./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/recursive-simple/fibo_2calls_15-2.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 4e7fbc69 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_bb574073-9495-45bc-a341-0cb647c55fc4/bin/utaipan-Q6hlc19bkW/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb574073-9495-45bc-a341-0cb647c55fc4/bin/utaipan-Q6hlc19bkW/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb574073-9495-45bc-a341-0cb647c55fc4/bin/utaipan-Q6hlc19bkW/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb574073-9495-45bc-a341-0cb647c55fc4/bin/utaipan-Q6hlc19bkW/config/TaipanReach.xml -i ../../sv-benchmarks/c/recursive-simple/fibo_2calls_15-2.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb574073-9495-45bc-a341-0cb647c55fc4/bin/utaipan-Q6hlc19bkW/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb574073-9495-45bc-a341-0cb647c55fc4/bin/utaipan-Q6hlc19bkW --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 d89b24ddcb39bc81f78fa19f2306b45fb625208ffa4463b75f31372afe08085d --- 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-4e7fbc6 [2022-11-23 15:14:55,050 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-11-23 15:14:55,052 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-11-23 15:14:55,092 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-11-23 15:14:55,093 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-11-23 15:14:55,094 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-11-23 15:14:55,096 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-11-23 15:14:55,098 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-11-23 15:14:55,109 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-11-23 15:14:55,118 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-11-23 15:14:55,119 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-11-23 15:14:55,121 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-11-23 15:14:55,122 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-11-23 15:14:55,126 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-11-23 15:14:55,127 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-11-23 15:14:55,129 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-11-23 15:14:55,130 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-11-23 15:14:55,131 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-11-23 15:14:55,133 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-11-23 15:14:55,135 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-11-23 15:14:55,137 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-11-23 15:14:55,138 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-11-23 15:14:55,140 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-11-23 15:14:55,141 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-11-23 15:14:55,145 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-11-23 15:14:55,145 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-11-23 15:14:55,146 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-11-23 15:14:55,147 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-11-23 15:14:55,147 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-11-23 15:14:55,149 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-11-23 15:14:55,149 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-11-23 15:14:55,150 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-11-23 15:14:55,151 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-11-23 15:14:55,152 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-11-23 15:14:55,153 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-11-23 15:14:55,154 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-11-23 15:14:55,155 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-11-23 15:14:55,155 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-11-23 15:14:55,155 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-11-23 15:14:55,156 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-11-23 15:14:55,157 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-11-23 15:14:55,158 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb574073-9495-45bc-a341-0cb647c55fc4/bin/utaipan-Q6hlc19bkW/config/svcomp-Reach-32bit-Taipan_Default.epf [2022-11-23 15:14:55,206 INFO L113 SettingsManager]: Loading preferences was successful [2022-11-23 15:14:55,207 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-11-23 15:14:55,208 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-11-23 15:14:55,208 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-11-23 15:14:55,209 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-11-23 15:14:55,209 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-11-23 15:14:55,210 INFO L138 SettingsManager]: * User list type=DISABLED [2022-11-23 15:14:55,210 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-11-23 15:14:55,210 INFO L138 SettingsManager]: * Explicit value domain=true [2022-11-23 15:14:55,211 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-11-23 15:14:55,212 INFO L138 SettingsManager]: * Octagon Domain=false [2022-11-23 15:14:55,212 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-11-23 15:14:55,213 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-11-23 15:14:55,213 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-11-23 15:14:55,213 INFO L138 SettingsManager]: * Interval Domain=false [2022-11-23 15:14:55,213 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-11-23 15:14:55,214 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-11-23 15:14:55,214 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-11-23 15:14:55,215 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-11-23 15:14:55,215 INFO L138 SettingsManager]: * sizeof long=4 [2022-11-23 15:14:55,215 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-11-23 15:14:55,216 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-11-23 15:14:55,216 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-11-23 15:14:55,216 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-11-23 15:14:55,217 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-11-23 15:14:55,217 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-11-23 15:14:55,217 INFO L138 SettingsManager]: * sizeof long double=12 [2022-11-23 15:14:55,217 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-11-23 15:14:55,218 INFO L138 SettingsManager]: * Use constant arrays=true [2022-11-23 15:14:55,218 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-11-23 15:14:55,218 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-11-23 15:14:55,219 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-11-23 15:14:55,219 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-23 15:14:55,220 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-11-23 15:14:55,220 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-11-23 15:14:55,220 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-11-23 15:14:55,220 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-11-23 15:14:55,221 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-11-23 15:14:55,221 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-11-23 15:14:55,221 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-11-23 15:14:55,222 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-11-23 15:14:55,222 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_bb574073-9495-45bc-a341-0cb647c55fc4/bin/utaipan-Q6hlc19bkW/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb574073-9495-45bc-a341-0cb647c55fc4/bin/utaipan-Q6hlc19bkW Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> d89b24ddcb39bc81f78fa19f2306b45fb625208ffa4463b75f31372afe08085d [2022-11-23 15:14:55,544 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-11-23 15:14:55,569 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-11-23 15:14:55,572 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-11-23 15:14:55,574 INFO L271 PluginConnector]: Initializing CDTParser... [2022-11-23 15:14:55,575 INFO L275 PluginConnector]: CDTParser initialized [2022-11-23 15:14:55,576 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb574073-9495-45bc-a341-0cb647c55fc4/bin/utaipan-Q6hlc19bkW/../../sv-benchmarks/c/recursive-simple/fibo_2calls_15-2.c [2022-11-23 15:14:58,942 INFO L500 CDTParser]: Created temporary CDT project at NULL [2022-11-23 15:14:59,148 INFO L351 CDTParser]: Found 1 translation units. [2022-11-23 15:14:59,149 INFO L172 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb574073-9495-45bc-a341-0cb647c55fc4/sv-benchmarks/c/recursive-simple/fibo_2calls_15-2.c [2022-11-23 15:14:59,156 INFO L394 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb574073-9495-45bc-a341-0cb647c55fc4/bin/utaipan-Q6hlc19bkW/data/1ea17136e/a0853f2a5bf148c88904355b3d409e17/FLAGa10c1bb40 [2022-11-23 15:14:59,172 INFO L402 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb574073-9495-45bc-a341-0cb647c55fc4/bin/utaipan-Q6hlc19bkW/data/1ea17136e/a0853f2a5bf148c88904355b3d409e17 [2022-11-23 15:14:59,175 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-11-23 15:14:59,176 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-11-23 15:14:59,178 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-11-23 15:14:59,178 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-11-23 15:14:59,182 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-11-23 15:14:59,183 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 03:14:59" (1/1) ... [2022-11-23 15:14:59,184 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6e14d052 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:14:59, skipping insertion in model container [2022-11-23 15:14:59,184 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 03:14:59" (1/1) ... [2022-11-23 15:14:59,193 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-11-23 15:14:59,208 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-11-23 15:14:59,391 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_bb574073-9495-45bc-a341-0cb647c55fc4/sv-benchmarks/c/recursive-simple/fibo_2calls_15-2.c[950,963] [2022-11-23 15:14:59,398 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-23 15:14:59,413 INFO L203 MainTranslator]: Completed pre-run [2022-11-23 15:14:59,438 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_bb574073-9495-45bc-a341-0cb647c55fc4/sv-benchmarks/c/recursive-simple/fibo_2calls_15-2.c[950,963] [2022-11-23 15:14:59,439 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-23 15:14:59,454 INFO L208 MainTranslator]: Completed translation [2022-11-23 15:14:59,455 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:14:59 WrapperNode [2022-11-23 15:14:59,455 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-11-23 15:14:59,456 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-11-23 15:14:59,457 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-11-23 15:14:59,457 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-11-23 15:14:59,466 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:14:59" (1/1) ... [2022-11-23 15:14:59,473 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:14:59" (1/1) ... [2022-11-23 15:14:59,491 INFO L138 Inliner]: procedures = 14, calls = 12, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 21 [2022-11-23 15:14:59,492 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-11-23 15:14:59,493 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-11-23 15:14:59,493 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-11-23 15:14:59,493 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-11-23 15:14:59,503 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:14:59" (1/1) ... [2022-11-23 15:14:59,504 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:14:59" (1/1) ... [2022-11-23 15:14:59,519 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:14:59" (1/1) ... [2022-11-23 15:14:59,519 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:14:59" (1/1) ... [2022-11-23 15:14:59,522 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:14:59" (1/1) ... [2022-11-23 15:14:59,527 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:14:59" (1/1) ... [2022-11-23 15:14:59,530 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:14:59" (1/1) ... [2022-11-23 15:14:59,536 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:14:59" (1/1) ... [2022-11-23 15:14:59,537 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-11-23 15:14:59,546 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-11-23 15:14:59,546 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-11-23 15:14:59,547 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-11-23 15:14:59,548 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:14:59" (1/1) ... [2022-11-23 15:14:59,557 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-23 15:14:59,569 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb574073-9495-45bc-a341-0cb647c55fc4/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 15:14:59,583 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb574073-9495-45bc-a341-0cb647c55fc4/bin/utaipan-Q6hlc19bkW/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-11-23 15:14:59,587 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb574073-9495-45bc-a341-0cb647c55fc4/bin/utaipan-Q6hlc19bkW/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-11-23 15:14:59,627 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-11-23 15:14:59,627 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-11-23 15:14:59,627 INFO L130 BoogieDeclarations]: Found specification of procedure fibo2 [2022-11-23 15:14:59,628 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo2 [2022-11-23 15:14:59,628 INFO L130 BoogieDeclarations]: Found specification of procedure fibo1 [2022-11-23 15:14:59,628 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo1 [2022-11-23 15:14:59,628 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-11-23 15:14:59,628 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-11-23 15:14:59,701 INFO L235 CfgBuilder]: Building ICFG [2022-11-23 15:14:59,704 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-11-23 15:14:59,839 INFO L276 CfgBuilder]: Performing block encoding [2022-11-23 15:14:59,857 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-11-23 15:14:59,857 INFO L300 CfgBuilder]: Removed 0 assume(true) statements. [2022-11-23 15:14:59,860 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 03:14:59 BoogieIcfgContainer [2022-11-23 15:14:59,860 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-11-23 15:14:59,863 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-11-23 15:14:59,863 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-11-23 15:14:59,867 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-11-23 15:14:59,867 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 03:14:59" (1/3) ... [2022-11-23 15:14:59,868 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5d33c56f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 03:14:59, skipping insertion in model container [2022-11-23 15:14:59,868 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:14:59" (2/3) ... [2022-11-23 15:14:59,869 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5d33c56f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 03:14:59, skipping insertion in model container [2022-11-23 15:14:59,869 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 03:14:59" (3/3) ... [2022-11-23 15:14:59,871 INFO L112 eAbstractionObserver]: Analyzing ICFG fibo_2calls_15-2.c [2022-11-23 15:14:59,902 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-11-23 15:14:59,902 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-11-23 15:14:59,983 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-11-23 15:14:59,993 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;@36aeb338, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-11-23 15:14:59,994 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-11-23 15:14:59,999 INFO L276 IsEmpty]: Start isEmpty. Operand has 26 states, 17 states have (on average 1.3529411764705883) internal successors, (23), 18 states have internal predecessors, (23), 5 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-11-23 15:15:00,017 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2022-11-23 15:15:00,018 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 15:15:00,019 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 15:15:00,019 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 15:15:00,031 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 15:15:00,031 INFO L85 PathProgramCache]: Analyzing trace with hash 2097990987, now seen corresponding path program 1 times [2022-11-23 15:15:00,044 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 15:15:00,044 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [928704494] [2022-11-23 15:15:00,045 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:15:00,045 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 15:15:00,210 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:15:00,398 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 15:15:00,399 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 15:15:00,399 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [928704494] [2022-11-23 15:15:00,400 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [928704494] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 15:15:00,401 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-23 15:15:00,401 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-11-23 15:15:00,403 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [162429000] [2022-11-23 15:15:00,404 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 15:15:00,410 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-23 15:15:00,410 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 15:15:00,445 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-23 15:15:00,446 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-11-23 15:15:00,449 INFO L87 Difference]: Start difference. First operand has 26 states, 17 states have (on average 1.3529411764705883) internal successors, (23), 18 states have internal predecessors, (23), 5 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) Second operand has 5 states, 4 states have (on average 1.75) internal successors, (7), 4 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-11-23 15:15:00,600 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 15:15:00,601 INFO L93 Difference]: Finished difference Result 34 states and 43 transitions. [2022-11-23 15:15:00,602 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-11-23 15:15:00,604 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 1.75) internal successors, (7), 4 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 9 [2022-11-23 15:15:00,605 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 15:15:00,630 INFO L225 Difference]: With dead ends: 34 [2022-11-23 15:15:00,631 INFO L226 Difference]: Without dead ends: 26 [2022-11-23 15:15:00,634 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2022-11-23 15:15:00,639 INFO L413 NwaCegarLoop]: 23 mSDtfsCounter, 13 mSDsluCounter, 43 mSDsCounter, 0 mSdLazyCounter, 44 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 66 SdHoareTripleChecker+Invalid, 44 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 44 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-23 15:15:00,640 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [16 Valid, 66 Invalid, 44 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 44 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-23 15:15:00,662 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2022-11-23 15:15:00,687 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2022-11-23 15:15:00,689 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 17 states have (on average 1.2352941176470589) internal successors, (21), 18 states have internal predecessors, (21), 5 states have call successors, (5), 2 states have call predecessors, (5), 3 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) [2022-11-23 15:15:00,691 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 33 transitions. [2022-11-23 15:15:00,693 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 33 transitions. Word has length 9 [2022-11-23 15:15:00,693 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 15:15:00,694 INFO L495 AbstractCegarLoop]: Abstraction has 26 states and 33 transitions. [2022-11-23 15:15:00,694 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 1.75) internal successors, (7), 4 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-11-23 15:15:00,694 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 33 transitions. [2022-11-23 15:15:00,696 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2022-11-23 15:15:00,696 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 15:15:00,697 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 15:15:00,697 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-11-23 15:15:00,698 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 15:15:00,698 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 15:15:00,698 INFO L85 PathProgramCache]: Analyzing trace with hash 1328370967, now seen corresponding path program 1 times [2022-11-23 15:15:00,699 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 15:15:00,699 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [877870679] [2022-11-23 15:15:00,699 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:15:00,700 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 15:15:00,712 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:15:00,783 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 15:15:00,783 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 15:15:00,784 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [877870679] [2022-11-23 15:15:00,784 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [877870679] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 15:15:00,784 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-23 15:15:00,785 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-11-23 15:15:00,785 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [935728949] [2022-11-23 15:15:00,785 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 15:15:00,787 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-23 15:15:00,787 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 15:15:00,788 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-23 15:15:00,788 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-11-23 15:15:00,789 INFO L87 Difference]: Start difference. First operand 26 states and 33 transitions. Second operand has 5 states, 4 states have (on average 2.0) internal successors, (8), 4 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-11-23 15:15:00,883 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 15:15:00,884 INFO L93 Difference]: Finished difference Result 32 states and 40 transitions. [2022-11-23 15:15:00,884 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-11-23 15:15:00,885 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 2.0) internal successors, (8), 4 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 10 [2022-11-23 15:15:00,885 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 15:15:00,886 INFO L225 Difference]: With dead ends: 32 [2022-11-23 15:15:00,887 INFO L226 Difference]: Without dead ends: 28 [2022-11-23 15:15:00,887 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2022-11-23 15:15:00,889 INFO L413 NwaCegarLoop]: 22 mSDtfsCounter, 10 mSDsluCounter, 41 mSDsCounter, 0 mSdLazyCounter, 40 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 63 SdHoareTripleChecker+Invalid, 41 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 40 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-23 15:15:00,890 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [13 Valid, 63 Invalid, 41 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 40 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-23 15:15:00,891 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2022-11-23 15:15:00,898 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 26. [2022-11-23 15:15:00,899 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 17 states have (on average 1.2352941176470589) internal successors, (21), 18 states have internal predecessors, (21), 5 states have call successors, (5), 2 states have call predecessors, (5), 3 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) [2022-11-23 15:15:00,900 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 33 transitions. [2022-11-23 15:15:00,901 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 33 transitions. Word has length 10 [2022-11-23 15:15:00,901 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 15:15:00,901 INFO L495 AbstractCegarLoop]: Abstraction has 26 states and 33 transitions. [2022-11-23 15:15:00,902 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 2.0) internal successors, (8), 4 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-11-23 15:15:00,902 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 33 transitions. [2022-11-23 15:15:00,903 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2022-11-23 15:15:00,903 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 15:15:00,904 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 15:15:00,904 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-11-23 15:15:00,904 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 15:15:00,905 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 15:15:00,905 INFO L85 PathProgramCache]: Analyzing trace with hash -1296553538, now seen corresponding path program 1 times [2022-11-23 15:15:00,905 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 15:15:00,906 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1279533537] [2022-11-23 15:15:00,906 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:15:00,906 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 15:15:00,923 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:15:01,037 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-23 15:15:01,038 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 15:15:01,038 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1279533537] [2022-11-23 15:15:01,038 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1279533537] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 15:15:01,039 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1112616842] [2022-11-23 15:15:01,039 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:15:01,039 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:15:01,040 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb574073-9495-45bc-a341-0cb647c55fc4/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 15:15:01,044 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb574073-9495-45bc-a341-0cb647c55fc4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 15:15:01,078 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb574073-9495-45bc-a341-0cb647c55fc4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-11-23 15:15:01,138 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:15:01,141 INFO L263 TraceCheckSpWp]: Trace formula consists of 74 conjuncts, 6 conjunts are in the unsatisfiable core [2022-11-23 15:15:01,147 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 15:15:01,263 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-23 15:15:01,263 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 15:15:01,658 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-23 15:15:01,658 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1112616842] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 15:15:01,659 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [623960343] [2022-11-23 15:15:01,683 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2022-11-23 15:15:01,683 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 15:15:01,686 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 15:15:01,693 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 15:15:01,694 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 15:15:01,843 INFO L197 IcfgInterpreter]: Interpreting procedure fibo1 with input of size 39 for LOIs [2022-11-23 15:15:01,897 INFO L197 IcfgInterpreter]: Interpreting procedure fibo2 with input of size 39 for LOIs [2022-11-23 15:15:01,908 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 15:15:02,370 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSifa [623960343] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 15:15:02,371 INFO L184 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2022-11-23 15:15:02,371 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [6, 7, 7] total 17 [2022-11-23 15:15:02,372 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [666093883] [2022-11-23 15:15:02,373 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 15:15:02,387 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-11-23 15:15:02,389 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 15:15:02,390 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-11-23 15:15:02,392 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=224, Unknown=0, NotChecked=0, Total=272 [2022-11-23 15:15:02,392 INFO L87 Difference]: Start difference. First operand 26 states and 33 transitions. Second operand has 7 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 4 states have internal predecessors, (13), 3 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (3), 1 states have call predecessors, (3), 3 states have call successors, (3) [2022-11-23 15:15:02,593 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 15:15:02,593 INFO L93 Difference]: Finished difference Result 68 states and 91 transitions. [2022-11-23 15:15:02,594 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-11-23 15:15:02,594 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 4 states have internal predecessors, (13), 3 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (3), 1 states have call predecessors, (3), 3 states have call successors, (3) Word has length 22 [2022-11-23 15:15:02,595 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 15:15:02,600 INFO L225 Difference]: With dead ends: 68 [2022-11-23 15:15:02,601 INFO L226 Difference]: Without dead ends: 44 [2022-11-23 15:15:02,602 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 52 SyntacticMatches, 4 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 53 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=48, Invalid=224, Unknown=0, NotChecked=0, Total=272 [2022-11-23 15:15:02,606 INFO L413 NwaCegarLoop]: 30 mSDtfsCounter, 23 mSDsluCounter, 62 mSDsCounter, 0 mSdLazyCounter, 52 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 28 SdHoareTripleChecker+Valid, 92 SdHoareTripleChecker+Invalid, 59 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 52 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-23 15:15:02,607 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [28 Valid, 92 Invalid, 59 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 52 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-23 15:15:02,610 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2022-11-23 15:15:02,630 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 42. [2022-11-23 15:15:02,631 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 28 states have (on average 1.1428571428571428) internal successors, (32), 28 states have internal predecessors, (32), 9 states have call successors, (9), 4 states have call predecessors, (9), 4 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2022-11-23 15:15:02,633 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 50 transitions. [2022-11-23 15:15:02,634 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 50 transitions. Word has length 22 [2022-11-23 15:15:02,635 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 15:15:02,635 INFO L495 AbstractCegarLoop]: Abstraction has 42 states and 50 transitions. [2022-11-23 15:15:02,636 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 4 states have internal predecessors, (13), 3 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (3), 1 states have call predecessors, (3), 3 states have call successors, (3) [2022-11-23 15:15:02,636 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 50 transitions. [2022-11-23 15:15:02,641 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2022-11-23 15:15:02,641 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 15:15:02,641 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 15:15:02,655 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb574073-9495-45bc-a341-0cb647c55fc4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-11-23 15:15:02,848 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb574073-9495-45bc-a341-0cb647c55fc4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:15:02,848 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 15:15:02,849 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 15:15:02,849 INFO L85 PathProgramCache]: Analyzing trace with hash -28918515, now seen corresponding path program 1 times [2022-11-23 15:15:02,849 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 15:15:02,850 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1175555895] [2022-11-23 15:15:02,850 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:15:02,850 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 15:15:02,868 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:15:03,027 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 5 proven. 5 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-23 15:15:03,028 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 15:15:03,029 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1175555895] [2022-11-23 15:15:03,029 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1175555895] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 15:15:03,029 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [561325313] [2022-11-23 15:15:03,030 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:15:03,030 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:15:03,030 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb574073-9495-45bc-a341-0cb647c55fc4/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 15:15:03,032 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb574073-9495-45bc-a341-0cb647c55fc4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 15:15:03,055 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb574073-9495-45bc-a341-0cb647c55fc4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-11-23 15:15:03,118 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:15:03,120 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 8 conjunts are in the unsatisfiable core [2022-11-23 15:15:03,125 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 15:15:03,268 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2022-11-23 15:15:03,268 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 15:15:03,765 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 2 proven. 10 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-23 15:15:03,765 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [561325313] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 15:15:03,765 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1910362505] [2022-11-23 15:15:03,779 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2022-11-23 15:15:03,779 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 15:15:03,781 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:336) 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) [2022-11-23 15:15:03,785 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 15:15:03,785 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 8, 9] total 14 [2022-11-23 15:15:03,786 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [376929537] [2022-11-23 15:15:03,786 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 15:15:03,788 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-11-23 15:15:03,789 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 15:15:03,789 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-11-23 15:15:03,790 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2022-11-23 15:15:03,791 INFO L87 Difference]: Start difference. First operand 42 states and 50 transitions. Second operand has 14 states, 11 states have (on average 4.0) internal successors, (44), 14 states have internal predecessors, (44), 11 states have call successors, (13), 1 states have call predecessors, (13), 5 states have return successors, (13), 3 states have call predecessors, (13), 11 states have call successors, (13) [2022-11-23 15:15:04,081 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 15:15:04,081 INFO L93 Difference]: Finished difference Result 85 states and 121 transitions. [2022-11-23 15:15:04,081 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-11-23 15:15:04,082 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 11 states have (on average 4.0) internal successors, (44), 14 states have internal predecessors, (44), 11 states have call successors, (13), 1 states have call predecessors, (13), 5 states have return successors, (13), 3 states have call predecessors, (13), 11 states have call successors, (13) Word has length 35 [2022-11-23 15:15:04,082 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 15:15:04,087 INFO L225 Difference]: With dead ends: 85 [2022-11-23 15:15:04,087 INFO L226 Difference]: Without dead ends: 53 [2022-11-23 15:15:04,089 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 63 SyntacticMatches, 3 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=75, Invalid=305, Unknown=0, NotChecked=0, Total=380 [2022-11-23 15:15:04,095 INFO L413 NwaCegarLoop]: 18 mSDtfsCounter, 38 mSDsluCounter, 77 mSDsCounter, 0 mSdLazyCounter, 204 mSolverCounterSat, 27 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 43 SdHoareTripleChecker+Valid, 95 SdHoareTripleChecker+Invalid, 231 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 27 IncrementalHoareTripleChecker+Valid, 204 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-23 15:15:04,101 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [43 Valid, 95 Invalid, 231 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [27 Valid, 204 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-23 15:15:04,103 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2022-11-23 15:15:04,120 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 44. [2022-11-23 15:15:04,120 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 44 states, 29 states have (on average 1.1379310344827587) internal successors, (33), 30 states have internal predecessors, (33), 9 states have call successors, (9), 4 states have call predecessors, (9), 5 states have return successors, (11), 9 states have call predecessors, (11), 9 states have call successors, (11) [2022-11-23 15:15:04,124 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 53 transitions. [2022-11-23 15:15:04,126 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 53 transitions. Word has length 35 [2022-11-23 15:15:04,126 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 15:15:04,127 INFO L495 AbstractCegarLoop]: Abstraction has 44 states and 53 transitions. [2022-11-23 15:15:04,128 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 11 states have (on average 4.0) internal successors, (44), 14 states have internal predecessors, (44), 11 states have call successors, (13), 1 states have call predecessors, (13), 5 states have return successors, (13), 3 states have call predecessors, (13), 11 states have call successors, (13) [2022-11-23 15:15:04,134 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 53 transitions. [2022-11-23 15:15:04,135 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2022-11-23 15:15:04,137 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 15:15:04,138 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 15:15:04,150 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb574073-9495-45bc-a341-0cb647c55fc4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-11-23 15:15:04,344 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb574073-9495-45bc-a341-0cb647c55fc4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:15:04,344 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 15:15:04,345 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 15:15:04,345 INFO L85 PathProgramCache]: Analyzing trace with hash -243412115, now seen corresponding path program 1 times [2022-11-23 15:15:04,345 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 15:15:04,346 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [203546965] [2022-11-23 15:15:04,346 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:15:04,346 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 15:15:04,372 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:15:04,564 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 4 proven. 3 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-23 15:15:04,564 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 15:15:04,564 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [203546965] [2022-11-23 15:15:04,565 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [203546965] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 15:15:04,565 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [254537652] [2022-11-23 15:15:04,565 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:15:04,565 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:15:04,566 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb574073-9495-45bc-a341-0cb647c55fc4/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 15:15:04,567 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb574073-9495-45bc-a341-0cb647c55fc4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 15:15:04,571 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb574073-9495-45bc-a341-0cb647c55fc4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-11-23 15:15:04,660 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:15:04,662 INFO L263 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 8 conjunts are in the unsatisfiable core [2022-11-23 15:15:04,673 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 15:15:04,828 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-23 15:15:04,829 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 15:15:05,284 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 2 proven. 11 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-23 15:15:05,285 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [254537652] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 15:15:05,285 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [792072137] [2022-11-23 15:15:05,292 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2022-11-23 15:15:05,292 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 15:15:05,293 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:336) 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) [2022-11-23 15:15:05,294 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 15:15:05,294 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8, 9] total 18 [2022-11-23 15:15:05,294 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1581963501] [2022-11-23 15:15:05,295 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 15:15:05,295 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2022-11-23 15:15:05,296 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 15:15:05,296 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2022-11-23 15:15:05,296 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=257, Unknown=0, NotChecked=0, Total=306 [2022-11-23 15:15:05,297 INFO L87 Difference]: Start difference. First operand 44 states and 53 transitions. Second operand has 18 states, 16 states have (on average 3.0625) internal successors, (49), 18 states have internal predecessors, (49), 11 states have call successors, (13), 1 states have call predecessors, (13), 7 states have return successors, (13), 6 states have call predecessors, (13), 11 states have call successors, (13) [2022-11-23 15:15:05,946 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 15:15:05,946 INFO L93 Difference]: Finished difference Result 121 states and 203 transitions. [2022-11-23 15:15:05,949 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2022-11-23 15:15:05,950 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 16 states have (on average 3.0625) internal successors, (49), 18 states have internal predecessors, (49), 11 states have call successors, (13), 1 states have call predecessors, (13), 7 states have return successors, (13), 6 states have call predecessors, (13), 11 states have call successors, (13) Word has length 36 [2022-11-23 15:15:05,950 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 15:15:05,952 INFO L225 Difference]: With dead ends: 121 [2022-11-23 15:15:05,952 INFO L226 Difference]: Without dead ends: 77 [2022-11-23 15:15:05,954 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 68 SyntacticMatches, 3 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 125 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=142, Invalid=670, Unknown=0, NotChecked=0, Total=812 [2022-11-23 15:15:05,955 INFO L413 NwaCegarLoop]: 27 mSDtfsCounter, 63 mSDsluCounter, 139 mSDsCounter, 0 mSdLazyCounter, 413 mSolverCounterSat, 74 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 67 SdHoareTripleChecker+Valid, 166 SdHoareTripleChecker+Invalid, 487 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 74 IncrementalHoareTripleChecker+Valid, 413 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-23 15:15:05,955 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [67 Valid, 166 Invalid, 487 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [74 Valid, 413 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-23 15:15:05,956 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2022-11-23 15:15:05,975 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 63. [2022-11-23 15:15:05,976 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 40 states have (on average 1.15) internal successors, (46), 43 states have internal predecessors, (46), 14 states have call successors, (14), 5 states have call predecessors, (14), 8 states have return successors, (31), 14 states have call predecessors, (31), 14 states have call successors, (31) [2022-11-23 15:15:05,977 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 91 transitions. [2022-11-23 15:15:05,977 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 91 transitions. Word has length 36 [2022-11-23 15:15:05,978 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 15:15:05,978 INFO L495 AbstractCegarLoop]: Abstraction has 63 states and 91 transitions. [2022-11-23 15:15:05,978 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 16 states have (on average 3.0625) internal successors, (49), 18 states have internal predecessors, (49), 11 states have call successors, (13), 1 states have call predecessors, (13), 7 states have return successors, (13), 6 states have call predecessors, (13), 11 states have call successors, (13) [2022-11-23 15:15:05,978 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 91 transitions. [2022-11-23 15:15:05,981 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2022-11-23 15:15:05,981 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 15:15:05,981 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 15:15:05,994 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb574073-9495-45bc-a341-0cb647c55fc4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-11-23 15:15:06,188 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb574073-9495-45bc-a341-0cb647c55fc4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:15:06,188 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 15:15:06,189 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 15:15:06,189 INFO L85 PathProgramCache]: Analyzing trace with hash 403750738, now seen corresponding path program 1 times [2022-11-23 15:15:06,189 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 15:15:06,189 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [174785428] [2022-11-23 15:15:06,189 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:15:06,189 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 15:15:06,208 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:15:06,343 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 12 proven. 12 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2022-11-23 15:15:06,344 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 15:15:06,344 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [174785428] [2022-11-23 15:15:06,344 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [174785428] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 15:15:06,344 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1187309463] [2022-11-23 15:15:06,345 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:15:06,345 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:15:06,345 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb574073-9495-45bc-a341-0cb647c55fc4/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 15:15:06,348 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb574073-9495-45bc-a341-0cb647c55fc4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 15:15:06,379 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb574073-9495-45bc-a341-0cb647c55fc4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-11-23 15:15:06,437 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:15:06,439 INFO L263 TraceCheckSpWp]: Trace formula consists of 136 conjuncts, 10 conjunts are in the unsatisfiable core [2022-11-23 15:15:06,446 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 15:15:06,604 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 4 proven. 23 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2022-11-23 15:15:06,605 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 15:15:07,313 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 4 proven. 28 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-11-23 15:15:07,313 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1187309463] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 15:15:07,314 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [860404384] [2022-11-23 15:15:07,318 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2022-11-23 15:15:07,318 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 15:15:07,318 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:336) 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) [2022-11-23 15:15:07,319 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 15:15:07,319 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9, 11] total 17 [2022-11-23 15:15:07,319 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [401815175] [2022-11-23 15:15:07,319 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 15:15:07,321 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2022-11-23 15:15:07,321 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 15:15:07,322 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2022-11-23 15:15:07,322 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2022-11-23 15:15:07,323 INFO L87 Difference]: Start difference. First operand 63 states and 91 transitions. Second operand has 17 states, 15 states have (on average 3.6) internal successors, (54), 17 states have internal predecessors, (54), 12 states have call successors, (14), 1 states have call predecessors, (14), 8 states have return successors, (18), 8 states have call predecessors, (18), 12 states have call successors, (18) [2022-11-23 15:15:07,623 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 15:15:07,623 INFO L93 Difference]: Finished difference Result 119 states and 203 transitions. [2022-11-23 15:15:07,623 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-11-23 15:15:07,624 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 15 states have (on average 3.6) internal successors, (54), 17 states have internal predecessors, (54), 12 states have call successors, (14), 1 states have call predecessors, (14), 8 states have return successors, (18), 8 states have call predecessors, (18), 12 states have call successors, (18) Word has length 50 [2022-11-23 15:15:07,624 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 15:15:07,626 INFO L225 Difference]: With dead ends: 119 [2022-11-23 15:15:07,626 INFO L226 Difference]: Without dead ends: 97 [2022-11-23 15:15:07,627 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 117 GetRequests, 91 SyntacticMatches, 4 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 108 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=115, Invalid=437, Unknown=0, NotChecked=0, Total=552 [2022-11-23 15:15:07,628 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 59 mSDsluCounter, 57 mSDsCounter, 0 mSdLazyCounter, 138 mSolverCounterSat, 68 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 72 SdHoareTripleChecker+Valid, 73 SdHoareTripleChecker+Invalid, 206 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 68 IncrementalHoareTripleChecker+Valid, 138 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-23 15:15:07,628 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [72 Valid, 73 Invalid, 206 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [68 Valid, 138 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-23 15:15:07,629 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2022-11-23 15:15:07,667 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 72. [2022-11-23 15:15:07,668 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 72 states, 46 states have (on average 1.1304347826086956) internal successors, (52), 49 states have internal predecessors, (52), 14 states have call successors, (14), 5 states have call predecessors, (14), 11 states have return successors, (39), 17 states have call predecessors, (39), 14 states have call successors, (39) [2022-11-23 15:15:07,669 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 105 transitions. [2022-11-23 15:15:07,670 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 105 transitions. Word has length 50 [2022-11-23 15:15:07,670 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 15:15:07,670 INFO L495 AbstractCegarLoop]: Abstraction has 72 states and 105 transitions. [2022-11-23 15:15:07,671 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 15 states have (on average 3.6) internal successors, (54), 17 states have internal predecessors, (54), 12 states have call successors, (14), 1 states have call predecessors, (14), 8 states have return successors, (18), 8 states have call predecessors, (18), 12 states have call successors, (18) [2022-11-23 15:15:07,671 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 105 transitions. [2022-11-23 15:15:07,674 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2022-11-23 15:15:07,674 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 15:15:07,675 INFO L195 NwaCegarLoop]: trace histogram [7, 7, 6, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 15:15:07,687 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb574073-9495-45bc-a341-0cb647c55fc4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-11-23 15:15:07,881 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb574073-9495-45bc-a341-0cb647c55fc4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:15:07,882 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 15:15:07,882 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 15:15:07,882 INFO L85 PathProgramCache]: Analyzing trace with hash 1766289300, now seen corresponding path program 1 times [2022-11-23 15:15:07,882 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 15:15:07,882 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [459186556] [2022-11-23 15:15:07,882 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:15:07,883 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 15:15:07,915 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:15:08,226 INFO L134 CoverageAnalysis]: Checked inductivity of 145 backedges. 39 proven. 42 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2022-11-23 15:15:08,226 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 15:15:08,226 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [459186556] [2022-11-23 15:15:08,226 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [459186556] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 15:15:08,226 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [442970641] [2022-11-23 15:15:08,227 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:15:08,227 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:15:08,228 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb574073-9495-45bc-a341-0cb647c55fc4/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 15:15:08,230 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb574073-9495-45bc-a341-0cb647c55fc4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 15:15:08,241 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb574073-9495-45bc-a341-0cb647c55fc4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-11-23 15:15:08,350 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:15:08,351 INFO L263 TraceCheckSpWp]: Trace formula consists of 200 conjuncts, 12 conjunts are in the unsatisfiable core [2022-11-23 15:15:08,363 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 15:15:08,538 INFO L134 CoverageAnalysis]: Checked inductivity of 145 backedges. 12 proven. 71 refuted. 0 times theorem prover too weak. 62 trivial. 0 not checked. [2022-11-23 15:15:08,538 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 15:15:09,645 INFO L134 CoverageAnalysis]: Checked inductivity of 145 backedges. 12 proven. 81 refuted. 0 times theorem prover too weak. 52 trivial. 0 not checked. [2022-11-23 15:15:09,645 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [442970641] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 15:15:09,645 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [736417065] [2022-11-23 15:15:09,648 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2022-11-23 15:15:09,648 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 15:15:09,649 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:336) 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) [2022-11-23 15:15:09,650 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 15:15:09,650 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10, 13] total 23 [2022-11-23 15:15:09,650 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [122901354] [2022-11-23 15:15:09,650 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 15:15:09,651 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2022-11-23 15:15:09,651 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 15:15:09,652 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2022-11-23 15:15:09,652 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=439, Unknown=0, NotChecked=0, Total=506 [2022-11-23 15:15:09,653 INFO L87 Difference]: Start difference. First operand 72 states and 105 transitions. Second operand has 23 states, 21 states have (on average 3.4285714285714284) internal successors, (72), 23 states have internal predecessors, (72), 18 states have call successors, (22), 1 states have call predecessors, (22), 9 states have return successors, (25), 10 states have call predecessors, (25), 18 states have call successors, (25) [2022-11-23 15:15:10,673 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 15:15:10,673 INFO L93 Difference]: Finished difference Result 204 states and 411 transitions. [2022-11-23 15:15:10,674 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2022-11-23 15:15:10,674 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 21 states have (on average 3.4285714285714284) internal successors, (72), 23 states have internal predecessors, (72), 18 states have call successors, (22), 1 states have call predecessors, (22), 9 states have return successors, (25), 10 states have call predecessors, (25), 18 states have call successors, (25) Word has length 79 [2022-11-23 15:15:10,675 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 15:15:10,677 INFO L225 Difference]: With dead ends: 204 [2022-11-23 15:15:10,678 INFO L226 Difference]: Without dead ends: 115 [2022-11-23 15:15:10,680 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 190 GetRequests, 147 SyntacticMatches, 5 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 252 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=263, Invalid=1297, Unknown=0, NotChecked=0, Total=1560 [2022-11-23 15:15:10,681 INFO L413 NwaCegarLoop]: 35 mSDtfsCounter, 106 mSDsluCounter, 210 mSDsCounter, 0 mSdLazyCounter, 702 mSolverCounterSat, 134 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 107 SdHoareTripleChecker+Valid, 245 SdHoareTripleChecker+Invalid, 836 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 134 IncrementalHoareTripleChecker+Valid, 702 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-11-23 15:15:10,681 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [107 Valid, 245 Invalid, 836 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [134 Valid, 702 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-11-23 15:15:10,682 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 115 states. [2022-11-23 15:15:10,700 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 115 to 98. [2022-11-23 15:15:10,700 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 98 states, 64 states have (on average 1.171875) internal successors, (75), 66 states have internal predecessors, (75), 19 states have call successors, (19), 8 states have call predecessors, (19), 14 states have return successors, (50), 23 states have call predecessors, (50), 19 states have call successors, (50) [2022-11-23 15:15:10,702 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 144 transitions. [2022-11-23 15:15:10,702 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 144 transitions. Word has length 79 [2022-11-23 15:15:10,702 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 15:15:10,702 INFO L495 AbstractCegarLoop]: Abstraction has 98 states and 144 transitions. [2022-11-23 15:15:10,703 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 21 states have (on average 3.4285714285714284) internal successors, (72), 23 states have internal predecessors, (72), 18 states have call successors, (22), 1 states have call predecessors, (22), 9 states have return successors, (25), 10 states have call predecessors, (25), 18 states have call successors, (25) [2022-11-23 15:15:10,703 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 144 transitions. [2022-11-23 15:15:10,707 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 143 [2022-11-23 15:15:10,708 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 15:15:10,708 INFO L195 NwaCegarLoop]: trace histogram [12, 12, 9, 9, 7, 6, 6, 6, 6, 6, 6, 6, 6, 6, 4, 4, 4, 4, 4, 4, 4, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 15:15:10,729 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb574073-9495-45bc-a341-0cb647c55fc4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-11-23 15:15:10,914 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb574073-9495-45bc-a341-0cb647c55fc4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:15:10,914 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 15:15:10,915 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 15:15:10,915 INFO L85 PathProgramCache]: Analyzing trace with hash 1596421381, now seen corresponding path program 1 times [2022-11-23 15:15:10,915 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 15:15:10,915 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1387760806] [2022-11-23 15:15:10,915 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:15:10,915 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 15:15:10,946 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:15:11,064 INFO L134 CoverageAnalysis]: Checked inductivity of 528 backedges. 39 proven. 116 refuted. 0 times theorem prover too weak. 373 trivial. 0 not checked. [2022-11-23 15:15:11,065 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 15:15:11,065 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1387760806] [2022-11-23 15:15:11,065 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1387760806] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 15:15:11,065 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2049929353] [2022-11-23 15:15:11,065 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:15:11,066 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:15:11,066 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb574073-9495-45bc-a341-0cb647c55fc4/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 15:15:11,067 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb574073-9495-45bc-a341-0cb647c55fc4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 15:15:11,093 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb574073-9495-45bc-a341-0cb647c55fc4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-11-23 15:15:11,186 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:15:11,188 INFO L263 TraceCheckSpWp]: Trace formula consists of 341 conjuncts, 14 conjunts are in the unsatisfiable core [2022-11-23 15:15:11,193 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 15:15:11,382 INFO L134 CoverageAnalysis]: Checked inductivity of 528 backedges. 29 proven. 202 refuted. 0 times theorem prover too weak. 297 trivial. 0 not checked. [2022-11-23 15:15:11,382 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 15:15:12,987 INFO L134 CoverageAnalysis]: Checked inductivity of 528 backedges. 29 proven. 216 refuted. 0 times theorem prover too weak. 283 trivial. 0 not checked. [2022-11-23 15:15:12,987 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2049929353] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 15:15:12,987 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [124342820] [2022-11-23 15:15:12,990 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2022-11-23 15:15:12,990 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 15:15:12,991 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:336) 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) [2022-11-23 15:15:12,992 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 15:15:12,992 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 11, 15] total 20 [2022-11-23 15:15:12,992 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1378281551] [2022-11-23 15:15:12,993 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 15:15:12,994 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2022-11-23 15:15:12,994 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 15:15:12,994 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2022-11-23 15:15:12,995 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=64, Invalid=316, Unknown=0, NotChecked=0, Total=380 [2022-11-23 15:15:12,995 INFO L87 Difference]: Start difference. First operand 98 states and 144 transitions. Second operand has 20 states, 17 states have (on average 4.117647058823529) internal successors, (70), 20 states have internal predecessors, (70), 17 states have call successors, (22), 1 states have call predecessors, (22), 8 states have return successors, (27), 7 states have call predecessors, (27), 17 states have call successors, (27) [2022-11-23 15:15:13,371 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 15:15:13,371 INFO L93 Difference]: Finished difference Result 191 states and 315 transitions. [2022-11-23 15:15:13,371 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-11-23 15:15:13,372 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 17 states have (on average 4.117647058823529) internal successors, (70), 20 states have internal predecessors, (70), 17 states have call successors, (22), 1 states have call predecessors, (22), 8 states have return successors, (27), 7 states have call predecessors, (27), 17 states have call successors, (27) Word has length 142 [2022-11-23 15:15:13,372 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 15:15:13,373 INFO L225 Difference]: With dead ends: 191 [2022-11-23 15:15:13,374 INFO L226 Difference]: Without dead ends: 103 [2022-11-23 15:15:13,375 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 298 GetRequests, 265 SyntacticMatches, 6 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 138 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=152, Invalid=660, Unknown=0, NotChecked=0, Total=812 [2022-11-23 15:15:13,376 INFO L413 NwaCegarLoop]: 18 mSDtfsCounter, 53 mSDsluCounter, 117 mSDsCounter, 0 mSdLazyCounter, 272 mSolverCounterSat, 46 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 61 SdHoareTripleChecker+Valid, 135 SdHoareTripleChecker+Invalid, 318 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 46 IncrementalHoareTripleChecker+Valid, 272 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-23 15:15:13,376 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [61 Valid, 135 Invalid, 318 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [46 Valid, 272 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-23 15:15:13,377 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2022-11-23 15:15:13,392 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 100. [2022-11-23 15:15:13,393 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 100 states, 65 states have (on average 1.1692307692307693) internal successors, (76), 68 states have internal predecessors, (76), 19 states have call successors, (19), 8 states have call predecessors, (19), 15 states have return successors, (48), 23 states have call predecessors, (48), 19 states have call successors, (48) [2022-11-23 15:15:13,394 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 143 transitions. [2022-11-23 15:15:13,395 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 143 transitions. Word has length 142 [2022-11-23 15:15:13,395 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 15:15:13,395 INFO L495 AbstractCegarLoop]: Abstraction has 100 states and 143 transitions. [2022-11-23 15:15:13,396 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 17 states have (on average 4.117647058823529) internal successors, (70), 20 states have internal predecessors, (70), 17 states have call successors, (22), 1 states have call predecessors, (22), 8 states have return successors, (27), 7 states have call predecessors, (27), 17 states have call successors, (27) [2022-11-23 15:15:13,396 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 143 transitions. [2022-11-23 15:15:13,400 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 160 [2022-11-23 15:15:13,400 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 15:15:13,401 INFO L195 NwaCegarLoop]: trace histogram [12, 12, 11, 11, 10, 8, 6, 6, 6, 6, 6, 6, 6, 5, 5, 5, 5, 5, 5, 5, 5, 3, 2, 2, 1, 1, 1, 1, 1, 1] [2022-11-23 15:15:13,420 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb574073-9495-45bc-a341-0cb647c55fc4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-11-23 15:15:13,608 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb574073-9495-45bc-a341-0cb647c55fc4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:15:13,608 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 15:15:13,608 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 15:15:13,609 INFO L85 PathProgramCache]: Analyzing trace with hash 1303291698, now seen corresponding path program 2 times [2022-11-23 15:15:13,609 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 15:15:13,609 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [746879023] [2022-11-23 15:15:13,609 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:15:13,609 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 15:15:13,641 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:15:13,927 INFO L134 CoverageAnalysis]: Checked inductivity of 657 backedges. 47 proven. 183 refuted. 0 times theorem prover too weak. 427 trivial. 0 not checked. [2022-11-23 15:15:13,927 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 15:15:13,927 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [746879023] [2022-11-23 15:15:13,927 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [746879023] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 15:15:13,927 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [882503913] [2022-11-23 15:15:13,928 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-23 15:15:13,928 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:15:13,928 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb574073-9495-45bc-a341-0cb647c55fc4/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 15:15:13,932 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb574073-9495-45bc-a341-0cb647c55fc4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 15:15:13,955 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb574073-9495-45bc-a341-0cb647c55fc4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-11-23 15:15:14,069 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2022-11-23 15:15:14,070 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 15:15:14,071 INFO L263 TraceCheckSpWp]: Trace formula consists of 198 conjuncts, 10 conjunts are in the unsatisfiable core [2022-11-23 15:15:14,080 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 15:15:14,181 INFO L134 CoverageAnalysis]: Checked inductivity of 657 backedges. 160 proven. 37 refuted. 0 times theorem prover too weak. 460 trivial. 0 not checked. [2022-11-23 15:15:14,181 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 15:15:15,036 INFO L134 CoverageAnalysis]: Checked inductivity of 657 backedges. 162 proven. 40 refuted. 0 times theorem prover too weak. 455 trivial. 0 not checked. [2022-11-23 15:15:15,036 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [882503913] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 15:15:15,036 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [36579563] [2022-11-23 15:15:15,043 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2022-11-23 15:15:15,044 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 15:15:15,044 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:336) 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) [2022-11-23 15:15:15,044 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 15:15:15,045 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9, 11] total 18 [2022-11-23 15:15:15,045 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [973557339] [2022-11-23 15:15:15,045 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 15:15:15,046 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2022-11-23 15:15:15,046 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 15:15:15,046 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2022-11-23 15:15:15,046 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=244, Unknown=0, NotChecked=0, Total=306 [2022-11-23 15:15:15,047 INFO L87 Difference]: Start difference. First operand 100 states and 143 transitions. Second operand has 18 states, 16 states have (on average 3.9375) internal successors, (63), 18 states have internal predecessors, (63), 12 states have call successors, (19), 1 states have call predecessors, (19), 9 states have return successors, (25), 12 states have call predecessors, (25), 12 states have call successors, (25) [2022-11-23 15:15:15,365 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 15:15:15,365 INFO L93 Difference]: Finished difference Result 140 states and 225 transitions. [2022-11-23 15:15:15,366 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-11-23 15:15:15,366 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 16 states have (on average 3.9375) internal successors, (63), 18 states have internal predecessors, (63), 12 states have call successors, (19), 1 states have call predecessors, (19), 9 states have return successors, (25), 12 states have call predecessors, (25), 12 states have call successors, (25) Word has length 159 [2022-11-23 15:15:15,367 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 15:15:15,368 INFO L225 Difference]: With dead ends: 140 [2022-11-23 15:15:15,368 INFO L226 Difference]: Without dead ends: 123 [2022-11-23 15:15:15,369 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 337 GetRequests, 309 SyntacticMatches, 4 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 128 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=136, Invalid=514, Unknown=0, NotChecked=0, Total=650 [2022-11-23 15:15:15,370 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 53 mSDsluCounter, 100 mSDsCounter, 0 mSdLazyCounter, 235 mSolverCounterSat, 53 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 61 SdHoareTripleChecker+Valid, 116 SdHoareTripleChecker+Invalid, 288 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 53 IncrementalHoareTripleChecker+Valid, 235 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-23 15:15:15,370 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [61 Valid, 116 Invalid, 288 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [53 Valid, 235 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-23 15:15:15,370 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 123 states. [2022-11-23 15:15:15,412 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 123 to 110. [2022-11-23 15:15:15,413 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 110 states, 71 states have (on average 1.1549295774647887) internal successors, (82), 74 states have internal predecessors, (82), 21 states have call successors, (21), 8 states have call predecessors, (21), 17 states have return successors, (58), 27 states have call predecessors, (58), 21 states have call successors, (58) [2022-11-23 15:15:15,416 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 110 states to 110 states and 161 transitions. [2022-11-23 15:15:15,416 INFO L78 Accepts]: Start accepts. Automaton has 110 states and 161 transitions. Word has length 159 [2022-11-23 15:15:15,419 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 15:15:15,419 INFO L495 AbstractCegarLoop]: Abstraction has 110 states and 161 transitions. [2022-11-23 15:15:15,420 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 16 states have (on average 3.9375) internal successors, (63), 18 states have internal predecessors, (63), 12 states have call successors, (19), 1 states have call predecessors, (19), 9 states have return successors, (25), 12 states have call predecessors, (25), 12 states have call successors, (25) [2022-11-23 15:15:15,420 INFO L276 IsEmpty]: Start isEmpty. Operand 110 states and 161 transitions. [2022-11-23 15:15:15,426 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 241 [2022-11-23 15:15:15,429 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 15:15:15,430 INFO L195 NwaCegarLoop]: trace histogram [18, 18, 17, 17, 14, 13, 9, 9, 9, 9, 9, 9, 9, 8, 8, 8, 8, 8, 8, 8, 6, 4, 4, 4, 1, 1, 1, 1, 1, 1] [2022-11-23 15:15:15,441 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb574073-9495-45bc-a341-0cb647c55fc4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2022-11-23 15:15:15,635 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb574073-9495-45bc-a341-0cb647c55fc4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:15:15,636 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 15:15:15,636 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 15:15:15,636 INFO L85 PathProgramCache]: Analyzing trace with hash 994120084, now seen corresponding path program 3 times [2022-11-23 15:15:15,637 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 15:15:15,637 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1950739095] [2022-11-23 15:15:15,637 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:15:15,637 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 15:15:15,703 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:15:16,100 INFO L134 CoverageAnalysis]: Checked inductivity of 1581 backedges. 62 proven. 406 refuted. 0 times theorem prover too weak. 1113 trivial. 0 not checked. [2022-11-23 15:15:16,101 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 15:15:16,101 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1950739095] [2022-11-23 15:15:16,101 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1950739095] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 15:15:16,101 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1464561871] [2022-11-23 15:15:16,101 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-23 15:15:16,102 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:15:16,102 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb574073-9495-45bc-a341-0cb647c55fc4/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 15:15:16,103 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb574073-9495-45bc-a341-0cb647c55fc4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 15:15:16,131 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb574073-9495-45bc-a341-0cb647c55fc4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-11-23 15:15:16,267 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-23 15:15:16,267 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 15:15:16,269 INFO L263 TraceCheckSpWp]: Trace formula consists of 426 conjuncts, 18 conjunts are in the unsatisfiable core [2022-11-23 15:15:16,277 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 15:15:16,490 INFO L134 CoverageAnalysis]: Checked inductivity of 1581 backedges. 927 proven. 132 refuted. 0 times theorem prover too weak. 522 trivial. 0 not checked. [2022-11-23 15:15:16,490 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 15:15:18,767 INFO L134 CoverageAnalysis]: Checked inductivity of 1581 backedges. 150 proven. 531 refuted. 0 times theorem prover too weak. 900 trivial. 0 not checked. [2022-11-23 15:15:18,767 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1464561871] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 15:15:18,767 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [34421726] [2022-11-23 15:15:18,770 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2022-11-23 15:15:18,770 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 15:15:18,770 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:336) 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) [2022-11-23 15:15:18,770 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 15:15:18,771 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15, 19] total 26 [2022-11-23 15:15:18,771 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1197863308] [2022-11-23 15:15:18,771 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 15:15:18,772 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2022-11-23 15:15:18,772 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 15:15:18,773 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2022-11-23 15:15:18,773 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=573, Unknown=0, NotChecked=0, Total=650 [2022-11-23 15:15:18,773 INFO L87 Difference]: Start difference. First operand 110 states and 161 transitions. Second operand has 26 states, 25 states have (on average 4.08) internal successors, (102), 26 states have internal predecessors, (102), 22 states have call successors, (30), 2 states have call predecessors, (30), 12 states have return successors, (36), 11 states have call predecessors, (36), 22 states have call successors, (36) [2022-11-23 15:15:20,024 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 15:15:20,024 INFO L93 Difference]: Finished difference Result 271 states and 523 transitions. [2022-11-23 15:15:20,024 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2022-11-23 15:15:20,025 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 25 states have (on average 4.08) internal successors, (102), 26 states have internal predecessors, (102), 22 states have call successors, (30), 2 states have call predecessors, (30), 12 states have return successors, (36), 11 states have call predecessors, (36), 22 states have call successors, (36) Word has length 240 [2022-11-23 15:15:20,026 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 15:15:20,028 INFO L225 Difference]: With dead ends: 271 [2022-11-23 15:15:20,028 INFO L226 Difference]: Without dead ends: 153 [2022-11-23 15:15:20,030 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 514 GetRequests, 460 SyntacticMatches, 9 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 383 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=355, Invalid=1807, Unknown=0, NotChecked=0, Total=2162 [2022-11-23 15:15:20,031 INFO L413 NwaCegarLoop]: 25 mSDtfsCounter, 151 mSDsluCounter, 211 mSDsCounter, 0 mSdLazyCounter, 841 mSolverCounterSat, 194 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 152 SdHoareTripleChecker+Valid, 236 SdHoareTripleChecker+Invalid, 1035 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 194 IncrementalHoareTripleChecker+Valid, 841 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-11-23 15:15:20,032 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [152 Valid, 236 Invalid, 1035 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [194 Valid, 841 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-11-23 15:15:20,032 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 153 states. [2022-11-23 15:15:20,049 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 153 to 138. [2022-11-23 15:15:20,050 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 138 states, 93 states have (on average 1.1505376344086022) internal successors, (107), 92 states have internal predecessors, (107), 26 states have call successors, (26), 15 states have call predecessors, (26), 18 states have return successors, (74), 30 states have call predecessors, (74), 26 states have call successors, (74) [2022-11-23 15:15:20,051 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 138 states to 138 states and 207 transitions. [2022-11-23 15:15:20,052 INFO L78 Accepts]: Start accepts. Automaton has 138 states and 207 transitions. Word has length 240 [2022-11-23 15:15:20,052 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 15:15:20,052 INFO L495 AbstractCegarLoop]: Abstraction has 138 states and 207 transitions. [2022-11-23 15:15:20,053 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 25 states have (on average 4.08) internal successors, (102), 26 states have internal predecessors, (102), 22 states have call successors, (30), 2 states have call predecessors, (30), 12 states have return successors, (36), 11 states have call predecessors, (36), 22 states have call successors, (36) [2022-11-23 15:15:20,053 INFO L276 IsEmpty]: Start isEmpty. Operand 138 states and 207 transitions. [2022-11-23 15:15:20,060 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 321 [2022-11-23 15:15:20,060 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 15:15:20,060 INFO L195 NwaCegarLoop]: trace histogram [25, 25, 22, 22, 18, 17, 12, 12, 12, 12, 12, 12, 12, 11, 11, 11, 11, 11, 11, 11, 8, 6, 6, 4, 1, 1, 1, 1, 1, 1] [2022-11-23 15:15:20,081 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb574073-9495-45bc-a341-0cb647c55fc4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2022-11-23 15:15:20,268 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb574073-9495-45bc-a341-0cb647c55fc4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2022-11-23 15:15:20,268 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 15:15:20,269 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 15:15:20,269 INFO L85 PathProgramCache]: Analyzing trace with hash -276109964, now seen corresponding path program 4 times [2022-11-23 15:15:20,269 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 15:15:20,270 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [486993714] [2022-11-23 15:15:20,270 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:15:20,270 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 15:15:20,361 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:15:20,998 INFO L134 CoverageAnalysis]: Checked inductivity of 2897 backedges. 96 proven. 664 refuted. 0 times theorem prover too weak. 2137 trivial. 0 not checked. [2022-11-23 15:15:20,998 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 15:15:20,999 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [486993714] [2022-11-23 15:15:21,000 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [486993714] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 15:15:21,000 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [812454891] [2022-11-23 15:15:21,000 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-23 15:15:21,000 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:15:21,000 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb574073-9495-45bc-a341-0cb647c55fc4/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 15:15:21,001 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb574073-9495-45bc-a341-0cb647c55fc4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 15:15:21,027 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb574073-9495-45bc-a341-0cb647c55fc4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-11-23 15:15:21,260 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:15:21,264 INFO L263 TraceCheckSpWp]: Trace formula consists of 736 conjuncts, 16 conjunts are in the unsatisfiable core [2022-11-23 15:15:21,270 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 15:15:21,398 INFO L134 CoverageAnalysis]: Checked inductivity of 2897 backedges. 96 proven. 664 refuted. 0 times theorem prover too weak. 2137 trivial. 0 not checked. [2022-11-23 15:15:21,398 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 15:15:24,114 INFO L134 CoverageAnalysis]: Checked inductivity of 2897 backedges. 96 proven. 688 refuted. 0 times theorem prover too weak. 2113 trivial. 0 not checked. [2022-11-23 15:15:24,114 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [812454891] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 15:15:24,114 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [778389525] [2022-11-23 15:15:24,118 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2022-11-23 15:15:24,119 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 15:15:24,119 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:336) 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) [2022-11-23 15:15:24,120 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 15:15:24,120 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 17] total 20 [2022-11-23 15:15:24,121 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [384344822] [2022-11-23 15:15:24,121 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 15:15:24,122 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2022-11-23 15:15:24,122 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 15:15:24,123 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2022-11-23 15:15:24,123 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=310, Unknown=0, NotChecked=0, Total=380 [2022-11-23 15:15:24,123 INFO L87 Difference]: Start difference. First operand 138 states and 207 transitions. Second operand has 20 states, 18 states have (on average 3.7777777777777777) internal successors, (68), 20 states have internal predecessors, (68), 17 states have call successors, (20), 1 states have call predecessors, (20), 8 states have return successors, (24), 8 states have call predecessors, (24), 17 states have call successors, (24) [2022-11-23 15:15:24,458 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 15:15:24,459 INFO L93 Difference]: Finished difference Result 165 states and 266 transitions. [2022-11-23 15:15:24,459 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-11-23 15:15:24,459 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 18 states have (on average 3.7777777777777777) internal successors, (68), 20 states have internal predecessors, (68), 17 states have call successors, (20), 1 states have call predecessors, (20), 8 states have return successors, (24), 8 states have call predecessors, (24), 17 states have call successors, (24) Word has length 320 [2022-11-23 15:15:24,460 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 15:15:24,462 INFO L225 Difference]: With dead ends: 165 [2022-11-23 15:15:24,462 INFO L226 Difference]: Without dead ends: 151 [2022-11-23 15:15:24,463 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 662 GetRequests, 630 SyntacticMatches, 7 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 142 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=141, Invalid=561, Unknown=0, NotChecked=0, Total=702 [2022-11-23 15:15:24,464 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 102 mSDsluCounter, 93 mSDsCounter, 0 mSdLazyCounter, 235 mSolverCounterSat, 97 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 119 SdHoareTripleChecker+Valid, 109 SdHoareTripleChecker+Invalid, 332 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 97 IncrementalHoareTripleChecker+Valid, 235 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-23 15:15:24,464 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [119 Valid, 109 Invalid, 332 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [97 Valid, 235 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-23 15:15:24,465 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 151 states. [2022-11-23 15:15:24,478 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 151 to 141. [2022-11-23 15:15:24,478 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 141 states, 95 states have (on average 1.1473684210526316) internal successors, (109), 94 states have internal predecessors, (109), 26 states have call successors, (26), 15 states have call predecessors, (26), 19 states have return successors, (75), 31 states have call predecessors, (75), 26 states have call successors, (75) [2022-11-23 15:15:24,480 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 141 states to 141 states and 210 transitions. [2022-11-23 15:15:24,481 INFO L78 Accepts]: Start accepts. Automaton has 141 states and 210 transitions. Word has length 320 [2022-11-23 15:15:24,481 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 15:15:24,481 INFO L495 AbstractCegarLoop]: Abstraction has 141 states and 210 transitions. [2022-11-23 15:15:24,482 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 18 states have (on average 3.7777777777777777) internal successors, (68), 20 states have internal predecessors, (68), 17 states have call successors, (20), 1 states have call predecessors, (20), 8 states have return successors, (24), 8 states have call predecessors, (24), 17 states have call successors, (24) [2022-11-23 15:15:24,482 INFO L276 IsEmpty]: Start isEmpty. Operand 141 states and 210 transitions. [2022-11-23 15:15:24,488 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 364 [2022-11-23 15:15:24,488 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 15:15:24,489 INFO L195 NwaCegarLoop]: trace histogram [27, 27, 26, 26, 22, 20, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 9, 7, 6, 5, 1, 1, 1, 1, 1, 1] [2022-11-23 15:15:24,507 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb574073-9495-45bc-a341-0cb647c55fc4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2022-11-23 15:15:24,705 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb574073-9495-45bc-a341-0cb647c55fc4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2022-11-23 15:15:24,705 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 15:15:24,705 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 15:15:24,705 INFO L85 PathProgramCache]: Analyzing trace with hash -1215508947, now seen corresponding path program 5 times [2022-11-23 15:15:24,706 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 15:15:24,706 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [852608802] [2022-11-23 15:15:24,706 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:15:24,706 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 15:15:24,792 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:15:25,348 INFO L134 CoverageAnalysis]: Checked inductivity of 3749 backedges. 182 proven. 581 refuted. 0 times theorem prover too weak. 2986 trivial. 0 not checked. [2022-11-23 15:15:25,349 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 15:15:25,349 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [852608802] [2022-11-23 15:15:25,349 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [852608802] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 15:15:25,349 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [556021970] [2022-11-23 15:15:25,349 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-23 15:15:25,349 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:15:25,350 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb574073-9495-45bc-a341-0cb647c55fc4/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 15:15:25,352 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb574073-9495-45bc-a341-0cb647c55fc4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 15:15:25,386 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb574073-9495-45bc-a341-0cb647c55fc4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-11-23 15:15:25,570 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2022-11-23 15:15:25,571 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 15:15:25,573 INFO L263 TraceCheckSpWp]: Trace formula consists of 377 conjuncts, 12 conjunts are in the unsatisfiable core [2022-11-23 15:15:25,579 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 15:15:25,745 INFO L134 CoverageAnalysis]: Checked inductivity of 3749 backedges. 1681 proven. 33 refuted. 0 times theorem prover too weak. 2035 trivial. 0 not checked. [2022-11-23 15:15:25,745 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 15:15:27,658 INFO L134 CoverageAnalysis]: Checked inductivity of 3749 backedges. 650 proven. 162 refuted. 0 times theorem prover too weak. 2937 trivial. 0 not checked. [2022-11-23 15:15:27,658 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [556021970] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 15:15:27,658 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [559458093] [2022-11-23 15:15:27,660 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2022-11-23 15:15:27,660 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 15:15:27,661 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:336) 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) [2022-11-23 15:15:27,661 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 15:15:27,661 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 12, 13] total 24 [2022-11-23 15:15:27,661 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [665277302] [2022-11-23 15:15:27,662 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 15:15:27,663 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2022-11-23 15:15:27,663 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 15:15:27,663 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2022-11-23 15:15:27,663 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=481, Unknown=0, NotChecked=0, Total=552 [2022-11-23 15:15:27,665 INFO L87 Difference]: Start difference. First operand 141 states and 210 transitions. Second operand has 24 states, 23 states have (on average 4.173913043478261) internal successors, (96), 24 states have internal predecessors, (96), 17 states have call successors, (28), 2 states have call predecessors, (28), 13 states have return successors, (35), 14 states have call predecessors, (35), 17 states have call successors, (35) [2022-11-23 15:15:28,842 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 15:15:28,842 INFO L93 Difference]: Finished difference Result 352 states and 630 transitions. [2022-11-23 15:15:28,843 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2022-11-23 15:15:28,843 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 23 states have (on average 4.173913043478261) internal successors, (96), 24 states have internal predecessors, (96), 17 states have call successors, (28), 2 states have call predecessors, (28), 13 states have return successors, (35), 14 states have call predecessors, (35), 17 states have call successors, (35) Word has length 363 [2022-11-23 15:15:28,844 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 15:15:28,847 INFO L225 Difference]: With dead ends: 352 [2022-11-23 15:15:28,848 INFO L226 Difference]: Without dead ends: 215 [2022-11-23 15:15:28,850 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 763 GetRequests, 711 SyntacticMatches, 6 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 458 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=356, Invalid=1900, Unknown=0, NotChecked=0, Total=2256 [2022-11-23 15:15:28,851 INFO L413 NwaCegarLoop]: 27 mSDtfsCounter, 122 mSDsluCounter, 164 mSDsCounter, 0 mSdLazyCounter, 774 mSolverCounterSat, 179 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 123 SdHoareTripleChecker+Valid, 191 SdHoareTripleChecker+Invalid, 953 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 179 IncrementalHoareTripleChecker+Valid, 774 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-11-23 15:15:28,851 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [123 Valid, 191 Invalid, 953 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [179 Valid, 774 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-11-23 15:15:28,852 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 215 states. [2022-11-23 15:15:28,872 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 215 to 181. [2022-11-23 15:15:28,873 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 181 states, 123 states have (on average 1.1626016260162602) internal successors, (143), 121 states have internal predecessors, (143), 36 states have call successors, (36), 22 states have call predecessors, (36), 21 states have return successors, (123), 37 states have call predecessors, (123), 36 states have call successors, (123) [2022-11-23 15:15:28,875 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 181 states to 181 states and 302 transitions. [2022-11-23 15:15:28,876 INFO L78 Accepts]: Start accepts. Automaton has 181 states and 302 transitions. Word has length 363 [2022-11-23 15:15:28,876 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 15:15:28,877 INFO L495 AbstractCegarLoop]: Abstraction has 181 states and 302 transitions. [2022-11-23 15:15:28,877 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 23 states have (on average 4.173913043478261) internal successors, (96), 24 states have internal predecessors, (96), 17 states have call successors, (28), 2 states have call predecessors, (28), 13 states have return successors, (35), 14 states have call predecessors, (35), 17 states have call successors, (35) [2022-11-23 15:15:28,877 INFO L276 IsEmpty]: Start isEmpty. Operand 181 states and 302 transitions. [2022-11-23 15:15:28,888 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 443 [2022-11-23 15:15:28,889 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 15:15:28,889 INFO L195 NwaCegarLoop]: trace histogram [33, 33, 32, 32, 25, 24, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 9, 9, 8, 7, 1, 1, 1, 1, 1, 1] [2022-11-23 15:15:28,896 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb574073-9495-45bc-a341-0cb647c55fc4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2022-11-23 15:15:29,096 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb574073-9495-45bc-a341-0cb647c55fc4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:15:29,096 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 15:15:29,097 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 15:15:29,097 INFO L85 PathProgramCache]: Analyzing trace with hash -771407987, now seen corresponding path program 6 times [2022-11-23 15:15:29,097 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 15:15:29,098 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [467246357] [2022-11-23 15:15:29,098 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:15:29,098 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 15:15:29,226 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:15:29,970 INFO L134 CoverageAnalysis]: Checked inductivity of 5632 backedges. 217 proven. 869 refuted. 0 times theorem prover too weak. 4546 trivial. 0 not checked. [2022-11-23 15:15:29,970 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 15:15:29,970 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [467246357] [2022-11-23 15:15:29,970 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [467246357] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 15:15:29,970 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [504109581] [2022-11-23 15:15:29,971 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-23 15:15:29,971 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:15:29,971 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb574073-9495-45bc-a341-0cb647c55fc4/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 15:15:29,982 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb574073-9495-45bc-a341-0cb647c55fc4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 15:15:30,012 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb574073-9495-45bc-a341-0cb647c55fc4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-11-23 15:15:30,281 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-23 15:15:30,281 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 15:15:30,285 INFO L263 TraceCheckSpWp]: Trace formula consists of 785 conjuncts, 8 conjunts are in the unsatisfiable core [2022-11-23 15:15:30,291 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 15:15:30,402 INFO L134 CoverageAnalysis]: Checked inductivity of 5632 backedges. 1138 proven. 6 refuted. 0 times theorem prover too weak. 4488 trivial. 0 not checked. [2022-11-23 15:15:30,402 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 15:15:32,214 INFO L134 CoverageAnalysis]: Checked inductivity of 5632 backedges. 242 proven. 712 refuted. 0 times theorem prover too weak. 4678 trivial. 0 not checked. [2022-11-23 15:15:32,214 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [504109581] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 15:15:32,214 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1108581552] [2022-11-23 15:15:32,217 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2022-11-23 15:15:32,217 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 15:15:32,218 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:336) 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) [2022-11-23 15:15:32,219 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 15:15:32,219 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 9, 9] total 20 [2022-11-23 15:15:32,220 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1846038329] [2022-11-23 15:15:32,220 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 15:15:32,221 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2022-11-23 15:15:32,221 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 15:15:32,222 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2022-11-23 15:15:32,222 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=328, Unknown=0, NotChecked=0, Total=380 [2022-11-23 15:15:32,222 INFO L87 Difference]: Start difference. First operand 181 states and 302 transitions. Second operand has 20 states, 19 states have (on average 4.2631578947368425) internal successors, (81), 20 states have internal predecessors, (81), 14 states have call successors, (24), 2 states have call predecessors, (24), 11 states have return successors, (31), 11 states have call predecessors, (31), 14 states have call successors, (31) [2022-11-23 15:15:33,106 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 15:15:33,106 INFO L93 Difference]: Finished difference Result 429 states and 867 transitions. [2022-11-23 15:15:33,107 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2022-11-23 15:15:33,108 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 19 states have (on average 4.2631578947368425) internal successors, (81), 20 states have internal predecessors, (81), 14 states have call successors, (24), 2 states have call predecessors, (24), 11 states have return successors, (31), 11 states have call predecessors, (31), 14 states have call successors, (31) Word has length 442 [2022-11-23 15:15:33,108 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 15:15:33,113 INFO L225 Difference]: With dead ends: 429 [2022-11-23 15:15:33,113 INFO L226 Difference]: Without dead ends: 262 [2022-11-23 15:15:33,115 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 918 GetRequests, 877 SyntacticMatches, 4 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 226 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=255, Invalid=1227, Unknown=0, NotChecked=0, Total=1482 [2022-11-23 15:15:33,116 INFO L413 NwaCegarLoop]: 24 mSDtfsCounter, 118 mSDsluCounter, 144 mSDsCounter, 0 mSdLazyCounter, 650 mSolverCounterSat, 122 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 119 SdHoareTripleChecker+Valid, 168 SdHoareTripleChecker+Invalid, 772 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 122 IncrementalHoareTripleChecker+Valid, 650 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-11-23 15:15:33,116 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [119 Valid, 168 Invalid, 772 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [122 Valid, 650 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-11-23 15:15:33,117 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 262 states. [2022-11-23 15:15:33,140 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 262 to 230. [2022-11-23 15:15:33,141 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 230 states, 158 states have (on average 1.1898734177215189) internal successors, (188), 154 states have internal predecessors, (188), 47 states have call successors, (47), 31 states have call predecessors, (47), 24 states have return successors, (165), 44 states have call predecessors, (165), 47 states have call successors, (165) [2022-11-23 15:15:33,144 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 230 states to 230 states and 400 transitions. [2022-11-23 15:15:33,144 INFO L78 Accepts]: Start accepts. Automaton has 230 states and 400 transitions. Word has length 442 [2022-11-23 15:15:33,144 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 15:15:33,145 INFO L495 AbstractCegarLoop]: Abstraction has 230 states and 400 transitions. [2022-11-23 15:15:33,145 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 19 states have (on average 4.2631578947368425) internal successors, (81), 20 states have internal predecessors, (81), 14 states have call successors, (24), 2 states have call predecessors, (24), 11 states have return successors, (31), 11 states have call predecessors, (31), 14 states have call successors, (31) [2022-11-23 15:15:33,145 INFO L276 IsEmpty]: Start isEmpty. Operand 230 states and 400 transitions. [2022-11-23 15:15:33,157 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 474 [2022-11-23 15:15:33,157 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 15:15:33,157 INFO L195 NwaCegarLoop]: trace histogram [36, 36, 33, 33, 28, 28, 18, 18, 18, 18, 18, 18, 18, 16, 16, 16, 16, 16, 16, 16, 12, 10, 8, 5, 1, 1, 1, 1, 1, 1] [2022-11-23 15:15:33,169 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb574073-9495-45bc-a341-0cb647c55fc4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2022-11-23 15:15:33,364 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb574073-9495-45bc-a341-0cb647c55fc4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:15:33,364 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 15:15:33,364 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 15:15:33,364 INFO L85 PathProgramCache]: Analyzing trace with hash 113490333, now seen corresponding path program 7 times [2022-11-23 15:15:33,365 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 15:15:33,365 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1502515652] [2022-11-23 15:15:33,365 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:15:33,365 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 15:15:33,445 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:15:34,109 INFO L134 CoverageAnalysis]: Checked inductivity of 6480 backedges. 297 proven. 736 refuted. 0 times theorem prover too weak. 5447 trivial. 0 not checked. [2022-11-23 15:15:34,110 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 15:15:34,110 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1502515652] [2022-11-23 15:15:34,110 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1502515652] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 15:15:34,110 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1740659917] [2022-11-23 15:15:34,110 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-23 15:15:34,111 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:15:34,111 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb574073-9495-45bc-a341-0cb647c55fc4/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 15:15:34,116 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb574073-9495-45bc-a341-0cb647c55fc4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 15:15:34,143 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb574073-9495-45bc-a341-0cb647c55fc4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2022-11-23 15:15:34,437 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:15:34,441 INFO L263 TraceCheckSpWp]: Trace formula consists of 1075 conjuncts, 18 conjunts are in the unsatisfiable core [2022-11-23 15:15:34,456 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 15:15:34,633 INFO L134 CoverageAnalysis]: Checked inductivity of 6480 backedges. 186 proven. 1169 refuted. 0 times theorem prover too weak. 5125 trivial. 0 not checked. [2022-11-23 15:15:34,634 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 15:15:37,970 INFO L134 CoverageAnalysis]: Checked inductivity of 6480 backedges. 186 proven. 1202 refuted. 0 times theorem prover too weak. 5092 trivial. 0 not checked. [2022-11-23 15:15:37,971 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1740659917] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 15:15:37,971 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1605997644] [2022-11-23 15:15:37,975 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2022-11-23 15:15:37,975 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 15:15:37,975 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:336) 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) [2022-11-23 15:15:37,976 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 15:15:37,977 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 13, 19] total 25 [2022-11-23 15:15:37,977 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1451802726] [2022-11-23 15:15:37,977 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 15:15:37,978 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2022-11-23 15:15:37,979 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 15:15:37,979 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2022-11-23 15:15:37,979 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=495, Unknown=0, NotChecked=0, Total=600 [2022-11-23 15:15:37,980 INFO L87 Difference]: Start difference. First operand 230 states and 400 transitions. Second operand has 25 states, 23 states have (on average 3.608695652173913) internal successors, (83), 25 states have internal predecessors, (83), 21 states have call successors, (25), 1 states have call predecessors, (25), 12 states have return successors, (34), 13 states have call predecessors, (34), 21 states have call successors, (34) [2022-11-23 15:15:38,526 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 15:15:38,526 INFO L93 Difference]: Finished difference Result 280 states and 543 transitions. [2022-11-23 15:15:38,526 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2022-11-23 15:15:38,527 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 23 states have (on average 3.608695652173913) internal successors, (83), 25 states have internal predecessors, (83), 21 states have call successors, (25), 1 states have call predecessors, (25), 12 states have return successors, (34), 13 states have call predecessors, (34), 21 states have call successors, (34) Word has length 473 [2022-11-23 15:15:38,530 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 15:15:38,536 INFO L225 Difference]: With dead ends: 280 [2022-11-23 15:15:38,536 INFO L226 Difference]: Without dead ends: 256 [2022-11-23 15:15:38,538 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 970 GetRequests, 928 SyntacticMatches, 8 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 352 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=243, Invalid=1017, Unknown=0, NotChecked=0, Total=1260 [2022-11-23 15:15:38,539 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 110 mSDsluCounter, 139 mSDsCounter, 0 mSdLazyCounter, 431 mSolverCounterSat, 132 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 124 SdHoareTripleChecker+Valid, 155 SdHoareTripleChecker+Invalid, 563 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 132 IncrementalHoareTripleChecker+Valid, 431 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-23 15:15:38,539 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [124 Valid, 155 Invalid, 563 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [132 Valid, 431 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-23 15:15:38,540 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 256 states. [2022-11-23 15:15:38,566 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 256 to 241. [2022-11-23 15:15:38,567 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 241 states, 165 states have (on average 1.1818181818181819) internal successors, (195), 161 states have internal predecessors, (195), 48 states have call successors, (48), 31 states have call predecessors, (48), 27 states have return successors, (175), 48 states have call predecessors, (175), 48 states have call successors, (175) [2022-11-23 15:15:38,570 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 241 states to 241 states and 418 transitions. [2022-11-23 15:15:38,570 INFO L78 Accepts]: Start accepts. Automaton has 241 states and 418 transitions. Word has length 473 [2022-11-23 15:15:38,571 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 15:15:38,571 INFO L495 AbstractCegarLoop]: Abstraction has 241 states and 418 transitions. [2022-11-23 15:15:38,571 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 23 states have (on average 3.608695652173913) internal successors, (83), 25 states have internal predecessors, (83), 21 states have call successors, (25), 1 states have call predecessors, (25), 12 states have return successors, (34), 13 states have call predecessors, (34), 21 states have call successors, (34) [2022-11-23 15:15:38,572 INFO L276 IsEmpty]: Start isEmpty. Operand 241 states and 418 transitions. [2022-11-23 15:15:38,581 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 863 [2022-11-23 15:15:38,581 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 15:15:38,582 INFO L195 NwaCegarLoop]: trace histogram [66, 66, 59, 59, 57, 52, 33, 33, 33, 33, 33, 33, 33, 29, 29, 29, 29, 29, 29, 29, 24, 23, 14, 2, 1, 1, 1, 1, 1, 1] [2022-11-23 15:15:38,594 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb574073-9495-45bc-a341-0cb647c55fc4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2022-11-23 15:15:38,794 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb574073-9495-45bc-a341-0cb647c55fc4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2022-11-23 15:15:38,795 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 15:15:38,795 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 15:15:38,795 INFO L85 PathProgramCache]: Analyzing trace with hash -2114434413, now seen corresponding path program 8 times [2022-11-23 15:15:38,795 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 15:15:38,795 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1971416002] [2022-11-23 15:15:38,796 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:15:38,796 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 15:15:38,998 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:15:40,450 INFO L134 CoverageAnalysis]: Checked inductivity of 22082 backedges. 486 proven. 1808 refuted. 0 times theorem prover too weak. 19788 trivial. 0 not checked. [2022-11-23 15:15:40,451 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 15:15:40,451 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1971416002] [2022-11-23 15:15:40,451 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1971416002] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 15:15:40,451 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1436653451] [2022-11-23 15:15:40,452 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-23 15:15:40,452 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:15:40,452 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb574073-9495-45bc-a341-0cb647c55fc4/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 15:15:40,453 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb574073-9495-45bc-a341-0cb647c55fc4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 15:15:40,487 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb574073-9495-45bc-a341-0cb647c55fc4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2022-11-23 15:15:40,781 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2022-11-23 15:15:40,782 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 15:15:40,784 INFO L263 TraceCheckSpWp]: Trace formula consists of 516 conjuncts, 8 conjunts are in the unsatisfiable core [2022-11-23 15:15:40,794 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 15:15:40,910 INFO L134 CoverageAnalysis]: Checked inductivity of 22082 backedges. 8066 proven. 4 refuted. 0 times theorem prover too weak. 14012 trivial. 0 not checked. [2022-11-23 15:15:40,910 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 15:15:43,535 INFO L134 CoverageAnalysis]: Checked inductivity of 22082 backedges. 1459 proven. 271 refuted. 0 times theorem prover too weak. 20352 trivial. 0 not checked. [2022-11-23 15:15:43,535 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1436653451] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 15:15:43,535 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1594211015] [2022-11-23 15:15:43,540 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2022-11-23 15:15:43,540 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 15:15:43,540 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:336) 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) [2022-11-23 15:15:43,541 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 15:15:43,542 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 9, 9] total 21 [2022-11-23 15:15:43,543 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [914248044] [2022-11-23 15:15:43,543 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 15:15:43,545 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2022-11-23 15:15:43,546 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 15:15:43,546 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2022-11-23 15:15:43,546 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=363, Unknown=0, NotChecked=0, Total=420 [2022-11-23 15:15:43,547 INFO L87 Difference]: Start difference. First operand 241 states and 418 transitions. Second operand has 21 states, 20 states have (on average 4.25) internal successors, (85), 21 states have internal predecessors, (85), 13 states have call successors, (25), 2 states have call predecessors, (25), 12 states have return successors, (34), 13 states have call predecessors, (34), 13 states have call successors, (34) [2022-11-23 15:15:44,370 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 15:15:44,370 INFO L93 Difference]: Finished difference Result 581 states and 1246 transitions. [2022-11-23 15:15:44,371 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2022-11-23 15:15:44,371 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 20 states have (on average 4.25) internal successors, (85), 21 states have internal predecessors, (85), 13 states have call successors, (25), 2 states have call predecessors, (25), 12 states have return successors, (34), 13 states have call predecessors, (34), 13 states have call successors, (34) Word has length 862 [2022-11-23 15:15:44,371 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 15:15:44,377 INFO L225 Difference]: With dead ends: 581 [2022-11-23 15:15:44,377 INFO L226 Difference]: Without dead ends: 343 [2022-11-23 15:15:44,381 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1760 GetRequests, 1716 SyntacticMatches, 4 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 299 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=279, Invalid=1443, Unknown=0, NotChecked=0, Total=1722 [2022-11-23 15:15:44,382 INFO L413 NwaCegarLoop]: 29 mSDtfsCounter, 133 mSDsluCounter, 158 mSDsCounter, 0 mSdLazyCounter, 625 mSolverCounterSat, 155 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 134 SdHoareTripleChecker+Valid, 187 SdHoareTripleChecker+Invalid, 780 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 155 IncrementalHoareTripleChecker+Valid, 625 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-23 15:15:44,382 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [134 Valid, 187 Invalid, 780 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [155 Valid, 625 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-23 15:15:44,383 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 343 states. [2022-11-23 15:15:44,409 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 343 to 282. [2022-11-23 15:15:44,410 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 282 states, 196 states have (on average 1.1887755102040816) internal successors, (233), 188 states have internal predecessors, (233), 57 states have call successors, (57), 41 states have call predecessors, (57), 28 states have return successors, (234), 52 states have call predecessors, (234), 57 states have call successors, (234) [2022-11-23 15:15:44,413 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 282 states to 282 states and 524 transitions. [2022-11-23 15:15:44,413 INFO L78 Accepts]: Start accepts. Automaton has 282 states and 524 transitions. Word has length 862 [2022-11-23 15:15:44,413 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 15:15:44,414 INFO L495 AbstractCegarLoop]: Abstraction has 282 states and 524 transitions. [2022-11-23 15:15:44,414 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 20 states have (on average 4.25) internal successors, (85), 21 states have internal predecessors, (85), 13 states have call successors, (25), 2 states have call predecessors, (25), 12 states have return successors, (34), 13 states have call predecessors, (34), 13 states have call successors, (34) [2022-11-23 15:15:44,414 INFO L276 IsEmpty]: Start isEmpty. Operand 282 states and 524 transitions. [2022-11-23 15:15:44,425 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 936 [2022-11-23 15:15:44,425 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 15:15:44,425 INFO L195 NwaCegarLoop]: trace histogram [72, 72, 65, 65, 55, 55, 36, 36, 36, 36, 36, 36, 36, 32, 32, 32, 32, 32, 32, 32, 23, 19, 17, 10, 1, 1, 1, 1, 1, 1] [2022-11-23 15:15:44,441 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb574073-9495-45bc-a341-0cb647c55fc4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Ended with exit code 0 [2022-11-23 15:15:44,631 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb574073-9495-45bc-a341-0cb647c55fc4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2022-11-23 15:15:44,632 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 15:15:44,632 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 15:15:44,632 INFO L85 PathProgramCache]: Analyzing trace with hash -1569471849, now seen corresponding path program 9 times [2022-11-23 15:15:44,632 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 15:15:44,632 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [103915823] [2022-11-23 15:15:44,633 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:15:44,633 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 15:15:44,849 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:15:46,842 INFO L134 CoverageAnalysis]: Checked inductivity of 26018 backedges. 604 proven. 2930 refuted. 0 times theorem prover too weak. 22484 trivial. 0 not checked. [2022-11-23 15:15:46,842 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 15:15:46,842 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [103915823] [2022-11-23 15:15:46,842 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [103915823] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 15:15:46,842 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [288072965] [2022-11-23 15:15:46,843 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-23 15:15:46,843 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:15:46,843 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb574073-9495-45bc-a341-0cb647c55fc4/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 15:15:46,844 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb574073-9495-45bc-a341-0cb647c55fc4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 15:15:46,879 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb574073-9495-45bc-a341-0cb647c55fc4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2022-11-23 15:15:47,271 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-23 15:15:47,272 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 15:15:47,277 INFO L263 TraceCheckSpWp]: Trace formula consists of 1663 conjuncts, 22 conjunts are in the unsatisfiable core [2022-11-23 15:15:47,287 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 15:15:47,485 INFO L134 CoverageAnalysis]: Checked inductivity of 26018 backedges. 10479 proven. 427 refuted. 0 times theorem prover too weak. 15112 trivial. 0 not checked. [2022-11-23 15:15:47,485 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 15:15:52,509 INFO L134 CoverageAnalysis]: Checked inductivity of 26018 backedges. 648 proven. 3455 refuted. 0 times theorem prover too weak. 21915 trivial. 0 not checked. [2022-11-23 15:15:52,509 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [288072965] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 15:15:52,510 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1805786102] [2022-11-23 15:15:52,511 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2022-11-23 15:15:52,512 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 15:15:52,512 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:336) 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) [2022-11-23 15:15:52,513 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 15:15:52,513 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 17, 23] total 31 [2022-11-23 15:15:52,514 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1494084380] [2022-11-23 15:15:52,514 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 15:15:52,515 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2022-11-23 15:15:52,516 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 15:15:52,516 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2022-11-23 15:15:52,516 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=116, Invalid=814, Unknown=0, NotChecked=0, Total=930 [2022-11-23 15:15:52,517 INFO L87 Difference]: Start difference. First operand 282 states and 524 transitions. Second operand has 31 states, 31 states have (on average 3.6774193548387095) internal successors, (114), 31 states have internal predecessors, (114), 24 states have call successors, (35), 2 states have call predecessors, (35), 13 states have return successors, (43), 13 states have call predecessors, (43), 24 states have call successors, (43) [2022-11-23 15:15:53,672 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 15:15:53,672 INFO L93 Difference]: Finished difference Result 577 states and 1163 transitions. [2022-11-23 15:15:53,672 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2022-11-23 15:15:53,673 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 3.6774193548387095) internal successors, (114), 31 states have internal predecessors, (114), 24 states have call successors, (35), 2 states have call predecessors, (35), 13 states have return successors, (43), 13 states have call predecessors, (43), 24 states have call successors, (43) Word has length 935 [2022-11-23 15:15:53,676 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 15:15:53,680 INFO L225 Difference]: With dead ends: 577 [2022-11-23 15:15:53,680 INFO L226 Difference]: Without dead ends: 298 [2022-11-23 15:15:53,684 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1912 GetRequests, 1849 SyntacticMatches, 11 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 696 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=456, Invalid=2406, Unknown=0, NotChecked=0, Total=2862 [2022-11-23 15:15:53,685 INFO L413 NwaCegarLoop]: 42 mSDtfsCounter, 104 mSDsluCounter, 400 mSDsCounter, 0 mSdLazyCounter, 1126 mSolverCounterSat, 124 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 104 SdHoareTripleChecker+Valid, 442 SdHoareTripleChecker+Invalid, 1250 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 124 IncrementalHoareTripleChecker+Valid, 1126 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-11-23 15:15:53,685 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [104 Valid, 442 Invalid, 1250 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [124 Valid, 1126 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-11-23 15:15:53,687 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 298 states. [2022-11-23 15:15:53,712 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 298 to 267. [2022-11-23 15:15:53,713 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 267 states, 188 states have (on average 1.1117021276595744) internal successors, (209), 181 states have internal predecessors, (209), 53 states have call successors, (53), 40 states have call predecessors, (53), 25 states have return successors, (159), 45 states have call predecessors, (159), 53 states have call successors, (159) [2022-11-23 15:15:53,716 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 267 states to 267 states and 421 transitions. [2022-11-23 15:15:53,717 INFO L78 Accepts]: Start accepts. Automaton has 267 states and 421 transitions. Word has length 935 [2022-11-23 15:15:53,718 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 15:15:53,718 INFO L495 AbstractCegarLoop]: Abstraction has 267 states and 421 transitions. [2022-11-23 15:15:53,718 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 31 states have (on average 3.6774193548387095) internal successors, (114), 31 states have internal predecessors, (114), 24 states have call successors, (35), 2 states have call predecessors, (35), 13 states have return successors, (43), 13 states have call predecessors, (43), 24 states have call successors, (43) [2022-11-23 15:15:53,718 INFO L276 IsEmpty]: Start isEmpty. Operand 267 states and 421 transitions. [2022-11-23 15:15:53,739 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1440 [2022-11-23 15:15:53,739 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 15:15:53,740 INFO L195 NwaCegarLoop]: trace histogram [108, 108, 103, 103, 87, 83, 54, 54, 54, 54, 54, 54, 54, 51, 51, 51, 51, 51, 51, 51, 33, 32, 25, 16, 1, 1, 1, 1, 1, 1] [2022-11-23 15:15:53,753 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb574073-9495-45bc-a341-0cb647c55fc4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2022-11-23 15:15:53,948 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15,15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb574073-9495-45bc-a341-0cb647c55fc4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:15:53,948 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 15:15:53,949 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 15:15:53,949 INFO L85 PathProgramCache]: Analyzing trace with hash 1858191710, now seen corresponding path program 10 times [2022-11-23 15:15:53,949 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 15:15:53,949 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1407708535] [2022-11-23 15:15:53,950 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:15:53,950 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 15:15:54,469 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:15:57,888 INFO L134 CoverageAnalysis]: Checked inductivity of 62092 backedges. 534 proven. 4530 refuted. 0 times theorem prover too weak. 57028 trivial. 0 not checked. [2022-11-23 15:15:57,888 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 15:15:57,888 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1407708535] [2022-11-23 15:15:57,888 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1407708535] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 15:15:57,889 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1602401433] [2022-11-23 15:15:57,889 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-23 15:15:57,889 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:15:57,889 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb574073-9495-45bc-a341-0cb647c55fc4/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 15:15:57,890 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb574073-9495-45bc-a341-0cb647c55fc4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 15:15:57,902 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb574073-9495-45bc-a341-0cb647c55fc4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2022-11-23 15:15:58,564 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:15:58,575 INFO L263 TraceCheckSpWp]: Trace formula consists of 3220 conjuncts, 20 conjunts are in the unsatisfiable core [2022-11-23 15:15:58,596 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 15:15:58,743 INFO L134 CoverageAnalysis]: Checked inductivity of 62092 backedges. 534 proven. 4530 refuted. 0 times theorem prover too weak. 57028 trivial. 0 not checked. [2022-11-23 15:15:58,744 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 15:16:04,761 INFO L134 CoverageAnalysis]: Checked inductivity of 62092 backedges. 534 proven. 4574 refuted. 0 times theorem prover too weak. 56984 trivial. 0 not checked. [2022-11-23 15:16:04,762 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1602401433] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 15:16:04,762 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [502477809] [2022-11-23 15:16:04,764 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2022-11-23 15:16:04,764 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 15:16:04,765 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:336) 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) [2022-11-23 15:16:04,766 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 15:16:04,766 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 21] total 24 [2022-11-23 15:16:04,767 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [127851628] [2022-11-23 15:16:04,767 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 15:16:04,769 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2022-11-23 15:16:04,769 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 15:16:04,769 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2022-11-23 15:16:04,770 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=456, Unknown=0, NotChecked=0, Total=552 [2022-11-23 15:16:04,770 INFO L87 Difference]: Start difference. First operand 267 states and 421 transitions. Second operand has 24 states, 22 states have (on average 3.6363636363636362) internal successors, (80), 24 states have internal predecessors, (80), 21 states have call successors, (24), 1 states have call predecessors, (24), 10 states have return successors, (30), 10 states have call predecessors, (30), 21 states have call successors, (30) [2022-11-23 15:16:05,118 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 15:16:05,118 INFO L93 Difference]: Finished difference Result 294 states and 483 transitions. [2022-11-23 15:16:05,118 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-11-23 15:16:05,119 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 22 states have (on average 3.6363636363636362) internal successors, (80), 24 states have internal predecessors, (80), 21 states have call successors, (24), 1 states have call predecessors, (24), 10 states have return successors, (30), 10 states have call predecessors, (30), 21 states have call successors, (30) Word has length 1439 [2022-11-23 15:16:05,124 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 15:16:05,127 INFO L225 Difference]: With dead ends: 294 [2022-11-23 15:16:05,128 INFO L226 Difference]: Without dead ends: 280 [2022-11-23 15:16:05,129 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2906 GetRequests, 2866 SyntacticMatches, 9 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 245 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=205, Invalid=851, Unknown=0, NotChecked=0, Total=1056 [2022-11-23 15:16:05,129 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 58 mSDsluCounter, 126 mSDsCounter, 0 mSdLazyCounter, 327 mSolverCounterSat, 42 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 75 SdHoareTripleChecker+Valid, 142 SdHoareTripleChecker+Invalid, 369 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 42 IncrementalHoareTripleChecker+Valid, 327 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-23 15:16:05,130 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [75 Valid, 142 Invalid, 369 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [42 Valid, 327 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-23 15:16:05,130 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 280 states. [2022-11-23 15:16:05,157 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 280 to 270. [2022-11-23 15:16:05,157 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 270 states, 190 states have (on average 1.1105263157894736) internal successors, (211), 183 states have internal predecessors, (211), 53 states have call successors, (53), 40 states have call predecessors, (53), 26 states have return successors, (162), 46 states have call predecessors, (162), 53 states have call successors, (162) [2022-11-23 15:16:05,160 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 270 states to 270 states and 426 transitions. [2022-11-23 15:16:05,160 INFO L78 Accepts]: Start accepts. Automaton has 270 states and 426 transitions. Word has length 1439 [2022-11-23 15:16:05,161 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 15:16:05,161 INFO L495 AbstractCegarLoop]: Abstraction has 270 states and 426 transitions. [2022-11-23 15:16:05,161 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 22 states have (on average 3.6363636363636362) internal successors, (80), 24 states have internal predecessors, (80), 21 states have call successors, (24), 1 states have call predecessors, (24), 10 states have return successors, (30), 10 states have call predecessors, (30), 21 states have call successors, (30) [2022-11-23 15:16:05,161 INFO L276 IsEmpty]: Start isEmpty. Operand 270 states and 426 transitions. [2022-11-23 15:16:05,178 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1332 [2022-11-23 15:16:05,178 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 15:16:05,178 INFO L195 NwaCegarLoop]: trace histogram [103, 103, 92, 92, 82, 76, 51, 51, 51, 51, 51, 51, 51, 46, 46, 46, 46, 46, 46, 46, 36, 25, 21, 16, 1, 1, 1, 1, 1, 1] [2022-11-23 15:16:05,193 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb574073-9495-45bc-a341-0cb647c55fc4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2022-11-23 15:16:05,388 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb574073-9495-45bc-a341-0cb647c55fc4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2022-11-23 15:16:05,388 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 15:16:05,388 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 15:16:05,389 INFO L85 PathProgramCache]: Analyzing trace with hash 474590064, now seen corresponding path program 11 times [2022-11-23 15:16:05,389 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 15:16:05,389 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1582783173] [2022-11-23 15:16:05,389 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:16:05,389 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 15:16:05,716 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:16:08,288 INFO L134 CoverageAnalysis]: Checked inductivity of 53167 backedges. 797 proven. 3346 refuted. 0 times theorem prover too weak. 49024 trivial. 0 not checked. [2022-11-23 15:16:08,288 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 15:16:08,288 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1582783173] [2022-11-23 15:16:08,289 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1582783173] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 15:16:08,289 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1473109641] [2022-11-23 15:16:08,289 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-23 15:16:08,289 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:16:08,289 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb574073-9495-45bc-a341-0cb647c55fc4/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 15:16:08,290 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb574073-9495-45bc-a341-0cb647c55fc4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 15:16:08,294 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb574073-9495-45bc-a341-0cb647c55fc4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2022-11-23 15:16:08,737 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 18 check-sat command(s) [2022-11-23 15:16:08,737 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 15:16:08,741 INFO L263 TraceCheckSpWp]: Trace formula consists of 772 conjuncts, 12 conjunts are in the unsatisfiable core [2022-11-23 15:16:08,803 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 15:16:08,990 INFO L134 CoverageAnalysis]: Checked inductivity of 53167 backedges. 14563 proven. 63 refuted. 0 times theorem prover too weak. 38541 trivial. 0 not checked. [2022-11-23 15:16:08,991 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 15:16:12,982 INFO L134 CoverageAnalysis]: Checked inductivity of 53167 backedges. 3371 proven. 433 refuted. 0 times theorem prover too weak. 49363 trivial. 0 not checked. [2022-11-23 15:16:12,982 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1473109641] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 15:16:12,983 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2085101554] [2022-11-23 15:16:12,985 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2022-11-23 15:16:12,985 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 15:16:12,985 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:336) 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) [2022-11-23 15:16:12,986 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 15:16:12,987 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12, 13] total 25 [2022-11-23 15:16:12,987 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [226783071] [2022-11-23 15:16:12,988 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 15:16:12,989 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2022-11-23 15:16:12,990 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 15:16:12,990 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2022-11-23 15:16:12,990 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=523, Unknown=0, NotChecked=0, Total=600 [2022-11-23 15:16:12,991 INFO L87 Difference]: Start difference. First operand 270 states and 426 transitions. Second operand has 25 states, 24 states have (on average 4.208333333333333) internal successors, (101), 25 states have internal predecessors, (101), 17 states have call successors, (32), 2 states have call predecessors, (32), 14 states have return successors, (43), 18 states have call predecessors, (43), 17 states have call successors, (43) [2022-11-23 15:16:14,237 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 15:16:14,237 INFO L93 Difference]: Finished difference Result 660 states and 1165 transitions. [2022-11-23 15:16:14,237 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2022-11-23 15:16:14,238 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 24 states have (on average 4.208333333333333) internal successors, (101), 25 states have internal predecessors, (101), 17 states have call successors, (32), 2 states have call predecessors, (32), 14 states have return successors, (43), 18 states have call predecessors, (43), 17 states have call successors, (43) Word has length 1331 [2022-11-23 15:16:14,239 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 15:16:14,245 INFO L225 Difference]: With dead ends: 660 [2022-11-23 15:16:14,245 INFO L226 Difference]: Without dead ends: 392 [2022-11-23 15:16:14,249 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2706 GetRequests, 2650 SyntacticMatches, 6 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 534 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=404, Invalid=2248, Unknown=0, NotChecked=0, Total=2652 [2022-11-23 15:16:14,250 INFO L413 NwaCegarLoop]: 30 mSDtfsCounter, 165 mSDsluCounter, 183 mSDsCounter, 0 mSdLazyCounter, 827 mSolverCounterSat, 222 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 166 SdHoareTripleChecker+Valid, 213 SdHoareTripleChecker+Invalid, 1049 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 222 IncrementalHoareTripleChecker+Valid, 827 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-11-23 15:16:14,250 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [166 Valid, 213 Invalid, 1049 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [222 Valid, 827 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-11-23 15:16:14,251 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 392 states. [2022-11-23 15:16:14,328 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 392 to 313. [2022-11-23 15:16:14,331 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 313 states, 221 states have (on average 1.1085972850678734) internal successors, (245), 213 states have internal predecessors, (245), 65 states have call successors, (65), 49 states have call predecessors, (65), 26 states have return successors, (203), 50 states have call predecessors, (203), 65 states have call successors, (203) [2022-11-23 15:16:14,334 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 313 states to 313 states and 513 transitions. [2022-11-23 15:16:14,334 INFO L78 Accepts]: Start accepts. Automaton has 313 states and 513 transitions. Word has length 1331 [2022-11-23 15:16:14,335 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 15:16:14,335 INFO L495 AbstractCegarLoop]: Abstraction has 313 states and 513 transitions. [2022-11-23 15:16:14,336 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 24 states have (on average 4.208333333333333) internal successors, (101), 25 states have internal predecessors, (101), 17 states have call successors, (32), 2 states have call predecessors, (32), 14 states have return successors, (43), 18 states have call predecessors, (43), 17 states have call successors, (43) [2022-11-23 15:16:14,336 INFO L276 IsEmpty]: Start isEmpty. Operand 313 states and 513 transitions. [2022-11-23 15:16:14,374 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 2120 [2022-11-23 15:16:14,375 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 15:16:14,375 INFO L195 NwaCegarLoop]: trace histogram [160, 160, 151, 151, 128, 122, 80, 80, 80, 80, 80, 80, 80, 75, 75, 75, 75, 75, 75, 75, 48, 47, 38, 23, 1, 1, 1, 1, 1, 1] [2022-11-23 15:16:14,383 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb574073-9495-45bc-a341-0cb647c55fc4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2022-11-23 15:16:14,582 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb574073-9495-45bc-a341-0cb647c55fc4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2022-11-23 15:16:14,582 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 15:16:14,583 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 15:16:14,584 INFO L85 PathProgramCache]: Analyzing trace with hash 1831464502, now seen corresponding path program 12 times [2022-11-23 15:16:14,584 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 15:16:14,584 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1852351100] [2022-11-23 15:16:14,584 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:16:14,584 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 15:16:15,178 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:16:20,089 INFO L134 CoverageAnalysis]: Checked inductivity of 135429 backedges. 796 proven. 7643 refuted. 0 times theorem prover too weak. 126990 trivial. 0 not checked. [2022-11-23 15:16:20,089 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 15:16:20,089 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1852351100] [2022-11-23 15:16:20,089 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1852351100] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 15:16:20,089 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1117168984] [2022-11-23 15:16:20,090 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-23 15:16:20,091 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:16:20,091 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb574073-9495-45bc-a341-0cb647c55fc4/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 15:16:20,092 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb574073-9495-45bc-a341-0cb647c55fc4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 15:16:20,096 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb574073-9495-45bc-a341-0cb647c55fc4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2022-11-23 15:16:20,929 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-23 15:16:20,929 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 15:16:20,942 INFO L263 TraceCheckSpWp]: Trace formula consists of 3770 conjuncts, 22 conjunts are in the unsatisfiable core [2022-11-23 15:16:20,970 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 15:16:21,251 INFO L134 CoverageAnalysis]: Checked inductivity of 135429 backedges. 24464 proven. 360 refuted. 0 times theorem prover too weak. 110605 trivial. 0 not checked. [2022-11-23 15:16:21,251 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 15:16:29,834 INFO L134 CoverageAnalysis]: Checked inductivity of 135429 backedges. 1064 proven. 9695 refuted. 0 times theorem prover too weak. 124670 trivial. 0 not checked. [2022-11-23 15:16:29,835 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1117168984] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 15:16:29,835 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1893800135] [2022-11-23 15:16:29,837 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2022-11-23 15:16:29,837 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 15:16:29,837 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:336) 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) [2022-11-23 15:16:29,838 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 15:16:29,840 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 17, 23] total 33 [2022-11-23 15:16:29,840 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [583581472] [2022-11-23 15:16:29,840 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 15:16:29,843 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2022-11-23 15:16:29,844 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 15:16:29,844 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2022-11-23 15:16:29,844 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=115, Invalid=941, Unknown=0, NotChecked=0, Total=1056 [2022-11-23 15:16:29,844 INFO L87 Difference]: Start difference. First operand 313 states and 513 transitions. Second operand has 33 states, 32 states have (on average 3.84375) internal successors, (123), 33 states have internal predecessors, (123), 29 states have call successors, (38), 2 states have call predecessors, (38), 17 states have return successors, (50), 16 states have call predecessors, (50), 29 states have call successors, (50) [2022-11-23 15:16:31,727 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 15:16:31,727 INFO L93 Difference]: Finished difference Result 694 states and 1352 transitions. [2022-11-23 15:16:31,727 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2022-11-23 15:16:31,728 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 32 states have (on average 3.84375) internal successors, (123), 33 states have internal predecessors, (123), 29 states have call successors, (38), 2 states have call predecessors, (38), 17 states have return successors, (50), 16 states have call predecessors, (50), 29 states have call successors, (50) Word has length 2119 [2022-11-23 15:16:31,728 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 15:16:31,735 INFO L225 Difference]: With dead ends: 694 [2022-11-23 15:16:31,735 INFO L226 Difference]: Without dead ends: 375 [2022-11-23 15:16:31,740 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4299 GetRequests, 4217 SyntacticMatches, 11 SemanticMatches, 71 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1197 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=801, Invalid=4455, Unknown=0, NotChecked=0, Total=5256 [2022-11-23 15:16:31,741 INFO L413 NwaCegarLoop]: 31 mSDtfsCounter, 236 mSDsluCounter, 299 mSDsCounter, 0 mSdLazyCounter, 1552 mSolverCounterSat, 343 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 237 SdHoareTripleChecker+Valid, 330 SdHoareTripleChecker+Invalid, 1895 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 343 IncrementalHoareTripleChecker+Valid, 1552 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2022-11-23 15:16:31,741 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [237 Valid, 330 Invalid, 1895 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [343 Valid, 1552 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2022-11-23 15:16:31,742 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 375 states. [2022-11-23 15:16:31,774 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 375 to 295. [2022-11-23 15:16:31,775 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 295 states, 207 states have (on average 1.0917874396135265) internal successors, (226), 202 states have internal predecessors, (226), 62 states have call successors, (62), 46 states have call predecessors, (62), 25 states have return successors, (189), 46 states have call predecessors, (189), 62 states have call successors, (189) [2022-11-23 15:16:31,778 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 295 states to 295 states and 477 transitions. [2022-11-23 15:16:31,778 INFO L78 Accepts]: Start accepts. Automaton has 295 states and 477 transitions. Word has length 2119 [2022-11-23 15:16:31,779 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 15:16:31,779 INFO L495 AbstractCegarLoop]: Abstraction has 295 states and 477 transitions. [2022-11-23 15:16:31,779 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 32 states have (on average 3.84375) internal successors, (123), 33 states have internal predecessors, (123), 29 states have call successors, (38), 2 states have call predecessors, (38), 17 states have return successors, (50), 16 states have call predecessors, (50), 29 states have call successors, (50) [2022-11-23 15:16:31,780 INFO L276 IsEmpty]: Start isEmpty. Operand 295 states and 477 transitions. [2022-11-23 15:16:31,803 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1590 [2022-11-23 15:16:31,803 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 15:16:31,804 INFO L195 NwaCegarLoop]: trace histogram [117, 117, 116, 116, 95, 93, 58, 58, 58, 58, 58, 58, 58, 58, 58, 58, 58, 58, 58, 58, 37, 35, 23, 22, 1, 1, 1, 1, 1, 1] [2022-11-23 15:16:31,815 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb574073-9495-45bc-a341-0cb647c55fc4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2022-11-23 15:16:32,015 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb574073-9495-45bc-a341-0cb647c55fc4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:16:32,015 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 15:16:32,016 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 15:16:32,016 INFO L85 PathProgramCache]: Analyzing trace with hash -634342967, now seen corresponding path program 13 times [2022-11-23 15:16:32,016 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 15:16:32,016 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [396374220] [2022-11-23 15:16:32,017 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:16:32,017 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 15:16:32,292 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:16:36,189 INFO L134 CoverageAnalysis]: Checked inductivity of 75791 backedges. 4101 proven. 3802 refuted. 0 times theorem prover too weak. 67888 trivial. 0 not checked. [2022-11-23 15:16:36,190 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 15:16:36,190 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [396374220] [2022-11-23 15:16:36,190 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [396374220] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 15:16:36,191 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1359052715] [2022-11-23 15:16:36,191 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-23 15:16:36,192 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:16:36,192 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb574073-9495-45bc-a341-0cb647c55fc4/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 15:16:36,193 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb574073-9495-45bc-a341-0cb647c55fc4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 15:16:36,200 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb574073-9495-45bc-a341-0cb647c55fc4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2022-11-23 15:16:37,027 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:16:37,040 INFO L263 TraceCheckSpWp]: Trace formula consists of 3553 conjuncts, 24 conjunts are in the unsatisfiable core [2022-11-23 15:16:37,054 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 15:16:37,414 INFO L134 CoverageAnalysis]: Checked inductivity of 75791 backedges. 852 proven. 6015 refuted. 0 times theorem prover too weak. 68924 trivial. 0 not checked. [2022-11-23 15:16:37,414 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 15:16:45,993 INFO L134 CoverageAnalysis]: Checked inductivity of 75791 backedges. 852 proven. 6085 refuted. 0 times theorem prover too weak. 68854 trivial. 0 not checked. [2022-11-23 15:16:45,994 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1359052715] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 15:16:45,994 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [332307264] [2022-11-23 15:16:45,995 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2022-11-23 15:16:45,996 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 15:16:45,996 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:336) 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) [2022-11-23 15:16:45,996 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 15:16:45,997 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 16, 25] total 43 [2022-11-23 15:16:45,997 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1821736728] [2022-11-23 15:16:45,998 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 15:16:45,999 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 43 states [2022-11-23 15:16:46,000 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 15:16:46,000 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2022-11-23 15:16:46,001 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=194, Invalid=1612, Unknown=0, NotChecked=0, Total=1806 [2022-11-23 15:16:46,001 INFO L87 Difference]: Start difference. First operand 295 states and 477 transitions. Second operand has 43 states, 41 states have (on average 3.2195121951219514) internal successors, (132), 43 states have internal predecessors, (132), 34 states have call successors, (42), 1 states have call predecessors, (42), 22 states have return successors, (57), 25 states have call predecessors, (57), 34 states have call successors, (57) [2022-11-23 15:16:49,643 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 15:16:49,643 INFO L93 Difference]: Finished difference Result 824 states and 1606 transitions. [2022-11-23 15:16:49,643 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 83 states. [2022-11-23 15:16:49,644 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 41 states have (on average 3.2195121951219514) internal successors, (132), 43 states have internal predecessors, (132), 34 states have call successors, (42), 1 states have call predecessors, (42), 22 states have return successors, (57), 25 states have call predecessors, (57), 34 states have call successors, (57) Word has length 1589 [2022-11-23 15:16:49,646 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 15:16:49,655 INFO L225 Difference]: With dead ends: 824 [2022-11-23 15:16:49,655 INFO L226 Difference]: Without dead ends: 526 [2022-11-23 15:16:49,662 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3269 GetRequests, 3153 SyntacticMatches, 11 SemanticMatches, 105 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3343 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=1460, Invalid=9882, Unknown=0, NotChecked=0, Total=11342 [2022-11-23 15:16:49,663 INFO L413 NwaCegarLoop]: 55 mSDtfsCounter, 333 mSDsluCounter, 518 mSDsCounter, 0 mSdLazyCounter, 3029 mSolverCounterSat, 861 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 334 SdHoareTripleChecker+Valid, 573 SdHoareTripleChecker+Invalid, 3890 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 861 IncrementalHoareTripleChecker+Valid, 3029 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.1s IncrementalHoareTripleChecker+Time [2022-11-23 15:16:49,664 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [334 Valid, 573 Invalid, 3890 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [861 Valid, 3029 Invalid, 0 Unknown, 0 Unchecked, 2.1s Time] [2022-11-23 15:16:49,665 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 526 states. [2022-11-23 15:16:49,710 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 526 to 372. [2022-11-23 15:16:49,711 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 372 states, 259 states have (on average 1.0617760617760619) internal successors, (275), 254 states have internal predecessors, (275), 81 states have call successors, (81), 56 states have call predecessors, (81), 31 states have return successors, (268), 61 states have call predecessors, (268), 81 states have call successors, (268) [2022-11-23 15:16:49,714 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 372 states to 372 states and 624 transitions. [2022-11-23 15:16:49,715 INFO L78 Accepts]: Start accepts. Automaton has 372 states and 624 transitions. Word has length 1589 [2022-11-23 15:16:49,715 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 15:16:49,716 INFO L495 AbstractCegarLoop]: Abstraction has 372 states and 624 transitions. [2022-11-23 15:16:49,716 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 43 states, 41 states have (on average 3.2195121951219514) internal successors, (132), 43 states have internal predecessors, (132), 34 states have call successors, (42), 1 states have call predecessors, (42), 22 states have return successors, (57), 25 states have call predecessors, (57), 34 states have call successors, (57) [2022-11-23 15:16:49,716 INFO L276 IsEmpty]: Start isEmpty. Operand 372 states and 624 transitions. [2022-11-23 15:16:49,771 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 2584 [2022-11-23 15:16:49,771 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 15:16:49,772 INFO L195 NwaCegarLoop]: trace histogram [193, 193, 186, 186, 153, 153, 96, 96, 96, 96, 96, 96, 96, 93, 93, 93, 93, 93, 93, 93, 60, 57, 40, 33, 1, 1, 1, 1, 1, 1] [2022-11-23 15:16:49,787 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb574073-9495-45bc-a341-0cb647c55fc4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2022-11-23 15:16:49,982 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb574073-9495-45bc-a341-0cb647c55fc4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:16:49,982 INFO L420 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 15:16:49,982 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 15:16:49,983 INFO L85 PathProgramCache]: Analyzing trace with hash -399075658, now seen corresponding path program 14 times [2022-11-23 15:16:49,983 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 15:16:49,983 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1822433445] [2022-11-23 15:16:49,983 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:16:49,983 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 15:16:50,786 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:16:59,405 INFO L134 CoverageAnalysis]: Checked inductivity of 201540 backedges. 4295 proven. 9450 refuted. 0 times theorem prover too weak. 187795 trivial. 0 not checked. [2022-11-23 15:16:59,405 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 15:16:59,406 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1822433445] [2022-11-23 15:16:59,406 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1822433445] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 15:16:59,406 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2106387891] [2022-11-23 15:16:59,406 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-23 15:16:59,406 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:16:59,407 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb574073-9495-45bc-a341-0cb647c55fc4/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 15:16:59,410 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb574073-9495-45bc-a341-0cb647c55fc4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 15:16:59,413 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb574073-9495-45bc-a341-0cb647c55fc4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2022-11-23 15:17:00,202 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 37 check-sat command(s) [2022-11-23 15:17:00,202 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 15:17:00,209 INFO L263 TraceCheckSpWp]: Trace formula consists of 1273 conjuncts, 18 conjunts are in the unsatisfiable core [2022-11-23 15:17:00,226 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 15:17:00,631 INFO L134 CoverageAnalysis]: Checked inductivity of 201540 backedges. 33705 proven. 353 refuted. 0 times theorem prover too weak. 167482 trivial. 0 not checked. [2022-11-23 15:17:00,632 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 15:17:09,140 INFO L134 CoverageAnalysis]: Checked inductivity of 201540 backedges. 9143 proven. 941 refuted. 0 times theorem prover too weak. 191456 trivial. 0 not checked. [2022-11-23 15:17:09,140 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2106387891] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 15:17:09,140 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [435223530] [2022-11-23 15:17:09,142 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2022-11-23 15:17:09,142 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 15:17:09,142 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:336) 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) [2022-11-23 15:17:09,142 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 15:17:09,143 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 15, 19] total 38 [2022-11-23 15:17:09,143 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [715334861] [2022-11-23 15:17:09,143 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 15:17:09,145 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2022-11-23 15:17:09,145 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 15:17:09,145 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2022-11-23 15:17:09,146 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=157, Invalid=1249, Unknown=0, NotChecked=0, Total=1406 [2022-11-23 15:17:09,146 INFO L87 Difference]: Start difference. First operand 372 states and 624 transitions. Second operand has 38 states, 38 states have (on average 3.5) internal successors, (133), 38 states have internal predecessors, (133), 24 states have call successors, (41), 2 states have call predecessors, (41), 21 states have return successors, (58), 29 states have call predecessors, (58), 24 states have call successors, (58) [2022-11-23 15:17:11,614 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 15:17:11,614 INFO L93 Difference]: Finished difference Result 890 states and 1648 transitions. [2022-11-23 15:17:11,615 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2022-11-23 15:17:11,615 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 3.5) internal successors, (133), 38 states have internal predecessors, (133), 24 states have call successors, (41), 2 states have call predecessors, (41), 21 states have return successors, (58), 29 states have call predecessors, (58), 24 states have call successors, (58) Word has length 2583 [2022-11-23 15:17:11,617 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 15:17:11,624 INFO L225 Difference]: With dead ends: 890 [2022-11-23 15:17:11,624 INFO L226 Difference]: Without dead ends: 497 [2022-11-23 15:17:11,632 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 5242 GetRequests, 5148 SyntacticMatches, 9 SemanticMatches, 85 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2285 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=956, Invalid=6526, Unknown=0, NotChecked=0, Total=7482 [2022-11-23 15:17:11,633 INFO L413 NwaCegarLoop]: 64 mSDtfsCounter, 222 mSDsluCounter, 624 mSDsCounter, 0 mSdLazyCounter, 2541 mSolverCounterSat, 321 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 222 SdHoareTripleChecker+Valid, 688 SdHoareTripleChecker+Invalid, 2862 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 321 IncrementalHoareTripleChecker+Valid, 2541 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2022-11-23 15:17:11,633 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [222 Valid, 688 Invalid, 2862 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [321 Valid, 2541 Invalid, 0 Unknown, 0 Unchecked, 1.4s Time] [2022-11-23 15:17:11,634 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 497 states. [2022-11-23 15:17:11,695 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 497 to 456. [2022-11-23 15:17:11,696 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 456 states, 325 states have (on average 1.04) internal successors, (338), 316 states have internal predecessors, (338), 99 states have call successors, (99), 78 states have call predecessors, (99), 31 states have return successors, (323), 61 states have call predecessors, (323), 99 states have call successors, (323) [2022-11-23 15:17:11,701 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 456 states to 456 states and 760 transitions. [2022-11-23 15:17:11,702 INFO L78 Accepts]: Start accepts. Automaton has 456 states and 760 transitions. Word has length 2583 [2022-11-23 15:17:11,703 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 15:17:11,703 INFO L495 AbstractCegarLoop]: Abstraction has 456 states and 760 transitions. [2022-11-23 15:17:11,704 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 38 states have (on average 3.5) internal successors, (133), 38 states have internal predecessors, (133), 24 states have call successors, (41), 2 states have call predecessors, (41), 21 states have return successors, (58), 29 states have call predecessors, (58), 24 states have call successors, (58) [2022-11-23 15:17:11,704 INFO L276 IsEmpty]: Start isEmpty. Operand 456 states and 760 transitions. [2022-11-23 15:17:11,861 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 2625 [2022-11-23 15:17:11,861 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 15:17:11,862 INFO L195 NwaCegarLoop]: trace histogram [199, 199, 186, 186, 158, 153, 99, 99, 99, 99, 99, 99, 99, 93, 93, 93, 93, 93, 93, 93, 65, 54, 41, 33, 1, 1, 1, 1, 1, 1] [2022-11-23 15:17:11,876 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb574073-9495-45bc-a341-0cb647c55fc4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2022-11-23 15:17:12,076 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb574073-9495-45bc-a341-0cb647c55fc4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:17:12,077 INFO L420 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 15:17:12,078 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 15:17:12,079 INFO L85 PathProgramCache]: Analyzing trace with hash -191682701, now seen corresponding path program 15 times [2022-11-23 15:17:12,079 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 15:17:12,079 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [545843935] [2022-11-23 15:17:12,079 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:17:12,080 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 15:17:12,850 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:17:22,990 INFO L134 CoverageAnalysis]: Checked inductivity of 208171 backedges. 7178 proven. 8263 refuted. 0 times theorem prover too weak. 192730 trivial. 0 not checked. [2022-11-23 15:17:22,990 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 15:17:22,990 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [545843935] [2022-11-23 15:17:22,990 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [545843935] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 15:17:22,990 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [704469379] [2022-11-23 15:17:22,990 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-23 15:17:22,991 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:17:22,991 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb574073-9495-45bc-a341-0cb647c55fc4/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 15:17:22,992 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb574073-9495-45bc-a341-0cb647c55fc4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 15:17:22,994 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb574073-9495-45bc-a341-0cb647c55fc4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2022-11-23 15:17:24,061 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-23 15:17:24,061 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 15:17:24,076 INFO L263 TraceCheckSpWp]: Trace formula consists of 4669 conjuncts, 22 conjunts are in the unsatisfiable core [2022-11-23 15:17:24,095 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 15:17:24,401 INFO L134 CoverageAnalysis]: Checked inductivity of 208171 backedges. 36976 proven. 427 refuted. 0 times theorem prover too weak. 170768 trivial. 0 not checked. [2022-11-23 15:17:24,401 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 15:17:35,128 INFO L134 CoverageAnalysis]: Checked inductivity of 208171 backedges. 1947 proven. 12047 refuted. 0 times theorem prover too weak. 194177 trivial. 0 not checked. [2022-11-23 15:17:35,129 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [704469379] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 15:17:35,129 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1517423264] [2022-11-23 15:17:35,131 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2022-11-23 15:17:35,131 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 15:17:35,131 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:336) 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) [2022-11-23 15:17:35,131 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 15:17:35,132 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 17, 23] total 40 [2022-11-23 15:17:35,133 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1279857289] [2022-11-23 15:17:35,133 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 15:17:35,136 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2022-11-23 15:17:35,136 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 15:17:35,136 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2022-11-23 15:17:35,137 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=178, Invalid=1382, Unknown=0, NotChecked=0, Total=1560 [2022-11-23 15:17:35,137 INFO L87 Difference]: Start difference. First operand 456 states and 760 transitions. Second operand has 40 states, 40 states have (on average 3.45) internal successors, (138), 40 states have internal predecessors, (138), 31 states have call successors, (43), 2 states have call predecessors, (43), 21 states have return successors, (60), 23 states have call predecessors, (60), 31 states have call successors, (60) [2022-11-23 15:17:37,770 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 15:17:37,771 INFO L93 Difference]: Finished difference Result 993 states and 1778 transitions. [2022-11-23 15:17:37,771 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 68 states. [2022-11-23 15:17:37,772 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 3.45) internal successors, (138), 40 states have internal predecessors, (138), 31 states have call successors, (43), 2 states have call predecessors, (43), 21 states have return successors, (60), 23 states have call predecessors, (60), 31 states have call successors, (60) Word has length 2624 [2022-11-23 15:17:37,772 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 15:17:37,780 INFO L225 Difference]: With dead ends: 993 [2022-11-23 15:17:37,780 INFO L226 Difference]: Without dead ends: 516 [2022-11-23 15:17:37,786 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 5330 GetRequests, 5230 SyntacticMatches, 11 SemanticMatches, 89 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2423 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=1068, Invalid=7122, Unknown=0, NotChecked=0, Total=8190 [2022-11-23 15:17:37,787 INFO L413 NwaCegarLoop]: 70 mSDtfsCounter, 264 mSDsluCounter, 658 mSDsCounter, 0 mSdLazyCounter, 2505 mSolverCounterSat, 515 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 264 SdHoareTripleChecker+Valid, 728 SdHoareTripleChecker+Invalid, 3020 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 515 IncrementalHoareTripleChecker+Valid, 2505 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.5s IncrementalHoareTripleChecker+Time [2022-11-23 15:17:37,788 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [264 Valid, 728 Invalid, 3020 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [515 Valid, 2505 Invalid, 0 Unknown, 0 Unchecked, 1.5s Time] [2022-11-23 15:17:37,789 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 516 states. [2022-11-23 15:17:37,836 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 516 to 395. [2022-11-23 15:17:37,837 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 395 states, 281 states have (on average 1.0391459074733096) internal successors, (292), 274 states have internal predecessors, (292), 85 states have call successors, (85), 67 states have call predecessors, (85), 28 states have return successors, (208), 53 states have call predecessors, (208), 85 states have call successors, (208) [2022-11-23 15:17:37,848 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 395 states to 395 states and 585 transitions. [2022-11-23 15:17:37,850 INFO L78 Accepts]: Start accepts. Automaton has 395 states and 585 transitions. Word has length 2624 [2022-11-23 15:17:37,851 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 15:17:37,851 INFO L495 AbstractCegarLoop]: Abstraction has 395 states and 585 transitions. [2022-11-23 15:17:37,852 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 40 states, 40 states have (on average 3.45) internal successors, (138), 40 states have internal predecessors, (138), 31 states have call successors, (43), 2 states have call predecessors, (43), 21 states have return successors, (60), 23 states have call predecessors, (60), 31 states have call successors, (60) [2022-11-23 15:17:37,852 INFO L276 IsEmpty]: Start isEmpty. Operand 395 states and 585 transitions. [2022-11-23 15:17:38,309 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8441 [2022-11-23 15:17:38,309 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 15:17:38,310 INFO L195 NwaCegarLoop]: trace histogram [622, 622, 617, 617, 508, 495, 311, 311, 311, 311, 311, 311, 311, 308, 308, 308, 308, 308, 308, 308, 200, 184, 122, 114, 1, 1, 1, 1, 1, 1] [2022-11-23 15:17:38,320 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb574073-9495-45bc-a341-0cb647c55fc4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2022-11-23 15:17:38,511 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb574073-9495-45bc-a341-0cb647c55fc4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2022-11-23 15:17:38,511 INFO L420 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 15:17:38,512 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 15:17:38,513 INFO L85 PathProgramCache]: Analyzing trace with hash 1816532320, now seen corresponding path program 16 times [2022-11-23 15:17:38,513 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 15:17:38,513 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [936210170] [2022-11-23 15:17:38,514 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:17:38,514 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 15:17:42,916 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:18:41,152 INFO L134 CoverageAnalysis]: Checked inductivity of 2165643 backedges. 3887 proven. 30585 refuted. 0 times theorem prover too weak. 2131171 trivial. 0 not checked. [2022-11-23 15:18:41,152 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 15:18:41,152 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [936210170] [2022-11-23 15:18:41,152 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [936210170] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 15:18:41,153 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [894194793] [2022-11-23 15:18:41,153 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-23 15:18:41,153 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:18:41,153 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb574073-9495-45bc-a341-0cb647c55fc4/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 15:18:41,155 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb574073-9495-45bc-a341-0cb647c55fc4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 15:18:41,157 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb574073-9495-45bc-a341-0cb647c55fc4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2022-11-23 15:18:44,387 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:18:44,464 INFO L263 TraceCheckSpWp]: Trace formula consists of 18764 conjuncts, 26 conjunts are in the unsatisfiable core [2022-11-23 15:18:44,538 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 15:18:45,102 INFO L134 CoverageAnalysis]: Checked inductivity of 2165643 backedges. 3380 proven. 38167 refuted. 0 times theorem prover too weak. 2124096 trivial. 0 not checked. [2022-11-23 15:18:45,102 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 15:19:16,086 INFO L134 CoverageAnalysis]: Checked inductivity of 2165643 backedges. 3380 proven. 38252 refuted. 0 times theorem prover too weak. 2124011 trivial. 0 not checked. [2022-11-23 15:19:16,087 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [894194793] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 15:19:16,087 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [746002767] [2022-11-23 15:19:16,090 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2022-11-23 15:19:16,090 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 15:19:16,090 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:336) 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) [2022-11-23 15:19:16,091 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 15:19:16,094 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 17, 27] total 35 [2022-11-23 15:19:16,094 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2048166454] [2022-11-23 15:19:16,094 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 15:19:16,102 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2022-11-23 15:19:16,102 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 15:19:16,102 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2022-11-23 15:19:16,103 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=195, Invalid=995, Unknown=0, NotChecked=0, Total=1190 [2022-11-23 15:19:16,103 INFO L87 Difference]: Start difference. First operand 395 states and 585 transitions. Second operand has 35 states, 33 states have (on average 3.4242424242424243) internal successors, (113), 35 states have internal predecessors, (113), 31 states have call successors, (35), 1 states have call predecessors, (35), 18 states have return successors, (50), 19 states have call predecessors, (50), 31 states have call successors, (50) [2022-11-23 15:19:16,817 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 15:19:16,817 INFO L93 Difference]: Finished difference Result 460 states and 785 transitions. [2022-11-23 15:19:16,817 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2022-11-23 15:19:16,817 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 33 states have (on average 3.4242424242424243) internal successors, (113), 35 states have internal predecessors, (113), 31 states have call successors, (35), 1 states have call predecessors, (35), 18 states have return successors, (50), 19 states have call predecessors, (50), 31 states have call successors, (50) Word has length 8440 [2022-11-23 15:19:16,823 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 15:19:16,828 INFO L225 Difference]: With dead ends: 460 [2022-11-23 15:19:16,828 INFO L226 Difference]: Without dead ends: 433 [2022-11-23 15:19:16,829 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 16918 GetRequests, 16856 SyntacticMatches, 12 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 872 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=493, Invalid=2159, Unknown=0, NotChecked=0, Total=2652 [2022-11-23 15:19:16,830 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 202 mSDsluCounter, 163 mSDsCounter, 0 mSdLazyCounter, 542 mSolverCounterSat, 216 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 217 SdHoareTripleChecker+Valid, 179 SdHoareTripleChecker+Invalid, 758 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 216 IncrementalHoareTripleChecker+Valid, 542 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-23 15:19:16,830 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [217 Valid, 179 Invalid, 758 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [216 Valid, 542 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-23 15:19:16,831 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 433 states. [2022-11-23 15:19:16,878 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 433 to 418. [2022-11-23 15:19:16,879 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 418 states, 295 states have (on average 1.0372881355932204) internal successors, (306), 288 states have internal predecessors, (306), 89 states have call successors, (89), 67 states have call predecessors, (89), 33 states have return successors, (251), 62 states have call predecessors, (251), 89 states have call successors, (251) [2022-11-23 15:19:16,882 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 418 states to 418 states and 646 transitions. [2022-11-23 15:19:16,883 INFO L78 Accepts]: Start accepts. Automaton has 418 states and 646 transitions. Word has length 8440 [2022-11-23 15:19:16,884 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 15:19:16,884 INFO L495 AbstractCegarLoop]: Abstraction has 418 states and 646 transitions. [2022-11-23 15:19:16,885 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 33 states have (on average 3.4242424242424243) internal successors, (113), 35 states have internal predecessors, (113), 31 states have call successors, (35), 1 states have call predecessors, (35), 18 states have return successors, (50), 19 states have call predecessors, (50), 31 states have call successors, (50) [2022-11-23 15:19:16,885 INFO L276 IsEmpty]: Start isEmpty. Operand 418 states and 646 transitions. [2022-11-23 15:19:17,251 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7378 [2022-11-23 15:19:17,251 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 15:19:17,252 INFO L195 NwaCegarLoop]: trace histogram [543, 543, 540, 540, 439, 437, 271, 271, 271, 271, 271, 271, 271, 270, 270, 270, 270, 270, 270, 270, 168, 167, 106, 101, 1, 1, 1, 1, 1, 1] [2022-11-23 15:19:17,281 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb574073-9495-45bc-a341-0cb647c55fc4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2022-11-23 15:19:17,453 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22,22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb574073-9495-45bc-a341-0cb647c55fc4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:19:17,453 INFO L420 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 15:19:17,454 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 15:19:17,455 INFO L85 PathProgramCache]: Analyzing trace with hash -639377732, now seen corresponding path program 17 times [2022-11-23 15:19:17,456 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 15:19:17,456 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [728250024] [2022-11-23 15:19:17,456 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:19:17,456 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 15:19:22,983 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:20:21,708 INFO L134 CoverageAnalysis]: Checked inductivity of 1653739 backedges. 3712 proven. 35622 refuted. 0 times theorem prover too weak. 1614405 trivial. 0 not checked. [2022-11-23 15:20:21,708 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 15:20:21,708 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [728250024] [2022-11-23 15:20:21,711 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [728250024] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 15:20:21,711 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [659875323] [2022-11-23 15:20:21,712 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-23 15:20:21,712 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:20:21,712 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb574073-9495-45bc-a341-0cb647c55fc4/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 15:20:21,713 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb574073-9495-45bc-a341-0cb647c55fc4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 15:20:21,714 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb574073-9495-45bc-a341-0cb647c55fc4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2022-11-23 15:20:23,217 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 52 check-sat command(s) [2022-11-23 15:20:23,217 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 15:20:23,230 INFO L263 TraceCheckSpWp]: Trace formula consists of 1952 conjuncts, 28 conjunts are in the unsatisfiable core [2022-11-23 15:20:23,392 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 15:20:23,690 INFO L134 CoverageAnalysis]: Checked inductivity of 1653739 backedges. 3712 proven. 35622 refuted. 0 times theorem prover too weak. 1614405 trivial. 0 not checked. [2022-11-23 15:20:23,690 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 15:20:52,962 INFO L134 CoverageAnalysis]: Checked inductivity of 1653739 backedges. 3712 proven. 35724 refuted. 0 times theorem prover too weak. 1614303 trivial. 0 not checked. [2022-11-23 15:20:52,962 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [659875323] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 15:20:52,962 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [56718705] [2022-11-23 15:20:52,966 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2022-11-23 15:20:52,966 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 15:20:52,966 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:336) 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) [2022-11-23 15:20:52,967 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 15:20:52,970 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 29] total 32 [2022-11-23 15:20:52,971 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1264967124] [2022-11-23 15:20:52,971 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 15:20:52,976 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2022-11-23 15:20:52,976 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 15:20:52,976 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2022-11-23 15:20:52,977 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=160, Invalid=832, Unknown=0, NotChecked=0, Total=992 [2022-11-23 15:20:52,977 INFO L87 Difference]: Start difference. First operand 418 states and 646 transitions. Second operand has 32 states, 30 states have (on average 3.466666666666667) internal successors, (104), 32 states have internal predecessors, (104), 29 states have call successors, (32), 1 states have call predecessors, (32), 14 states have return successors, (42), 14 states have call predecessors, (42), 29 states have call successors, (42) [2022-11-23 15:20:53,505 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 15:20:53,505 INFO L93 Difference]: Finished difference Result 448 states and 728 transitions. [2022-11-23 15:20:53,505 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-11-23 15:20:53,506 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 30 states have (on average 3.466666666666667) internal successors, (104), 32 states have internal predecessors, (104), 29 states have call successors, (32), 1 states have call predecessors, (32), 14 states have return successors, (42), 14 states have call predecessors, (42), 29 states have call successors, (42) Word has length 7377 [2022-11-23 15:20:53,513 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 15:20:53,517 INFO L225 Difference]: With dead ends: 448 [2022-11-23 15:20:53,517 INFO L226 Difference]: Without dead ends: 434 [2022-11-23 15:20:53,519 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 14794 GetRequests, 14738 SyntacticMatches, 13 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 535 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=369, Invalid=1611, Unknown=0, NotChecked=0, Total=1980 [2022-11-23 15:20:53,519 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 156 mSDsluCounter, 174 mSDsCounter, 0 mSdLazyCounter, 495 mSolverCounterSat, 145 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 177 SdHoareTripleChecker+Valid, 190 SdHoareTripleChecker+Invalid, 640 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 145 IncrementalHoareTripleChecker+Valid, 495 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-23 15:20:53,519 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [177 Valid, 190 Invalid, 640 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [145 Valid, 495 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-23 15:20:53,520 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 434 states. [2022-11-23 15:20:53,564 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 434 to 418. [2022-11-23 15:20:53,565 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 418 states, 295 states have (on average 1.0372881355932204) internal successors, (306), 288 states have internal predecessors, (306), 89 states have call successors, (89), 67 states have call predecessors, (89), 33 states have return successors, (248), 62 states have call predecessors, (248), 89 states have call successors, (248) [2022-11-23 15:20:53,568 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 418 states to 418 states and 643 transitions. [2022-11-23 15:20:53,568 INFO L78 Accepts]: Start accepts. Automaton has 418 states and 643 transitions. Word has length 7377 [2022-11-23 15:20:53,569 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 15:20:53,570 INFO L495 AbstractCegarLoop]: Abstraction has 418 states and 643 transitions. [2022-11-23 15:20:53,570 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 30 states have (on average 3.466666666666667) internal successors, (104), 32 states have internal predecessors, (104), 29 states have call successors, (32), 1 states have call predecessors, (32), 14 states have return successors, (42), 14 states have call predecessors, (42), 29 states have call successors, (42) [2022-11-23 15:20:53,570 INFO L276 IsEmpty]: Start isEmpty. Operand 418 states and 643 transitions. [2022-11-23 15:20:54,771 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14610 [2022-11-23 15:20:54,771 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 15:20:54,773 INFO L195 NwaCegarLoop]: trace histogram [1084, 1084, 1061, 1061, 881, 855, 542, 542, 542, 542, 542, 542, 542, 530, 530, 530, 530, 530, 530, 530, 351, 313, 206, 203, 1, 1, 1, 1, 1, 1] [2022-11-23 15:20:54,780 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb574073-9495-45bc-a341-0cb647c55fc4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2022-11-23 15:20:54,973 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23,23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb574073-9495-45bc-a341-0cb647c55fc4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:20:54,973 INFO L420 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 15:20:54,974 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 15:20:54,975 INFO L85 PathProgramCache]: Analyzing trace with hash 1152075313, now seen corresponding path program 18 times [2022-11-23 15:20:54,975 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 15:20:54,975 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [672075192] [2022-11-23 15:20:54,976 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:20:54,976 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 15:21:05,714 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:24:34,304 INFO L134 CoverageAnalysis]: Checked inductivity of 6497173 backedges. 12361 proven. 84887 refuted. 0 times theorem prover too weak. 6399925 trivial. 0 not checked. [2022-11-23 15:24:34,304 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 15:24:34,305 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [672075192] [2022-11-23 15:24:34,305 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [672075192] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 15:24:34,305 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1484814350] [2022-11-23 15:24:34,306 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-23 15:24:34,306 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:24:34,306 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb574073-9495-45bc-a341-0cb647c55fc4/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 15:24:34,310 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb574073-9495-45bc-a341-0cb647c55fc4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 15:24:34,312 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb574073-9495-45bc-a341-0cb647c55fc4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2022-11-23 15:24:39,302 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-23 15:24:39,303 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 15:24:39,414 INFO L263 TraceCheckSpWp]: Trace formula consists of 25999 conjuncts, 34 conjunts are in the unsatisfiable core [2022-11-23 15:24:39,529 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 15:24:40,608 INFO L134 CoverageAnalysis]: Checked inductivity of 6497173 backedges. 865063 proven. 4430 refuted. 0 times theorem prover too weak. 5627680 trivial. 0 not checked. [2022-11-23 15:24:40,608 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 15:25:41,655 INFO L134 CoverageAnalysis]: Checked inductivity of 6497173 backedges. 10908 proven. 106218 refuted. 0 times theorem prover too weak. 6380047 trivial. 0 not checked. [2022-11-23 15:25:41,656 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1484814350] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 15:25:41,656 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [488041235] [2022-11-23 15:25:41,660 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2022-11-23 15:25:41,660 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 15:25:41,661 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:336) 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) [2022-11-23 15:25:41,661 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 15:25:41,665 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 23, 35] total 44 [2022-11-23 15:25:41,665 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1093788438] [2022-11-23 15:25:41,665 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 15:25:41,674 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 44 states [2022-11-23 15:25:41,675 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 15:25:41,675 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2022-11-23 15:25:41,676 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=188, Invalid=1704, Unknown=0, NotChecked=0, Total=1892 [2022-11-23 15:25:41,676 INFO L87 Difference]: Start difference. First operand 418 states and 643 transitions. Second operand has 44 states, 44 states have (on average 3.4318181818181817) internal successors, (151), 44 states have internal predecessors, (151), 37 states have call successors, (48), 2 states have call predecessors, (48), 19 states have return successors, (64), 21 states have call predecessors, (64), 37 states have call successors, (64) [2022-11-23 15:25:44,228 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 15:25:44,229 INFO L93 Difference]: Finished difference Result 838 states and 1346 transitions. [2022-11-23 15:25:44,229 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2022-11-23 15:25:44,230 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 44 states have (on average 3.4318181818181817) internal successors, (151), 44 states have internal predecessors, (151), 37 states have call successors, (48), 2 states have call predecessors, (48), 19 states have return successors, (64), 21 states have call predecessors, (64), 37 states have call successors, (64) Word has length 14609 [2022-11-23 15:25:44,231 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 15:25:44,236 INFO L225 Difference]: With dead ends: 838 [2022-11-23 15:25:44,236 INFO L226 Difference]: Without dead ends: 441 [2022-11-23 15:25:44,240 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 29291 GetRequests, 29186 SyntacticMatches, 17 SemanticMatches, 88 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2053 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=1129, Invalid=6881, Unknown=0, NotChecked=0, Total=8010 [2022-11-23 15:25:44,241 INFO L413 NwaCegarLoop]: 49 mSDtfsCounter, 384 mSDsluCounter, 527 mSDsCounter, 0 mSdLazyCounter, 2012 mSolverCounterSat, 596 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 384 SdHoareTripleChecker+Valid, 576 SdHoareTripleChecker+Invalid, 2608 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 596 IncrementalHoareTripleChecker+Valid, 2012 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.3s IncrementalHoareTripleChecker+Time [2022-11-23 15:25:44,242 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [384 Valid, 576 Invalid, 2608 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [596 Valid, 2012 Invalid, 0 Unknown, 0 Unchecked, 1.3s Time] [2022-11-23 15:25:44,243 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 441 states. [2022-11-23 15:25:44,289 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 441 to 375. [2022-11-23 15:25:44,290 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 375 states, 267 states have (on average 1.0411985018726593) internal successors, (278), 259 states have internal predecessors, (278), 78 states have call successors, (78), 62 states have call predecessors, (78), 29 states have return successors, (180), 53 states have call predecessors, (180), 78 states have call successors, (180) [2022-11-23 15:25:44,292 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 375 states to 375 states and 536 transitions. [2022-11-23 15:25:44,293 INFO L78 Accepts]: Start accepts. Automaton has 375 states and 536 transitions. Word has length 14609 [2022-11-23 15:25:44,295 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 15:25:44,295 INFO L495 AbstractCegarLoop]: Abstraction has 375 states and 536 transitions. [2022-11-23 15:25:44,296 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 44 states, 44 states have (on average 3.4318181818181817) internal successors, (151), 44 states have internal predecessors, (151), 37 states have call successors, (48), 2 states have call predecessors, (48), 19 states have return successors, (64), 21 states have call predecessors, (64), 37 states have call successors, (64) [2022-11-23 15:25:44,296 INFO L276 IsEmpty]: Start isEmpty. Operand 375 states and 536 transitions. [2022-11-23 15:25:45,024 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8372 [2022-11-23 15:25:45,024 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 15:25:45,026 INFO L195 NwaCegarLoop]: trace histogram [617, 617, 612, 612, 497, 497, 308, 308, 308, 308, 308, 308, 308, 306, 306, 306, 306, 306, 306, 306, 191, 189, 120, 115, 1, 1, 1, 1, 1, 1] [2022-11-23 15:25:45,070 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb574073-9495-45bc-a341-0cb647c55fc4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Forceful destruction successful, exit code 0 [2022-11-23 15:25:45,226 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb574073-9495-45bc-a341-0cb647c55fc4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2022-11-23 15:25:45,226 INFO L420 AbstractCegarLoop]: === Iteration 26 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 15:25:45,228 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 15:25:45,228 INFO L85 PathProgramCache]: Analyzing trace with hash -1309044193, now seen corresponding path program 19 times [2022-11-23 15:25:45,229 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 15:25:45,229 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [733931844] [2022-11-23 15:25:45,229 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:25:45,229 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 15:25:53,517 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:27:33,889 INFO L134 CoverageAnalysis]: Checked inductivity of 2130292 backedges. 22380 proven. 44065 refuted. 0 times theorem prover too weak. 2063847 trivial. 0 not checked. [2022-11-23 15:27:33,889 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 15:27:33,889 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [733931844] [2022-11-23 15:27:33,889 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [733931844] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 15:27:33,889 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [928714610] [2022-11-23 15:27:33,890 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-23 15:27:33,890 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:27:33,890 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb574073-9495-45bc-a341-0cb647c55fc4/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 15:27:33,892 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb574073-9495-45bc-a341-0cb647c55fc4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 15:27:33,893 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb574073-9495-45bc-a341-0cb647c55fc4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2022-11-23 15:27:37,727 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:27:37,803 INFO L263 TraceCheckSpWp]: Trace formula consists of 18611 conjuncts, 30 conjunts are in the unsatisfiable core [2022-11-23 15:27:37,865 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 15:27:38,478 INFO L134 CoverageAnalysis]: Checked inductivity of 2130292 backedges. 5216 proven. 42971 refuted. 0 times theorem prover too weak. 2082105 trivial. 0 not checked. [2022-11-23 15:27:38,478 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 15:28:15,221 INFO L134 CoverageAnalysis]: Checked inductivity of 2130292 backedges. 5216 proven. 43091 refuted. 0 times theorem prover too weak. 2081985 trivial. 0 not checked. [2022-11-23 15:28:15,221 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [928714610] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 15:28:15,221 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [619820000] [2022-11-23 15:28:15,224 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2022-11-23 15:28:15,224 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 15:28:15,224 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:336) 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) [2022-11-23 15:28:15,224 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 15:28:15,227 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 19, 31] total 52 [2022-11-23 15:28:15,227 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [329075960] [2022-11-23 15:28:15,227 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 15:28:15,232 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 52 states [2022-11-23 15:28:15,232 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 15:28:15,233 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2022-11-23 15:28:15,233 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=274, Invalid=2378, Unknown=0, NotChecked=0, Total=2652 [2022-11-23 15:28:15,235 INFO L87 Difference]: Start difference. First operand 375 states and 536 transitions. Second operand has 52 states, 51 states have (on average 3.215686274509804) internal successors, (164), 52 states have internal predecessors, (164), 45 states have call successors, (52), 1 states have call predecessors, (52), 29 states have return successors, (76), 31 states have call predecessors, (76), 45 states have call successors, (76) [2022-11-23 15:28:20,559 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 15:28:20,559 INFO L93 Difference]: Finished difference Result 938 states and 1775 transitions. [2022-11-23 15:28:20,560 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 96 states. [2022-11-23 15:28:20,560 INFO L78 Accepts]: Start accepts. Automaton has has 52 states, 51 states have (on average 3.215686274509804) internal successors, (164), 52 states have internal predecessors, (164), 45 states have call successors, (52), 1 states have call predecessors, (52), 29 states have return successors, (76), 31 states have call predecessors, (76), 45 states have call successors, (76) Word has length 8371 [2022-11-23 15:28:20,563 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 15:28:20,569 INFO L225 Difference]: With dead ends: 938 [2022-11-23 15:28:20,570 INFO L226 Difference]: Without dead ends: 563 [2022-11-23 15:28:20,575 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 16857 GetRequests, 16716 SyntacticMatches, 15 SemanticMatches, 126 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5111 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=1947, Invalid=14309, Unknown=0, NotChecked=0, Total=16256 [2022-11-23 15:28:20,576 INFO L413 NwaCegarLoop]: 71 mSDtfsCounter, 651 mSDsluCounter, 855 mSDsCounter, 0 mSdLazyCounter, 4736 mSolverCounterSat, 1585 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 652 SdHoareTripleChecker+Valid, 926 SdHoareTripleChecker+Invalid, 6321 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1585 IncrementalHoareTripleChecker+Valid, 4736 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.4s IncrementalHoareTripleChecker+Time [2022-11-23 15:28:20,576 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [652 Valid, 926 Invalid, 6321 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1585 Valid, 4736 Invalid, 0 Unknown, 0 Unchecked, 3.4s Time] [2022-11-23 15:28:20,577 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 563 states. [2022-11-23 15:28:20,650 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 563 to 450. [2022-11-23 15:28:20,651 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 450 states, 320 states have (on average 1.03125) internal successors, (330), 313 states have internal predecessors, (330), 98 states have call successors, (98), 77 states have call predecessors, (98), 31 states have return successors, (233), 59 states have call predecessors, (233), 98 states have call successors, (233) [2022-11-23 15:28:20,654 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 450 states to 450 states and 661 transitions. [2022-11-23 15:28:20,655 INFO L78 Accepts]: Start accepts. Automaton has 450 states and 661 transitions. Word has length 8371 [2022-11-23 15:28:20,656 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 15:28:20,656 INFO L495 AbstractCegarLoop]: Abstraction has 450 states and 661 transitions. [2022-11-23 15:28:20,657 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 52 states, 51 states have (on average 3.215686274509804) internal successors, (164), 52 states have internal predecessors, (164), 45 states have call successors, (52), 1 states have call predecessors, (52), 29 states have return successors, (76), 31 states have call predecessors, (76), 45 states have call successors, (76) [2022-11-23 15:28:20,657 INFO L276 IsEmpty]: Start isEmpty. Operand 450 states and 661 transitions. [2022-11-23 15:28:24,118 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21895 [2022-11-23 15:28:24,118 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 15:28:24,122 INFO L195 NwaCegarLoop]: trace histogram [1617, 1617, 1598, 1598, 1304, 1297, 808, 808, 808, 808, 808, 808, 808, 799, 799, 799, 799, 799, 799, 799, 498, 496, 320, 294, 1, 1, 1, 1, 1, 1] [2022-11-23 15:28:24,153 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb574073-9495-45bc-a341-0cb647c55fc4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Forceful destruction successful, exit code 0 [2022-11-23 15:28:24,322 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bb574073-9495-45bc-a341-0cb647c55fc4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2022-11-23 15:28:24,323 INFO L420 AbstractCegarLoop]: === Iteration 27 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 15:28:24,326 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 15:28:24,330 INFO L85 PathProgramCache]: Analyzing trace with hash -950742856, now seen corresponding path program 20 times [2022-11-23 15:28:24,330 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 15:28:24,331 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [436576309] [2022-11-23 15:28:24,332 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:28:24,332 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms