./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/verifythis/tree_del_iter_incorrect.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version aef121e0 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93013782-6ccb-43f6-bf91-026e925d895d/bin/utaipan-EQgc7hIp5V/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93013782-6ccb-43f6-bf91-026e925d895d/bin/utaipan-EQgc7hIp5V/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93013782-6ccb-43f6-bf91-026e925d895d/bin/utaipan-EQgc7hIp5V/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93013782-6ccb-43f6-bf91-026e925d895d/bin/utaipan-EQgc7hIp5V/config/TaipanReach.xml -i ../../sv-benchmarks/c/verifythis/tree_del_iter_incorrect.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93013782-6ccb-43f6-bf91-026e925d895d/bin/utaipan-EQgc7hIp5V/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93013782-6ccb-43f6-bf91-026e925d895d/bin/utaipan-EQgc7hIp5V --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 11dfc9c267e4b15a18edd43bd8f373e4d6af1fa864b5f35e9818e0875ad24411 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-aef121e [2021-11-23 02:27:16,106 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-23 02:27:16,109 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-23 02:27:16,170 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-23 02:27:16,171 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-23 02:27:16,176 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-23 02:27:16,178 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-23 02:27:16,183 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-23 02:27:16,186 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-23 02:27:16,192 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-23 02:27:16,194 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-23 02:27:16,196 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-23 02:27:16,197 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-23 02:27:16,199 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-23 02:27:16,202 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-23 02:27:16,207 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-23 02:27:16,209 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-23 02:27:16,210 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-23 02:27:16,213 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-23 02:27:16,224 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-23 02:27:16,227 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-23 02:27:16,228 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-23 02:27:16,233 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-23 02:27:16,234 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-23 02:27:16,244 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-23 02:27:16,244 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-23 02:27:16,245 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-23 02:27:16,247 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-23 02:27:16,248 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-23 02:27:16,250 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-23 02:27:16,250 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-23 02:27:16,251 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-23 02:27:16,254 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-23 02:27:16,255 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-23 02:27:16,257 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-23 02:27:16,257 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-23 02:27:16,258 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-23 02:27:16,259 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-23 02:27:16,259 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-23 02:27:16,260 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-23 02:27:16,261 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-23 02:27:16,262 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93013782-6ccb-43f6-bf91-026e925d895d/bin/utaipan-EQgc7hIp5V/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-23 02:27:16,312 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-23 02:27:16,312 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-23 02:27:16,313 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-23 02:27:16,314 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-23 02:27:16,315 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-23 02:27:16,315 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-23 02:27:16,315 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-23 02:27:16,316 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-23 02:27:16,316 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-23 02:27:16,316 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-23 02:27:16,318 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-23 02:27:16,318 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-23 02:27:16,318 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-23 02:27:16,318 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-23 02:27:16,319 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-23 02:27:16,319 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-23 02:27:16,319 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-23 02:27:16,320 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-23 02:27:16,320 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-23 02:27:16,321 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-23 02:27:16,321 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-23 02:27:16,321 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-23 02:27:16,322 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-23 02:27:16,322 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-23 02:27:16,322 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-23 02:27:16,322 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-23 02:27:16,324 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-23 02:27:16,325 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-23 02:27:16,325 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-23 02:27:16,325 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-23 02:27:16,325 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-23 02:27:16,326 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-23 02:27:16,326 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 02:27:16,327 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-23 02:27:16,327 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-23 02:27:16,327 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-23 02:27:16,327 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-23 02:27:16,328 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-23 02:27:16,328 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-23 02:27:16,328 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-23 02:27:16,328 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-23 02:27:16,329 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_93013782-6ccb-43f6-bf91-026e925d895d/bin/utaipan-EQgc7hIp5V/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93013782-6ccb-43f6-bf91-026e925d895d/bin/utaipan-EQgc7hIp5V Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 11dfc9c267e4b15a18edd43bd8f373e4d6af1fa864b5f35e9818e0875ad24411 [2021-11-23 02:27:16,666 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-23 02:27:16,689 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-23 02:27:16,693 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-23 02:27:16,694 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-23 02:27:16,696 INFO L275 PluginConnector]: CDTParser initialized [2021-11-23 02:27:16,698 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93013782-6ccb-43f6-bf91-026e925d895d/bin/utaipan-EQgc7hIp5V/../../sv-benchmarks/c/verifythis/tree_del_iter_incorrect.c [2021-11-23 02:27:16,805 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93013782-6ccb-43f6-bf91-026e925d895d/bin/utaipan-EQgc7hIp5V/data/37d048c3c/9c521001038a4a6b98c5e96c3eb06cee/FLAGe1d06a661 [2021-11-23 02:27:17,488 INFO L306 CDTParser]: Found 1 translation units. [2021-11-23 02:27:17,488 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93013782-6ccb-43f6-bf91-026e925d895d/sv-benchmarks/c/verifythis/tree_del_iter_incorrect.c [2021-11-23 02:27:17,496 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93013782-6ccb-43f6-bf91-026e925d895d/bin/utaipan-EQgc7hIp5V/data/37d048c3c/9c521001038a4a6b98c5e96c3eb06cee/FLAGe1d06a661 [2021-11-23 02:27:17,805 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93013782-6ccb-43f6-bf91-026e925d895d/bin/utaipan-EQgc7hIp5V/data/37d048c3c/9c521001038a4a6b98c5e96c3eb06cee [2021-11-23 02:27:17,808 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-23 02:27:17,809 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-23 02:27:17,812 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-23 02:27:17,812 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-23 02:27:17,816 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-23 02:27:17,817 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 02:27:17" (1/1) ... [2021-11-23 02:27:17,818 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2c842a29 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:27:17, skipping insertion in model container [2021-11-23 02:27:17,819 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 02:27:17" (1/1) ... [2021-11-23 02:27:17,826 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-23 02:27:17,843 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 02:27:18,099 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93013782-6ccb-43f6-bf91-026e925d895d/sv-benchmarks/c/verifythis/tree_del_iter_incorrect.c[619,632] [2021-11-23 02:27:18,126 WARN L1533 CHandler]: Possible shadowing of function min [2021-11-23 02:27:18,153 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 02:27:18,170 INFO L203 MainTranslator]: Completed pre-run [2021-11-23 02:27:18,186 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93013782-6ccb-43f6-bf91-026e925d895d/sv-benchmarks/c/verifythis/tree_del_iter_incorrect.c[619,632] [2021-11-23 02:27:18,197 WARN L1533 CHandler]: Possible shadowing of function min [2021-11-23 02:27:18,210 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 02:27:18,242 INFO L208 MainTranslator]: Completed translation [2021-11-23 02:27:18,242 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:27:18 WrapperNode [2021-11-23 02:27:18,242 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-23 02:27:18,244 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-23 02:27:18,244 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-23 02:27:18,245 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-23 02:27:18,254 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:27:18" (1/1) ... [2021-11-23 02:27:18,267 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:27:18" (1/1) ... [2021-11-23 02:27:18,301 INFO L137 Inliner]: procedures = 29, calls = 61, calls flagged for inlining = 5, calls inlined = 5, statements flattened = 110 [2021-11-23 02:27:18,302 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-23 02:27:18,303 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-23 02:27:18,303 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-23 02:27:18,303 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-23 02:27:18,311 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:27:18" (1/1) ... [2021-11-23 02:27:18,312 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:27:18" (1/1) ... [2021-11-23 02:27:18,318 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:27:18" (1/1) ... [2021-11-23 02:27:18,319 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:27:18" (1/1) ... [2021-11-23 02:27:18,339 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:27:18" (1/1) ... [2021-11-23 02:27:18,345 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:27:18" (1/1) ... [2021-11-23 02:27:18,348 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:27:18" (1/1) ... [2021-11-23 02:27:18,354 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-23 02:27:18,355 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-23 02:27:18,355 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-23 02:27:18,355 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-23 02:27:18,357 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:27:18" (1/1) ... [2021-11-23 02:27:18,367 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 02:27:18,390 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93013782-6ccb-43f6-bf91-026e925d895d/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:27:18,407 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93013782-6ccb-43f6-bf91-026e925d895d/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-23 02:27:18,426 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93013782-6ccb-43f6-bf91-026e925d895d/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-23 02:27:18,466 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-23 02:27:18,466 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-23 02:27:18,467 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2021-11-23 02:27:18,467 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-11-23 02:27:18,467 INFO L130 BoogieDeclarations]: Found specification of procedure min [2021-11-23 02:27:18,467 INFO L138 BoogieDeclarations]: Found implementation of procedure min [2021-11-23 02:27:18,467 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-11-23 02:27:18,468 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.meminit [2021-11-23 02:27:18,468 INFO L138 BoogieDeclarations]: Found implementation of procedure #Ultimate.meminit [2021-11-23 02:27:18,468 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2021-11-23 02:27:18,468 INFO L130 BoogieDeclarations]: Found specification of procedure nondet_tree [2021-11-23 02:27:18,468 INFO L138 BoogieDeclarations]: Found implementation of procedure nondet_tree [2021-11-23 02:27:18,469 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-23 02:27:18,469 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2021-11-23 02:27:18,469 INFO L130 BoogieDeclarations]: Found specification of procedure size [2021-11-23 02:27:18,470 INFO L138 BoogieDeclarations]: Found implementation of procedure size [2021-11-23 02:27:18,470 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-23 02:27:18,470 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-23 02:27:18,470 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-11-23 02:27:18,471 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-11-23 02:27:18,471 INFO L130 BoogieDeclarations]: Found specification of procedure tree_inorder [2021-11-23 02:27:18,471 INFO L138 BoogieDeclarations]: Found implementation of procedure tree_inorder [2021-11-23 02:27:18,471 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-11-23 02:27:18,599 INFO L236 CfgBuilder]: Building ICFG [2021-11-23 02:27:18,602 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-23 02:27:19,043 INFO L277 CfgBuilder]: Performing block encoding [2021-11-23 02:27:19,116 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-23 02:27:19,116 INFO L301 CfgBuilder]: Removed 2 assume(true) statements. [2021-11-23 02:27:19,119 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 02:27:19 BoogieIcfgContainer [2021-11-23 02:27:19,122 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-23 02:27:19,124 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-23 02:27:19,126 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-23 02:27:19,130 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-23 02:27:19,130 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 02:27:17" (1/3) ... [2021-11-23 02:27:19,131 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@53125ed0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 02:27:19, skipping insertion in model container [2021-11-23 02:27:19,131 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:27:18" (2/3) ... [2021-11-23 02:27:19,132 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@53125ed0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 02:27:19, skipping insertion in model container [2021-11-23 02:27:19,132 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 02:27:19" (3/3) ... [2021-11-23 02:27:19,133 INFO L111 eAbstractionObserver]: Analyzing ICFG tree_del_iter_incorrect.c [2021-11-23 02:27:19,137 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-23 02:27:19,138 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-23 02:27:19,178 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-23 02:27:19,185 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 [2021-11-23 02:27:19,185 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-23 02:27:19,204 INFO L276 IsEmpty]: Start isEmpty. Operand has 69 states, 41 states have (on average 1.2195121951219512) internal successors, (50), 42 states have internal predecessors, (50), 20 states have call successors, (20), 6 states have call predecessors, (20), 6 states have return successors, (20), 20 states have call predecessors, (20), 20 states have call successors, (20) [2021-11-23 02:27:19,212 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-11-23 02:27:19,212 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:27:19,213 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] [2021-11-23 02:27:19,213 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:27:19,218 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:27:19,219 INFO L85 PathProgramCache]: Analyzing trace with hash -1966965702, now seen corresponding path program 1 times [2021-11-23 02:27:19,228 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:27:19,229 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2084965847] [2021-11-23 02:27:19,229 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:27:19,230 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:27:19,381 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:27:19,484 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:27:19,484 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:27:19,485 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2084965847] [2021-11-23 02:27:19,485 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2084965847] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:27:19,486 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:27:19,486 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 02:27:19,488 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [229855225] [2021-11-23 02:27:19,489 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:27:19,494 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:27:19,494 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:27:19,526 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:27:19,527 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:27:19,529 INFO L87 Difference]: Start difference. First operand has 69 states, 41 states have (on average 1.2195121951219512) internal successors, (50), 42 states have internal predecessors, (50), 20 states have call successors, (20), 6 states have call predecessors, (20), 6 states have return successors, (20), 20 states have call predecessors, (20), 20 states have call successors, (20) Second operand has 4 states, 4 states have (on average 5.25) internal successors, (21), 3 states have internal predecessors, (21), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 3 states have call predecessors, (5), 2 states have call successors, (5) [2021-11-23 02:27:19,603 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:27:19,603 INFO L93 Difference]: Finished difference Result 119 states and 161 transitions. [2021-11-23 02:27:19,604 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:27:19,606 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 5.25) internal successors, (21), 3 states have internal predecessors, (21), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 3 states have call predecessors, (5), 2 states have call successors, (5) Word has length 32 [2021-11-23 02:27:19,607 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:27:19,618 INFO L225 Difference]: With dead ends: 119 [2021-11-23 02:27:19,618 INFO L226 Difference]: Without dead ends: 70 [2021-11-23 02:27:19,622 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:27:19,626 INFO L933 BasicCegarLoop]: 81 mSDtfsCounter, 0 mSDsluCounter, 174 mSDsCounter, 0 mSdLazyCounter, 26 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 240 SdHoareTripleChecker+Invalid, 26 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 26 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 02:27:19,628 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 240 Invalid, 26 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 26 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 02:27:19,649 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2021-11-23 02:27:19,679 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 70. [2021-11-23 02:27:19,681 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 70 states, 42 states have (on average 1.1666666666666667) internal successors, (49), 43 states have internal predecessors, (49), 20 states have call successors, (20), 6 states have call predecessors, (20), 7 states have return successors, (23), 20 states have call predecessors, (23), 20 states have call successors, (23) [2021-11-23 02:27:19,684 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 92 transitions. [2021-11-23 02:27:19,686 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 92 transitions. Word has length 32 [2021-11-23 02:27:19,686 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:27:19,687 INFO L470 AbstractCegarLoop]: Abstraction has 70 states and 92 transitions. [2021-11-23 02:27:19,687 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 5.25) internal successors, (21), 3 states have internal predecessors, (21), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 3 states have call predecessors, (5), 2 states have call successors, (5) [2021-11-23 02:27:19,687 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 92 transitions. [2021-11-23 02:27:19,691 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-11-23 02:27:19,691 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:27:19,691 INFO L514 BasicCegarLoop]: trace histogram [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] [2021-11-23 02:27:19,692 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-23 02:27:19,692 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:27:19,693 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:27:19,693 INFO L85 PathProgramCache]: Analyzing trace with hash -1690324847, now seen corresponding path program 1 times [2021-11-23 02:27:19,694 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:27:19,694 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [649324318] [2021-11-23 02:27:19,694 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:27:19,694 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:27:19,721 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:27:19,921 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 02:27:19,922 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:27:19,922 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [649324318] [2021-11-23 02:27:19,922 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [649324318] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:27:19,923 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1395908504] [2021-11-23 02:27:19,923 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:27:19,923 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:27:19,924 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93013782-6ccb-43f6-bf91-026e925d895d/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:27:19,925 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93013782-6ccb-43f6-bf91-026e925d895d/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:27:19,947 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93013782-6ccb-43f6-bf91-026e925d895d/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-23 02:27:20,037 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:27:20,041 INFO L263 TraceCheckSpWp]: Trace formula consists of 234 conjuncts, 25 conjunts are in the unsatisfiable core [2021-11-23 02:27:20,049 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:27:20,417 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 02:27:20,417 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:27:20,731 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 02:27:20,739 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1395908504] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:27:20,740 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1892122906] [2021-11-23 02:27:20,776 INFO L159 IcfgInterpreter]: Started Sifa with 37 locations of interest [2021-11-23 02:27:20,776 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:27:20,782 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:610) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-23 02:27:20,784 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:27:20,785 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7, 7] total 10 [2021-11-23 02:27:20,786 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1940859629] [2021-11-23 02:27:20,786 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:27:20,788 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-23 02:27:20,788 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:27:20,789 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-23 02:27:20,790 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2021-11-23 02:27:20,791 INFO L87 Difference]: Start difference. First operand 70 states and 92 transitions. Second operand has 10 states, 10 states have (on average 3.5) internal successors, (35), 9 states have internal predecessors, (35), 5 states have call successors, (11), 2 states have call predecessors, (11), 4 states have return successors, (10), 5 states have call predecessors, (10), 5 states have call successors, (10) [2021-11-23 02:27:21,009 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:27:21,009 INFO L93 Difference]: Finished difference Result 125 states and 166 transitions. [2021-11-23 02:27:21,010 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 02:27:21,010 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 3.5) internal successors, (35), 9 states have internal predecessors, (35), 5 states have call successors, (11), 2 states have call predecessors, (11), 4 states have return successors, (10), 5 states have call predecessors, (10), 5 states have call successors, (10) Word has length 44 [2021-11-23 02:27:21,011 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:27:21,013 INFO L225 Difference]: With dead ends: 125 [2021-11-23 02:27:21,014 INFO L226 Difference]: Without dead ends: 72 [2021-11-23 02:27:21,015 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 87 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=34, Invalid=98, Unknown=0, NotChecked=0, Total=132 [2021-11-23 02:27:21,017 INFO L933 BasicCegarLoop]: 75 mSDtfsCounter, 20 mSDsluCounter, 383 mSDsCounter, 0 mSdLazyCounter, 112 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 424 SdHoareTripleChecker+Invalid, 120 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 112 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:27:21,018 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [20 Valid, 424 Invalid, 120 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 112 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:27:21,019 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2021-11-23 02:27:21,030 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 72. [2021-11-23 02:27:21,031 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 72 states, 43 states have (on average 1.1627906976744187) internal successors, (50), 45 states have internal predecessors, (50), 20 states have call successors, (20), 6 states have call predecessors, (20), 8 states have return successors, (25), 20 states have call predecessors, (25), 20 states have call successors, (25) [2021-11-23 02:27:21,033 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 95 transitions. [2021-11-23 02:27:21,034 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 95 transitions. Word has length 44 [2021-11-23 02:27:21,034 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:27:21,034 INFO L470 AbstractCegarLoop]: Abstraction has 72 states and 95 transitions. [2021-11-23 02:27:21,035 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 3.5) internal successors, (35), 9 states have internal predecessors, (35), 5 states have call successors, (11), 2 states have call predecessors, (11), 4 states have return successors, (10), 5 states have call predecessors, (10), 5 states have call successors, (10) [2021-11-23 02:27:21,035 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 95 transitions. [2021-11-23 02:27:21,038 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2021-11-23 02:27:21,038 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:27:21,038 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 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] [2021-11-23 02:27:21,065 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93013782-6ccb-43f6-bf91-026e925d895d/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-23 02:27:21,245 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93013782-6ccb-43f6-bf91-026e925d895d/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:27:21,246 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:27:21,246 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:27:21,246 INFO L85 PathProgramCache]: Analyzing trace with hash -1409444242, now seen corresponding path program 1 times [2021-11-23 02:27:21,247 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:27:21,247 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1549082519] [2021-11-23 02:27:21,247 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:27:21,247 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:27:21,298 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:27:21,399 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2021-11-23 02:27:21,399 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:27:21,399 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1549082519] [2021-11-23 02:27:21,400 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1549082519] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:27:21,400 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:27:21,400 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-11-23 02:27:21,400 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1622128301] [2021-11-23 02:27:21,401 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:27:21,401 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-23 02:27:21,401 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:27:21,402 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-23 02:27:21,402 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2021-11-23 02:27:21,403 INFO L87 Difference]: Start difference. First operand 72 states and 95 transitions. Second operand has 8 states, 7 states have (on average 4.0) internal successors, (28), 7 states have internal predecessors, (28), 4 states have call successors, (10), 2 states have call predecessors, (10), 3 states have return successors, (9), 4 states have call predecessors, (9), 4 states have call successors, (9) [2021-11-23 02:27:21,576 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:27:21,576 INFO L93 Difference]: Finished difference Result 125 states and 166 transitions. [2021-11-23 02:27:21,577 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-23 02:27:21,577 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 4.0) internal successors, (28), 7 states have internal predecessors, (28), 4 states have call successors, (10), 2 states have call predecessors, (10), 3 states have return successors, (9), 4 states have call predecessors, (9), 4 states have call successors, (9) Word has length 54 [2021-11-23 02:27:21,578 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:27:21,580 INFO L225 Difference]: With dead ends: 125 [2021-11-23 02:27:21,580 INFO L226 Difference]: Without dead ends: 74 [2021-11-23 02:27:21,582 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=25, Invalid=85, Unknown=0, NotChecked=0, Total=110 [2021-11-23 02:27:21,583 INFO L933 BasicCegarLoop]: 74 mSDtfsCounter, 43 mSDsluCounter, 406 mSDsCounter, 0 mSdLazyCounter, 111 mSolverCounterSat, 22 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 47 SdHoareTripleChecker+Valid, 448 SdHoareTripleChecker+Invalid, 133 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 111 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:27:21,584 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [47 Valid, 448 Invalid, 133 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 111 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:27:21,585 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2021-11-23 02:27:21,601 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 74. [2021-11-23 02:27:21,602 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 74 states, 44 states have (on average 1.1590909090909092) internal successors, (51), 47 states have internal predecessors, (51), 20 states have call successors, (20), 6 states have call predecessors, (20), 9 states have return successors, (27), 20 states have call predecessors, (27), 20 states have call successors, (27) [2021-11-23 02:27:21,604 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 98 transitions. [2021-11-23 02:27:21,605 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 98 transitions. Word has length 54 [2021-11-23 02:27:21,606 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:27:21,609 INFO L470 AbstractCegarLoop]: Abstraction has 74 states and 98 transitions. [2021-11-23 02:27:21,609 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 4.0) internal successors, (28), 7 states have internal predecessors, (28), 4 states have call successors, (10), 2 states have call predecessors, (10), 3 states have return successors, (9), 4 states have call predecessors, (9), 4 states have call successors, (9) [2021-11-23 02:27:21,609 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 98 transitions. [2021-11-23 02:27:21,613 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2021-11-23 02:27:21,616 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:27:21,617 INFO L514 BasicCegarLoop]: trace histogram [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] [2021-11-23 02:27:21,618 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-23 02:27:21,618 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:27:21,619 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:27:21,620 INFO L85 PathProgramCache]: Analyzing trace with hash -994765980, now seen corresponding path program 1 times [2021-11-23 02:27:21,620 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:27:21,621 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [736916131] [2021-11-23 02:27:21,625 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:27:21,625 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:27:21,702 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:27:21,902 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 8 proven. 2 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2021-11-23 02:27:21,902 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:27:21,903 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [736916131] [2021-11-23 02:27:21,903 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [736916131] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:27:21,903 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [350117636] [2021-11-23 02:27:21,904 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:27:21,904 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:27:21,904 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93013782-6ccb-43f6-bf91-026e925d895d/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:27:21,905 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93013782-6ccb-43f6-bf91-026e925d895d/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:27:21,914 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93013782-6ccb-43f6-bf91-026e925d895d/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-23 02:27:22,057 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:27:22,059 INFO L263 TraceCheckSpWp]: Trace formula consists of 346 conjuncts, 15 conjunts are in the unsatisfiable core [2021-11-23 02:27:22,069 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:27:22,236 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 29 trivial. 0 not checked. [2021-11-23 02:27:22,236 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:27:22,237 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [350117636] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:27:22,237 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:27:22,237 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [12] total 15 [2021-11-23 02:27:22,238 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1764618860] [2021-11-23 02:27:22,239 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:27:22,241 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-23 02:27:22,242 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:27:22,242 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-23 02:27:22,243 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=182, Unknown=0, NotChecked=0, Total=210 [2021-11-23 02:27:22,243 INFO L87 Difference]: Start difference. First operand 74 states and 98 transitions. Second operand has 8 states, 8 states have (on average 3.875) internal successors, (31), 7 states have internal predecessors, (31), 4 states have call successors, (12), 2 states have call predecessors, (12), 3 states have return successors, (11), 5 states have call predecessors, (11), 3 states have call successors, (11) [2021-11-23 02:27:22,430 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:27:22,431 INFO L93 Difference]: Finished difference Result 121 states and 161 transitions. [2021-11-23 02:27:22,432 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-23 02:27:22,433 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 3.875) internal successors, (31), 7 states have internal predecessors, (31), 4 states have call successors, (12), 2 states have call predecessors, (12), 3 states have return successors, (11), 5 states have call predecessors, (11), 3 states have call successors, (11) Word has length 66 [2021-11-23 02:27:22,438 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:27:22,445 INFO L225 Difference]: With dead ends: 121 [2021-11-23 02:27:22,446 INFO L226 Difference]: Without dead ends: 76 [2021-11-23 02:27:22,448 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 65 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=40, Invalid=266, Unknown=0, NotChecked=0, Total=306 [2021-11-23 02:27:22,452 INFO L933 BasicCegarLoop]: 73 mSDtfsCounter, 40 mSDsluCounter, 400 mSDsCounter, 0 mSdLazyCounter, 119 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 44 SdHoareTripleChecker+Valid, 440 SdHoareTripleChecker+Invalid, 140 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 119 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:27:22,452 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [44 Valid, 440 Invalid, 140 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 119 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:27:22,453 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2021-11-23 02:27:22,469 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 76. [2021-11-23 02:27:22,470 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 76 states, 45 states have (on average 1.1555555555555554) internal successors, (52), 49 states have internal predecessors, (52), 20 states have call successors, (20), 6 states have call predecessors, (20), 10 states have return successors, (30), 20 states have call predecessors, (30), 20 states have call successors, (30) [2021-11-23 02:27:22,474 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 102 transitions. [2021-11-23 02:27:22,475 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 102 transitions. Word has length 66 [2021-11-23 02:27:22,475 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:27:22,476 INFO L470 AbstractCegarLoop]: Abstraction has 76 states and 102 transitions. [2021-11-23 02:27:22,476 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 3.875) internal successors, (31), 7 states have internal predecessors, (31), 4 states have call successors, (12), 2 states have call predecessors, (12), 3 states have return successors, (11), 5 states have call predecessors, (11), 3 states have call successors, (11) [2021-11-23 02:27:22,476 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 102 transitions. [2021-11-23 02:27:22,480 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2021-11-23 02:27:22,480 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:27:22,480 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 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] [2021-11-23 02:27:22,515 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93013782-6ccb-43f6-bf91-026e925d895d/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-23 02:27:22,694 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93013782-6ccb-43f6-bf91-026e925d895d/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:27:22,695 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:27:22,699 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:27:22,699 INFO L85 PathProgramCache]: Analyzing trace with hash -1225136857, now seen corresponding path program 1 times [2021-11-23 02:27:22,699 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:27:22,700 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1127368343] [2021-11-23 02:27:22,700 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:27:22,700 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:27:22,756 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-11-23 02:27:22,756 INFO L355 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-11-23 02:27:22,806 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-11-23 02:27:22,858 INFO L133 FreeRefinementEngine]: Strategy SIFA_TAIPAN found a feasible trace [2021-11-23 02:27:22,858 INFO L628 BasicCegarLoop]: Counterexample is feasible [2021-11-23 02:27:22,859 INFO L764 garLoopResultBuilder]: Registering result UNSAFE for location __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION (0 of 1 remaining) [2021-11-23 02:27:22,862 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-11-23 02:27:22,865 INFO L732 BasicCegarLoop]: Path program histogram: [1, 1, 1, 1, 1] [2021-11-23 02:27:22,869 INFO L179 ceAbstractionStarter]: Computing trace abstraction results [2021-11-23 02:27:22,959 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 23.11 02:27:22 BoogieIcfgContainer [2021-11-23 02:27:22,959 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-11-23 02:27:22,960 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2021-11-23 02:27:22,960 INFO L271 PluginConnector]: Initializing Witness Printer... [2021-11-23 02:27:22,961 INFO L275 PluginConnector]: Witness Printer initialized [2021-11-23 02:27:22,961 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 02:27:19" (3/4) ... [2021-11-23 02:27:22,963 INFO L131 WitnessPrinter]: Generating witness for reachability counterexample [2021-11-23 02:27:23,046 INFO L141 WitnessManager]: Wrote witness to /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93013782-6ccb-43f6-bf91-026e925d895d/bin/utaipan-EQgc7hIp5V/witness.graphml [2021-11-23 02:27:23,046 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2021-11-23 02:27:23,047 INFO L158 Benchmark]: Toolchain (without parser) took 5237.51ms. Allocated memory was 96.5MB in the beginning and 155.2MB in the end (delta: 58.7MB). Free memory was 59.8MB in the beginning and 121.2MB in the end (delta: -61.4MB). There was no memory consumed. Max. memory is 16.1GB. [2021-11-23 02:27:23,048 INFO L158 Benchmark]: CDTParser took 0.38ms. Allocated memory is still 96.5MB. Free memory was 68.1MB in the beginning and 68.1MB in the end (delta: 29.0kB). There was no memory consumed. Max. memory is 16.1GB. [2021-11-23 02:27:23,048 INFO L158 Benchmark]: CACSL2BoogieTranslator took 431.50ms. Allocated memory is still 96.5MB. Free memory was 59.6MB in the beginning and 69.1MB in the end (delta: -9.5MB). Peak memory consumption was 6.3MB. Max. memory is 16.1GB. [2021-11-23 02:27:23,049 INFO L158 Benchmark]: Boogie Procedure Inliner took 57.90ms. Allocated memory is still 96.5MB. Free memory was 69.1MB in the beginning and 67.1MB in the end (delta: 2.0MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. [2021-11-23 02:27:23,049 INFO L158 Benchmark]: Boogie Preprocessor took 51.20ms. Allocated memory is still 96.5MB. Free memory was 67.1MB in the beginning and 65.4MB in the end (delta: 1.7MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. [2021-11-23 02:27:23,050 INFO L158 Benchmark]: RCFGBuilder took 767.17ms. Allocated memory is still 96.5MB. Free memory was 65.0MB in the beginning and 46.1MB in the end (delta: 18.9MB). Peak memory consumption was 18.9MB. Max. memory is 16.1GB. [2021-11-23 02:27:23,050 INFO L158 Benchmark]: TraceAbstraction took 3835.63ms. Allocated memory was 96.5MB in the beginning and 155.2MB in the end (delta: 58.7MB). Free memory was 45.5MB in the beginning and 125.4MB in the end (delta: -79.9MB). Peak memory consumption was 33.7MB. Max. memory is 16.1GB. [2021-11-23 02:27:23,051 INFO L158 Benchmark]: Witness Printer took 86.22ms. Allocated memory is still 155.2MB. Free memory was 125.4MB in the beginning and 121.2MB in the end (delta: 4.2MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. [2021-11-23 02:27:23,054 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.38ms. Allocated memory is still 96.5MB. Free memory was 68.1MB in the beginning and 68.1MB in the end (delta: 29.0kB). There was no memory consumed. Max. memory is 16.1GB. * CACSL2BoogieTranslator took 431.50ms. Allocated memory is still 96.5MB. Free memory was 59.6MB in the beginning and 69.1MB in the end (delta: -9.5MB). Peak memory consumption was 6.3MB. Max. memory is 16.1GB. * Boogie Procedure Inliner took 57.90ms. Allocated memory is still 96.5MB. Free memory was 69.1MB in the beginning and 67.1MB in the end (delta: 2.0MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. * Boogie Preprocessor took 51.20ms. Allocated memory is still 96.5MB. Free memory was 67.1MB in the beginning and 65.4MB in the end (delta: 1.7MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. * RCFGBuilder took 767.17ms. Allocated memory is still 96.5MB. Free memory was 65.0MB in the beginning and 46.1MB in the end (delta: 18.9MB). Peak memory consumption was 18.9MB. Max. memory is 16.1GB. * TraceAbstraction took 3835.63ms. Allocated memory was 96.5MB in the beginning and 155.2MB in the end (delta: 58.7MB). Free memory was 45.5MB in the beginning and 125.4MB in the end (delta: -79.9MB). Peak memory consumption was 33.7MB. Max. memory is 16.1GB. * Witness Printer took 86.22ms. Allocated memory is still 155.2MB. Free memory was 125.4MB in the beginning and 121.2MB in the end (delta: 4.2MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - StatisticsResult: ErrorAutomatonStatistics NumberErrorTraces: 0, NumberStatementsAllTraces: 0, NumberRelevantStatements: 0, 0.0s ErrorAutomatonConstructionTimeTotal, 0.0s FaulLocalizationTime, NumberStatementsFirstTrace: -1, TraceLengthAvg: 0, 0.0s ErrorAutomatonConstructionTimeAvg, 0.0s ErrorAutomatonDifferenceTimeAvg, 0.0s ErrorAutomatonDifferenceTimeTotal, NumberOfNoEnhancement: 0, NumberOfFiniteEnhancement: 0, NumberOfInfiniteEnhancement: 0 - CounterExampleResult [Line: 16]: a call to reach_error is reachable a call to reach_error is reachable We found a FailurePath: [L105] CALL, EXPR nondet_tree() [L25] COND FALSE !(__VERIFIER_nondet_bool()) [L28] struct node *n = (struct node *)malloc(sizeof(struct node)); [L29] n->data = __VERIFIER_nondet_int() [L30] CALL, EXPR nondet_tree() [L25] COND TRUE __VERIFIER_nondet_bool() [L26] return 0; VAL [\result={0:0}] [L30] RET, EXPR nondet_tree() VAL [n={-2:0}, nondet_tree()={0:0}] [L30] n->left = nondet_tree() [L31] CALL, EXPR nondet_tree() [L25] COND TRUE __VERIFIER_nondet_bool() [L26] return 0; VAL [\result={0:0}] [L31] RET, EXPR nondet_tree() VAL [n={-2:0}, nondet_tree()={0:0}] [L31] n->right = nondet_tree() [L32] return n; VAL [\result={-2:0}, n={-2:0}] [L105] RET, EXPR nondet_tree() VAL [nondet_tree()={-2:0}] [L105] CALL task(nondet_tree()) [L83] CALL, EXPR min(t) VAL [n={-2:0}] [L37] COND FALSE !(!n) [L40] EXPR n->left VAL [n={-2:0}, n={-2:0}, n->left={0:0}] [L40] CALL, EXPR min(n->left) VAL [n={0:0}] [L37] COND TRUE !n [L38] return 2147483647; VAL [\result=2147483647, n={0:0}, n={0:0}] [L40] RET, EXPR min(n->left) VAL [min(n->left)=2147483647, n={-2:0}, n={-2:0}, n->left={0:0}] [L40] int a = min(n->left); [L41] EXPR n->right VAL [a=2147483647, n={-2:0}, n={-2:0}, n->right={0:0}] [L41] CALL, EXPR min(n->right) VAL [n={0:0}] [L37] COND TRUE !n [L38] return 2147483647; VAL [\result=2147483647, n={0:0}, n={0:0}] [L41] RET, EXPR min(n->right) VAL [a=2147483647, min(n->right)=2147483647, n={-2:0}, n={-2:0}, n->right={0:0}] [L41] int b = min(n->right); [L42] COND TRUE a <= b [L42] return a; VAL [\result=2147483647, a=2147483647, b=2147483647, n={-2:0}, n={-2:0}] [L83] RET, EXPR min(t) VAL [min(t)=2147483647, t={-2:0}, t={-2:0}] [L83] int a = min(t); [L84] int b; VAL [a=2147483647, b={5:0}, t={-2:0}, t={-2:0}] [L86] CALL, EXPR size(t) VAL [t={-2:0}] [L78] COND FALSE !(!t) [L79] EXPR t->left VAL [t={-2:0}, t={-2:0}, t->left={0:0}] [L79] CALL, EXPR size(t->left) VAL [t={0:0}] [L78] COND TRUE !t [L78] return 0; VAL [\result=0, t={0:0}, t={0:0}] [L79] RET, EXPR size(t->left) VAL [size(t->left)=0, t={-2:0}, t={-2:0}, t->left={0:0}] [L79] EXPR t->right VAL [size(t->left)=0, t={-2:0}, t={-2:0}, t->left={0:0}, t->right={0:0}] [L79] CALL, EXPR size(t->right) VAL [t={0:0}] [L78] COND TRUE !t [L78] return 0; VAL [\result=0, t={0:0}, t={0:0}] [L79] RET, EXPR size(t->right) VAL [size(t->left)=0, size(t->right)=0, t={-2:0}, t={-2:0}, t->left={0:0}, t->right={0:0}] [L79] return size(t->left) + size(t->right) + 1; [L86] RET, EXPR size(t) VAL [a=2147483647, b={5:0}, size(t)=1, t={-2:0}, t={-2:0}] [L86] int n = size(t); [L87] CALL assume_abort_if_not(n != 0) [L10] COND FALSE !(!cond) [L87] RET assume_abort_if_not(n != 0) [L88] EXPR, FCALL calloc(n, sizeof(int)) VAL [a=2147483647, b={5:0}, calloc(n, sizeof(int))={-3:0}, n=1, t={-2:0}, t={-2:0}] [L88] int *x = calloc(n, sizeof(int)); VAL [a=2147483647, b={5:0}, calloc(n, sizeof(int))={-3:0}, n=1, t={-2:0}, t={-2:0}, x={-3:0}] [L89] CALL tree_inorder(t, x, n) VAL [\old(i)=1, a={-3:0}, t={-2:0}] [L67] COND FALSE !(!t) [L70] EXPR t->left VAL [\old(i)=1, a={-3:0}, a={-3:0}, i=1, t={-2:0}, t={-2:0}, t->left={0:0}] [L70] CALL, EXPR tree_inorder(t->left, a, i) VAL [\old(i)=1, a={-3:0}, t={0:0}] [L67] COND TRUE !t [L68] return i; VAL [\old(i)=1, \result=1, a={-3:0}, a={-3:0}, i=1, t={0:0}, t={0:0}] [L70] RET, EXPR tree_inorder(t->left, a, i) VAL [\old(i)=1, a={-3:0}, a={-3:0}, i=1, t={-2:0}, t={-2:0}, t->left={0:0}, tree_inorder(t->left, a, i)=1] [L70] i = tree_inorder(t->left, a, i) [L71] EXPR i++ [L71] EXPR t->data [L71] a[i++] = t->data [L72] EXPR t->right VAL [\old(i)=1, a={-3:0}, a={-3:0}, i=2, t={-2:0}, t={-2:0}, t->right={0:0}] [L72] CALL, EXPR tree_inorder(t->right, a, i) VAL [\old(i)=2, a={-3:0}, t={0:0}] [L67] COND TRUE !t [L68] return i; VAL [\old(i)=2, \result=2, a={-3:0}, a={-3:0}, i=2, t={0:0}, t={0:0}] [L72] RET, EXPR tree_inorder(t->right, a, i) VAL [\old(i)=1, a={-3:0}, a={-3:0}, i=2, t={-2:0}, t={-2:0}, t->right={0:0}, tree_inorder(t->right, a, i)=2] [L72] i = tree_inorder(t->right, a, i) [L73] return i; VAL [\old(i)=1, \result=2, a={-3:0}, a={-3:0}, i=2, t={-2:0}, t={-2:0}] [L89] RET tree_inorder(t, x, n) VAL [a=2147483647, b={5:0}, calloc(n, sizeof(int))={-3:0}, n=1, t={-2:0}, t={-2:0}, tree_inorder(t, x, n)=2, x={-3:0}] [L90] EXPR x[0] VAL [a=2147483647, b={5:0}, calloc(n, sizeof(int))={-3:0}, n=1, t={-2:0}, t={-2:0}, x={-3:0}, x[0]=0] [L90] CALL __VERIFIER_assert(a == x[0]) VAL [\old(cond)=0] [L16] COND TRUE !cond VAL [\old(cond)=0, cond=0] [L16] reach_error() VAL [\old(cond)=0, cond=0] - StatisticsResult: Ultimate Automizer benchmark data CFG has 7 procedures, 69 locations, 1 error locations. Started 1 CEGAR loops. OverallTime: 3.7s, OverallIterations: 5, TraceHistogramMax: 3, PathProgramHistogramMax: 1, EmptinessCheckTime: 0.0s, AutomataDifference: 0.8s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, PartialOrderReductionTime: 0.0s, HoareTripleCheckerStatistics: 0 mSolverCounterUnknown, 111 SdHoareTripleChecker+Valid, 0.4s IncrementalHoareTripleChecker+Time, 0 mSdLazyCounter, 103 mSDsluCounter, 1552 SdHoareTripleChecker+Invalid, 0.3s Time, 0 mProtectedAction, 0 SdHoareTripleChecker+Unchecked, 0 IncrementalHoareTripleChecker+Unchecked, 1363 mSDsCounter, 51 IncrementalHoareTripleChecker+Valid, 0 mProtectedPredicate, 368 IncrementalHoareTripleChecker+Invalid, 419 SdHoareTripleChecker+Unknown, 0 mSolverCounterNotChecked, 51 mSolverCounterUnsat, 303 mSDtfsCounter, 368 mSolverCounterSat, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Unknown, PredicateUnifierStatistics: 0 DeclaredPredicates, 194 GetRequests, 157 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.3s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=76occurred in iteration=4, InterpolantAutomatonStates: 27, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.1s AutomataMinimizationTime, 4 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.1s SsaConstructionTime, 0.3s SatisfiabilityAnalysisTime, 1.5s InterpolantComputationTime, 384 NumberOfCodeBlocks, 384 NumberOfCodeBlocksAsserted, 7 NumberOfCheckSat, 343 ConstructedInterpolants, 0 QuantifiedInterpolants, 824 SizeOfPredicates, 10 NumberOfNonLiveVariables, 580 ConjunctsInSsa, 40 ConjunctsInUnsatCore, 7 InterpolantComputations, 3 PerfectInterpolantSequences, 115/123 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! [2021-11-23 02:27:23,123 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93013782-6ccb-43f6-bf91-026e925d895d/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Forceful destruction successful, exit code 0 Received shutdown request... --- End real Ultimate output --- Execution finished normally Writing output log to file Ultimate.log Writing human readable error path to file UltimateCounterExample.errorpath Result: FALSE