./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/recursive/MultCommutative-2.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 2329fc70 Calling Ultimate with: /usr/lib/jvm/java-11-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/config/TaipanReach.xml -i ../../sv-benchmarks/c/recursive/MultCommutative-2.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh --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 ce29b37e076ab683230ebf17073db3b7759ea39570dd2ef64322b6d43bb636cd --- Real Ultimate output --- [0.001s][warning][os,container] Duplicate cpuset controllers detected. Picking /sys/fs/cgroup/cpuset, skipping /sys/fs/cgroup/cpuset. This is Ultimate 0.2.2-dev-2329fc7 [2022-12-14 10:43:07,177 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-12-14 10:43:07,179 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-12-14 10:43:07,192 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-12-14 10:43:07,192 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-12-14 10:43:07,193 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-12-14 10:43:07,194 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-12-14 10:43:07,195 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-12-14 10:43:07,196 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-12-14 10:43:07,197 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-12-14 10:43:07,197 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-12-14 10:43:07,198 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-12-14 10:43:07,198 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-12-14 10:43:07,199 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-12-14 10:43:07,200 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-12-14 10:43:07,201 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-12-14 10:43:07,201 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-12-14 10:43:07,202 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-12-14 10:43:07,203 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-12-14 10:43:07,204 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-12-14 10:43:07,205 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-12-14 10:43:07,207 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-12-14 10:43:07,208 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-12-14 10:43:07,209 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-12-14 10:43:07,213 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-12-14 10:43:07,213 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-12-14 10:43:07,214 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-12-14 10:43:07,215 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-12-14 10:43:07,215 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-12-14 10:43:07,217 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-12-14 10:43:07,217 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-12-14 10:43:07,218 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-12-14 10:43:07,218 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-12-14 10:43:07,219 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-12-14 10:43:07,220 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-12-14 10:43:07,220 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-12-14 10:43:07,221 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-12-14 10:43:07,221 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-12-14 10:43:07,221 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-12-14 10:43:07,222 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-12-14 10:43:07,223 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-12-14 10:43:07,223 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/config/svcomp-Reach-32bit-Taipan_Default.epf [2022-12-14 10:43:07,239 INFO L113 SettingsManager]: Loading preferences was successful [2022-12-14 10:43:07,239 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-12-14 10:43:07,239 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-12-14 10:43:07,240 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-12-14 10:43:07,240 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-12-14 10:43:07,240 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-12-14 10:43:07,240 INFO L138 SettingsManager]: * User list type=DISABLED [2022-12-14 10:43:07,241 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-12-14 10:43:07,241 INFO L138 SettingsManager]: * Explicit value domain=true [2022-12-14 10:43:07,241 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-12-14 10:43:07,241 INFO L138 SettingsManager]: * Octagon Domain=false [2022-12-14 10:43:07,241 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-12-14 10:43:07,241 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-12-14 10:43:07,241 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-12-14 10:43:07,241 INFO L138 SettingsManager]: * Interval Domain=false [2022-12-14 10:43:07,241 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-12-14 10:43:07,242 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-12-14 10:43:07,242 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-12-14 10:43:07,242 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-12-14 10:43:07,242 INFO L138 SettingsManager]: * sizeof long=4 [2022-12-14 10:43:07,243 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-12-14 10:43:07,243 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-12-14 10:43:07,243 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-12-14 10:43:07,243 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-12-14 10:43:07,243 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-12-14 10:43:07,243 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-12-14 10:43:07,243 INFO L138 SettingsManager]: * sizeof long double=12 [2022-12-14 10:43:07,243 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-12-14 10:43:07,243 INFO L138 SettingsManager]: * Use constant arrays=true [2022-12-14 10:43:07,244 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-12-14 10:43:07,244 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-12-14 10:43:07,244 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-12-14 10:43:07,244 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-12-14 10:43:07,244 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-12-14 10:43:07,244 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-12-14 10:43:07,244 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-12-14 10:43:07,244 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-12-14 10:43:07,245 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-12-14 10:43:07,245 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-12-14 10:43:07,245 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-12-14 10:43:07,245 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-12-14 10:43:07,245 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode 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_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> ce29b37e076ab683230ebf17073db3b7759ea39570dd2ef64322b6d43bb636cd [2022-12-14 10:43:07,422 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-12-14 10:43:07,441 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-12-14 10:43:07,443 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-12-14 10:43:07,444 INFO L271 PluginConnector]: Initializing CDTParser... [2022-12-14 10:43:07,445 INFO L275 PluginConnector]: CDTParser initialized [2022-12-14 10:43:07,446 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/../../sv-benchmarks/c/recursive/MultCommutative-2.c [2022-12-14 10:43:09,998 INFO L500 CDTParser]: Created temporary CDT project at NULL [2022-12-14 10:43:10,114 INFO L351 CDTParser]: Found 1 translation units. [2022-12-14 10:43:10,115 INFO L172 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/sv-benchmarks/c/recursive/MultCommutative-2.c [2022-12-14 10:43:10,119 INFO L394 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/data/ccd8e917f/78e5a01544c14e15b49f050adebb767b/FLAG985d49450 [2022-12-14 10:43:10,130 INFO L402 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/data/ccd8e917f/78e5a01544c14e15b49f050adebb767b [2022-12-14 10:43:10,132 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-12-14 10:43:10,133 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-12-14 10:43:10,134 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-12-14 10:43:10,134 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-12-14 10:43:10,137 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-12-14 10:43:10,138 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.12 10:43:10" (1/1) ... [2022-12-14 10:43:10,139 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1addaae8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 10:43:10, skipping insertion in model container [2022-12-14 10:43:10,139 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.12 10:43:10" (1/1) ... [2022-12-14 10:43:10,145 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-12-14 10:43:10,155 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-12-14 10:43:10,257 WARN L237 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_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/sv-benchmarks/c/recursive/MultCommutative-2.c[970,983] [2022-12-14 10:43:10,260 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-12-14 10:43:10,268 INFO L203 MainTranslator]: Completed pre-run [2022-12-14 10:43:10,279 WARN L237 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_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/sv-benchmarks/c/recursive/MultCommutative-2.c[970,983] [2022-12-14 10:43:10,279 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-12-14 10:43:10,288 INFO L208 MainTranslator]: Completed translation [2022-12-14 10:43:10,289 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 10:43:10 WrapperNode [2022-12-14 10:43:10,289 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-12-14 10:43:10,290 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-12-14 10:43:10,290 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-12-14 10:43:10,290 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-12-14 10:43:10,295 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 10:43:10" (1/1) ... [2022-12-14 10:43:10,300 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 10:43:10" (1/1) ... [2022-12-14 10:43:10,310 INFO L138 Inliner]: procedures = 13, calls = 11, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 36 [2022-12-14 10:43:10,311 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-12-14 10:43:10,311 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-12-14 10:43:10,311 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-12-14 10:43:10,311 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-12-14 10:43:10,317 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 10:43:10" (1/1) ... [2022-12-14 10:43:10,318 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 10:43:10" (1/1) ... [2022-12-14 10:43:10,319 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 10:43:10" (1/1) ... [2022-12-14 10:43:10,319 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 10:43:10" (1/1) ... [2022-12-14 10:43:10,320 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 10:43:10" (1/1) ... [2022-12-14 10:43:10,322 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 10:43:10" (1/1) ... [2022-12-14 10:43:10,322 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 10:43:10" (1/1) ... [2022-12-14 10:43:10,323 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 10:43:10" (1/1) ... [2022-12-14 10:43:10,324 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-12-14 10:43:10,324 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-12-14 10:43:10,324 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-12-14 10:43:10,324 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-12-14 10:43:10,325 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 10:43:10" (1/1) ... [2022-12-14 10:43:10,330 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-12-14 10:43:10,337 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 10:43:10,347 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-12-14 10:43:10,350 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-12-14 10:43:10,380 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-12-14 10:43:10,381 INFO L130 BoogieDeclarations]: Found specification of procedure mult [2022-12-14 10:43:10,381 INFO L138 BoogieDeclarations]: Found implementation of procedure mult [2022-12-14 10:43:10,381 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-12-14 10:43:10,381 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-12-14 10:43:10,381 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-12-14 10:43:10,439 INFO L235 CfgBuilder]: Building ICFG [2022-12-14 10:43:10,441 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-12-14 10:43:10,541 INFO L276 CfgBuilder]: Performing block encoding [2022-12-14 10:43:10,572 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-12-14 10:43:10,572 INFO L300 CfgBuilder]: Removed 0 assume(true) statements. [2022-12-14 10:43:10,575 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.12 10:43:10 BoogieIcfgContainer [2022-12-14 10:43:10,575 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-12-14 10:43:10,578 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-12-14 10:43:10,578 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-12-14 10:43:10,581 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-12-14 10:43:10,582 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 14.12 10:43:10" (1/3) ... [2022-12-14 10:43:10,582 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@52ba235f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.12 10:43:10, skipping insertion in model container [2022-12-14 10:43:10,583 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 10:43:10" (2/3) ... [2022-12-14 10:43:10,583 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@52ba235f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.12 10:43:10, skipping insertion in model container [2022-12-14 10:43:10,583 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.12 10:43:10" (3/3) ... [2022-12-14 10:43:10,585 INFO L112 eAbstractionObserver]: Analyzing ICFG MultCommutative-2.c [2022-12-14 10:43:10,616 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-12-14 10:43:10,616 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-12-14 10:43:10,661 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-12-14 10:43:10,666 INFO L357 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, mPorIndependenceSettings=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@786856aa, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-12-14 10:43:10,666 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-12-14 10:43:10,670 INFO L276 IsEmpty]: Start isEmpty. Operand has 21 states, 14 states have (on average 1.4285714285714286) internal successors, (20), 15 states have internal predecessors, (20), 4 states have call successors, (4), 1 states have call predecessors, (4), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2022-12-14 10:43:10,677 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2022-12-14 10:43:10,677 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 10:43:10,678 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 10:43:10,679 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 10:43:10,683 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 10:43:10,684 INFO L85 PathProgramCache]: Analyzing trace with hash 647179642, now seen corresponding path program 1 times [2022-12-14 10:43:10,691 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 10:43:10,691 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1913970742] [2022-12-14 10:43:10,691 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 10:43:10,692 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 10:43:10,771 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 10:43:10,916 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2022-12-14 10:43:10,917 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 10:43:10,917 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1913970742] [2022-12-14 10:43:10,918 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1913970742] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 10:43:10,918 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 10:43:10,918 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-12-14 10:43:10,919 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1971096762] [2022-12-14 10:43:10,920 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 10:43:10,923 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-12-14 10:43:10,924 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 10:43:10,947 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-12-14 10:43:10,948 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2022-12-14 10:43:10,950 INFO L87 Difference]: Start difference. First operand has 21 states, 14 states have (on average 1.4285714285714286) internal successors, (20), 15 states have internal predecessors, (20), 4 states have call successors, (4), 1 states have call predecessors, (4), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Second operand has 7 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 5 states have internal predecessors, (11), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-12-14 10:43:11,043 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 10:43:11,044 INFO L93 Difference]: Finished difference Result 39 states and 50 transitions. [2022-12-14 10:43:11,045 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-12-14 10:43:11,046 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 5 states have internal predecessors, (11), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 19 [2022-12-14 10:43:11,046 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 10:43:11,052 INFO L225 Difference]: With dead ends: 39 [2022-12-14 10:43:11,052 INFO L226 Difference]: Without dead ends: 27 [2022-12-14 10:43:11,055 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2022-12-14 10:43:11,057 INFO L413 NwaCegarLoop]: 22 mSDtfsCounter, 10 mSDsluCounter, 99 mSDsCounter, 0 mSdLazyCounter, 50 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 121 SdHoareTripleChecker+Invalid, 50 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 50 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 10:43:11,058 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [12 Valid, 121 Invalid, 50 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 50 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 10:43:11,072 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2022-12-14 10:43:11,087 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 23. [2022-12-14 10:43:11,088 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 15 states have (on average 1.1333333333333333) internal successors, (17), 16 states have internal predecessors, (17), 5 states have call successors, (5), 1 states have call predecessors, (5), 2 states have return successors, (9), 5 states have call predecessors, (9), 5 states have call successors, (9) [2022-12-14 10:43:11,089 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 31 transitions. [2022-12-14 10:43:11,090 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 31 transitions. Word has length 19 [2022-12-14 10:43:11,090 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 10:43:11,090 INFO L495 AbstractCegarLoop]: Abstraction has 23 states and 31 transitions. [2022-12-14 10:43:11,090 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 5 states have internal predecessors, (11), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-12-14 10:43:11,091 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 31 transitions. [2022-12-14 10:43:11,092 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2022-12-14 10:43:11,092 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 10:43:11,092 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 10:43:11,092 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-12-14 10:43:11,093 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 10:43:11,093 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 10:43:11,093 INFO L85 PathProgramCache]: Analyzing trace with hash 1580415186, now seen corresponding path program 1 times [2022-12-14 10:43:11,094 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 10:43:11,094 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1892838362] [2022-12-14 10:43:11,094 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 10:43:11,094 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 10:43:11,109 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 10:43:11,224 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2022-12-14 10:43:11,224 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 10:43:11,225 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1892838362] [2022-12-14 10:43:11,225 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1892838362] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 10:43:11,225 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 10:43:11,225 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-12-14 10:43:11,225 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2055158085] [2022-12-14 10:43:11,225 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 10:43:11,227 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-12-14 10:43:11,227 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 10:43:11,227 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-12-14 10:43:11,228 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2022-12-14 10:43:11,228 INFO L87 Difference]: Start difference. First operand 23 states and 31 transitions. Second operand has 8 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 5 states have internal predecessors, (13), 2 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2022-12-14 10:43:11,281 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 10:43:11,281 INFO L93 Difference]: Finished difference Result 36 states and 49 transitions. [2022-12-14 10:43:11,281 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-12-14 10:43:11,282 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 5 states have internal predecessors, (13), 2 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 25 [2022-12-14 10:43:11,282 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 10:43:11,282 INFO L225 Difference]: With dead ends: 36 [2022-12-14 10:43:11,283 INFO L226 Difference]: Without dead ends: 32 [2022-12-14 10:43:11,283 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2022-12-14 10:43:11,284 INFO L413 NwaCegarLoop]: 19 mSDtfsCounter, 4 mSDsluCounter, 104 mSDsCounter, 0 mSdLazyCounter, 43 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 123 SdHoareTripleChecker+Invalid, 43 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 43 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 10:43:11,284 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [6 Valid, 123 Invalid, 43 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 43 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 10:43:11,285 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2022-12-14 10:43:11,290 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 24. [2022-12-14 10:43:11,290 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 16 states have (on average 1.125) internal successors, (18), 16 states have internal predecessors, (18), 5 states have call successors, (5), 1 states have call predecessors, (5), 2 states have return successors, (9), 6 states have call predecessors, (9), 5 states have call successors, (9) [2022-12-14 10:43:11,291 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 32 transitions. [2022-12-14 10:43:11,291 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 32 transitions. Word has length 25 [2022-12-14 10:43:11,291 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 10:43:11,291 INFO L495 AbstractCegarLoop]: Abstraction has 24 states and 32 transitions. [2022-12-14 10:43:11,292 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 5 states have internal predecessors, (13), 2 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2022-12-14 10:43:11,292 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 32 transitions. [2022-12-14 10:43:11,293 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2022-12-14 10:43:11,293 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 10:43:11,293 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 10:43:11,294 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-12-14 10:43:11,294 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 10:43:11,294 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 10:43:11,295 INFO L85 PathProgramCache]: Analyzing trace with hash -124187766, now seen corresponding path program 1 times [2022-12-14 10:43:11,295 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 10:43:11,295 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [52058535] [2022-12-14 10:43:11,295 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 10:43:11,295 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 10:43:11,311 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 10:43:11,357 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2022-12-14 10:43:11,357 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 10:43:11,358 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [52058535] [2022-12-14 10:43:11,358 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [52058535] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 10:43:11,358 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1425292537] [2022-12-14 10:43:11,358 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 10:43:11,359 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 10:43:11,359 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 10:43:11,360 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 10:43:11,361 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-12-14 10:43:11,412 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 10:43:11,414 INFO L263 TraceCheckSpWp]: Trace formula consists of 102 conjuncts, 4 conjunts are in the unsatisfiable core [2022-12-14 10:43:11,418 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 10:43:11,464 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2022-12-14 10:43:11,464 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 10:43:11,526 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2022-12-14 10:43:11,526 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1425292537] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 10:43:11,527 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2089002238] [2022-12-14 10:43:11,543 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-12-14 10:43:11,543 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 10:43:11,547 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:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) 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) [2022-12-14 10:43:11,548 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 10:43:11,548 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 6 [2022-12-14 10:43:11,548 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [643512854] [2022-12-14 10:43:11,548 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 10:43:11,549 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-12-14 10:43:11,549 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 10:43:11,550 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-12-14 10:43:11,550 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2022-12-14 10:43:11,550 INFO L87 Difference]: Start difference. First operand 24 states and 32 transitions. Second operand has 6 states, 6 states have (on average 3.3333333333333335) internal successors, (20), 6 states have internal predecessors, (20), 2 states have call successors, (3), 1 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2022-12-14 10:43:11,601 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 10:43:11,601 INFO L93 Difference]: Finished difference Result 32 states and 46 transitions. [2022-12-14 10:43:11,601 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-12-14 10:43:11,601 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.3333333333333335) internal successors, (20), 6 states have internal predecessors, (20), 2 states have call successors, (3), 1 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 26 [2022-12-14 10:43:11,602 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 10:43:11,602 INFO L225 Difference]: With dead ends: 32 [2022-12-14 10:43:11,603 INFO L226 Difference]: Without dead ends: 24 [2022-12-14 10:43:11,603 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 50 SyntacticMatches, 2 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=16, Invalid=26, Unknown=0, NotChecked=0, Total=42 [2022-12-14 10:43:11,604 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 8 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 58 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 41 SdHoareTripleChecker+Invalid, 63 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 58 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 10:43:11,605 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [10 Valid, 41 Invalid, 63 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 58 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 10:43:11,606 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2022-12-14 10:43:11,609 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 21. [2022-12-14 10:43:11,610 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 14 states have (on average 1.1428571428571428) internal successors, (16), 15 states have internal predecessors, (16), 4 states have call successors, (4), 1 states have call predecessors, (4), 2 states have return successors, (7), 4 states have call predecessors, (7), 4 states have call successors, (7) [2022-12-14 10:43:11,610 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 27 transitions. [2022-12-14 10:43:11,611 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 27 transitions. Word has length 26 [2022-12-14 10:43:11,611 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 10:43:11,611 INFO L495 AbstractCegarLoop]: Abstraction has 21 states and 27 transitions. [2022-12-14 10:43:11,611 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 3.3333333333333335) internal successors, (20), 6 states have internal predecessors, (20), 2 states have call successors, (3), 1 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2022-12-14 10:43:11,611 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 27 transitions. [2022-12-14 10:43:11,612 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2022-12-14 10:43:11,612 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 10:43:11,613 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 10:43:11,619 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-12-14 10:43:11,813 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 10:43:11,815 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 10:43:11,817 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 10:43:11,817 INFO L85 PathProgramCache]: Analyzing trace with hash -590605896, now seen corresponding path program 2 times [2022-12-14 10:43:11,818 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 10:43:11,819 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [200916354] [2022-12-14 10:43:11,819 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 10:43:11,819 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 10:43:11,875 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 10:43:12,000 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2022-12-14 10:43:12,001 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 10:43:12,001 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [200916354] [2022-12-14 10:43:12,001 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [200916354] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 10:43:12,001 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 10:43:12,001 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-12-14 10:43:12,002 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2041618015] [2022-12-14 10:43:12,002 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 10:43:12,002 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-12-14 10:43:12,002 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 10:43:12,003 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-12-14 10:43:12,003 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-12-14 10:43:12,003 INFO L87 Difference]: Start difference. First operand 21 states and 27 transitions. Second operand has 5 states, 5 states have (on average 3.4) internal successors, (17), 5 states have internal predecessors, (17), 1 states have call successors, (3), 1 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2022-12-14 10:43:12,042 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 10:43:12,043 INFO L93 Difference]: Finished difference Result 25 states and 30 transitions. [2022-12-14 10:43:12,043 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-12-14 10:43:12,043 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.4) internal successors, (17), 5 states have internal predecessors, (17), 1 states have call successors, (3), 1 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) Word has length 26 [2022-12-14 10:43:12,043 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 10:43:12,044 INFO L225 Difference]: With dead ends: 25 [2022-12-14 10:43:12,044 INFO L226 Difference]: Without dead ends: 21 [2022-12-14 10:43:12,045 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2022-12-14 10:43:12,046 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 8 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 42 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 36 SdHoareTripleChecker+Invalid, 47 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 42 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 10:43:12,046 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [10 Valid, 36 Invalid, 47 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 42 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 10:43:12,047 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2022-12-14 10:43:12,050 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2022-12-14 10:43:12,050 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 14 states have (on average 1.1428571428571428) internal successors, (16), 15 states have internal predecessors, (16), 4 states have call successors, (4), 1 states have call predecessors, (4), 2 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2022-12-14 10:43:12,051 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 26 transitions. [2022-12-14 10:43:12,051 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 26 transitions. Word has length 26 [2022-12-14 10:43:12,051 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 10:43:12,051 INFO L495 AbstractCegarLoop]: Abstraction has 21 states and 26 transitions. [2022-12-14 10:43:12,052 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 3.4) internal successors, (17), 5 states have internal predecessors, (17), 1 states have call successors, (3), 1 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2022-12-14 10:43:12,052 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 26 transitions. [2022-12-14 10:43:12,052 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2022-12-14 10:43:12,053 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 10:43:12,053 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 10:43:12,053 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2022-12-14 10:43:12,053 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 10:43:12,053 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 10:43:12,054 INFO L85 PathProgramCache]: Analyzing trace with hash 132154764, now seen corresponding path program 3 times [2022-12-14 10:43:12,054 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 10:43:12,054 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [650128391] [2022-12-14 10:43:12,054 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 10:43:12,054 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 10:43:12,066 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 10:43:12,391 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 4 proven. 22 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-12-14 10:43:12,392 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 10:43:12,392 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [650128391] [2022-12-14 10:43:12,392 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [650128391] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 10:43:12,392 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1935594505] [2022-12-14 10:43:12,392 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 10:43:12,392 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 10:43:12,392 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 10:43:12,393 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 10:43:12,394 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-12-14 10:43:12,433 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 10:43:12,433 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 10:43:12,434 INFO L263 TraceCheckSpWp]: Trace formula consists of 121 conjuncts, 41 conjunts are in the unsatisfiable core [2022-12-14 10:43:12,437 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 10:43:12,676 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 2 proven. 14 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-12-14 10:43:12,677 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 10:43:13,461 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 8 proven. 14 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-12-14 10:43:13,461 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1935594505] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 10:43:13,461 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [33794178] [2022-12-14 10:43:13,464 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-12-14 10:43:13,464 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 10:43:13,464 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:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) 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) [2022-12-14 10:43:13,464 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 10:43:13,464 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 11, 14] total 35 [2022-12-14 10:43:13,465 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [48692078] [2022-12-14 10:43:13,465 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 10:43:13,465 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2022-12-14 10:43:13,465 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 10:43:13,466 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2022-12-14 10:43:13,467 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=129, Invalid=1061, Unknown=0, NotChecked=0, Total=1190 [2022-12-14 10:43:13,467 INFO L87 Difference]: Start difference. First operand 21 states and 26 transitions. Second operand has 35 states, 32 states have (on average 1.53125) internal successors, (49), 24 states have internal predecessors, (49), 9 states have call successors, (9), 1 states have call predecessors, (9), 7 states have return successors, (11), 11 states have call predecessors, (11), 9 states have call successors, (11) [2022-12-14 10:43:14,040 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 10:43:14,040 INFO L93 Difference]: Finished difference Result 40 states and 50 transitions. [2022-12-14 10:43:14,040 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-12-14 10:43:14,040 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 32 states have (on average 1.53125) internal successors, (49), 24 states have internal predecessors, (49), 9 states have call successors, (9), 1 states have call predecessors, (9), 7 states have return successors, (11), 11 states have call predecessors, (11), 9 states have call successors, (11) Word has length 33 [2022-12-14 10:43:14,041 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 10:43:14,042 INFO L225 Difference]: With dead ends: 40 [2022-12-14 10:43:14,042 INFO L226 Difference]: Without dead ends: 36 [2022-12-14 10:43:14,043 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 46 SyntacticMatches, 2 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 402 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=293, Invalid=1777, Unknown=0, NotChecked=0, Total=2070 [2022-12-14 10:43:14,044 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 78 mSDsluCounter, 119 mSDsCounter, 0 mSdLazyCounter, 349 mSolverCounterSat, 70 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 79 SdHoareTripleChecker+Valid, 133 SdHoareTripleChecker+Invalid, 419 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 70 IncrementalHoareTripleChecker+Valid, 349 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-12-14 10:43:14,044 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [79 Valid, 133 Invalid, 419 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [70 Valid, 349 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-12-14 10:43:14,044 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2022-12-14 10:43:14,051 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 28. [2022-12-14 10:43:14,051 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 18 states have (on average 1.1111111111111112) internal successors, (20), 20 states have internal predecessors, (20), 5 states have call successors, (5), 1 states have call predecessors, (5), 4 states have return successors, (13), 6 states have call predecessors, (13), 5 states have call successors, (13) [2022-12-14 10:43:14,052 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 38 transitions. [2022-12-14 10:43:14,052 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 38 transitions. Word has length 33 [2022-12-14 10:43:14,052 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 10:43:14,052 INFO L495 AbstractCegarLoop]: Abstraction has 28 states and 38 transitions. [2022-12-14 10:43:14,053 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 32 states have (on average 1.53125) internal successors, (49), 24 states have internal predecessors, (49), 9 states have call successors, (9), 1 states have call predecessors, (9), 7 states have return successors, (11), 11 states have call predecessors, (11), 9 states have call successors, (11) [2022-12-14 10:43:14,053 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 38 transitions. [2022-12-14 10:43:14,054 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2022-12-14 10:43:14,054 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 10:43:14,054 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 4, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 10:43:14,059 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2022-12-14 10:43:14,255 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 10:43:14,256 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 10:43:14,257 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 10:43:14,257 INFO L85 PathProgramCache]: Analyzing trace with hash 169705396, now seen corresponding path program 1 times [2022-12-14 10:43:14,258 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 10:43:14,258 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1217919110] [2022-12-14 10:43:14,258 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 10:43:14,259 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 10:43:14,291 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 10:43:14,423 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 21 proven. 2 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2022-12-14 10:43:14,423 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 10:43:14,424 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1217919110] [2022-12-14 10:43:14,424 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1217919110] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 10:43:14,424 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1491161822] [2022-12-14 10:43:14,424 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 10:43:14,424 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 10:43:14,425 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 10:43:14,426 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 10:43:14,427 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-12-14 10:43:14,471 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 10:43:14,471 INFO L263 TraceCheckSpWp]: Trace formula consists of 139 conjuncts, 6 conjunts are in the unsatisfiable core [2022-12-14 10:43:14,473 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 10:43:14,500 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 20 proven. 5 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2022-12-14 10:43:14,500 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 10:43:14,597 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 20 proven. 6 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2022-12-14 10:43:14,598 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1491161822] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 10:43:14,598 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1526361704] [2022-12-14 10:43:14,600 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2022-12-14 10:43:14,600 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 10:43:14,601 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:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) 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) [2022-12-14 10:43:14,601 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 10:43:14,601 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 7] total 10 [2022-12-14 10:43:14,601 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [242242229] [2022-12-14 10:43:14,601 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 10:43:14,602 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-12-14 10:43:14,602 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 10:43:14,602 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-12-14 10:43:14,603 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=63, Unknown=0, NotChecked=0, Total=90 [2022-12-14 10:43:14,603 INFO L87 Difference]: Start difference. First operand 28 states and 38 transitions. Second operand has 10 states, 9 states have (on average 3.5555555555555554) internal successors, (32), 10 states have internal predecessors, (32), 5 states have call successors, (7), 1 states have call predecessors, (7), 4 states have return successors, (8), 5 states have call predecessors, (8), 5 states have call successors, (8) [2022-12-14 10:43:14,686 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 10:43:14,686 INFO L93 Difference]: Finished difference Result 56 states and 82 transitions. [2022-12-14 10:43:14,687 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-12-14 10:43:14,687 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 9 states have (on average 3.5555555555555554) internal successors, (32), 10 states have internal predecessors, (32), 5 states have call successors, (7), 1 states have call predecessors, (7), 4 states have return successors, (8), 5 states have call predecessors, (8), 5 states have call successors, (8) Word has length 39 [2022-12-14 10:43:14,687 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 10:43:14,688 INFO L225 Difference]: With dead ends: 56 [2022-12-14 10:43:14,688 INFO L226 Difference]: Without dead ends: 24 [2022-12-14 10:43:14,688 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 74 SyntacticMatches, 3 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=81, Invalid=159, Unknown=0, NotChecked=0, Total=240 [2022-12-14 10:43:14,689 INFO L413 NwaCegarLoop]: 18 mSDtfsCounter, 19 mSDsluCounter, 40 mSDsCounter, 0 mSdLazyCounter, 63 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 58 SdHoareTripleChecker+Invalid, 86 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 63 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 10:43:14,689 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [19 Valid, 58 Invalid, 86 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 63 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 10:43:14,690 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2022-12-14 10:43:14,693 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2022-12-14 10:43:14,694 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 16 states have (on average 1.0625) internal successors, (17), 17 states have internal predecessors, (17), 4 states have call successors, (4), 1 states have call predecessors, (4), 3 states have return successors, (8), 5 states have call predecessors, (8), 4 states have call successors, (8) [2022-12-14 10:43:14,694 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 29 transitions. [2022-12-14 10:43:14,694 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 29 transitions. Word has length 39 [2022-12-14 10:43:14,695 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 10:43:14,695 INFO L495 AbstractCegarLoop]: Abstraction has 24 states and 29 transitions. [2022-12-14 10:43:14,695 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 9 states have (on average 3.5555555555555554) internal successors, (32), 10 states have internal predecessors, (32), 5 states have call successors, (7), 1 states have call predecessors, (7), 4 states have return successors, (8), 5 states have call predecessors, (8), 5 states have call successors, (8) [2022-12-14 10:43:14,695 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 29 transitions. [2022-12-14 10:43:14,696 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2022-12-14 10:43:14,696 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 10:43:14,696 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 5, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 10:43:14,700 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2022-12-14 10:43:14,897 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 10:43:14,897 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 10:43:14,898 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 10:43:14,906 INFO L85 PathProgramCache]: Analyzing trace with hash 735115528, now seen corresponding path program 4 times [2022-12-14 10:43:14,906 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 10:43:14,907 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1328992757] [2022-12-14 10:43:14,907 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 10:43:14,907 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 10:43:14,961 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 10:43:15,458 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 4 proven. 42 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-12-14 10:43:15,458 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 10:43:15,458 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1328992757] [2022-12-14 10:43:15,458 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1328992757] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 10:43:15,458 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [391389989] [2022-12-14 10:43:15,459 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 10:43:15,459 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 10:43:15,459 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 10:43:15,460 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 10:43:15,461 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-12-14 10:43:15,502 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 10:43:15,503 INFO L263 TraceCheckSpWp]: Trace formula consists of 140 conjuncts, 60 conjunts are in the unsatisfiable core [2022-12-14 10:43:15,506 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 10:43:15,932 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 7 proven. 31 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2022-12-14 10:43:15,932 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 10:43:16,869 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 9 proven. 37 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-12-14 10:43:16,869 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [391389989] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 10:43:16,869 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1717418428] [2022-12-14 10:43:16,871 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-12-14 10:43:16,871 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 10:43:16,871 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:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) 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) [2022-12-14 10:43:16,871 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 10:43:16,871 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 18, 22] total 48 [2022-12-14 10:43:16,872 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1299587520] [2022-12-14 10:43:16,872 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 10:43:16,872 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 48 states [2022-12-14 10:43:16,872 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 10:43:16,873 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2022-12-14 10:43:16,874 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=193, Invalid=2063, Unknown=0, NotChecked=0, Total=2256 [2022-12-14 10:43:16,874 INFO L87 Difference]: Start difference. First operand 24 states and 29 transitions. Second operand has 48 states, 43 states have (on average 1.5348837209302326) internal successors, (66), 34 states have internal predecessors, (66), 12 states have call successors, (12), 1 states have call predecessors, (12), 8 states have return successors, (15), 14 states have call predecessors, (15), 12 states have call successors, (15) [2022-12-14 10:43:17,510 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 10:43:17,511 INFO L93 Difference]: Finished difference Result 45 states and 55 transitions. [2022-12-14 10:43:17,511 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2022-12-14 10:43:17,511 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 43 states have (on average 1.5348837209302326) internal successors, (66), 34 states have internal predecessors, (66), 12 states have call successors, (12), 1 states have call predecessors, (12), 8 states have return successors, (15), 14 states have call predecessors, (15), 12 states have call successors, (15) Word has length 40 [2022-12-14 10:43:17,512 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 10:43:17,512 INFO L225 Difference]: With dead ends: 45 [2022-12-14 10:43:17,513 INFO L226 Difference]: Without dead ends: 39 [2022-12-14 10:43:17,514 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 113 GetRequests, 47 SyntacticMatches, 5 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 870 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=434, Invalid=3472, Unknown=0, NotChecked=0, Total=3906 [2022-12-14 10:43:17,515 INFO L413 NwaCegarLoop]: 13 mSDtfsCounter, 75 mSDsluCounter, 180 mSDsCounter, 0 mSdLazyCounter, 729 mSolverCounterSat, 65 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 84 SdHoareTripleChecker+Valid, 193 SdHoareTripleChecker+Invalid, 794 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 65 IncrementalHoareTripleChecker+Valid, 729 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-12-14 10:43:17,515 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [84 Valid, 193 Invalid, 794 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [65 Valid, 729 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-12-14 10:43:17,515 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2022-12-14 10:43:17,518 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 31. [2022-12-14 10:43:17,518 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 21 states have (on average 1.0952380952380953) internal successors, (23), 22 states have internal predecessors, (23), 5 states have call successors, (5), 2 states have call predecessors, (5), 4 states have return successors, (12), 6 states have call predecessors, (12), 5 states have call successors, (12) [2022-12-14 10:43:17,519 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 40 transitions. [2022-12-14 10:43:17,519 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 40 transitions. Word has length 40 [2022-12-14 10:43:17,519 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 10:43:17,519 INFO L495 AbstractCegarLoop]: Abstraction has 31 states and 40 transitions. [2022-12-14 10:43:17,519 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 48 states, 43 states have (on average 1.5348837209302326) internal successors, (66), 34 states have internal predecessors, (66), 12 states have call successors, (12), 1 states have call predecessors, (12), 8 states have return successors, (15), 14 states have call predecessors, (15), 12 states have call successors, (15) [2022-12-14 10:43:17,519 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 40 transitions. [2022-12-14 10:43:17,520 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2022-12-14 10:43:17,520 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 10:43:17,520 INFO L195 NwaCegarLoop]: trace histogram [7, 7, 7, 5, 5, 5, 5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 10:43:17,524 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2022-12-14 10:43:17,721 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 10:43:17,722 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 10:43:17,723 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 10:43:17,723 INFO L85 PathProgramCache]: Analyzing trace with hash -1490504886, now seen corresponding path program 5 times [2022-12-14 10:43:17,724 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 10:43:17,724 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [288636629] [2022-12-14 10:43:17,724 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 10:43:17,725 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 10:43:17,764 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 10:43:18,461 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2022-12-14 10:43:18,461 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 10:43:18,461 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [288636629] [2022-12-14 10:43:18,461 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [288636629] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 10:43:18,461 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [532152921] [2022-12-14 10:43:18,461 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 10:43:18,462 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 10:43:18,462 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 10:43:18,462 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 10:43:18,463 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-12-14 10:43:18,502 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2022-12-14 10:43:18,502 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 10:43:18,504 INFO L263 TraceCheckSpWp]: Trace formula consists of 178 conjuncts, 85 conjunts are in the unsatisfiable core [2022-12-14 10:43:18,506 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 10:43:18,963 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 3 proven. 61 refuted. 0 times theorem prover too weak. 61 trivial. 0 not checked. [2022-12-14 10:43:18,963 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 10:43:20,327 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 20 proven. 80 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2022-12-14 10:43:20,327 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [532152921] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 10:43:20,327 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [741559563] [2022-12-14 10:43:20,329 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-12-14 10:43:20,329 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 10:43:20,329 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:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) 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) [2022-12-14 10:43:20,330 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 10:43:20,330 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 16, 24] total 57 [2022-12-14 10:43:20,330 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [86685921] [2022-12-14 10:43:20,330 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 10:43:20,331 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 57 states [2022-12-14 10:43:20,331 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 10:43:20,332 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2022-12-14 10:43:20,334 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=195, Invalid=2997, Unknown=0, NotChecked=0, Total=3192 [2022-12-14 10:43:20,334 INFO L87 Difference]: Start difference. First operand 31 states and 40 transitions. Second operand has 57 states, 52 states have (on average 1.5) internal successors, (78), 39 states have internal predecessors, (78), 15 states have call successors, (15), 1 states have call predecessors, (15), 12 states have return successors, (19), 18 states have call predecessors, (19), 15 states have call successors, (19) [2022-12-14 10:43:21,583 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 10:43:21,583 INFO L93 Difference]: Finished difference Result 56 states and 75 transitions. [2022-12-14 10:43:21,583 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2022-12-14 10:43:21,583 INFO L78 Accepts]: Start accepts. Automaton has has 57 states, 52 states have (on average 1.5) internal successors, (78), 39 states have internal predecessors, (78), 15 states have call successors, (15), 1 states have call predecessors, (15), 12 states have return successors, (19), 18 states have call predecessors, (19), 15 states have call successors, (19) Word has length 54 [2022-12-14 10:43:21,584 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 10:43:21,585 INFO L225 Difference]: With dead ends: 56 [2022-12-14 10:43:21,585 INFO L226 Difference]: Without dead ends: 48 [2022-12-14 10:43:21,586 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 156 GetRequests, 74 SyntacticMatches, 6 SemanticMatches, 76 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1309 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=592, Invalid=5414, Unknown=0, NotChecked=0, Total=6006 [2022-12-14 10:43:21,587 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 157 mSDsluCounter, 321 mSDsCounter, 0 mSdLazyCounter, 1230 mSolverCounterSat, 129 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 161 SdHoareTripleChecker+Valid, 338 SdHoareTripleChecker+Invalid, 1359 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 129 IncrementalHoareTripleChecker+Valid, 1230 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-12-14 10:43:21,587 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [161 Valid, 338 Invalid, 1359 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [129 Valid, 1230 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-12-14 10:43:21,587 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2022-12-14 10:43:21,592 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 34. [2022-12-14 10:43:21,593 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 23 states have (on average 1.0869565217391304) internal successors, (25), 24 states have internal predecessors, (25), 5 states have call successors, (5), 2 states have call predecessors, (5), 5 states have return successors, (14), 7 states have call predecessors, (14), 5 states have call successors, (14) [2022-12-14 10:43:21,593 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 44 transitions. [2022-12-14 10:43:21,593 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 44 transitions. Word has length 54 [2022-12-14 10:43:21,594 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 10:43:21,594 INFO L495 AbstractCegarLoop]: Abstraction has 34 states and 44 transitions. [2022-12-14 10:43:21,594 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 57 states, 52 states have (on average 1.5) internal successors, (78), 39 states have internal predecessors, (78), 15 states have call successors, (15), 1 states have call predecessors, (15), 12 states have return successors, (19), 18 states have call predecessors, (19), 15 states have call successors, (19) [2022-12-14 10:43:21,594 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 44 transitions. [2022-12-14 10:43:21,595 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2022-12-14 10:43:21,595 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 10:43:21,595 INFO L195 NwaCegarLoop]: trace histogram [9, 9, 9, 7, 7, 7, 7, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 10:43:21,599 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2022-12-14 10:43:21,795 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 10:43:21,797 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 10:43:21,797 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 10:43:21,798 INFO L85 PathProgramCache]: Analyzing trace with hash -71623192, now seen corresponding path program 6 times [2022-12-14 10:43:21,798 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 10:43:21,798 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1176567870] [2022-12-14 10:43:21,799 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 10:43:21,799 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 10:43:21,831 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 10:43:22,845 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 0 proven. 182 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2022-12-14 10:43:22,846 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 10:43:22,846 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1176567870] [2022-12-14 10:43:22,846 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1176567870] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 10:43:22,846 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1908558493] [2022-12-14 10:43:22,846 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 10:43:22,846 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 10:43:22,846 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 10:43:22,847 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 10:43:22,848 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-12-14 10:43:22,894 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 10:43:22,894 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 10:43:22,897 WARN L261 TraceCheckSpWp]: Trace formula consists of 216 conjuncts, 109 conjunts are in the unsatisfiable core [2022-12-14 10:43:22,899 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 10:43:23,576 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 4 proven. 106 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2022-12-14 10:43:23,576 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 10:43:26,001 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1908558493] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 10:43:26,001 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [876444318] [2022-12-14 10:43:26,003 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-12-14 10:43:26,003 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 10:43:26,003 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:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) 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) [2022-12-14 10:43:26,003 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-12-14 10:43:26,004 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 18] total 49 [2022-12-14 10:43:26,004 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1524369835] [2022-12-14 10:43:26,004 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-12-14 10:43:26,004 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 49 states [2022-12-14 10:43:26,004 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 10:43:26,005 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2022-12-14 10:43:26,005 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=245, Invalid=4585, Unknown=0, NotChecked=0, Total=4830 [2022-12-14 10:43:26,005 INFO L87 Difference]: Start difference. First operand 34 states and 44 transitions. Second operand has 49 states, 45 states have (on average 1.4222222222222223) internal successors, (64), 34 states have internal predecessors, (64), 11 states have call successors, (11), 1 states have call predecessors, (11), 13 states have return successors, (15), 15 states have call predecessors, (15), 11 states have call successors, (15) [2022-12-14 10:43:26,920 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 10:43:26,920 INFO L93 Difference]: Finished difference Result 49 states and 64 transitions. [2022-12-14 10:43:26,920 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2022-12-14 10:43:26,920 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 45 states have (on average 1.4222222222222223) internal successors, (64), 34 states have internal predecessors, (64), 11 states have call successors, (11), 1 states have call predecessors, (11), 13 states have return successors, (15), 15 states have call predecessors, (15), 11 states have call successors, (15) Word has length 68 [2022-12-14 10:43:26,920 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 10:43:26,921 INFO L225 Difference]: With dead ends: 49 [2022-12-14 10:43:26,921 INFO L226 Difference]: Without dead ends: 43 [2022-12-14 10:43:26,922 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 168 GetRequests, 79 SyntacticMatches, 6 SemanticMatches, 83 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1475 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=614, Invalid=6526, Unknown=0, NotChecked=0, Total=7140 [2022-12-14 10:43:26,922 INFO L413 NwaCegarLoop]: 15 mSDtfsCounter, 75 mSDsluCounter, 269 mSDsCounter, 0 mSdLazyCounter, 908 mSolverCounterSat, 38 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 76 SdHoareTripleChecker+Valid, 284 SdHoareTripleChecker+Invalid, 946 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 38 IncrementalHoareTripleChecker+Valid, 908 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-12-14 10:43:26,922 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [76 Valid, 284 Invalid, 946 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [38 Valid, 908 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-12-14 10:43:26,923 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2022-12-14 10:43:26,927 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 39. [2022-12-14 10:43:26,927 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39 states, 26 states have (on average 1.0769230769230769) internal successors, (28), 27 states have internal predecessors, (28), 6 states have call successors, (6), 2 states have call predecessors, (6), 6 states have return successors, (20), 9 states have call predecessors, (20), 6 states have call successors, (20) [2022-12-14 10:43:26,927 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 54 transitions. [2022-12-14 10:43:26,928 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 54 transitions. Word has length 68 [2022-12-14 10:43:26,928 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 10:43:26,928 INFO L495 AbstractCegarLoop]: Abstraction has 39 states and 54 transitions. [2022-12-14 10:43:26,928 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 49 states, 45 states have (on average 1.4222222222222223) internal successors, (64), 34 states have internal predecessors, (64), 11 states have call successors, (11), 1 states have call predecessors, (11), 13 states have return successors, (15), 15 states have call predecessors, (15), 11 states have call successors, (15) [2022-12-14 10:43:26,928 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 54 transitions. [2022-12-14 10:43:26,929 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2022-12-14 10:43:26,929 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 10:43:26,929 INFO L195 NwaCegarLoop]: trace histogram [10, 10, 10, 8, 8, 8, 8, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 10:43:26,933 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2022-12-14 10:43:27,129 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 10:43:27,130 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 10:43:27,130 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 10:43:27,130 INFO L85 PathProgramCache]: Analyzing trace with hash 1265942364, now seen corresponding path program 7 times [2022-12-14 10:43:27,130 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 10:43:27,130 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [264670915] [2022-12-14 10:43:27,130 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 10:43:27,130 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 10:43:27,142 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 10:43:28,042 INFO L134 CoverageAnalysis]: Checked inductivity of 281 backedges. 0 proven. 232 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2022-12-14 10:43:28,042 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 10:43:28,042 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [264670915] [2022-12-14 10:43:28,042 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [264670915] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 10:43:28,042 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [464297567] [2022-12-14 10:43:28,042 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 10:43:28,043 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 10:43:28,043 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 10:43:28,043 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 10:43:28,044 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-12-14 10:43:28,093 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 10:43:28,096 WARN L261 TraceCheckSpWp]: Trace formula consists of 235 conjuncts, 121 conjunts are in the unsatisfiable core [2022-12-14 10:43:28,098 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 10:43:28,932 INFO L134 CoverageAnalysis]: Checked inductivity of 281 backedges. 5 proven. 134 refuted. 0 times theorem prover too weak. 142 trivial. 0 not checked. [2022-12-14 10:43:28,932 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 10:43:31,870 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [464297567] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 10:43:31,870 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1182995925] [2022-12-14 10:43:31,872 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-12-14 10:43:31,872 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 10:43:31,873 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:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) 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) [2022-12-14 10:43:31,873 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-12-14 10:43:31,873 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 20] total 54 [2022-12-14 10:43:31,873 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [101661414] [2022-12-14 10:43:31,873 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-12-14 10:43:31,874 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 54 states [2022-12-14 10:43:31,874 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 10:43:31,874 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2022-12-14 10:43:31,875 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=269, Invalid=5583, Unknown=0, NotChecked=0, Total=5852 [2022-12-14 10:43:31,875 INFO L87 Difference]: Start difference. First operand 39 states and 54 transitions. Second operand has 54 states, 50 states have (on average 1.42) internal successors, (71), 37 states have internal predecessors, (71), 12 states have call successors, (12), 1 states have call predecessors, (12), 15 states have return successors, (17), 17 states have call predecessors, (17), 12 states have call successors, (17) [2022-12-14 10:43:32,947 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 10:43:32,947 INFO L93 Difference]: Finished difference Result 50 states and 68 transitions. [2022-12-14 10:43:32,947 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2022-12-14 10:43:32,947 INFO L78 Accepts]: Start accepts. Automaton has has 54 states, 50 states have (on average 1.42) internal successors, (71), 37 states have internal predecessors, (71), 12 states have call successors, (12), 1 states have call predecessors, (12), 15 states have return successors, (17), 17 states have call predecessors, (17), 12 states have call successors, (17) Word has length 75 [2022-12-14 10:43:32,948 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 10:43:32,949 INFO L225 Difference]: With dead ends: 50 [2022-12-14 10:43:32,949 INFO L226 Difference]: Without dead ends: 46 [2022-12-14 10:43:32,952 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 185 GetRequests, 88 SyntacticMatches, 7 SemanticMatches, 90 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1743 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=713, Invalid=7659, Unknown=0, NotChecked=0, Total=8372 [2022-12-14 10:43:32,953 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 105 mSDsluCounter, 350 mSDsCounter, 0 mSdLazyCounter, 1176 mSolverCounterSat, 50 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 106 SdHoareTripleChecker+Valid, 366 SdHoareTripleChecker+Invalid, 1226 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 50 IncrementalHoareTripleChecker+Valid, 1176 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-12-14 10:43:32,953 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [106 Valid, 366 Invalid, 1226 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [50 Valid, 1176 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-12-14 10:43:32,954 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2022-12-14 10:43:32,961 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 42. [2022-12-14 10:43:32,961 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 28 states have (on average 1.0714285714285714) internal successors, (30), 29 states have internal predecessors, (30), 6 states have call successors, (6), 2 states have call predecessors, (6), 7 states have return successors, (25), 10 states have call predecessors, (25), 6 states have call successors, (25) [2022-12-14 10:43:32,962 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 61 transitions. [2022-12-14 10:43:32,962 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 61 transitions. Word has length 75 [2022-12-14 10:43:32,963 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 10:43:32,963 INFO L495 AbstractCegarLoop]: Abstraction has 42 states and 61 transitions. [2022-12-14 10:43:32,963 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 54 states, 50 states have (on average 1.42) internal successors, (71), 37 states have internal predecessors, (71), 12 states have call successors, (12), 1 states have call predecessors, (12), 15 states have return successors, (17), 17 states have call predecessors, (17), 12 states have call successors, (17) [2022-12-14 10:43:32,963 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 61 transitions. [2022-12-14 10:43:32,964 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2022-12-14 10:43:32,964 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 10:43:32,964 INFO L195 NwaCegarLoop]: trace histogram [7, 7, 7, 5, 5, 5, 5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 10:43:32,969 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2022-12-14 10:43:33,165 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2022-12-14 10:43:33,166 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 10:43:33,167 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 10:43:33,167 INFO L85 PathProgramCache]: Analyzing trace with hash -1552582568, now seen corresponding path program 8 times [2022-12-14 10:43:33,167 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 10:43:33,168 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [627116085] [2022-12-14 10:43:33,168 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 10:43:33,168 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 10:43:33,193 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 10:43:33,720 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 4 proven. 100 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2022-12-14 10:43:33,720 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 10:43:33,720 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [627116085] [2022-12-14 10:43:33,720 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [627116085] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 10:43:33,720 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [417714077] [2022-12-14 10:43:33,720 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 10:43:33,720 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 10:43:33,721 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 10:43:33,721 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 10:43:33,722 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-12-14 10:43:33,780 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2022-12-14 10:43:33,780 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 10:43:33,782 INFO L263 TraceCheckSpWp]: Trace formula consists of 178 conjuncts, 81 conjunts are in the unsatisfiable core [2022-12-14 10:43:33,783 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 10:43:34,310 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 27 proven. 59 refuted. 0 times theorem prover too weak. 39 trivial. 0 not checked. [2022-12-14 10:43:34,310 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 10:43:36,016 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 8 proven. 96 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2022-12-14 10:43:36,017 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [417714077] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 10:43:36,017 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1684440217] [2022-12-14 10:43:36,018 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-12-14 10:43:36,019 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 10:43:36,019 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:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) 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) [2022-12-14 10:43:36,019 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 10:43:36,019 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 23, 26] total 65 [2022-12-14 10:43:36,019 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [430917404] [2022-12-14 10:43:36,019 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 10:43:36,020 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 65 states [2022-12-14 10:43:36,020 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 10:43:36,021 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 65 interpolants. [2022-12-14 10:43:36,023 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=227, Invalid=3933, Unknown=0, NotChecked=0, Total=4160 [2022-12-14 10:43:36,023 INFO L87 Difference]: Start difference. First operand 42 states and 61 transitions. Second operand has 65 states, 62 states have (on average 1.532258064516129) internal successors, (95), 44 states have internal predecessors, (95), 16 states have call successors, (16), 1 states have call predecessors, (16), 17 states have return successors, (21), 21 states have call predecessors, (21), 16 states have call successors, (21) [2022-12-14 10:43:37,446 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 10:43:37,446 INFO L93 Difference]: Finished difference Result 84 states and 115 transitions. [2022-12-14 10:43:37,446 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2022-12-14 10:43:37,446 INFO L78 Accepts]: Start accepts. Automaton has has 65 states, 62 states have (on average 1.532258064516129) internal successors, (95), 44 states have internal predecessors, (95), 16 states have call successors, (16), 1 states have call predecessors, (16), 17 states have return successors, (21), 21 states have call predecessors, (21), 16 states have call successors, (21) Word has length 54 [2022-12-14 10:43:37,447 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 10:43:37,448 INFO L225 Difference]: With dead ends: 84 [2022-12-14 10:43:37,448 INFO L226 Difference]: Without dead ends: 78 [2022-12-14 10:43:37,452 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 157 GetRequests, 66 SyntacticMatches, 3 SemanticMatches, 88 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1628 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=787, Invalid=7223, Unknown=0, NotChecked=0, Total=8010 [2022-12-14 10:43:37,453 INFO L413 NwaCegarLoop]: 21 mSDtfsCounter, 127 mSDsluCounter, 488 mSDsCounter, 0 mSdLazyCounter, 1424 mSolverCounterSat, 140 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 133 SdHoareTripleChecker+Valid, 509 SdHoareTripleChecker+Invalid, 1564 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 140 IncrementalHoareTripleChecker+Valid, 1424 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-12-14 10:43:37,453 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [133 Valid, 509 Invalid, 1564 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [140 Valid, 1424 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-12-14 10:43:37,454 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2022-12-14 10:43:37,462 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 66. [2022-12-14 10:43:37,462 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 66 states, 44 states have (on average 1.0909090909090908) internal successors, (48), 45 states have internal predecessors, (48), 10 states have call successors, (10), 4 states have call predecessors, (10), 11 states have return successors, (38), 16 states have call predecessors, (38), 10 states have call successors, (38) [2022-12-14 10:43:37,462 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 96 transitions. [2022-12-14 10:43:37,462 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 96 transitions. Word has length 54 [2022-12-14 10:43:37,462 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 10:43:37,463 INFO L495 AbstractCegarLoop]: Abstraction has 66 states and 96 transitions. [2022-12-14 10:43:37,463 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 65 states, 62 states have (on average 1.532258064516129) internal successors, (95), 44 states have internal predecessors, (95), 16 states have call successors, (16), 1 states have call predecessors, (16), 17 states have return successors, (21), 21 states have call predecessors, (21), 16 states have call successors, (21) [2022-12-14 10:43:37,463 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 96 transitions. [2022-12-14 10:43:37,463 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2022-12-14 10:43:37,463 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 10:43:37,463 INFO L195 NwaCegarLoop]: trace histogram [11, 11, 11, 9, 9, 9, 9, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 10:43:37,469 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Ended with exit code 0 [2022-12-14 10:43:37,664 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2022-12-14 10:43:37,665 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 10:43:37,666 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 10:43:37,666 INFO L85 PathProgramCache]: Analyzing trace with hash 510736696, now seen corresponding path program 9 times [2022-12-14 10:43:37,667 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 10:43:37,667 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [847539032] [2022-12-14 10:43:37,667 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 10:43:37,667 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 10:43:37,701 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 10:43:38,878 INFO L134 CoverageAnalysis]: Checked inductivity of 347 backedges. 1 proven. 287 refuted. 0 times theorem prover too weak. 59 trivial. 0 not checked. [2022-12-14 10:43:38,879 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 10:43:38,879 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [847539032] [2022-12-14 10:43:38,879 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [847539032] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 10:43:38,879 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [348735793] [2022-12-14 10:43:38,879 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 10:43:38,879 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 10:43:38,879 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 10:43:38,880 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 10:43:38,881 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-12-14 10:43:38,935 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 10:43:38,935 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 10:43:38,937 WARN L261 TraceCheckSpWp]: Trace formula consists of 254 conjuncts, 133 conjunts are in the unsatisfiable core [2022-12-14 10:43:38,939 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 10:43:40,079 INFO L134 CoverageAnalysis]: Checked inductivity of 347 backedges. 6 proven. 165 refuted. 0 times theorem prover too weak. 176 trivial. 0 not checked. [2022-12-14 10:43:40,079 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 10:43:49,482 WARN L837 $PredicateComparison]: unable to prove that (and (forall ((|aux_div_aux_mod_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_76_47_48_65_80| Int) (|aux_div_aux_mod_aux_mod_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_76_47_48_65_80_87| Int) (aux_div_v_mult_~n_BEFORE_CALL_76_146 Int) (aux_div_aux_mod_aux_mod_v_mult_~n_BEFORE_CALL_76_146_553_215 Int) (|aux_div_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_76_47_48_65| Int) (|aux_mod_aux_mod_aux_mod_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_76_47_48_65_80_87| Int) (|aux_div_aux_mod_v_mult_#in~n_BEFORE_CALL_76_47_48| Int) (aux_div_aux_mod_v_mult_~n_BEFORE_CALL_76_146_553 Int) (|aux_div_v_mult_#in~n_BEFORE_CALL_76_47| Int)) (let ((.cse8 (* |aux_div_aux_mod_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_76_47_48_65_80| 2)) (.cse11 (* |aux_div_aux_mod_v_mult_#in~n_BEFORE_CALL_76_47_48| 2)) (.cse9 (* 2 |aux_div_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_76_47_48_65|)) (.cse10 (* |aux_div_aux_mod_aux_mod_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_76_47_48_65_80_87| 2))) (let ((.cse12 (+ .cse8 .cse11 .cse9 .cse10 |aux_mod_aux_mod_aux_mod_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_76_47_48_65_80_87|)) (.cse6 (* 16 aux_div_v_mult_~n_BEFORE_CALL_76_146)) (.cse0 (* |aux_div_aux_mod_aux_mod_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_76_47_48_65_80_87| 16)) (.cse1 (* |aux_div_v_mult_#in~n_BEFORE_CALL_76_47| 16)) (.cse3 (* 16 |aux_div_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_76_47_48_65|)) (.cse4 (* |aux_div_aux_mod_v_mult_#in~n_BEFORE_CALL_76_47_48| 16)) (.cse5 (* |aux_div_aux_mod_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_76_47_48_65_80| 16)) (.cse2 (* 16 aux_div_aux_mod_aux_mod_v_mult_~n_BEFORE_CALL_76_146_553_215)) (.cse13 (* 6 aux_div_aux_mod_v_mult_~n_BEFORE_CALL_76_146_553)) (.cse14 (* |aux_mod_aux_mod_aux_mod_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_76_47_48_65_80_87| 8)) (.cse7 (+ .cse10 |aux_mod_aux_mod_aux_mod_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_76_47_48_65_80_87|))) (or (<= (+ 6 |aux_mod_aux_mod_aux_mod_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_76_47_48_65_80_87|) (* 2 aux_div_aux_mod_v_mult_~n_BEFORE_CALL_76_146_553)) (< (+ .cse0 .cse1 .cse2 .cse3 .cse4 15 .cse5 |c_mult_#res|) .cse6) (>= |aux_mod_aux_mod_aux_mod_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_76_47_48_65_80_87| 2) (< .cse7 3) (<= 5 (+ .cse8 .cse9 .cse10 |aux_mod_aux_mod_aux_mod_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_76_47_48_65_80_87|)) (< (+ (* 3 aux_div_v_mult_~n_BEFORE_CALL_76_146) 1) (+ .cse8 .cse11 .cse9 .cse10 |aux_mod_aux_mod_aux_mod_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_76_47_48_65_80_87| (* |aux_div_v_mult_#in~n_BEFORE_CALL_76_47| 3))) (< |aux_div_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_76_47_48_65| (+ .cse8 2 .cse10 |aux_mod_aux_mod_aux_mod_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_76_47_48_65_80_87|)) (< .cse12 3) (<= 5 .cse12) (< (+ .cse6 20 .cse13) (+ .cse0 .cse1 .cse14 .cse3 .cse4 .cse5 |c_mult_#res|)) (<= |aux_mod_aux_mod_aux_mod_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_76_47_48_65_80_87| (+ (* 3 aux_div_aux_mod_aux_mod_v_mult_~n_BEFORE_CALL_76_146_553_215) |aux_div_aux_mod_aux_mod_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_76_47_48_65_80_87| 1)) (< (+ .cse8 .cse10 |aux_mod_aux_mod_aux_mod_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_76_47_48_65_80_87|) 0) (< (+ .cse2 20 .cse13) .cse14) (<= 5 .cse7))))) (<= |c_mult_#in~m| 0) (forall ((|aux_div_aux_mod_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_76_37_48_59_80| Int) (|aux_div_aux_mod_v_mult_#in~n_BEFORE_CALL_76_37_48| Int) (aux_div_aux_mod_aux_mod_v_mult_~n_BEFORE_CALL_76_150_181_182 Int) (|aux_div_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_76_37_48_59| Int) (aux_div_aux_mod_v_mult_~n_BEFORE_CALL_76_150_181 Int)) (let ((.cse16 (* 2 |aux_div_aux_mod_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_76_37_48_59_80|)) (.cse15 (* 2 |aux_div_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_76_37_48_59|)) (.cse19 (* aux_div_aux_mod_aux_mod_v_mult_~n_BEFORE_CALL_76_150_181_182 2)) (.cse18 (div (+ (- 13) (- |c_mult_#res|)) 6)) (.cse17 (* |aux_div_aux_mod_v_mult_#in~n_BEFORE_CALL_76_37_48| 2))) (or (< 0 (+ .cse15 .cse16 3 .cse17)) (< (+ (* 16 aux_div_aux_mod_v_mult_~n_BEFORE_CALL_76_150_181) (* aux_div_aux_mod_aux_mod_v_mult_~n_BEFORE_CALL_76_150_181_182 6) 38 |c_mult_#res| (* .cse18 6)) (* 16 |aux_div_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_76_37_48_59|)) (< (+ |aux_div_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_76_37_48_59| |aux_div_aux_mod_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_76_37_48_59_80|) (+ (* 3 aux_div_aux_mod_v_mult_~n_BEFORE_CALL_76_150_181) 2 .cse17)) (< (+ .cse15 .cse16 4) 0) (< 5 (+ .cse19 .cse15 .cse17)) (< (+ .cse15 .cse17 1) 0) (< (+ .cse19 (* .cse18 2) .cse17) 0) (< (+ .cse17 1) 0)))) (not (< |c_mult_#in~m| 0))) is different from false [2022-12-14 10:43:50,242 INFO L134 CoverageAnalysis]: Checked inductivity of 347 backedges. 35 proven. 244 refuted. 0 times theorem prover too weak. 58 trivial. 10 not checked. [2022-12-14 10:43:50,242 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [348735793] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 10:43:50,242 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [863480232] [2022-12-14 10:43:50,243 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-12-14 10:43:50,243 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 10:43:50,244 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:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) 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) [2022-12-14 10:43:50,244 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 10:43:50,244 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 22, 38] total 86 [2022-12-14 10:43:50,244 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1472147145] [2022-12-14 10:43:50,244 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 10:43:50,245 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 86 states [2022-12-14 10:43:50,245 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 10:43:50,246 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 86 interpolants. [2022-12-14 10:43:50,247 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=301, Invalid=6839, Unknown=4, NotChecked=166, Total=7310 [2022-12-14 10:43:50,248 INFO L87 Difference]: Start difference. First operand 66 states and 96 transitions. Second operand has 86 states, 79 states have (on average 1.5443037974683544) internal successors, (122), 57 states have internal predecessors, (122), 23 states have call successors, (23), 1 states have call predecessors, (23), 21 states have return successors, (30), 29 states have call predecessors, (30), 23 states have call successors, (30) [2022-12-14 10:43:52,848 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 10:43:52,848 INFO L93 Difference]: Finished difference Result 87 states and 132 transitions. [2022-12-14 10:43:52,848 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2022-12-14 10:43:52,848 INFO L78 Accepts]: Start accepts. Automaton has has 86 states, 79 states have (on average 1.5443037974683544) internal successors, (122), 57 states have internal predecessors, (122), 23 states have call successors, (23), 1 states have call predecessors, (23), 21 states have return successors, (30), 29 states have call predecessors, (30), 23 states have call successors, (30) Word has length 82 [2022-12-14 10:43:52,848 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 10:43:52,849 INFO L225 Difference]: With dead ends: 87 [2022-12-14 10:43:52,849 INFO L226 Difference]: Without dead ends: 81 [2022-12-14 10:43:52,851 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 229 GetRequests, 110 SyntacticMatches, 10 SemanticMatches, 109 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 2708 ImplicationChecksByTransitivity, 10.4s TimeCoverageRelationStatistics Valid=1014, Invalid=10976, Unknown=4, NotChecked=216, Total=12210 [2022-12-14 10:43:52,852 INFO L413 NwaCegarLoop]: 21 mSDtfsCounter, 264 mSDsluCounter, 555 mSDsCounter, 0 mSdLazyCounter, 2061 mSolverCounterSat, 176 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 266 SdHoareTripleChecker+Valid, 576 SdHoareTripleChecker+Invalid, 2305 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 176 IncrementalHoareTripleChecker+Valid, 2061 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 68 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2022-12-14 10:43:52,852 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [266 Valid, 576 Invalid, 2305 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [176 Valid, 2061 Invalid, 0 Unknown, 68 Unchecked, 1.2s Time] [2022-12-14 10:43:52,853 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2022-12-14 10:43:52,866 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 73. [2022-12-14 10:43:52,866 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 73 states, 49 states have (on average 1.1020408163265305) internal successors, (54), 50 states have internal predecessors, (54), 11 states have call successors, (11), 5 states have call predecessors, (11), 12 states have return successors, (43), 17 states have call predecessors, (43), 11 states have call successors, (43) [2022-12-14 10:43:52,867 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 108 transitions. [2022-12-14 10:43:52,867 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 108 transitions. Word has length 82 [2022-12-14 10:43:52,867 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 10:43:52,867 INFO L495 AbstractCegarLoop]: Abstraction has 73 states and 108 transitions. [2022-12-14 10:43:52,868 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 86 states, 79 states have (on average 1.5443037974683544) internal successors, (122), 57 states have internal predecessors, (122), 23 states have call successors, (23), 1 states have call predecessors, (23), 21 states have return successors, (30), 29 states have call predecessors, (30), 23 states have call successors, (30) [2022-12-14 10:43:52,868 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 108 transitions. [2022-12-14 10:43:52,869 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2022-12-14 10:43:52,869 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 10:43:52,869 INFO L195 NwaCegarLoop]: trace histogram [9, 9, 9, 7, 7, 7, 7, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 10:43:52,875 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Ended with exit code 0 [2022-12-14 10:43:53,070 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 10:43:53,071 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 10:43:53,072 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 10:43:53,072 INFO L85 PathProgramCache]: Analyzing trace with hash 1515345786, now seen corresponding path program 10 times [2022-12-14 10:43:53,072 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 10:43:53,072 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [636225827] [2022-12-14 10:43:53,073 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 10:43:53,073 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 10:43:53,105 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 10:43:54,008 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 0 proven. 182 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2022-12-14 10:43:54,008 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 10:43:54,008 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [636225827] [2022-12-14 10:43:54,008 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [636225827] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 10:43:54,008 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [730132000] [2022-12-14 10:43:54,008 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 10:43:54,008 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 10:43:54,008 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 10:43:54,009 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 10:43:54,013 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-12-14 10:43:54,064 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 10:43:54,066 WARN L261 TraceCheckSpWp]: Trace formula consists of 216 conjuncts, 109 conjunts are in the unsatisfiable core [2022-12-14 10:43:54,068 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 10:43:54,888 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 5 proven. 108 refuted. 0 times theorem prover too weak. 109 trivial. 0 not checked. [2022-12-14 10:43:54,888 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 10:43:57,364 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 26 proven. 156 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2022-12-14 10:43:57,364 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [730132000] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 10:43:57,364 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1411927275] [2022-12-14 10:43:57,366 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-12-14 10:43:57,366 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 10:43:57,367 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:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) 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) [2022-12-14 10:43:57,367 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 10:43:57,367 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 20, 30] total 71 [2022-12-14 10:43:57,367 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1958339400] [2022-12-14 10:43:57,367 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 10:43:57,368 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 71 states [2022-12-14 10:43:57,368 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 10:43:57,369 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 71 interpolants. [2022-12-14 10:43:57,370 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=243, Invalid=4727, Unknown=0, NotChecked=0, Total=4970 [2022-12-14 10:43:57,370 INFO L87 Difference]: Start difference. First operand 73 states and 108 transitions. Second operand has 71 states, 66 states have (on average 1.5151515151515151) internal successors, (100), 47 states have internal predecessors, (100), 19 states have call successors, (19), 1 states have call predecessors, (19), 16 states have return successors, (25), 24 states have call predecessors, (25), 19 states have call successors, (25) [2022-12-14 10:43:58,915 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 10:43:58,915 INFO L93 Difference]: Finished difference Result 87 states and 119 transitions. [2022-12-14 10:43:58,915 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2022-12-14 10:43:58,915 INFO L78 Accepts]: Start accepts. Automaton has has 71 states, 66 states have (on average 1.5151515151515151) internal successors, (100), 47 states have internal predecessors, (100), 19 states have call successors, (19), 1 states have call predecessors, (19), 16 states have return successors, (25), 24 states have call predecessors, (25), 19 states have call successors, (25) Word has length 68 [2022-12-14 10:43:58,916 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 10:43:58,916 INFO L225 Difference]: With dead ends: 87 [2022-12-14 10:43:58,916 INFO L226 Difference]: Without dead ends: 81 [2022-12-14 10:43:58,917 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 192 GetRequests, 92 SyntacticMatches, 8 SemanticMatches, 92 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1934 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=808, Invalid=7934, Unknown=0, NotChecked=0, Total=8742 [2022-12-14 10:43:58,917 INFO L413 NwaCegarLoop]: 18 mSDtfsCounter, 158 mSDsluCounter, 377 mSDsCounter, 0 mSdLazyCounter, 1448 mSolverCounterSat, 94 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 161 SdHoareTripleChecker+Valid, 395 SdHoareTripleChecker+Invalid, 1542 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 94 IncrementalHoareTripleChecker+Valid, 1448 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-12-14 10:43:58,918 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [161 Valid, 395 Invalid, 1542 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [94 Valid, 1448 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-12-14 10:43:58,918 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2022-12-14 10:43:58,929 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 67. [2022-12-14 10:43:58,930 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 67 states, 45 states have (on average 1.0888888888888888) internal successors, (49), 46 states have internal predecessors, (49), 9 states have call successors, (9), 4 states have call predecessors, (9), 12 states have return successors, (34), 16 states have call predecessors, (34), 9 states have call successors, (34) [2022-12-14 10:43:58,930 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 92 transitions. [2022-12-14 10:43:58,931 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 92 transitions. Word has length 68 [2022-12-14 10:43:58,931 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 10:43:58,931 INFO L495 AbstractCegarLoop]: Abstraction has 67 states and 92 transitions. [2022-12-14 10:43:58,931 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 71 states, 66 states have (on average 1.5151515151515151) internal successors, (100), 47 states have internal predecessors, (100), 19 states have call successors, (19), 1 states have call predecessors, (19), 16 states have return successors, (25), 24 states have call predecessors, (25), 19 states have call successors, (25) [2022-12-14 10:43:58,931 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 92 transitions. [2022-12-14 10:43:58,932 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2022-12-14 10:43:58,932 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 10:43:58,932 INFO L195 NwaCegarLoop]: trace histogram [7, 7, 7, 5, 5, 5, 5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 10:43:58,936 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Ended with exit code 0 [2022-12-14 10:43:59,133 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 10:43:59,134 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 10:43:59,135 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 10:43:59,135 INFO L85 PathProgramCache]: Analyzing trace with hash 1966394026, now seen corresponding path program 11 times [2022-12-14 10:43:59,136 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 10:43:59,136 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [421504823] [2022-12-14 10:43:59,136 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 10:43:59,137 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 10:43:59,167 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 10:43:59,664 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 2 proven. 98 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2022-12-14 10:43:59,664 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 10:43:59,664 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [421504823] [2022-12-14 10:43:59,664 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [421504823] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 10:43:59,664 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1301453004] [2022-12-14 10:43:59,664 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 10:43:59,665 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 10:43:59,665 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 10:43:59,665 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 10:43:59,666 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-12-14 10:43:59,716 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2022-12-14 10:43:59,716 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 10:43:59,718 INFO L263 TraceCheckSpWp]: Trace formula consists of 178 conjuncts, 81 conjunts are in the unsatisfiable core [2022-12-14 10:43:59,720 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 10:44:00,314 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 0 proven. 86 refuted. 0 times theorem prover too weak. 39 trivial. 0 not checked. [2022-12-14 10:44:00,315 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 10:44:01,362 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 0 proven. 104 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2022-12-14 10:44:01,363 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1301453004] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 10:44:01,363 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [112806654] [2022-12-14 10:44:01,364 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-12-14 10:44:01,364 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 10:44:01,365 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:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) 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) [2022-12-14 10:44:01,365 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 10:44:01,365 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 22, 25] total 61 [2022-12-14 10:44:01,365 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [169131997] [2022-12-14 10:44:01,365 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 10:44:01,366 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 61 states [2022-12-14 10:44:01,366 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 10:44:01,367 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants. [2022-12-14 10:44:01,367 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=226, Invalid=3434, Unknown=0, NotChecked=0, Total=3660 [2022-12-14 10:44:01,367 INFO L87 Difference]: Start difference. First operand 67 states and 92 transitions. Second operand has 61 states, 57 states have (on average 1.5789473684210527) internal successors, (90), 40 states have internal predecessors, (90), 16 states have call successors, (16), 1 states have call predecessors, (16), 14 states have return successors, (21), 21 states have call predecessors, (21), 16 states have call successors, (21) [2022-12-14 10:44:02,599 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 10:44:02,599 INFO L93 Difference]: Finished difference Result 85 states and 116 transitions. [2022-12-14 10:44:02,599 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2022-12-14 10:44:02,599 INFO L78 Accepts]: Start accepts. Automaton has has 61 states, 57 states have (on average 1.5789473684210527) internal successors, (90), 40 states have internal predecessors, (90), 16 states have call successors, (16), 1 states have call predecessors, (16), 14 states have return successors, (21), 21 states have call predecessors, (21), 16 states have call successors, (21) Word has length 54 [2022-12-14 10:44:02,600 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 10:44:02,601 INFO L225 Difference]: With dead ends: 85 [2022-12-14 10:44:02,601 INFO L226 Difference]: Without dead ends: 79 [2022-12-14 10:44:02,601 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 154 GetRequests, 73 SyntacticMatches, 1 SemanticMatches, 80 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1472 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=646, Invalid=5996, Unknown=0, NotChecked=0, Total=6642 [2022-12-14 10:44:02,602 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 173 mSDsluCounter, 303 mSDsCounter, 0 mSdLazyCounter, 1241 mSolverCounterSat, 147 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 177 SdHoareTripleChecker+Valid, 319 SdHoareTripleChecker+Invalid, 1388 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 147 IncrementalHoareTripleChecker+Valid, 1241 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-12-14 10:44:02,602 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [177 Valid, 319 Invalid, 1388 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [147 Valid, 1241 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-12-14 10:44:02,603 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2022-12-14 10:44:02,610 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 65. [2022-12-14 10:44:02,610 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 44 states have (on average 1.0909090909090908) internal successors, (48), 45 states have internal predecessors, (48), 8 states have call successors, (8), 4 states have call predecessors, (8), 12 states have return successors, (31), 15 states have call predecessors, (31), 8 states have call successors, (31) [2022-12-14 10:44:02,611 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 87 transitions. [2022-12-14 10:44:02,611 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 87 transitions. Word has length 54 [2022-12-14 10:44:02,611 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 10:44:02,611 INFO L495 AbstractCegarLoop]: Abstraction has 65 states and 87 transitions. [2022-12-14 10:44:02,611 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 61 states, 57 states have (on average 1.5789473684210527) internal successors, (90), 40 states have internal predecessors, (90), 16 states have call successors, (16), 1 states have call predecessors, (16), 14 states have return successors, (21), 21 states have call predecessors, (21), 16 states have call successors, (21) [2022-12-14 10:44:02,611 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 87 transitions. [2022-12-14 10:44:02,612 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2022-12-14 10:44:02,612 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 10:44:02,612 INFO L195 NwaCegarLoop]: trace histogram [11, 11, 11, 9, 9, 9, 9, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 10:44:02,616 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Ended with exit code 0 [2022-12-14 10:44:02,812 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2022-12-14 10:44:02,813 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 10:44:02,814 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 10:44:02,814 INFO L85 PathProgramCache]: Analyzing trace with hash -1392852054, now seen corresponding path program 12 times [2022-12-14 10:44:02,814 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 10:44:02,814 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [520405646] [2022-12-14 10:44:02,814 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 10:44:02,815 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 10:44:02,858 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 10:44:04,115 INFO L134 CoverageAnalysis]: Checked inductivity of 347 backedges. 0 proven. 288 refuted. 0 times theorem prover too weak. 59 trivial. 0 not checked. [2022-12-14 10:44:04,116 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 10:44:04,116 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [520405646] [2022-12-14 10:44:04,116 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [520405646] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 10:44:04,116 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1166934029] [2022-12-14 10:44:04,116 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 10:44:04,116 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 10:44:04,116 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 10:44:04,117 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 10:44:04,118 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2022-12-14 10:44:04,171 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 10:44:04,172 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 10:44:04,174 WARN L261 TraceCheckSpWp]: Trace formula consists of 254 conjuncts, 133 conjunts are in the unsatisfiable core [2022-12-14 10:44:04,176 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 10:44:05,341 INFO L134 CoverageAnalysis]: Checked inductivity of 347 backedges. 7 proven. 167 refuted. 0 times theorem prover too weak. 173 trivial. 0 not checked. [2022-12-14 10:44:05,341 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 10:44:08,767 INFO L134 CoverageAnalysis]: Checked inductivity of 347 backedges. 32 proven. 256 refuted. 0 times theorem prover too weak. 59 trivial. 0 not checked. [2022-12-14 10:44:08,767 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1166934029] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 10:44:08,767 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1980355408] [2022-12-14 10:44:08,768 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-12-14 10:44:08,768 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 10:44:08,769 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:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) 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) [2022-12-14 10:44:08,769 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 10:44:08,769 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 24, 36] total 85 [2022-12-14 10:44:08,769 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [400653405] [2022-12-14 10:44:08,769 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 10:44:08,770 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 85 states [2022-12-14 10:44:08,770 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 10:44:08,770 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 85 interpolants. [2022-12-14 10:44:08,771 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=291, Invalid=6849, Unknown=0, NotChecked=0, Total=7140 [2022-12-14 10:44:08,771 INFO L87 Difference]: Start difference. First operand 65 states and 87 transitions. Second operand has 85 states, 80 states have (on average 1.525) internal successors, (122), 55 states have internal predecessors, (122), 23 states have call successors, (23), 1 states have call predecessors, (23), 20 states have return successors, (31), 30 states have call predecessors, (31), 23 states have call successors, (31) [2022-12-14 10:44:10,962 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 10:44:10,962 INFO L93 Difference]: Finished difference Result 88 states and 120 transitions. [2022-12-14 10:44:10,962 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2022-12-14 10:44:10,962 INFO L78 Accepts]: Start accepts. Automaton has has 85 states, 80 states have (on average 1.525) internal successors, (122), 55 states have internal predecessors, (122), 23 states have call successors, (23), 1 states have call predecessors, (23), 20 states have return successors, (31), 30 states have call predecessors, (31), 23 states have call successors, (31) Word has length 82 [2022-12-14 10:44:10,962 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 10:44:10,963 INFO L225 Difference]: With dead ends: 88 [2022-12-14 10:44:10,963 INFO L226 Difference]: Without dead ends: 82 [2022-12-14 10:44:10,964 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 230 GetRequests, 110 SyntacticMatches, 10 SemanticMatches, 110 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2791 ImplicationChecksByTransitivity, 4.7s TimeCoverageRelationStatistics Valid=1074, Invalid=11358, Unknown=0, NotChecked=0, Total=12432 [2022-12-14 10:44:10,965 INFO L413 NwaCegarLoop]: 22 mSDtfsCounter, 407 mSDsluCounter, 701 mSDsCounter, 0 mSdLazyCounter, 2225 mSolverCounterSat, 236 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 409 SdHoareTripleChecker+Valid, 723 SdHoareTripleChecker+Invalid, 2461 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 236 IncrementalHoareTripleChecker+Valid, 2225 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2022-12-14 10:44:10,965 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [409 Valid, 723 Invalid, 2461 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [236 Valid, 2225 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2022-12-14 10:44:10,965 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2022-12-14 10:44:10,972 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 68. [2022-12-14 10:44:10,972 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 68 states, 46 states have (on average 1.0869565217391304) internal successors, (50), 47 states have internal predecessors, (50), 8 states have call successors, (8), 4 states have call predecessors, (8), 13 states have return successors, (34), 16 states have call predecessors, (34), 8 states have call successors, (34) [2022-12-14 10:44:10,972 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 92 transitions. [2022-12-14 10:44:10,972 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 92 transitions. Word has length 82 [2022-12-14 10:44:10,973 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 10:44:10,973 INFO L495 AbstractCegarLoop]: Abstraction has 68 states and 92 transitions. [2022-12-14 10:44:10,973 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 85 states, 80 states have (on average 1.525) internal successors, (122), 55 states have internal predecessors, (122), 23 states have call successors, (23), 1 states have call predecessors, (23), 20 states have return successors, (31), 30 states have call predecessors, (31), 23 states have call successors, (31) [2022-12-14 10:44:10,973 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 92 transitions. [2022-12-14 10:44:10,974 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2022-12-14 10:44:10,974 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 10:44:10,974 INFO L195 NwaCegarLoop]: trace histogram [11, 11, 11, 9, 9, 9, 9, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 10:44:10,979 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Ended with exit code 0 [2022-12-14 10:44:11,174 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2022-12-14 10:44:11,175 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 10:44:11,176 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 10:44:11,177 INFO L85 PathProgramCache]: Analyzing trace with hash 674982776, now seen corresponding path program 13 times [2022-12-14 10:44:11,177 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 10:44:11,177 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1818588374] [2022-12-14 10:44:11,178 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 10:44:11,178 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 10:44:11,209 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 10:44:12,355 INFO L134 CoverageAnalysis]: Checked inductivity of 347 backedges. 0 proven. 288 refuted. 0 times theorem prover too weak. 59 trivial. 0 not checked. [2022-12-14 10:44:12,356 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 10:44:12,356 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1818588374] [2022-12-14 10:44:12,356 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1818588374] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 10:44:12,356 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2038368551] [2022-12-14 10:44:12,356 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 10:44:12,356 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 10:44:12,356 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 10:44:12,357 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 10:44:12,357 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2022-12-14 10:44:12,415 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 10:44:12,417 WARN L261 TraceCheckSpWp]: Trace formula consists of 254 conjuncts, 133 conjunts are in the unsatisfiable core [2022-12-14 10:44:12,419 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 10:44:13,411 INFO L134 CoverageAnalysis]: Checked inductivity of 347 backedges. 4 proven. 164 refuted. 0 times theorem prover too weak. 179 trivial. 0 not checked. [2022-12-14 10:44:13,411 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 10:44:16,601 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2038368551] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 10:44:16,601 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [675347445] [2022-12-14 10:44:16,602 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-12-14 10:44:16,602 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 10:44:16,602 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:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) 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) [2022-12-14 10:44:16,603 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-12-14 10:44:16,603 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 20] total 57 [2022-12-14 10:44:16,603 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1169878801] [2022-12-14 10:44:16,603 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-12-14 10:44:16,603 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 57 states [2022-12-14 10:44:16,603 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 10:44:16,604 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2022-12-14 10:44:16,604 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=273, Invalid=5733, Unknown=0, NotChecked=0, Total=6006 [2022-12-14 10:44:16,604 INFO L87 Difference]: Start difference. First operand 68 states and 92 transitions. Second operand has 57 states, 53 states have (on average 1.4339622641509433) internal successors, (76), 39 states have internal predecessors, (76), 13 states have call successors, (13), 1 states have call predecessors, (13), 16 states have return successors, (18), 18 states have call predecessors, (18), 13 states have call successors, (18) [2022-12-14 10:44:17,833 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 10:44:17,833 INFO L93 Difference]: Finished difference Result 78 states and 102 transitions. [2022-12-14 10:44:17,833 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2022-12-14 10:44:17,833 INFO L78 Accepts]: Start accepts. Automaton has has 57 states, 53 states have (on average 1.4339622641509433) internal successors, (76), 39 states have internal predecessors, (76), 13 states have call successors, (13), 1 states have call predecessors, (13), 16 states have return successors, (18), 18 states have call predecessors, (18), 13 states have call successors, (18) Word has length 82 [2022-12-14 10:44:17,833 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 10:44:17,834 INFO L225 Difference]: With dead ends: 78 [2022-12-14 10:44:17,834 INFO L226 Difference]: Without dead ends: 74 [2022-12-14 10:44:17,835 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 188 GetRequests, 91 SyntacticMatches, 6 SemanticMatches, 91 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1597 ImplicationChecksByTransitivity, 4.0s TimeCoverageRelationStatistics Valid=718, Invalid=7838, Unknown=0, NotChecked=0, Total=8556 [2022-12-14 10:44:17,835 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 103 mSDsluCounter, 375 mSDsCounter, 0 mSdLazyCounter, 1172 mSolverCounterSat, 50 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 104 SdHoareTripleChecker+Valid, 391 SdHoareTripleChecker+Invalid, 1222 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 50 IncrementalHoareTripleChecker+Valid, 1172 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-12-14 10:44:17,835 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [104 Valid, 391 Invalid, 1222 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [50 Valid, 1172 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-12-14 10:44:17,835 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2022-12-14 10:44:17,841 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 70. [2022-12-14 10:44:17,842 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 70 states, 47 states have (on average 1.0851063829787233) internal successors, (51), 48 states have internal predecessors, (51), 9 states have call successors, (9), 4 states have call predecessors, (9), 13 states have return successors, (35), 17 states have call predecessors, (35), 9 states have call successors, (35) [2022-12-14 10:44:17,842 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 95 transitions. [2022-12-14 10:44:17,842 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 95 transitions. Word has length 82 [2022-12-14 10:44:17,842 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 10:44:17,842 INFO L495 AbstractCegarLoop]: Abstraction has 70 states and 95 transitions. [2022-12-14 10:44:17,843 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 57 states, 53 states have (on average 1.4339622641509433) internal successors, (76), 39 states have internal predecessors, (76), 13 states have call successors, (13), 1 states have call predecessors, (13), 16 states have return successors, (18), 18 states have call predecessors, (18), 13 states have call successors, (18) [2022-12-14 10:44:17,843 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 95 transitions. [2022-12-14 10:44:17,844 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2022-12-14 10:44:17,844 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 10:44:17,844 INFO L195 NwaCegarLoop]: trace histogram [12, 12, 12, 10, 10, 10, 10, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 10:44:17,848 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Ended with exit code 0 [2022-12-14 10:44:18,044 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15,14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 10:44:18,045 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 10:44:18,046 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 10:44:18,047 INFO L85 PathProgramCache]: Analyzing trace with hash 1149449002, now seen corresponding path program 14 times [2022-12-14 10:44:18,047 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 10:44:18,047 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1230149172] [2022-12-14 10:44:18,048 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 10:44:18,048 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 10:44:18,067 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 10:44:19,289 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 0 proven. 350 refuted. 0 times theorem prover too weak. 70 trivial. 0 not checked. [2022-12-14 10:44:19,289 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 10:44:19,289 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1230149172] [2022-12-14 10:44:19,289 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1230149172] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 10:44:19,289 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1634704358] [2022-12-14 10:44:19,289 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 10:44:19,290 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 10:44:19,290 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 10:44:19,290 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 10:44:19,291 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2022-12-14 10:44:19,367 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 14 check-sat command(s) [2022-12-14 10:44:19,367 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 10:44:19,369 WARN L261 TraceCheckSpWp]: Trace formula consists of 273 conjuncts, 144 conjunts are in the unsatisfiable core [2022-12-14 10:44:19,371 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 10:44:21,108 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 22 proven. 209 refuted. 0 times theorem prover too weak. 189 trivial. 0 not checked. [2022-12-14 10:44:21,108 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 10:44:26,358 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 36 proven. 318 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2022-12-14 10:44:26,358 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1634704358] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 10:44:26,358 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [880515695] [2022-12-14 10:44:26,360 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-12-14 10:44:26,360 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 10:44:26,360 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:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) 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) [2022-12-14 10:44:26,360 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 10:44:26,360 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42, 30, 43] total 97 [2022-12-14 10:44:26,360 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1874391929] [2022-12-14 10:44:26,360 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 10:44:26,361 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 97 states [2022-12-14 10:44:26,361 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 10:44:26,362 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 97 interpolants. [2022-12-14 10:44:26,363 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=403, Invalid=8909, Unknown=0, NotChecked=0, Total=9312 [2022-12-14 10:44:26,363 INFO L87 Difference]: Start difference. First operand 70 states and 95 transitions. Second operand has 97 states, 90 states have (on average 1.5333333333333334) internal successors, (138), 64 states have internal predecessors, (138), 26 states have call successors, (26), 1 states have call predecessors, (26), 22 states have return successors, (35), 33 states have call predecessors, (35), 26 states have call successors, (35) [2022-12-14 10:44:29,106 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 10:44:29,106 INFO L93 Difference]: Finished difference Result 93 states and 129 transitions. [2022-12-14 10:44:29,106 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2022-12-14 10:44:29,106 INFO L78 Accepts]: Start accepts. Automaton has has 97 states, 90 states have (on average 1.5333333333333334) internal successors, (138), 64 states have internal predecessors, (138), 26 states have call successors, (26), 1 states have call predecessors, (26), 22 states have return successors, (35), 33 states have call predecessors, (35), 26 states have call successors, (35) Word has length 89 [2022-12-14 10:44:29,107 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 10:44:29,108 INFO L225 Difference]: With dead ends: 93 [2022-12-14 10:44:29,108 INFO L226 Difference]: Without dead ends: 87 [2022-12-14 10:44:29,109 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 247 GetRequests, 113 SyntacticMatches, 12 SemanticMatches, 122 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3570 ImplicationChecksByTransitivity, 5.9s TimeCoverageRelationStatistics Valid=1303, Invalid=13949, Unknown=0, NotChecked=0, Total=15252 [2022-12-14 10:44:29,109 INFO L413 NwaCegarLoop]: 23 mSDtfsCounter, 249 mSDsluCounter, 909 mSDsCounter, 0 mSdLazyCounter, 2995 mSolverCounterSat, 134 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 261 SdHoareTripleChecker+Valid, 932 SdHoareTripleChecker+Invalid, 3129 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 134 IncrementalHoareTripleChecker+Valid, 2995 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.6s IncrementalHoareTripleChecker+Time [2022-12-14 10:44:29,109 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [261 Valid, 932 Invalid, 3129 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [134 Valid, 2995 Invalid, 0 Unknown, 0 Unchecked, 1.6s Time] [2022-12-14 10:44:29,110 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2022-12-14 10:44:29,122 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 73. [2022-12-14 10:44:29,122 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 73 states, 49 states have (on average 1.0816326530612246) internal successors, (53), 50 states have internal predecessors, (53), 9 states have call successors, (9), 4 states have call predecessors, (9), 14 states have return successors, (38), 18 states have call predecessors, (38), 9 states have call successors, (38) [2022-12-14 10:44:29,123 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 100 transitions. [2022-12-14 10:44:29,123 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 100 transitions. Word has length 89 [2022-12-14 10:44:29,123 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 10:44:29,123 INFO L495 AbstractCegarLoop]: Abstraction has 73 states and 100 transitions. [2022-12-14 10:44:29,124 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 97 states, 90 states have (on average 1.5333333333333334) internal successors, (138), 64 states have internal predecessors, (138), 26 states have call successors, (26), 1 states have call predecessors, (26), 22 states have return successors, (35), 33 states have call predecessors, (35), 26 states have call successors, (35) [2022-12-14 10:44:29,124 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 100 transitions. [2022-12-14 10:44:29,125 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2022-12-14 10:44:29,125 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 10:44:29,125 INFO L195 NwaCegarLoop]: trace histogram [12, 12, 12, 10, 10, 10, 10, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 10:44:29,130 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Ended with exit code 0 [2022-12-14 10:44:29,326 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2022-12-14 10:44:29,326 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 10:44:29,327 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 10:44:29,327 INFO L85 PathProgramCache]: Analyzing trace with hash -1325207446, now seen corresponding path program 15 times [2022-12-14 10:44:29,328 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 10:44:29,328 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1858220190] [2022-12-14 10:44:29,329 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 10:44:29,329 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 10:44:29,373 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 10:44:30,673 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 0 proven. 347 refuted. 0 times theorem prover too weak. 73 trivial. 0 not checked. [2022-12-14 10:44:30,674 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 10:44:30,674 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1858220190] [2022-12-14 10:44:30,674 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1858220190] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 10:44:30,674 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1023982035] [2022-12-14 10:44:30,674 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 10:44:30,674 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 10:44:30,674 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 10:44:30,675 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 10:44:30,676 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2022-12-14 10:44:30,764 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 10:44:30,764 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 10:44:30,768 WARN L261 TraceCheckSpWp]: Trace formula consists of 273 conjuncts, 145 conjunts are in the unsatisfiable core [2022-12-14 10:44:30,770 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 10:44:32,023 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 4 proven. 199 refuted. 0 times theorem prover too weak. 217 trivial. 0 not checked. [2022-12-14 10:44:32,023 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 10:44:38,412 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1023982035] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 10:44:38,412 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2045092028] [2022-12-14 10:44:38,413 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-12-14 10:44:38,413 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 10:44:38,414 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:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) 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) [2022-12-14 10:44:38,414 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-12-14 10:44:38,414 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 22] total 61 [2022-12-14 10:44:38,414 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [392614624] [2022-12-14 10:44:38,414 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-12-14 10:44:38,415 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 61 states [2022-12-14 10:44:38,415 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 10:44:38,415 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants. [2022-12-14 10:44:38,416 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=285, Invalid=6354, Unknown=3, NotChecked=0, Total=6642 [2022-12-14 10:44:38,416 INFO L87 Difference]: Start difference. First operand 73 states and 100 transitions. Second operand has 61 states, 57 states have (on average 1.4035087719298245) internal successors, (80), 41 states have internal predecessors, (80), 13 states have call successors, (13), 1 states have call predecessors, (13), 18 states have return successors, (20), 20 states have call predecessors, (20), 13 states have call successors, (20) [2022-12-14 10:44:39,854 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 10:44:39,854 INFO L93 Difference]: Finished difference Result 83 states and 110 transitions. [2022-12-14 10:44:39,855 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2022-12-14 10:44:39,855 INFO L78 Accepts]: Start accepts. Automaton has has 61 states, 57 states have (on average 1.4035087719298245) internal successors, (80), 41 states have internal predecessors, (80), 13 states have call successors, (13), 1 states have call predecessors, (13), 18 states have return successors, (20), 20 states have call predecessors, (20), 13 states have call successors, (20) Word has length 89 [2022-12-14 10:44:39,855 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 10:44:39,856 INFO L225 Difference]: With dead ends: 83 [2022-12-14 10:44:39,856 INFO L226 Difference]: Without dead ends: 79 [2022-12-14 10:44:39,857 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 200 GetRequests, 97 SyntacticMatches, 6 SemanticMatches, 97 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1800 ImplicationChecksByTransitivity, 7.5s TimeCoverageRelationStatistics Valid=796, Invalid=8903, Unknown=3, NotChecked=0, Total=9702 [2022-12-14 10:44:39,857 INFO L413 NwaCegarLoop]: 20 mSDtfsCounter, 118 mSDsluCounter, 564 mSDsCounter, 0 mSdLazyCounter, 1382 mSolverCounterSat, 56 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 119 SdHoareTripleChecker+Valid, 584 SdHoareTripleChecker+Invalid, 1438 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 56 IncrementalHoareTripleChecker+Valid, 1382 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-12-14 10:44:39,858 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [119 Valid, 584 Invalid, 1438 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [56 Valid, 1382 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-12-14 10:44:39,858 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2022-12-14 10:44:39,869 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 73. [2022-12-14 10:44:39,870 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 73 states, 49 states have (on average 1.0816326530612246) internal successors, (53), 50 states have internal predecessors, (53), 9 states have call successors, (9), 4 states have call predecessors, (9), 14 states have return successors, (38), 18 states have call predecessors, (38), 9 states have call successors, (38) [2022-12-14 10:44:39,871 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 100 transitions. [2022-12-14 10:44:39,871 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 100 transitions. Word has length 89 [2022-12-14 10:44:39,871 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 10:44:39,871 INFO L495 AbstractCegarLoop]: Abstraction has 73 states and 100 transitions. [2022-12-14 10:44:39,871 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 61 states, 57 states have (on average 1.4035087719298245) internal successors, (80), 41 states have internal predecessors, (80), 13 states have call successors, (13), 1 states have call predecessors, (13), 18 states have return successors, (20), 20 states have call predecessors, (20), 13 states have call successors, (20) [2022-12-14 10:44:39,872 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 100 transitions. [2022-12-14 10:44:39,873 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2022-12-14 10:44:39,873 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 10:44:39,873 INFO L195 NwaCegarLoop]: trace histogram [13, 13, 13, 11, 11, 11, 11, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 10:44:39,877 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Ended with exit code 0 [2022-12-14 10:44:40,073 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2022-12-14 10:44:40,074 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 10:44:40,074 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 10:44:40,074 INFO L85 PathProgramCache]: Analyzing trace with hash -2050033702, now seen corresponding path program 16 times [2022-12-14 10:44:40,074 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 10:44:40,074 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2121352499] [2022-12-14 10:44:40,074 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 10:44:40,074 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 10:44:40,084 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 10:44:41,519 INFO L134 CoverageAnalysis]: Checked inductivity of 500 backedges. 0 proven. 418 refuted. 0 times theorem prover too weak. 82 trivial. 0 not checked. [2022-12-14 10:44:41,520 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 10:44:41,520 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2121352499] [2022-12-14 10:44:41,520 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2121352499] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 10:44:41,520 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2010226955] [2022-12-14 10:44:41,520 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 10:44:41,520 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 10:44:41,520 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 10:44:41,521 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 10:44:41,521 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2022-12-14 10:44:41,606 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 10:44:41,610 WARN L261 TraceCheckSpWp]: Trace formula consists of 292 conjuncts, 157 conjunts are in the unsatisfiable core [2022-12-14 10:44:41,613 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 10:44:43,102 INFO L134 CoverageAnalysis]: Checked inductivity of 500 backedges. 9 proven. 238 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2022-12-14 10:44:43,102 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 10:44:47,823 INFO L134 CoverageAnalysis]: Checked inductivity of 500 backedges. 38 proven. 380 refuted. 0 times theorem prover too weak. 82 trivial. 0 not checked. [2022-12-14 10:44:47,823 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2010226955] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 10:44:47,823 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1974022218] [2022-12-14 10:44:47,824 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-12-14 10:44:47,824 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 10:44:47,825 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:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) 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) [2022-12-14 10:44:47,825 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 10:44:47,825 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 28, 42] total 99 [2022-12-14 10:44:47,825 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1750689937] [2022-12-14 10:44:47,825 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 10:44:47,826 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 99 states [2022-12-14 10:44:47,826 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 10:44:47,827 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 99 interpolants. [2022-12-14 10:44:47,827 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=339, Invalid=9363, Unknown=0, NotChecked=0, Total=9702 [2022-12-14 10:44:47,828 INFO L87 Difference]: Start difference. First operand 73 states and 100 transitions. Second operand has 99 states, 94 states have (on average 1.5319148936170213) internal successors, (144), 63 states have internal predecessors, (144), 27 states have call successors, (27), 1 states have call predecessors, (27), 24 states have return successors, (37), 36 states have call predecessors, (37), 27 states have call successors, (37) [2022-12-14 10:44:50,753 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 10:44:50,753 INFO L93 Difference]: Finished difference Result 96 states and 134 transitions. [2022-12-14 10:44:50,753 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2022-12-14 10:44:50,753 INFO L78 Accepts]: Start accepts. Automaton has has 99 states, 94 states have (on average 1.5319148936170213) internal successors, (144), 63 states have internal predecessors, (144), 27 states have call successors, (27), 1 states have call predecessors, (27), 24 states have return successors, (37), 36 states have call predecessors, (37), 27 states have call successors, (37) Word has length 96 [2022-12-14 10:44:50,753 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 10:44:50,754 INFO L225 Difference]: With dead ends: 96 [2022-12-14 10:44:50,754 INFO L226 Difference]: Without dead ends: 90 [2022-12-14 10:44:50,755 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 268 GetRequests, 128 SyntacticMatches, 12 SemanticMatches, 128 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3809 ImplicationChecksByTransitivity, 5.9s TimeCoverageRelationStatistics Valid=1372, Invalid=15398, Unknown=0, NotChecked=0, Total=16770 [2022-12-14 10:44:50,755 INFO L413 NwaCegarLoop]: 24 mSDtfsCounter, 521 mSDsluCounter, 910 mSDsCounter, 0 mSdLazyCounter, 2975 mSolverCounterSat, 293 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 523 SdHoareTripleChecker+Valid, 934 SdHoareTripleChecker+Invalid, 3268 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 293 IncrementalHoareTripleChecker+Valid, 2975 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.5s IncrementalHoareTripleChecker+Time [2022-12-14 10:44:50,755 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [523 Valid, 934 Invalid, 3268 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [293 Valid, 2975 Invalid, 0 Unknown, 0 Unchecked, 1.5s Time] [2022-12-14 10:44:50,756 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2022-12-14 10:44:50,763 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 76. [2022-12-14 10:44:50,763 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 76 states, 51 states have (on average 1.0784313725490196) internal successors, (55), 52 states have internal predecessors, (55), 9 states have call successors, (9), 4 states have call predecessors, (9), 15 states have return successors, (41), 19 states have call predecessors, (41), 9 states have call successors, (41) [2022-12-14 10:44:50,764 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 105 transitions. [2022-12-14 10:44:50,764 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 105 transitions. Word has length 96 [2022-12-14 10:44:50,764 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 10:44:50,764 INFO L495 AbstractCegarLoop]: Abstraction has 76 states and 105 transitions. [2022-12-14 10:44:50,764 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 99 states, 94 states have (on average 1.5319148936170213) internal successors, (144), 63 states have internal predecessors, (144), 27 states have call successors, (27), 1 states have call predecessors, (27), 24 states have return successors, (37), 36 states have call predecessors, (37), 27 states have call successors, (37) [2022-12-14 10:44:50,764 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 105 transitions. [2022-12-14 10:44:50,765 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2022-12-14 10:44:50,765 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 10:44:50,765 INFO L195 NwaCegarLoop]: trace histogram [13, 13, 13, 11, 11, 11, 11, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 10:44:50,769 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2022-12-14 10:44:50,965 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 10:44:50,967 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 10:44:50,967 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 10:44:50,967 INFO L85 PathProgramCache]: Analyzing trace with hash -1662689016, now seen corresponding path program 17 times [2022-12-14 10:44:50,968 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 10:44:50,968 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [8816314] [2022-12-14 10:44:50,968 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 10:44:50,969 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 10:44:51,016 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 10:44:52,332 INFO L134 CoverageAnalysis]: Checked inductivity of 500 backedges. 0 proven. 418 refuted. 0 times theorem prover too weak. 82 trivial. 0 not checked. [2022-12-14 10:44:52,332 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 10:44:52,332 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [8816314] [2022-12-14 10:44:52,332 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [8816314] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 10:44:52,332 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [426275852] [2022-12-14 10:44:52,332 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 10:44:52,332 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 10:44:52,332 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 10:44:52,333 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 10:44:52,334 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2022-12-14 10:44:52,416 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 14 check-sat command(s) [2022-12-14 10:44:52,416 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 10:44:52,419 WARN L261 TraceCheckSpWp]: Trace formula consists of 292 conjuncts, 157 conjunts are in the unsatisfiable core [2022-12-14 10:44:52,421 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 10:44:53,511 INFO L134 CoverageAnalysis]: Checked inductivity of 500 backedges. 9 proven. 233 refuted. 0 times theorem prover too weak. 258 trivial. 0 not checked. [2022-12-14 10:44:53,511 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 10:44:56,757 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [426275852] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 10:44:56,757 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [600472487] [2022-12-14 10:44:56,757 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-12-14 10:44:56,757 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 10:44:56,758 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:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) 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) [2022-12-14 10:44:56,758 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-12-14 10:44:56,758 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 24] total 67 [2022-12-14 10:44:56,758 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [521804667] [2022-12-14 10:44:56,758 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-12-14 10:44:56,758 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 67 states [2022-12-14 10:44:56,758 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 10:44:56,759 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 67 interpolants. [2022-12-14 10:44:56,759 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=303, Invalid=7353, Unknown=0, NotChecked=0, Total=7656 [2022-12-14 10:44:56,759 INFO L87 Difference]: Start difference. First operand 76 states and 105 transitions. Second operand has 67 states, 63 states have (on average 1.4603174603174602) internal successors, (92), 45 states have internal predecessors, (92), 15 states have call successors, (15), 1 states have call predecessors, (15), 20 states have return successors, (22), 22 states have call predecessors, (22), 15 states have call successors, (22) [2022-12-14 10:44:57,911 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 10:44:57,911 INFO L93 Difference]: Finished difference Result 86 states and 115 transitions. [2022-12-14 10:44:57,912 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2022-12-14 10:44:57,912 INFO L78 Accepts]: Start accepts. Automaton has has 67 states, 63 states have (on average 1.4603174603174602) internal successors, (92), 45 states have internal predecessors, (92), 15 states have call successors, (15), 1 states have call predecessors, (15), 20 states have return successors, (22), 22 states have call predecessors, (22), 15 states have call successors, (22) Word has length 96 [2022-12-14 10:44:57,912 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 10:44:57,913 INFO L225 Difference]: With dead ends: 86 [2022-12-14 10:44:57,913 INFO L226 Difference]: Without dead ends: 82 [2022-12-14 10:44:57,914 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 212 GetRequests, 99 SyntacticMatches, 8 SemanticMatches, 105 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2087 ImplicationChecksByTransitivity, 4.3s TimeCoverageRelationStatistics Valid=914, Invalid=10428, Unknown=0, NotChecked=0, Total=11342 [2022-12-14 10:44:57,915 INFO L413 NwaCegarLoop]: 19 mSDtfsCounter, 165 mSDsluCounter, 511 mSDsCounter, 0 mSdLazyCounter, 1400 mSolverCounterSat, 81 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 167 SdHoareTripleChecker+Valid, 530 SdHoareTripleChecker+Invalid, 1481 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 81 IncrementalHoareTripleChecker+Valid, 1400 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-12-14 10:44:57,915 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [167 Valid, 530 Invalid, 1481 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [81 Valid, 1400 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-12-14 10:44:57,915 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2022-12-14 10:44:57,922 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 76. [2022-12-14 10:44:57,922 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 76 states, 51 states have (on average 1.0784313725490196) internal successors, (55), 52 states have internal predecessors, (55), 9 states have call successors, (9), 4 states have call predecessors, (9), 15 states have return successors, (41), 19 states have call predecessors, (41), 9 states have call successors, (41) [2022-12-14 10:44:57,923 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 105 transitions. [2022-12-14 10:44:57,923 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 105 transitions. Word has length 96 [2022-12-14 10:44:57,923 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 10:44:57,923 INFO L495 AbstractCegarLoop]: Abstraction has 76 states and 105 transitions. [2022-12-14 10:44:57,923 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 67 states, 63 states have (on average 1.4603174603174602) internal successors, (92), 45 states have internal predecessors, (92), 15 states have call successors, (15), 1 states have call predecessors, (15), 20 states have return successors, (22), 22 states have call predecessors, (22), 15 states have call successors, (22) [2022-12-14 10:44:57,923 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 105 transitions. [2022-12-14 10:44:57,924 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2022-12-14 10:44:57,924 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 10:44:57,924 INFO L195 NwaCegarLoop]: trace histogram [17, 17, 17, 15, 15, 15, 15, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 10:44:57,929 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Ended with exit code 0 [2022-12-14 10:44:58,125 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 10:44:58,126 INFO L420 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 10:44:58,126 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 10:44:58,127 INFO L85 PathProgramCache]: Analyzing trace with hash 1826787688, now seen corresponding path program 18 times [2022-12-14 10:44:58,127 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 10:44:58,127 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [611817723] [2022-12-14 10:44:58,128 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 10:44:58,128 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 10:44:58,179 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 10:45:00,217 INFO L134 CoverageAnalysis]: Checked inductivity of 890 backedges. 1 proven. 746 refuted. 0 times theorem prover too weak. 143 trivial. 0 not checked. [2022-12-14 10:45:00,217 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 10:45:00,217 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [611817723] [2022-12-14 10:45:00,217 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [611817723] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 10:45:00,217 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1132610065] [2022-12-14 10:45:00,217 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 10:45:00,217 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 10:45:00,218 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 10:45:00,218 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 10:45:00,219 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2022-12-14 10:45:00,305 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 10:45:00,305 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 10:45:00,308 WARN L261 TraceCheckSpWp]: Trace formula consists of 368 conjuncts, 205 conjunts are in the unsatisfiable core [2022-12-14 10:45:00,310 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 10:45:02,307 INFO L134 CoverageAnalysis]: Checked inductivity of 890 backedges. 10 proven. 410 refuted. 0 times theorem prover too weak. 470 trivial. 0 not checked. [2022-12-14 10:45:02,307 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 10:45:11,889 INFO L134 CoverageAnalysis]: Checked inductivity of 890 backedges. 59 proven. 691 refuted. 0 times theorem prover too weak. 140 trivial. 0 not checked. [2022-12-14 10:45:11,890 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1132610065] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 10:45:11,890 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [626709546] [2022-12-14 10:45:11,891 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-12-14 10:45:11,891 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 10:45:11,891 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:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) 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) [2022-12-14 10:45:11,892 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 10:45:11,892 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [56, 30, 55] total 124 [2022-12-14 10:45:11,892 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [99422318] [2022-12-14 10:45:11,892 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 10:45:11,893 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 124 states [2022-12-14 10:45:11,893 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 10:45:11,894 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 124 interpolants. [2022-12-14 10:45:11,895 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=445, Invalid=14806, Unknown=1, NotChecked=0, Total=15252 [2022-12-14 10:45:11,895 INFO L87 Difference]: Start difference. First operand 76 states and 105 transitions. Second operand has 124 states, 118 states have (on average 1.5423728813559323) internal successors, (182), 79 states have internal predecessors, (182), 34 states have call successors, (34), 1 states have call predecessors, (34), 32 states have return successors, (46), 45 states have call predecessors, (46), 34 states have call successors, (46) [2022-12-14 10:45:15,653 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 10:45:15,653 INFO L93 Difference]: Finished difference Result 99 states and 148 transitions. [2022-12-14 10:45:15,653 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2022-12-14 10:45:15,653 INFO L78 Accepts]: Start accepts. Automaton has has 124 states, 118 states have (on average 1.5423728813559323) internal successors, (182), 79 states have internal predecessors, (182), 34 states have call successors, (34), 1 states have call predecessors, (34), 32 states have return successors, (46), 45 states have call predecessors, (46), 34 states have call successors, (46) Word has length 124 [2022-12-14 10:45:15,653 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 10:45:15,654 INFO L225 Difference]: With dead ends: 99 [2022-12-14 10:45:15,655 INFO L226 Difference]: Without dead ends: 93 [2022-12-14 10:45:15,656 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 338 GetRequests, 170 SyntacticMatches, 13 SemanticMatches, 155 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 5436 ImplicationChecksByTransitivity, 9.5s TimeCoverageRelationStatistics Valid=1763, Invalid=22728, Unknown=1, NotChecked=0, Total=24492 [2022-12-14 10:45:15,657 INFO L413 NwaCegarLoop]: 25 mSDtfsCounter, 399 mSDsluCounter, 1254 mSDsCounter, 0 mSdLazyCounter, 4665 mSolverCounterSat, 243 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 401 SdHoareTripleChecker+Valid, 1279 SdHoareTripleChecker+Invalid, 4908 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 243 IncrementalHoareTripleChecker+Valid, 4665 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.0s IncrementalHoareTripleChecker+Time [2022-12-14 10:45:15,657 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [401 Valid, 1279 Invalid, 4908 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [243 Valid, 4665 Invalid, 0 Unknown, 0 Unchecked, 2.0s Time] [2022-12-14 10:45:15,658 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2022-12-14 10:45:15,670 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 79. [2022-12-14 10:45:15,670 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 79 states, 53 states have (on average 1.0754716981132075) internal successors, (57), 54 states have internal predecessors, (57), 9 states have call successors, (9), 4 states have call predecessors, (9), 16 states have return successors, (44), 20 states have call predecessors, (44), 9 states have call successors, (44) [2022-12-14 10:45:15,671 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 110 transitions. [2022-12-14 10:45:15,671 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 110 transitions. Word has length 124 [2022-12-14 10:45:15,671 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 10:45:15,671 INFO L495 AbstractCegarLoop]: Abstraction has 79 states and 110 transitions. [2022-12-14 10:45:15,672 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 124 states, 118 states have (on average 1.5423728813559323) internal successors, (182), 79 states have internal predecessors, (182), 34 states have call successors, (34), 1 states have call predecessors, (34), 32 states have return successors, (46), 45 states have call predecessors, (46), 34 states have call successors, (46) [2022-12-14 10:45:15,672 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 110 transitions. [2022-12-14 10:45:15,673 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2022-12-14 10:45:15,673 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 10:45:15,673 INFO L195 NwaCegarLoop]: trace histogram [14, 14, 14, 12, 12, 12, 12, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 10:45:15,677 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Ended with exit code 0 [2022-12-14 10:45:15,873 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable20 [2022-12-14 10:45:15,874 INFO L420 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 10:45:15,875 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 10:45:15,875 INFO L85 PathProgramCache]: Analyzing trace with hash -1962244390, now seen corresponding path program 19 times [2022-12-14 10:45:15,876 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 10:45:15,876 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2108162635] [2022-12-14 10:45:15,876 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 10:45:15,877 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 10:45:15,910 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 10:45:17,267 INFO L134 CoverageAnalysis]: Checked inductivity of 587 backedges. 1 proven. 488 refuted. 0 times theorem prover too weak. 98 trivial. 0 not checked. [2022-12-14 10:45:17,267 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 10:45:17,267 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2108162635] [2022-12-14 10:45:17,267 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2108162635] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 10:45:17,267 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1214666597] [2022-12-14 10:45:17,267 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 10:45:17,268 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 10:45:17,268 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 10:45:17,268 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 10:45:17,269 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2022-12-14 10:45:17,370 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 10:45:17,373 WARN L261 TraceCheckSpWp]: Trace formula consists of 311 conjuncts, 169 conjunts are in the unsatisfiable core [2022-12-14 10:45:17,375 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 10:45:18,998 INFO L134 CoverageAnalysis]: Checked inductivity of 587 backedges. 4 proven. 278 refuted. 0 times theorem prover too weak. 305 trivial. 0 not checked. [2022-12-14 10:45:18,998 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 10:45:23,221 INFO L134 CoverageAnalysis]: Checked inductivity of 587 backedges. 14 proven. 454 refuted. 0 times theorem prover too weak. 119 trivial. 0 not checked. [2022-12-14 10:45:23,221 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1214666597] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 10:45:23,221 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1004650403] [2022-12-14 10:45:23,222 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-12-14 10:45:23,222 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 10:45:23,222 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:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) 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) [2022-12-14 10:45:23,222 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 10:45:23,222 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 26, 33] total 92 [2022-12-14 10:45:23,222 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1502194790] [2022-12-14 10:45:23,222 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 10:45:23,223 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 92 states [2022-12-14 10:45:23,223 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 10:45:23,223 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 92 interpolants. [2022-12-14 10:45:23,223 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=322, Invalid=8050, Unknown=0, NotChecked=0, Total=8372 [2022-12-14 10:45:23,224 INFO L87 Difference]: Start difference. First operand 79 states and 110 transitions. Second operand has 92 states, 87 states have (on average 1.5057471264367817) internal successors, (131), 59 states have internal predecessors, (131), 24 states have call successors, (24), 1 states have call predecessors, (24), 23 states have return successors, (34), 33 states have call predecessors, (34), 24 states have call successors, (34) [2022-12-14 10:45:25,566 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 10:45:25,567 INFO L93 Difference]: Finished difference Result 95 states and 139 transitions. [2022-12-14 10:45:25,567 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2022-12-14 10:45:25,567 INFO L78 Accepts]: Start accepts. Automaton has has 92 states, 87 states have (on average 1.5057471264367817) internal successors, (131), 59 states have internal predecessors, (131), 24 states have call successors, (24), 1 states have call predecessors, (24), 23 states have return successors, (34), 33 states have call predecessors, (34), 24 states have call successors, (34) Word has length 103 [2022-12-14 10:45:25,568 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 10:45:25,569 INFO L225 Difference]: With dead ends: 95 [2022-12-14 10:45:25,569 INFO L226 Difference]: Without dead ends: 89 [2022-12-14 10:45:25,570 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 282 GetRequests, 151 SyntacticMatches, 13 SemanticMatches, 118 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3136 ImplicationChecksByTransitivity, 5.3s TimeCoverageRelationStatistics Valid=1200, Invalid=13080, Unknown=0, NotChecked=0, Total=14280 [2022-12-14 10:45:25,570 INFO L413 NwaCegarLoop]: 19 mSDtfsCounter, 431 mSDsluCounter, 473 mSDsCounter, 0 mSdLazyCounter, 2101 mSolverCounterSat, 357 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 434 SdHoareTripleChecker+Valid, 492 SdHoareTripleChecker+Invalid, 2458 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 357 IncrementalHoareTripleChecker+Valid, 2101 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2022-12-14 10:45:25,570 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [434 Valid, 492 Invalid, 2458 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [357 Valid, 2101 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2022-12-14 10:45:25,570 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2022-12-14 10:45:25,579 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 77. [2022-12-14 10:45:25,579 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 77 states, 52 states have (on average 1.0769230769230769) internal successors, (56), 53 states have internal predecessors, (56), 8 states have call successors, (8), 4 states have call predecessors, (8), 16 states have return successors, (42), 19 states have call predecessors, (42), 8 states have call successors, (42) [2022-12-14 10:45:25,579 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 106 transitions. [2022-12-14 10:45:25,579 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 106 transitions. Word has length 103 [2022-12-14 10:45:25,579 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 10:45:25,579 INFO L495 AbstractCegarLoop]: Abstraction has 77 states and 106 transitions. [2022-12-14 10:45:25,580 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 92 states, 87 states have (on average 1.5057471264367817) internal successors, (131), 59 states have internal predecessors, (131), 24 states have call successors, (24), 1 states have call predecessors, (24), 23 states have return successors, (34), 33 states have call predecessors, (34), 24 states have call successors, (34) [2022-12-14 10:45:25,580 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 106 transitions. [2022-12-14 10:45:25,580 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 111 [2022-12-14 10:45:25,580 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 10:45:25,580 INFO L195 NwaCegarLoop]: trace histogram [15, 15, 15, 13, 13, 13, 13, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 10:45:25,585 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Ended with exit code 0 [2022-12-14 10:45:25,781 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2022-12-14 10:45:25,782 INFO L420 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 10:45:25,783 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 10:45:25,783 INFO L85 PathProgramCache]: Analyzing trace with hash 209449994, now seen corresponding path program 20 times [2022-12-14 10:45:25,783 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 10:45:25,783 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [872894708] [2022-12-14 10:45:25,784 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 10:45:25,784 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 10:45:25,823 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 10:45:27,401 INFO L134 CoverageAnalysis]: Checked inductivity of 681 backedges. 0 proven. 572 refuted. 0 times theorem prover too weak. 109 trivial. 0 not checked. [2022-12-14 10:45:27,402 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 10:45:27,402 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [872894708] [2022-12-14 10:45:27,402 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [872894708] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 10:45:27,402 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [176302203] [2022-12-14 10:45:27,402 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 10:45:27,402 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 10:45:27,402 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 10:45:27,403 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 10:45:27,404 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2022-12-14 10:45:27,525 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 15 check-sat command(s) [2022-12-14 10:45:27,525 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 10:45:27,530 WARN L261 TraceCheckSpWp]: Trace formula consists of 330 conjuncts, 181 conjunts are in the unsatisfiable core [2022-12-14 10:45:27,532 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 10:45:29,166 INFO L134 CoverageAnalysis]: Checked inductivity of 681 backedges. 11 proven. 321 refuted. 0 times theorem prover too weak. 349 trivial. 0 not checked. [2022-12-14 10:45:29,166 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 10:45:34,996 INFO L134 CoverageAnalysis]: Checked inductivity of 681 backedges. 44 proven. 528 refuted. 0 times theorem prover too weak. 109 trivial. 0 not checked. [2022-12-14 10:45:34,996 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [176302203] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 10:45:34,996 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [229077377] [2022-12-14 10:45:34,997 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-12-14 10:45:34,997 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 10:45:34,997 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:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) 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) [2022-12-14 10:45:34,998 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 10:45:34,998 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 32, 48] total 113 [2022-12-14 10:45:34,998 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [938623149] [2022-12-14 10:45:34,998 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 10:45:34,998 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 113 states [2022-12-14 10:45:34,998 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 10:45:34,999 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 113 interpolants. [2022-12-14 10:45:34,999 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=387, Invalid=12269, Unknown=0, NotChecked=0, Total=12656 [2022-12-14 10:45:35,000 INFO L87 Difference]: Start difference. First operand 77 states and 106 transitions. Second operand has 113 states, 108 states have (on average 1.537037037037037) internal successors, (166), 71 states have internal predecessors, (166), 31 states have call successors, (31), 1 states have call predecessors, (31), 28 states have return successors, (43), 42 states have call predecessors, (43), 31 states have call successors, (43) [2022-12-14 10:45:38,313 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 10:45:38,313 INFO L93 Difference]: Finished difference Result 96 states and 136 transitions. [2022-12-14 10:45:38,313 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2022-12-14 10:45:38,313 INFO L78 Accepts]: Start accepts. Automaton has has 113 states, 108 states have (on average 1.537037037037037) internal successors, (166), 71 states have internal predecessors, (166), 31 states have call successors, (31), 1 states have call predecessors, (31), 28 states have return successors, (43), 42 states have call predecessors, (43), 31 states have call successors, (43) Word has length 110 [2022-12-14 10:45:38,314 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 10:45:38,314 INFO L225 Difference]: With dead ends: 96 [2022-12-14 10:45:38,314 INFO L226 Difference]: Without dead ends: 90 [2022-12-14 10:45:38,315 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 305 GetRequests, 146 SyntacticMatches, 14 SemanticMatches, 145 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4907 ImplicationChecksByTransitivity, 7.1s TimeCoverageRelationStatistics Valid=1698, Invalid=19764, Unknown=0, NotChecked=0, Total=21462 [2022-12-14 10:45:38,316 INFO L413 NwaCegarLoop]: 23 mSDtfsCounter, 140 mSDsluCounter, 909 mSDsCounter, 0 mSdLazyCounter, 3334 mSolverCounterSat, 100 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 143 SdHoareTripleChecker+Valid, 932 SdHoareTripleChecker+Invalid, 3434 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 100 IncrementalHoareTripleChecker+Valid, 3334 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.5s IncrementalHoareTripleChecker+Time [2022-12-14 10:45:38,316 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [143 Valid, 932 Invalid, 3434 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [100 Valid, 3334 Invalid, 0 Unknown, 0 Unchecked, 1.5s Time] [2022-12-14 10:45:38,316 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2022-12-14 10:45:38,325 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 80. [2022-12-14 10:45:38,325 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 80 states, 54 states have (on average 1.0740740740740742) internal successors, (58), 55 states have internal predecessors, (58), 8 states have call successors, (8), 4 states have call predecessors, (8), 17 states have return successors, (45), 20 states have call predecessors, (45), 8 states have call successors, (45) [2022-12-14 10:45:38,325 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 111 transitions. [2022-12-14 10:45:38,325 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 111 transitions. Word has length 110 [2022-12-14 10:45:38,326 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 10:45:38,326 INFO L495 AbstractCegarLoop]: Abstraction has 80 states and 111 transitions. [2022-12-14 10:45:38,326 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 113 states, 108 states have (on average 1.537037037037037) internal successors, (166), 71 states have internal predecessors, (166), 31 states have call successors, (31), 1 states have call predecessors, (31), 28 states have return successors, (43), 42 states have call predecessors, (43), 31 states have call successors, (43) [2022-12-14 10:45:38,326 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 111 transitions. [2022-12-14 10:45:38,326 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 146 [2022-12-14 10:45:38,327 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 10:45:38,327 INFO L195 NwaCegarLoop]: trace histogram [20, 20, 20, 18, 18, 18, 18, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 10:45:38,331 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Ended with exit code 0 [2022-12-14 10:45:38,527 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22,21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 10:45:38,528 INFO L420 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 10:45:38,529 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 10:45:38,529 INFO L85 PathProgramCache]: Analyzing trace with hash 72187818, now seen corresponding path program 21 times [2022-12-14 10:45:38,530 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 10:45:38,530 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [768395199] [2022-12-14 10:45:38,531 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 10:45:38,531 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 10:45:38,561 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 10:45:41,694 INFO L134 CoverageAnalysis]: Checked inductivity of 1256 backedges. 1 proven. 1055 refuted. 0 times theorem prover too weak. 200 trivial. 0 not checked. [2022-12-14 10:45:41,694 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 10:45:41,694 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [768395199] [2022-12-14 10:45:41,694 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [768395199] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 10:45:41,694 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1576125364] [2022-12-14 10:45:41,694 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 10:45:41,694 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 10:45:41,695 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 10:45:41,695 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 10:45:41,696 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2022-12-14 10:45:41,820 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 10:45:41,820 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 10:45:41,825 WARN L261 TraceCheckSpWp]: Trace formula consists of 425 conjuncts, 241 conjunts are in the unsatisfiable core [2022-12-14 10:45:41,828 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 10:45:44,418 INFO L134 CoverageAnalysis]: Checked inductivity of 1256 backedges. 12 proven. 573 refuted. 0 times theorem prover too weak. 671 trivial. 0 not checked. [2022-12-14 10:45:44,418 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 10:46:01,171 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1576125364] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 10:46:01,171 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [109544522] [2022-12-14 10:46:01,172 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-12-14 10:46:01,172 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 10:46:01,173 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:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) 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) [2022-12-14 10:46:01,173 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-12-14 10:46:01,173 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [64, 34] total 96 [2022-12-14 10:46:01,173 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [290042575] [2022-12-14 10:46:01,173 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-12-14 10:46:01,174 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 96 states [2022-12-14 10:46:01,174 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 10:46:01,175 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 96 interpolants. [2022-12-14 10:46:01,175 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=499, Invalid=18955, Unknown=6, NotChecked=0, Total=19460 [2022-12-14 10:46:01,176 INFO L87 Difference]: Start difference. First operand 80 states and 111 transitions. Second operand has 96 states, 92 states have (on average 1.4021739130434783) internal successors, (129), 62 states have internal predecessors, (129), 20 states have call successors, (20), 1 states have call predecessors, (20), 32 states have return successors, (34), 34 states have call predecessors, (34), 20 states have call successors, (34) [2022-12-14 10:46:04,676 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 10:46:04,676 INFO L93 Difference]: Finished difference Result 93 states and 131 transitions. [2022-12-14 10:46:04,676 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2022-12-14 10:46:04,677 INFO L78 Accepts]: Start accepts. Automaton has has 96 states, 92 states have (on average 1.4021739130434783) internal successors, (129), 62 states have internal predecessors, (129), 20 states have call successors, (20), 1 states have call predecessors, (20), 32 states have return successors, (34), 34 states have call predecessors, (34), 20 states have call successors, (34) Word has length 145 [2022-12-14 10:46:04,677 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 10:46:04,678 INFO L225 Difference]: With dead ends: 93 [2022-12-14 10:46:04,678 INFO L226 Difference]: Without dead ends: 89 [2022-12-14 10:46:04,679 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 356 GetRequests, 175 SyntacticMatches, 14 SemanticMatches, 167 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6089 ImplicationChecksByTransitivity, 17.3s TimeCoverageRelationStatistics Valid=1882, Invalid=26504, Unknown=6, NotChecked=0, Total=28392 [2022-12-14 10:46:04,680 INFO L413 NwaCegarLoop]: 23 mSDtfsCounter, 480 mSDsluCounter, 1034 mSDsCounter, 0 mSdLazyCounter, 3294 mSolverCounterSat, 238 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 481 SdHoareTripleChecker+Valid, 1057 SdHoareTripleChecker+Invalid, 3532 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 238 IncrementalHoareTripleChecker+Valid, 3294 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.6s IncrementalHoareTripleChecker+Time [2022-12-14 10:46:04,680 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [481 Valid, 1057 Invalid, 3532 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [238 Valid, 3294 Invalid, 0 Unknown, 0 Unchecked, 1.6s Time] [2022-12-14 10:46:04,680 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2022-12-14 10:46:04,691 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 85. [2022-12-14 10:46:04,691 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 85 states, 57 states have (on average 1.0701754385964912) internal successors, (61), 58 states have internal predecessors, (61), 9 states have call successors, (9), 4 states have call predecessors, (9), 18 states have return successors, (54), 22 states have call predecessors, (54), 9 states have call successors, (54) [2022-12-14 10:46:04,691 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 124 transitions. [2022-12-14 10:46:04,691 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 124 transitions. Word has length 145 [2022-12-14 10:46:04,692 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 10:46:04,692 INFO L495 AbstractCegarLoop]: Abstraction has 85 states and 124 transitions. [2022-12-14 10:46:04,692 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 96 states, 92 states have (on average 1.4021739130434783) internal successors, (129), 62 states have internal predecessors, (129), 20 states have call successors, (20), 1 states have call predecessors, (20), 32 states have return successors, (34), 34 states have call predecessors, (34), 20 states have call successors, (34) [2022-12-14 10:46:04,692 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 124 transitions. [2022-12-14 10:46:04,692 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2022-12-14 10:46:04,693 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 10:46:04,693 INFO L195 NwaCegarLoop]: trace histogram [16, 16, 16, 14, 14, 14, 14, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 10:46:04,698 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Ended with exit code 0 [2022-12-14 10:46:04,893 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23,22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 10:46:04,894 INFO L420 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 10:46:04,894 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 10:46:04,895 INFO L85 PathProgramCache]: Analyzing trace with hash 1925053130, now seen corresponding path program 22 times [2022-12-14 10:46:04,895 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 10:46:04,896 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1601434830] [2022-12-14 10:46:04,896 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 10:46:04,896 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 10:46:04,938 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 10:46:06,929 INFO L134 CoverageAnalysis]: Checked inductivity of 782 backedges. 0 proven. 658 refuted. 0 times theorem prover too weak. 124 trivial. 0 not checked. [2022-12-14 10:46:06,929 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 10:46:06,929 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1601434830] [2022-12-14 10:46:06,929 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1601434830] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 10:46:06,929 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [905508026] [2022-12-14 10:46:06,929 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 10:46:06,929 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 10:46:06,930 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 10:46:06,930 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 10:46:06,931 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2022-12-14 10:46:07,081 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 10:46:07,085 WARN L261 TraceCheckSpWp]: Trace formula consists of 349 conjuncts, 193 conjunts are in the unsatisfiable core [2022-12-14 10:46:07,087 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 10:46:09,034 INFO L134 CoverageAnalysis]: Checked inductivity of 782 backedges. 12 proven. 367 refuted. 0 times theorem prover too weak. 403 trivial. 0 not checked. [2022-12-14 10:46:09,034 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 10:46:16,091 INFO L134 CoverageAnalysis]: Checked inductivity of 782 backedges. 47 proven. 611 refuted. 0 times theorem prover too weak. 124 trivial. 0 not checked. [2022-12-14 10:46:16,092 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [905508026] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 10:46:16,092 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [225942440] [2022-12-14 10:46:16,093 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-12-14 10:46:16,093 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 10:46:16,093 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:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) 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) [2022-12-14 10:46:16,093 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 10:46:16,094 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [54, 34, 51] total 120 [2022-12-14 10:46:16,094 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1062506955] [2022-12-14 10:46:16,094 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 10:46:16,094 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 120 states [2022-12-14 10:46:16,095 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 10:46:16,095 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 120 interpolants. [2022-12-14 10:46:16,096 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=411, Invalid=13869, Unknown=0, NotChecked=0, Total=14280 [2022-12-14 10:46:16,096 INFO L87 Difference]: Start difference. First operand 85 states and 124 transitions. Second operand has 120 states, 115 states have (on average 1.5391304347826087) internal successors, (177), 75 states have internal predecessors, (177), 33 states have call successors, (33), 1 states have call predecessors, (33), 30 states have return successors, (46), 45 states have call predecessors, (46), 33 states have call successors, (46) [2022-12-14 10:46:19,737 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 10:46:19,737 INFO L93 Difference]: Finished difference Result 101 states and 144 transitions. [2022-12-14 10:46:19,737 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2022-12-14 10:46:19,737 INFO L78 Accepts]: Start accepts. Automaton has has 120 states, 115 states have (on average 1.5391304347826087) internal successors, (177), 75 states have internal predecessors, (177), 33 states have call successors, (33), 1 states have call predecessors, (33), 30 states have return successors, (46), 45 states have call predecessors, (46), 33 states have call successors, (46) Word has length 117 [2022-12-14 10:46:19,737 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 10:46:19,738 INFO L225 Difference]: With dead ends: 101 [2022-12-14 10:46:19,738 INFO L226 Difference]: Without dead ends: 95 [2022-12-14 10:46:19,739 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 324 GetRequests, 155 SyntacticMatches, 15 SemanticMatches, 154 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5551 ImplicationChecksByTransitivity, 8.2s TimeCoverageRelationStatistics Valid=1875, Invalid=22305, Unknown=0, NotChecked=0, Total=24180 [2022-12-14 10:46:19,740 INFO L413 NwaCegarLoop]: 25 mSDtfsCounter, 707 mSDsluCounter, 949 mSDsCounter, 0 mSdLazyCounter, 3516 mSolverCounterSat, 394 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 709 SdHoareTripleChecker+Valid, 974 SdHoareTripleChecker+Invalid, 3910 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 394 IncrementalHoareTripleChecker+Valid, 3516 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.7s IncrementalHoareTripleChecker+Time [2022-12-14 10:46:19,740 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [709 Valid, 974 Invalid, 3910 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [394 Valid, 3516 Invalid, 0 Unknown, 0 Unchecked, 1.7s Time] [2022-12-14 10:46:19,740 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2022-12-14 10:46:19,749 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 83. [2022-12-14 10:46:19,750 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 83 states, 56 states have (on average 1.0714285714285714) internal successors, (60), 57 states have internal predecessors, (60), 8 states have call successors, (8), 4 states have call predecessors, (8), 18 states have return successors, (48), 21 states have call predecessors, (48), 8 states have call successors, (48) [2022-12-14 10:46:19,750 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 116 transitions. [2022-12-14 10:46:19,751 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 116 transitions. Word has length 117 [2022-12-14 10:46:19,751 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 10:46:19,751 INFO L495 AbstractCegarLoop]: Abstraction has 83 states and 116 transitions. [2022-12-14 10:46:19,751 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 120 states, 115 states have (on average 1.5391304347826087) internal successors, (177), 75 states have internal predecessors, (177), 33 states have call successors, (33), 1 states have call predecessors, (33), 30 states have return successors, (46), 45 states have call predecessors, (46), 33 states have call successors, (46) [2022-12-14 10:46:19,751 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 116 transitions. [2022-12-14 10:46:19,752 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 153 [2022-12-14 10:46:19,752 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 10:46:19,752 INFO L195 NwaCegarLoop]: trace histogram [21, 21, 21, 19, 19, 19, 19, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 10:46:19,756 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2022-12-14 10:46:19,952 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2022-12-14 10:46:19,953 INFO L420 AbstractCegarLoop]: === Iteration 26 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 10:46:19,954 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 10:46:19,954 INFO L85 PathProgramCache]: Analyzing trace with hash 2036987738, now seen corresponding path program 23 times [2022-12-14 10:46:19,955 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 10:46:19,955 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [664974966] [2022-12-14 10:46:19,955 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 10:46:19,955 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 10:46:19,991 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 10:46:23,539 INFO L134 CoverageAnalysis]: Checked inductivity of 1392 backedges. 0 proven. 1178 refuted. 0 times theorem prover too weak. 214 trivial. 0 not checked. [2022-12-14 10:46:23,539 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 10:46:23,539 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [664974966] [2022-12-14 10:46:23,539 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [664974966] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 10:46:23,539 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1366345550] [2022-12-14 10:46:23,539 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 10:46:23,540 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 10:46:23,540 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 10:46:23,540 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 10:46:23,541 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2022-12-14 10:46:23,729 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 25 check-sat command(s) [2022-12-14 10:46:23,729 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 10:46:23,733 WARN L261 TraceCheckSpWp]: Trace formula consists of 444 conjuncts, 253 conjunts are in the unsatisfiable core [2022-12-14 10:46:23,736 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 10:46:26,516 INFO L134 CoverageAnalysis]: Checked inductivity of 1392 backedges. 27 proven. 621 refuted. 0 times theorem prover too weak. 744 trivial. 0 not checked. [2022-12-14 10:46:26,516 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 10:46:35,931 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1366345550] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 10:46:35,931 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [916205835] [2022-12-14 10:46:35,932 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-12-14 10:46:35,932 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 10:46:35,933 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:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) 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) [2022-12-14 10:46:35,933 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-12-14 10:46:35,933 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [69, 36] total 103 [2022-12-14 10:46:35,933 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [130327458] [2022-12-14 10:46:35,933 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-12-14 10:46:35,934 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 103 states [2022-12-14 10:46:35,934 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 10:46:35,935 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 103 interpolants. [2022-12-14 10:46:35,935 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=497, Invalid=19525, Unknown=0, NotChecked=0, Total=20022 [2022-12-14 10:46:35,936 INFO L87 Difference]: Start difference. First operand 83 states and 116 transitions. Second operand has 103 states, 99 states have (on average 1.4545454545454546) internal successors, (144), 67 states have internal predecessors, (144), 23 states have call successors, (23), 1 states have call predecessors, (23), 34 states have return successors, (36), 36 states have call predecessors, (36), 23 states have call successors, (36) [2022-12-14 10:46:39,264 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 10:46:39,264 INFO L93 Difference]: Finished difference Result 96 states and 136 transitions. [2022-12-14 10:46:39,264 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2022-12-14 10:46:39,264 INFO L78 Accepts]: Start accepts. Automaton has has 103 states, 99 states have (on average 1.4545454545454546) internal successors, (144), 67 states have internal predecessors, (144), 23 states have call successors, (23), 1 states have call predecessors, (23), 34 states have return successors, (36), 36 states have call predecessors, (36), 23 states have call successors, (36) Word has length 152 [2022-12-14 10:46:39,264 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 10:46:39,265 INFO L225 Difference]: With dead ends: 96 [2022-12-14 10:46:39,265 INFO L226 Difference]: Without dead ends: 92 [2022-12-14 10:46:39,267 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 367 GetRequests, 179 SyntacticMatches, 17 SemanticMatches, 171 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6050 ImplicationChecksByTransitivity, 11.7s TimeCoverageRelationStatistics Valid=2034, Invalid=27722, Unknown=0, NotChecked=0, Total=29756 [2022-12-14 10:46:39,267 INFO L413 NwaCegarLoop]: 24 mSDtfsCounter, 574 mSDsluCounter, 1220 mSDsCounter, 0 mSdLazyCounter, 3906 mSolverCounterSat, 285 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 575 SdHoareTripleChecker+Valid, 1244 SdHoareTripleChecker+Invalid, 4191 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 285 IncrementalHoareTripleChecker+Valid, 3906 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.6s IncrementalHoareTripleChecker+Time [2022-12-14 10:46:39,268 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [575 Valid, 1244 Invalid, 4191 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [285 Valid, 3906 Invalid, 0 Unknown, 0 Unchecked, 1.6s Time] [2022-12-14 10:46:39,268 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2022-12-14 10:46:39,281 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 88. [2022-12-14 10:46:39,281 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 88 states, 59 states have (on average 1.0677966101694916) internal successors, (63), 60 states have internal predecessors, (63), 9 states have call successors, (9), 4 states have call predecessors, (9), 19 states have return successors, (57), 23 states have call predecessors, (57), 9 states have call successors, (57) [2022-12-14 10:46:39,281 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 129 transitions. [2022-12-14 10:46:39,282 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 129 transitions. Word has length 152 [2022-12-14 10:46:39,282 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 10:46:39,282 INFO L495 AbstractCegarLoop]: Abstraction has 88 states and 129 transitions. [2022-12-14 10:46:39,282 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 103 states, 99 states have (on average 1.4545454545454546) internal successors, (144), 67 states have internal predecessors, (144), 23 states have call successors, (23), 1 states have call predecessors, (23), 34 states have return successors, (36), 36 states have call predecessors, (36), 23 states have call successors, (36) [2022-12-14 10:46:39,282 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 129 transitions. [2022-12-14 10:46:39,283 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2022-12-14 10:46:39,283 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 10:46:39,283 INFO L195 NwaCegarLoop]: trace histogram [17, 17, 17, 15, 15, 15, 15, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 10:46:39,289 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Forceful destruction successful, exit code 0 [2022-12-14 10:46:39,483 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2022-12-14 10:46:39,484 INFO L420 AbstractCegarLoop]: === Iteration 27 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 10:46:39,484 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 10:46:39,485 INFO L85 PathProgramCache]: Analyzing trace with hash 430880826, now seen corresponding path program 24 times [2022-12-14 10:46:39,485 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 10:46:39,485 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [273379303] [2022-12-14 10:46:39,485 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 10:46:39,485 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 10:46:39,530 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 10:46:41,847 INFO L134 CoverageAnalysis]: Checked inductivity of 890 backedges. 0 proven. 750 refuted. 0 times theorem prover too weak. 140 trivial. 0 not checked. [2022-12-14 10:46:41,847 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 10:46:41,847 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [273379303] [2022-12-14 10:46:41,847 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [273379303] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 10:46:41,847 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [754988595] [2022-12-14 10:46:41,847 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 10:46:41,847 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 10:46:41,848 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 10:46:41,848 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 10:46:41,849 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2022-12-14 10:46:42,008 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 10:46:42,008 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 10:46:42,011 WARN L261 TraceCheckSpWp]: Trace formula consists of 368 conjuncts, 205 conjunts are in the unsatisfiable core [2022-12-14 10:46:42,013 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 10:46:44,344 INFO L134 CoverageAnalysis]: Checked inductivity of 890 backedges. 13 proven. 416 refuted. 0 times theorem prover too weak. 461 trivial. 0 not checked. [2022-12-14 10:46:44,345 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 10:46:51,947 INFO L134 CoverageAnalysis]: Checked inductivity of 890 backedges. 50 proven. 700 refuted. 0 times theorem prover too weak. 140 trivial. 0 not checked. [2022-12-14 10:46:51,947 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [754988595] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 10:46:51,947 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [72060056] [2022-12-14 10:46:51,948 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-12-14 10:46:51,949 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 10:46:51,949 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:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) 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) [2022-12-14 10:46:51,949 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 10:46:51,949 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [57, 36, 54] total 127 [2022-12-14 10:46:51,949 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [681416191] [2022-12-14 10:46:51,949 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 10:46:51,950 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 127 states [2022-12-14 10:46:51,950 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 10:46:51,951 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 127 interpolants. [2022-12-14 10:46:51,952 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=435, Invalid=15567, Unknown=0, NotChecked=0, Total=16002 [2022-12-14 10:46:51,952 INFO L87 Difference]: Start difference. First operand 88 states and 129 transitions. Second operand has 127 states, 122 states have (on average 1.540983606557377) internal successors, (188), 79 states have internal predecessors, (188), 35 states have call successors, (35), 1 states have call predecessors, (35), 32 states have return successors, (49), 48 states have call predecessors, (49), 35 states have call successors, (49) [2022-12-14 10:46:55,906 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 10:46:55,906 INFO L93 Difference]: Finished difference Result 104 states and 149 transitions. [2022-12-14 10:46:55,906 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2022-12-14 10:46:55,906 INFO L78 Accepts]: Start accepts. Automaton has has 127 states, 122 states have (on average 1.540983606557377) internal successors, (188), 79 states have internal predecessors, (188), 35 states have call successors, (35), 1 states have call predecessors, (35), 32 states have return successors, (49), 48 states have call predecessors, (49), 35 states have call successors, (49) Word has length 124 [2022-12-14 10:46:55,907 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 10:46:55,907 INFO L225 Difference]: With dead ends: 104 [2022-12-14 10:46:55,907 INFO L226 Difference]: Without dead ends: 98 [2022-12-14 10:46:55,908 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 343 GetRequests, 164 SyntacticMatches, 16 SemanticMatches, 163 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6235 ImplicationChecksByTransitivity, 9.1s TimeCoverageRelationStatistics Valid=2060, Invalid=25000, Unknown=0, NotChecked=0, Total=27060 [2022-12-14 10:46:55,909 INFO L413 NwaCegarLoop]: 26 mSDtfsCounter, 672 mSDsluCounter, 1268 mSDsCounter, 0 mSdLazyCounter, 4633 mSolverCounterSat, 372 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 674 SdHoareTripleChecker+Valid, 1294 SdHoareTripleChecker+Invalid, 5005 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 372 IncrementalHoareTripleChecker+Valid, 4633 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.0s IncrementalHoareTripleChecker+Time [2022-12-14 10:46:55,909 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [674 Valid, 1294 Invalid, 5005 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [372 Valid, 4633 Invalid, 0 Unknown, 0 Unchecked, 2.0s Time] [2022-12-14 10:46:55,909 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2022-12-14 10:46:55,919 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 86. [2022-12-14 10:46:55,919 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 86 states, 58 states have (on average 1.0689655172413792) internal successors, (62), 59 states have internal predecessors, (62), 8 states have call successors, (8), 4 states have call predecessors, (8), 19 states have return successors, (51), 22 states have call predecessors, (51), 8 states have call successors, (51) [2022-12-14 10:46:55,920 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 121 transitions. [2022-12-14 10:46:55,920 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 121 transitions. Word has length 124 [2022-12-14 10:46:55,920 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 10:46:55,920 INFO L495 AbstractCegarLoop]: Abstraction has 86 states and 121 transitions. [2022-12-14 10:46:55,920 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 127 states, 122 states have (on average 1.540983606557377) internal successors, (188), 79 states have internal predecessors, (188), 35 states have call successors, (35), 1 states have call predecessors, (35), 32 states have return successors, (49), 48 states have call predecessors, (49), 35 states have call successors, (49) [2022-12-14 10:46:55,920 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 121 transitions. [2022-12-14 10:46:55,921 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 132 [2022-12-14 10:46:55,921 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 10:46:55,921 INFO L195 NwaCegarLoop]: trace histogram [18, 18, 18, 16, 16, 16, 16, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 10:46:55,926 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Ended with exit code 0 [2022-12-14 10:46:56,121 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26,25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 10:46:56,122 INFO L420 AbstractCegarLoop]: === Iteration 28 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 10:46:56,123 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 10:46:56,123 INFO L85 PathProgramCache]: Analyzing trace with hash 2065134234, now seen corresponding path program 25 times [2022-12-14 10:46:56,123 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 10:46:56,124 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [109483267] [2022-12-14 10:46:56,124 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 10:46:56,124 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 10:46:56,171 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 10:46:58,642 INFO L134 CoverageAnalysis]: Checked inductivity of 1005 backedges. 0 proven. 848 refuted. 0 times theorem prover too weak. 157 trivial. 0 not checked. [2022-12-14 10:46:58,642 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 10:46:58,642 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [109483267] [2022-12-14 10:46:58,642 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [109483267] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 10:46:58,642 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [613835457] [2022-12-14 10:46:58,642 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 10:46:58,643 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 10:46:58,643 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 10:46:58,643 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 10:46:58,644 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2022-12-14 10:46:58,790 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 10:46:58,793 WARN L261 TraceCheckSpWp]: Trace formula consists of 387 conjuncts, 217 conjunts are in the unsatisfiable core [2022-12-14 10:46:58,796 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 10:47:01,639 INFO L134 CoverageAnalysis]: Checked inductivity of 1005 backedges. 14 proven. 468 refuted. 0 times theorem prover too weak. 523 trivial. 0 not checked. [2022-12-14 10:47:01,640 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 10:47:11,142 INFO L134 CoverageAnalysis]: Checked inductivity of 1005 backedges. 53 proven. 795 refuted. 0 times theorem prover too weak. 157 trivial. 0 not checked. [2022-12-14 10:47:11,143 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [613835457] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 10:47:11,143 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1821654649] [2022-12-14 10:47:11,144 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-12-14 10:47:11,144 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 10:47:11,144 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:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) 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) [2022-12-14 10:47:11,144 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 10:47:11,144 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [60, 38, 57] total 134 [2022-12-14 10:47:11,144 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [25987158] [2022-12-14 10:47:11,144 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 10:47:11,145 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 134 states [2022-12-14 10:47:11,145 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 10:47:11,146 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 134 interpolants. [2022-12-14 10:47:11,146 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=459, Invalid=17363, Unknown=0, NotChecked=0, Total=17822 [2022-12-14 10:47:11,146 INFO L87 Difference]: Start difference. First operand 86 states and 121 transitions. Second operand has 134 states, 129 states have (on average 1.5426356589147288) internal successors, (199), 83 states have internal predecessors, (199), 37 states have call successors, (37), 1 states have call predecessors, (37), 34 states have return successors, (52), 51 states have call predecessors, (52), 37 states have call successors, (52) [2022-12-14 10:47:16,248 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 10:47:16,248 INFO L93 Difference]: Finished difference Result 105 states and 151 transitions. [2022-12-14 10:47:16,248 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2022-12-14 10:47:16,248 INFO L78 Accepts]: Start accepts. Automaton has has 134 states, 129 states have (on average 1.5426356589147288) internal successors, (199), 83 states have internal predecessors, (199), 37 states have call successors, (37), 1 states have call predecessors, (37), 34 states have return successors, (52), 51 states have call predecessors, (52), 37 states have call successors, (52) Word has length 131 [2022-12-14 10:47:16,248 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 10:47:16,249 INFO L225 Difference]: With dead ends: 105 [2022-12-14 10:47:16,249 INFO L226 Difference]: Without dead ends: 99 [2022-12-14 10:47:16,250 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 362 GetRequests, 173 SyntacticMatches, 17 SemanticMatches, 172 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6960 ImplicationChecksByTransitivity, 10.8s TimeCoverageRelationStatistics Valid=2253, Invalid=27849, Unknown=0, NotChecked=0, Total=30102 [2022-12-14 10:47:16,250 INFO L413 NwaCegarLoop]: 27 mSDtfsCounter, 1061 mSDsluCounter, 1495 mSDsCounter, 0 mSdLazyCounter, 5437 mSolverCounterSat, 581 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1063 SdHoareTripleChecker+Valid, 1522 SdHoareTripleChecker+Invalid, 6018 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 581 IncrementalHoareTripleChecker+Valid, 5437 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.7s IncrementalHoareTripleChecker+Time [2022-12-14 10:47:16,251 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1063 Valid, 1522 Invalid, 6018 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [581 Valid, 5437 Invalid, 0 Unknown, 0 Unchecked, 2.7s Time] [2022-12-14 10:47:16,251 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2022-12-14 10:47:16,261 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 89. [2022-12-14 10:47:16,262 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 89 states, 60 states have (on average 1.0666666666666667) internal successors, (64), 61 states have internal predecessors, (64), 8 states have call successors, (8), 4 states have call predecessors, (8), 20 states have return successors, (54), 23 states have call predecessors, (54), 8 states have call successors, (54) [2022-12-14 10:47:16,262 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 126 transitions. [2022-12-14 10:47:16,262 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 126 transitions. Word has length 131 [2022-12-14 10:47:16,262 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 10:47:16,262 INFO L495 AbstractCegarLoop]: Abstraction has 89 states and 126 transitions. [2022-12-14 10:47:16,263 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 134 states, 129 states have (on average 1.5426356589147288) internal successors, (199), 83 states have internal predecessors, (199), 37 states have call successors, (37), 1 states have call predecessors, (37), 34 states have return successors, (52), 51 states have call predecessors, (52), 37 states have call successors, (52) [2022-12-14 10:47:16,263 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 126 transitions. [2022-12-14 10:47:16,263 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 167 [2022-12-14 10:47:16,263 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 10:47:16,263 INFO L195 NwaCegarLoop]: trace histogram [23, 23, 23, 21, 21, 21, 21, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 10:47:16,269 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Ended with exit code 0 [2022-12-14 10:47:16,464 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2022-12-14 10:47:16,465 INFO L420 AbstractCegarLoop]: === Iteration 29 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 10:47:16,466 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 10:47:16,466 INFO L85 PathProgramCache]: Analyzing trace with hash -1641903222, now seen corresponding path program 26 times [2022-12-14 10:47:16,467 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 10:47:16,467 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1641366555] [2022-12-14 10:47:16,467 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 10:47:16,467 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 10:47:16,521 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 10:47:20,397 INFO L134 CoverageAnalysis]: Checked inductivity of 1685 backedges. 0 proven. 1425 refuted. 0 times theorem prover too weak. 260 trivial. 0 not checked. [2022-12-14 10:47:20,397 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 10:47:20,397 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1641366555] [2022-12-14 10:47:20,397 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1641366555] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 10:47:20,397 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1905250874] [2022-12-14 10:47:20,397 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 10:47:20,397 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 10:47:20,398 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 10:47:20,398 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 10:47:20,399 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2022-12-14 10:47:20,608 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 28 check-sat command(s) [2022-12-14 10:47:20,608 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 10:47:20,615 WARN L261 TraceCheckSpWp]: Trace formula consists of 482 conjuncts, 277 conjunts are in the unsatisfiable core [2022-12-14 10:47:20,618 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 10:47:23,540 INFO L134 CoverageAnalysis]: Checked inductivity of 1685 backedges. 15 proven. 765 refuted. 0 times theorem prover too weak. 905 trivial. 0 not checked. [2022-12-14 10:47:23,540 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 10:47:35,800 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1905250874] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 10:47:35,801 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [667899862] [2022-12-14 10:47:35,801 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-12-14 10:47:35,801 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 10:47:35,802 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:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) 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) [2022-12-14 10:47:35,802 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-12-14 10:47:35,802 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [74, 40] total 112 [2022-12-14 10:47:35,802 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [267857211] [2022-12-14 10:47:35,802 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-12-14 10:47:35,802 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 112 states [2022-12-14 10:47:35,802 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 10:47:35,803 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 112 interpolants. [2022-12-14 10:47:35,804 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=542, Invalid=23328, Unknown=0, NotChecked=0, Total=23870 [2022-12-14 10:47:35,804 INFO L87 Difference]: Start difference. First operand 89 states and 126 transitions. Second operand has 112 states, 108 states have (on average 1.4166666666666667) internal successors, (153), 72 states have internal predecessors, (153), 24 states have call successors, (24), 1 states have call predecessors, (24), 38 states have return successors, (40), 40 states have call predecessors, (40), 24 states have call successors, (40) [2022-12-14 10:47:39,478 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 10:47:39,478 INFO L93 Difference]: Finished difference Result 102 states and 146 transitions. [2022-12-14 10:47:39,478 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2022-12-14 10:47:39,478 INFO L78 Accepts]: Start accepts. Automaton has has 112 states, 108 states have (on average 1.4166666666666667) internal successors, (153), 72 states have internal predecessors, (153), 24 states have call successors, (24), 1 states have call predecessors, (24), 38 states have return successors, (40), 40 states have call predecessors, (40), 24 states have call successors, (40) Word has length 166 [2022-12-14 10:47:39,479 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 10:47:39,479 INFO L225 Difference]: With dead ends: 102 [2022-12-14 10:47:39,479 INFO L226 Difference]: Without dead ends: 98 [2022-12-14 10:47:39,481 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 405 GetRequests, 200 SyntacticMatches, 17 SemanticMatches, 188 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7412 ImplicationChecksByTransitivity, 13.4s TimeCoverageRelationStatistics Valid=2388, Invalid=33522, Unknown=0, NotChecked=0, Total=35910 [2022-12-14 10:47:39,481 INFO L413 NwaCegarLoop]: 26 mSDtfsCounter, 243 mSDsluCounter, 1326 mSDsCounter, 0 mSdLazyCounter, 4285 mSolverCounterSat, 120 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 244 SdHoareTripleChecker+Valid, 1352 SdHoareTripleChecker+Invalid, 4405 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 120 IncrementalHoareTripleChecker+Valid, 4285 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.7s IncrementalHoareTripleChecker+Time [2022-12-14 10:47:39,481 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [244 Valid, 1352 Invalid, 4405 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [120 Valid, 4285 Invalid, 0 Unknown, 0 Unchecked, 1.7s Time] [2022-12-14 10:47:39,482 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2022-12-14 10:47:39,509 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 94. [2022-12-14 10:47:39,510 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 94 states, 63 states have (on average 1.0634920634920635) internal successors, (67), 64 states have internal predecessors, (67), 9 states have call successors, (9), 4 states have call predecessors, (9), 21 states have return successors, (63), 25 states have call predecessors, (63), 9 states have call successors, (63) [2022-12-14 10:47:39,511 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 139 transitions. [2022-12-14 10:47:39,511 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 139 transitions. Word has length 166 [2022-12-14 10:47:39,511 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 10:47:39,511 INFO L495 AbstractCegarLoop]: Abstraction has 94 states and 139 transitions. [2022-12-14 10:47:39,511 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 112 states, 108 states have (on average 1.4166666666666667) internal successors, (153), 72 states have internal predecessors, (153), 24 states have call successors, (24), 1 states have call predecessors, (24), 38 states have return successors, (40), 40 states have call predecessors, (40), 24 states have call successors, (40) [2022-12-14 10:47:39,511 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 139 transitions. [2022-12-14 10:47:39,513 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 139 [2022-12-14 10:47:39,513 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 10:47:39,513 INFO L195 NwaCegarLoop]: trace histogram [19, 19, 19, 17, 17, 17, 17, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 10:47:39,518 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Ended with exit code 0 [2022-12-14 10:47:39,713 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2022-12-14 10:47:39,714 INFO L420 AbstractCegarLoop]: === Iteration 30 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 10:47:39,714 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 10:47:39,714 INFO L85 PathProgramCache]: Analyzing trace with hash -1491843990, now seen corresponding path program 27 times [2022-12-14 10:47:39,714 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 10:47:39,714 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [149299170] [2022-12-14 10:47:39,714 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 10:47:39,714 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 10:47:39,735 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 10:47:42,452 INFO L134 CoverageAnalysis]: Checked inductivity of 1127 backedges. 0 proven. 952 refuted. 0 times theorem prover too weak. 175 trivial. 0 not checked. [2022-12-14 10:47:42,452 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 10:47:42,452 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [149299170] [2022-12-14 10:47:42,452 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [149299170] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 10:47:42,453 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2113524572] [2022-12-14 10:47:42,453 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 10:47:42,453 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 10:47:42,453 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 10:47:42,453 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 10:47:42,454 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2022-12-14 10:47:42,688 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 10:47:42,688 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 10:47:42,693 WARN L261 TraceCheckSpWp]: Trace formula consists of 406 conjuncts, 229 conjunts are in the unsatisfiable core [2022-12-14 10:47:42,695 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 10:47:45,828 INFO L134 CoverageAnalysis]: Checked inductivity of 1127 backedges. 15 proven. 523 refuted. 0 times theorem prover too weak. 589 trivial. 0 not checked. [2022-12-14 10:47:45,829 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 10:47:55,588 INFO L134 CoverageAnalysis]: Checked inductivity of 1127 backedges. 56 proven. 896 refuted. 0 times theorem prover too weak. 175 trivial. 0 not checked. [2022-12-14 10:47:55,589 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2113524572] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 10:47:55,589 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1245058348] [2022-12-14 10:47:55,590 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-12-14 10:47:55,590 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 10:47:55,590 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:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) 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) [2022-12-14 10:47:55,590 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 10:47:55,590 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [63, 40, 60] total 141 [2022-12-14 10:47:55,591 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [983761792] [2022-12-14 10:47:55,591 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 10:47:55,591 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 141 states [2022-12-14 10:47:55,591 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 10:47:55,592 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 141 interpolants. [2022-12-14 10:47:55,593 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=483, Invalid=19257, Unknown=0, NotChecked=0, Total=19740 [2022-12-14 10:47:55,593 INFO L87 Difference]: Start difference. First operand 94 states and 139 transitions. Second operand has 141 states, 136 states have (on average 1.5441176470588236) internal successors, (210), 87 states have internal predecessors, (210), 39 states have call successors, (39), 1 states have call predecessors, (39), 36 states have return successors, (55), 54 states have call predecessors, (55), 39 states have call successors, (55) [2022-12-14 10:48:01,556 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 10:48:01,556 INFO L93 Difference]: Finished difference Result 110 states and 159 transitions. [2022-12-14 10:48:01,556 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2022-12-14 10:48:01,557 INFO L78 Accepts]: Start accepts. Automaton has has 141 states, 136 states have (on average 1.5441176470588236) internal successors, (210), 87 states have internal predecessors, (210), 39 states have call successors, (39), 1 states have call predecessors, (39), 36 states have return successors, (55), 54 states have call predecessors, (55), 39 states have call successors, (55) Word has length 138 [2022-12-14 10:48:01,557 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 10:48:01,557 INFO L225 Difference]: With dead ends: 110 [2022-12-14 10:48:01,558 INFO L226 Difference]: Without dead ends: 104 [2022-12-14 10:48:01,559 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 381 GetRequests, 182 SyntacticMatches, 18 SemanticMatches, 181 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7724 ImplicationChecksByTransitivity, 12.1s TimeCoverageRelationStatistics Valid=2454, Invalid=30852, Unknown=0, NotChecked=0, Total=33306 [2022-12-14 10:48:01,559 INFO L413 NwaCegarLoop]: 28 mSDtfsCounter, 998 mSDsluCounter, 1563 mSDsCounter, 0 mSdLazyCounter, 5588 mSolverCounterSat, 544 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1000 SdHoareTripleChecker+Valid, 1591 SdHoareTripleChecker+Invalid, 6132 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 544 IncrementalHoareTripleChecker+Valid, 5588 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.1s IncrementalHoareTripleChecker+Time [2022-12-14 10:48:01,559 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1000 Valid, 1591 Invalid, 6132 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [544 Valid, 5588 Invalid, 0 Unknown, 0 Unchecked, 3.1s Time] [2022-12-14 10:48:01,560 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2022-12-14 10:48:01,573 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 92. [2022-12-14 10:48:01,574 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 92 states, 62 states have (on average 1.064516129032258) internal successors, (66), 63 states have internal predecessors, (66), 8 states have call successors, (8), 4 states have call predecessors, (8), 21 states have return successors, (57), 24 states have call predecessors, (57), 8 states have call successors, (57) [2022-12-14 10:48:01,574 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 131 transitions. [2022-12-14 10:48:01,574 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 131 transitions. Word has length 138 [2022-12-14 10:48:01,574 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 10:48:01,574 INFO L495 AbstractCegarLoop]: Abstraction has 92 states and 131 transitions. [2022-12-14 10:48:01,575 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 141 states, 136 states have (on average 1.5441176470588236) internal successors, (210), 87 states have internal predecessors, (210), 39 states have call successors, (39), 1 states have call predecessors, (39), 36 states have return successors, (55), 54 states have call predecessors, (55), 39 states have call successors, (55) [2022-12-14 10:48:01,575 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 131 transitions. [2022-12-14 10:48:01,575 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 174 [2022-12-14 10:48:01,575 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 10:48:01,575 INFO L195 NwaCegarLoop]: trace histogram [24, 24, 24, 22, 22, 22, 22, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 10:48:01,582 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Ended with exit code 0 [2022-12-14 10:48:01,776 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 10:48:01,776 INFO L420 AbstractCegarLoop]: === Iteration 31 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 10:48:01,776 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 10:48:01,776 INFO L85 PathProgramCache]: Analyzing trace with hash -1278142646, now seen corresponding path program 28 times [2022-12-14 10:48:01,776 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 10:48:01,776 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [13390842] [2022-12-14 10:48:01,776 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 10:48:01,776 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 10:48:01,800 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 10:48:06,168 INFO L134 CoverageAnalysis]: Checked inductivity of 1842 backedges. 0 proven. 1562 refuted. 0 times theorem prover too weak. 280 trivial. 0 not checked. [2022-12-14 10:48:06,169 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 10:48:06,169 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [13390842] [2022-12-14 10:48:06,169 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [13390842] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 10:48:06,169 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1417817108] [2022-12-14 10:48:06,169 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 10:48:06,169 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 10:48:06,169 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 10:48:06,170 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 10:48:06,170 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Waiting until timeout for monitored process [2022-12-14 10:48:06,365 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 10:48:06,370 WARN L261 TraceCheckSpWp]: Trace formula consists of 501 conjuncts, 289 conjunts are in the unsatisfiable core [2022-12-14 10:48:06,372 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 10:48:09,768 INFO L134 CoverageAnalysis]: Checked inductivity of 1842 backedges. 16 proven. 835 refuted. 0 times theorem prover too weak. 991 trivial. 0 not checked. [2022-12-14 10:48:09,768 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 10:48:22,536 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1417817108] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 10:48:22,536 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1471095577] [2022-12-14 10:48:22,537 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-12-14 10:48:22,537 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 10:48:22,538 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:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) 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) [2022-12-14 10:48:22,538 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-12-14 10:48:22,538 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [78, 42] total 118 [2022-12-14 10:48:22,538 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1177385715] [2022-12-14 10:48:22,538 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-12-14 10:48:22,539 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 118 states [2022-12-14 10:48:22,539 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 10:48:22,540 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 118 interpolants. [2022-12-14 10:48:22,541 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=569, Invalid=25837, Unknown=0, NotChecked=0, Total=26406 [2022-12-14 10:48:22,541 INFO L87 Difference]: Start difference. First operand 92 states and 131 transitions. Second operand has 118 states, 114 states have (on average 1.4298245614035088) internal successors, (163), 76 states have internal predecessors, (163), 26 states have call successors, (26), 1 states have call predecessors, (26), 40 states have return successors, (42), 42 states have call predecessors, (42), 26 states have call successors, (42) [2022-12-14 10:48:27,606 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 10:48:27,606 INFO L93 Difference]: Finished difference Result 105 states and 151 transitions. [2022-12-14 10:48:27,606 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2022-12-14 10:48:27,606 INFO L78 Accepts]: Start accepts. Automaton has has 118 states, 114 states have (on average 1.4298245614035088) internal successors, (163), 76 states have internal predecessors, (163), 26 states have call successors, (26), 1 states have call predecessors, (26), 40 states have return successors, (42), 42 states have call predecessors, (42), 26 states have call successors, (42) Word has length 173 [2022-12-14 10:48:27,607 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 10:48:27,608 INFO L225 Difference]: With dead ends: 105 [2022-12-14 10:48:27,608 INFO L226 Difference]: Without dead ends: 101 [2022-12-14 10:48:27,610 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 424 GetRequests, 208 SyntacticMatches, 18 SemanticMatches, 198 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8199 ImplicationChecksByTransitivity, 15.5s TimeCoverageRelationStatistics Valid=2631, Invalid=37169, Unknown=0, NotChecked=0, Total=39800 [2022-12-14 10:48:27,611 INFO L413 NwaCegarLoop]: 28 mSDtfsCounter, 939 mSDsluCounter, 1538 mSDsCounter, 0 mSdLazyCounter, 4539 mSolverCounterSat, 468 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 941 SdHoareTripleChecker+Valid, 1566 SdHoareTripleChecker+Invalid, 5007 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 468 IncrementalHoareTripleChecker+Valid, 4539 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.4s IncrementalHoareTripleChecker+Time [2022-12-14 10:48:27,611 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [941 Valid, 1566 Invalid, 5007 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [468 Valid, 4539 Invalid, 0 Unknown, 0 Unchecked, 2.4s Time] [2022-12-14 10:48:27,611 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 101 states. [2022-12-14 10:48:27,633 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 101 to 97. [2022-12-14 10:48:27,633 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 97 states, 65 states have (on average 1.0615384615384615) internal successors, (69), 66 states have internal predecessors, (69), 9 states have call successors, (9), 4 states have call predecessors, (9), 22 states have return successors, (66), 26 states have call predecessors, (66), 9 states have call successors, (66) [2022-12-14 10:48:27,634 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 144 transitions. [2022-12-14 10:48:27,634 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 144 transitions. Word has length 173 [2022-12-14 10:48:27,634 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 10:48:27,634 INFO L495 AbstractCegarLoop]: Abstraction has 97 states and 144 transitions. [2022-12-14 10:48:27,634 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 118 states, 114 states have (on average 1.4298245614035088) internal successors, (163), 76 states have internal predecessors, (163), 26 states have call successors, (26), 1 states have call predecessors, (26), 40 states have return successors, (42), 42 states have call predecessors, (42), 26 states have call successors, (42) [2022-12-14 10:48:27,634 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 144 transitions. [2022-12-14 10:48:27,635 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 146 [2022-12-14 10:48:27,636 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 10:48:27,636 INFO L195 NwaCegarLoop]: trace histogram [20, 20, 20, 18, 18, 18, 18, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 10:48:27,642 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Forceful destruction successful, exit code 0 [2022-12-14 10:48:27,836 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable30 [2022-12-14 10:48:27,837 INFO L420 AbstractCegarLoop]: === Iteration 32 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 10:48:27,838 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 10:48:27,838 INFO L85 PathProgramCache]: Analyzing trace with hash -1492671894, now seen corresponding path program 29 times [2022-12-14 10:48:27,839 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 10:48:27,839 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1106116310] [2022-12-14 10:48:27,839 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 10:48:27,840 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 10:48:27,892 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 10:48:31,097 INFO L134 CoverageAnalysis]: Checked inductivity of 1256 backedges. 0 proven. 1062 refuted. 0 times theorem prover too weak. 194 trivial. 0 not checked. [2022-12-14 10:48:31,098 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 10:48:31,098 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1106116310] [2022-12-14 10:48:31,098 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1106116310] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 10:48:31,098 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [287741934] [2022-12-14 10:48:31,098 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 10:48:31,098 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 10:48:31,098 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 10:48:31,099 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 10:48:31,100 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Waiting until timeout for monitored process [2022-12-14 10:48:31,343 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 20 check-sat command(s) [2022-12-14 10:48:31,343 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 10:48:31,349 WARN L261 TraceCheckSpWp]: Trace formula consists of 425 conjuncts, 241 conjunts are in the unsatisfiable core [2022-12-14 10:48:31,351 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 10:48:34,475 INFO L134 CoverageAnalysis]: Checked inductivity of 1256 backedges. 16 proven. 581 refuted. 0 times theorem prover too weak. 659 trivial. 0 not checked. [2022-12-14 10:48:34,475 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 10:48:45,453 INFO L134 CoverageAnalysis]: Checked inductivity of 1256 backedges. 59 proven. 1003 refuted. 0 times theorem prover too weak. 194 trivial. 0 not checked. [2022-12-14 10:48:45,453 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [287741934] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 10:48:45,453 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [613928075] [2022-12-14 10:48:45,454 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-12-14 10:48:45,454 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 10:48:45,454 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:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) 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) [2022-12-14 10:48:45,455 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 10:48:45,455 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [66, 42, 63] total 148 [2022-12-14 10:48:45,455 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [118239046] [2022-12-14 10:48:45,455 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 10:48:45,456 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 148 states [2022-12-14 10:48:45,456 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 10:48:45,457 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 148 interpolants. [2022-12-14 10:48:45,457 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=507, Invalid=21249, Unknown=0, NotChecked=0, Total=21756 [2022-12-14 10:48:45,458 INFO L87 Difference]: Start difference. First operand 97 states and 144 transitions. Second operand has 148 states, 143 states have (on average 1.5454545454545454) internal successors, (221), 91 states have internal predecessors, (221), 41 states have call successors, (41), 1 states have call predecessors, (41), 38 states have return successors, (58), 57 states have call predecessors, (58), 41 states have call successors, (58) [2022-12-14 10:48:50,486 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 10:48:50,487 INFO L93 Difference]: Finished difference Result 113 states and 164 transitions. [2022-12-14 10:48:50,487 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2022-12-14 10:48:50,487 INFO L78 Accepts]: Start accepts. Automaton has has 148 states, 143 states have (on average 1.5454545454545454) internal successors, (221), 91 states have internal predecessors, (221), 41 states have call successors, (41), 1 states have call predecessors, (41), 38 states have return successors, (58), 57 states have call predecessors, (58), 41 states have call successors, (58) Word has length 145 [2022-12-14 10:48:50,487 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 10:48:50,488 INFO L225 Difference]: With dead ends: 113 [2022-12-14 10:48:50,488 INFO L226 Difference]: Without dead ends: 107 [2022-12-14 10:48:50,489 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 400 GetRequests, 191 SyntacticMatches, 19 SemanticMatches, 190 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8527 ImplicationChecksByTransitivity, 12.4s TimeCoverageRelationStatistics Valid=2663, Invalid=34009, Unknown=0, NotChecked=0, Total=36672 [2022-12-14 10:48:50,490 INFO L413 NwaCegarLoop]: 29 mSDtfsCounter, 912 mSDsluCounter, 1687 mSDsCounter, 0 mSdLazyCounter, 5914 mSolverCounterSat, 498 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 914 SdHoareTripleChecker+Valid, 1716 SdHoareTripleChecker+Invalid, 6412 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 498 IncrementalHoareTripleChecker+Valid, 5914 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.6s IncrementalHoareTripleChecker+Time [2022-12-14 10:48:50,490 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [914 Valid, 1716 Invalid, 6412 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [498 Valid, 5914 Invalid, 0 Unknown, 0 Unchecked, 2.6s Time] [2022-12-14 10:48:50,490 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 107 states. [2022-12-14 10:48:50,501 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 107 to 95. [2022-12-14 10:48:50,502 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 95 states, 64 states have (on average 1.0625) internal successors, (68), 65 states have internal predecessors, (68), 8 states have call successors, (8), 4 states have call predecessors, (8), 22 states have return successors, (60), 25 states have call predecessors, (60), 8 states have call successors, (60) [2022-12-14 10:48:50,502 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 136 transitions. [2022-12-14 10:48:50,502 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 136 transitions. Word has length 145 [2022-12-14 10:48:50,502 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 10:48:50,503 INFO L495 AbstractCegarLoop]: Abstraction has 95 states and 136 transitions. [2022-12-14 10:48:50,503 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 148 states, 143 states have (on average 1.5454545454545454) internal successors, (221), 91 states have internal predecessors, (221), 41 states have call successors, (41), 1 states have call predecessors, (41), 38 states have return successors, (58), 57 states have call predecessors, (58), 41 states have call successors, (58) [2022-12-14 10:48:50,503 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 136 transitions. [2022-12-14 10:48:50,504 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 153 [2022-12-14 10:48:50,504 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 10:48:50,504 INFO L195 NwaCegarLoop]: trace histogram [21, 21, 21, 19, 19, 19, 19, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 10:48:50,510 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Ended with exit code 0 [2022-12-14 10:48:50,704 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31,30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 10:48:50,704 INFO L420 AbstractCegarLoop]: === Iteration 33 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 10:48:50,705 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 10:48:50,705 INFO L85 PathProgramCache]: Analyzing trace with hash 1062836378, now seen corresponding path program 30 times [2022-12-14 10:48:50,705 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 10:48:50,705 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1136173594] [2022-12-14 10:48:50,705 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 10:48:50,705 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 10:48:50,725 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 10:48:54,090 INFO L134 CoverageAnalysis]: Checked inductivity of 1392 backedges. 0 proven. 1178 refuted. 0 times theorem prover too weak. 214 trivial. 0 not checked. [2022-12-14 10:48:54,090 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 10:48:54,091 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1136173594] [2022-12-14 10:48:54,091 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1136173594] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 10:48:54,091 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1776618196] [2022-12-14 10:48:54,091 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 10:48:54,091 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 10:48:54,091 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 10:48:54,092 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 10:48:54,092 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Waiting until timeout for monitored process [2022-12-14 10:48:54,315 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 10:48:54,315 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 10:48:54,319 WARN L261 TraceCheckSpWp]: Trace formula consists of 444 conjuncts, 253 conjunts are in the unsatisfiable core [2022-12-14 10:48:54,323 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 10:48:57,662 INFO L134 CoverageAnalysis]: Checked inductivity of 1392 backedges. 17 proven. 642 refuted. 0 times theorem prover too weak. 733 trivial. 0 not checked. [2022-12-14 10:48:57,662 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 10:49:09,337 INFO L134 CoverageAnalysis]: Checked inductivity of 1392 backedges. 62 proven. 1116 refuted. 0 times theorem prover too weak. 214 trivial. 0 not checked. [2022-12-14 10:49:09,337 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1776618196] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 10:49:09,337 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [932830354] [2022-12-14 10:49:09,338 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-12-14 10:49:09,338 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 10:49:09,338 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:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) 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) [2022-12-14 10:49:09,338 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 10:49:09,338 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [69, 44, 66] total 155 [2022-12-14 10:49:09,339 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2052031806] [2022-12-14 10:49:09,339 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 10:49:09,339 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 155 states [2022-12-14 10:49:09,339 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 10:49:09,340 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 155 interpolants. [2022-12-14 10:49:09,340 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=531, Invalid=23339, Unknown=0, NotChecked=0, Total=23870 [2022-12-14 10:49:09,341 INFO L87 Difference]: Start difference. First operand 95 states and 136 transitions. Second operand has 155 states, 150 states have (on average 1.5466666666666666) internal successors, (232), 95 states have internal predecessors, (232), 43 states have call successors, (43), 1 states have call predecessors, (43), 40 states have return successors, (61), 60 states have call predecessors, (61), 43 states have call successors, (61) [2022-12-14 10:49:14,437 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 10:49:14,437 INFO L93 Difference]: Finished difference Result 114 states and 166 transitions. [2022-12-14 10:49:14,437 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2022-12-14 10:49:14,437 INFO L78 Accepts]: Start accepts. Automaton has has 155 states, 150 states have (on average 1.5466666666666666) internal successors, (232), 95 states have internal predecessors, (232), 43 states have call successors, (43), 1 states have call predecessors, (43), 40 states have return successors, (61), 60 states have call predecessors, (61), 43 states have call successors, (61) Word has length 152 [2022-12-14 10:49:14,438 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 10:49:14,438 INFO L225 Difference]: With dead ends: 114 [2022-12-14 10:49:14,438 INFO L226 Difference]: Without dead ends: 108 [2022-12-14 10:49:14,440 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 419 GetRequests, 200 SyntacticMatches, 20 SemanticMatches, 199 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9371 ImplicationChecksByTransitivity, 13.2s TimeCoverageRelationStatistics Valid=2880, Invalid=37320, Unknown=0, NotChecked=0, Total=40200 [2022-12-14 10:49:14,440 INFO L413 NwaCegarLoop]: 29 mSDtfsCounter, 386 mSDsluCounter, 1650 mSDsCounter, 0 mSdLazyCounter, 6303 mSolverCounterSat, 246 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 389 SdHoareTripleChecker+Valid, 1679 SdHoareTripleChecker+Invalid, 6549 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 246 IncrementalHoareTripleChecker+Valid, 6303 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.6s IncrementalHoareTripleChecker+Time [2022-12-14 10:49:14,441 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [389 Valid, 1679 Invalid, 6549 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [246 Valid, 6303 Invalid, 0 Unknown, 0 Unchecked, 2.6s Time] [2022-12-14 10:49:14,441 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2022-12-14 10:49:14,464 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 98. [2022-12-14 10:49:14,464 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 98 states, 66 states have (on average 1.0606060606060606) internal successors, (70), 67 states have internal predecessors, (70), 8 states have call successors, (8), 4 states have call predecessors, (8), 23 states have return successors, (63), 26 states have call predecessors, (63), 8 states have call successors, (63) [2022-12-14 10:49:14,464 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 141 transitions. [2022-12-14 10:49:14,465 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 141 transitions. Word has length 152 [2022-12-14 10:49:14,465 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 10:49:14,465 INFO L495 AbstractCegarLoop]: Abstraction has 98 states and 141 transitions. [2022-12-14 10:49:14,465 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 155 states, 150 states have (on average 1.5466666666666666) internal successors, (232), 95 states have internal predecessors, (232), 43 states have call successors, (43), 1 states have call predecessors, (43), 40 states have return successors, (61), 60 states have call predecessors, (61), 43 states have call successors, (61) [2022-12-14 10:49:14,465 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 141 transitions. [2022-12-14 10:49:14,466 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 188 [2022-12-14 10:49:14,466 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 10:49:14,466 INFO L195 NwaCegarLoop]: trace histogram [26, 26, 26, 24, 24, 24, 24, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 10:49:14,472 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Ended with exit code 0 [2022-12-14 10:49:14,666 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable32 [2022-12-14 10:49:14,667 INFO L420 AbstractCegarLoop]: === Iteration 34 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 10:49:14,667 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 10:49:14,667 INFO L85 PathProgramCache]: Analyzing trace with hash -24316134, now seen corresponding path program 31 times [2022-12-14 10:49:14,667 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 10:49:14,667 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [757308560] [2022-12-14 10:49:14,667 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 10:49:14,667 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 10:49:14,694 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 10:49:19,950 INFO L134 CoverageAnalysis]: Checked inductivity of 2177 backedges. 1 proven. 1844 refuted. 0 times theorem prover too weak. 332 trivial. 0 not checked. [2022-12-14 10:49:19,951 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 10:49:19,951 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [757308560] [2022-12-14 10:49:19,951 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [757308560] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 10:49:19,951 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1219544087] [2022-12-14 10:49:19,951 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 10:49:19,951 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 10:49:19,951 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 10:49:19,952 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 10:49:19,952 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Waiting until timeout for monitored process [2022-12-14 10:49:20,182 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 10:49:20,187 WARN L261 TraceCheckSpWp]: Trace formula consists of 539 conjuncts, 313 conjunts are in the unsatisfiable core [2022-12-14 10:49:20,190 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 10:49:24,609 INFO L134 CoverageAnalysis]: Checked inductivity of 2177 backedges. 18 proven. 984 refuted. 0 times theorem prover too weak. 1175 trivial. 0 not checked. [2022-12-14 10:49:24,610 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 10:49:43,213 INFO L134 CoverageAnalysis]: Checked inductivity of 2177 backedges. 89 proven. 1759 refuted. 0 times theorem prover too weak. 329 trivial. 0 not checked. [2022-12-14 10:49:43,213 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1219544087] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 10:49:43,213 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [664357546] [2022-12-14 10:49:43,213 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-12-14 10:49:43,213 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 10:49:43,214 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:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) 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) [2022-12-14 10:49:43,214 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 10:49:43,214 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [83, 46, 82] total 186 [2022-12-14 10:49:43,214 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2079970175] [2022-12-14 10:49:43,214 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 10:49:43,214 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 186 states [2022-12-14 10:49:43,215 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 10:49:43,215 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 186 interpolants. [2022-12-14 10:49:43,216 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=662, Invalid=33746, Unknown=2, NotChecked=0, Total=34410 [2022-12-14 10:49:43,217 INFO L87 Difference]: Start difference. First operand 98 states and 141 transitions. Second operand has 186 states, 180 states have (on average 1.5555555555555556) internal successors, (280), 115 states have internal predecessors, (280), 52 states have call successors, (52), 1 states have call predecessors, (52), 50 states have return successors, (72), 71 states have call predecessors, (72), 52 states have call successors, (72) [2022-12-14 10:49:50,789 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 10:49:50,789 INFO L93 Difference]: Finished difference Result 117 states and 188 transitions. [2022-12-14 10:49:50,789 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2022-12-14 10:49:50,789 INFO L78 Accepts]: Start accepts. Automaton has has 186 states, 180 states have (on average 1.5555555555555556) internal successors, (280), 115 states have internal predecessors, (280), 52 states have call successors, (52), 1 states have call predecessors, (52), 50 states have return successors, (72), 71 states have call predecessors, (72), 52 states have call successors, (72) Word has length 187 [2022-12-14 10:49:50,790 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 10:49:50,791 INFO L225 Difference]: With dead ends: 117 [2022-12-14 10:49:50,791 INFO L226 Difference]: Without dead ends: 111 [2022-12-14 10:49:50,794 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 506 GetRequests, 253 SyntacticMatches, 21 SemanticMatches, 232 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12270 ImplicationChecksByTransitivity, 21.0s TimeCoverageRelationStatistics Valid=3530, Invalid=50990, Unknown=2, NotChecked=0, Total=54522 [2022-12-14 10:49:50,794 INFO L413 NwaCegarLoop]: 30 mSDtfsCounter, 808 mSDsluCounter, 2158 mSDsCounter, 0 mSdLazyCounter, 8643 mSolverCounterSat, 612 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 810 SdHoareTripleChecker+Valid, 2188 SdHoareTripleChecker+Invalid, 9255 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 612 IncrementalHoareTripleChecker+Valid, 8643 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.0s IncrementalHoareTripleChecker+Time [2022-12-14 10:49:50,794 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [810 Valid, 2188 Invalid, 9255 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [612 Valid, 8643 Invalid, 0 Unknown, 0 Unchecked, 4.0s Time] [2022-12-14 10:49:50,795 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 111 states. [2022-12-14 10:49:50,817 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 111 to 101. [2022-12-14 10:49:50,817 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 101 states, 68 states have (on average 1.0588235294117647) internal successors, (72), 69 states have internal predecessors, (72), 8 states have call successors, (8), 4 states have call predecessors, (8), 24 states have return successors, (66), 27 states have call predecessors, (66), 8 states have call successors, (66) [2022-12-14 10:49:50,818 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 146 transitions. [2022-12-14 10:49:50,818 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 146 transitions. Word has length 187 [2022-12-14 10:49:50,818 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 10:49:50,818 INFO L495 AbstractCegarLoop]: Abstraction has 101 states and 146 transitions. [2022-12-14 10:49:50,818 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 186 states, 180 states have (on average 1.5555555555555556) internal successors, (280), 115 states have internal predecessors, (280), 52 states have call successors, (52), 1 states have call predecessors, (52), 50 states have return successors, (72), 71 states have call predecessors, (72), 52 states have call successors, (72) [2022-12-14 10:49:50,819 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 146 transitions. [2022-12-14 10:49:50,819 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 167 [2022-12-14 10:49:50,819 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 10:49:50,819 INFO L195 NwaCegarLoop]: trace histogram [23, 23, 23, 21, 21, 21, 21, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 10:49:50,825 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Ended with exit code 0 [2022-12-14 10:49:51,020 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33,32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 10:49:51,021 INFO L420 AbstractCegarLoop]: === Iteration 35 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 10:49:51,022 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 10:49:51,022 INFO L85 PathProgramCache]: Analyzing trace with hash 1848358090, now seen corresponding path program 32 times [2022-12-14 10:49:51,022 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 10:49:51,023 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [825395] [2022-12-14 10:49:51,023 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 10:49:51,023 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 10:49:51,079 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 10:49:54,725 INFO L134 CoverageAnalysis]: Checked inductivity of 1685 backedges. 0 proven. 1428 refuted. 0 times theorem prover too weak. 257 trivial. 0 not checked. [2022-12-14 10:49:54,725 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 10:49:54,725 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [825395] [2022-12-14 10:49:54,725 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [825395] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 10:49:54,725 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [807479466] [2022-12-14 10:49:54,725 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 10:49:54,725 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 10:49:54,725 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 10:49:54,726 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 10:49:54,726 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Waiting until timeout for monitored process [2022-12-14 10:49:54,993 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 23 check-sat command(s) [2022-12-14 10:49:54,993 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 10:49:55,000 WARN L261 TraceCheckSpWp]: Trace formula consists of 482 conjuncts, 277 conjunts are in the unsatisfiable core [2022-12-14 10:49:55,003 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 10:49:58,890 INFO L134 CoverageAnalysis]: Checked inductivity of 1685 backedges. 19 proven. 773 refuted. 0 times theorem prover too weak. 893 trivial. 0 not checked. [2022-12-14 10:49:58,890 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 10:50:13,551 INFO L134 CoverageAnalysis]: Checked inductivity of 1685 backedges. 68 proven. 1360 refuted. 0 times theorem prover too weak. 257 trivial. 0 not checked. [2022-12-14 10:50:13,551 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [807479466] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 10:50:13,551 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [636184854] [2022-12-14 10:50:13,552 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-12-14 10:50:13,552 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 10:50:13,552 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:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) 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) [2022-12-14 10:50:13,552 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 10:50:13,552 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [75, 48, 72] total 169 [2022-12-14 10:50:13,553 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [629562002] [2022-12-14 10:50:13,553 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 10:50:13,553 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 169 states [2022-12-14 10:50:13,553 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 10:50:13,554 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 169 interpolants. [2022-12-14 10:50:13,555 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=579, Invalid=27813, Unknown=0, NotChecked=0, Total=28392 [2022-12-14 10:50:13,555 INFO L87 Difference]: Start difference. First operand 101 states and 146 transitions. Second operand has 169 states, 164 states have (on average 1.548780487804878) internal successors, (254), 103 states have internal predecessors, (254), 47 states have call successors, (47), 1 states have call predecessors, (47), 44 states have return successors, (67), 66 states have call predecessors, (67), 47 states have call successors, (67) [2022-12-14 10:50:20,193 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 10:50:20,193 INFO L93 Difference]: Finished difference Result 120 states and 176 transitions. [2022-12-14 10:50:20,193 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2022-12-14 10:50:20,193 INFO L78 Accepts]: Start accepts. Automaton has has 169 states, 164 states have (on average 1.548780487804878) internal successors, (254), 103 states have internal predecessors, (254), 47 states have call successors, (47), 1 states have call predecessors, (47), 44 states have return successors, (67), 66 states have call predecessors, (67), 47 states have call successors, (67) Word has length 166 [2022-12-14 10:50:20,193 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 10:50:20,194 INFO L225 Difference]: With dead ends: 120 [2022-12-14 10:50:20,194 INFO L226 Difference]: Without dead ends: 114 [2022-12-14 10:50:20,196 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 457 GetRequests, 218 SyntacticMatches, 22 SemanticMatches, 217 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11180 ImplicationChecksByTransitivity, 15.6s TimeCoverageRelationStatistics Valid=3338, Invalid=44404, Unknown=0, NotChecked=0, Total=47742 [2022-12-14 10:50:20,196 INFO L413 NwaCegarLoop]: 31 mSDtfsCounter, 516 mSDsluCounter, 2026 mSDsCounter, 0 mSdLazyCounter, 7689 mSolverCounterSat, 302 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 519 SdHoareTripleChecker+Valid, 2057 SdHoareTripleChecker+Invalid, 7991 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 302 IncrementalHoareTripleChecker+Valid, 7689 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.5s IncrementalHoareTripleChecker+Time [2022-12-14 10:50:20,196 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [519 Valid, 2057 Invalid, 7991 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [302 Valid, 7689 Invalid, 0 Unknown, 0 Unchecked, 3.5s Time] [2022-12-14 10:50:20,197 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2022-12-14 10:50:20,210 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 104. [2022-12-14 10:50:20,210 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 104 states, 70 states have (on average 1.0571428571428572) internal successors, (74), 71 states have internal predecessors, (74), 8 states have call successors, (8), 4 states have call predecessors, (8), 25 states have return successors, (69), 28 states have call predecessors, (69), 8 states have call successors, (69) [2022-12-14 10:50:20,210 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 104 states to 104 states and 151 transitions. [2022-12-14 10:50:20,210 INFO L78 Accepts]: Start accepts. Automaton has 104 states and 151 transitions. Word has length 166 [2022-12-14 10:50:20,210 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 10:50:20,211 INFO L495 AbstractCegarLoop]: Abstraction has 104 states and 151 transitions. [2022-12-14 10:50:20,211 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 169 states, 164 states have (on average 1.548780487804878) internal successors, (254), 103 states have internal predecessors, (254), 47 states have call successors, (47), 1 states have call predecessors, (47), 44 states have return successors, (67), 66 states have call predecessors, (67), 47 states have call successors, (67) [2022-12-14 10:50:20,211 INFO L276 IsEmpty]: Start isEmpty. Operand 104 states and 151 transitions. [2022-12-14 10:50:20,211 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 174 [2022-12-14 10:50:20,211 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 10:50:20,212 INFO L195 NwaCegarLoop]: trace histogram [24, 24, 24, 22, 22, 22, 22, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 10:50:20,217 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Ended with exit code 0 [2022-12-14 10:50:20,412 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34,33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 10:50:20,413 INFO L420 AbstractCegarLoop]: === Iteration 36 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 10:50:20,414 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 10:50:20,414 INFO L85 PathProgramCache]: Analyzing trace with hash 1006119434, now seen corresponding path program 33 times [2022-12-14 10:50:20,415 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 10:50:20,415 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [817251440] [2022-12-14 10:50:20,415 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 10:50:20,416 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 10:50:20,474 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 10:50:24,750 INFO L134 CoverageAnalysis]: Checked inductivity of 1842 backedges. 0 proven. 1562 refuted. 0 times theorem prover too weak. 280 trivial. 0 not checked. [2022-12-14 10:50:24,751 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 10:50:24,751 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [817251440] [2022-12-14 10:50:24,751 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [817251440] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 10:50:24,751 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1476318984] [2022-12-14 10:50:24,751 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 10:50:24,751 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 10:50:24,751 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 10:50:24,752 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 10:50:24,753 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Waiting until timeout for monitored process [2022-12-14 10:50:25,014 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 10:50:25,014 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 10:50:25,018 WARN L261 TraceCheckSpWp]: Trace formula consists of 501 conjuncts, 289 conjunts are in the unsatisfiable core [2022-12-14 10:50:25,021 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 10:50:29,071 INFO L134 CoverageAnalysis]: Checked inductivity of 1842 backedges. 20 proven. 843 refuted. 0 times theorem prover too weak. 979 trivial. 0 not checked. [2022-12-14 10:50:29,071 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 10:50:43,662 INFO L134 CoverageAnalysis]: Checked inductivity of 1842 backedges. 71 proven. 1491 refuted. 0 times theorem prover too weak. 280 trivial. 0 not checked. [2022-12-14 10:50:43,662 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1476318984] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 10:50:43,662 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1792307186] [2022-12-14 10:50:43,663 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-12-14 10:50:43,663 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 10:50:43,663 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:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) 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) [2022-12-14 10:50:43,663 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 10:50:43,663 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [78, 50, 75] total 176 [2022-12-14 10:50:43,664 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1715322606] [2022-12-14 10:50:43,664 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 10:50:43,664 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 176 states [2022-12-14 10:50:43,664 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 10:50:43,665 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 176 interpolants. [2022-12-14 10:50:43,667 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=603, Invalid=30197, Unknown=0, NotChecked=0, Total=30800 [2022-12-14 10:50:43,667 INFO L87 Difference]: Start difference. First operand 104 states and 151 transitions. Second operand has 176 states, 171 states have (on average 1.5497076023391814) internal successors, (265), 107 states have internal predecessors, (265), 49 states have call successors, (49), 1 states have call predecessors, (49), 46 states have return successors, (70), 69 states have call predecessors, (70), 49 states have call successors, (70) [2022-12-14 10:50:50,428 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 10:50:50,429 INFO L93 Difference]: Finished difference Result 123 states and 181 transitions. [2022-12-14 10:50:50,429 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2022-12-14 10:50:50,429 INFO L78 Accepts]: Start accepts. Automaton has has 176 states, 171 states have (on average 1.5497076023391814) internal successors, (265), 107 states have internal predecessors, (265), 49 states have call successors, (49), 1 states have call predecessors, (49), 46 states have return successors, (70), 69 states have call predecessors, (70), 49 states have call successors, (70) Word has length 173 [2022-12-14 10:50:50,429 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 10:50:50,430 INFO L225 Difference]: With dead ends: 123 [2022-12-14 10:50:50,430 INFO L226 Difference]: Without dead ends: 117 [2022-12-14 10:50:50,433 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 476 GetRequests, 227 SyntacticMatches, 23 SemanticMatches, 226 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12144 ImplicationChecksByTransitivity, 16.5s TimeCoverageRelationStatistics Valid=3579, Invalid=48177, Unknown=0, NotChecked=0, Total=51756 [2022-12-14 10:50:50,433 INFO L413 NwaCegarLoop]: 33 mSDtfsCounter, 1900 mSDsluCounter, 2150 mSDsCounter, 0 mSdLazyCounter, 7806 mSolverCounterSat, 1016 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1902 SdHoareTripleChecker+Valid, 2183 SdHoareTripleChecker+Invalid, 8822 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1016 IncrementalHoareTripleChecker+Valid, 7806 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.5s IncrementalHoareTripleChecker+Time [2022-12-14 10:50:50,433 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1902 Valid, 2183 Invalid, 8822 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1016 Valid, 7806 Invalid, 0 Unknown, 0 Unchecked, 3.5s Time] [2022-12-14 10:50:50,434 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 117 states. [2022-12-14 10:50:50,458 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 117 to 107. [2022-12-14 10:50:50,458 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 107 states, 72 states have (on average 1.0555555555555556) internal successors, (76), 73 states have internal predecessors, (76), 8 states have call successors, (8), 4 states have call predecessors, (8), 26 states have return successors, (72), 29 states have call predecessors, (72), 8 states have call successors, (72) [2022-12-14 10:50:50,458 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 156 transitions. [2022-12-14 10:50:50,459 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 156 transitions. Word has length 173 [2022-12-14 10:50:50,459 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 10:50:50,459 INFO L495 AbstractCegarLoop]: Abstraction has 107 states and 156 transitions. [2022-12-14 10:50:50,459 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 176 states, 171 states have (on average 1.5497076023391814) internal successors, (265), 107 states have internal predecessors, (265), 49 states have call successors, (49), 1 states have call predecessors, (49), 46 states have return successors, (70), 69 states have call predecessors, (70), 49 states have call successors, (70) [2022-12-14 10:50:50,459 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 156 transitions. [2022-12-14 10:50:50,460 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 181 [2022-12-14 10:50:50,460 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 10:50:50,460 INFO L195 NwaCegarLoop]: trace histogram [25, 25, 25, 23, 23, 23, 23, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 10:50:50,465 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Ended with exit code 0 [2022-12-14 10:50:50,660 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable35 [2022-12-14 10:50:50,661 INFO L420 AbstractCegarLoop]: === Iteration 37 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 10:50:50,662 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 10:50:50,662 INFO L85 PathProgramCache]: Analyzing trace with hash 808950010, now seen corresponding path program 34 times [2022-12-14 10:50:50,663 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 10:50:50,663 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [272619460] [2022-12-14 10:50:50,663 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 10:50:50,663 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 10:50:50,724 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 10:50:55,482 INFO L134 CoverageAnalysis]: Checked inductivity of 2006 backedges. 0 proven. 1702 refuted. 0 times theorem prover too weak. 304 trivial. 0 not checked. [2022-12-14 10:50:55,482 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 10:50:55,482 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [272619460] [2022-12-14 10:50:55,482 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [272619460] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 10:50:55,483 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1970511951] [2022-12-14 10:50:55,483 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 10:50:55,483 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 10:50:55,483 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 10:50:55,483 INFO L229 MonitoredProcess]: Starting monitored process 35 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 10:50:55,484 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Waiting until timeout for monitored process [2022-12-14 10:50:55,790 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 10:50:55,795 WARN L261 TraceCheckSpWp]: Trace formula consists of 520 conjuncts, 301 conjunts are in the unsatisfiable core [2022-12-14 10:50:55,798 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 10:51:00,634 INFO L134 CoverageAnalysis]: Checked inductivity of 2006 backedges. 21 proven. 916 refuted. 0 times theorem prover too weak. 1069 trivial. 0 not checked. [2022-12-14 10:51:00,635 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 10:51:16,011 INFO L134 CoverageAnalysis]: Checked inductivity of 2006 backedges. 74 proven. 1628 refuted. 0 times theorem prover too weak. 304 trivial. 0 not checked. [2022-12-14 10:51:16,011 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1970511951] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 10:51:16,011 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1622977876] [2022-12-14 10:51:16,012 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-12-14 10:51:16,012 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 10:51:16,012 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:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) 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) [2022-12-14 10:51:16,012 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 10:51:16,012 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [81, 52, 78] total 183 [2022-12-14 10:51:16,013 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1470003114] [2022-12-14 10:51:16,013 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 10:51:16,013 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 183 states [2022-12-14 10:51:16,013 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 10:51:16,014 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 183 interpolants. [2022-12-14 10:51:16,015 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=627, Invalid=32679, Unknown=0, NotChecked=0, Total=33306 [2022-12-14 10:51:16,015 INFO L87 Difference]: Start difference. First operand 107 states and 156 transitions. Second operand has 183 states, 178 states have (on average 1.550561797752809) internal successors, (276), 111 states have internal predecessors, (276), 51 states have call successors, (51), 1 states have call predecessors, (51), 48 states have return successors, (73), 72 states have call predecessors, (73), 51 states have call successors, (73) [2022-12-14 10:51:23,733 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 10:51:23,733 INFO L93 Difference]: Finished difference Result 126 states and 186 transitions. [2022-12-14 10:51:23,734 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2022-12-14 10:51:23,734 INFO L78 Accepts]: Start accepts. Automaton has has 183 states, 178 states have (on average 1.550561797752809) internal successors, (276), 111 states have internal predecessors, (276), 51 states have call successors, (51), 1 states have call predecessors, (51), 48 states have return successors, (73), 72 states have call predecessors, (73), 51 states have call successors, (73) Word has length 180 [2022-12-14 10:51:23,734 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 10:51:23,735 INFO L225 Difference]: With dead ends: 126 [2022-12-14 10:51:23,735 INFO L226 Difference]: Without dead ends: 120 [2022-12-14 10:51:23,737 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 495 GetRequests, 236 SyntacticMatches, 24 SemanticMatches, 235 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13147 ImplicationChecksByTransitivity, 18.0s TimeCoverageRelationStatistics Valid=3828, Invalid=52104, Unknown=0, NotChecked=0, Total=55932 [2022-12-14 10:51:23,737 INFO L413 NwaCegarLoop]: 34 mSDtfsCounter, 1067 mSDsluCounter, 2536 mSDsCounter, 0 mSdLazyCounter, 9190 mSolverCounterSat, 579 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1069 SdHoareTripleChecker+Valid, 2570 SdHoareTripleChecker+Invalid, 9769 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 579 IncrementalHoareTripleChecker+Valid, 9190 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.2s IncrementalHoareTripleChecker+Time [2022-12-14 10:51:23,738 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1069 Valid, 2570 Invalid, 9769 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [579 Valid, 9190 Invalid, 0 Unknown, 0 Unchecked, 4.2s Time] [2022-12-14 10:51:23,738 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 120 states. [2022-12-14 10:51:23,751 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 120 to 110. [2022-12-14 10:51:23,752 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 110 states, 74 states have (on average 1.054054054054054) internal successors, (78), 75 states have internal predecessors, (78), 8 states have call successors, (8), 4 states have call predecessors, (8), 27 states have return successors, (75), 30 states have call predecessors, (75), 8 states have call successors, (75) [2022-12-14 10:51:23,752 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 110 states to 110 states and 161 transitions. [2022-12-14 10:51:23,752 INFO L78 Accepts]: Start accepts. Automaton has 110 states and 161 transitions. Word has length 180 [2022-12-14 10:51:23,752 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 10:51:23,753 INFO L495 AbstractCegarLoop]: Abstraction has 110 states and 161 transitions. [2022-12-14 10:51:23,753 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 183 states, 178 states have (on average 1.550561797752809) internal successors, (276), 111 states have internal predecessors, (276), 51 states have call successors, (51), 1 states have call predecessors, (51), 48 states have return successors, (73), 72 states have call predecessors, (73), 51 states have call successors, (73) [2022-12-14 10:51:23,753 INFO L276 IsEmpty]: Start isEmpty. Operand 110 states and 161 transitions. [2022-12-14 10:51:23,754 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 223 [2022-12-14 10:51:23,754 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 10:51:23,754 INFO L195 NwaCegarLoop]: trace histogram [31, 31, 31, 29, 29, 29, 29, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 10:51:23,760 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Ended with exit code 0 [2022-12-14 10:51:23,954 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable36 [2022-12-14 10:51:23,954 INFO L420 AbstractCegarLoop]: === Iteration 38 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 10:51:23,955 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 10:51:23,955 INFO L85 PathProgramCache]: Analyzing trace with hash -581304616, now seen corresponding path program 35 times [2022-12-14 10:51:23,955 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 10:51:23,955 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1372817796] [2022-12-14 10:51:23,955 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 10:51:23,955 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 10:51:24,005 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 10:51:31,036 INFO L134 CoverageAnalysis]: Checked inductivity of 3137 backedges. 0 proven. 2668 refuted. 0 times theorem prover too weak. 469 trivial. 0 not checked. [2022-12-14 10:51:31,036 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 10:51:31,036 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1372817796] [2022-12-14 10:51:31,036 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1372817796] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 10:51:31,036 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1378536249] [2022-12-14 10:51:31,036 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 10:51:31,036 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 10:51:31,036 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 10:51:31,037 INFO L229 MonitoredProcess]: Starting monitored process 36 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 10:51:31,038 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Waiting until timeout for monitored process [2022-12-14 10:51:31,442 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 38 check-sat command(s) [2022-12-14 10:51:31,442 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 10:51:31,452 WARN L261 TraceCheckSpWp]: Trace formula consists of 634 conjuncts, 372 conjunts are in the unsatisfiable core [2022-12-14 10:51:31,456 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 10:51:37,722 INFO L134 CoverageAnalysis]: Checked inductivity of 3137 backedges. 60 proven. 1429 refuted. 0 times theorem prover too weak. 1648 trivial. 0 not checked. [2022-12-14 10:51:37,722 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 10:52:00,233 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1378536249] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 10:52:00,233 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1805654847] [2022-12-14 10:52:00,234 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-12-14 10:52:00,234 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 10:52:00,234 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:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) 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) [2022-12-14 10:52:00,234 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-12-14 10:52:00,234 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [99, 58] total 153 [2022-12-14 10:52:00,234 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [146952589] [2022-12-14 10:52:00,234 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-12-14 10:52:00,235 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 153 states [2022-12-14 10:52:00,235 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 10:52:00,235 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 153 interpolants. [2022-12-14 10:52:00,237 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=856, Invalid=43034, Unknown=0, NotChecked=0, Total=43890 [2022-12-14 10:52:00,237 INFO L87 Difference]: Start difference. First operand 110 states and 161 transitions. Second operand has 153 states, 148 states have (on average 1.4324324324324325) internal successors, (212), 98 states have internal predecessors, (212), 34 states have call successors, (34), 1 states have call predecessors, (34), 53 states have return successors, (56), 55 states have call predecessors, (56), 34 states have call successors, (56) [2022-12-14 10:52:06,229 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 10:52:06,229 INFO L93 Difference]: Finished difference Result 123 states and 181 transitions. [2022-12-14 10:52:06,229 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2022-12-14 10:52:06,229 INFO L78 Accepts]: Start accepts. Automaton has has 153 states, 148 states have (on average 1.4324324324324325) internal successors, (212), 98 states have internal predecessors, (212), 34 states have call successors, (34), 1 states have call predecessors, (34), 53 states have return successors, (56), 55 states have call predecessors, (56), 34 states have call successors, (56) Word has length 222 [2022-12-14 10:52:06,230 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 10:52:06,230 INFO L225 Difference]: With dead ends: 123 [2022-12-14 10:52:06,230 INFO L226 Difference]: Without dead ends: 119 [2022-12-14 10:52:06,233 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 546 GetRequests, 266 SyntacticMatches, 25 SemanticMatches, 255 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14024 ImplicationChecksByTransitivity, 24.3s TimeCoverageRelationStatistics Valid=4102, Invalid=61690, Unknown=0, NotChecked=0, Total=65792 [2022-12-14 10:52:06,234 INFO L413 NwaCegarLoop]: 34 mSDtfsCounter, 722 mSDsluCounter, 2617 mSDsCounter, 0 mSdLazyCounter, 7945 mSolverCounterSat, 336 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 748 SdHoareTripleChecker+Valid, 2651 SdHoareTripleChecker+Invalid, 8281 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 336 IncrementalHoareTripleChecker+Valid, 7945 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.3s IncrementalHoareTripleChecker+Time [2022-12-14 10:52:06,234 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [748 Valid, 2651 Invalid, 8281 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [336 Valid, 7945 Invalid, 0 Unknown, 0 Unchecked, 3.3s Time] [2022-12-14 10:52:06,234 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 119 states. [2022-12-14 10:52:06,249 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 119 to 115. [2022-12-14 10:52:06,250 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 115 states, 77 states have (on average 1.051948051948052) internal successors, (81), 78 states have internal predecessors, (81), 9 states have call successors, (9), 4 states have call predecessors, (9), 28 states have return successors, (84), 32 states have call predecessors, (84), 9 states have call successors, (84) [2022-12-14 10:52:06,250 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 174 transitions. [2022-12-14 10:52:06,250 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 174 transitions. Word has length 222 [2022-12-14 10:52:06,250 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 10:52:06,250 INFO L495 AbstractCegarLoop]: Abstraction has 115 states and 174 transitions. [2022-12-14 10:52:06,251 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 153 states, 148 states have (on average 1.4324324324324325) internal successors, (212), 98 states have internal predecessors, (212), 34 states have call successors, (34), 1 states have call predecessors, (34), 53 states have return successors, (56), 55 states have call predecessors, (56), 34 states have call successors, (56) [2022-12-14 10:52:06,251 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 174 transitions. [2022-12-14 10:52:06,251 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 188 [2022-12-14 10:52:06,251 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 10:52:06,252 INFO L195 NwaCegarLoop]: trace histogram [26, 26, 26, 24, 24, 24, 24, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 10:52:06,258 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Ended with exit code 0 [2022-12-14 10:52:06,452 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37,36 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 10:52:06,453 INFO L420 AbstractCegarLoop]: === Iteration 39 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 10:52:06,454 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 10:52:06,454 INFO L85 PathProgramCache]: Analyzing trace with hash -1885437478, now seen corresponding path program 36 times [2022-12-14 10:52:06,454 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 10:52:06,455 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [132884070] [2022-12-14 10:52:06,455 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 10:52:06,455 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 10:52:06,528 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 10:52:11,246 INFO L134 CoverageAnalysis]: Checked inductivity of 2177 backedges. 0 proven. 1848 refuted. 0 times theorem prover too weak. 329 trivial. 0 not checked. [2022-12-14 10:52:11,246 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 10:52:11,246 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [132884070] [2022-12-14 10:52:11,246 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [132884070] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 10:52:11,246 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1719022411] [2022-12-14 10:52:11,246 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 10:52:11,246 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 10:52:11,246 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 10:52:11,247 INFO L229 MonitoredProcess]: Starting monitored process 37 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 10:52:11,248 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Waiting until timeout for monitored process [2022-12-14 10:52:11,579 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 10:52:11,579 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 10:52:11,584 WARN L261 TraceCheckSpWp]: Trace formula consists of 539 conjuncts, 313 conjunts are in the unsatisfiable core [2022-12-14 10:52:11,587 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 10:52:16,269 INFO L134 CoverageAnalysis]: Checked inductivity of 2177 backedges. 22 proven. 992 refuted. 0 times theorem prover too weak. 1163 trivial. 0 not checked. [2022-12-14 10:52:16,269 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 10:52:33,037 INFO L134 CoverageAnalysis]: Checked inductivity of 2177 backedges. 77 proven. 1771 refuted. 0 times theorem prover too weak. 329 trivial. 0 not checked. [2022-12-14 10:52:33,037 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1719022411] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 10:52:33,037 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2010417170] [2022-12-14 10:52:33,037 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-12-14 10:52:33,038 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 10:52:33,038 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:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) 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) [2022-12-14 10:52:33,038 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 10:52:33,038 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [84, 54, 81] total 190 [2022-12-14 10:52:33,038 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1286206201] [2022-12-14 10:52:33,038 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 10:52:33,038 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 190 states [2022-12-14 10:52:33,039 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 10:52:33,039 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 190 interpolants. [2022-12-14 10:52:33,041 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=651, Invalid=35259, Unknown=0, NotChecked=0, Total=35910 [2022-12-14 10:52:33,041 INFO L87 Difference]: Start difference. First operand 115 states and 174 transitions. Second operand has 190 states, 185 states have (on average 1.5513513513513513) internal successors, (287), 115 states have internal predecessors, (287), 53 states have call successors, (53), 1 states have call predecessors, (53), 50 states have return successors, (76), 75 states have call predecessors, (76), 53 states have call successors, (76) [2022-12-14 10:52:41,881 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 10:52:41,881 INFO L93 Difference]: Finished difference Result 131 states and 194 transitions. [2022-12-14 10:52:41,881 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 63 states. [2022-12-14 10:52:41,881 INFO L78 Accepts]: Start accepts. Automaton has has 190 states, 185 states have (on average 1.5513513513513513) internal successors, (287), 115 states have internal predecessors, (287), 53 states have call successors, (53), 1 states have call predecessors, (53), 50 states have return successors, (76), 75 states have call predecessors, (76), 53 states have call successors, (76) Word has length 187 [2022-12-14 10:52:41,881 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 10:52:41,882 INFO L225 Difference]: With dead ends: 131 [2022-12-14 10:52:41,882 INFO L226 Difference]: Without dead ends: 125 [2022-12-14 10:52:41,885 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 514 GetRequests, 245 SyntacticMatches, 25 SemanticMatches, 244 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14192 ImplicationChecksByTransitivity, 19.0s TimeCoverageRelationStatistics Valid=4085, Invalid=56185, Unknown=0, NotChecked=0, Total=60270 [2022-12-14 10:52:41,885 INFO L413 NwaCegarLoop]: 35 mSDtfsCounter, 2220 mSDsluCounter, 2557 mSDsCounter, 0 mSdLazyCounter, 9559 mSolverCounterSat, 1180 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2222 SdHoareTripleChecker+Valid, 2592 SdHoareTripleChecker+Invalid, 10739 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1180 IncrementalHoareTripleChecker+Valid, 9559 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.8s IncrementalHoareTripleChecker+Time [2022-12-14 10:52:41,885 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2222 Valid, 2592 Invalid, 10739 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1180 Valid, 9559 Invalid, 0 Unknown, 0 Unchecked, 4.8s Time] [2022-12-14 10:52:41,885 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 125 states. [2022-12-14 10:52:41,899 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 125 to 113. [2022-12-14 10:52:41,900 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 113 states, 76 states have (on average 1.0526315789473684) internal successors, (80), 77 states have internal predecessors, (80), 8 states have call successors, (8), 4 states have call predecessors, (8), 28 states have return successors, (78), 31 states have call predecessors, (78), 8 states have call successors, (78) [2022-12-14 10:52:41,900 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 113 states to 113 states and 166 transitions. [2022-12-14 10:52:41,900 INFO L78 Accepts]: Start accepts. Automaton has 113 states and 166 transitions. Word has length 187 [2022-12-14 10:52:41,900 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 10:52:41,900 INFO L495 AbstractCegarLoop]: Abstraction has 113 states and 166 transitions. [2022-12-14 10:52:41,901 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 190 states, 185 states have (on average 1.5513513513513513) internal successors, (287), 115 states have internal predecessors, (287), 53 states have call successors, (53), 1 states have call predecessors, (53), 50 states have return successors, (76), 75 states have call predecessors, (76), 53 states have call successors, (76) [2022-12-14 10:52:41,901 INFO L276 IsEmpty]: Start isEmpty. Operand 113 states and 166 transitions. [2022-12-14 10:52:41,901 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 195 [2022-12-14 10:52:41,901 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 10:52:41,901 INFO L195 NwaCegarLoop]: trace histogram [27, 27, 27, 25, 25, 25, 25, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 10:52:41,908 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Ended with exit code 0 [2022-12-14 10:52:42,102 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable38 [2022-12-14 10:52:42,103 INFO L420 AbstractCegarLoop]: === Iteration 40 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 10:52:42,104 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 10:52:42,104 INFO L85 PathProgramCache]: Analyzing trace with hash 1663714602, now seen corresponding path program 37 times [2022-12-14 10:52:42,104 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 10:52:42,105 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1688027472] [2022-12-14 10:52:42,105 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 10:52:42,105 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 10:52:42,183 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 10:52:47,275 INFO L134 CoverageAnalysis]: Checked inductivity of 2355 backedges. 0 proven. 2000 refuted. 0 times theorem prover too weak. 355 trivial. 0 not checked. [2022-12-14 10:52:47,275 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 10:52:47,276 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1688027472] [2022-12-14 10:52:47,276 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1688027472] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 10:52:47,276 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [286549340] [2022-12-14 10:52:47,276 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 10:52:47,276 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 10:52:47,276 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 10:52:47,277 INFO L229 MonitoredProcess]: Starting monitored process 38 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 10:52:47,277 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Waiting until timeout for monitored process [2022-12-14 10:52:47,703 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 10:52:47,710 WARN L261 TraceCheckSpWp]: Trace formula consists of 558 conjuncts, 325 conjunts are in the unsatisfiable core [2022-12-14 10:52:47,713 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 10:52:53,108 INFO L134 CoverageAnalysis]: Checked inductivity of 2355 backedges. 23 proven. 1071 refuted. 0 times theorem prover too weak. 1261 trivial. 0 not checked. [2022-12-14 10:52:53,108 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 10:53:12,967 INFO L134 CoverageAnalysis]: Checked inductivity of 2355 backedges. 80 proven. 1920 refuted. 0 times theorem prover too weak. 355 trivial. 0 not checked. [2022-12-14 10:53:12,968 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [286549340] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 10:53:12,968 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [759245007] [2022-12-14 10:53:12,969 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-12-14 10:53:12,969 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 10:53:12,969 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:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) 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) [2022-12-14 10:53:12,969 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 10:53:12,969 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [87, 56, 84] total 197 [2022-12-14 10:53:12,969 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [736255970] [2022-12-14 10:53:12,970 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 10:53:12,970 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 197 states [2022-12-14 10:53:12,970 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 10:53:12,972 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 197 interpolants. [2022-12-14 10:53:12,973 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=675, Invalid=37937, Unknown=0, NotChecked=0, Total=38612 [2022-12-14 10:53:12,973 INFO L87 Difference]: Start difference. First operand 113 states and 166 transitions. Second operand has 197 states, 192 states have (on average 1.5520833333333333) internal successors, (298), 119 states have internal predecessors, (298), 55 states have call successors, (55), 1 states have call predecessors, (55), 52 states have return successors, (79), 78 states have call predecessors, (79), 55 states have call successors, (79) [2022-12-14 10:53:21,420 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 10:53:21,420 INFO L93 Difference]: Finished difference Result 132 states and 196 transitions. [2022-12-14 10:53:21,420 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 65 states. [2022-12-14 10:53:21,421 INFO L78 Accepts]: Start accepts. Automaton has has 197 states, 192 states have (on average 1.5520833333333333) internal successors, (298), 119 states have internal predecessors, (298), 55 states have call successors, (55), 1 states have call predecessors, (55), 52 states have return successors, (79), 78 states have call predecessors, (79), 55 states have call successors, (79) Word has length 194 [2022-12-14 10:53:21,421 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 10:53:21,422 INFO L225 Difference]: With dead ends: 132 [2022-12-14 10:53:21,422 INFO L226 Difference]: Without dead ends: 126 [2022-12-14 10:53:21,426 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 533 GetRequests, 254 SyntacticMatches, 26 SemanticMatches, 253 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15275 ImplicationChecksByTransitivity, 21.4s TimeCoverageRelationStatistics Valid=4350, Invalid=60420, Unknown=0, NotChecked=0, Total=64770 [2022-12-14 10:53:21,426 INFO L413 NwaCegarLoop]: 35 mSDtfsCounter, 861 mSDsluCounter, 2458 mSDsCounter, 0 mSdLazyCounter, 9050 mSolverCounterSat, 489 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 863 SdHoareTripleChecker+Valid, 2493 SdHoareTripleChecker+Invalid, 9539 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 489 IncrementalHoareTripleChecker+Valid, 9050 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.4s IncrementalHoareTripleChecker+Time [2022-12-14 10:53:21,427 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [863 Valid, 2493 Invalid, 9539 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [489 Valid, 9050 Invalid, 0 Unknown, 0 Unchecked, 4.4s Time] [2022-12-14 10:53:21,427 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 126 states. [2022-12-14 10:53:21,447 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 126 to 116. [2022-12-14 10:53:21,447 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 116 states, 78 states have (on average 1.0512820512820513) internal successors, (82), 79 states have internal predecessors, (82), 8 states have call successors, (8), 4 states have call predecessors, (8), 29 states have return successors, (81), 32 states have call predecessors, (81), 8 states have call successors, (81) [2022-12-14 10:53:21,447 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 116 states to 116 states and 171 transitions. [2022-12-14 10:53:21,447 INFO L78 Accepts]: Start accepts. Automaton has 116 states and 171 transitions. Word has length 194 [2022-12-14 10:53:21,448 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 10:53:21,448 INFO L495 AbstractCegarLoop]: Abstraction has 116 states and 171 transitions. [2022-12-14 10:53:21,448 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 197 states, 192 states have (on average 1.5520833333333333) internal successors, (298), 119 states have internal predecessors, (298), 55 states have call successors, (55), 1 states have call predecessors, (55), 52 states have return successors, (79), 78 states have call predecessors, (79), 55 states have call successors, (79) [2022-12-14 10:53:21,448 INFO L276 IsEmpty]: Start isEmpty. Operand 116 states and 171 transitions. [2022-12-14 10:53:21,449 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 237 [2022-12-14 10:53:21,449 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 10:53:21,449 INFO L195 NwaCegarLoop]: trace histogram [33, 33, 33, 31, 31, 31, 31, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 10:53:21,456 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Ended with exit code 0 [2022-12-14 10:53:21,649 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable39 [2022-12-14 10:53:21,650 INFO L420 AbstractCegarLoop]: === Iteration 41 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 10:53:21,651 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 10:53:21,651 INFO L85 PathProgramCache]: Analyzing trace with hash -1781695960, now seen corresponding path program 38 times [2022-12-14 10:53:21,652 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 10:53:21,652 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [877149341] [2022-12-14 10:53:21,652 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 10:53:21,652 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 10:53:21,729 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 10:53:30,365 INFO L134 CoverageAnalysis]: Checked inductivity of 3570 backedges. 0 proven. 3038 refuted. 0 times theorem prover too weak. 532 trivial. 0 not checked. [2022-12-14 10:53:30,365 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 10:53:30,365 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [877149341] [2022-12-14 10:53:30,365 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [877149341] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 10:53:30,365 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1782156050] [2022-12-14 10:53:30,365 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 10:53:30,365 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 10:53:30,366 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 10:53:30,366 INFO L229 MonitoredProcess]: Starting monitored process 39 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 10:53:30,367 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Waiting until timeout for monitored process [2022-12-14 10:53:30,966 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 39 check-sat command(s) [2022-12-14 10:53:30,967 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 10:53:30,981 WARN L261 TraceCheckSpWp]: Trace formula consists of 672 conjuncts, 396 conjunts are in the unsatisfiable core [2022-12-14 10:53:30,985 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 10:53:38,346 INFO L134 CoverageAnalysis]: Checked inductivity of 3570 backedges. 64 proven. 1622 refuted. 0 times theorem prover too weak. 1884 trivial. 0 not checked. [2022-12-14 10:53:38,346 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 10:54:04,752 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1782156050] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 10:54:04,752 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [637290492] [2022-12-14 10:54:04,753 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-12-14 10:54:04,753 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 10:54:04,753 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:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) 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) [2022-12-14 10:54:04,753 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-12-14 10:54:04,754 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [105, 62] total 163 [2022-12-14 10:54:04,754 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [53000386] [2022-12-14 10:54:04,754 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-12-14 10:54:04,754 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 163 states [2022-12-14 10:54:04,754 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 10:54:04,755 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 163 interpolants. [2022-12-14 10:54:04,757 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=912, Invalid=49040, Unknown=0, NotChecked=0, Total=49952 [2022-12-14 10:54:04,757 INFO L87 Difference]: Start difference. First operand 116 states and 171 transitions. Second operand has 163 states, 158 states have (on average 1.4303797468354431) internal successors, (226), 104 states have internal predecessors, (226), 36 states have call successors, (36), 1 states have call predecessors, (36), 57 states have return successors, (60), 59 states have call predecessors, (60), 36 states have call successors, (60) [2022-12-14 10:54:11,714 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 10:54:11,714 INFO L93 Difference]: Finished difference Result 129 states and 191 transitions. [2022-12-14 10:54:11,714 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2022-12-14 10:54:11,714 INFO L78 Accepts]: Start accepts. Automaton has has 163 states, 158 states have (on average 1.4303797468354431) internal successors, (226), 104 states have internal predecessors, (226), 36 states have call successors, (36), 1 states have call predecessors, (36), 57 states have return successors, (60), 59 states have call predecessors, (60), 36 states have call successors, (60) Word has length 236 [2022-12-14 10:54:11,715 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 10:54:11,715 INFO L225 Difference]: With dead ends: 129 [2022-12-14 10:54:11,715 INFO L226 Difference]: Without dead ends: 125 [2022-12-14 10:54:11,718 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 584 GetRequests, 284 SyntacticMatches, 27 SemanticMatches, 273 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16214 ImplicationChecksByTransitivity, 28.6s TimeCoverageRelationStatistics Valid=4640, Invalid=70710, Unknown=0, NotChecked=0, Total=75350 [2022-12-14 10:54:11,718 INFO L413 NwaCegarLoop]: 37 mSDtfsCounter, 536 mSDsluCounter, 3174 mSDsCounter, 0 mSdLazyCounter, 9321 mSolverCounterSat, 236 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 564 SdHoareTripleChecker+Valid, 3211 SdHoareTripleChecker+Invalid, 9557 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 236 IncrementalHoareTripleChecker+Valid, 9321 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.0s IncrementalHoareTripleChecker+Time [2022-12-14 10:54:11,718 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [564 Valid, 3211 Invalid, 9557 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [236 Valid, 9321 Invalid, 0 Unknown, 0 Unchecked, 4.0s Time] [2022-12-14 10:54:11,719 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 125 states. [2022-12-14 10:54:11,735 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 125 to 121. [2022-12-14 10:54:11,735 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 121 states, 81 states have (on average 1.0493827160493827) internal successors, (85), 82 states have internal predecessors, (85), 9 states have call successors, (9), 4 states have call predecessors, (9), 30 states have return successors, (90), 34 states have call predecessors, (90), 9 states have call successors, (90) [2022-12-14 10:54:11,735 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 121 states to 121 states and 184 transitions. [2022-12-14 10:54:11,735 INFO L78 Accepts]: Start accepts. Automaton has 121 states and 184 transitions. Word has length 236 [2022-12-14 10:54:11,736 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 10:54:11,736 INFO L495 AbstractCegarLoop]: Abstraction has 121 states and 184 transitions. [2022-12-14 10:54:11,736 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 163 states, 158 states have (on average 1.4303797468354431) internal successors, (226), 104 states have internal predecessors, (226), 36 states have call successors, (36), 1 states have call predecessors, (36), 57 states have return successors, (60), 59 states have call predecessors, (60), 36 states have call successors, (60) [2022-12-14 10:54:11,736 INFO L276 IsEmpty]: Start isEmpty. Operand 121 states and 184 transitions. [2022-12-14 10:54:11,737 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 251 [2022-12-14 10:54:11,737 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 10:54:11,737 INFO L195 NwaCegarLoop]: trace histogram [35, 35, 35, 33, 33, 33, 33, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 10:54:11,744 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Ended with exit code 0 [2022-12-14 10:54:11,937 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40,39 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 10:54:11,939 INFO L420 AbstractCegarLoop]: === Iteration 42 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 10:54:11,939 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 10:54:11,940 INFO L85 PathProgramCache]: Analyzing trace with hash -1202241608, now seen corresponding path program 39 times [2022-12-14 10:54:11,940 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 10:54:11,941 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [597261403] [2022-12-14 10:54:11,941 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 10:54:11,942 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 10:54:12,019 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 10:54:21,373 INFO L134 CoverageAnalysis]: Checked inductivity of 4031 backedges. 0 proven. 3429 refuted. 0 times theorem prover too weak. 602 trivial. 0 not checked. [2022-12-14 10:54:21,374 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 10:54:21,374 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [597261403] [2022-12-14 10:54:21,374 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [597261403] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 10:54:21,374 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [771800175] [2022-12-14 10:54:21,374 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 10:54:21,374 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 10:54:21,374 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 10:54:21,375 INFO L229 MonitoredProcess]: Starting monitored process 40 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 10:54:21,376 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Waiting until timeout for monitored process [2022-12-14 10:54:21,862 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 10:54:21,863 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 10:54:21,869 WARN L261 TraceCheckSpWp]: Trace formula consists of 710 conjuncts, 421 conjunts are in the unsatisfiable core [2022-12-14 10:54:21,876 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 10:54:29,344 INFO L134 CoverageAnalysis]: Checked inductivity of 4031 backedges. 24 proven. 1797 refuted. 0 times theorem prover too weak. 2210 trivial. 0 not checked. [2022-12-14 10:54:29,344 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 10:54:55,178 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [771800175] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 10:54:55,179 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [485166987] [2022-12-14 10:54:55,179 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-12-14 10:54:55,179 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 10:54:55,179 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:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) 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) [2022-12-14 10:54:55,180 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-12-14 10:54:55,180 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [110, 58] total 166 [2022-12-14 10:54:55,180 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [866673212] [2022-12-14 10:54:55,180 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-12-14 10:54:55,180 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 166 states [2022-12-14 10:54:55,180 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 10:54:55,181 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 166 interpolants. [2022-12-14 10:54:55,183 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=794, Invalid=50508, Unknown=0, NotChecked=0, Total=51302 [2022-12-14 10:54:55,183 INFO L87 Difference]: Start difference. First operand 121 states and 184 transitions. Second operand has 166 states, 162 states have (on average 1.4259259259259258) internal successors, (231), 105 states have internal predecessors, (231), 36 states have call successors, (36), 1 states have call predecessors, (36), 59 states have return successors, (61), 61 states have call predecessors, (61), 36 states have call successors, (61) [2022-12-14 10:55:04,065 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 10:55:04,065 INFO L93 Difference]: Finished difference Result 131 states and 194 transitions. [2022-12-14 10:55:04,065 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2022-12-14 10:55:04,065 INFO L78 Accepts]: Start accepts. Automaton has has 166 states, 162 states have (on average 1.4259259259259258) internal successors, (231), 105 states have internal predecessors, (231), 36 states have call successors, (36), 1 states have call predecessors, (36), 59 states have return successors, (61), 61 states have call predecessors, (61), 36 states have call successors, (61) Word has length 250 [2022-12-14 10:55:04,065 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 10:55:04,066 INFO L225 Difference]: With dead ends: 131 [2022-12-14 10:55:04,066 INFO L226 Difference]: Without dead ends: 127 [2022-12-14 10:55:04,069 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 606 GetRequests, 302 SyntacticMatches, 26 SemanticMatches, 278 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15938 ImplicationChecksByTransitivity, 30.5s TimeCoverageRelationStatistics Valid=4716, Invalid=73404, Unknown=0, NotChecked=0, Total=78120 [2022-12-14 10:55:04,069 INFO L413 NwaCegarLoop]: 36 mSDtfsCounter, 1307 mSDsluCounter, 3143 mSDsCounter, 0 mSdLazyCounter, 9574 mSolverCounterSat, 652 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1309 SdHoareTripleChecker+Valid, 3179 SdHoareTripleChecker+Invalid, 10226 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 652 IncrementalHoareTripleChecker+Valid, 9574 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.4s IncrementalHoareTripleChecker+Time [2022-12-14 10:55:04,069 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1309 Valid, 3179 Invalid, 10226 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [652 Valid, 9574 Invalid, 0 Unknown, 0 Unchecked, 4.4s Time] [2022-12-14 10:55:04,070 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 127 states. [2022-12-14 10:55:04,086 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 127 to 121. [2022-12-14 10:55:04,086 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 121 states, 81 states have (on average 1.0493827160493827) internal successors, (85), 82 states have internal predecessors, (85), 9 states have call successors, (9), 4 states have call predecessors, (9), 30 states have return successors, (90), 34 states have call predecessors, (90), 9 states have call successors, (90) [2022-12-14 10:55:04,087 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 121 states to 121 states and 184 transitions. [2022-12-14 10:55:04,087 INFO L78 Accepts]: Start accepts. Automaton has 121 states and 184 transitions. Word has length 250 [2022-12-14 10:55:04,087 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 10:55:04,087 INFO L495 AbstractCegarLoop]: Abstraction has 121 states and 184 transitions. [2022-12-14 10:55:04,088 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 166 states, 162 states have (on average 1.4259259259259258) internal successors, (231), 105 states have internal predecessors, (231), 36 states have call successors, (36), 1 states have call predecessors, (36), 59 states have return successors, (61), 61 states have call predecessors, (61), 36 states have call successors, (61) [2022-12-14 10:55:04,088 INFO L276 IsEmpty]: Start isEmpty. Operand 121 states and 184 transitions. [2022-12-14 10:55:04,088 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 202 [2022-12-14 10:55:04,088 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 10:55:04,089 INFO L195 NwaCegarLoop]: trace histogram [28, 28, 28, 26, 26, 26, 26, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 10:55:04,095 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Ended with exit code 0 [2022-12-14 10:55:04,289 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 40 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable41 [2022-12-14 10:55:04,290 INFO L420 AbstractCegarLoop]: === Iteration 43 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 10:55:04,291 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 10:55:04,291 INFO L85 PathProgramCache]: Analyzing trace with hash -64515670, now seen corresponding path program 40 times [2022-12-14 10:55:04,292 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 10:55:04,292 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1355549139] [2022-12-14 10:55:04,292 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 10:55:04,293 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 10:55:04,359 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 10:55:10,753 INFO L134 CoverageAnalysis]: Checked inductivity of 2540 backedges. 0 proven. 2158 refuted. 0 times theorem prover too weak. 382 trivial. 0 not checked. [2022-12-14 10:55:10,753 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 10:55:10,753 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1355549139] [2022-12-14 10:55:10,753 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1355549139] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 10:55:10,753 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [128785846] [2022-12-14 10:55:10,753 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 10:55:10,753 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 10:55:10,753 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 10:55:10,754 INFO L229 MonitoredProcess]: Starting monitored process 41 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 10:55:10,755 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Waiting until timeout for monitored process [2022-12-14 10:55:11,311 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 10:55:11,317 WARN L261 TraceCheckSpWp]: Trace formula consists of 577 conjuncts, 337 conjunts are in the unsatisfiable core [2022-12-14 10:55:11,320 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 10:55:17,531 INFO L134 CoverageAnalysis]: Checked inductivity of 2540 backedges. 24 proven. 1153 refuted. 0 times theorem prover too weak. 1363 trivial. 0 not checked. [2022-12-14 10:55:17,531 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 10:55:37,446 INFO L134 CoverageAnalysis]: Checked inductivity of 2540 backedges. 83 proven. 2075 refuted. 0 times theorem prover too weak. 382 trivial. 0 not checked. [2022-12-14 10:55:37,446 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [128785846] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 10:55:37,446 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2106436204] [2022-12-14 10:55:37,447 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-12-14 10:55:37,447 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 10:55:37,447 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:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) 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) [2022-12-14 10:55:37,447 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 10:55:37,448 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [90, 58, 87] total 204 [2022-12-14 10:55:37,448 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [214841969] [2022-12-14 10:55:37,448 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 10:55:37,448 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 204 states [2022-12-14 10:55:37,448 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 10:55:37,449 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 204 interpolants. [2022-12-14 10:55:37,450 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=699, Invalid=40713, Unknown=0, NotChecked=0, Total=41412 [2022-12-14 10:55:37,451 INFO L87 Difference]: Start difference. First operand 121 states and 184 transitions. Second operand has 204 states, 199 states have (on average 1.5527638190954773) internal successors, (309), 123 states have internal predecessors, (309), 57 states have call successors, (57), 1 states have call predecessors, (57), 54 states have return successors, (82), 81 states have call predecessors, (82), 57 states have call successors, (82) [2022-12-14 10:55:46,612 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 10:55:46,612 INFO L93 Difference]: Finished difference Result 137 states and 204 transitions. [2022-12-14 10:55:46,612 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 67 states. [2022-12-14 10:55:46,612 INFO L78 Accepts]: Start accepts. Automaton has has 204 states, 199 states have (on average 1.5527638190954773) internal successors, (309), 123 states have internal predecessors, (309), 57 states have call successors, (57), 1 states have call predecessors, (57), 54 states have return successors, (82), 81 states have call predecessors, (82), 57 states have call successors, (82) Word has length 201 [2022-12-14 10:55:46,613 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 10:55:46,614 INFO L225 Difference]: With dead ends: 137 [2022-12-14 10:55:46,614 INFO L226 Difference]: Without dead ends: 131 [2022-12-14 10:55:46,617 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 552 GetRequests, 263 SyntacticMatches, 27 SemanticMatches, 262 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16399 ImplicationChecksByTransitivity, 23.1s TimeCoverageRelationStatistics Valid=4623, Invalid=64809, Unknown=0, NotChecked=0, Total=69432 [2022-12-14 10:55:46,618 INFO L413 NwaCegarLoop]: 36 mSDtfsCounter, 2503 mSDsluCounter, 2777 mSDsCounter, 0 mSdLazyCounter, 10300 mSolverCounterSat, 1375 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2505 SdHoareTripleChecker+Valid, 2813 SdHoareTripleChecker+Invalid, 11675 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1375 IncrementalHoareTripleChecker+Valid, 10300 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.9s IncrementalHoareTripleChecker+Time [2022-12-14 10:55:46,618 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2505 Valid, 2813 Invalid, 11675 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1375 Valid, 10300 Invalid, 0 Unknown, 0 Unchecked, 4.9s Time] [2022-12-14 10:55:46,618 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 131 states. [2022-12-14 10:55:46,635 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 131 to 119. [2022-12-14 10:55:46,635 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 119 states, 80 states have (on average 1.05) internal successors, (84), 81 states have internal predecessors, (84), 8 states have call successors, (8), 4 states have call predecessors, (8), 30 states have return successors, (84), 33 states have call predecessors, (84), 8 states have call successors, (84) [2022-12-14 10:55:46,636 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 119 states to 119 states and 176 transitions. [2022-12-14 10:55:46,636 INFO L78 Accepts]: Start accepts. Automaton has 119 states and 176 transitions. Word has length 201 [2022-12-14 10:55:46,636 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 10:55:46,636 INFO L495 AbstractCegarLoop]: Abstraction has 119 states and 176 transitions. [2022-12-14 10:55:46,636 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 204 states, 199 states have (on average 1.5527638190954773) internal successors, (309), 123 states have internal predecessors, (309), 57 states have call successors, (57), 1 states have call predecessors, (57), 54 states have return successors, (82), 81 states have call predecessors, (82), 57 states have call successors, (82) [2022-12-14 10:55:46,636 INFO L276 IsEmpty]: Start isEmpty. Operand 119 states and 176 transitions. [2022-12-14 10:55:46,637 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 209 [2022-12-14 10:55:46,637 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 10:55:46,637 INFO L195 NwaCegarLoop]: trace histogram [29, 29, 29, 27, 27, 27, 27, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 10:55:46,644 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Ended with exit code 0 [2022-12-14 10:55:46,837 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42,41 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 10:55:46,838 INFO L420 AbstractCegarLoop]: === Iteration 44 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 10:55:46,839 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 10:55:46,839 INFO L85 PathProgramCache]: Analyzing trace with hash 900774234, now seen corresponding path program 41 times [2022-12-14 10:55:46,839 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 10:55:46,840 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1223519621] [2022-12-14 10:55:46,840 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 10:55:46,840 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 10:55:46,911 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 10:55:53,205 INFO L134 CoverageAnalysis]: Checked inductivity of 2732 backedges. 0 proven. 2322 refuted. 0 times theorem prover too weak. 410 trivial. 0 not checked. [2022-12-14 10:55:53,205 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 10:55:53,205 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1223519621] [2022-12-14 10:55:53,205 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1223519621] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 10:55:53,205 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [274998272] [2022-12-14 10:55:53,206 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 10:55:53,206 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 10:55:53,206 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 10:55:53,206 INFO L229 MonitoredProcess]: Starting monitored process 42 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 10:55:53,207 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3d8274cd-cf49-47fc-a5cb-b9e0ef94bba2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Waiting until timeout for monitored process [2022-12-14 10:55:53,899 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 29 check-sat command(s) [2022-12-14 10:55:53,899 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 10:55:53,911 WARN L261 TraceCheckSpWp]: Trace formula consists of 596 conjuncts, 348 conjunts are in the unsatisfiable core [2022-12-14 10:55:53,916 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 10:56:02,141 INFO L134 CoverageAnalysis]: Checked inductivity of 2732 backedges. 56 proven. 1263 refuted. 0 times theorem prover too weak. 1413 trivial. 0 not checked. [2022-12-14 10:56:02,141 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 10:56:28,274 INFO L134 CoverageAnalysis]: Checked inductivity of 2732 backedges. 87 proven. 2239 refuted. 0 times theorem prover too weak. 406 trivial. 0 not checked. [2022-12-14 10:56:28,274 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [274998272] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 10:56:28,274 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2116929883] [2022-12-14 10:56:28,275 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-12-14 10:56:28,275 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 10:56:28,275 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:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) 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) [2022-12-14 10:56:28,275 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 10:56:28,276 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [93, 64, 94] total 216 [2022-12-14 10:56:28,276 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [974547072] [2022-12-14 10:56:28,276 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 10:56:28,276 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 216 states [2022-12-14 10:56:28,276 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 10:56:28,277 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 216 interpolants. [2022-12-14 10:56:28,279 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=879, Invalid=45561, Unknown=0, NotChecked=0, Total=46440 [2022-12-14 10:56:28,279 INFO L87 Difference]: Start difference. First operand 119 states and 176 transitions. Second operand has 216 states, 209 states have (on average 1.555023923444976) internal successors, (325), 132 states have internal predecessors, (325), 60 states have call successors, (60), 1 states have call predecessors, (60), 56 states have return successors, (86), 84 states have call predecessors, (86), 60 states have call successors, (86)