./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/eca-rers2012/Problem03_label16.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_782f5664-dcd1-41a7-82bc-c49c046a2195/bin/utaipan-vmNK8stdcF/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_782f5664-dcd1-41a7-82bc-c49c046a2195/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_782f5664-dcd1-41a7-82bc-c49c046a2195/bin/utaipan-vmNK8stdcF/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_782f5664-dcd1-41a7-82bc-c49c046a2195/bin/utaipan-vmNK8stdcF/config/TaipanReach.xml -i ../../sv-benchmarks/c/eca-rers2012/Problem03_label16.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_782f5664-dcd1-41a7-82bc-c49c046a2195/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_782f5664-dcd1-41a7-82bc-c49c046a2195/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 b3ca7ac045e48d38881d30e6a93ef4c7dacfed0b5d9d8607f5d28bf43102d8b7 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-63182f1 [2021-11-12 23:43:20,127 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-12 23:43:20,130 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-12 23:43:20,183 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-12 23:43:20,184 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-12 23:43:20,188 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-12 23:43:20,190 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-12 23:43:20,193 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-12 23:43:20,196 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-12 23:43:20,201 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-12 23:43:20,202 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-12 23:43:20,204 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-12 23:43:20,205 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-12 23:43:20,207 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-12 23:43:20,209 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-12 23:43:20,214 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-12 23:43:20,215 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-12 23:43:20,216 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-12 23:43:20,218 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-12 23:43:20,226 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-12 23:43:20,228 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-12 23:43:20,230 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-12 23:43:20,233 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-12 23:43:20,234 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-12 23:43:20,243 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-12 23:43:20,243 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-12 23:43:20,244 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-12 23:43:20,246 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-12 23:43:20,248 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-12 23:43:20,249 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-12 23:43:20,249 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-12 23:43:20,250 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-12 23:43:20,252 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-12 23:43:20,253 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-12 23:43:20,255 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-12 23:43:20,255 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-12 23:43:20,256 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-12 23:43:20,256 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-12 23:43:20,256 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-12 23:43:20,257 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-12 23:43:20,258 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-12 23:43:20,259 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_782f5664-dcd1-41a7-82bc-c49c046a2195/bin/utaipan-vmNK8stdcF/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-12 23:43:20,302 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-12 23:43:20,302 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-12 23:43:20,303 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-12 23:43:20,304 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-12 23:43:20,304 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-12 23:43:20,304 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-12 23:43:20,310 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-12 23:43:20,311 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-12 23:43:20,311 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-12 23:43:20,311 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-12 23:43:20,312 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-12 23:43:20,312 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-12 23:43:20,313 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-12 23:43:20,313 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-12 23:43:20,313 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-12 23:43:20,313 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2021-11-12 23:43:20,314 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-12 23:43:20,314 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-12 23:43:20,314 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-12 23:43:20,315 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-12 23:43:20,315 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-12 23:43:20,315 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-12 23:43:20,315 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-12 23:43:20,315 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-12 23:43:20,315 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-12 23:43:20,316 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-12 23:43:20,316 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-12 23:43:20,316 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-12 23:43:20,316 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-12 23:43:20,318 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-12 23:43:20,318 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-12 23:43:20,318 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-12 23:43:20,318 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-12 23:43:20,319 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-12 23:43:20,319 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-12 23:43:20,319 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-12 23:43:20,319 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-12 23:43:20,319 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-12 23:43:20,320 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-12 23:43:20,320 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-12 23:43:20,320 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_782f5664-dcd1-41a7-82bc-c49c046a2195/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_782f5664-dcd1-41a7-82bc-c49c046a2195/bin/utaipan-vmNK8stdcF Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> b3ca7ac045e48d38881d30e6a93ef4c7dacfed0b5d9d8607f5d28bf43102d8b7 [2021-11-12 23:43:20,630 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-12 23:43:20,657 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-12 23:43:20,660 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-12 23:43:20,661 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-12 23:43:20,662 INFO L275 PluginConnector]: CDTParser initialized [2021-11-12 23:43:20,664 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_782f5664-dcd1-41a7-82bc-c49c046a2195/bin/utaipan-vmNK8stdcF/../../sv-benchmarks/c/eca-rers2012/Problem03_label16.c [2021-11-12 23:43:20,733 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_782f5664-dcd1-41a7-82bc-c49c046a2195/bin/utaipan-vmNK8stdcF/data/5627da19c/0b5ab98c1a804b689e00286c23fcfd43/FLAG1be650a59 [2021-11-12 23:43:21,371 INFO L306 CDTParser]: Found 1 translation units. [2021-11-12 23:43:21,371 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_782f5664-dcd1-41a7-82bc-c49c046a2195/sv-benchmarks/c/eca-rers2012/Problem03_label16.c [2021-11-12 23:43:21,388 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_782f5664-dcd1-41a7-82bc-c49c046a2195/bin/utaipan-vmNK8stdcF/data/5627da19c/0b5ab98c1a804b689e00286c23fcfd43/FLAG1be650a59 [2021-11-12 23:43:21,550 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_782f5664-dcd1-41a7-82bc-c49c046a2195/bin/utaipan-vmNK8stdcF/data/5627da19c/0b5ab98c1a804b689e00286c23fcfd43 [2021-11-12 23:43:21,553 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-12 23:43:21,555 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-12 23:43:21,559 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-12 23:43:21,560 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-12 23:43:21,563 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-12 23:43:21,564 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 12.11 11:43:21" (1/1) ... [2021-11-12 23:43:21,565 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@38e550f4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 11:43:21, skipping insertion in model container [2021-11-12 23:43:21,566 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 12.11 11:43:21" (1/1) ... [2021-11-12 23:43:21,573 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-12 23:43:21,683 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-12 23:43:22,347 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_782f5664-dcd1-41a7-82bc-c49c046a2195/sv-benchmarks/c/eca-rers2012/Problem03_label16.c[56490,56503] [2021-11-12 23:43:22,378 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-12 23:43:22,389 INFO L203 MainTranslator]: Completed pre-run [2021-11-12 23:43:22,665 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_782f5664-dcd1-41a7-82bc-c49c046a2195/sv-benchmarks/c/eca-rers2012/Problem03_label16.c[56490,56503] [2021-11-12 23:43:22,682 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-12 23:43:22,701 INFO L208 MainTranslator]: Completed translation [2021-11-12 23:43:22,702 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 11:43:22 WrapperNode [2021-11-12 23:43:22,702 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-12 23:43:22,703 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-12 23:43:22,703 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-12 23:43:22,703 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-12 23:43:22,711 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 11:43:22" (1/1) ... [2021-11-12 23:43:22,759 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 11:43:22" (1/1) ... [2021-11-12 23:43:22,850 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-12 23:43:22,851 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-12 23:43:22,851 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-12 23:43:22,852 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-12 23:43:22,860 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 11:43:22" (1/1) ... [2021-11-12 23:43:22,861 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 11:43:22" (1/1) ... [2021-11-12 23:43:22,868 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 11:43:22" (1/1) ... [2021-11-12 23:43:22,868 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 11:43:22" (1/1) ... [2021-11-12 23:43:22,932 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 11:43:22" (1/1) ... [2021-11-12 23:43:22,956 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 11:43:22" (1/1) ... [2021-11-12 23:43:22,974 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 11:43:22" (1/1) ... [2021-11-12 23:43:22,989 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-12 23:43:22,992 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-12 23:43:22,993 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-12 23:43:22,993 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-12 23:43:22,994 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 11:43:22" (1/1) ... [2021-11-12 23:43:23,001 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-12 23:43:23,013 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_782f5664-dcd1-41a7-82bc-c49c046a2195/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 23:43:23,027 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_782f5664-dcd1-41a7-82bc-c49c046a2195/bin/utaipan-vmNK8stdcF/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-12 23:43:23,056 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_782f5664-dcd1-41a7-82bc-c49c046a2195/bin/utaipan-vmNK8stdcF/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-12 23:43:23,074 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-12 23:43:23,074 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-12 23:43:23,075 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-12 23:43:23,075 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-12 23:43:25,097 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-12 23:43:25,097 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2021-11-12 23:43:25,100 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 12.11 11:43:25 BoogieIcfgContainer [2021-11-12 23:43:25,100 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-12 23:43:25,102 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-12 23:43:25,102 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-12 23:43:25,105 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-12 23:43:25,105 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 12.11 11:43:21" (1/3) ... [2021-11-12 23:43:25,106 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6f2018fc and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 12.11 11:43:25, skipping insertion in model container [2021-11-12 23:43:25,106 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 11:43:22" (2/3) ... [2021-11-12 23:43:25,107 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6f2018fc and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 12.11 11:43:25, skipping insertion in model container [2021-11-12 23:43:25,107 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 12.11 11:43:25" (3/3) ... [2021-11-12 23:43:25,108 INFO L111 eAbstractionObserver]: Analyzing ICFG Problem03_label16.c [2021-11-12 23:43:25,113 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-12 23:43:25,114 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-12 23:43:25,160 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-12 23:43:25,167 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 23:43:25,167 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-12 23:43:25,185 INFO L276 IsEmpty]: Start isEmpty. Operand has 148 states, 146 states have (on average 1.9726027397260273) internal successors, (288), 147 states have internal predecessors, (288), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-12 23:43:25,198 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 144 [2021-11-12 23:43:25,198 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:43:25,199 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 23:43:25,200 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:43:25,205 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:43:25,205 INFO L85 PathProgramCache]: Analyzing trace with hash -1724864008, now seen corresponding path program 1 times [2021-11-12 23:43:25,214 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 23:43:25,215 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [636227946] [2021-11-12 23:43:25,216 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:43:25,216 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 23:43:25,461 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:43:25,688 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-12 23:43:25,689 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 23:43:25,689 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [636227946] [2021-11-12 23:43:25,690 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [636227946] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-12 23:43:25,690 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-12 23:43:25,691 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-12 23:43:25,692 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1140296526] [2021-11-12 23:43:25,693 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-12 23:43:25,698 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-12 23:43:25,698 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 23:43:25,723 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-12 23:43:25,724 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-12 23:43:25,727 INFO L87 Difference]: Start difference. First operand has 148 states, 146 states have (on average 1.9726027397260273) internal successors, (288), 147 states have internal predecessors, (288), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 3 states have (on average 47.666666666666664) internal successors, (143), 2 states have internal predecessors, (143), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-12 23:43:26,669 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:43:26,669 INFO L93 Difference]: Finished difference Result 440 states and 860 transitions. [2021-11-12 23:43:26,670 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-12 23:43:26,672 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 47.666666666666664) internal successors, (143), 2 states have internal predecessors, (143), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 143 [2021-11-12 23:43:26,673 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:43:26,686 INFO L225 Difference]: With dead ends: 440 [2021-11-12 23:43:26,686 INFO L226 Difference]: Without dead ends: 289 [2021-11-12 23:43:26,690 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 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 23:43:26,694 INFO L933 BasicCegarLoop]: 48 mSDtfsCounter, 30 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 459 mSolverCounterSat, 144 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 678.49ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 30 SdHoareTripleChecker+Valid, 53 SdHoareTripleChecker+Invalid, 603 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 12.57ms SdHoareTripleChecker+Time, 144 IncrementalHoareTripleChecker+Valid, 459 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 830.58ms IncrementalHoareTripleChecker+Time [2021-11-12 23:43:26,695 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [30 Valid, 53 Invalid, 603 Unknown, 0 Unchecked, 12.57ms Time], IncrementalHoareTripleChecker [144 Valid, 459 Invalid, 0 Unknown, 0 Unchecked, 830.58ms Time] [2021-11-12 23:43:26,713 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 289 states. [2021-11-12 23:43:26,747 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 289 to 289. [2021-11-12 23:43:26,749 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 289 states, 288 states have (on average 1.8090277777777777) internal successors, (521), 288 states have internal predecessors, (521), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-12 23:43:26,751 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 289 states to 289 states and 521 transitions. [2021-11-12 23:43:26,752 INFO L78 Accepts]: Start accepts. Automaton has 289 states and 521 transitions. Word has length 143 [2021-11-12 23:43:26,753 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:43:26,754 INFO L470 AbstractCegarLoop]: Abstraction has 289 states and 521 transitions. [2021-11-12 23:43:26,754 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 47.666666666666664) internal successors, (143), 2 states have internal predecessors, (143), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-12 23:43:26,754 INFO L276 IsEmpty]: Start isEmpty. Operand 289 states and 521 transitions. [2021-11-12 23:43:26,758 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 148 [2021-11-12 23:43:26,759 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:43:26,759 INFO L514 BasicCegarLoop]: trace histogram [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] [2021-11-12 23:43:26,759 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-12 23:43:26,760 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:43:26,760 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:43:26,761 INFO L85 PathProgramCache]: Analyzing trace with hash 1763838799, now seen corresponding path program 1 times [2021-11-12 23:43:26,761 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 23:43:26,761 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [727730519] [2021-11-12 23:43:26,762 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:43:26,762 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 23:43:26,795 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:43:26,887 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-12 23:43:26,888 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 23:43:26,888 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [727730519] [2021-11-12 23:43:26,888 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [727730519] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-12 23:43:26,889 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-12 23:43:26,889 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-12 23:43:26,889 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [283291567] [2021-11-12 23:43:26,889 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-12 23:43:26,891 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-12 23:43:26,891 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 23:43:26,892 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-12 23:43:26,892 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-12 23:43:26,892 INFO L87 Difference]: Start difference. First operand 289 states and 521 transitions. Second operand has 3 states, 3 states have (on average 49.0) internal successors, (147), 2 states have internal predecessors, (147), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-12 23:43:27,741 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:43:27,742 INFO L93 Difference]: Finished difference Result 865 states and 1561 transitions. [2021-11-12 23:43:27,742 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-12 23:43:27,742 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 49.0) internal successors, (147), 2 states have internal predecessors, (147), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 147 [2021-11-12 23:43:27,743 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:43:27,748 INFO L225 Difference]: With dead ends: 865 [2021-11-12 23:43:27,748 INFO L226 Difference]: Without dead ends: 577 [2021-11-12 23:43:27,757 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 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 23:43:27,759 INFO L933 BasicCegarLoop]: 53 mSDtfsCounter, 179 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 568 mSolverCounterSat, 20 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 695.00ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 179 SdHoareTripleChecker+Valid, 57 SdHoareTripleChecker+Invalid, 588 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 6.35ms SdHoareTripleChecker+Time, 20 IncrementalHoareTripleChecker+Valid, 568 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 815.68ms IncrementalHoareTripleChecker+Time [2021-11-12 23:43:27,760 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [179 Valid, 57 Invalid, 588 Unknown, 0 Unchecked, 6.35ms Time], IncrementalHoareTripleChecker [20 Valid, 568 Invalid, 0 Unknown, 0 Unchecked, 815.68ms Time] [2021-11-12 23:43:27,765 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 577 states. [2021-11-12 23:43:27,807 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 577 to 575. [2021-11-12 23:43:27,808 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 575 states, 574 states have (on average 1.7822299651567943) internal successors, (1023), 574 states have internal predecessors, (1023), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-12 23:43:27,811 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 575 states to 575 states and 1023 transitions. [2021-11-12 23:43:27,811 INFO L78 Accepts]: Start accepts. Automaton has 575 states and 1023 transitions. Word has length 147 [2021-11-12 23:43:27,811 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:43:27,811 INFO L470 AbstractCegarLoop]: Abstraction has 575 states and 1023 transitions. [2021-11-12 23:43:27,812 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 49.0) internal successors, (147), 2 states have internal predecessors, (147), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-12 23:43:27,812 INFO L276 IsEmpty]: Start isEmpty. Operand 575 states and 1023 transitions. [2021-11-12 23:43:27,827 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 155 [2021-11-12 23:43:27,829 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:43:27,830 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 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] [2021-11-12 23:43:27,830 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-12 23:43:27,830 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:43:27,831 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:43:27,832 INFO L85 PathProgramCache]: Analyzing trace with hash 1826151602, now seen corresponding path program 1 times [2021-11-12 23:43:27,833 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 23:43:27,833 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1134727308] [2021-11-12 23:43:27,834 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:43:27,837 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 23:43:27,894 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:43:27,988 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 10 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-12 23:43:27,988 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 23:43:27,989 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1134727308] [2021-11-12 23:43:27,989 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1134727308] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-12 23:43:27,989 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1025079057] [2021-11-12 23:43:27,990 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:43:27,990 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 23:43:27,990 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_782f5664-dcd1-41a7-82bc-c49c046a2195/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 23:43:27,992 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_782f5664-dcd1-41a7-82bc-c49c046a2195/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 23:43:28,011 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_782f5664-dcd1-41a7-82bc-c49c046a2195/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-12 23:43:28,147 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:43:28,151 INFO L263 TraceCheckSpWp]: Trace formula consists of 377 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-12 23:43:28,169 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:43:28,485 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 10 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-12 23:43:28,485 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:43:28,797 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 10 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-12 23:43:28,798 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1025079057] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-12 23:43:28,798 INFO L186 FreeRefinementEngine]: Found 2 perfect and 1 imperfect interpolant sequences. [2021-11-12 23:43:28,798 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2, 2] imperfect sequences [3] total 4 [2021-11-12 23:43:28,801 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [125824512] [2021-11-12 23:43:28,801 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-12 23:43:28,803 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-12 23:43:28,806 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 23:43:28,806 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-12 23:43:28,807 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-12 23:43:28,807 INFO L87 Difference]: Start difference. First operand 575 states and 1023 transitions. Second operand has 3 states, 3 states have (on average 50.666666666666664) internal successors, (152), 2 states have internal predecessors, (152), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-12 23:43:29,595 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:43:29,595 INFO L93 Difference]: Finished difference Result 1721 states and 3066 transitions. [2021-11-12 23:43:29,595 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-12 23:43:29,596 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 50.666666666666664) internal successors, (152), 2 states have internal predecessors, (152), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 154 [2021-11-12 23:43:29,596 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:43:29,603 INFO L225 Difference]: With dead ends: 1721 [2021-11-12 23:43:29,604 INFO L226 Difference]: Without dead ends: 1147 [2021-11-12 23:43:29,605 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 309 GetRequests, 305 SyntacticMatches, 1 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-12 23:43:29,606 INFO L933 BasicCegarLoop]: 67 mSDtfsCounter, 160 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 501 mSolverCounterSat, 87 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 628.74ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 160 SdHoareTripleChecker+Valid, 71 SdHoareTripleChecker+Invalid, 588 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 4.94ms SdHoareTripleChecker+Time, 87 IncrementalHoareTripleChecker+Valid, 501 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 750.04ms IncrementalHoareTripleChecker+Time [2021-11-12 23:43:29,606 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [160 Valid, 71 Invalid, 588 Unknown, 0 Unchecked, 4.94ms Time], IncrementalHoareTripleChecker [87 Valid, 501 Invalid, 0 Unknown, 0 Unchecked, 750.04ms Time] [2021-11-12 23:43:29,608 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1147 states. [2021-11-12 23:43:29,634 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1147 to 861. [2021-11-12 23:43:29,636 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 861 states, 860 states have (on average 1.7) internal successors, (1462), 860 states have internal predecessors, (1462), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-12 23:43:29,640 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 861 states to 861 states and 1462 transitions. [2021-11-12 23:43:29,640 INFO L78 Accepts]: Start accepts. Automaton has 861 states and 1462 transitions. Word has length 154 [2021-11-12 23:43:29,640 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:43:29,640 INFO L470 AbstractCegarLoop]: Abstraction has 861 states and 1462 transitions. [2021-11-12 23:43:29,641 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 50.666666666666664) internal successors, (152), 2 states have internal predecessors, (152), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-12 23:43:29,641 INFO L276 IsEmpty]: Start isEmpty. Operand 861 states and 1462 transitions. [2021-11-12 23:43:29,644 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 156 [2021-11-12 23:43:29,644 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:43:29,644 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 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] [2021-11-12 23:43:29,678 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_782f5664-dcd1-41a7-82bc-c49c046a2195/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-12 23:43:29,870 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_782f5664-dcd1-41a7-82bc-c49c046a2195/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2021-11-12 23:43:29,870 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:43:29,871 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:43:29,871 INFO L85 PathProgramCache]: Analyzing trace with hash -546834578, now seen corresponding path program 1 times [2021-11-12 23:43:29,871 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 23:43:29,871 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1115301533] [2021-11-12 23:43:29,871 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:43:29,872 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 23:43:29,906 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:43:29,956 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 10 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-12 23:43:29,956 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 23:43:29,956 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1115301533] [2021-11-12 23:43:29,956 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1115301533] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-12 23:43:29,957 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-12 23:43:29,957 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-12 23:43:29,957 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1735718900] [2021-11-12 23:43:29,957 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-12 23:43:29,958 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-12 23:43:29,958 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 23:43:29,959 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-12 23:43:29,959 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-12 23:43:29,959 INFO L87 Difference]: Start difference. First operand 861 states and 1462 transitions. Second operand has 3 states, 3 states have (on average 50.666666666666664) internal successors, (152), 2 states have internal predecessors, (152), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-12 23:43:30,736 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:43:30,736 INFO L93 Difference]: Finished difference Result 2579 states and 4383 transitions. [2021-11-12 23:43:30,738 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-12 23:43:30,738 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 50.666666666666664) internal successors, (152), 2 states have internal predecessors, (152), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 155 [2021-11-12 23:43:30,738 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:43:30,748 INFO L225 Difference]: With dead ends: 2579 [2021-11-12 23:43:30,748 INFO L226 Difference]: Without dead ends: 1719 [2021-11-12 23:43:30,750 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 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 23:43:30,751 INFO L933 BasicCegarLoop]: 42 mSDtfsCounter, 148 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 458 mSolverCounterSat, 166 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 579.70ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 148 SdHoareTripleChecker+Valid, 45 SdHoareTripleChecker+Invalid, 624 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 4.15ms SdHoareTripleChecker+Time, 166 IncrementalHoareTripleChecker+Valid, 458 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 722.71ms IncrementalHoareTripleChecker+Time [2021-11-12 23:43:30,751 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [148 Valid, 45 Invalid, 624 Unknown, 0 Unchecked, 4.15ms Time], IncrementalHoareTripleChecker [166 Valid, 458 Invalid, 0 Unknown, 0 Unchecked, 722.71ms Time] [2021-11-12 23:43:30,754 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1719 states. [2021-11-12 23:43:30,793 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1719 to 1719. [2021-11-12 23:43:30,796 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1719 states, 1718 states have (on average 1.6536670547147847) internal successors, (2841), 1718 states have internal predecessors, (2841), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-12 23:43:30,804 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1719 states to 1719 states and 2841 transitions. [2021-11-12 23:43:30,805 INFO L78 Accepts]: Start accepts. Automaton has 1719 states and 2841 transitions. Word has length 155 [2021-11-12 23:43:30,805 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:43:30,805 INFO L470 AbstractCegarLoop]: Abstraction has 1719 states and 2841 transitions. [2021-11-12 23:43:30,805 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 50.666666666666664) internal successors, (152), 2 states have internal predecessors, (152), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-12 23:43:30,806 INFO L276 IsEmpty]: Start isEmpty. Operand 1719 states and 2841 transitions. [2021-11-12 23:43:30,810 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 163 [2021-11-12 23:43:30,810 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:43:30,811 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 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] [2021-11-12 23:43:30,811 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-11-12 23:43:30,811 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:43:30,812 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:43:30,812 INFO L85 PathProgramCache]: Analyzing trace with hash 37008849, now seen corresponding path program 1 times [2021-11-12 23:43:30,812 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 23:43:30,812 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [793421596] [2021-11-12 23:43:30,813 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:43:30,813 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 23:43:30,842 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:43:30,920 INFO L134 CoverageAnalysis]: Checked inductivity of 31 backedges. 25 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-12 23:43:30,921 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 23:43:30,921 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [793421596] [2021-11-12 23:43:30,921 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [793421596] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-12 23:43:30,921 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-12 23:43:30,921 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-12 23:43:30,921 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2097115916] [2021-11-12 23:43:30,922 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-12 23:43:30,922 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-12 23:43:30,922 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 23:43:30,923 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-12 23:43:30,923 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-12 23:43:30,923 INFO L87 Difference]: Start difference. First operand 1719 states and 2841 transitions. Second operand has 3 states, 3 states have (on average 52.333333333333336) internal successors, (157), 3 states have internal predecessors, (157), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-12 23:43:31,740 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:43:31,740 INFO L93 Difference]: Finished difference Result 5153 states and 8520 transitions. [2021-11-12 23:43:31,745 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-12 23:43:31,746 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 52.333333333333336) internal successors, (157), 3 states have internal predecessors, (157), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 162 [2021-11-12 23:43:31,746 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:43:31,764 INFO L225 Difference]: With dead ends: 5153 [2021-11-12 23:43:31,765 INFO L226 Difference]: Without dead ends: 3435 [2021-11-12 23:43:31,768 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 23:43:31,769 INFO L933 BasicCegarLoop]: 259 mSDtfsCounter, 142 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 471 mSolverCounterSat, 133 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 607.37ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 142 SdHoareTripleChecker+Valid, 263 SdHoareTripleChecker+Invalid, 604 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 4.96ms SdHoareTripleChecker+Time, 133 IncrementalHoareTripleChecker+Valid, 471 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 732.60ms IncrementalHoareTripleChecker+Time [2021-11-12 23:43:31,769 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [142 Valid, 263 Invalid, 604 Unknown, 0 Unchecked, 4.96ms Time], IncrementalHoareTripleChecker [133 Valid, 471 Invalid, 0 Unknown, 0 Unchecked, 732.60ms Time] [2021-11-12 23:43:31,774 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3435 states. [2021-11-12 23:43:31,844 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3435 to 3435. [2021-11-12 23:43:31,851 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3435 states, 3434 states have (on average 1.4953407105416423) internal successors, (5135), 3434 states have internal predecessors, (5135), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-12 23:43:31,865 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3435 states to 3435 states and 5135 transitions. [2021-11-12 23:43:31,866 INFO L78 Accepts]: Start accepts. Automaton has 3435 states and 5135 transitions. Word has length 162 [2021-11-12 23:43:31,866 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:43:31,866 INFO L470 AbstractCegarLoop]: Abstraction has 3435 states and 5135 transitions. [2021-11-12 23:43:31,866 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 52.333333333333336) internal successors, (157), 3 states have internal predecessors, (157), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-12 23:43:31,866 INFO L276 IsEmpty]: Start isEmpty. Operand 3435 states and 5135 transitions. [2021-11-12 23:43:31,873 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 172 [2021-11-12 23:43:31,873 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:43:31,874 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 23:43:31,874 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-11-12 23:43:31,874 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:43:31,874 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:43:31,875 INFO L85 PathProgramCache]: Analyzing trace with hash -1836477602, now seen corresponding path program 1 times [2021-11-12 23:43:31,875 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 23:43:31,875 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [100204313] [2021-11-12 23:43:31,875 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:43:31,875 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 23:43:31,904 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:43:31,953 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 27 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-12 23:43:31,953 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 23:43:31,954 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [100204313] [2021-11-12 23:43:31,954 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [100204313] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-12 23:43:31,954 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-12 23:43:31,954 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-12 23:43:31,955 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1929994076] [2021-11-12 23:43:31,955 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-12 23:43:31,955 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-12 23:43:31,955 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 23:43:31,956 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-12 23:43:31,956 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-12 23:43:31,956 INFO L87 Difference]: Start difference. First operand 3435 states and 5135 transitions. Second operand has 3 states, 3 states have (on average 57.0) internal successors, (171), 2 states have internal predecessors, (171), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-12 23:43:32,793 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:43:32,794 INFO L93 Difference]: Finished difference Result 9874 states and 14828 transitions. [2021-11-12 23:43:32,794 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-12 23:43:32,794 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 57.0) internal successors, (171), 2 states have internal predecessors, (171), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 171 [2021-11-12 23:43:32,795 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:43:32,831 INFO L225 Difference]: With dead ends: 9874 [2021-11-12 23:43:32,831 INFO L226 Difference]: Without dead ends: 6440 [2021-11-12 23:43:32,836 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 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 23:43:32,840 INFO L933 BasicCegarLoop]: 68 mSDtfsCounter, 138 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 523 mSolverCounterSat, 89 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 626.84ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 138 SdHoareTripleChecker+Valid, 72 SdHoareTripleChecker+Invalid, 612 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 4.15ms SdHoareTripleChecker+Time, 89 IncrementalHoareTripleChecker+Valid, 523 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 744.96ms IncrementalHoareTripleChecker+Time [2021-11-12 23:43:32,841 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [138 Valid, 72 Invalid, 612 Unknown, 0 Unchecked, 4.15ms Time], IncrementalHoareTripleChecker [89 Valid, 523 Invalid, 0 Unknown, 0 Unchecked, 744.96ms Time] [2021-11-12 23:43:32,849 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6440 states. [2021-11-12 23:43:32,986 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6440 to 6438. [2021-11-12 23:43:33,000 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 6438 states, 6437 states have (on average 1.4520739474910673) internal successors, (9347), 6437 states have internal predecessors, (9347), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-12 23:43:33,018 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6438 states to 6438 states and 9347 transitions. [2021-11-12 23:43:33,018 INFO L78 Accepts]: Start accepts. Automaton has 6438 states and 9347 transitions. Word has length 171 [2021-11-12 23:43:33,019 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:43:33,019 INFO L470 AbstractCegarLoop]: Abstraction has 6438 states and 9347 transitions. [2021-11-12 23:43:33,019 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 57.0) internal successors, (171), 2 states have internal predecessors, (171), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-12 23:43:33,020 INFO L276 IsEmpty]: Start isEmpty. Operand 6438 states and 9347 transitions. [2021-11-12 23:43:33,033 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 188 [2021-11-12 23:43:33,033 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:43:33,033 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 23:43:33,033 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-11-12 23:43:33,034 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:43:33,034 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:43:33,034 INFO L85 PathProgramCache]: Analyzing trace with hash -156868154, now seen corresponding path program 1 times [2021-11-12 23:43:33,034 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 23:43:33,034 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [776042227] [2021-11-12 23:43:33,035 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:43:33,035 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 23:43:33,072 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:43:33,116 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 34 proven. 0 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-11-12 23:43:33,117 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 23:43:33,117 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [776042227] [2021-11-12 23:43:33,117 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [776042227] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-12 23:43:33,117 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-12 23:43:33,118 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-12 23:43:33,118 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [667946557] [2021-11-12 23:43:33,120 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-12 23:43:33,120 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-12 23:43:33,120 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 23:43:33,121 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-12 23:43:33,121 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-12 23:43:33,121 INFO L87 Difference]: Start difference. First operand 6438 states and 9347 transitions. Second operand has 3 states, 3 states have (on average 54.0) internal successors, (162), 2 states have internal predecessors, (162), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-12 23:43:33,985 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:43:33,985 INFO L93 Difference]: Finished difference Result 16879 states and 24866 transitions. [2021-11-12 23:43:33,986 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-12 23:43:33,986 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 54.0) internal successors, (162), 2 states have internal predecessors, (162), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 187 [2021-11-12 23:43:33,988 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:43:34,057 INFO L225 Difference]: With dead ends: 16879 [2021-11-12 23:43:34,057 INFO L226 Difference]: Without dead ends: 10442 [2021-11-12 23:43:34,065 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 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 23:43:34,066 INFO L933 BasicCegarLoop]: 100 mSDtfsCounter, 138 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 454 mSolverCounterSat, 123 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 648.54ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 138 SdHoareTripleChecker+Valid, 104 SdHoareTripleChecker+Invalid, 577 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 3.59ms SdHoareTripleChecker+Time, 123 IncrementalHoareTripleChecker+Valid, 454 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 761.33ms IncrementalHoareTripleChecker+Time [2021-11-12 23:43:34,067 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [138 Valid, 104 Invalid, 577 Unknown, 0 Unchecked, 3.59ms Time], IncrementalHoareTripleChecker [123 Valid, 454 Invalid, 0 Unknown, 0 Unchecked, 761.33ms Time] [2021-11-12 23:43:34,080 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10442 states. [2021-11-12 23:43:34,257 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10442 to 9155. [2021-11-12 23:43:34,275 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9155 states, 9154 states have (on average 1.355473017260214) internal successors, (12408), 9154 states have internal predecessors, (12408), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-12 23:43:34,296 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9155 states to 9155 states and 12408 transitions. [2021-11-12 23:43:34,297 INFO L78 Accepts]: Start accepts. Automaton has 9155 states and 12408 transitions. Word has length 187 [2021-11-12 23:43:34,297 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:43:34,297 INFO L470 AbstractCegarLoop]: Abstraction has 9155 states and 12408 transitions. [2021-11-12 23:43:34,298 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 54.0) internal successors, (162), 2 states have internal predecessors, (162), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-12 23:43:34,298 INFO L276 IsEmpty]: Start isEmpty. Operand 9155 states and 12408 transitions. [2021-11-12 23:43:34,312 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 198 [2021-11-12 23:43:34,312 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:43:34,313 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 4, 4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 23:43:34,313 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-11-12 23:43:34,313 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:43:34,313 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:43:34,314 INFO L85 PathProgramCache]: Analyzing trace with hash 1919440885, now seen corresponding path program 1 times [2021-11-12 23:43:34,314 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 23:43:34,314 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [765874059] [2021-11-12 23:43:34,314 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:43:34,315 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 23:43:34,351 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:43:34,400 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 68 proven. 0 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-12 23:43:34,400 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 23:43:34,400 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [765874059] [2021-11-12 23:43:34,400 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [765874059] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-12 23:43:34,401 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-12 23:43:34,401 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-12 23:43:34,401 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [482167967] [2021-11-12 23:43:34,401 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-12 23:43:34,402 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-12 23:43:34,402 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 23:43:34,402 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-12 23:43:34,402 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-12 23:43:34,403 INFO L87 Difference]: Start difference. First operand 9155 states and 12408 transitions. Second operand has 3 states, 3 states have (on average 55.666666666666664) internal successors, (167), 3 states have internal predecessors, (167), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-12 23:43:35,284 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:43:35,284 INFO L93 Difference]: Finished difference Result 21455 states and 29154 transitions. [2021-11-12 23:43:35,284 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-12 23:43:35,284 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 55.666666666666664) internal successors, (167), 3 states have internal predecessors, (167), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 197 [2021-11-12 23:43:35,285 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:43:35,324 INFO L225 Difference]: With dead ends: 21455 [2021-11-12 23:43:35,324 INFO L226 Difference]: Without dead ends: 12301 [2021-11-12 23:43:35,337 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 23:43:35,338 INFO L933 BasicCegarLoop]: 241 mSDtfsCounter, 132 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 442 mSolverCounterSat, 146 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 658.38ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 132 SdHoareTripleChecker+Valid, 245 SdHoareTripleChecker+Invalid, 588 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 3.99ms SdHoareTripleChecker+Time, 146 IncrementalHoareTripleChecker+Valid, 442 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 773.61ms IncrementalHoareTripleChecker+Time [2021-11-12 23:43:35,339 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [132 Valid, 245 Invalid, 588 Unknown, 0 Unchecked, 3.99ms Time], IncrementalHoareTripleChecker [146 Valid, 442 Invalid, 0 Unknown, 0 Unchecked, 773.61ms Time] [2021-11-12 23:43:35,355 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12301 states. [2021-11-12 23:43:35,533 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12301 to 12158. [2021-11-12 23:43:35,562 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 12158 states, 12157 states have (on average 1.3063255737435222) internal successors, (15881), 12157 states have internal predecessors, (15881), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-12 23:43:35,584 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12158 states to 12158 states and 15881 transitions. [2021-11-12 23:43:35,584 INFO L78 Accepts]: Start accepts. Automaton has 12158 states and 15881 transitions. Word has length 197 [2021-11-12 23:43:35,584 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:43:35,585 INFO L470 AbstractCegarLoop]: Abstraction has 12158 states and 15881 transitions. [2021-11-12 23:43:35,585 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 55.666666666666664) internal successors, (167), 3 states have internal predecessors, (167), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-12 23:43:35,586 INFO L276 IsEmpty]: Start isEmpty. Operand 12158 states and 15881 transitions. [2021-11-12 23:43:35,602 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 212 [2021-11-12 23:43:35,602 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:43:35,603 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 23:43:35,603 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-11-12 23:43:35,603 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:43:35,603 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:43:35,604 INFO L85 PathProgramCache]: Analyzing trace with hash -1211888839, now seen corresponding path program 1 times [2021-11-12 23:43:35,604 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 23:43:35,604 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [476438492] [2021-11-12 23:43:35,604 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:43:35,605 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 23:43:35,642 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:43:35,692 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 65 proven. 0 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-11-12 23:43:35,692 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 23:43:35,692 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [476438492] [2021-11-12 23:43:35,692 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [476438492] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-12 23:43:35,693 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-12 23:43:35,693 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-12 23:43:35,693 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1779130258] [2021-11-12 23:43:35,693 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-12 23:43:35,694 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-12 23:43:35,694 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 23:43:35,694 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-12 23:43:35,695 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-12 23:43:35,695 INFO L87 Difference]: Start difference. First operand 12158 states and 15881 transitions. Second operand has 3 states, 3 states have (on average 59.666666666666664) internal successors, (179), 2 states have internal predecessors, (179), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-12 23:43:36,627 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:43:36,627 INFO L93 Difference]: Finished difference Result 32754 states and 42881 transitions. [2021-11-12 23:43:36,628 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-12 23:43:36,628 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 59.666666666666664) internal successors, (179), 2 states have internal predecessors, (179), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 211 [2021-11-12 23:43:36,628 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:43:36,668 INFO L225 Difference]: With dead ends: 32754 [2021-11-12 23:43:36,668 INFO L226 Difference]: Without dead ends: 20883 [2021-11-12 23:43:36,689 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 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 23:43:36,691 INFO L933 BasicCegarLoop]: 104 mSDtfsCounter, 155 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 614 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 682.24ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 155 SdHoareTripleChecker+Valid, 108 SdHoareTripleChecker+Invalid, 635 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 3.97ms SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 614 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 799.57ms IncrementalHoareTripleChecker+Time [2021-11-12 23:43:36,692 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [155 Valid, 108 Invalid, 635 Unknown, 0 Unchecked, 3.97ms Time], IncrementalHoareTripleChecker [21 Valid, 614 Invalid, 0 Unknown, 0 Unchecked, 799.57ms Time] [2021-11-12 23:43:36,718 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20883 states. [2021-11-12 23:43:36,985 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20883 to 20881. [2021-11-12 23:43:37,009 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20881 states, 20880 states have (on average 1.2989463601532567) internal successors, (27122), 20880 states have internal predecessors, (27122), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-12 23:43:37,166 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20881 states to 20881 states and 27122 transitions. [2021-11-12 23:43:37,166 INFO L78 Accepts]: Start accepts. Automaton has 20881 states and 27122 transitions. Word has length 211 [2021-11-12 23:43:37,167 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:43:37,167 INFO L470 AbstractCegarLoop]: Abstraction has 20881 states and 27122 transitions. [2021-11-12 23:43:37,167 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 59.666666666666664) internal successors, (179), 2 states have internal predecessors, (179), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-12 23:43:37,167 INFO L276 IsEmpty]: Start isEmpty. Operand 20881 states and 27122 transitions. [2021-11-12 23:43:37,186 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 214 [2021-11-12 23:43:37,187 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:43:37,187 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 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] [2021-11-12 23:43:37,187 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-11-12 23:43:37,187 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:43:37,188 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:43:37,189 INFO L85 PathProgramCache]: Analyzing trace with hash -109257520, now seen corresponding path program 1 times [2021-11-12 23:43:37,189 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 23:43:37,189 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1944577787] [2021-11-12 23:43:37,189 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:43:37,189 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 23:43:37,236 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:43:37,291 INFO L134 CoverageAnalysis]: Checked inductivity of 119 backedges. 93 proven. 0 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-11-12 23:43:37,291 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 23:43:37,291 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1944577787] [2021-11-12 23:43:37,292 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1944577787] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-12 23:43:37,292 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-12 23:43:37,292 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-12 23:43:37,292 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2104821204] [2021-11-12 23:43:37,292 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-12 23:43:37,293 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-12 23:43:37,293 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 23:43:37,293 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-12 23:43:37,294 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-12 23:43:37,294 INFO L87 Difference]: Start difference. First operand 20881 states and 27122 transitions. Second operand has 4 states, 4 states have (on average 47.0) internal successors, (188), 3 states have internal predecessors, (188), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-12 23:43:38,682 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:43:38,682 INFO L93 Difference]: Finished difference Result 41189 states and 53587 transitions. [2021-11-12 23:43:38,683 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-12 23:43:38,683 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 47.0) internal successors, (188), 3 states have internal predecessors, (188), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 213 [2021-11-12 23:43:38,683 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:43:38,733 INFO L225 Difference]: With dead ends: 41189 [2021-11-12 23:43:38,734 INFO L226 Difference]: Without dead ends: 20881 [2021-11-12 23:43:38,759 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-12 23:43:38,759 INFO L933 BasicCegarLoop]: 91 mSDtfsCounter, 252 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 916 mSolverCounterSat, 154 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 941.60ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 252 SdHoareTripleChecker+Valid, 99 SdHoareTripleChecker+Invalid, 1070 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 5.87ms SdHoareTripleChecker+Time, 154 IncrementalHoareTripleChecker+Valid, 916 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1127.67ms IncrementalHoareTripleChecker+Time [2021-11-12 23:43:38,760 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [252 Valid, 99 Invalid, 1070 Unknown, 0 Unchecked, 5.87ms Time], IncrementalHoareTripleChecker [154 Valid, 916 Invalid, 0 Unknown, 0 Unchecked, 1127.67ms Time] [2021-11-12 23:43:38,789 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20881 states. [2021-11-12 23:43:39,164 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20881 to 20309. [2021-11-12 23:43:39,185 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20309 states, 20308 states have (on average 1.2989954697656096) internal successors, (26380), 20308 states have internal predecessors, (26380), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-12 23:43:39,218 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20309 states to 20309 states and 26380 transitions. [2021-11-12 23:43:39,218 INFO L78 Accepts]: Start accepts. Automaton has 20309 states and 26380 transitions. Word has length 213 [2021-11-12 23:43:39,219 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:43:39,219 INFO L470 AbstractCegarLoop]: Abstraction has 20309 states and 26380 transitions. [2021-11-12 23:43:39,219 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 47.0) internal successors, (188), 3 states have internal predecessors, (188), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-12 23:43:39,219 INFO L276 IsEmpty]: Start isEmpty. Operand 20309 states and 26380 transitions. [2021-11-12 23:43:39,239 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 221 [2021-11-12 23:43:39,239 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:43:39,240 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 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] [2021-11-12 23:43:39,240 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2021-11-12 23:43:39,240 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:43:39,250 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:43:39,250 INFO L85 PathProgramCache]: Analyzing trace with hash 697190771, now seen corresponding path program 1 times [2021-11-12 23:43:39,250 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 23:43:39,251 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1814407820] [2021-11-12 23:43:39,251 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:43:39,251 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 23:43:39,294 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:43:39,387 INFO L134 CoverageAnalysis]: Checked inductivity of 146 backedges. 88 proven. 6 refuted. 0 times theorem prover too weak. 52 trivial. 0 not checked. [2021-11-12 23:43:39,388 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 23:43:39,388 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1814407820] [2021-11-12 23:43:39,388 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1814407820] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-12 23:43:39,388 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [330846418] [2021-11-12 23:43:39,389 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:43:39,389 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 23:43:39,389 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_782f5664-dcd1-41a7-82bc-c49c046a2195/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 23:43:39,390 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_782f5664-dcd1-41a7-82bc-c49c046a2195/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 23:43:39,414 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_782f5664-dcd1-41a7-82bc-c49c046a2195/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-12 23:43:39,570 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:43:39,573 INFO L263 TraceCheckSpWp]: Trace formula consists of 542 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-12 23:43:39,586 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:43:40,032 INFO L134 CoverageAnalysis]: Checked inductivity of 146 backedges. 121 proven. 0 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-11-12 23:43:40,032 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:43:40,506 INFO L134 CoverageAnalysis]: Checked inductivity of 146 backedges. 121 proven. 0 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-11-12 23:43:40,506 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [330846418] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-12 23:43:40,506 INFO L186 FreeRefinementEngine]: Found 2 perfect and 1 imperfect interpolant sequences. [2021-11-12 23:43:40,507 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [3] total 5 [2021-11-12 23:43:40,507 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [533270067] [2021-11-12 23:43:40,507 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-12 23:43:40,508 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-12 23:43:40,508 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 23:43:40,509 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-12 23:43:40,509 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-12 23:43:40,510 INFO L87 Difference]: Start difference. First operand 20309 states and 26380 transitions. Second operand has 3 states, 3 states have (on average 67.66666666666667) internal successors, (203), 3 states have internal predecessors, (203), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-12 23:43:41,412 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:43:41,413 INFO L93 Difference]: Finished difference Result 41761 states and 54681 transitions. [2021-11-12 23:43:41,413 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-12 23:43:41,413 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 67.66666666666667) internal successors, (203), 3 states have internal predecessors, (203), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 220 [2021-11-12 23:43:41,414 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:43:41,459 INFO L225 Difference]: With dead ends: 41761 [2021-11-12 23:43:41,459 INFO L226 Difference]: Without dead ends: 21596 [2021-11-12 23:43:41,476 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 441 GetRequests, 437 SyntacticMatches, 1 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-12 23:43:41,477 INFO L933 BasicCegarLoop]: 201 mSDtfsCounter, 125 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 547 mSolverCounterSat, 75 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 634.96ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 125 SdHoareTripleChecker+Valid, 205 SdHoareTripleChecker+Invalid, 622 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 4.45ms SdHoareTripleChecker+Time, 75 IncrementalHoareTripleChecker+Valid, 547 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 752.48ms IncrementalHoareTripleChecker+Time [2021-11-12 23:43:41,477 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [125 Valid, 205 Invalid, 622 Unknown, 0 Unchecked, 4.45ms Time], IncrementalHoareTripleChecker [75 Valid, 547 Invalid, 0 Unknown, 0 Unchecked, 752.48ms Time] [2021-11-12 23:43:41,496 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21596 states. [2021-11-12 23:43:41,833 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21596 to 21596. [2021-11-12 23:43:41,854 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21596 states, 21595 states have (on average 1.2994211623060894) internal successors, (28061), 21595 states have internal predecessors, (28061), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-12 23:43:41,888 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21596 states to 21596 states and 28061 transitions. [2021-11-12 23:43:41,889 INFO L78 Accepts]: Start accepts. Automaton has 21596 states and 28061 transitions. Word has length 220 [2021-11-12 23:43:41,889 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:43:41,889 INFO L470 AbstractCegarLoop]: Abstraction has 21596 states and 28061 transitions. [2021-11-12 23:43:41,889 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 67.66666666666667) internal successors, (203), 3 states have internal predecessors, (203), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-12 23:43:41,890 INFO L276 IsEmpty]: Start isEmpty. Operand 21596 states and 28061 transitions. [2021-11-12 23:43:41,924 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 229 [2021-11-12 23:43:41,924 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:43:41,924 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 5, 5, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 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] [2021-11-12 23:43:41,960 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_782f5664-dcd1-41a7-82bc-c49c046a2195/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-12 23:43:42,138 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_782f5664-dcd1-41a7-82bc-c49c046a2195/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2021-11-12 23:43:42,138 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:43:42,139 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:43:42,139 INFO L85 PathProgramCache]: Analyzing trace with hash -1498107534, now seen corresponding path program 1 times [2021-11-12 23:43:42,139 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 23:43:42,139 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1580562549] [2021-11-12 23:43:42,139 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:43:42,139 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 23:43:42,187 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:43:42,252 INFO L134 CoverageAnalysis]: Checked inductivity of 179 backedges. 101 proven. 6 refuted. 0 times theorem prover too weak. 72 trivial. 0 not checked. [2021-11-12 23:43:42,252 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 23:43:42,252 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1580562549] [2021-11-12 23:43:42,252 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1580562549] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-12 23:43:42,252 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [885692833] [2021-11-12 23:43:42,253 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:43:42,253 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 23:43:42,253 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_782f5664-dcd1-41a7-82bc-c49c046a2195/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 23:43:42,254 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_782f5664-dcd1-41a7-82bc-c49c046a2195/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 23:43:42,274 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_782f5664-dcd1-41a7-82bc-c49c046a2195/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-12 23:43:42,422 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:43:42,424 INFO L263 TraceCheckSpWp]: Trace formula consists of 579 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-12 23:43:42,429 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:43:42,807 INFO L134 CoverageAnalysis]: Checked inductivity of 179 backedges. 148 proven. 0 refuted. 0 times theorem prover too weak. 31 trivial. 0 not checked. [2021-11-12 23:43:42,807 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:43:43,351 INFO L134 CoverageAnalysis]: Checked inductivity of 179 backedges. 148 proven. 0 refuted. 0 times theorem prover too weak. 31 trivial. 0 not checked. [2021-11-12 23:43:43,351 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [885692833] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-12 23:43:43,352 INFO L186 FreeRefinementEngine]: Found 2 perfect and 1 imperfect interpolant sequences. [2021-11-12 23:43:43,352 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [3] total 5 [2021-11-12 23:43:43,353 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1673689735] [2021-11-12 23:43:43,354 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-12 23:43:43,355 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-12 23:43:43,355 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 23:43:43,355 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-12 23:43:43,356 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-12 23:43:43,356 INFO L87 Difference]: Start difference. First operand 21596 states and 28061 transitions. Second operand has 3 states, 3 states have (on average 68.66666666666667) internal successors, (206), 3 states have internal predecessors, (206), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-12 23:43:43,890 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:43:43,891 INFO L93 Difference]: Finished difference Result 46768 states and 61538 transitions. [2021-11-12 23:43:43,891 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-12 23:43:43,891 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 68.66666666666667) internal successors, (206), 3 states have internal predecessors, (206), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 228 [2021-11-12 23:43:43,892 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:43:43,952 INFO L225 Difference]: With dead ends: 46768 [2021-11-12 23:43:43,953 INFO L226 Difference]: Without dead ends: 33753 [2021-11-12 23:43:43,966 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 457 GetRequests, 453 SyntacticMatches, 1 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-12 23:43:43,966 INFO L933 BasicCegarLoop]: 394 mSDtfsCounter, 208 mSDsluCounter, 167 mSDsCounter, 0 mSdLazyCounter, 215 mSolverCounterSat, 40 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 271.01ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 208 SdHoareTripleChecker+Valid, 555 SdHoareTripleChecker+Invalid, 255 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 4.31ms SdHoareTripleChecker+Time, 40 IncrementalHoareTripleChecker+Valid, 215 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 341.34ms IncrementalHoareTripleChecker+Time [2021-11-12 23:43:43,967 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [208 Valid, 555 Invalid, 255 Unknown, 0 Unchecked, 4.31ms Time], IncrementalHoareTripleChecker [40 Valid, 215 Invalid, 0 Unknown, 0 Unchecked, 341.34ms Time] [2021-11-12 23:43:44,000 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33753 states. [2021-11-12 23:43:44,522 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33753 to 33751. [2021-11-12 23:43:44,555 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33751 states, 33750 states have (on average 1.2871407407407407) internal successors, (43441), 33750 states have internal predecessors, (43441), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-12 23:43:44,611 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33751 states to 33751 states and 43441 transitions. [2021-11-12 23:43:44,611 INFO L78 Accepts]: Start accepts. Automaton has 33751 states and 43441 transitions. Word has length 228 [2021-11-12 23:43:44,612 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:43:44,612 INFO L470 AbstractCegarLoop]: Abstraction has 33751 states and 43441 transitions. [2021-11-12 23:43:44,612 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 68.66666666666667) internal successors, (206), 3 states have internal predecessors, (206), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-12 23:43:44,613 INFO L276 IsEmpty]: Start isEmpty. Operand 33751 states and 43441 transitions. [2021-11-12 23:43:44,643 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 229 [2021-11-12 23:43:44,643 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:43:44,644 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 23:43:44,682 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_782f5664-dcd1-41a7-82bc-c49c046a2195/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-12 23:43:44,870 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_782f5664-dcd1-41a7-82bc-c49c046a2195/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 23:43:44,870 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:43:44,871 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:43:44,871 INFO L85 PathProgramCache]: Analyzing trace with hash 1649008240, now seen corresponding path program 1 times [2021-11-12 23:43:44,871 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 23:43:44,871 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [889551643] [2021-11-12 23:43:44,871 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:43:44,871 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 23:43:44,928 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:43:44,997 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 82 proven. 0 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-11-12 23:43:44,997 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 23:43:44,998 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [889551643] [2021-11-12 23:43:44,998 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [889551643] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-12 23:43:44,998 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-12 23:43:44,998 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-12 23:43:45,000 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1057706847] [2021-11-12 23:43:45,001 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-12 23:43:45,002 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-12 23:43:45,002 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 23:43:45,002 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-12 23:43:45,002 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-12 23:43:45,003 INFO L87 Difference]: Start difference. First operand 33751 states and 43441 transitions. Second operand has 3 states, 3 states have (on average 73.33333333333333) internal successors, (220), 2 states have internal predecessors, (220), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-12 23:43:45,934 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:43:45,934 INFO L93 Difference]: Finished difference Result 66216 states and 85581 transitions. [2021-11-12 23:43:45,935 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-12 23:43:45,936 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 73.33333333333333) internal successors, (220), 2 states have internal predecessors, (220), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 228 [2021-11-12 23:43:45,936 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:43:45,989 INFO L225 Difference]: With dead ends: 66216 [2021-11-12 23:43:45,989 INFO L226 Difference]: Without dead ends: 41046 [2021-11-12 23:43:46,008 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 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 23:43:46,010 INFO L933 BasicCegarLoop]: 121 mSDtfsCounter, 86 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 636 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 586.78ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 86 SdHoareTripleChecker+Valid, 133 SdHoareTripleChecker+Invalid, 645 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 2.98ms SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 636 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 722.09ms IncrementalHoareTripleChecker+Time [2021-11-12 23:43:46,011 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [86 Valid, 133 Invalid, 645 Unknown, 0 Unchecked, 2.98ms Time], IncrementalHoareTripleChecker [9 Valid, 636 Invalid, 0 Unknown, 0 Unchecked, 722.09ms Time] [2021-11-12 23:43:46,054 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41046 states. [2021-11-12 23:43:46,518 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41046 to 41044. [2021-11-12 23:43:46,552 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41044 states, 41043 states have (on average 1.2885023024632702) internal successors, (52884), 41043 states have internal predecessors, (52884), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-12 23:43:46,879 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41044 states to 41044 states and 52884 transitions. [2021-11-12 23:43:46,894 INFO L78 Accepts]: Start accepts. Automaton has 41044 states and 52884 transitions. Word has length 228 [2021-11-12 23:43:46,894 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:43:46,894 INFO L470 AbstractCegarLoop]: Abstraction has 41044 states and 52884 transitions. [2021-11-12 23:43:46,894 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 73.33333333333333) internal successors, (220), 2 states have internal predecessors, (220), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-12 23:43:46,895 INFO L276 IsEmpty]: Start isEmpty. Operand 41044 states and 52884 transitions. [2021-11-12 23:43:46,922 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 230 [2021-11-12 23:43:46,922 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:43:46,923 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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] [2021-11-12 23:43:46,923 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2021-11-12 23:43:46,923 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:43:46,924 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:43:46,924 INFO L85 PathProgramCache]: Analyzing trace with hash -511086605, now seen corresponding path program 1 times [2021-11-12 23:43:46,924 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 23:43:46,924 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2072929269] [2021-11-12 23:43:46,925 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:43:46,925 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 23:43:46,979 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:43:47,060 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 99 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-12 23:43:47,060 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 23:43:47,060 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2072929269] [2021-11-12 23:43:47,060 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2072929269] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-12 23:43:47,061 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-12 23:43:47,061 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-12 23:43:47,061 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1971413541] [2021-11-12 23:43:47,061 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-12 23:43:47,062 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-12 23:43:47,062 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 23:43:47,062 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-12 23:43:47,062 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-12 23:43:47,063 INFO L87 Difference]: Start difference. First operand 41044 states and 52884 transitions. Second operand has 4 states, 4 states have (on average 56.0) internal successors, (224), 3 states have internal predecessors, (224), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-12 23:43:48,226 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:43:48,227 INFO L93 Difference]: Finished difference Result 79513 states and 102687 transitions. [2021-11-12 23:43:48,227 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-12 23:43:48,227 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 56.0) internal successors, (224), 3 states have internal predecessors, (224), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 229 [2021-11-12 23:43:48,228 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:43:48,421 INFO L225 Difference]: With dead ends: 79513 [2021-11-12 23:43:48,441 INFO L226 Difference]: Without dead ends: 39185 [2021-11-12 23:43:48,494 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-12 23:43:48,494 INFO L933 BasicCegarLoop]: 7 mSDtfsCounter, 246 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 648 mSolverCounterSat, 177 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 589.55ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 246 SdHoareTripleChecker+Valid, 11 SdHoareTripleChecker+Invalid, 825 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 3.44ms SdHoareTripleChecker+Time, 177 IncrementalHoareTripleChecker+Valid, 648 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 907.77ms IncrementalHoareTripleChecker+Time [2021-11-12 23:43:48,494 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [246 Valid, 11 Invalid, 825 Unknown, 0 Unchecked, 3.44ms Time], IncrementalHoareTripleChecker [177 Valid, 648 Invalid, 0 Unknown, 0 Unchecked, 907.77ms Time] [2021-11-12 23:43:48,524 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39185 states. [2021-11-12 23:43:48,944 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39185 to 39185. [2021-11-12 23:43:49,053 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39185 states, 39184 states have (on average 1.2328501429154757) internal successors, (48308), 39184 states have internal predecessors, (48308), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-12 23:43:49,112 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39185 states to 39185 states and 48308 transitions. [2021-11-12 23:43:49,112 INFO L78 Accepts]: Start accepts. Automaton has 39185 states and 48308 transitions. Word has length 229 [2021-11-12 23:43:49,113 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:43:49,113 INFO L470 AbstractCegarLoop]: Abstraction has 39185 states and 48308 transitions. [2021-11-12 23:43:49,113 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 56.0) internal successors, (224), 3 states have internal predecessors, (224), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-12 23:43:49,113 INFO L276 IsEmpty]: Start isEmpty. Operand 39185 states and 48308 transitions. [2021-11-12 23:43:49,133 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 244 [2021-11-12 23:43:49,133 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:43:49,134 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 23:43:49,134 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2021-11-12 23:43:49,134 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:43:49,135 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:43:49,135 INFO L85 PathProgramCache]: Analyzing trace with hash -817248172, now seen corresponding path program 1 times [2021-11-12 23:43:49,135 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 23:43:49,136 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [273483346] [2021-11-12 23:43:49,136 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:43:49,136 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 23:43:49,172 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:43:49,230 INFO L134 CoverageAnalysis]: Checked inductivity of 147 backedges. 98 proven. 0 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2021-11-12 23:43:49,230 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 23:43:49,230 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [273483346] [2021-11-12 23:43:49,231 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [273483346] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-12 23:43:49,231 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-12 23:43:49,231 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-12 23:43:49,231 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [670727970] [2021-11-12 23:43:49,231 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-12 23:43:49,232 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-12 23:43:49,232 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 23:43:49,232 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-12 23:43:49,233 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-12 23:43:49,233 INFO L87 Difference]: Start difference. First operand 39185 states and 48308 transitions. Second operand has 3 states, 3 states have (on average 65.0) internal successors, (195), 2 states have internal predecessors, (195), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-12 23:43:50,210 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:43:50,211 INFO L93 Difference]: Finished difference Result 94101 states and 116068 transitions. [2021-11-12 23:43:50,211 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-12 23:43:50,211 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 65.0) internal successors, (195), 2 states have internal predecessors, (195), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 243 [2021-11-12 23:43:50,212 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:43:50,278 INFO L225 Difference]: With dead ends: 94101 [2021-11-12 23:43:50,278 INFO L226 Difference]: Without dead ends: 55775 [2021-11-12 23:43:50,438 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 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 23:43:50,440 INFO L933 BasicCegarLoop]: 106 mSDtfsCounter, 131 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 581 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 595.94ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 131 SdHoareTripleChecker+Valid, 110 SdHoareTripleChecker+Invalid, 602 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 2.95ms SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 581 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 696.39ms IncrementalHoareTripleChecker+Time [2021-11-12 23:43:50,441 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [131 Valid, 110 Invalid, 602 Unknown, 0 Unchecked, 2.95ms Time], IncrementalHoareTripleChecker [21 Valid, 581 Invalid, 0 Unknown, 0 Unchecked, 696.39ms Time] [2021-11-12 23:43:50,486 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55775 states. [2021-11-12 23:43:51,132 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55775 to 55773. [2021-11-12 23:43:51,162 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55773 states, 55772 states have (on average 1.2273721580721508) internal successors, (68453), 55772 states have internal predecessors, (68453), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-12 23:43:51,234 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55773 states to 55773 states and 68453 transitions. [2021-11-12 23:43:51,235 INFO L78 Accepts]: Start accepts. Automaton has 55773 states and 68453 transitions. Word has length 243 [2021-11-12 23:43:51,235 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:43:51,235 INFO L470 AbstractCegarLoop]: Abstraction has 55773 states and 68453 transitions. [2021-11-12 23:43:51,235 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 65.0) internal successors, (195), 2 states have internal predecessors, (195), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-12 23:43:51,235 INFO L276 IsEmpty]: Start isEmpty. Operand 55773 states and 68453 transitions. [2021-11-12 23:43:51,258 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 250 [2021-11-12 23:43:51,258 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:43:51,259 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 23:43:51,259 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2021-11-12 23:43:51,259 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:43:51,259 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:43:51,260 INFO L85 PathProgramCache]: Analyzing trace with hash 1061541960, now seen corresponding path program 1 times [2021-11-12 23:43:51,260 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 23:43:51,260 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1520867405] [2021-11-12 23:43:51,260 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:43:51,260 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 23:43:51,311 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:43:51,407 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 108 proven. 3 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-12 23:43:51,407 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 23:43:51,407 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1520867405] [2021-11-12 23:43:51,407 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1520867405] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-12 23:43:51,408 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1473880648] [2021-11-12 23:43:51,408 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:43:51,408 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 23:43:51,408 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_782f5664-dcd1-41a7-82bc-c49c046a2195/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 23:43:51,414 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_782f5664-dcd1-41a7-82bc-c49c046a2195/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 23:43:51,430 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_782f5664-dcd1-41a7-82bc-c49c046a2195/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-12 23:43:51,584 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:43:51,587 INFO L263 TraceCheckSpWp]: Trace formula consists of 518 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-12 23:43:51,592 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:43:52,220 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 103 proven. 0 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-11-12 23:43:52,221 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:43:52,648 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 103 proven. 0 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-11-12 23:43:52,649 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1473880648] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-12 23:43:52,649 INFO L186 FreeRefinementEngine]: Found 2 perfect and 1 imperfect interpolant sequences. [2021-11-12 23:43:52,649 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [3] total 6 [2021-11-12 23:43:52,649 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [802155232] [2021-11-12 23:43:52,649 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-12 23:43:52,650 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-12 23:43:52,651 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 23:43:52,651 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-12 23:43:52,651 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-12 23:43:52,652 INFO L87 Difference]: Start difference. First operand 55773 states and 68453 transitions. Second operand has 4 states, 4 states have (on average 96.5) internal successors, (386), 4 states have internal predecessors, (386), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-12 23:43:53,917 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:43:53,917 INFO L93 Difference]: Finished difference Result 124272 states and 155131 transitions. [2021-11-12 23:43:53,918 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-12 23:43:53,918 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 96.5) internal successors, (386), 4 states have internal predecessors, (386), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 249 [2021-11-12 23:43:53,919 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:43:54,197 INFO L225 Difference]: With dead ends: 124272 [2021-11-12 23:43:54,197 INFO L226 Difference]: Without dead ends: 72504 [2021-11-12 23:43:54,215 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 499 GetRequests, 495 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-12 23:43:54,216 INFO L933 BasicCegarLoop]: 66 mSDtfsCounter, 31 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 937 mSolverCounterSat, 85 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 670.53ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 31 SdHoareTripleChecker+Valid, 74 SdHoareTripleChecker+Invalid, 1022 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 4.69ms SdHoareTripleChecker+Time, 85 IncrementalHoareTripleChecker+Valid, 937 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 834.12ms IncrementalHoareTripleChecker+Time [2021-11-12 23:43:54,216 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [31 Valid, 74 Invalid, 1022 Unknown, 0 Unchecked, 4.69ms Time], IncrementalHoareTripleChecker [85 Valid, 937 Invalid, 0 Unknown, 0 Unchecked, 834.12ms Time] [2021-11-12 23:43:54,263 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72504 states. [2021-11-12 23:43:54,999 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72504 to 69787. [2021-11-12 23:43:55,045 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 69787 states, 69786 states have (on average 1.2490327572865618) internal successors, (87165), 69786 states have internal predecessors, (87165), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-12 23:43:55,131 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69787 states to 69787 states and 87165 transitions. [2021-11-12 23:43:55,131 INFO L78 Accepts]: Start accepts. Automaton has 69787 states and 87165 transitions. Word has length 249 [2021-11-12 23:43:55,132 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:43:55,132 INFO L470 AbstractCegarLoop]: Abstraction has 69787 states and 87165 transitions. [2021-11-12 23:43:55,132 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 96.5) internal successors, (386), 4 states have internal predecessors, (386), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-12 23:43:55,132 INFO L276 IsEmpty]: Start isEmpty. Operand 69787 states and 87165 transitions. [2021-11-12 23:43:55,427 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 266 [2021-11-12 23:43:55,427 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:43:55,427 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 23:43:55,485 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_782f5664-dcd1-41a7-82bc-c49c046a2195/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-12 23:43:55,628 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_782f5664-dcd1-41a7-82bc-c49c046a2195/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 23:43:55,628 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:43:55,628 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:43:55,629 INFO L85 PathProgramCache]: Analyzing trace with hash 1601074587, now seen corresponding path program 1 times [2021-11-12 23:43:55,629 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 23:43:55,629 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [739910951] [2021-11-12 23:43:55,629 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:43:55,629 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 23:43:55,679 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:43:55,751 INFO L134 CoverageAnalysis]: Checked inductivity of 230 backedges. 110 proven. 6 refuted. 0 times theorem prover too weak. 114 trivial. 0 not checked. [2021-11-12 23:43:55,751 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 23:43:55,751 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [739910951] [2021-11-12 23:43:55,751 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [739910951] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-12 23:43:55,751 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [331164628] [2021-11-12 23:43:55,752 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:43:55,752 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 23:43:55,752 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_782f5664-dcd1-41a7-82bc-c49c046a2195/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 23:43:55,753 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_782f5664-dcd1-41a7-82bc-c49c046a2195/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 23:43:55,773 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_782f5664-dcd1-41a7-82bc-c49c046a2195/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-12 23:43:55,920 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:43:55,923 INFO L263 TraceCheckSpWp]: Trace formula consists of 575 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-12 23:43:55,934 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:43:56,405 INFO L134 CoverageAnalysis]: Checked inductivity of 230 backedges. 157 proven. 0 refuted. 0 times theorem prover too weak. 73 trivial. 0 not checked. [2021-11-12 23:43:56,405 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:43:56,847 INFO L134 CoverageAnalysis]: Checked inductivity of 230 backedges. 157 proven. 0 refuted. 0 times theorem prover too weak. 73 trivial. 0 not checked. [2021-11-12 23:43:56,847 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [331164628] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-12 23:43:56,847 INFO L186 FreeRefinementEngine]: Found 2 perfect and 1 imperfect interpolant sequences. [2021-11-12 23:43:56,848 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [3] total 5 [2021-11-12 23:43:56,848 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [98245590] [2021-11-12 23:43:56,848 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-12 23:43:56,849 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-12 23:43:56,849 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 23:43:56,849 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-12 23:43:56,849 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-12 23:43:56,850 INFO L87 Difference]: Start difference. First operand 69787 states and 87165 transitions. Second operand has 3 states, 3 states have (on average 67.0) internal successors, (201), 3 states have internal predecessors, (201), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-12 23:43:57,917 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:43:57,917 INFO L93 Difference]: Finished difference Result 152729 states and 191969 transitions. [2021-11-12 23:43:57,917 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-12 23:43:57,917 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 67.0) internal successors, (201), 3 states have internal predecessors, (201), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 265 [2021-11-12 23:43:57,918 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:43:58,017 INFO L225 Difference]: With dead ends: 152729 [2021-11-12 23:43:58,018 INFO L226 Difference]: Without dead ends: 83801 [2021-11-12 23:43:58,048 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 531 GetRequests, 527 SyntacticMatches, 1 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-12 23:43:58,049 INFO L933 BasicCegarLoop]: 64 mSDtfsCounter, 33 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 478 mSolverCounterSat, 71 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 398.96ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 33 SdHoareTripleChecker+Valid, 68 SdHoareTripleChecker+Invalid, 549 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 2.27ms SdHoareTripleChecker+Time, 71 IncrementalHoareTripleChecker+Valid, 478 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 487.03ms IncrementalHoareTripleChecker+Time [2021-11-12 23:43:58,049 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [33 Valid, 68 Invalid, 549 Unknown, 0 Unchecked, 2.27ms Time], IncrementalHoareTripleChecker [71 Valid, 478 Invalid, 0 Unknown, 0 Unchecked, 487.03ms Time] [2021-11-12 23:43:58,108 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83801 states. [2021-11-12 23:43:59,093 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83801 to 75793. [2021-11-12 23:43:59,142 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75793 states, 75792 states have (on average 1.2395107663077898) internal successors, (93945), 75792 states have internal predecessors, (93945), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-12 23:43:59,235 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75793 states to 75793 states and 93945 transitions. [2021-11-12 23:43:59,235 INFO L78 Accepts]: Start accepts. Automaton has 75793 states and 93945 transitions. Word has length 265 [2021-11-12 23:43:59,236 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:43:59,236 INFO L470 AbstractCegarLoop]: Abstraction has 75793 states and 93945 transitions. [2021-11-12 23:43:59,236 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 67.0) internal successors, (201), 3 states have internal predecessors, (201), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-12 23:43:59,237 INFO L276 IsEmpty]: Start isEmpty. Operand 75793 states and 93945 transitions. [2021-11-12 23:43:59,608 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 307 [2021-11-12 23:43:59,608 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:43:59,608 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 23:43:59,686 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_782f5664-dcd1-41a7-82bc-c49c046a2195/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-12 23:43:59,809 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_782f5664-dcd1-41a7-82bc-c49c046a2195/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-11-12 23:43:59,809 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:43:59,809 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:43:59,810 INFO L85 PathProgramCache]: Analyzing trace with hash 1722522458, now seen corresponding path program 1 times [2021-11-12 23:43:59,810 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 23:43:59,810 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [193148924] [2021-11-12 23:43:59,810 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:43:59,810 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 23:43:59,862 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:43:59,936 INFO L134 CoverageAnalysis]: Checked inductivity of 372 backedges. 147 proven. 6 refuted. 0 times theorem prover too weak. 219 trivial. 0 not checked. [2021-11-12 23:43:59,936 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 23:43:59,937 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [193148924] [2021-11-12 23:43:59,937 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [193148924] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-12 23:43:59,937 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1997267838] [2021-11-12 23:43:59,937 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:43:59,937 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 23:43:59,938 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_782f5664-dcd1-41a7-82bc-c49c046a2195/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 23:43:59,939 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_782f5664-dcd1-41a7-82bc-c49c046a2195/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 23:43:59,956 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_782f5664-dcd1-41a7-82bc-c49c046a2195/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-12 23:44:00,123 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:44:00,127 INFO L263 TraceCheckSpWp]: Trace formula consists of 650 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-12 23:44:00,132 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:44:00,604 INFO L134 CoverageAnalysis]: Checked inductivity of 372 backedges. 272 proven. 0 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2021-11-12 23:44:00,605 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:44:01,068 INFO L134 CoverageAnalysis]: Checked inductivity of 372 backedges. 272 proven. 0 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2021-11-12 23:44:01,069 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1997267838] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-12 23:44:01,069 INFO L186 FreeRefinementEngine]: Found 2 perfect and 1 imperfect interpolant sequences. [2021-11-12 23:44:01,069 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [3] total 6 [2021-11-12 23:44:01,069 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [733120082] [2021-11-12 23:44:01,069 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-12 23:44:01,070 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-12 23:44:01,070 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 23:44:01,071 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-12 23:44:01,071 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-12 23:44:01,071 INFO L87 Difference]: Start difference. First operand 75793 states and 93945 transitions. Second operand has 4 states, 4 states have (on average 75.25) internal successors, (301), 4 states have internal predecessors, (301), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-12 23:44:02,434 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:44:02,434 INFO L93 Difference]: Finished difference Result 140574 states and 175352 transitions. [2021-11-12 23:44:02,434 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-12 23:44:02,435 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 75.25) internal successors, (301), 4 states have internal predecessors, (301), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 306 [2021-11-12 23:44:02,435 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:44:02,494 INFO L225 Difference]: With dead ends: 140574 [2021-11-12 23:44:02,494 INFO L226 Difference]: Without dead ends: 61064 [2021-11-12 23:44:02,508 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 613 GetRequests, 609 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-12 23:44:02,508 INFO L933 BasicCegarLoop]: 86 mSDtfsCounter, 193 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 689 mSolverCounterSat, 275 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 584.48ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 193 SdHoareTripleChecker+Valid, 92 SdHoareTripleChecker+Invalid, 964 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 3.63ms SdHoareTripleChecker+Time, 275 IncrementalHoareTripleChecker+Valid, 689 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 712.36ms IncrementalHoareTripleChecker+Time [2021-11-12 23:44:02,509 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [193 Valid, 92 Invalid, 964 Unknown, 0 Unchecked, 3.63ms Time], IncrementalHoareTripleChecker [275 Valid, 689 Invalid, 0 Unknown, 0 Unchecked, 712.36ms Time] [2021-11-12 23:44:02,548 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61064 states. [2021-11-12 23:44:03,271 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61064 to 51483. [2021-11-12 23:44:03,299 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51483 states, 51482 states have (on average 1.1461287440270387) internal successors, (59005), 51482 states have internal predecessors, (59005), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-12 23:44:03,372 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51483 states to 51483 states and 59005 transitions. [2021-11-12 23:44:03,372 INFO L78 Accepts]: Start accepts. Automaton has 51483 states and 59005 transitions. Word has length 306 [2021-11-12 23:44:03,372 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:44:03,372 INFO L470 AbstractCegarLoop]: Abstraction has 51483 states and 59005 transitions. [2021-11-12 23:44:03,373 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 75.25) internal successors, (301), 4 states have internal predecessors, (301), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-12 23:44:03,373 INFO L276 IsEmpty]: Start isEmpty. Operand 51483 states and 59005 transitions. [2021-11-12 23:44:03,405 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 323 [2021-11-12 23:44:03,405 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:44:03,405 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 23:44:03,437 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_782f5664-dcd1-41a7-82bc-c49c046a2195/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-12 23:44:03,634 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_782f5664-dcd1-41a7-82bc-c49c046a2195/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-11-12 23:44:03,634 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:44:03,634 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:44:03,635 INFO L85 PathProgramCache]: Analyzing trace with hash -142547820, now seen corresponding path program 1 times [2021-11-12 23:44:03,635 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 23:44:03,635 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [552867756] [2021-11-12 23:44:03,635 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:44:03,635 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 23:44:03,697 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:44:03,815 INFO L134 CoverageAnalysis]: Checked inductivity of 270 backedges. 176 proven. 0 refuted. 0 times theorem prover too weak. 94 trivial. 0 not checked. [2021-11-12 23:44:03,815 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 23:44:03,815 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [552867756] [2021-11-12 23:44:03,815 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [552867756] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-12 23:44:03,815 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-12 23:44:03,816 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-12 23:44:03,816 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [894793682] [2021-11-12 23:44:03,816 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-12 23:44:03,818 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-12 23:44:03,818 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 23:44:03,818 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-12 23:44:03,818 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-12 23:44:03,819 INFO L87 Difference]: Start difference. First operand 51483 states and 59005 transitions. Second operand has 3 states, 3 states have (on average 86.66666666666667) internal successors, (260), 2 states have internal predecessors, (260), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-12 23:44:04,653 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:44:04,653 INFO L93 Difference]: Finished difference Result 118123 states and 135438 transitions. [2021-11-12 23:44:04,654 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-12 23:44:04,654 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 86.66666666666667) internal successors, (260), 2 states have internal predecessors, (260), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 322 [2021-11-12 23:44:04,654 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:44:04,731 INFO L225 Difference]: With dead ends: 118123 [2021-11-12 23:44:04,731 INFO L226 Difference]: Without dead ends: 68643 [2021-11-12 23:44:04,761 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 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 23:44:04,761 INFO L933 BasicCegarLoop]: 40 mSDtfsCounter, 41 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 434 mSolverCounterSat, 43 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 395.32ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 41 SdHoareTripleChecker+Valid, 44 SdHoareTripleChecker+Invalid, 477 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 2.37ms SdHoareTripleChecker+Time, 43 IncrementalHoareTripleChecker+Valid, 434 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 480.38ms IncrementalHoareTripleChecker+Time [2021-11-12 23:44:04,762 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [41 Valid, 44 Invalid, 477 Unknown, 0 Unchecked, 2.37ms Time], IncrementalHoareTripleChecker [43 Valid, 434 Invalid, 0 Unknown, 0 Unchecked, 480.38ms Time] [2021-11-12 23:44:04,816 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68643 states. [2021-11-12 23:44:05,794 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68643 to 67070. [2021-11-12 23:44:05,835 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 67070 states, 67069 states have (on average 1.1460287166947472) internal successors, (76863), 67069 states have internal predecessors, (76863), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-12 23:44:05,911 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67070 states to 67070 states and 76863 transitions. [2021-11-12 23:44:05,911 INFO L78 Accepts]: Start accepts. Automaton has 67070 states and 76863 transitions. Word has length 322 [2021-11-12 23:44:06,278 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:44:06,278 INFO L470 AbstractCegarLoop]: Abstraction has 67070 states and 76863 transitions. [2021-11-12 23:44:06,278 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 86.66666666666667) internal successors, (260), 2 states have internal predecessors, (260), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-12 23:44:06,278 INFO L276 IsEmpty]: Start isEmpty. Operand 67070 states and 76863 transitions. [2021-11-12 23:44:06,316 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 330 [2021-11-12 23:44:06,338 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:44:06,338 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 23:44:06,338 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2021-11-12 23:44:06,339 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:44:06,339 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:44:06,340 INFO L85 PathProgramCache]: Analyzing trace with hash 848149713, now seen corresponding path program 1 times [2021-11-12 23:44:06,340 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 23:44:06,340 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1775614453] [2021-11-12 23:44:06,340 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:44:06,340 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 23:44:06,398 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:44:06,622 INFO L134 CoverageAnalysis]: Checked inductivity of 297 backedges. 197 proven. 6 refuted. 0 times theorem prover too weak. 94 trivial. 0 not checked. [2021-11-12 23:44:06,623 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 23:44:06,623 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1775614453] [2021-11-12 23:44:06,623 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1775614453] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-12 23:44:06,623 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1071602397] [2021-11-12 23:44:06,623 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:44:06,623 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 23:44:06,624 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_782f5664-dcd1-41a7-82bc-c49c046a2195/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 23:44:06,625 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_782f5664-dcd1-41a7-82bc-c49c046a2195/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 23:44:06,640 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_782f5664-dcd1-41a7-82bc-c49c046a2195/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-12 23:44:06,807 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:44:06,810 INFO L263 TraceCheckSpWp]: Trace formula consists of 633 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-12 23:44:06,818 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:44:07,421 INFO L134 CoverageAnalysis]: Checked inductivity of 297 backedges. 261 proven. 0 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-11-12 23:44:07,421 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:44:07,955 INFO L134 CoverageAnalysis]: Checked inductivity of 297 backedges. 261 proven. 0 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-11-12 23:44:07,956 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1071602397] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-12 23:44:07,956 INFO L186 FreeRefinementEngine]: Found 2 perfect and 1 imperfect interpolant sequences. [2021-11-12 23:44:07,956 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [4] total 6 [2021-11-12 23:44:07,956 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1667475155] [2021-11-12 23:44:07,956 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-12 23:44:07,957 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-12 23:44:07,957 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 23:44:07,957 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-12 23:44:07,957 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-12 23:44:07,957 INFO L87 Difference]: Start difference. First operand 67070 states and 76863 transitions. Second operand has 3 states, 3 states have (on average 98.33333333333333) internal successors, (295), 3 states have internal predecessors, (295), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-12 23:44:08,848 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:44:08,848 INFO L93 Difference]: Finished difference Result 123128 states and 141273 transitions. [2021-11-12 23:44:08,849 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-12 23:44:08,849 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 98.33333333333333) internal successors, (295), 3 states have internal predecessors, (295), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 329 [2021-11-12 23:44:08,850 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:44:08,915 INFO L225 Difference]: With dead ends: 123128 [2021-11-12 23:44:08,916 INFO L226 Difference]: Without dead ends: 57060 [2021-11-12 23:44:08,942 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 660 GetRequests, 656 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-12 23:44:08,943 INFO L933 BasicCegarLoop]: 208 mSDtfsCounter, 120 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 423 mSolverCounterSat, 51 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 423.83ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 120 SdHoareTripleChecker+Valid, 211 SdHoareTripleChecker+Invalid, 474 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 2.52ms SdHoareTripleChecker+Time, 51 IncrementalHoareTripleChecker+Valid, 423 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 508.27ms IncrementalHoareTripleChecker+Time [2021-11-12 23:44:08,944 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [120 Valid, 211 Invalid, 474 Unknown, 0 Unchecked, 2.52ms Time], IncrementalHoareTripleChecker [51 Valid, 423 Invalid, 0 Unknown, 0 Unchecked, 508.27ms Time] [2021-11-12 23:44:08,993 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57060 states. [2021-11-12 23:44:09,813 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57060 to 56059. [2021-11-12 23:44:09,851 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56059 states, 56058 states have (on average 1.1440293981233722) internal successors, (64132), 56058 states have internal predecessors, (64132), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-12 23:44:09,918 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56059 states to 56059 states and 64132 transitions. [2021-11-12 23:44:09,918 INFO L78 Accepts]: Start accepts. Automaton has 56059 states and 64132 transitions. Word has length 329 [2021-11-12 23:44:09,919 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:44:09,919 INFO L470 AbstractCegarLoop]: Abstraction has 56059 states and 64132 transitions. [2021-11-12 23:44:09,919 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 98.33333333333333) internal successors, (295), 3 states have internal predecessors, (295), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-12 23:44:09,919 INFO L276 IsEmpty]: Start isEmpty. Operand 56059 states and 64132 transitions. [2021-11-12 23:44:09,954 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 424 [2021-11-12 23:44:09,954 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:44:09,954 INFO L514 BasicCegarLoop]: trace histogram [7, 7, 7, 7, 7, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 5, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 23:44:09,977 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_782f5664-dcd1-41a7-82bc-c49c046a2195/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-12 23:44:10,158 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_782f5664-dcd1-41a7-82bc-c49c046a2195/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 23:44:10,158 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:44:10,159 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:44:10,159 INFO L85 PathProgramCache]: Analyzing trace with hash 1273903771, now seen corresponding path program 1 times [2021-11-12 23:44:10,159 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 23:44:10,159 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [104469723] [2021-11-12 23:44:10,160 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:44:10,160 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 23:44:10,209 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:44:10,653 INFO L134 CoverageAnalysis]: Checked inductivity of 644 backedges. 184 proven. 6 refuted. 0 times theorem prover too weak. 454 trivial. 0 not checked. [2021-11-12 23:44:10,654 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 23:44:10,654 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [104469723] [2021-11-12 23:44:10,654 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [104469723] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-12 23:44:10,654 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1292707326] [2021-11-12 23:44:10,654 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:44:10,654 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 23:44:10,655 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_782f5664-dcd1-41a7-82bc-c49c046a2195/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 23:44:10,666 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_782f5664-dcd1-41a7-82bc-c49c046a2195/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 23:44:10,671 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_782f5664-dcd1-41a7-82bc-c49c046a2195/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-12 23:44:10,890 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:44:10,893 INFO L263 TraceCheckSpWp]: Trace formula consists of 790 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-12 23:44:10,903 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:44:11,904 INFO L134 CoverageAnalysis]: Checked inductivity of 644 backedges. 480 proven. 0 refuted. 0 times theorem prover too weak. 164 trivial. 0 not checked. [2021-11-12 23:44:11,904 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:44:12,598 INFO L134 CoverageAnalysis]: Checked inductivity of 644 backedges. 480 proven. 0 refuted. 0 times theorem prover too weak. 164 trivial. 0 not checked. [2021-11-12 23:44:12,598 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1292707326] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-12 23:44:12,598 INFO L186 FreeRefinementEngine]: Found 2 perfect and 1 imperfect interpolant sequences. [2021-11-12 23:44:12,599 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [3] total 6 [2021-11-12 23:44:12,599 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2041542875] [2021-11-12 23:44:12,599 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-12 23:44:12,600 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-12 23:44:12,601 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 23:44:12,601 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-12 23:44:12,601 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-12 23:44:12,602 INFO L87 Difference]: Start difference. First operand 56059 states and 64132 transitions. Second operand has 4 states, 4 states have (on average 85.25) internal successors, (341), 4 states have internal predecessors, (341), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-12 23:44:14,084 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:44:14,084 INFO L93 Difference]: Finished difference Result 130850 states and 149798 transitions. [2021-11-12 23:44:14,084 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-12 23:44:14,085 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 85.25) internal successors, (341), 4 states have internal predecessors, (341), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 423 [2021-11-12 23:44:14,085 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:44:14,204 INFO L225 Difference]: With dead ends: 130850 [2021-11-12 23:44:14,204 INFO L226 Difference]: Without dead ends: 76222 [2021-11-12 23:44:14,242 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 847 GetRequests, 843 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-12 23:44:14,244 INFO L933 BasicCegarLoop]: 208 mSDtfsCounter, 402 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 609 mSolverCounterSat, 72 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 695.25ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 402 SdHoareTripleChecker+Valid, 214 SdHoareTripleChecker+Invalid, 681 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 5.35ms SdHoareTripleChecker+Time, 72 IncrementalHoareTripleChecker+Valid, 609 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 827.33ms IncrementalHoareTripleChecker+Time [2021-11-12 23:44:14,244 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [402 Valid, 214 Invalid, 681 Unknown, 0 Unchecked, 5.35ms Time], IncrementalHoareTripleChecker [72 Valid, 609 Invalid, 0 Unknown, 0 Unchecked, 827.33ms Time] [2021-11-12 23:44:14,325 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76222 states. [2021-11-12 23:44:15,464 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76222 to 61779. [2021-11-12 23:44:15,503 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 61779 states, 61778 states have (on average 1.1477224902068697) internal successors, (70904), 61778 states have internal predecessors, (70904), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-12 23:44:15,572 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61779 states to 61779 states and 70904 transitions. [2021-11-12 23:44:15,572 INFO L78 Accepts]: Start accepts. Automaton has 61779 states and 70904 transitions. Word has length 423 [2021-11-12 23:44:15,573 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:44:15,573 INFO L470 AbstractCegarLoop]: Abstraction has 61779 states and 70904 transitions. [2021-11-12 23:44:15,573 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 85.25) internal successors, (341), 4 states have internal predecessors, (341), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-12 23:44:15,573 INFO L276 IsEmpty]: Start isEmpty. Operand 61779 states and 70904 transitions. [2021-11-12 23:44:15,981 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 528 [2021-11-12 23:44:15,981 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:44:15,982 INFO L514 BasicCegarLoop]: trace histogram [9, 9, 9, 9, 9, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 6, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 23:44:16,010 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_782f5664-dcd1-41a7-82bc-c49c046a2195/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-12 23:44:16,200 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_782f5664-dcd1-41a7-82bc-c49c046a2195/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 23:44:16,201 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:44:16,201 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:44:16,201 INFO L85 PathProgramCache]: Analyzing trace with hash -1501468440, now seen corresponding path program 1 times [2021-11-12 23:44:16,202 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 23:44:16,202 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [322457456] [2021-11-12 23:44:16,202 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:44:16,202 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 23:44:16,268 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:44:16,403 INFO L134 CoverageAnalysis]: Checked inductivity of 1163 backedges. 257 proven. 6 refuted. 0 times theorem prover too weak. 900 trivial. 0 not checked. [2021-11-12 23:44:16,403 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 23:44:16,403 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [322457456] [2021-11-12 23:44:16,403 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [322457456] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-12 23:44:16,403 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1081125959] [2021-11-12 23:44:16,403 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:44:16,404 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 23:44:16,404 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_782f5664-dcd1-41a7-82bc-c49c046a2195/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 23:44:16,405 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_782f5664-dcd1-41a7-82bc-c49c046a2195/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 23:44:16,425 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_782f5664-dcd1-41a7-82bc-c49c046a2195/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-12 23:44:16,647 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:44:16,650 INFO L263 TraceCheckSpWp]: Trace formula consists of 963 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-12 23:44:16,658 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:44:17,407 INFO L134 CoverageAnalysis]: Checked inductivity of 1163 backedges. 708 proven. 0 refuted. 0 times theorem prover too weak. 455 trivial. 0 not checked. [2021-11-12 23:44:17,407 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:44:18,124 INFO L134 CoverageAnalysis]: Checked inductivity of 1163 backedges. 708 proven. 0 refuted. 0 times theorem prover too weak. 455 trivial. 0 not checked. [2021-11-12 23:44:18,125 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1081125959] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-12 23:44:18,125 INFO L186 FreeRefinementEngine]: Found 2 perfect and 1 imperfect interpolant sequences. [2021-11-12 23:44:18,125 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [3] total 5 [2021-11-12 23:44:18,125 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1831090840] [2021-11-12 23:44:18,126 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-12 23:44:18,127 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-12 23:44:18,127 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 23:44:18,127 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-12 23:44:18,127 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-12 23:44:18,128 INFO L87 Difference]: Start difference. First operand 61779 states and 70904 transitions. Second operand has 3 states, 3 states have (on average 102.66666666666667) internal successors, (308), 3 states have internal predecessors, (308), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-12 23:44:18,959 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:44:18,959 INFO L93 Difference]: Finished difference Result 147295 states and 169766 transitions. [2021-11-12 23:44:18,961 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-12 23:44:18,962 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 102.66666666666667) internal successors, (308), 3 states have internal predecessors, (308), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 527 [2021-11-12 23:44:18,962 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:44:19,058 INFO L225 Difference]: With dead ends: 147295 [2021-11-12 23:44:19,059 INFO L226 Difference]: Without dead ends: 86089 [2021-11-12 23:44:19,356 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1055 GetRequests, 1051 SyntacticMatches, 1 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-12 23:44:19,358 INFO L933 BasicCegarLoop]: 51 mSDtfsCounter, 136 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 445 mSolverCounterSat, 28 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 350.94ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 136 SdHoareTripleChecker+Valid, 54 SdHoareTripleChecker+Invalid, 473 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 1.93ms SdHoareTripleChecker+Time, 28 IncrementalHoareTripleChecker+Valid, 445 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 428.73ms IncrementalHoareTripleChecker+Time [2021-11-12 23:44:19,359 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [136 Valid, 54 Invalid, 473 Unknown, 0 Unchecked, 1.93ms Time], IncrementalHoareTripleChecker [28 Valid, 445 Invalid, 0 Unknown, 0 Unchecked, 428.73ms Time] [2021-11-12 23:44:19,413 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86089 states. [2021-11-12 23:44:20,431 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86089 to 81942. [2021-11-12 23:44:20,472 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 81942 states, 81941 states have (on average 1.142590400410051) internal successors, (93625), 81941 states have internal predecessors, (93625), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-12 23:44:20,593 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81942 states to 81942 states and 93625 transitions. [2021-11-12 23:44:20,593 INFO L78 Accepts]: Start accepts. Automaton has 81942 states and 93625 transitions. Word has length 527 [2021-11-12 23:44:20,595 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:44:20,595 INFO L470 AbstractCegarLoop]: Abstraction has 81942 states and 93625 transitions. [2021-11-12 23:44:20,595 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 102.66666666666667) internal successors, (308), 3 states have internal predecessors, (308), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-12 23:44:20,596 INFO L276 IsEmpty]: Start isEmpty. Operand 81942 states and 93625 transitions. [2021-11-12 23:44:20,693 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 553 [2021-11-12 23:44:20,693 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:44:20,694 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 8, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 6, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 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 23:44:20,720 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_782f5664-dcd1-41a7-82bc-c49c046a2195/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-11-12 23:44:20,902 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_782f5664-dcd1-41a7-82bc-c49c046a2195/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2021-11-12 23:44:20,902 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:44:20,903 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:44:20,903 INFO L85 PathProgramCache]: Analyzing trace with hash 275814175, now seen corresponding path program 1 times [2021-11-12 23:44:20,903 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 23:44:20,904 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1038753259] [2021-11-12 23:44:20,904 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:44:20,904 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 23:44:20,964 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:44:21,104 INFO L134 CoverageAnalysis]: Checked inductivity of 1052 backedges. 221 proven. 6 refuted. 0 times theorem prover too weak. 825 trivial. 0 not checked. [2021-11-12 23:44:21,104 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 23:44:21,104 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1038753259] [2021-11-12 23:44:21,105 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1038753259] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-12 23:44:21,105 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1820667005] [2021-11-12 23:44:21,105 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:44:21,105 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 23:44:21,106 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_782f5664-dcd1-41a7-82bc-c49c046a2195/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 23:44:21,110 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_782f5664-dcd1-41a7-82bc-c49c046a2195/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 23:44:21,120 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_782f5664-dcd1-41a7-82bc-c49c046a2195/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-12 23:44:21,382 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:44:21,386 INFO L263 TraceCheckSpWp]: Trace formula consists of 952 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-12 23:44:21,396 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:44:23,423 INFO L134 CoverageAnalysis]: Checked inductivity of 1052 backedges. 824 proven. 0 refuted. 0 times theorem prover too weak. 228 trivial. 0 not checked. [2021-11-12 23:44:23,423 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:44:24,993 INFO L134 CoverageAnalysis]: Checked inductivity of 1052 backedges. 824 proven. 0 refuted. 0 times theorem prover too weak. 228 trivial. 0 not checked. [2021-11-12 23:44:24,994 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1820667005] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-12 23:44:24,994 INFO L186 FreeRefinementEngine]: Found 2 perfect and 1 imperfect interpolant sequences. [2021-11-12 23:44:24,994 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [3] total 6 [2021-11-12 23:44:24,995 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [198630281] [2021-11-12 23:44:24,995 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-12 23:44:24,996 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-12 23:44:24,996 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 23:44:24,997 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-12 23:44:24,997 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-12 23:44:24,997 INFO L87 Difference]: Start difference. First operand 81942 states and 93625 transitions. Second operand has 4 states, 4 states have (on average 133.0) internal successors, (532), 4 states have internal predecessors, (532), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-12 23:44:26,402 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:44:26,402 INFO L93 Difference]: Finished difference Result 176322 states and 201063 transitions. [2021-11-12 23:44:26,403 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-12 23:44:26,403 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 133.0) internal successors, (532), 4 states have internal predecessors, (532), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 552 [2021-11-12 23:44:26,403 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:44:26,403 INFO L225 Difference]: With dead ends: 176322 [2021-11-12 23:44:26,403 INFO L226 Difference]: Without dead ends: 0 [2021-11-12 23:44:26,446 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1105 GetRequests, 1101 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-12 23:44:26,447 INFO L933 BasicCegarLoop]: 191 mSDtfsCounter, 49 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 789 mSolverCounterSat, 116 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 755.88ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 49 SdHoareTripleChecker+Valid, 197 SdHoareTripleChecker+Invalid, 905 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 4.43ms SdHoareTripleChecker+Time, 116 IncrementalHoareTripleChecker+Valid, 789 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 908.42ms IncrementalHoareTripleChecker+Time [2021-11-12 23:44:26,447 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [49 Valid, 197 Invalid, 905 Unknown, 0 Unchecked, 4.43ms Time], IncrementalHoareTripleChecker [116 Valid, 789 Invalid, 0 Unknown, 0 Unchecked, 908.42ms Time] [2021-11-12 23:44:26,447 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2021-11-12 23:44:26,448 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2021-11-12 23:44:26,448 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 0 states, 0 states have (on average 0.0) internal successors, (0), 0 states have internal predecessors, (0), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-12 23:44:26,448 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2021-11-12 23:44:26,448 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 552 [2021-11-12 23:44:26,449 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:44:26,449 INFO L470 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2021-11-12 23:44:26,449 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 133.0) internal successors, (532), 4 states have internal predecessors, (532), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-12 23:44:26,449 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2021-11-12 23:44:26,449 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2021-11-12 23:44:26,452 INFO L764 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION (0 of 1 remaining) [2021-11-12 23:44:26,484 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_782f5664-dcd1-41a7-82bc-c49c046a2195/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-12 23:44:26,666 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_782f5664-dcd1-41a7-82bc-c49c046a2195/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2021-11-12 23:44:26,668 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions.