-26ec-43c3-9ca9-e3e408617533/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-12 23:17:05,529 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_90b0c209-26ec-43c3-9ca9-e3e408617533/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable0 [2021-11-12 23:17:05,530 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:17:05,531 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:17:05,531 INFO L85 PathProgramCache]: Analyzing trace with hash 1813264086, now seen corresponding path program 1 times [2021-11-12 23:17:05,532 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 23:17:05,532 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1600864971] [2021-11-12 23:17:05,532 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:17:05,532 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 23:17:05,877 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:17:06,804 INFO L134 CoverageAnalysis]: Checked inductivity of 43478 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 43478 trivial. 0 not checked. [2021-11-12 23:17:06,805 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 23:17:06,805 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1600864971] [2021-11-12 23:17:06,805 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1600864971] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-12 23:17:06,806 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-12 23:17:06,806 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-12 23:17:06,806 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [206685139] [2021-11-12 23:17:06,807 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-12 23:17:06,810 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-12 23:17:06,811 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 23:17:06,811 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-12 23:17:06,811 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-12 23:17:06,812 INFO L87 Difference]: Start difference. First operand 3525 states and 5332 transitions. Second operand has 3 states, 3 states have (on average 114.0) internal successors, (342), 3 states have internal predecessors, (342), 2 states have call successors, (215), 2 states have call predecessors, (215), 2 states have return successors, (214), 2 states have call predecessors, (214), 2 states have call successors, (214) [2021-11-12 23:17:08,832 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-12 23:17:10,940 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.04s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-12 23:17:12,000 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:17:12,001 INFO L93 Difference]: Finished difference Result 6342 states and 9607 transitions. [2021-11-12 23:17:12,001 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-12 23:17:12,002 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 114.0) internal successors, (342), 3 states have internal predecessors, (342), 2 states have call successors, (215), 2 states have call predecessors, (215), 2 states have return successors, (214), 2 states have call predecessors, (214), 2 states have call successors, (214) Word has length 984 [2021-11-12 23:17:12,008 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:17:12,046 INFO L225 Difference]: With dead ends: 6342 [2021-11-12 23:17:12,046 INFO L226 Difference]: Without dead ends: 3525 [2021-11-12 23:17:12,060 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-12 23:17:12,064 INFO L933 BasicCegarLoop]: 5292 mSDtfsCounter, 20 mSDsluCounter, 5280 mSDsCounter, 0 mSdLazyCounter, 72 mSolverCounterSat, 3 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4329.06ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 40 SdHoareTripleChecker+Valid, 10542 SdHoareTripleChecker+Invalid, 77 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 24.98ms SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 72 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4864.52ms IncrementalHoareTripleChecker+Time [2021-11-12 23:17:12,067 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [40 Valid, 10542 Invalid, 77 Unknown, 0 Unchecked, 24.98ms Time], IncrementalHoareTripleChecker [3 Valid, 72 Invalid, 2 Unknown, 0 Unchecked, 4864.52ms Time] [2021-11-12 23:17:12,077 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3525 states. [2021-11-12 23:17:13,386 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3525 to 3525. [2021-11-12 23:17:13,406 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3525 states, 1992 states have (on average 1.1636546184738956) internal successors, (2318), 1997 states have internal predecessors, (2318), 1507 states have call successors, (1507), 25 states have call predecessors, (1507), 25 states have return successors, (1506), 1504 states have call predecessors, (1506), 1506 states have call successors, (1506) [2021-11-12 23:17:13,433 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3525 states to 3525 states and 5331 transitions. [2021-11-12 23:17:13,435 INFO L78 Accepts]: Start accepts. Automaton has 3525 states and 5331 transitions. Word has length 984 [2021-11-12 23:17:13,438 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:17:13,439 INFO L470 AbstractCegarLoop]: Abstraction has 3525 states and 5331 transitions. [2021-11-12 23:17:13,440 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 114.0) internal successors, (342), 3 states have internal predecessors, (342), 2 states have call successors, (215), 2 states have call predecessors, (215), 2 states have return successors, (214), 2 states have call predecessors, (214), 2 states have call successors, (214) [2021-11-12 23:17:13,440 INFO L276 IsEmpty]: Start isEmpty. Operand 3525 states and 5331 transitions. [2021-11-12 23:17:13,489 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 991 [2021-11-12 23:17:13,490 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:17:13,491 INFO L514 BasicCegarLoop]: trace histogram [209, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 23:17:13,491 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-12 23:17:13,492 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:17:13,492 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:17:13,493 INFO L85 PathProgramCache]: Analyzing trace with hash -1229241450, now seen corresponding path program 1 times [2021-11-12 23:17:13,493 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 23:17:13,495 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [214679556] [2021-11-12 23:17:13,495 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:17:13,495 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 23:17:14,049 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:17:14,765 INFO L134 CoverageAnalysis]: Checked inductivity of 43480 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 43480 trivial. 0 not checked. [2021-11-12 23:17:14,765 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 23:17:14,766 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [214679556] [2021-11-12 23:17:14,766 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [214679556] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-12 23:17:14,766 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-12 23:17:14,766 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-12 23:17:14,767 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1507940841] [2021-11-12 23:17:14,767 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-12 23:17:14,769 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-12 23:17:14,769 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 23:17:14,770 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-12 23:17:14,770 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-12 23:17:14,770 INFO L87 Difference]: Start difference. First operand 3525 states and 5331 transitions. Second operand has 5 states, 4 states have (on average 85.75) internal successors, (343), 5 states have internal predecessors, (343), 4 states have call successors, (217), 2 states have call predecessors, (217), 2 states have return successors, (216), 3 states have call predecessors, (216), 4 states have call successors, (216) [2021-11-12 23:17:16,795 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-12 23:17:18,984 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.11s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-12 23:17:36,887 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:17:36,887 INFO L93 Difference]: Finished difference Result 6652 states and 10059 transitions. [2021-11-12 23:17:36,888 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-12 23:17:36,888 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 85.75) internal successors, (343), 5 states have internal predecessors, (343), 4 states have call successors, (217), 2 states have call predecessors, (217), 2 states have return successors, (216), 3 states have call predecessors, (216), 4 states have call successors, (216) Word has length 990 [2021-11-12 23:17:36,890 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:17:36,931 INFO L225 Difference]: With dead ends: 6652 [2021-11-12 23:17:36,931 INFO L226 Difference]: Without dead ends: 3835 [2021-11-12 23:17:36,951 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-11-12 23:17:36,952 INFO L933 BasicCegarLoop]: 5665 mSDtfsCounter, 4678 mSDsluCounter, 6377 mSDsCounter, 0 mSdLazyCounter, 4411 mSolverCounterSat, 35 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 19543.81ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 4678 SdHoareTripleChecker+Valid, 11979 SdHoareTripleChecker+Invalid, 4448 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 72.12ms SdHoareTripleChecker+Time, 35 IncrementalHoareTripleChecker+Valid, 4411 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 21639.05ms IncrementalHoareTripleChecker+Time [2021-11-12 23:17:36,953 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [4678 Valid, 11979 Invalid, 4448 Unknown, 0 Unchecked, 72.12ms Time], IncrementalHoareTripleChecker [35 Valid, 4411 Invalid, 2 Unknown, 0 Unchecked, 21639.05ms Time] [2021-11-12 23:17:36,961 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3835 states. [2021-11-12 23:17:37,718 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3835 to 3835. [2021-11-12 23:17:37,725 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3835 states, 2215 states have (on average 1.182844243792325) internal successors, (2620), 2220 states have internal predecessors, (2620), 1582 states have call successors, (1582), 37 states have call predecessors, (1582), 37 states have return successors, (1581), 1579 states have call predecessors, (1581), 1581 states have call successors, (1581) [2021-11-12 23:17:37,746 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3835 states to 3835 states and 5783 transitions. [2021-11-12 23:17:37,747 INFO L78 Accepts]: Start accepts. Automaton has 3835 states and 5783 transitions. Word has length 990 [2021-11-12 23:17:37,749 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:17:37,750 INFO L470 AbstractCegarLoop]: Abstraction has 3835 states and 5783 transitions. [2021-11-12 23:17:37,750 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 85.75) internal successors, (343), 5 states have internal predecessors, (343), 4 states have call successors, (217), 2 states have call predecessors, (217), 2 states have return successors, (216), 3 states have call predecessors, (216), 4 states have call successors, (216) [2021-11-12 23:17:37,750 INFO L276 IsEmpty]: Start isEmpty. Operand 3835 states and 5783 transitions. [2021-11-12 23:17:37,767 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 995 [2021-11-12 23:17:37,767 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:17:37,768 INFO L514 BasicCegarLoop]: trace histogram [209, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 23:17:37,768 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-12 23:17:37,768 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:17:37,769 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:17:37,769 INFO L85 PathProgramCache]: Analyzing trace with hash 2069851431, now seen corresponding path program 1 times [2021-11-12 23:17:37,770 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 23:17:37,770 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1425203151] [2021-11-12 23:17:37,770 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:17:37,770 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 23:17:38,059 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:17:38,605 INFO L134 CoverageAnalysis]: Checked inductivity of 43480 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 43477 trivial. 0 not checked. [2021-11-12 23:17:38,605 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 23:17:38,605 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1425203151] [2021-11-12 23:17:38,606 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1425203151] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-12 23:17:38,606 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [875770071] [2021-11-12 23:17:38,606 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:17:38,606 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 23:17:38,606 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_90b0c209-26ec-43c3-9ca9-e3e408617533/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 23:17:38,622 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_90b0c209-26ec-43c3-9ca9-e3e408617533/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 23:17:38,631 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_90b0c209-26ec-43c3-9ca9-e3e408617533/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-12 23:17:39,765 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:17:39,783 INFO L263 TraceCheckSpWp]: Trace formula consists of 3441 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-12 23:17:39,809 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:17:41,893 INFO L134 CoverageAnalysis]: Checked inductivity of 43480 backedges. 420 proven. 0 refuted. 0 times theorem prover too weak. 43060 trivial. 0 not checked. [2021-11-12 23:17:41,893 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:17:44,586 INFO L134 CoverageAnalysis]: Checked inductivity of 43480 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 43477 trivial. 0 not checked. [2021-11-12 23:17:44,588 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [875770071] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-12 23:17:44,588 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-12 23:17:44,589 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [6, 6] total 8 [2021-11-12 23:17:44,590 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2099191608] [2021-11-12 23:17:44,590 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-12 23:17:44,591 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-12 23:17:44,592 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 23:17:44,592 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-12 23:17:44,592 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2021-11-12 23:17:44,593 INFO L87 Difference]: Start difference. First operand 3835 states and 5783 transitions. Second operand has 5 states, 5 states have (on average 70.0) internal successors, (350), 5 states have internal predecessors, (350), 3 states have call successors, (218), 3 states have call predecessors, (218), 3 states have return successors, (217), 3 states have call predecessors, (217), 3 states have call successors, (217) [2021-11-12 23:17:46,615 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-12 23:17:48,783 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.07s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-12 23:18:06,787 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:18:06,787 INFO L93 Difference]: Finished difference Result 8243 states and 12422 transitions. [2021-11-12 23:18:06,788 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-12 23:18:06,789 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 70.0) internal successors, (350), 5 states have internal predecessors, (350), 3 states have call successors, (218), 3 states have call predecessors, (218), 3 states have return successors, (217), 3 states have call predecessors, (217), 3 states have call successors, (217) Word has length 994 [2021-11-12 23:18:06,792 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:18:06,837 INFO L225 Difference]: With dead ends: 8243 [2021-11-12 23:18:06,838 INFO L226 Difference]: Without dead ends: 5118 [2021-11-12 23:18:06,855 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1993 GetRequests, 1984 SyntacticMatches, 2 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=24, Invalid=48, Unknown=0, NotChecked=0, Total=72 [2021-11-12 23:18:06,856 INFO L933 BasicCegarLoop]: 6465 mSDtfsCounter, 3492 mSDsluCounter, 9175 mSDsCounter, 0 mSdLazyCounter, 4468 mSolverCounterSat, 36 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 19659.41ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 3495 SdHoareTripleChecker+Valid, 15527 SdHoareTripleChecker+Invalid, 4506 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 53.39ms SdHoareTripleChecker+Time, 36 IncrementalHoareTripleChecker+Valid, 4468 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 21712.09ms IncrementalHoareTripleChecker+Time [2021-11-12 23:18:06,856 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3495 Valid, 15527 Invalid, 4506 Unknown, 0 Unchecked, 53.39ms Time], IncrementalHoareTripleChecker [36 Valid, 4468 Invalid, 2 Unknown, 0 Unchecked, 21712.09ms Time] [2021-11-12 23:18:06,866 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5118 states. [2021-11-12 23:18:07,863 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5118 to 5084. [2021-11-12 23:18:07,871 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5084 states, 2991 states have (on average 1.205616850551655) internal successors, (3606), 3026 states have internal predecessors, (3606), 2023 states have call successors, (2023), 67 states have call predecessors, (2023), 69 states have return successors, (2027), 1994 states have call predecessors, (2027), 2022 states have call successors, (2027) [2021-11-12 23:18:07,898 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5084 states to 5084 states and 7656 transitions. [2021-11-12 23:18:07,899 INFO L78 Accepts]: Start accepts. Automaton has 5084 states and 7656 transitions. Word has length 994 [2021-11-12 23:18:07,901 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:18:07,902 INFO L470 AbstractCegarLoop]: Abstraction has 5084 states and 7656 transitions. [2021-11-12 23:18:07,902 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 70.0) internal successors, (350), 5 states have internal predecessors, (350), 3 states have call successors, (218), 3 states have call predecessors, (218), 3 states have return successors, (217), 3 states have call predecessors, (217), 3 states have call successors, (217) [2021-11-12 23:18:07,902 INFO L276 IsEmpty]: Start isEmpty. Operand 5084 states and 7656 transitions. [2021-11-12 23:18:07,925 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 995 [2021-11-12 23:18:07,926 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:18:07,926 INFO L514 BasicCegarLoop]: trace histogram [209, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 23:18:07,966 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_90b0c209-26ec-43c3-9ca9-e3e408617533/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-12 23:18:08,146 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_90b0c209-26ec-43c3-9ca9-e3e408617533/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 23:18:08,146 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:18:08,146 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:18:08,147 INFO L85 PathProgramCache]: Analyzing trace with hash -582489817, now seen corresponding path program 1 times [2021-11-12 23:18:08,147 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 23:18:08,147 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [976091792] [2021-11-12 23:18:08,147 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:18:08,148 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 23:18:08,410 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:18:08,931 INFO L134 CoverageAnalysis]: Checked inductivity of 43480 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 43475 trivial. 0 not checked. [2021-11-12 23:18:08,932 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 23:18:08,932 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [976091792] [2021-11-12 23:18:08,932 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [976091792] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-12 23:18:08,932 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [303925516] [2021-11-12 23:18:08,933 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:18:08,933 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 23:18:08,933 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_90b0c209-26ec-43c3-9ca9-e3e408617533/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 23:18:08,934 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_90b0c209-26ec-43c3-9ca9-e3e408617533/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 23:18:08,955 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_90b0c209-26ec-43c3-9ca9-e3e408617533/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-12 23:18:10,016 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:18:10,032 INFO L263 TraceCheckSpWp]: Trace formula consists of 3442 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-12 23:18:10,055 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:18:11,909 INFO L134 CoverageAnalysis]: Checked inductivity of 43480 backedges. 418 proven. 0 refuted. 0 times theorem prover too weak. 43062 trivial. 0 not checked. [2021-11-12 23:18:11,909 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:18:14,315 INFO L134 CoverageAnalysis]: Checked inductivity of 43480 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 43475 trivial. 0 not checked. [2021-11-12 23:18:14,315 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [303925516] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-12 23:18:14,315 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-12 23:18:14,316 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [6, 6] total 8 [2021-11-12 23:18:14,317 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1345550593] [2021-11-12 23:18:14,317 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-12 23:18:14,318 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-12 23:18:14,318 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 23:18:14,319 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-12 23:18:14,319 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2021-11-12 23:18:14,320 INFO L87 Difference]: Start difference. First operand 5084 states and 7656 transitions. Second operand has 5 states, 5 states have (on average 69.6) internal successors, (348), 5 states have internal predecessors, (348), 3 states have call successors, (218), 3 states have call predecessors, (218), 3 states have return successors, (217), 3 states have call predecessors, (217), 3 states have call successors, (217) [2021-11-12 23:18:16,336 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-12 23:18:18,458 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.04s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-12 23:18:41,201 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:18:41,201 INFO L93 Difference]: Finished difference Result 12334 states and 18571 transitions. [2021-11-12 23:18:41,202 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-12 23:18:41,202 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 69.6) internal successors, (348), 5 states have internal predecessors, (348), 3 states have call successors, (218), 3 states have call predecessors, (218), 3 states have return successors, (217), 3 states have call predecessors, (217), 3 states have call successors, (217) Word has length 994 [2021-11-12 23:18:41,205 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:18:41,276 INFO L225 Difference]: With dead ends: 12334 [2021-11-12 23:18:41,276 INFO L226 Difference]: Without dead ends: 8030 [2021-11-12 23:18:41,298 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1993 GetRequests, 1984 SyntacticMatches, 2 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=24, Invalid=48, Unknown=0, NotChecked=0, Total=72 [2021-11-12 23:18:41,299 INFO L933 BasicCegarLoop]: 7878 mSDtfsCounter, 4164 mSDsluCounter, 11710 mSDsCounter, 0 mSdLazyCounter, 5288 mSolverCounterSat, 3 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 22961.37ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 4165 SdHoareTripleChecker+Valid, 19475 SdHoareTripleChecker+Invalid, 5293 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 55.87ms SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 5288 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 26349.01ms IncrementalHoareTripleChecker+Time [2021-11-12 23:18:41,299 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [4165 Valid, 19475 Invalid, 5293 Unknown, 0 Unchecked, 55.87ms Time], IncrementalHoareTripleChecker [3 Valid, 5288 Invalid, 2 Unknown, 0 Unchecked, 26349.01ms Time] [2021-11-12 23:18:41,312 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8030 states. [2021-11-12 23:18:43,262 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8030 to 7967. [2021-11-12 23:18:43,273 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 7967 states, 4696 states have (on average 1.2076235093696763) internal successors, (5671), 4768 states have internal predecessors, (5671), 3151 states have call successors, (3151), 111 states have call predecessors, (3151), 119 states have return successors, (3183), 3094 states have call predecessors, (3183), 3149 states have call successors, (3183) [2021-11-12 23:18:43,315 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7967 states to 7967 states and 12005 transitions. [2021-11-12 23:18:43,317 INFO L78 Accepts]: Start accepts. Automaton has 7967 states and 12005 transitions. Word has length 994 [2021-11-12 23:18:43,318 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:18:43,319 INFO L470 AbstractCegarLoop]: Abstraction has 7967 states and 12005 transitions. [2021-11-12 23:18:43,319 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 69.6) internal successors, (348), 5 states have internal predecessors, (348), 3 states have call successors, (218), 3 states have call predecessors, (218), 3 states have return successors, (217), 3 states have call predecessors, (217), 3 states have call successors, (217) [2021-11-12 23:18:43,319 INFO L276 IsEmpty]: Start isEmpty. Operand 7967 states and 12005 transitions. [2021-11-12 23:18:43,344 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 996 [2021-11-12 23:18:43,344 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:18:43,345 INFO L514 BasicCegarLoop]: trace histogram [209, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 23:18:43,387 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_90b0c209-26ec-43c3-9ca9-e3e408617533/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-12 23:18:43,557 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_90b0c209-26ec-43c3-9ca9-e3e408617533/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 23:18:43,558 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:18:43,558 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:18:43,559 INFO L85 PathProgramCache]: Analyzing trace with hash 488491510, now seen corresponding path program 1 times [2021-11-12 23:18:43,559 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 23:18:43,559 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2109405017] [2021-11-12 23:18:43,559 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:18:43,559 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 23:18:43,808 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:18:44,423 INFO L134 CoverageAnalysis]: Checked inductivity of 43480 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 43476 trivial. 0 not checked. [2021-11-12 23:18:44,423 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 23:18:44,423 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2109405017] [2021-11-12 23:18:44,423 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2109405017] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-12 23:18:44,423 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [729532573] [2021-11-12 23:18:44,424 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:18:44,424 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 23:18:44,424 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_90b0c209-26ec-43c3-9ca9-e3e408617533/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 23:18:44,427 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_90b0c209-26ec-43c3-9ca9-e3e408617533/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 23:18:44,446 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_90b0c209-26ec-43c3-9ca9-e3e408617533/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-12 23:18:45,540 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:18:45,557 INFO L263 TraceCheckSpWp]: Trace formula consists of 3444 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-12 23:18:45,578 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:18:47,343 INFO L134 CoverageAnalysis]: Checked inductivity of 43480 backedges. 419 proven. 0 refuted. 0 times theorem prover too weak. 43061 trivial. 0 not checked. [2021-11-12 23:18:47,344 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:18:50,013 INFO L134 CoverageAnalysis]: Checked inductivity of 43480 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 43476 trivial. 0 not checked. [2021-11-12 23:18:50,013 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [729532573] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-12 23:18:50,013 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-12 23:18:50,014 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [6, 6] total 8 [2021-11-12 23:18:50,015 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1271776201] [2021-11-12 23:18:50,015 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-12 23:18:50,016 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-12 23:18:50,016 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 23:18:50,017 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-12 23:18:50,017 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2021-11-12 23:18:50,017 INFO L87 Difference]: Start difference. First operand 7967 states and 12005 transitions. Second operand has 5 states, 5 states have (on average 70.0) internal successors, (350), 5 states have internal predecessors, (350), 3 states have call successors, (218), 3 states have call predecessors, (218), 3 states have return successors, (217), 3 states have call predecessors, (217), 3 states have call successors, (217) [2021-11-12 23:18:52,074 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.06s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-12 23:18:54,177 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.04s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-12 23:19:16,173 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:19:16,173 INFO L93 Difference]: Finished difference Result 15905 states and 23982 transitions. [2021-11-12 23:19:16,175 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-12 23:19:16,175 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 70.0) internal successors, (350), 5 states have internal predecessors, (350), 3 states have call successors, (218), 3 states have call predecessors, (218), 3 states have return successors, (217), 3 states have call predecessors, (217), 3 states have call successors, (217) Word has length 995 [2021-11-12 23:19:16,177 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:19:16,234 INFO L225 Difference]: With dead ends: 15905 [2021-11-12 23:19:16,234 INFO L226 Difference]: Without dead ends: 9155 [2021-11-12 23:19:16,262 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1995 GetRequests, 1986 SyntacticMatches, 2 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=24, Invalid=48, Unknown=0, NotChecked=0, Total=72 [2021-11-12 23:19:16,263 INFO L933 BasicCegarLoop]: 7151 mSDtfsCounter, 3453 mSDsluCounter, 14790 mSDsCounter, 0 mSdLazyCounter, 4478 mSolverCounterSat, 11 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 21445.14ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 3455 SdHoareTripleChecker+Valid, 21818 SdHoareTripleChecker+Invalid, 4491 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 51.75ms SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 4478 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 25610.90ms IncrementalHoareTripleChecker+Time [2021-11-12 23:19:16,264 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3455 Valid, 21818 Invalid, 4491 Unknown, 0 Unchecked, 51.75ms Time], IncrementalHoareTripleChecker [11 Valid, 4478 Invalid, 2 Unknown, 0 Unchecked, 25610.90ms Time] [2021-11-12 23:19:16,279 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9155 states. [2021-11-12 23:19:18,797 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9155 to 9000. [2021-11-12 23:19:18,810 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9000 states, 5287 states have (on average 1.2054094949877057) internal successors, (6373), 5381 states have internal predecessors, (6373), 3579 states have call successors, (3579), 125 states have call predecessors, (3579), 133 states have return successors, (3632), 3500 states have call predecessors, (3632), 3577 states have call successors, (3632) [2021-11-12 23:19:18,855 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9000 states to 9000 states and 13584 transitions. [2021-11-12 23:19:18,857 INFO L78 Accepts]: Start accepts. Automaton has 9000 states and 13584 transitions. Word has length 995 [2021-11-12 23:19:18,859 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:19:18,859 INFO L470 AbstractCegarLoop]: Abstraction has 9000 states and 13584 transitions. [2021-11-12 23:19:18,859 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 70.0) internal successors, (350), 5 states have internal predecessors, (350), 3 states have call successors, (218), 3 states have call predecessors, (218), 3 states have return successors, (217), 3 states have call predecessors, (217), 3 states have call successors, (217) [2021-11-12 23:19:18,860 INFO L276 IsEmpty]: Start isEmpty. Operand 9000 states and 13584 transitions. [2021-11-12 23:19:18,885 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1003 [2021-11-12 23:19:18,886 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:19:18,886 INFO L514 BasicCegarLoop]: trace histogram [209, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 23:19:18,933 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_90b0c209-26ec-43c3-9ca9-e3e408617533/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-12 23:19:19,101 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_90b0c209-26ec-43c3-9ca9-e3e408617533/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2021-11-12 23:19:19,102 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:19:19,102 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:19:19,103 INFO L85 PathProgramCache]: Analyzing trace with hash 248433671, now seen corresponding path program 1 times [2021-11-12 23:19:19,103 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 23:19:19,103 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1650313870] [2021-11-12 23:19:19,103 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:19:19,103 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 23:19:19,467 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:19:20,007 INFO L134 CoverageAnalysis]: Checked inductivity of 43480 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 43480 trivial. 0 not checked. [2021-11-12 23:19:20,007 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 23:19:20,007 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1650313870] [2021-11-12 23:19:20,007 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1650313870] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-12 23:19:20,007 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-12 23:19:20,008 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-12 23:19:20,008 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1059082269] [2021-11-12 23:19:20,008 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-12 23:19:20,009 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-12 23:19:20,009 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 23:19:20,009 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-12 23:19:20,010 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-12 23:19:20,010 INFO L87 Difference]: Start difference. First operand 9000 states and 13584 transitions. Second operand has 6 states, 6 states have (on average 58.5) internal successors, (351), 6 states have internal predecessors, (351), 3 states have call successors, (220), 2 states have call predecessors, (220), 4 states have return successors, (219), 3 states have call predecessors, (219), 3 states have call successors, (219) [2021-11-12 23:19:22,025 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-12 23:19:24,159 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.05s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-12 23:19:45,230 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:19:45,230 INFO L93 Difference]: Finished difference Result 17254 states and 26102 transitions. [2021-11-12 23:19:45,231 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-12 23:19:45,232 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 58.5) internal successors, (351), 6 states have internal predecessors, (351), 3 states have call successors, (220), 2 states have call predecessors, (220), 4 states have return successors, (219), 3 states have call predecessors, (219), 3 states have call successors, (219) Word has length 1002 [2021-11-12 23:19:45,233 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:19:45,280 INFO L225 Difference]: With dead ends: 17254 [2021-11-12 23:19:45,280 INFO L226 Difference]: Without dead ends: 9859 [2021-11-12 23:19:45,306 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=16, Invalid=26, Unknown=0, NotChecked=0, Total=42 [2021-11-12 23:19:45,307 INFO L933 BasicCegarLoop]: 6305 mSDtfsCounter, 7052 mSDsluCounter, 5335 mSDsCounter, 0 mSdLazyCounter, 3067 mSolverCounterSat, 2758 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 19888.18ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 7055 SdHoareTripleChecker+Valid, 11568 SdHoareTripleChecker+Invalid, 5827 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 47.30ms SdHoareTripleChecker+Time, 2758 IncrementalHoareTripleChecker+Valid, 3067 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 24557.39ms IncrementalHoareTripleChecker+Time [2021-11-12 23:19:45,308 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [7055 Valid, 11568 Invalid, 5827 Unknown, 0 Unchecked, 47.30ms Time], IncrementalHoareTripleChecker [2758 Valid, 3067 Invalid, 2 Unknown, 0 Unchecked, 24557.39ms Time] [2021-11-12 23:19:45,320 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9859 states. [2021-11-12 23:19:47,835 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9859 to 9843. [2021-11-12 23:19:47,846 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9843 states, 5851 states have (on average 1.2153478037942231) internal successors, (7111), 5957 states have internal predecessors, (7111), 3824 states have call successors, (3824), 155 states have call predecessors, (3824), 167 states have return successors, (3881), 3739 states have call predecessors, (3881), 3822 states have call successors, (3881) [2021-11-12 23:19:47,894 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9843 states to 9843 states and 14816 transitions. [2021-11-12 23:19:47,899 INFO L78 Accepts]: Start accepts. Automaton has 9843 states and 14816 transitions. Word has length 1002 [2021-11-12 23:19:47,900 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:19:47,900 INFO L470 AbstractCegarLoop]: Abstraction has 9843 states and 14816 transitions. [2021-11-12 23:19:47,901 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 58.5) internal successors, (351), 6 states have internal predecessors, (351), 3 states have call successors, (220), 2 states have call predecessors, (220), 4 states have return successors, (219), 3 states have call predecessors, (219), 3 states have call successors, (219) [2021-11-12 23:19:47,901 INFO L276 IsEmpty]: Start isEmpty. Operand 9843 states and 14816 transitions. [2021-11-12 23:19:47,933 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1007 [2021-11-12 23:19:47,933 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:19:47,934 INFO L514 BasicCegarLoop]: trace histogram [209, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 23:19:47,935 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-11-12 23:19:47,935 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:19:47,935 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:19:47,936 INFO L85 PathProgramCache]: Analyzing trace with hash 477077515, now seen corresponding path program 1 times [2021-11-12 23:19:47,936 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 23:19:47,936 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1636015210] [2021-11-12 23:19:47,936 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:19:47,937 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 23:19:48,160 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:19:48,749 INFO L134 CoverageAnalysis]: Checked inductivity of 43484 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 43484 trivial. 0 not checked. [2021-11-12 23:19:48,749 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 23:19:48,749 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1636015210] [2021-11-12 23:19:48,750 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1636015210] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-12 23:19:48,750 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-12 23:19:48,750 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-12 23:19:48,750 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1405577903] [2021-11-12 23:19:48,750 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-12 23:19:48,753 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-12 23:19:48,754 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 23:19:48,754 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-12 23:19:48,754 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-12 23:19:48,755 INFO L87 Difference]: Start difference. First operand 9843 states and 14816 transitions. Second operand has 6 states, 6 states have (on average 58.333333333333336) internal successors, (350), 6 states have internal predecessors, (350), 4 states have call successors, (221), 2 states have call predecessors, (221), 4 states have return successors, (220), 4 states have call predecessors, (220), 4 states have call successors, (220) [2021-11-12 23:19:50,784 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.03s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-12 23:19:52,920 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.05s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-12 23:20:26,837 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:20:26,837 INFO L93 Difference]: Finished difference Result 18106 states and 27343 transitions. [2021-11-12 23:20:26,839 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-12 23:20:26,840 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 58.333333333333336) internal successors, (350), 6 states have internal predecessors, (350), 4 states have call successors, (221), 2 states have call predecessors, (221), 4 states have return successors, (220), 4 states have call predecessors, (220), 4 states have call successors, (220) Word has length 1006 [2021-11-12 23:20:26,841 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:20:26,892 INFO L225 Difference]: With dead ends: 18106 [2021-11-12 23:20:26,893 INFO L226 Difference]: Without dead ends: 10277 [2021-11-12 23:20:26,929 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=16, Invalid=26, Unknown=0, NotChecked=0, Total=42 [2021-11-12 23:20:26,930 INFO L933 BasicCegarLoop]: 6157 mSDtfsCounter, 4909 mSDsluCounter, 10210 mSDsCounter, 0 mSdLazyCounter, 5990 mSolverCounterSat, 38 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 29982.75ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 4910 SdHoareTripleChecker+Valid, 16219 SdHoareTripleChecker+Invalid, 6030 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 49.27ms SdHoareTripleChecker+Time, 38 IncrementalHoareTripleChecker+Valid, 5990 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 37453.66ms IncrementalHoareTripleChecker+Time [2021-11-12 23:20:26,930 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [4910 Valid, 16219 Invalid, 6030 Unknown, 0 Unchecked, 49.27ms Time], IncrementalHoareTripleChecker [38 Valid, 5990 Invalid, 2 Unknown, 0 Unchecked, 37453.66ms Time] [2021-11-12 23:20:26,942 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10277 states. [2021-11-12 23:20:29,424 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10277 to 10251. [2021-11-12 23:20:29,434 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 10251 states, 6126 states have (on average 1.219066274893895) internal successors, (7468), 6238 states have internal predecessors, (7468), 3940 states have call successors, (3940), 170 states have call predecessors, (3940), 184 states have return successors, (3999), 3852 states have call predecessors, (3999), 3938 states have call successors, (3999) [2021-11-12 23:20:29,487 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10251 states to 10251 states and 15407 transitions. [2021-11-12 23:20:29,491 INFO L78 Accepts]: Start accepts. Automaton has 10251 states and 15407 transitions. Word has length 1006 [2021-11-12 23:20:29,493 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:20:29,493 INFO L470 AbstractCegarLoop]: Abstraction has 10251 states and 15407 transitions. [2021-11-12 23:20:29,494 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 58.333333333333336) internal successors, (350), 6 states have internal predecessors, (350), 4 states have call successors, (221), 2 states have call predecessors, (221), 4 states have return successors, (220), 4 states have call predecessors, (220), 4 states have call successors, (220) [2021-11-12 23:20:29,495 INFO L276 IsEmpty]: Start isEmpty. Operand 10251 states and 15407 transitions. [2021-11-12 23:20:29,529 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1007 [2021-11-12 23:20:29,529 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:20:29,530 INFO L514 BasicCegarLoop]: trace histogram [209, 3, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 23:20:29,530 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-11-12 23:20:29,530 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:20:29,531 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:20:29,531 INFO L85 PathProgramCache]: Analyzing trace with hash -982683989, now seen corresponding path program 1 times [2021-11-12 23:20:29,531 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 23:20:29,532 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [444881419] [2021-11-12 23:20:29,532 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:20:29,532 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 23:20:29,740 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:20:30,249 INFO L134 CoverageAnalysis]: Checked inductivity of 43484 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 43484 trivial. 0 not checked. [2021-11-12 23:20:30,249 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 23:20:30,250 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [444881419] [2021-11-12 23:20:30,250 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [444881419] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-12 23:20:30,250 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-12 23:20:30,250 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-12 23:20:30,250 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1878827123] [2021-11-12 23:20:30,250 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-12 23:20:30,252 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-12 23:20:30,252 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 23:20:30,252 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-12 23:20:30,252 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-12 23:20:30,253 INFO L87 Difference]: Start difference. First operand 10251 states and 15407 transitions. Second operand has 5 states, 5 states have (on average 70.4) internal successors, (352), 5 states have internal predecessors, (352), 3 states have call successors, (221), 2 states have call predecessors, (221), 3 states have return successors, (220), 3 states have call predecessors, (220), 3 states have call successors, (220) [2021-11-12 23:20:32,292 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.04s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-12 23:20:34,414 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.04s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-12 23:20:36,056 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:20:36,056 INFO L93 Difference]: Finished difference Result 17645 states and 26657 transitions. [2021-11-12 23:20:36,056 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-12 23:20:36,056 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 70.4) internal successors, (352), 5 states have internal predecessors, (352), 3 states have call successors, (221), 2 states have call predecessors, (221), 3 states have return successors, (220), 3 states have call predecessors, (220), 3 states have call successors, (220) Word has length 1006 [2021-11-12 23:20:36,057 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:20:36,091 INFO L225 Difference]: With dead ends: 17645 [2021-11-12 23:20:36,091 INFO L226 Difference]: Without dead ends: 10260 [2021-11-12 23:20:36,116 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-12 23:20:36,116 INFO L933 BasicCegarLoop]: 5879 mSDtfsCounter, 2644 mSDsluCounter, 12438 mSDsCounter, 0 mSdLazyCounter, 349 mSolverCounterSat, 40 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5188.43ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 2647 SdHoareTripleChecker+Valid, 18203 SdHoareTripleChecker+Invalid, 391 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 18.11ms SdHoareTripleChecker+Time, 40 IncrementalHoareTripleChecker+Valid, 349 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5494.73ms IncrementalHoareTripleChecker+Time [2021-11-12 23:20:36,117 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2647 Valid, 18203 Invalid, 391 Unknown, 0 Unchecked, 18.11ms Time], IncrementalHoareTripleChecker [40 Valid, 349 Invalid, 2 Unknown, 0 Unchecked, 5494.73ms Time] [2021-11-12 23:20:36,128 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10260 states. [2021-11-12 23:20:38,229 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10260 to 10251. [2021-11-12 23:20:38,238 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 10251 states, 6126 states have (on average 1.2185765589291544) internal successors, (7465), 6238 states have internal predecessors, (7465), 3940 states have call successors, (3940), 170 states have call predecessors, (3940), 184 states have return successors, (3999), 3852 states have call predecessors, (3999), 3938 states have call successors, (3999) [2021-11-12 23:20:38,287 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10251 states to 10251 states and 15404 transitions. [2021-11-12 23:20:38,289 INFO L78 Accepts]: Start accepts. Automaton has 10251 states and 15404 transitions. Word has length 1006 [2021-11-12 23:20:38,290 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:20:38,290 INFO L470 AbstractCegarLoop]: Abstraction has 10251 states and 15404 transitions. [2021-11-12 23:20:38,291 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 70.4) internal successors, (352), 5 states have internal predecessors, (352), 3 states have call successors, (221), 2 states have call predecessors, (221), 3 states have return successors, (220), 3 states have call predecessors, (220), 3 states have call successors, (220) [2021-11-12 23:20:38,291 INFO L276 IsEmpty]: Start isEmpty. Operand 10251 states and 15404 transitions. [2021-11-12 23:20:38,323 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1007 [2021-11-12 23:20:38,323 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:20:38,324 INFO L514 BasicCegarLoop]: trace histogram [209, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 23:20:38,324 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-11-12 23:20:38,324 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:20:38,325 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:20:38,325 INFO L85 PathProgramCache]: Analyzing trace with hash 2035810795, now seen corresponding path program 1 times [2021-11-12 23:20:38,325 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 23:20:38,325 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1669271952] [2021-11-12 23:20:38,326 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:20:38,326 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 23:20:38,679 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:20:39,338 INFO L134 CoverageAnalysis]: Checked inductivity of 43492 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 43492 trivial. 0 not checked. [2021-11-12 23:20:39,338 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 23:20:39,338 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1669271952] [2021-11-12 23:20:39,338 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1669271952] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-12 23:20:39,338 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-12 23:20:39,339 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-12 23:20:39,339 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1135125198] [2021-11-12 23:20:39,339 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-12 23:20:39,340 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-12 23:20:39,340 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 23:20:39,341 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-12 23:20:39,341 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-12 23:20:39,341 INFO L87 Difference]: Start difference. First operand 10251 states and 15404 transitions. Second operand has 6 states, 6 states have (on average 57.666666666666664) internal successors, (346), 6 states have internal predecessors, (346), 4 states have call successors, (220), 2 states have call predecessors, (220), 4 states have return successors, (219), 4 states have call predecessors, (219), 4 states have call successors, (219) [2021-11-12 23:20:41,371 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.03s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-12 23:20:43,524 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.09s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-12 23:21:21,128 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:21:21,128 INFO L93 Difference]: Finished difference Result 15871 states and 23853 transitions. [2021-11-12 23:21:21,131 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-12 23:21:21,131 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 57.666666666666664) internal successors, (346), 6 states have internal predecessors, (346), 4 states have call successors, (220), 2 states have call predecessors, (220), 4 states have return successors, (219), 4 states have call predecessors, (219), 4 states have call successors, (219) Word has length 1006 [2021-11-12 23:21:21,133 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:21:21,167 INFO L225 Difference]: With dead ends: 15871 [2021-11-12 23:21:21,167 INFO L226 Difference]: Without dead ends: 7687 [2021-11-12 23:21:21,198 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=21, Invalid=35, Unknown=0, NotChecked=0, Total=56 [2021-11-12 23:21:21,199 INFO L933 BasicCegarLoop]: 6098 mSDtfsCounter, 6402 mSDsluCounter, 7754 mSDsCounter, 0 mSdLazyCounter, 5146 mSolverCounterSat, 2056 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 31902.28ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 6402 SdHoareTripleChecker+Valid, 13762 SdHoareTripleChecker+Invalid, 7204 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 49.34ms SdHoareTripleChecker+Time, 2056 IncrementalHoareTripleChecker+Valid, 5146 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 41063.63ms IncrementalHoareTripleChecker+Time [2021-11-12 23:21:21,199 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [6402 Valid, 13762 Invalid, 7204 Unknown, 0 Unchecked, 49.34ms Time], IncrementalHoareTripleChecker [2056 Valid, 5146 Invalid, 2 Unknown, 0 Unchecked, 41063.63ms Time] [2021-11-12 23:21:21,210 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7687 states. [2021-11-12 23:21:22,810 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7687 to 7671. [2021-11-12 23:21:22,815 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 7671 states, 4677 states have (on average 1.2227923882830873) internal successors, (5719), 4702 states have internal predecessors, (5719), 2861 states have call successors, (2861), 125 states have call predecessors, (2861), 132 states have return successors, (2889), 2849 states have call predecessors, (2889), 2859 states have call successors, (2889) [2021-11-12 23:21:22,839 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7671 states to 7671 states and 11469 transitions. [2021-11-12 23:21:22,841 INFO L78 Accepts]: Start accepts. Automaton has 7671 states and 11469 transitions. Word has length 1006 [2021-11-12 23:21:22,842 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:21:22,843 INFO L470 AbstractCegarLoop]: Abstraction has 7671 states and 11469 transitions. [2021-11-12 23:21:22,843 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 57.666666666666664) internal successors, (346), 6 states have internal predecessors, (346), 4 states have call successors, (220), 2 states have call predecessors, (220), 4 states have return successors, (219), 4 states have call predecessors, (219), 4 states have call successors, (219) [2021-11-12 23:21:22,843 INFO L276 IsEmpty]: Start isEmpty. Operand 7671 states and 11469 transitions. [2021-11-12 23:21:22,864 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1004 [2021-11-12 23:21:22,864 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:21:22,865 INFO L514 BasicCegarLoop]: trace histogram [209, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 23:21:22,865 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2021-11-12 23:21:22,866 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:21:22,866 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:21:22,867 INFO L85 PathProgramCache]: Analyzing trace with hash -1697603306, now seen corresponding path program 1 times [2021-11-12 23:21:22,867 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 23:21:22,867 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1406989040] [2021-11-12 23:21:22,867 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:21:22,867 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 23:21:23,079 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:21:23,755 INFO L134 CoverageAnalysis]: Checked inductivity of 43484 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 43479 trivial. 0 not checked. [2021-11-12 23:21:23,756 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 23:21:23,756 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1406989040] [2021-11-12 23:21:23,756 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1406989040] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-12 23:21:23,756 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [659834734] [2021-11-12 23:21:23,756 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:21:23,756 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 23:21:23,757 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_90b0c209-26ec-43c3-9ca9-e3e408617533/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 23:21:23,758 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_90b0c209-26ec-43c3-9ca9-e3e408617533/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 23:21:23,777 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_90b0c209-26ec-43c3-9ca9-e3e408617533/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-12 23:21:24,766 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:21:24,782 INFO L263 TraceCheckSpWp]: Trace formula consists of 3468 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-12 23:21:24,802 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:21:26,804 INFO L134 CoverageAnalysis]: Checked inductivity of 43484 backedges. 418 proven. 0 refuted. 0 times theorem prover too weak. 43066 trivial. 0 not checked. [2021-11-12 23:21:26,804 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:21:29,376 INFO L134 CoverageAnalysis]: Checked inductivity of 43484 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 43479 trivial. 0 not checked. [2021-11-12 23:21:29,376 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [659834734] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-12 23:21:29,376 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-12 23:21:29,377 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [6, 6] total 8 [2021-11-12 23:21:29,377 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1149086077] [2021-11-12 23:21:29,377 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-12 23:21:29,379 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-12 23:21:29,379 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 23:21:29,379 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-12 23:21:29,379 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2021-11-12 23:21:29,380 INFO L87 Difference]: Start difference. First operand 7671 states and 11469 transitions. Second operand has 5 states, 5 states have (on average 70.2) internal successors, (351), 5 states have internal predecessors, (351), 3 states have call successors, (219), 3 states have call predecessors, (219), 3 states have return successors, (218), 3 states have call predecessors, (218), 3 states have call successors, (218) [2021-11-12 23:21:31,419 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.04s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-12 23:21:33,570 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.04s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-12 23:22:09,115 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:22:09,115 INFO L93 Difference]: Finished difference Result 13600 states and 20389 transitions. [2021-11-12 23:22:09,118 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-12 23:22:09,119 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 70.2) internal successors, (351), 5 states have internal predecessors, (351), 3 states have call successors, (219), 3 states have call predecessors, (219), 3 states have return successors, (218), 3 states have call predecessors, (218), 3 states have call successors, (218) Word has length 1003 [2021-11-12 23:22:09,120 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:22:09,147 INFO L225 Difference]: With dead ends: 13600 [2021-11-12 23:22:09,148 INFO L226 Difference]: Without dead ends: 7441 [2021-11-12 23:22:09,167 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2011 GetRequests, 2002 SyntacticMatches, 2 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=24, Invalid=48, Unknown=0, NotChecked=0, Total=72 [2021-11-12 23:22:09,167 INFO L933 BasicCegarLoop]: 5527 mSDtfsCounter, 3480 mSDsluCounter, 9530 mSDsCounter, 0 mSdLazyCounter, 4363 mSolverCounterSat, 27 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 30138.02ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 3481 SdHoareTripleChecker+Valid, 14963 SdHoareTripleChecker+Invalid, 4392 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 41.10ms SdHoareTripleChecker+Time, 27 IncrementalHoareTripleChecker+Valid, 4363 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 39185.52ms IncrementalHoareTripleChecker+Time [2021-11-12 23:22:09,168 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3481 Valid, 14963 Invalid, 4392 Unknown, 0 Unchecked, 41.10ms Time], IncrementalHoareTripleChecker [27 Valid, 4363 Invalid, 2 Unknown, 0 Unchecked, 39185.52ms Time] [2021-11-12 23:22:09,178 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7441 states. [2021-11-12 23:22:10,522 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7441 to 7429. [2021-11-12 23:22:10,528 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 7429 states, 4500 states have (on average 1.2166666666666666) internal successors, (5475), 4525 states have internal predecessors, (5475), 2798 states have call successors, (2798), 123 states have call predecessors, (2798), 130 states have return successors, (2826), 2786 states have call predecessors, (2826), 2796 states have call successors, (2826) [2021-11-12 23:22:10,552 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7429 states to 7429 states and 11099 transitions. [2021-11-12 23:22:10,554 INFO L78 Accepts]: Start accepts. Automaton has 7429 states and 11099 transitions. Word has length 1003 [2021-11-12 23:22:10,555 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:22:10,556 INFO L470 AbstractCegarLoop]: Abstraction has 7429 states and 11099 transitions. [2021-11-12 23:22:10,556 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 70.2) internal successors, (351), 5 states have internal predecessors, (351), 3 states have call successors, (219), 3 states have call predecessors, (219), 3 states have return successors, (218), 3 states have call predecessors, (218), 3 states have call successors, (218) [2021-11-12 23:22:10,556 INFO L276 IsEmpty]: Start isEmpty. Operand 7429 states and 11099 transitions. [2021-11-12 23:22:10,573 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1006 [2021-11-12 23:22:10,573 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:22:10,574 INFO L514 BasicCegarLoop]: trace histogram [209, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 23:22:10,602 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_90b0c209-26ec-43c3-9ca9-e3e408617533/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-12 23:22:10,775 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_90b0c209-26ec-43c3-9ca9-e3e408617533/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 23:22:10,776 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:22:10,776 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:22:10,776 INFO L85 PathProgramCache]: Analyzing trace with hash -2077374148, now seen corresponding path program 1 times [2021-11-12 23:22:10,776 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 23:22:10,777 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1168663554] [2021-11-12 23:22:10,777 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:22:10,777 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 23:22:10,995 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:22:11,667 INFO L134 CoverageAnalysis]: Checked inductivity of 43493 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 43493 trivial. 0 not checked. [2021-11-12 23:22:11,667 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 23:22:11,667 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1168663554] [2021-11-12 23:22:11,668 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1168663554] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-12 23:22:11,668 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-12 23:22:11,668 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-12 23:22:11,668 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [372372568] [2021-11-12 23:22:11,668 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-12 23:22:11,670 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-12 23:22:11,670 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 23:22:11,670 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-12 23:22:11,670 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-12 23:22:11,671 INFO L87 Difference]: Start difference. First operand 7429 states and 11099 transitions. Second operand has 6 states, 6 states have (on average 57.666666666666664) internal successors, (346), 6 states have internal predecessors, (346), 3 states have call successors, (219), 2 states have call predecessors, (219), 4 states have return successors, (218), 3 states have call predecessors, (218), 3 states have call successors, (218) [2021-11-12 23:22:13,688 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-12 23:22:15,983 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.19s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-12 23:23:07,523 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:23:07,523 INFO L93 Difference]: Finished difference Result 11638 states and 17382 transitions. [2021-11-12 23:23:07,526 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-12 23:23:07,526 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 57.666666666666664) internal successors, (346), 6 states have internal predecessors, (346), 3 states have call successors, (219), 2 states have call predecessors, (219), 4 states have return successors, (218), 3 states have call predecessors, (218), 3 states have call successors, (218) Word has length 1005 [2021-11-12 23:23:07,528 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:23:07,553 INFO L225 Difference]: With dead ends: 11638 [2021-11-12 23:23:07,554 INFO L226 Difference]: Without dead ends: 5792 [2021-11-12 23:23:07,571 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=21, Invalid=35, Unknown=0, NotChecked=0, Total=56 [2021-11-12 23:23:07,572 INFO L933 BasicCegarLoop]: 6273 mSDtfsCounter, 4905 mSDsluCounter, 10595 mSDsCounter, 0 mSdLazyCounter, 6050 mSolverCounterSat, 36 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 41641.30ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 4907 SdHoareTripleChecker+Valid, 16708 SdHoareTripleChecker+Invalid, 6088 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 51.84ms SdHoareTripleChecker+Time, 36 IncrementalHoareTripleChecker+Valid, 6050 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 55133.41ms IncrementalHoareTripleChecker+Time [2021-11-12 23:23:07,573 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [4907 Valid, 16708 Invalid, 6088 Unknown, 0 Unchecked, 51.84ms Time], IncrementalHoareTripleChecker [36 Valid, 6050 Invalid, 2 Unknown, 0 Unchecked, 55133.41ms Time] [2021-11-12 23:23:07,580 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5792 states. [2021-11-12 23:23:08,339 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5792 to 5768. [2021-11-12 23:23:08,343 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5768 states, 3552 states have (on average 1.2300112612612613) internal successors, (4369), 3572 states have internal predecessors, (4369), 2104 states have call successors, (2104), 107 states have call predecessors, (2104), 111 states have return successors, (2109), 2093 states have call predecessors, (2109), 2103 states have call successors, (2109) [2021-11-12 23:23:08,359 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5768 states to 5768 states and 8582 transitions. [2021-11-12 23:23:08,362 INFO L78 Accepts]: Start accepts. Automaton has 5768 states and 8582 transitions. Word has length 1005 [2021-11-12 23:23:08,363 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:23:08,363 INFO L470 AbstractCegarLoop]: Abstraction has 5768 states and 8582 transitions. [2021-11-12 23:23:08,363 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 57.666666666666664) internal successors, (346), 6 states have internal predecessors, (346), 3 states have call successors, (219), 2 states have call predecessors, (219), 4 states have return successors, (218), 3 states have call predecessors, (218), 3 states have call successors, (218) [2021-11-12 23:23:08,363 INFO L276 IsEmpty]: Start isEmpty. Operand 5768 states and 8582 transitions. [2021-11-12 23:23:08,379 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1007 [2021-11-12 23:23:08,380 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:23:08,380 INFO L514 BasicCegarLoop]: trace histogram [209, 4, 4, 4, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 23:23:08,380 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2021-11-12 23:23:08,380 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:23:08,381 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:23:08,381 INFO L85 PathProgramCache]: Analyzing trace with hash -799394997, now seen corresponding path program 1 times [2021-11-12 23:23:08,381 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 23:23:08,381 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [395168811] [2021-11-12 23:23:08,381 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:23:08,382 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 23:23:08,573 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:23:09,105 INFO L134 CoverageAnalysis]: Checked inductivity of 43504 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 43504 trivial. 0 not checked. [2021-11-12 23:23:09,105 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 23:23:09,105 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [395168811] [2021-11-12 23:23:09,105 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [395168811] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-12 23:23:09,106 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-12 23:23:09,106 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-12 23:23:09,106 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1457452022] [2021-11-12 23:23:09,106 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-12 23:23:09,107 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-12 23:23:09,107 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 23:23:09,108 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-12 23:23:09,108 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-12 23:23:09,108 INFO L87 Difference]: Start difference. First operand 5768 states and 8582 transitions. Second operand has 5 states, 5 states have (on average 68.6) internal successors, (343), 5 states have internal predecessors, (343), 3 states have call successors, (220), 2 states have call predecessors, (220), 3 states have return successors, (219), 3 states have call predecessors, (219), 3 states have call successors, (219) [2021-11-12 23:23:11,125 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-12 23:23:13,277 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.04s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-12 23:23:15,176 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:23:15,176 INFO L93 Difference]: Finished difference Result 9410 states and 14019 transitions. [2021-11-12 23:23:15,177 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-12 23:23:15,177 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 68.6) internal successors, (343), 5 states have internal predecessors, (343), 3 states have call successors, (220), 2 states have call predecessors, (220), 3 states have return successors, (219), 3 states have call predecessors, (219), 3 states have call successors, (219) Word has length 1006 [2021-11-12 23:23:15,178 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:23:15,199 INFO L225 Difference]: With dead ends: 9410 [2021-11-12 23:23:15,199 INFO L226 Difference]: Without dead ends: 5775 [2021-11-12 23:23:15,209 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-12 23:23:15,209 INFO L933 BasicCegarLoop]: 5761 mSDtfsCounter, 1397 mSDsluCounter, 14842 mSDsCounter, 0 mSdLazyCounter, 391 mSolverCounterSat, 13 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5418.29ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 1400 SdHoareTripleChecker+Valid, 20495 SdHoareTripleChecker+Invalid, 406 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 20.03ms SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 391 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5798.97ms IncrementalHoareTripleChecker+Time [2021-11-12 23:23:15,210 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1400 Valid, 20495 Invalid, 406 Unknown, 0 Unchecked, 20.03ms Time], IncrementalHoareTripleChecker [13 Valid, 391 Invalid, 2 Unknown, 0 Unchecked, 5798.97ms Time] [2021-11-12 23:23:15,215 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5775 states. [2021-11-12 23:23:15,929 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5775 to 5762. [2021-11-12 23:23:15,934 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5762 states, 3548 states have (on average 1.2294250281848929) internal successors, (4362), 3568 states have internal predecessors, (4362), 2102 states have call successors, (2102), 107 states have call predecessors, (2102), 111 states have return successors, (2107), 2091 states have call predecessors, (2107), 2101 states have call successors, (2107) [2021-11-12 23:23:15,957 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5762 states to 5762 states and 8571 transitions. [2021-11-12 23:23:15,958 INFO L78 Accepts]: Start accepts. Automaton has 5762 states and 8571 transitions. Word has length 1006 [2021-11-12 23:23:15,959 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:23:15,960 INFO L470 AbstractCegarLoop]: Abstraction has 5762 states and 8571 transitions. [2021-11-12 23:23:15,960 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 68.6) internal successors, (343), 5 states have internal predecessors, (343), 3 states have call successors, (220), 2 states have call predecessors, (220), 3 states have return successors, (219), 3 states have call predecessors, (219), 3 states have call successors, (219) [2021-11-12 23:23:15,960 INFO L276 IsEmpty]: Start isEmpty. Operand 5762 states and 8571 transitions. [2021-11-12 23:23:15,972 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1011 [2021-11-12 23:23:15,973 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:23:15,973 INFO L514 BasicCegarLoop]: trace histogram [209, 4, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 23:23:15,973 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2021-11-12 23:23:15,973 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:23:15,974 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:23:15,974 INFO L85 PathProgramCache]: Analyzing trace with hash -1217567711, now seen corresponding path program 1 times [2021-11-12 23:23:15,974 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 23:23:15,974 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1400475297] [2021-11-12 23:23:15,975 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:23:15,975 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 23:23:16,166 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:23:16,765 INFO L134 CoverageAnalysis]: Checked inductivity of 43494 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 43494 trivial. 0 not checked. [2021-11-12 23:23:16,765 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 23:23:16,765 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1400475297] [2021-11-12 23:23:16,765 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1400475297] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-12 23:23:16,766 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-12 23:23:16,766 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-12 23:23:16,766 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1474945344] [2021-11-12 23:23:16,766 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-12 23:23:16,767 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-12 23:23:16,767 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 23:23:16,768 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-12 23:23:16,768 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-12 23:23:16,768 INFO L87 Difference]: Start difference. First operand 5762 states and 8571 transitions. Second operand has 5 states, 5 states have (on average 69.8) internal successors, (349), 5 states have internal predecessors, (349), 3 states have call successors, (221), 2 states have call predecessors, (221), 3 states have return successors, (220), 3 states have call predecessors, (220), 3 states have call successors, (220) [2021-11-12 23:23:18,786 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-12 23:23:20,919 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.05s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-12 23:23:45,159 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:23:45,159 INFO L93 Difference]: Finished difference Result 9759 states and 14561 transitions. [2021-11-12 23:23:45,163 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-12 23:23:45,163 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 69.8) internal successors, (349), 5 states have internal predecessors, (349), 3 states have call successors, (221), 2 states have call predecessors, (221), 3 states have return successors, (220), 3 states have call predecessors, (220), 3 states have call successors, (220) Word has length 1010 [2021-11-12 23:23:45,164 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:23:45,184 INFO L225 Difference]: With dead ends: 9759 [2021-11-12 23:23:45,184 INFO L226 Difference]: Without dead ends: 5769 [2021-11-12 23:23:45,198 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-12 23:23:45,198 INFO L933 BasicCegarLoop]: 5521 mSDtfsCounter, 4965 mSDsluCounter, 7997 mSDsCounter, 0 mSdLazyCounter, 238 mSolverCounterSat, 2045 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 20367.28ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 4966 SdHoareTripleChecker+Valid, 13457 SdHoareTripleChecker+Invalid, 2285 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 37.84ms SdHoareTripleChecker+Time, 2045 IncrementalHoareTripleChecker+Valid, 238 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 27941.65ms IncrementalHoareTripleChecker+Time [2021-11-12 23:23:45,198 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [4966 Valid, 13457 Invalid, 2285 Unknown, 0 Unchecked, 37.84ms Time], IncrementalHoareTripleChecker [2045 Valid, 238 Invalid, 2 Unknown, 0 Unchecked, 27941.65ms Time] [2021-11-12 23:23:45,205 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5769 states. [2021-11-12 23:23:45,931 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5769 to 5756. [2021-11-12 23:23:45,936 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5756 states, 3545 states have (on average 1.2287729196050776) internal successors, (4356), 3565 states have internal predecessors, (4356), 2099 states have call successors, (2099), 107 states have call predecessors, (2099), 111 states have return successors, (2104), 2088 states have call predecessors, (2104), 2098 states have call successors, (2104) [2021-11-12 23:23:45,953 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5756 states to 5756 states and 8559 transitions. [2021-11-12 23:23:45,954 INFO L78 Accepts]: Start accepts. Automaton has 5756 states and 8559 transitions. Word has length 1010 [2021-11-12 23:23:45,955 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:23:45,955 INFO L470 AbstractCegarLoop]: Abstraction has 5756 states and 8559 transitions. [2021-11-12 23:23:45,956 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 69.8) internal successors, (349), 5 states have internal predecessors, (349), 3 states have call successors, (221), 2 states have call predecessors, (221), 3 states have return successors, (220), 3 states have call predecessors, (220), 3 states have call successors, (220) [2021-11-12 23:23:45,956 INFO L276 IsEmpty]: Start isEmpty. Operand 5756 states and 8559 transitions. [2021-11-12 23:23:45,968 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1011 [2021-11-12 23:23:45,968 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:23:45,969 INFO L514 BasicCegarLoop]: trace histogram [209, 5, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 23:23:45,969 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2021-11-12 23:23:45,969 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:23:45,970 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:23:45,970 INFO L85 PathProgramCache]: Analyzing trace with hash 1982185665, now seen corresponding path program 1 times [2021-11-12 23:23:45,970 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 23:23:45,970 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1465853588] [2021-11-12 23:23:45,971 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:23:45,971 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 23:23:46,173 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:23:46,712 INFO L134 CoverageAnalysis]: Checked inductivity of 43502 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 43502 trivial. 0 not checked. [2021-11-12 23:23:46,713 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 23:23:46,713 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1465853588] [2021-11-12 23:23:46,713 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1465853588] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-12 23:23:46,713 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-12 23:23:46,713 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-12 23:23:46,713 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [86272865] [2021-11-12 23:23:46,713 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-12 23:23:46,715 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-12 23:23:46,715 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 23:23:46,715 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-12 23:23:46,715 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-12 23:23:46,716 INFO L87 Difference]: Start difference. First operand 5756 states and 8559 transitions. Second operand has 5 states, 5 states have (on average 69.6) internal successors, (348), 5 states have internal predecessors, (348), 3 states have call successors, (221), 2 states have call predecessors, (221), 3 states have return successors, (220), 3 states have call predecessors, (220), 3 states have call successors, (220) [2021-11-12 23:23:48,737 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-12 23:23:50,880 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.04s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-12 23:24:06,541 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:24:06,542 INFO L93 Difference]: Finished difference Result 9333 states and 13921 transitions. [2021-11-12 23:24:06,544 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-12 23:24:06,544 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 69.6) internal successors, (348), 5 states have internal predecessors, (348), 3 states have call successors, (221), 2 states have call predecessors, (221), 3 states have return successors, (220), 3 states have call predecessors, (220), 3 states have call successors, (220) Word has length 1010 [2021-11-12 23:24:06,545 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:24:06,559 INFO L225 Difference]: With dead ends: 9333 [2021-11-12 23:24:06,560 INFO L226 Difference]: Without dead ends: 5770 [2021-11-12 23:24:06,566 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-12 23:24:06,567 INFO L933 BasicCegarLoop]: 5667 mSDtfsCounter, 3756 mSDsluCounter, 8948 mSDsCounter, 0 mSdLazyCounter, 224 mSolverCounterSat, 1548 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 14699.12ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 3759 SdHoareTripleChecker+Valid, 14550 SdHoareTripleChecker+Invalid, 1774 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 33.47ms SdHoareTripleChecker+Time, 1548 IncrementalHoareTripleChecker+Valid, 224 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 19465.41ms IncrementalHoareTripleChecker+Time [2021-11-12 23:24:06,567 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3759 Valid, 14550 Invalid, 1774 Unknown, 0 Unchecked, 33.47ms Time], IncrementalHoareTripleChecker [1548 Valid, 224 Invalid, 2 Unknown, 0 Unchecked, 19465.41ms Time] [2021-11-12 23:24:06,574 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5770 states. [2021-11-12 23:24:07,200 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5770 to 5756. [2021-11-12 23:24:07,205 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5756 states, 3545 states have (on average 1.2282087447108603) internal successors, (4354), 3565 states have internal predecessors, (4354), 2099 states have call successors, (2099), 107 states have call predecessors, (2099), 111 states have return successors, (2104), 2088 states have call predecessors, (2104), 2098 states have call successors, (2104) [2021-11-12 23:24:07,227 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5756 states to 5756 states and 8557 transitions. [2021-11-12 23:24:07,228 INFO L78 Accepts]: Start accepts. Automaton has 5756 states and 8557 transitions. Word has length 1010 [2021-11-12 23:24:07,229 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:24:07,229 INFO L470 AbstractCegarLoop]: Abstraction has 5756 states and 8557 transitions. [2021-11-12 23:24:07,230 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 69.6) internal successors, (348), 5 states have internal predecessors, (348), 3 states have call successors, (221), 2 states have call predecessors, (221), 3 states have return successors, (220), 3 states have call predecessors, (220), 3 states have call successors, (220) [2021-11-12 23:24:07,230 INFO L276 IsEmpty]: Start isEmpty. Operand 5756 states and 8557 transitions. [2021-11-12 23:24:07,242 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1011 [2021-11-12 23:24:07,242 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:24:07,243 INFO L514 BasicCegarLoop]: trace histogram [209, 5, 5, 5, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 23:24:07,243 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2021-11-12 23:24:07,243 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:24:07,244 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:24:07,244 INFO L85 PathProgramCache]: Analyzing trace with hash -1629238911, now seen corresponding path program 1 times [2021-11-12 23:24:07,244 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 23:24:07,244 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1322342582] [2021-11-12 23:24:07,244 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:24:07,244 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 23:24:07,481 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:24:08,055 INFO L134 CoverageAnalysis]: Checked inductivity of 43520 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 43520 trivial. 0 not checked. [2021-11-12 23:24:08,055 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 23:24:08,055 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1322342582] [2021-11-12 23:24:08,055 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1322342582] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-12 23:24:08,055 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-12 23:24:08,056 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-12 23:24:08,056 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [254342375] [2021-11-12 23:24:08,056 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-12 23:24:08,057 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-12 23:24:08,057 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 23:24:08,057 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-12 23:24:08,057 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-12 23:24:08,058 INFO L87 Difference]: Start difference. First operand 5756 states and 8557 transitions. Second operand has 5 states, 5 states have (on average 68.4) internal successors, (342), 5 states have internal predecessors, (342), 3 states have call successors, (221), 2 states have call predecessors, (221), 3 states have return successors, (220), 3 states have call predecessors, (220), 3 states have call successors, (220) [2021-11-12 23:24:10,078 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-12 23:24:12,220 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.04s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-12 23:24:23,026 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:24:23,026 INFO L93 Difference]: Finished difference Result 9386 states and 13973 transitions. [2021-11-12 23:24:23,026 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-12 23:24:23,027 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 68.4) internal successors, (342), 5 states have internal predecessors, (342), 3 states have call successors, (221), 2 states have call predecessors, (221), 3 states have return successors, (220), 3 states have call predecessors, (220), 3 states have call successors, (220) Word has length 1010 [2021-11-12 23:24:23,028 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:24:23,048 INFO L225 Difference]: With dead ends: 9386 [2021-11-12 23:24:23,048 INFO L226 Difference]: Without dead ends: 5763 [2021-11-12 23:24:23,060 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-12 23:24:23,060 INFO L933 BasicCegarLoop]: 5748 mSDtfsCounter, 2061 mSDsluCounter, 10305 mSDsCounter, 0 mSdLazyCounter, 290 mSolverCounterSat, 709 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 11267.13ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 2064 SdHoareTripleChecker+Valid, 15971 SdHoareTripleChecker+Invalid, 1001 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 25.63ms SdHoareTripleChecker+Time, 709 IncrementalHoareTripleChecker+Valid, 290 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 14635.81ms IncrementalHoareTripleChecker+Time [2021-11-12 23:24:23,061 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2064 Valid, 15971 Invalid, 1001 Unknown, 0 Unchecked, 25.63ms Time], IncrementalHoareTripleChecker [709 Valid, 290 Invalid, 2 Unknown, 0 Unchecked, 14635.81ms Time] [2021-11-12 23:24:23,067 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5763 states. [2021-11-12 23:24:23,827 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5763 to 5750. [2021-11-12 23:24:23,832 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5750 states, 3541 states have (on average 1.227619316577238) internal successors, (4347), 3561 states have internal predecessors, (4347), 2097 states have call successors, (2097), 107 states have call predecessors, (2097), 111 states have return successors, (2102), 2086 states have call predecessors, (2102), 2096 states have call successors, (2102) [2021-11-12 23:24:23,851 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5750 states to 5750 states and 8546 transitions. [2021-11-12 23:24:23,852 INFO L78 Accepts]: Start accepts. Automaton has 5750 states and 8546 transitions. Word has length 1010 [2021-11-12 23:24:23,853 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:24:23,853 INFO L470 AbstractCegarLoop]: Abstraction has 5750 states and 8546 transitions. [2021-11-12 23:24:23,853 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 68.4) internal successors, (342), 5 states have internal predecessors, (342), 3 states have call successors, (221), 2 states have call predecessors, (221), 3 states have return successors, (220), 3 states have call predecessors, (220), 3 states have call successors, (220) [2021-11-12 23:24:23,853 INFO L276 IsEmpty]: Start isEmpty. Operand 5750 states and 8546 transitions. [2021-11-12 23:24:23,871 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1011 [2021-11-12 23:24:23,872 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:24:23,872 INFO L514 BasicCegarLoop]: trace histogram [209, 4, 4, 4, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 23:24:23,873 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2021-11-12 23:24:23,873 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:24:23,873 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:24:23,874 INFO L85 PathProgramCache]: Analyzing trace with hash 1473043384, now seen corresponding path program 1 times [2021-11-12 23:24:23,874 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 23:24:23,874 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [734779474] [2021-11-12 23:24:23,875 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:24:23,875 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 23:24:24,065 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:24:24,636 INFO L134 CoverageAnalysis]: Checked inductivity of 43505 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 43505 trivial. 0 not checked. [2021-11-12 23:24:24,636 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 23:24:24,636 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [734779474] [2021-11-12 23:24:24,636 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [734779474] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-12 23:24:24,636 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-12 23:24:24,637 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-12 23:24:24,637 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [28134361] [2021-11-12 23:24:24,637 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-12 23:24:24,638 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-12 23:24:24,638 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 23:24:24,639 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-12 23:24:24,639 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-12 23:24:24,639 INFO L87 Difference]: Start difference. First operand 5750 states and 8546 transitions. Second operand has 5 states, 5 states have (on average 69.2) internal successors, (346), 5 states have internal predecessors, (346), 3 states have call successors, (220), 2 states have call predecessors, (220), 3 states have return successors, (219), 3 states have call predecessors, (219), 3 states have call successors, (219) [2021-11-12 23:24:26,665 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.03s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-12 23:24:28,807 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.06s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-12 23:24:30,997 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:24:30,997 INFO L93 Difference]: Finished difference Result 9390 states and 13978 transitions. [2021-11-12 23:24:30,998 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-12 23:24:30,998 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 69.2) internal successors, (346), 5 states have internal predecessors, (346), 3 states have call successors, (220), 2 states have call predecessors, (220), 3 states have return successors, (219), 3 states have call predecessors, (219), 3 states have call successors, (219) Word has length 1010 [2021-11-12 23:24:30,999 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:24:31,018 INFO L225 Difference]: With dead ends: 9390 [2021-11-12 23:24:31,018 INFO L226 Difference]: Without dead ends: 5759 [2021-11-12 23:24:31,032 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-12 23:24:31,033 INFO L933 BasicCegarLoop]: 5730 mSDtfsCounter, 1479 mSDsluCounter, 14684 mSDsCounter, 0 mSdLazyCounter, 394 mSolverCounterSat, 14 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5631.21ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 1482 SdHoareTripleChecker+Valid, 20304 SdHoareTripleChecker+Invalid, 410 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 20.67ms SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 394 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 6069.34ms IncrementalHoareTripleChecker+Time [2021-11-12 23:24:31,033 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1482 Valid, 20304 Invalid, 410 Unknown, 0 Unchecked, 20.67ms Time], IncrementalHoareTripleChecker [14 Valid, 394 Invalid, 2 Unknown, 0 Unchecked, 6069.34ms Time] [2021-11-12 23:24:31,040 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5759 states. [2021-11-12 23:24:31,754 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5759 to 5747. [2021-11-12 23:24:31,758 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5747 states, 3539 states have (on average 1.2271828200056514) internal successors, (4343), 3559 states have internal predecessors, (4343), 2096 states have call successors, (2096), 107 states have call predecessors, (2096), 111 states have return successors, (2101), 2085 states have call predecessors, (2101), 2095 states have call successors, (2101) [2021-11-12 23:24:31,776 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5747 states to 5747 states and 8540 transitions. [2021-11-12 23:24:31,777 INFO L78 Accepts]: Start accepts. Automaton has 5747 states and 8540 transitions. Word has length 1010 [2021-11-12 23:24:31,778 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:24:31,778 INFO L470 AbstractCegarLoop]: Abstraction has 5747 states and 8540 transitions. [2021-11-12 23:24:31,778 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 69.2) internal successors, (346), 5 states have internal predecessors, (346), 3 states have call successors, (220), 2 states have call predecessors, (220), 3 states have return successors, (219), 3 states have call predecessors, (219), 3 states have call successors, (219) [2021-11-12 23:24:31,778 INFO L276 IsEmpty]: Start isEmpty. Operand 5747 states and 8540 transitions. [2021-11-12 23:24:31,796 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1015 [2021-11-12 23:24:31,796 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:24:31,797 INFO L514 BasicCegarLoop]: trace histogram [209, 6, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 23:24:31,797 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2021-11-12 23:24:31,797 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:24:31,798 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:24:31,798 INFO L85 PathProgramCache]: Analyzing trace with hash -537476828, now seen corresponding path program 1 times [2021-11-12 23:24:31,799 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 23:24:31,799 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [401886288] [2021-11-12 23:24:31,799 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:24:31,799 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 23:24:32,210 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:24:32,647 INFO L134 CoverageAnalysis]: Checked inductivity of 43512 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 43512 trivial. 0 not checked. [2021-11-12 23:24:32,647 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 23:24:32,647 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [401886288] [2021-11-12 23:24:32,647 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [401886288] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-12 23:24:32,647 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-12 23:24:32,647 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-12 23:24:32,648 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1219918523] [2021-11-12 23:24:32,648 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-12 23:24:32,649 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-12 23:24:32,649 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 23:24:32,649 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-12 23:24:32,649 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-12 23:24:32,650 INFO L87 Difference]: Start difference. First operand 5747 states and 8540 transitions. Second operand has 6 states, 6 states have (on average 58.166666666666664) internal successors, (349), 5 states have internal predecessors, (349), 3 states have call successors, (222), 3 states have call predecessors, (222), 2 states have return successors, (221), 3 states have call predecessors, (221), 3 states have call successors, (221) [2021-11-12 23:24:34,668 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-12 23:24:44,533 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.06s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-12 23:25:44,572 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:25:44,573 INFO L93 Difference]: Finished difference Result 9792 states and 14584 transitions. [2021-11-12 23:25:44,573 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-12 23:25:44,573 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 58.166666666666664) internal successors, (349), 5 states have internal predecessors, (349), 3 states have call successors, (222), 3 states have call predecessors, (222), 2 states have return successors, (221), 3 states have call predecessors, (221), 3 states have call successors, (221) Word has length 1014 [2021-11-12 23:25:44,574 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:25:44,597 INFO L225 Difference]: With dead ends: 9792 [2021-11-12 23:25:44,598 INFO L226 Difference]: Without dead ends: 9790 [2021-11-12 23:25:44,601 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=27, Invalid=45, Unknown=0, NotChecked=0, Total=72 [2021-11-12 23:25:44,602 INFO L933 BasicCegarLoop]: 5135 mSDtfsCounter, 3694 mSDsluCounter, 14545 mSDsCounter, 0 mSdLazyCounter, 9304 mSolverCounterSat, 3168 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 57163.24ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 4849 SdHoareTripleChecker+Valid, 19658 SdHoareTripleChecker+Invalid, 12474 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 155.01ms SdHoareTripleChecker+Time, 3168 IncrementalHoareTripleChecker+Valid, 9304 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 70999.45ms IncrementalHoareTripleChecker+Time [2021-11-12 23:25:44,602 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [4849 Valid, 19658 Invalid, 12474 Unknown, 0 Unchecked, 155.01ms Time], IncrementalHoareTripleChecker [3168 Valid, 9304 Invalid, 2 Unknown, 0 Unchecked, 70999.45ms Time] [2021-11-12 23:25:44,610 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9790 states. [2021-11-12 23:25:45,929 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9790 to 8163. [2021-11-12 23:25:45,934 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 8163 states, 5011 states have (on average 1.2201157453602076) internal successors, (6114), 5039 states have internal predecessors, (6114), 3007 states have call successors, (3007), 136 states have call predecessors, (3007), 144 states have return successors, (3038), 2992 states have call predecessors, (3038), 3005 states have call successors, (3038) [2021-11-12 23:25:45,957 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8163 states to 8163 states and 12159 transitions. [2021-11-12 23:25:45,958 INFO L78 Accepts]: Start accepts. Automaton has 8163 states and 12159 transitions. Word has length 1014 [2021-11-12 23:25:45,959 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:25:45,959 INFO L470 AbstractCegarLoop]: Abstraction has 8163 states and 12159 transitions. [2021-11-12 23:25:45,959 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 58.166666666666664) internal successors, (349), 5 states have internal predecessors, (349), 3 states have call successors, (222), 3 states have call predecessors, (222), 2 states have return successors, (221), 3 states have call predecessors, (221), 3 states have call successors, (221) [2021-11-12 23:25:45,959 INFO L276 IsEmpty]: Start isEmpty. Operand 8163 states and 12159 transitions. [2021-11-12 23:25:45,975 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1042 [2021-11-12 23:25:45,975 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:25:45,976 INFO L514 BasicCegarLoop]: trace histogram [210, 6, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 23:25:45,976 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2021-11-12 23:25:45,976 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:25:45,976 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:25:45,977 INFO L85 PathProgramCache]: Analyzing trace with hash -956075822, now seen corresponding path program 1 times [2021-11-12 23:25:45,977 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 23:25:45,977 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [710245532] [2021-11-12 23:25:45,977 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:25:45,977 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 23:25:46,161 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-12 23:25:46,161 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1411347793] [2021-11-12 23:25:46,161 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:25:46,162 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 23:25:46,162 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_90b0c209-26ec-43c3-9ca9-e3e408617533/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 23:25:46,163 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_90b0c209-26ec-43c3-9ca9-e3e408617533/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 23:25:46,180 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_90b0c209-26ec-43c3-9ca9-e3e408617533/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-12 23:25:47,327 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:25:47,346 INFO L263 TraceCheckSpWp]: Trace formula consists of 3666 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-12 23:25:47,367 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:25:49,319 INFO L134 CoverageAnalysis]: Checked inductivity of 43932 backedges. 858 proven. 0 refuted. 0 times theorem prover too weak. 43074 trivial. 0 not checked. [2021-11-12 23:25:49,319 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:25:52,080 INFO L134 CoverageAnalysis]: Checked inductivity of 43932 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 43932 trivial. 0 not checked. [2021-11-12 23:25:52,080 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 23:25:52,081 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [710245532] [2021-11-12 23:25:52,081 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-12 23:25:52,081 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1411347793] [2021-11-12 23:25:52,081 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1411347793] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-12 23:25:52,081 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-12 23:25:52,082 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5, 6] imperfect sequences [] total 8 [2021-11-12 23:25:52,082 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1659526762] [2021-11-12 23:25:52,082 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-12 23:25:52,084 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-12 23:25:52,084 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 23:25:52,084 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-12 23:25:52,084 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2021-11-12 23:25:52,085 INFO L87 Difference]: Start difference. First operand 8163 states and 12159 transitions. Second operand has 8 states, 8 states have (on average 49.375) internal successors, (395), 8 states have internal predecessors, (395), 3 states have call successors, (244), 3 states have call predecessors, (244), 4 states have return successors, (243), 3 states have call predecessors, (243), 3 states have call successors, (243) [2021-11-12 23:25:54,101 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-12 23:25:56,257 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.06s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-12 23:26:42,875 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:26:42,875 INFO L93 Difference]: Finished difference Result 14789 states and 22059 transitions. [2021-11-12 23:26:42,876 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-12 23:26:42,877 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 49.375) internal successors, (395), 8 states have internal predecessors, (395), 3 states have call successors, (244), 3 states have call predecessors, (244), 4 states have return successors, (243), 3 states have call predecessors, (243), 3 states have call successors, (243) Word has length 1041 [2021-11-12 23:26:42,878 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:26:42,911 INFO L225 Difference]: With dead ends: 14789 [2021-11-12 23:26:42,912 INFO L226 Difference]: Without dead ends: 9262 [2021-11-12 23:26:42,928 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2081 GetRequests, 2074 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=24, Invalid=48, Unknown=0, NotChecked=0, Total=72 [2021-11-12 23:26:42,928 INFO L933 BasicCegarLoop]: 6192 mSDtfsCounter, 5888 mSDsluCounter, 10017 mSDsCounter, 0 mSdLazyCounter, 7672 mSolverCounterSat, 1550 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 41262.20ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 5894 SdHoareTripleChecker+Valid, 16092 SdHoareTripleChecker+Invalid, 9224 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 67.47ms SdHoareTripleChecker+Time, 1550 IncrementalHoareTripleChecker+Valid, 7672 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 50088.81ms IncrementalHoareTripleChecker+Time [2021-11-12 23:26:42,929 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5894 Valid, 16092 Invalid, 9224 Unknown, 0 Unchecked, 67.47ms Time], IncrementalHoareTripleChecker [1550 Valid, 7672 Invalid, 2 Unknown, 0 Unchecked, 50088.81ms Time] [2021-11-12 23:26:42,937 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9262 states. [2021-11-12 23:26:44,231 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9262 to 8701. [2021-11-12 23:26:44,238 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 8701 states, 5401 states have (on average 1.2294019625995185) internal successors, (6640), 5431 states have internal predecessors, (6640), 3139 states have call successors, (3139), 150 states have call predecessors, (3139), 160 states have return successors, (3172), 3124 states have call predecessors, (3172), 3137 states have call successors, (3172) [2021-11-12 23:26:44,267 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8701 states to 8701 states and 12951 transitions. [2021-11-12 23:26:44,269 INFO L78 Accepts]: Start accepts. Automaton has 8701 states and 12951 transitions. Word has length 1041 [2021-11-12 23:26:44,270 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:26:44,270 INFO L470 AbstractCegarLoop]: Abstraction has 8701 states and 12951 transitions. [2021-11-12 23:26:44,271 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 49.375) internal successors, (395), 8 states have internal predecessors, (395), 3 states have call successors, (244), 3 states have call predecessors, (244), 4 states have return successors, (243), 3 states have call predecessors, (243), 3 states have call successors, (243) [2021-11-12 23:26:44,271 INFO L276 IsEmpty]: Start isEmpty. Operand 8701 states and 12951 transitions. [2021-11-12 23:26:44,289 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1042 [2021-11-12 23:26:44,289 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:26:44,290 INFO L514 BasicCegarLoop]: trace histogram [210, 6, 6, 6, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 23:26:44,317 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_90b0c209-26ec-43c3-9ca9-e3e408617533/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-12 23:26:44,490 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_90b0c209-26ec-43c3-9ca9-e3e408617533/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 23:26:44,491 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:26:44,491 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:26:44,491 INFO L85 PathProgramCache]: Analyzing trace with hash -52873710, now seen corresponding path program 1 times [2021-11-12 23:26:44,491 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 23:26:44,492 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [637238133] [2021-11-12 23:26:44,492 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:26:44,492 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 23:26:44,692 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-12 23:26:44,692 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [227720434] [2021-11-12 23:26:44,693 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:26:44,693 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 23:26:44,693 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_90b0c209-26ec-43c3-9ca9-e3e408617533/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 23:26:44,698 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_90b0c209-26ec-43c3-9ca9-e3e408617533/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 23:26:44,713 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_90b0c209-26ec-43c3-9ca9-e3e408617533/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-12 23:26:45,728 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:26:45,749 INFO L263 TraceCheckSpWp]: Trace formula consists of 3672 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-12 23:26:45,767 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:26:47,789 INFO L134 CoverageAnalysis]: Checked inductivity of 43960 backedges. 874 proven. 0 refuted. 0 times theorem prover too weak. 43086 trivial. 0 not checked. [2021-11-12 23:26:47,789 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:26:50,727 INFO L134 CoverageAnalysis]: Checked inductivity of 43960 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 43960 trivial. 0 not checked. [2021-11-12 23:26:50,727 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 23:26:50,727 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [637238133] [2021-11-12 23:26:50,727 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-12 23:26:50,728 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [227720434] [2021-11-12 23:26:50,728 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [227720434] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-12 23:26:50,728 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-12 23:26:50,729 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5, 6] imperfect sequences [] total 8 [2021-11-12 23:26:50,729 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [165272811] [2021-11-12 23:26:50,729 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-12 23:26:50,733 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-12 23:26:50,733 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 23:26:50,733 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-12 23:26:50,734 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2021-11-12 23:26:50,734 INFO L87 Difference]: Start difference. First operand 8701 states and 12951 transitions. Second operand has 8 states, 8 states have (on average 48.125) internal successors, (385), 8 states have internal predecessors, (385), 3 states have call successors, (244), 3 states have call predecessors, (244), 4 states have return successors, (243), 3 states have call predecessors, (243), 3 states have call successors, (243) [2021-11-12 23:26:52,758 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-12 23:26:54,863 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.04s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-12 23:27:35,435 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:27:35,435 INFO L93 Difference]: Finished difference Result 14065 states and 20977 transitions. [2021-11-12 23:27:35,436 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-12 23:27:35,436 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 48.125) internal successors, (385), 8 states have internal predecessors, (385), 3 states have call successors, (244), 3 states have call predecessors, (244), 4 states have return successors, (243), 3 states have call predecessors, (243), 3 states have call successors, (243) Word has length 1041 [2021-11-12 23:27:35,437 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:27:35,459 INFO L225 Difference]: With dead ends: 14065 [2021-11-12 23:27:35,459 INFO L226 Difference]: Without dead ends: 8441 [2021-11-12 23:27:35,469 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2082 GetRequests, 2074 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=30, Invalid=60, Unknown=0, NotChecked=0, Total=90 [2021-11-12 23:27:35,470 INFO L933 BasicCegarLoop]: 5840 mSDtfsCounter, 7009 mSDsluCounter, 7438 mSDsCounter, 0 mSdLazyCounter, 5839 mSolverCounterSat, 2746 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 35651.29ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 7010 SdHoareTripleChecker+Valid, 13169 SdHoareTripleChecker+Invalid, 8587 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 57.86ms SdHoareTripleChecker+Time, 2746 IncrementalHoareTripleChecker+Valid, 5839 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 43950.77ms IncrementalHoareTripleChecker+Time [2021-11-12 23:27:35,470 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [7010 Valid, 13169 Invalid, 8587 Unknown, 0 Unchecked, 57.86ms Time], IncrementalHoareTripleChecker [2746 Valid, 5839 Invalid, 2 Unknown, 0 Unchecked, 43950.77ms Time] [2021-11-12 23:27:35,477 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8441 states. [2021-11-12 23:27:36,645 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8441 to 8420. [2021-11-12 23:27:36,651 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 8420 states, 5198 states have (on average 1.2239322816467872) internal successors, (6362), 5227 states have internal predecessors, (6362), 3069 states have call successors, (3069), 143 states have call predecessors, (3069), 152 states have return successors, (3101), 3054 states have call predecessors, (3101), 3067 states have call successors, (3101) [2021-11-12 23:27:36,675 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8420 states to 8420 states and 12532 transitions. [2021-11-12 23:27:36,677 INFO L78 Accepts]: Start accepts. Automaton has 8420 states and 12532 transitions. Word has length 1041 [2021-11-12 23:27:36,678 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:27:36,678 INFO L470 AbstractCegarLoop]: Abstraction has 8420 states and 12532 transitions. [2021-11-12 23:27:36,678 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 48.125) internal successors, (385), 8 states have internal predecessors, (385), 3 states have call successors, (244), 3 states have call predecessors, (244), 4 states have return successors, (243), 3 states have call predecessors, (243), 3 states have call successors, (243) [2021-11-12 23:27:36,678 INFO L276 IsEmpty]: Start isEmpty. Operand 8420 states and 12532 transitions. [2021-11-12 23:27:36,700 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1043 [2021-11-12 23:27:36,700 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:27:36,701 INFO L514 BasicCegarLoop]: trace histogram [210, 5, 5, 5, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 23:27:36,727 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_90b0c209-26ec-43c3-9ca9-e3e408617533/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2021-11-12 23:27:36,901 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_90b0c209-26ec-43c3-9ca9-e3e408617533/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 23:27:36,902 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:27:36,902 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:27:36,902 INFO L85 PathProgramCache]: Analyzing trace with hash -401374632, now seen corresponding path program 1 times [2021-11-12 23:27:36,902 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 23:27:36,902 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [827380754] [2021-11-12 23:27:36,903 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:27:36,903 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 23:27:37,080 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-12 23:27:37,080 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [14773720] [2021-11-12 23:27:37,081 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:27:37,081 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 23:27:37,081 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_90b0c209-26ec-43c3-9ca9-e3e408617533/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 23:27:37,082 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_90b0c209-26ec-43c3-9ca9-e3e408617533/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 23:27:37,100 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_90b0c209-26ec-43c3-9ca9-e3e408617533/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-12 23:27:38,194 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:27:38,212 INFO L263 TraceCheckSpWp]: Trace formula consists of 3670 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-12 23:27:38,228 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:27:40,408 INFO L134 CoverageAnalysis]: Checked inductivity of 43941 backedges. 863 proven. 0 refuted. 0 times theorem prover too weak. 43078 trivial. 0 not checked. [2021-11-12 23:27:40,408 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:27:43,615 INFO L134 CoverageAnalysis]: Checked inductivity of 43941 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 43941 trivial. 0 not checked. [2021-11-12 23:27:43,615 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 23:27:43,615 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [827380754] [2021-11-12 23:27:43,615 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-12 23:27:43,616 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [14773720] [2021-11-12 23:27:43,616 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [14773720] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-12 23:27:43,616 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-12 23:27:43,616 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5, 6] imperfect sequences [] total 8 [2021-11-12 23:27:43,616 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1310284214] [2021-11-12 23:27:43,616 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-12 23:27:43,618 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-12 23:27:43,618 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 23:27:43,618 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-12 23:27:43,619 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2021-11-12 23:27:43,619 INFO L87 Difference]: Start difference. First operand 8420 states and 12532 transitions. Second operand has 8 states, 8 states have (on average 49.125) internal successors, (393), 8 states have internal predecessors, (393), 3 states have call successors, (242), 3 states have call predecessors, (242), 4 states have return successors, (241), 3 states have call predecessors, (241), 3 states have call successors, (241) [2021-11-12 23:27:45,653 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.03s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-12 23:27:47,805 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.05s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-12 23:28:43,612 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:28:43,612 INFO L93 Difference]: Finished difference Result 13918 states and 20748 transitions. [2021-11-12 23:28:43,614 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-12 23:28:43,615 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 49.125) internal successors, (393), 8 states have internal predecessors, (393), 3 states have call successors, (242), 3 states have call predecessors, (242), 4 states have return successors, (241), 3 states have call predecessors, (241), 3 states have call successors, (241) Word has length 1042 [2021-11-12 23:28:43,616 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:28:43,640 INFO L225 Difference]: With dead ends: 13918 [2021-11-12 23:28:43,640 INFO L226 Difference]: Without dead ends: 8187 [2021-11-12 23:28:43,651 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2084 GetRequests, 2076 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=30, Invalid=60, Unknown=0, NotChecked=0, Total=90 [2021-11-12 23:28:43,651 INFO L933 BasicCegarLoop]: 6128 mSDtfsCounter, 5573 mSDsluCounter, 11098 mSDsCounter, 0 mSdLazyCounter, 7563 mSolverCounterSat, 783 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 46479.22ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 5576 SdHoareTripleChecker+Valid, 17045 SdHoareTripleChecker+Invalid, 8348 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 64.79ms SdHoareTripleChecker+Time, 783 IncrementalHoareTripleChecker+Valid, 7563 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 59120.01ms IncrementalHoareTripleChecker+Time [2021-11-12 23:28:43,652 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5576 Valid, 17045 Invalid, 8348 Unknown, 0 Unchecked, 64.79ms Time], IncrementalHoareTripleChecker [783 Valid, 7563 Invalid, 2 Unknown, 0 Unchecked, 59120.01ms Time] [2021-11-12 23:28:43,660 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8187 states. [2021-11-12 23:28:45,341 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8187 to 8145. [2021-11-12 23:28:45,346 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 8145 states, 4999 states have (on average 1.2182436487297459) internal successors, (6090), 5027 states have internal predecessors, (6090), 3001 states have call successors, (3001), 136 states have call predecessors, (3001), 144 states have return successors, (3032), 2986 states have call predecessors, (3032), 2999 states have call successors, (3032) [2021-11-12 23:28:45,370 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8145 states to 8145 states and 12123 transitions. [2021-11-12 23:28:45,372 INFO L78 Accepts]: Start accepts. Automaton has 8145 states and 12123 transitions. Word has length 1042 [2021-11-12 23:28:45,373 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:28:45,373 INFO L470 AbstractCegarLoop]: Abstraction has 8145 states and 12123 transitions. [2021-11-12 23:28:45,374 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 49.125) internal successors, (393), 8 states have internal predecessors, (393), 3 states have call successors, (242), 3 states have call predecessors, (242), 4 states have return successors, (241), 3 states have call predecessors, (241), 3 states have call successors, (241) [2021-11-12 23:28:45,374 INFO L276 IsEmpty]: Start isEmpty. Operand 8145 states and 12123 transitions. [2021-11-12 23:28:45,390 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1046 [2021-11-12 23:28:45,390 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:28:45,390 INFO L514 BasicCegarLoop]: trace histogram [210, 6, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 23:28:45,416 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_90b0c209-26ec-43c3-9ca9-e3e408617533/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Ended with exit code 0 [2021-11-12 23:28:45,591 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_90b0c209-26ec-43c3-9ca9-e3e408617533/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable20 [2021-11-12 23:28:45,591 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:28:45,591 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:28:45,592 INFO L85 PathProgramCache]: Analyzing trace with hash 653479267, now seen corresponding path program 1 times [2021-11-12 23:28:45,592 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 23:28:45,592 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1030719389] [2021-11-12 23:28:45,592 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:28:45,592 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 23:28:45,782 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-12 23:28:45,782 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1196859722] [2021-11-12 23:28:45,783 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:28:45,783 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 23:28:45,783 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_90b0c209-26ec-43c3-9ca9-e3e408617533/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 23:28:45,784 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_90b0c209-26ec-43c3-9ca9-e3e408617533/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 23:28:45,801 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_90b0c209-26ec-43c3-9ca9-e3e408617533/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-12 23:28:46,829 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:28:46,847 INFO L263 TraceCheckSpWp]: Trace formula consists of 3678 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-12 23:28:46,865 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:28:49,193 INFO L134 CoverageAnalysis]: Checked inductivity of 43932 backedges. 858 proven. 0 refuted. 0 times theorem prover too weak. 43074 trivial. 0 not checked. [2021-11-12 23:28:49,194 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:28:52,261 INFO L134 CoverageAnalysis]: Checked inductivity of 43932 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 43932 trivial. 0 not checked. [2021-11-12 23:28:52,261 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 23:28:52,261 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1030719389] [2021-11-12 23:28:52,262 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-12 23:28:52,262 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1196859722] [2021-11-12 23:28:52,262 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1196859722] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-12 23:28:52,262 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-12 23:28:52,262 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5, 6] imperfect sequences [] total 8 [2021-11-12 23:28:52,263 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1011484091] [2021-11-12 23:28:52,263 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-12 23:28:52,264 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-12 23:28:52,264 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 23:28:52,264 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-12 23:28:52,264 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2021-11-12 23:28:52,264 INFO L87 Difference]: Start difference. First operand 8145 states and 12123 transitions. Second operand has 8 states, 8 states have (on average 49.875) internal successors, (399), 8 states have internal predecessors, (399), 4 states have call successors, (246), 3 states have call predecessors, (246), 4 states have return successors, (245), 4 states have call predecessors, (245), 4 states have call successors, (245) [2021-11-12 23:28:54,281 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-12 23:28:56,422 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.04s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers []