./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/recursive-simple/fibo_2calls_8-1.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 2329fc70 Calling Ultimate with: /usr/lib/jvm/java-11-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d5a82beb-1ba2-405b-b61f-de248118d018/bin/utaipan-gh47qXpMRh/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d5a82beb-1ba2-405b-b61f-de248118d018/bin/utaipan-gh47qXpMRh/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d5a82beb-1ba2-405b-b61f-de248118d018/bin/utaipan-gh47qXpMRh/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d5a82beb-1ba2-405b-b61f-de248118d018/bin/utaipan-gh47qXpMRh/config/TaipanReach.xml -i ../../sv-benchmarks/c/recursive-simple/fibo_2calls_8-1.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d5a82beb-1ba2-405b-b61f-de248118d018/bin/utaipan-gh47qXpMRh/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d5a82beb-1ba2-405b-b61f-de248118d018/bin/utaipan-gh47qXpMRh --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 50f60fa428d099767eedeaaecff58f84e68d960030ff43c7eae2dbdfbde6f992 --- Real Ultimate output --- [0.001s][warning][os,container] Duplicate cpuset controllers detected. Picking /sys/fs/cgroup/cpuset, skipping /sys/fs/cgroup/cpuset. This is Ultimate 0.2.2-dev-2329fc7 [2022-12-14 11:38:45,624 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-12-14 11:38:45,626 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-12-14 11:38:45,644 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-12-14 11:38:45,645 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-12-14 11:38:45,646 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-12-14 11:38:45,647 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-12-14 11:38:45,648 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-12-14 11:38:45,650 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-12-14 11:38:45,650 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-12-14 11:38:45,651 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-12-14 11:38:45,652 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-12-14 11:38:45,652 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-12-14 11:38:45,653 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-12-14 11:38:45,654 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-12-14 11:38:45,655 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-12-14 11:38:45,656 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-12-14 11:38:45,657 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-12-14 11:38:45,658 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-12-14 11:38:45,660 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-12-14 11:38:45,661 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-12-14 11:38:45,662 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-12-14 11:38:45,663 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-12-14 11:38:45,664 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-12-14 11:38:45,667 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-12-14 11:38:45,667 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-12-14 11:38:45,667 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-12-14 11:38:45,668 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-12-14 11:38:45,669 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-12-14 11:38:45,669 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-12-14 11:38:45,670 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-12-14 11:38:45,670 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-12-14 11:38:45,671 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-12-14 11:38:45,672 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-12-14 11:38:45,673 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-12-14 11:38:45,673 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-12-14 11:38:45,673 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-12-14 11:38:45,674 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-12-14 11:38:45,674 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-12-14 11:38:45,674 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-12-14 11:38:45,675 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-12-14 11:38:45,676 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d5a82beb-1ba2-405b-b61f-de248118d018/bin/utaipan-gh47qXpMRh/config/svcomp-Reach-32bit-Taipan_Default.epf [2022-12-14 11:38:45,697 INFO L113 SettingsManager]: Loading preferences was successful [2022-12-14 11:38:45,697 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-12-14 11:38:45,697 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-12-14 11:38:45,698 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-12-14 11:38:45,698 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-12-14 11:38:45,698 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-12-14 11:38:45,699 INFO L138 SettingsManager]: * User list type=DISABLED [2022-12-14 11:38:45,699 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-12-14 11:38:45,699 INFO L138 SettingsManager]: * Explicit value domain=true [2022-12-14 11:38:45,699 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-12-14 11:38:45,699 INFO L138 SettingsManager]: * Octagon Domain=false [2022-12-14 11:38:45,699 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-12-14 11:38:45,700 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-12-14 11:38:45,700 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-12-14 11:38:45,700 INFO L138 SettingsManager]: * Interval Domain=false [2022-12-14 11:38:45,700 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-12-14 11:38:45,700 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-12-14 11:38:45,700 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-12-14 11:38:45,701 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-12-14 11:38:45,701 INFO L138 SettingsManager]: * sizeof long=4 [2022-12-14 11:38:45,701 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-12-14 11:38:45,701 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-12-14 11:38:45,702 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-12-14 11:38:45,702 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-12-14 11:38:45,702 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-12-14 11:38:45,702 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-12-14 11:38:45,702 INFO L138 SettingsManager]: * sizeof long double=12 [2022-12-14 11:38:45,702 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-12-14 11:38:45,702 INFO L138 SettingsManager]: * Use constant arrays=true [2022-12-14 11:38:45,703 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-12-14 11:38:45,703 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-12-14 11:38:45,703 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-12-14 11:38:45,703 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-12-14 11:38:45,703 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-12-14 11:38:45,703 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-12-14 11:38:45,704 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-12-14 11:38:45,704 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-12-14 11:38:45,704 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-12-14 11:38:45,704 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-12-14 11:38:45,704 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-12-14 11:38:45,704 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-12-14 11:38:45,705 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_d5a82beb-1ba2-405b-b61f-de248118d018/bin/utaipan-gh47qXpMRh/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d5a82beb-1ba2-405b-b61f-de248118d018/bin/utaipan-gh47qXpMRh Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 50f60fa428d099767eedeaaecff58f84e68d960030ff43c7eae2dbdfbde6f992 [2022-12-14 11:38:45,911 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-12-14 11:38:45,929 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-12-14 11:38:45,931 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-12-14 11:38:45,932 INFO L271 PluginConnector]: Initializing CDTParser... [2022-12-14 11:38:45,933 INFO L275 PluginConnector]: CDTParser initialized [2022-12-14 11:38:45,934 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d5a82beb-1ba2-405b-b61f-de248118d018/bin/utaipan-gh47qXpMRh/../../sv-benchmarks/c/recursive-simple/fibo_2calls_8-1.c [2022-12-14 11:38:48,450 INFO L500 CDTParser]: Created temporary CDT project at NULL [2022-12-14 11:38:48,605 INFO L351 CDTParser]: Found 1 translation units. [2022-12-14 11:38:48,606 INFO L172 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d5a82beb-1ba2-405b-b61f-de248118d018/sv-benchmarks/c/recursive-simple/fibo_2calls_8-1.c [2022-12-14 11:38:48,610 INFO L394 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d5a82beb-1ba2-405b-b61f-de248118d018/bin/utaipan-gh47qXpMRh/data/4008fdad7/05a02c4db4cf450cb109b75c26c08b51/FLAG7db58737c [2022-12-14 11:38:49,026 INFO L402 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d5a82beb-1ba2-405b-b61f-de248118d018/bin/utaipan-gh47qXpMRh/data/4008fdad7/05a02c4db4cf450cb109b75c26c08b51 [2022-12-14 11:38:49,028 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-12-14 11:38:49,029 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-12-14 11:38:49,030 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-12-14 11:38:49,030 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-12-14 11:38:49,033 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-12-14 11:38:49,033 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.12 11:38:49" (1/1) ... [2022-12-14 11:38:49,034 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@67f6da62 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 11:38:49, skipping insertion in model container [2022-12-14 11:38:49,034 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.12 11:38:49" (1/1) ... [2022-12-14 11:38:49,040 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-12-14 11:38:49,049 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-12-14 11:38:49,157 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_d5a82beb-1ba2-405b-b61f-de248118d018/sv-benchmarks/c/recursive-simple/fibo_2calls_8-1.c[947,960] [2022-12-14 11:38:49,161 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-12-14 11:38:49,170 INFO L203 MainTranslator]: Completed pre-run [2022-12-14 11:38:49,184 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_d5a82beb-1ba2-405b-b61f-de248118d018/sv-benchmarks/c/recursive-simple/fibo_2calls_8-1.c[947,960] [2022-12-14 11:38:49,184 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-12-14 11:38:49,197 INFO L208 MainTranslator]: Completed translation [2022-12-14 11:38:49,197 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 11:38:49 WrapperNode [2022-12-14 11:38:49,197 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-12-14 11:38:49,198 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-12-14 11:38:49,198 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-12-14 11:38:49,199 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-12-14 11:38:49,205 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 11:38:49" (1/1) ... [2022-12-14 11:38:49,211 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 11:38:49" (1/1) ... [2022-12-14 11:38:49,225 INFO L138 Inliner]: procedures = 14, calls = 12, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 21 [2022-12-14 11:38:49,226 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-12-14 11:38:49,226 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-12-14 11:38:49,226 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-12-14 11:38:49,227 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-12-14 11:38:49,234 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 11:38:49" (1/1) ... [2022-12-14 11:38:49,234 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 11:38:49" (1/1) ... [2022-12-14 11:38:49,235 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 11:38:49" (1/1) ... [2022-12-14 11:38:49,236 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 11:38:49" (1/1) ... [2022-12-14 11:38:49,238 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 11:38:49" (1/1) ... [2022-12-14 11:38:49,240 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 11:38:49" (1/1) ... [2022-12-14 11:38:49,241 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 11:38:49" (1/1) ... [2022-12-14 11:38:49,242 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 11:38:49" (1/1) ... [2022-12-14 11:38:49,244 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-12-14 11:38:49,245 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-12-14 11:38:49,245 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-12-14 11:38:49,245 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-12-14 11:38:49,246 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 11:38:49" (1/1) ... [2022-12-14 11:38:49,252 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-12-14 11:38:49,261 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d5a82beb-1ba2-405b-b61f-de248118d018/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 11:38:49,272 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d5a82beb-1ba2-405b-b61f-de248118d018/bin/utaipan-gh47qXpMRh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-12-14 11:38:49,274 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d5a82beb-1ba2-405b-b61f-de248118d018/bin/utaipan-gh47qXpMRh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-12-14 11:38:49,306 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-12-14 11:38:49,306 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-12-14 11:38:49,307 INFO L130 BoogieDeclarations]: Found specification of procedure fibo2 [2022-12-14 11:38:49,307 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo2 [2022-12-14 11:38:49,307 INFO L130 BoogieDeclarations]: Found specification of procedure fibo1 [2022-12-14 11:38:49,307 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo1 [2022-12-14 11:38:49,307 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-12-14 11:38:49,307 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-12-14 11:38:49,362 INFO L235 CfgBuilder]: Building ICFG [2022-12-14 11:38:49,364 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-12-14 11:38:49,453 INFO L276 CfgBuilder]: Performing block encoding [2022-12-14 11:38:49,468 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-12-14 11:38:49,468 INFO L300 CfgBuilder]: Removed 0 assume(true) statements. [2022-12-14 11:38:49,471 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.12 11:38:49 BoogieIcfgContainer [2022-12-14 11:38:49,471 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-12-14 11:38:49,474 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-12-14 11:38:49,474 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-12-14 11:38:49,478 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-12-14 11:38:49,478 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 14.12 11:38:49" (1/3) ... [2022-12-14 11:38:49,478 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5535d67b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.12 11:38:49, skipping insertion in model container [2022-12-14 11:38:49,479 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 11:38:49" (2/3) ... [2022-12-14 11:38:49,479 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5535d67b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.12 11:38:49, skipping insertion in model container [2022-12-14 11:38:49,479 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.12 11:38:49" (3/3) ... [2022-12-14 11:38:49,480 INFO L112 eAbstractionObserver]: Analyzing ICFG fibo_2calls_8-1.c [2022-12-14 11:38:49,500 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-12-14 11:38:49,500 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-12-14 11:38:49,550 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-12-14 11:38:49,559 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;@3b8ecd23, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-12-14 11:38:49,559 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-12-14 11:38:49,564 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) [2022-12-14 11:38:49,570 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2022-12-14 11:38:49,571 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 11:38:49,571 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 11:38:49,571 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 11:38:49,575 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 11:38:49,576 INFO L85 PathProgramCache]: Analyzing trace with hash 2097990987, now seen corresponding path program 1 times [2022-12-14 11:38:49,586 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 11:38:49,586 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1461144391] [2022-12-14 11:38:49,587 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 11:38:49,587 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 11:38:49,682 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 11:38:49,785 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 11:38:49,786 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 11:38:49,786 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1461144391] [2022-12-14 11:38:49,787 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1461144391] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 11:38:49,787 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 11:38:49,788 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-12-14 11:38:49,789 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [15495066] [2022-12-14 11:38:49,790 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 11:38:49,795 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-12-14 11:38:49,795 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 11:38:49,827 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-12-14 11:38:49,828 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-12-14 11:38:49,830 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) [2022-12-14 11:38:49,909 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 11:38:49,909 INFO L93 Difference]: Finished difference Result 34 states and 43 transitions. [2022-12-14 11:38:49,911 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-12-14 11:38:49,912 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 [2022-12-14 11:38:49,912 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 11:38:49,918 INFO L225 Difference]: With dead ends: 34 [2022-12-14 11:38:49,918 INFO L226 Difference]: Without dead ends: 26 [2022-12-14 11:38:49,920 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 [2022-12-14 11:38:49,922 INFO L413 NwaCegarLoop]: 23 mSDtfsCounter, 13 mSDsluCounter, 43 mSDsCounter, 0 mSdLazyCounter, 44 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s 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, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 11:38:49,923 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [16 Valid, 66 Invalid, 44 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 44 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 11:38:49,936 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2022-12-14 11:38:49,951 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2022-12-14 11:38:49,952 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) [2022-12-14 11:38:49,952 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 33 transitions. [2022-12-14 11:38:49,953 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 33 transitions. Word has length 9 [2022-12-14 11:38:49,954 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 11:38:49,954 INFO L495 AbstractCegarLoop]: Abstraction has 26 states and 33 transitions. [2022-12-14 11:38:49,954 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) [2022-12-14 11:38:49,954 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 33 transitions. [2022-12-14 11:38:49,955 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2022-12-14 11:38:49,955 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 11:38:49,955 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 11:38:49,955 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-12-14 11:38:49,956 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 11:38:49,956 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 11:38:49,956 INFO L85 PathProgramCache]: Analyzing trace with hash 1328370967, now seen corresponding path program 1 times [2022-12-14 11:38:49,956 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 11:38:49,957 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1205720269] [2022-12-14 11:38:49,957 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 11:38:49,957 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 11:38:49,965 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 11:38:50,006 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 11:38:50,007 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 11:38:50,007 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1205720269] [2022-12-14 11:38:50,007 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1205720269] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 11:38:50,007 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 11:38:50,007 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-12-14 11:38:50,008 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [419275081] [2022-12-14 11:38:50,008 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 11:38:50,009 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-12-14 11:38:50,009 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 11:38:50,010 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-12-14 11:38:50,010 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-12-14 11:38:50,010 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) [2022-12-14 11:38:50,058 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 11:38:50,068 INFO L93 Difference]: Finished difference Result 32 states and 40 transitions. [2022-12-14 11:38:50,070 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-12-14 11:38:50,070 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 [2022-12-14 11:38:50,070 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 11:38:50,071 INFO L225 Difference]: With dead ends: 32 [2022-12-14 11:38:50,072 INFO L226 Difference]: Without dead ends: 28 [2022-12-14 11:38:50,072 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 [2022-12-14 11:38:50,073 INFO L413 NwaCegarLoop]: 22 mSDtfsCounter, 10 mSDsluCounter, 41 mSDsCounter, 0 mSdLazyCounter, 40 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s 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, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 11:38:50,074 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [13 Valid, 63 Invalid, 41 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 40 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 11:38:50,075 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2022-12-14 11:38:50,080 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 26. [2022-12-14 11:38:50,080 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) [2022-12-14 11:38:50,081 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 33 transitions. [2022-12-14 11:38:50,081 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 33 transitions. Word has length 10 [2022-12-14 11:38:50,081 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 11:38:50,081 INFO L495 AbstractCegarLoop]: Abstraction has 26 states and 33 transitions. [2022-12-14 11:38:50,082 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) [2022-12-14 11:38:50,082 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 33 transitions. [2022-12-14 11:38:50,082 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2022-12-14 11:38:50,082 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 11:38:50,082 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 11:38:50,083 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-12-14 11:38:50,083 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 11:38:50,083 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 11:38:50,083 INFO L85 PathProgramCache]: Analyzing trace with hash -1296553538, now seen corresponding path program 1 times [2022-12-14 11:38:50,083 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 11:38:50,083 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1599918353] [2022-12-14 11:38:50,083 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 11:38:50,084 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 11:38:50,094 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 11:38:50,164 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-12-14 11:38:50,164 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 11:38:50,164 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1599918353] [2022-12-14 11:38:50,165 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1599918353] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 11:38:50,165 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1368926279] [2022-12-14 11:38:50,165 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 11:38:50,165 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 11:38:50,165 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d5a82beb-1ba2-405b-b61f-de248118d018/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 11:38:50,166 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d5a82beb-1ba2-405b-b61f-de248118d018/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 11:38:50,167 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d5a82beb-1ba2-405b-b61f-de248118d018/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-12-14 11:38:50,208 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 11:38:50,210 INFO L263 TraceCheckSpWp]: Trace formula consists of 74 conjuncts, 6 conjunts are in the unsatisfiable core [2022-12-14 11:38:50,215 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 11:38:50,291 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-12-14 11:38:50,291 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 11:38:50,444 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-12-14 11:38:50,445 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1368926279] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 11:38:50,445 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [604921634] [2022-12-14 11:38:50,463 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2022-12-14 11:38:50,464 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 11:38:50,467 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 11:38:50,472 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 11:38:50,472 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 11:38:50,538 INFO L197 IcfgInterpreter]: Interpreting procedure fibo1 with input of size 39 for LOIs [2022-12-14 11:38:50,579 INFO L197 IcfgInterpreter]: Interpreting procedure fibo2 with input of size 39 for LOIs [2022-12-14 11:38:50,586 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 11:38:50,816 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSifa [604921634] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 11:38:50,816 INFO L184 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2022-12-14 11:38:50,817 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [6, 7, 7] total 17 [2022-12-14 11:38:50,817 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1143202539] [2022-12-14 11:38:50,818 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 11:38:50,818 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-12-14 11:38:50,818 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 11:38:50,819 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-12-14 11:38:50,819 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=224, Unknown=0, NotChecked=0, Total=272 [2022-12-14 11:38:50,820 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) [2022-12-14 11:38:50,901 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 11:38:50,901 INFO L93 Difference]: Finished difference Result 68 states and 91 transitions. [2022-12-14 11:38:50,901 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-12-14 11:38:50,902 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 [2022-12-14 11:38:50,902 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 11:38:50,903 INFO L225 Difference]: With dead ends: 68 [2022-12-14 11:38:50,903 INFO L226 Difference]: Without dead ends: 44 [2022-12-14 11:38:50,904 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 52 SyntacticMatches, 4 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 53 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=48, Invalid=224, Unknown=0, NotChecked=0, Total=272 [2022-12-14 11:38:50,905 INFO L413 NwaCegarLoop]: 30 mSDtfsCounter, 19 mSDsluCounter, 62 mSDsCounter, 0 mSdLazyCounter, 52 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 24 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 [2022-12-14 11:38:50,906 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [24 Valid, 92 Invalid, 59 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 52 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 11:38:50,907 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2022-12-14 11:38:50,916 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 42. [2022-12-14 11:38:50,916 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) [2022-12-14 11:38:50,918 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 50 transitions. [2022-12-14 11:38:50,918 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 50 transitions. Word has length 22 [2022-12-14 11:38:50,918 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 11:38:50,919 INFO L495 AbstractCegarLoop]: Abstraction has 42 states and 50 transitions. [2022-12-14 11:38:50,919 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) [2022-12-14 11:38:50,919 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 50 transitions. [2022-12-14 11:38:50,921 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2022-12-14 11:38:50,921 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 11:38:50,921 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] [2022-12-14 11:38:50,928 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d5a82beb-1ba2-405b-b61f-de248118d018/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-12-14 11:38:51,122 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d5a82beb-1ba2-405b-b61f-de248118d018/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 11:38:51,122 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 11:38:51,123 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 11:38:51,123 INFO L85 PathProgramCache]: Analyzing trace with hash -28918515, now seen corresponding path program 1 times [2022-12-14 11:38:51,123 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 11:38:51,123 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [764158410] [2022-12-14 11:38:51,123 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 11:38:51,124 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 11:38:51,142 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 11:38:51,230 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 5 proven. 5 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-12-14 11:38:51,230 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 11:38:51,231 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [764158410] [2022-12-14 11:38:51,231 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [764158410] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 11:38:51,231 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1333493444] [2022-12-14 11:38:51,231 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 11:38:51,231 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 11:38:51,232 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d5a82beb-1ba2-405b-b61f-de248118d018/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 11:38:51,232 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d5a82beb-1ba2-405b-b61f-de248118d018/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 11:38:51,233 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d5a82beb-1ba2-405b-b61f-de248118d018/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-12-14 11:38:51,272 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 11:38:51,273 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 8 conjunts are in the unsatisfiable core [2022-12-14 11:38:51,275 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 11:38:51,327 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2022-12-14 11:38:51,327 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 11:38:51,559 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 2 proven. 10 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-12-14 11:38:51,560 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1333493444] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 11:38:51,560 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1958104097] [2022-12-14 11:38:51,561 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2022-12-14 11:38:51,562 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 11:38:51,562 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-12-14 11:38:51,564 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 11:38:51,564 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 8, 9] total 14 [2022-12-14 11:38:51,564 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [395512608] [2022-12-14 11:38:51,564 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 11:38:51,565 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-12-14 11:38:51,565 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 11:38:51,565 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-12-14 11:38:51,565 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2022-12-14 11:38:51,566 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) [2022-12-14 11:38:51,720 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 11:38:51,720 INFO L93 Difference]: Finished difference Result 85 states and 121 transitions. [2022-12-14 11:38:51,721 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-12-14 11:38:51,721 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 [2022-12-14 11:38:51,721 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 11:38:51,723 INFO L225 Difference]: With dead ends: 85 [2022-12-14 11:38:51,723 INFO L226 Difference]: Without dead ends: 53 [2022-12-14 11:38:51,724 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 63 SyntacticMatches, 3 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=75, Invalid=305, Unknown=0, NotChecked=0, Total=380 [2022-12-14 11:38:51,724 INFO L413 NwaCegarLoop]: 18 mSDtfsCounter, 33 mSDsluCounter, 77 mSDsCounter, 0 mSdLazyCounter, 204 mSolverCounterSat, 26 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 38 SdHoareTripleChecker+Valid, 95 SdHoareTripleChecker+Invalid, 230 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 26 IncrementalHoareTripleChecker+Valid, 204 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 11:38:51,725 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [38 Valid, 95 Invalid, 230 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [26 Valid, 204 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 11:38:51,725 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2022-12-14 11:38:51,731 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 44. [2022-12-14 11:38:51,731 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) [2022-12-14 11:38:51,732 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 53 transitions. [2022-12-14 11:38:51,732 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 53 transitions. Word has length 35 [2022-12-14 11:38:51,732 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 11:38:51,732 INFO L495 AbstractCegarLoop]: Abstraction has 44 states and 53 transitions. [2022-12-14 11:38:51,733 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) [2022-12-14 11:38:51,733 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 53 transitions. [2022-12-14 11:38:51,734 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2022-12-14 11:38:51,734 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 11:38:51,735 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] [2022-12-14 11:38:51,739 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d5a82beb-1ba2-405b-b61f-de248118d018/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2022-12-14 11:38:51,935 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d5a82beb-1ba2-405b-b61f-de248118d018/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 11:38:51,937 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 11:38:51,938 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 11:38:51,938 INFO L85 PathProgramCache]: Analyzing trace with hash -243412115, now seen corresponding path program 1 times [2022-12-14 11:38:51,938 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 11:38:51,939 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1896321582] [2022-12-14 11:38:51,939 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 11:38:51,940 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 11:38:51,971 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 11:38:52,146 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 4 proven. 3 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-12-14 11:38:52,146 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 11:38:52,146 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1896321582] [2022-12-14 11:38:52,147 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1896321582] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 11:38:52,147 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1122759958] [2022-12-14 11:38:52,147 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 11:38:52,147 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 11:38:52,147 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d5a82beb-1ba2-405b-b61f-de248118d018/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 11:38:52,148 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d5a82beb-1ba2-405b-b61f-de248118d018/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 11:38:52,149 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d5a82beb-1ba2-405b-b61f-de248118d018/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-12-14 11:38:52,185 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 11:38:52,185 INFO L263 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 8 conjunts are in the unsatisfiable core [2022-12-14 11:38:52,187 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 11:38:52,250 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-12-14 11:38:52,250 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 11:38:52,488 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 2 proven. 11 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-12-14 11:38:52,488 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1122759958] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 11:38:52,488 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2117170246] [2022-12-14 11:38:52,490 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2022-12-14 11:38:52,490 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 11:38:52,490 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-12-14 11:38:52,490 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 11:38:52,490 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8, 9] total 18 [2022-12-14 11:38:52,490 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2077235642] [2022-12-14 11:38:52,491 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 11:38:52,491 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2022-12-14 11:38:52,491 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 11:38:52,492 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2022-12-14 11:38:52,492 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=257, Unknown=0, NotChecked=0, Total=306 [2022-12-14 11:38:52,492 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) [2022-12-14 11:38:52,823 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 11:38:52,823 INFO L93 Difference]: Finished difference Result 121 states and 203 transitions. [2022-12-14 11:38:52,823 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2022-12-14 11:38:52,824 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 [2022-12-14 11:38:52,824 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 11:38:52,827 INFO L225 Difference]: With dead ends: 121 [2022-12-14 11:38:52,827 INFO L226 Difference]: Without dead ends: 77 [2022-12-14 11:38:52,828 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 68 SyntacticMatches, 3 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 125 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=142, Invalid=670, Unknown=0, NotChecked=0, Total=812 [2022-12-14 11:38:52,829 INFO L413 NwaCegarLoop]: 27 mSDtfsCounter, 52 mSDsluCounter, 139 mSDsCounter, 0 mSdLazyCounter, 420 mSolverCounterSat, 71 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 56 SdHoareTripleChecker+Valid, 166 SdHoareTripleChecker+Invalid, 491 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 71 IncrementalHoareTripleChecker+Valid, 420 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-12-14 11:38:52,829 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [56 Valid, 166 Invalid, 491 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [71 Valid, 420 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-12-14 11:38:52,829 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2022-12-14 11:38:52,838 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 63. [2022-12-14 11:38:52,839 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) [2022-12-14 11:38:52,839 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 91 transitions. [2022-12-14 11:38:52,840 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 91 transitions. Word has length 36 [2022-12-14 11:38:52,840 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 11:38:52,840 INFO L495 AbstractCegarLoop]: Abstraction has 63 states and 91 transitions. [2022-12-14 11:38:52,840 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) [2022-12-14 11:38:52,840 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 91 transitions. [2022-12-14 11:38:52,841 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2022-12-14 11:38:52,841 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 11:38:52,841 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] [2022-12-14 11:38:52,847 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d5a82beb-1ba2-405b-b61f-de248118d018/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2022-12-14 11:38:53,042 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d5a82beb-1ba2-405b-b61f-de248118d018/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 11:38:53,043 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 11:38:53,044 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 11:38:53,045 INFO L85 PathProgramCache]: Analyzing trace with hash 403750738, now seen corresponding path program 1 times [2022-12-14 11:38:53,045 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 11:38:53,045 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1479420845] [2022-12-14 11:38:53,046 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 11:38:53,046 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 11:38:53,082 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 11:38:53,251 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 12 proven. 12 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2022-12-14 11:38:53,251 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 11:38:53,251 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1479420845] [2022-12-14 11:38:53,252 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1479420845] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 11:38:53,252 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [140551609] [2022-12-14 11:38:53,252 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 11:38:53,252 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 11:38:53,252 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d5a82beb-1ba2-405b-b61f-de248118d018/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 11:38:53,253 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d5a82beb-1ba2-405b-b61f-de248118d018/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 11:38:53,254 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d5a82beb-1ba2-405b-b61f-de248118d018/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-12-14 11:38:53,298 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 11:38:53,299 INFO L263 TraceCheckSpWp]: Trace formula consists of 136 conjuncts, 10 conjunts are in the unsatisfiable core [2022-12-14 11:38:53,301 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 11:38:53,360 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 4 proven. 23 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2022-12-14 11:38:53,360 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 11:38:53,707 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 4 proven. 28 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-12-14 11:38:53,707 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [140551609] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 11:38:53,707 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1624412511] [2022-12-14 11:38:53,710 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2022-12-14 11:38:53,710 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 11:38:53,710 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-12-14 11:38:53,710 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 11:38:53,710 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9, 11] total 17 [2022-12-14 11:38:53,711 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1392142402] [2022-12-14 11:38:53,711 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 11:38:53,711 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2022-12-14 11:38:53,712 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 11:38:53,712 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2022-12-14 11:38:53,713 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2022-12-14 11:38:53,713 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) [2022-12-14 11:38:53,863 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 11:38:53,864 INFO L93 Difference]: Finished difference Result 119 states and 203 transitions. [2022-12-14 11:38:53,864 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-12-14 11:38:53,864 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 [2022-12-14 11:38:53,864 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 11:38:53,865 INFO L225 Difference]: With dead ends: 119 [2022-12-14 11:38:53,865 INFO L226 Difference]: Without dead ends: 97 [2022-12-14 11:38:53,866 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 117 GetRequests, 91 SyntacticMatches, 4 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 108 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=115, Invalid=437, Unknown=0, NotChecked=0, Total=552 [2022-12-14 11:38:53,867 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 41 mSDsluCounter, 57 mSDsCounter, 0 mSdLazyCounter, 138 mSolverCounterSat, 51 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 53 SdHoareTripleChecker+Valid, 73 SdHoareTripleChecker+Invalid, 189 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 51 IncrementalHoareTripleChecker+Valid, 138 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 11:38:53,867 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [53 Valid, 73 Invalid, 189 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [51 Valid, 138 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 11:38:53,867 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2022-12-14 11:38:53,876 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 72. [2022-12-14 11:38:53,877 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) [2022-12-14 11:38:53,877 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 105 transitions. [2022-12-14 11:38:53,878 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 105 transitions. Word has length 50 [2022-12-14 11:38:53,878 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 11:38:53,878 INFO L495 AbstractCegarLoop]: Abstraction has 72 states and 105 transitions. [2022-12-14 11:38:53,878 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) [2022-12-14 11:38:53,878 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 105 transitions. [2022-12-14 11:38:53,880 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2022-12-14 11:38:53,880 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 11:38:53,880 INFO L195 NwaCegarLoop]: trace histogram [7, 7, 6, 6, 6, 5, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 11:38:53,885 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d5a82beb-1ba2-405b-b61f-de248118d018/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2022-12-14 11:38:54,081 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d5a82beb-1ba2-405b-b61f-de248118d018/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2022-12-14 11:38:54,082 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 11:38:54,083 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 11:38:54,083 INFO L85 PathProgramCache]: Analyzing trace with hash -1002637961, now seen corresponding path program 1 times [2022-12-14 11:38:54,084 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 11:38:54,084 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1530148339] [2022-12-14 11:38:54,084 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 11:38:54,085 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 11:38:54,132 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 11:38:54,358 INFO L134 CoverageAnalysis]: Checked inductivity of 193 backedges. 40 proven. 59 refuted. 0 times theorem prover too weak. 94 trivial. 0 not checked. [2022-12-14 11:38:54,358 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 11:38:54,359 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1530148339] [2022-12-14 11:38:54,359 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1530148339] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 11:38:54,359 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1598322568] [2022-12-14 11:38:54,359 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 11:38:54,359 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 11:38:54,359 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d5a82beb-1ba2-405b-b61f-de248118d018/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 11:38:54,360 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d5a82beb-1ba2-405b-b61f-de248118d018/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 11:38:54,361 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d5a82beb-1ba2-405b-b61f-de248118d018/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-12-14 11:38:54,415 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 11:38:54,417 INFO L263 TraceCheckSpWp]: Trace formula consists of 229 conjuncts, 12 conjunts are in the unsatisfiable core [2022-12-14 11:38:54,418 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 11:38:54,510 INFO L134 CoverageAnalysis]: Checked inductivity of 193 backedges. 13 proven. 92 refuted. 0 times theorem prover too weak. 88 trivial. 0 not checked. [2022-12-14 11:38:54,510 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 11:38:55,065 INFO L134 CoverageAnalysis]: Checked inductivity of 193 backedges. 13 proven. 102 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2022-12-14 11:38:55,066 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1598322568] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 11:38:55,066 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [777454452] [2022-12-14 11:38:55,067 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2022-12-14 11:38:55,067 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 11:38:55,067 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-12-14 11:38:55,068 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 11:38:55,068 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10, 13] total 23 [2022-12-14 11:38:55,068 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2118301121] [2022-12-14 11:38:55,068 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 11:38:55,069 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2022-12-14 11:38:55,069 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 11:38:55,069 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2022-12-14 11:38:55,070 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=439, Unknown=0, NotChecked=0, Total=506 [2022-12-14 11:38:55,070 INFO L87 Difference]: Start difference. First operand 72 states and 105 transitions. Second operand has 23 states, 21 states have (on average 3.5714285714285716) internal successors, (75), 23 states have internal predecessors, (75), 18 states have call successors, (23), 1 states have call predecessors, (23), 9 states have return successors, (27), 10 states have call predecessors, (27), 18 states have call successors, (27) [2022-12-14 11:38:55,558 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 11:38:55,558 INFO L93 Difference]: Finished difference Result 204 states and 411 transitions. [2022-12-14 11:38:55,559 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2022-12-14 11:38:55,559 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 21 states have (on average 3.5714285714285716) internal successors, (75), 23 states have internal predecessors, (75), 18 states have call successors, (23), 1 states have call predecessors, (23), 9 states have return successors, (27), 10 states have call predecessors, (27), 18 states have call successors, (27) Word has length 92 [2022-12-14 11:38:55,559 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 11:38:55,561 INFO L225 Difference]: With dead ends: 204 [2022-12-14 11:38:55,562 INFO L226 Difference]: Without dead ends: 115 [2022-12-14 11:38:55,563 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 210 GetRequests, 167 SyntacticMatches, 5 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 252 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=263, Invalid=1297, Unknown=0, NotChecked=0, Total=1560 [2022-12-14 11:38:55,564 INFO L413 NwaCegarLoop]: 35 mSDtfsCounter, 81 mSDsluCounter, 237 mSDsCounter, 0 mSdLazyCounter, 763 mSolverCounterSat, 131 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 82 SdHoareTripleChecker+Valid, 272 SdHoareTripleChecker+Invalid, 894 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 131 IncrementalHoareTripleChecker+Valid, 763 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-12-14 11:38:55,564 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [82 Valid, 272 Invalid, 894 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [131 Valid, 763 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-12-14 11:38:55,565 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 115 states. [2022-12-14 11:38:55,580 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 115 to 98. [2022-12-14 11:38:55,581 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) [2022-12-14 11:38:55,582 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 144 transitions. [2022-12-14 11:38:55,583 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 144 transitions. Word has length 92 [2022-12-14 11:38:55,583 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 11:38:55,583 INFO L495 AbstractCegarLoop]: Abstraction has 98 states and 144 transitions. [2022-12-14 11:38:55,583 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 21 states have (on average 3.5714285714285716) internal successors, (75), 23 states have internal predecessors, (75), 18 states have call successors, (23), 1 states have call predecessors, (23), 9 states have return successors, (27), 10 states have call predecessors, (27), 18 states have call successors, (27) [2022-12-14 11:38:55,583 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 144 transitions. [2022-12-14 11:38:55,587 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 185 [2022-12-14 11:38:55,587 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 11:38:55,587 INFO L195 NwaCegarLoop]: trace histogram [14, 14, 13, 13, 10, 9, 7, 7, 7, 7, 7, 7, 7, 6, 6, 6, 6, 6, 6, 6, 4, 4, 4, 2, 1, 1, 1, 1, 1, 1] [2022-12-14 11:38:55,592 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d5a82beb-1ba2-405b-b61f-de248118d018/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2022-12-14 11:38:55,788 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d5a82beb-1ba2-405b-b61f-de248118d018/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2022-12-14 11:38:55,789 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 11:38:55,789 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 11:38:55,790 INFO L85 PathProgramCache]: Analyzing trace with hash -937472044, now seen corresponding path program 2 times [2022-12-14 11:38:55,790 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 11:38:55,790 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1083678354] [2022-12-14 11:38:55,791 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 11:38:55,791 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 11:38:55,850 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 11:38:55,969 INFO L134 CoverageAnalysis]: Checked inductivity of 901 backedges. 49 proven. 168 refuted. 0 times theorem prover too weak. 684 trivial. 0 not checked. [2022-12-14 11:38:55,969 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 11:38:55,970 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1083678354] [2022-12-14 11:38:55,970 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1083678354] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 11:38:55,970 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1743258941] [2022-12-14 11:38:55,970 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 11:38:55,970 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 11:38:55,970 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d5a82beb-1ba2-405b-b61f-de248118d018/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 11:38:55,971 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d5a82beb-1ba2-405b-b61f-de248118d018/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 11:38:55,972 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d5a82beb-1ba2-405b-b61f-de248118d018/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-12-14 11:38:56,043 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2022-12-14 11:38:56,044 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 11:38:56,045 INFO L263 TraceCheckSpWp]: Trace formula consists of 226 conjuncts, 12 conjunts are in the unsatisfiable core [2022-12-14 11:38:56,049 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 11:38:56,155 INFO L134 CoverageAnalysis]: Checked inductivity of 901 backedges. 293 proven. 38 refuted. 0 times theorem prover too weak. 570 trivial. 0 not checked. [2022-12-14 11:38:56,155 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 11:38:56,725 INFO L134 CoverageAnalysis]: Checked inductivity of 901 backedges. 293 proven. 39 refuted. 0 times theorem prover too weak. 569 trivial. 0 not checked. [2022-12-14 11:38:56,725 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1743258941] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 11:38:56,725 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [34848301] [2022-12-14 11:38:56,727 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2022-12-14 11:38:56,728 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 11:38:56,728 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-12-14 11:38:56,728 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 11:38:56,728 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 12, 13] total 20 [2022-12-14 11:38:56,729 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1909740593] [2022-12-14 11:38:56,729 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 11:38:56,730 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2022-12-14 11:38:56,730 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 11:38:56,731 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2022-12-14 11:38:56,731 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=328, Unknown=0, NotChecked=0, Total=380 [2022-12-14 11:38:56,731 INFO L87 Difference]: Start difference. First operand 98 states and 144 transitions. Second operand has 20 states, 19 states have (on average 3.736842105263158) internal successors, (71), 20 states have internal predecessors, (71), 12 states have call successors, (19), 1 states have call predecessors, (19), 8 states have return successors, (23), 8 states have call predecessors, (23), 12 states have call successors, (23) [2022-12-14 11:38:57,005 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 11:38:57,005 INFO L93 Difference]: Finished difference Result 226 states and 409 transitions. [2022-12-14 11:38:57,006 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2022-12-14 11:38:57,006 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 19 states have (on average 3.736842105263158) internal successors, (71), 20 states have internal predecessors, (71), 12 states have call successors, (19), 1 states have call predecessors, (19), 8 states have return successors, (23), 8 states have call predecessors, (23), 12 states have call successors, (23) Word has length 184 [2022-12-14 11:38:57,006 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 11:38:57,008 INFO L225 Difference]: With dead ends: 226 [2022-12-14 11:38:57,008 INFO L226 Difference]: Without dead ends: 124 [2022-12-14 11:38:57,009 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 386 GetRequests, 349 SyntacticMatches, 6 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 125 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=196, Invalid=860, Unknown=0, NotChecked=0, Total=1056 [2022-12-14 11:38:57,010 INFO L413 NwaCegarLoop]: 27 mSDtfsCounter, 81 mSDsluCounter, 136 mSDsCounter, 0 mSdLazyCounter, 362 mSolverCounterSat, 119 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 81 SdHoareTripleChecker+Valid, 163 SdHoareTripleChecker+Invalid, 481 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 119 IncrementalHoareTripleChecker+Valid, 362 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 11:38:57,010 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [81 Valid, 163 Invalid, 481 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [119 Valid, 362 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 11:38:57,011 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2022-12-14 11:38:57,025 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 111. [2022-12-14 11:38:57,026 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 111 states, 72 states have (on average 1.1805555555555556) internal successors, (85), 75 states have internal predecessors, (85), 22 states have call successors, (22), 9 states have call predecessors, (22), 16 states have return successors, (55), 26 states have call predecessors, (55), 22 states have call successors, (55) [2022-12-14 11:38:57,027 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 111 states to 111 states and 162 transitions. [2022-12-14 11:38:57,027 INFO L78 Accepts]: Start accepts. Automaton has 111 states and 162 transitions. Word has length 184 [2022-12-14 11:38:57,028 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 11:38:57,028 INFO L495 AbstractCegarLoop]: Abstraction has 111 states and 162 transitions. [2022-12-14 11:38:57,028 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 19 states have (on average 3.736842105263158) internal successors, (71), 20 states have internal predecessors, (71), 12 states have call successors, (19), 1 states have call predecessors, (19), 8 states have return successors, (23), 8 states have call predecessors, (23), 12 states have call successors, (23) [2022-12-14 11:38:57,028 INFO L276 IsEmpty]: Start isEmpty. Operand 111 states and 162 transitions. [2022-12-14 11:38:57,031 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 146 [2022-12-14 11:38:57,031 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 11:38:57,031 INFO L195 NwaCegarLoop]: trace histogram [12, 12, 9, 9, 9, 7, 6, 6, 6, 6, 6, 6, 6, 5, 4, 4, 4, 4, 4, 4, 4, 3, 2, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 11:38:57,035 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d5a82beb-1ba2-405b-b61f-de248118d018/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2022-12-14 11:38:57,232 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d5a82beb-1ba2-405b-b61f-de248118d018/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 11:38:57,233 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 11:38:57,234 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 11:38:57,235 INFO L85 PathProgramCache]: Analyzing trace with hash 1728273241, now seen corresponding path program 3 times [2022-12-14 11:38:57,235 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 11:38:57,236 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [907439983] [2022-12-14 11:38:57,236 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 11:38:57,237 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 11:38:57,315 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 11:38:57,486 INFO L134 CoverageAnalysis]: Checked inductivity of 549 backedges. 42 proven. 158 refuted. 0 times theorem prover too weak. 349 trivial. 0 not checked. [2022-12-14 11:38:57,486 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 11:38:57,486 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [907439983] [2022-12-14 11:38:57,486 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [907439983] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 11:38:57,486 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [326428857] [2022-12-14 11:38:57,486 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 11:38:57,487 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 11:38:57,487 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d5a82beb-1ba2-405b-b61f-de248118d018/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 11:38:57,487 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d5a82beb-1ba2-405b-b61f-de248118d018/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 11:38:57,488 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d5a82beb-1ba2-405b-b61f-de248118d018/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-12-14 11:38:57,559 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 11:38:57,559 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 11:38:57,560 INFO L263 TraceCheckSpWp]: Trace formula consists of 257 conjuncts, 8 conjunts are in the unsatisfiable core [2022-12-14 11:38:57,562 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 11:38:57,617 INFO L134 CoverageAnalysis]: Checked inductivity of 549 backedges. 248 proven. 6 refuted. 0 times theorem prover too weak. 295 trivial. 0 not checked. [2022-12-14 11:38:57,617 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 11:38:58,053 INFO L134 CoverageAnalysis]: Checked inductivity of 549 backedges. 57 proven. 143 refuted. 0 times theorem prover too weak. 349 trivial. 0 not checked. [2022-12-14 11:38:58,054 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [326428857] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 11:38:58,054 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [668781499] [2022-12-14 11:38:58,056 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2022-12-14 11:38:58,056 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 11:38:58,056 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-12-14 11:38:58,056 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 11:38:58,056 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9, 9] total 18 [2022-12-14 11:38:58,057 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1140247693] [2022-12-14 11:38:58,057 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 11:38:58,057 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2022-12-14 11:38:58,057 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 11:38:58,057 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2022-12-14 11:38:58,057 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=263, Unknown=0, NotChecked=0, Total=306 [2022-12-14 11:38:58,058 INFO L87 Difference]: Start difference. First operand 111 states and 162 transitions. Second operand has 18 states, 17 states have (on average 4.411764705882353) internal successors, (75), 18 states have internal predecessors, (75), 12 states have call successors, (22), 2 states have call predecessors, (22), 9 states have return successors, (27), 9 states have call predecessors, (27), 12 states have call successors, (27) [2022-12-14 11:38:58,389 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 11:38:58,389 INFO L93 Difference]: Finished difference Result 244 states and 384 transitions. [2022-12-14 11:38:58,390 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2022-12-14 11:38:58,390 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 17 states have (on average 4.411764705882353) internal successors, (75), 18 states have internal predecessors, (75), 12 states have call successors, (22), 2 states have call predecessors, (22), 9 states have return successors, (27), 9 states have call predecessors, (27), 12 states have call successors, (27) Word has length 145 [2022-12-14 11:38:58,390 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 11:38:58,392 INFO L225 Difference]: With dead ends: 244 [2022-12-14 11:38:58,392 INFO L226 Difference]: Without dead ends: 143 [2022-12-14 11:38:58,393 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 315 GetRequests, 281 SyntacticMatches, 4 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 120 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=173, Invalid=819, Unknown=0, NotChecked=0, Total=992 [2022-12-14 11:38:58,394 INFO L413 NwaCegarLoop]: 24 mSDtfsCounter, 85 mSDsluCounter, 128 mSDsCounter, 0 mSdLazyCounter, 465 mSolverCounterSat, 84 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 86 SdHoareTripleChecker+Valid, 152 SdHoareTripleChecker+Invalid, 549 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 84 IncrementalHoareTripleChecker+Valid, 465 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-12-14 11:38:58,394 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [86 Valid, 152 Invalid, 549 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [84 Valid, 465 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-12-14 11:38:58,394 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 143 states. [2022-12-14 11:38:58,408 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 143 to 106. [2022-12-14 11:38:58,409 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 106 states, 69 states have (on average 1.1884057971014492) internal successors, (82), 71 states have internal predecessors, (82), 22 states have call successors, (22), 9 states have call predecessors, (22), 14 states have return successors, (50), 25 states have call predecessors, (50), 22 states have call successors, (50) [2022-12-14 11:38:58,410 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 154 transitions. [2022-12-14 11:38:58,410 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 154 transitions. Word has length 145 [2022-12-14 11:38:58,411 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 11:38:58,411 INFO L495 AbstractCegarLoop]: Abstraction has 106 states and 154 transitions. [2022-12-14 11:38:58,411 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 17 states have (on average 4.411764705882353) internal successors, (75), 18 states have internal predecessors, (75), 12 states have call successors, (22), 2 states have call predecessors, (22), 9 states have return successors, (27), 9 states have call predecessors, (27), 12 states have call successors, (27) [2022-12-14 11:38:58,411 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 154 transitions. [2022-12-14 11:38:58,414 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 188 [2022-12-14 11:38:58,414 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 11:38:58,414 INFO L195 NwaCegarLoop]: trace histogram [14, 14, 13, 13, 11, 11, 7, 7, 7, 7, 7, 7, 7, 6, 6, 6, 6, 6, 6, 6, 5, 4, 3, 2, 1, 1, 1, 1, 1, 1] [2022-12-14 11:38:58,418 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d5a82beb-1ba2-405b-b61f-de248118d018/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2022-12-14 11:38:58,614 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d5a82beb-1ba2-405b-b61f-de248118d018/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 11:38:58,616 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 11:38:58,616 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 11:38:58,617 INFO L85 PathProgramCache]: Analyzing trace with hash -5508006, now seen corresponding path program 4 times [2022-12-14 11:38:58,617 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 11:38:58,617 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [362704401] [2022-12-14 11:38:58,618 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 11:38:58,618 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 11:38:58,660 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 11:38:58,833 INFO L134 CoverageAnalysis]: Checked inductivity of 930 backedges. 75 proven. 209 refuted. 0 times theorem prover too weak. 646 trivial. 0 not checked. [2022-12-14 11:38:58,833 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 11:38:58,833 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [362704401] [2022-12-14 11:38:58,834 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [362704401] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 11:38:58,834 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [972203104] [2022-12-14 11:38:58,834 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 11:38:58,834 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 11:38:58,834 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d5a82beb-1ba2-405b-b61f-de248118d018/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 11:38:58,835 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d5a82beb-1ba2-405b-b61f-de248118d018/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 11:38:58,836 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d5a82beb-1ba2-405b-b61f-de248118d018/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-12-14 11:38:58,909 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 11:38:58,911 INFO L263 TraceCheckSpWp]: Trace formula consists of 440 conjuncts, 14 conjunts are in the unsatisfiable core [2022-12-14 11:38:58,913 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 11:38:59,009 INFO L134 CoverageAnalysis]: Checked inductivity of 930 backedges. 38 proven. 303 refuted. 0 times theorem prover too weak. 589 trivial. 0 not checked. [2022-12-14 11:38:59,009 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 11:38:59,930 INFO L134 CoverageAnalysis]: Checked inductivity of 930 backedges. 38 proven. 319 refuted. 0 times theorem prover too weak. 573 trivial. 0 not checked. [2022-12-14 11:38:59,930 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [972203104] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 11:38:59,930 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [395875358] [2022-12-14 11:38:59,931 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2022-12-14 11:38:59,931 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 11:38:59,931 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-12-14 11:38:59,931 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 11:38:59,931 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 15] total 25 [2022-12-14 11:38:59,932 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1677142543] [2022-12-14 11:38:59,932 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 11:38:59,932 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2022-12-14 11:38:59,932 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 11:38:59,933 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2022-12-14 11:38:59,933 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=523, Unknown=0, NotChecked=0, Total=600 [2022-12-14 11:38:59,933 INFO L87 Difference]: Start difference. First operand 106 states and 154 transitions. Second operand has 25 states, 23 states have (on average 3.5652173913043477) internal successors, (82), 25 states have internal predecessors, (82), 20 states have call successors, (26), 1 states have call predecessors, (26), 10 states have return successors, (32), 11 states have call predecessors, (32), 20 states have call successors, (32) [2022-12-14 11:39:00,511 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 11:39:00,512 INFO L93 Difference]: Finished difference Result 261 states and 464 transitions. [2022-12-14 11:39:00,512 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2022-12-14 11:39:00,512 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 23 states have (on average 3.5652173913043477) internal successors, (82), 25 states have internal predecessors, (82), 20 states have call successors, (26), 1 states have call predecessors, (26), 10 states have return successors, (32), 11 states have call predecessors, (32), 20 states have call successors, (32) Word has length 187 [2022-12-14 11:39:00,512 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 11:39:00,513 INFO L225 Difference]: With dead ends: 261 [2022-12-14 11:39:00,513 INFO L226 Difference]: Without dead ends: 135 [2022-12-14 11:39:00,515 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 402 GetRequests, 354 SyntacticMatches, 6 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 325 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=321, Invalid=1571, Unknown=0, NotChecked=0, Total=1892 [2022-12-14 11:39:00,515 INFO L413 NwaCegarLoop]: 33 mSDtfsCounter, 127 mSDsluCounter, 220 mSDsCounter, 0 mSdLazyCounter, 736 mSolverCounterSat, 218 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 128 SdHoareTripleChecker+Valid, 253 SdHoareTripleChecker+Invalid, 954 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 218 IncrementalHoareTripleChecker+Valid, 736 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-12-14 11:39:00,515 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [128 Valid, 253 Invalid, 954 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [218 Valid, 736 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-12-14 11:39:00,516 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 135 states. [2022-12-14 11:39:00,523 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 135 to 115. [2022-12-14 11:39:00,523 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 115 states, 76 states have (on average 1.2105263157894737) internal successors, (92), 78 states have internal predecessors, (92), 23 states have call successors, (23), 11 states have call predecessors, (23), 15 states have return successors, (56), 25 states have call predecessors, (56), 23 states have call successors, (56) [2022-12-14 11:39:00,524 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 171 transitions. [2022-12-14 11:39:00,524 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 171 transitions. Word has length 187 [2022-12-14 11:39:00,524 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 11:39:00,524 INFO L495 AbstractCegarLoop]: Abstraction has 115 states and 171 transitions. [2022-12-14 11:39:00,524 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 23 states have (on average 3.5652173913043477) internal successors, (82), 25 states have internal predecessors, (82), 20 states have call successors, (26), 1 states have call predecessors, (26), 10 states have return successors, (32), 11 states have call predecessors, (32), 20 states have call successors, (32) [2022-12-14 11:39:00,524 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 171 transitions. [2022-12-14 11:39:00,527 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 255 [2022-12-14 11:39:00,527 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 11:39:00,527 INFO L195 NwaCegarLoop]: trace histogram [19, 19, 18, 18, 15, 14, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 6, 5, 4, 4, 1, 1, 1, 1, 1, 1] [2022-12-14 11:39:00,533 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d5a82beb-1ba2-405b-b61f-de248118d018/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Ended with exit code 0 [2022-12-14 11:39:00,727 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d5a82beb-1ba2-405b-b61f-de248118d018/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2022-12-14 11:39:00,728 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 11:39:00,728 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 11:39:00,728 INFO L85 PathProgramCache]: Analyzing trace with hash 854846097, now seen corresponding path program 5 times [2022-12-14 11:39:00,728 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 11:39:00,728 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1102227660] [2022-12-14 11:39:00,728 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 11:39:00,728 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 11:39:00,748 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 11:39:01,002 INFO L134 CoverageAnalysis]: Checked inductivity of 1780 backedges. 153 proven. 416 refuted. 0 times theorem prover too weak. 1211 trivial. 0 not checked. [2022-12-14 11:39:01,002 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 11:39:01,002 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1102227660] [2022-12-14 11:39:01,002 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1102227660] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 11:39:01,003 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2051272224] [2022-12-14 11:39:01,003 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 11:39:01,003 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 11:39:01,003 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d5a82beb-1ba2-405b-b61f-de248118d018/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 11:39:01,004 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d5a82beb-1ba2-405b-b61f-de248118d018/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 11:39:01,005 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d5a82beb-1ba2-405b-b61f-de248118d018/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-12-14 11:39:01,091 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2022-12-14 11:39:01,091 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 11:39:01,092 INFO L263 TraceCheckSpWp]: Trace formula consists of 226 conjuncts, 12 conjunts are in the unsatisfiable core [2022-12-14 11:39:01,096 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 11:39:01,188 INFO L134 CoverageAnalysis]: Checked inductivity of 1780 backedges. 460 proven. 33 refuted. 0 times theorem prover too weak. 1287 trivial. 0 not checked. [2022-12-14 11:39:01,188 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 11:39:01,865 INFO L134 CoverageAnalysis]: Checked inductivity of 1780 backedges. 460 proven. 35 refuted. 0 times theorem prover too weak. 1285 trivial. 0 not checked. [2022-12-14 11:39:01,865 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2051272224] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 11:39:01,865 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [175206741] [2022-12-14 11:39:01,867 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2022-12-14 11:39:01,867 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 11:39:01,868 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-12-14 11:39:01,868 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 11:39:01,868 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 12, 13] total 25 [2022-12-14 11:39:01,868 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [131913190] [2022-12-14 11:39:01,868 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 11:39:01,869 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2022-12-14 11:39:01,869 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 11:39:01,870 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2022-12-14 11:39:01,870 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=521, Unknown=0, NotChecked=0, Total=600 [2022-12-14 11:39:01,871 INFO L87 Difference]: Start difference. First operand 115 states and 171 transitions. Second operand has 25 states, 25 states have (on average 3.36) internal successors, (84), 25 states have internal predecessors, (84), 17 states have call successors, (25), 1 states have call predecessors, (25), 11 states have return successors, (32), 13 states have call predecessors, (32), 17 states have call successors, (32) [2022-12-14 11:39:02,176 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 11:39:02,176 INFO L93 Difference]: Finished difference Result 242 states and 419 transitions. [2022-12-14 11:39:02,176 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2022-12-14 11:39:02,177 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 3.36) internal successors, (84), 25 states have internal predecessors, (84), 17 states have call successors, (25), 1 states have call predecessors, (25), 11 states have return successors, (32), 13 states have call predecessors, (32), 17 states have call successors, (32) Word has length 254 [2022-12-14 11:39:02,177 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 11:39:02,179 INFO L225 Difference]: With dead ends: 242 [2022-12-14 11:39:02,179 INFO L226 Difference]: Without dead ends: 135 [2022-12-14 11:39:02,180 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 537 GetRequests, 492 SyntacticMatches, 6 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 326 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=264, Invalid=1376, Unknown=0, NotChecked=0, Total=1640 [2022-12-14 11:39:02,181 INFO L413 NwaCegarLoop]: 37 mSDtfsCounter, 76 mSDsluCounter, 198 mSDsCounter, 0 mSdLazyCounter, 469 mSolverCounterSat, 90 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 76 SdHoareTripleChecker+Valid, 235 SdHoareTripleChecker+Invalid, 559 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 90 IncrementalHoareTripleChecker+Valid, 469 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 11:39:02,181 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [76 Valid, 235 Invalid, 559 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [90 Valid, 469 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 11:39:02,182 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 135 states. [2022-12-14 11:39:02,195 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 135 to 135. [2022-12-14 11:39:02,195 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 135 states, 94 states have (on average 1.1170212765957446) internal successors, (105), 91 states have internal predecessors, (105), 25 states have call successors, (25), 18 states have call predecessors, (25), 15 states have return successors, (54), 25 states have call predecessors, (54), 25 states have call successors, (54) [2022-12-14 11:39:02,196 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 135 states to 135 states and 184 transitions. [2022-12-14 11:39:02,196 INFO L78 Accepts]: Start accepts. Automaton has 135 states and 184 transitions. Word has length 254 [2022-12-14 11:39:02,196 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 11:39:02,196 INFO L495 AbstractCegarLoop]: Abstraction has 135 states and 184 transitions. [2022-12-14 11:39:02,197 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 3.36) internal successors, (84), 25 states have internal predecessors, (84), 17 states have call successors, (25), 1 states have call predecessors, (25), 11 states have return successors, (32), 13 states have call predecessors, (32), 17 states have call successors, (32) [2022-12-14 11:39:02,197 INFO L276 IsEmpty]: Start isEmpty. Operand 135 states and 184 transitions. [2022-12-14 11:39:02,199 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 256 [2022-12-14 11:39:02,199 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 11:39:02,199 INFO L195 NwaCegarLoop]: trace histogram [19, 19, 18, 18, 15, 15, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 6, 6, 4, 3, 1, 1, 1, 1, 1, 1] [2022-12-14 11:39:02,204 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d5a82beb-1ba2-405b-b61f-de248118d018/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Ended with exit code 0 [2022-12-14 11:39:02,399 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d5a82beb-1ba2-405b-b61f-de248118d018/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2022-12-14 11:39:02,400 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 11:39:02,400 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 11:39:02,400 INFO L85 PathProgramCache]: Analyzing trace with hash 868279213, now seen corresponding path program 6 times [2022-12-14 11:39:02,400 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 11:39:02,401 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1014448373] [2022-12-14 11:39:02,401 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 11:39:02,401 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 11:39:02,455 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 11:39:02,749 INFO L134 CoverageAnalysis]: Checked inductivity of 1794 backedges. 187 proven. 420 refuted. 0 times theorem prover too weak. 1187 trivial. 0 not checked. [2022-12-14 11:39:02,749 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 11:39:02,750 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1014448373] [2022-12-14 11:39:02,750 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1014448373] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 11:39:02,750 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [884313285] [2022-12-14 11:39:02,750 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 11:39:02,750 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 11:39:02,750 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d5a82beb-1ba2-405b-b61f-de248118d018/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 11:39:02,751 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d5a82beb-1ba2-405b-b61f-de248118d018/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 11:39:02,752 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d5a82beb-1ba2-405b-b61f-de248118d018/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-12-14 11:39:02,838 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 11:39:02,838 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 11:39:02,840 INFO L263 TraceCheckSpWp]: Trace formula consists of 453 conjuncts, 18 conjunts are in the unsatisfiable core [2022-12-14 11:39:02,843 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 11:39:02,936 INFO L134 CoverageAnalysis]: Checked inductivity of 1794 backedges. 1060 proven. 176 refuted. 0 times theorem prover too weak. 558 trivial. 0 not checked. [2022-12-14 11:39:02,937 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 11:39:04,181 INFO L134 CoverageAnalysis]: Checked inductivity of 1794 backedges. 202 proven. 533 refuted. 0 times theorem prover too weak. 1059 trivial. 0 not checked. [2022-12-14 11:39:04,181 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [884313285] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 11:39:04,181 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1789684879] [2022-12-14 11:39:04,182 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2022-12-14 11:39:04,182 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 11:39:04,182 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-12-14 11:39:04,182 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 11:39:04,182 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15, 19] total 27 [2022-12-14 11:39:04,183 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1474968222] [2022-12-14 11:39:04,183 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 11:39:04,183 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2022-12-14 11:39:04,183 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 11:39:04,184 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2022-12-14 11:39:04,184 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=610, Unknown=0, NotChecked=0, Total=702 [2022-12-14 11:39:04,184 INFO L87 Difference]: Start difference. First operand 135 states and 184 transitions. Second operand has 27 states, 27 states have (on average 3.7777777777777777) internal successors, (102), 27 states have internal predecessors, (102), 20 states have call successors, (30), 2 states have call predecessors, (30), 11 states have return successors, (35), 11 states have call predecessors, (35), 20 states have call successors, (35) [2022-12-14 11:39:04,631 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 11:39:04,631 INFO L93 Difference]: Finished difference Result 266 states and 372 transitions. [2022-12-14 11:39:04,632 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2022-12-14 11:39:04,632 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 3.7777777777777777) internal successors, (102), 27 states have internal predecessors, (102), 20 states have call successors, (30), 2 states have call predecessors, (30), 11 states have return successors, (35), 11 states have call predecessors, (35), 20 states have call successors, (35) Word has length 255 [2022-12-14 11:39:04,632 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 11:39:04,634 INFO L225 Difference]: With dead ends: 266 [2022-12-14 11:39:04,634 INFO L226 Difference]: Without dead ends: 141 [2022-12-14 11:39:04,636 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 541 GetRequests, 491 SyntacticMatches, 9 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 394 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=300, Invalid=1506, Unknown=0, NotChecked=0, Total=1806 [2022-12-14 11:39:04,636 INFO L413 NwaCegarLoop]: 35 mSDtfsCounter, 82 mSDsluCounter, 241 mSDsCounter, 0 mSdLazyCounter, 590 mSolverCounterSat, 99 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 82 SdHoareTripleChecker+Valid, 276 SdHoareTripleChecker+Invalid, 689 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 99 IncrementalHoareTripleChecker+Valid, 590 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-12-14 11:39:04,636 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [82 Valid, 276 Invalid, 689 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [99 Valid, 590 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-12-14 11:39:04,637 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 141 states. [2022-12-14 11:39:04,642 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 141 to 135. [2022-12-14 11:39:04,643 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 135 states, 94 states have (on average 1.1170212765957446) internal successors, (105), 91 states have internal predecessors, (105), 25 states have call successors, (25), 18 states have call predecessors, (25), 15 states have return successors, (51), 25 states have call predecessors, (51), 25 states have call successors, (51) [2022-12-14 11:39:04,643 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 135 states to 135 states and 181 transitions. [2022-12-14 11:39:04,644 INFO L78 Accepts]: Start accepts. Automaton has 135 states and 181 transitions. Word has length 255 [2022-12-14 11:39:04,644 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 11:39:04,644 INFO L495 AbstractCegarLoop]: Abstraction has 135 states and 181 transitions. [2022-12-14 11:39:04,644 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 27 states have (on average 3.7777777777777777) internal successors, (102), 27 states have internal predecessors, (102), 20 states have call successors, (30), 2 states have call predecessors, (30), 11 states have return successors, (35), 11 states have call predecessors, (35), 20 states have call successors, (35) [2022-12-14 11:39:04,644 INFO L276 IsEmpty]: Start isEmpty. Operand 135 states and 181 transitions. [2022-12-14 11:39:04,646 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 242 [2022-12-14 11:39:04,646 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 11:39:04,646 INFO L195 NwaCegarLoop]: trace histogram [18, 18, 17, 17, 14, 14, 9, 9, 9, 9, 9, 9, 9, 8, 8, 8, 8, 8, 8, 8, 6, 5, 4, 3, 1, 1, 1, 1, 1, 1] [2022-12-14 11:39:04,650 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d5a82beb-1ba2-405b-b61f-de248118d018/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Ended with exit code 0 [2022-12-14 11:39:04,846 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d5a82beb-1ba2-405b-b61f-de248118d018/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 11:39:04,847 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 11:39:04,847 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 11:39:04,847 INFO L85 PathProgramCache]: Analyzing trace with hash 117861336, now seen corresponding path program 7 times [2022-12-14 11:39:04,847 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 11:39:04,847 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1246060234] [2022-12-14 11:39:04,847 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 11:39:04,848 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 11:39:04,864 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 11:39:05,124 INFO L134 CoverageAnalysis]: Checked inductivity of 1594 backedges. 281 proven. 375 refuted. 0 times theorem prover too weak. 938 trivial. 0 not checked. [2022-12-14 11:39:05,125 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 11:39:05,125 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1246060234] [2022-12-14 11:39:05,125 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1246060234] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 11:39:05,125 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1941359595] [2022-12-14 11:39:05,125 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 11:39:05,125 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 11:39:05,125 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d5a82beb-1ba2-405b-b61f-de248118d018/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 11:39:05,126 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d5a82beb-1ba2-405b-b61f-de248118d018/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 11:39:05,131 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d5a82beb-1ba2-405b-b61f-de248118d018/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-12-14 11:39:05,215 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 11:39:05,217 INFO L263 TraceCheckSpWp]: Trace formula consists of 560 conjuncts, 16 conjunts are in the unsatisfiable core [2022-12-14 11:39:05,219 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 11:39:05,300 INFO L134 CoverageAnalysis]: Checked inductivity of 1594 backedges. 85 proven. 447 refuted. 0 times theorem prover too weak. 1062 trivial. 0 not checked. [2022-12-14 11:39:05,300 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 11:39:06,357 INFO L134 CoverageAnalysis]: Checked inductivity of 1594 backedges. 85 proven. 471 refuted. 0 times theorem prover too weak. 1038 trivial. 0 not checked. [2022-12-14 11:39:06,357 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1941359595] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 11:39:06,358 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [335289211] [2022-12-14 11:39:06,359 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2022-12-14 11:39:06,359 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 11:39:06,359 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-12-14 11:39:06,359 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 11:39:06,359 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 12, 17] total 31 [2022-12-14 11:39:06,359 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1347660565] [2022-12-14 11:39:06,360 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 11:39:06,365 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2022-12-14 11:39:06,365 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 11:39:06,366 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2022-12-14 11:39:06,366 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=110, Invalid=820, Unknown=0, NotChecked=0, Total=930 [2022-12-14 11:39:06,366 INFO L87 Difference]: Start difference. First operand 135 states and 181 transitions. Second operand has 31 states, 30 states have (on average 3.2666666666666666) internal successors, (98), 31 states have internal predecessors, (98), 24 states have call successors, (30), 1 states have call predecessors, (30), 15 states have return successors, (38), 16 states have call predecessors, (38), 24 states have call successors, (38) [2022-12-14 11:39:07,244 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 11:39:07,244 INFO L93 Difference]: Finished difference Result 337 states and 531 transitions. [2022-12-14 11:39:07,244 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2022-12-14 11:39:07,245 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 30 states have (on average 3.2666666666666666) internal successors, (98), 31 states have internal predecessors, (98), 24 states have call successors, (30), 1 states have call predecessors, (30), 15 states have return successors, (38), 16 states have call predecessors, (38), 24 states have call successors, (38) Word has length 241 [2022-12-14 11:39:07,245 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 11:39:07,246 INFO L225 Difference]: With dead ends: 337 [2022-12-14 11:39:07,246 INFO L226 Difference]: Without dead ends: 194 [2022-12-14 11:39:07,248 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 534 GetRequests, 464 SyntacticMatches, 8 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1034 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=587, Invalid=3445, Unknown=0, NotChecked=0, Total=4032 [2022-12-14 11:39:07,248 INFO L413 NwaCegarLoop]: 42 mSDtfsCounter, 151 mSDsluCounter, 303 mSDsCounter, 0 mSdLazyCounter, 1202 mSolverCounterSat, 339 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 152 SdHoareTripleChecker+Valid, 345 SdHoareTripleChecker+Invalid, 1541 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 339 IncrementalHoareTripleChecker+Valid, 1202 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-12-14 11:39:07,248 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [152 Valid, 345 Invalid, 1541 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [339 Valid, 1202 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-12-14 11:39:07,249 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 194 states. [2022-12-14 11:39:07,263 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 194 to 161. [2022-12-14 11:39:07,263 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 161 states, 112 states have (on average 1.0982142857142858) internal successors, (123), 109 states have internal predecessors, (123), 31 states have call successors, (31), 22 states have call predecessors, (31), 17 states have return successors, (63), 29 states have call predecessors, (63), 31 states have call successors, (63) [2022-12-14 11:39:07,264 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 161 states to 161 states and 217 transitions. [2022-12-14 11:39:07,264 INFO L78 Accepts]: Start accepts. Automaton has 161 states and 217 transitions. Word has length 241 [2022-12-14 11:39:07,265 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 11:39:07,265 INFO L495 AbstractCegarLoop]: Abstraction has 161 states and 217 transitions. [2022-12-14 11:39:07,265 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 30 states have (on average 3.2666666666666666) internal successors, (98), 31 states have internal predecessors, (98), 24 states have call successors, (30), 1 states have call predecessors, (30), 15 states have return successors, (38), 16 states have call predecessors, (38), 24 states have call successors, (38) [2022-12-14 11:39:07,265 INFO L276 IsEmpty]: Start isEmpty. Operand 161 states and 217 transitions. [2022-12-14 11:39:07,268 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 597 [2022-12-14 11:39:07,268 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 11:39:07,268 INFO L195 NwaCegarLoop]: trace histogram [45, 45, 42, 42, 37, 34, 22, 22, 22, 22, 22, 22, 22, 21, 21, 21, 21, 21, 21, 21, 16, 12, 8, 8, 1, 1, 1, 1, 1, 1] [2022-12-14 11:39:07,274 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d5a82beb-1ba2-405b-b61f-de248118d018/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Ended with exit code 0 [2022-12-14 11:39:07,468 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d5a82beb-1ba2-405b-b61f-de248118d018/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 11:39:07,469 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 11:39:07,469 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 11:39:07,469 INFO L85 PathProgramCache]: Analyzing trace with hash 1677962036, now seen corresponding path program 8 times [2022-12-14 11:39:07,469 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 11:39:07,469 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1393632691] [2022-12-14 11:39:07,469 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 11:39:07,469 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 11:39:07,522 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 11:39:07,904 INFO L134 CoverageAnalysis]: Checked inductivity of 10395 backedges. 285 proven. 825 refuted. 0 times theorem prover too weak. 9285 trivial. 0 not checked. [2022-12-14 11:39:07,904 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 11:39:07,904 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1393632691] [2022-12-14 11:39:07,904 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1393632691] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 11:39:07,905 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1510424565] [2022-12-14 11:39:07,905 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 11:39:07,905 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 11:39:07,905 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d5a82beb-1ba2-405b-b61f-de248118d018/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 11:39:07,906 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d5a82beb-1ba2-405b-b61f-de248118d018/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 11:39:07,906 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d5a82beb-1ba2-405b-b61f-de248118d018/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2022-12-14 11:39:08,046 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2022-12-14 11:39:08,046 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 11:39:08,048 INFO L263 TraceCheckSpWp]: Trace formula consists of 379 conjuncts, 14 conjunts are in the unsatisfiable core [2022-12-14 11:39:08,053 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 11:39:08,146 INFO L134 CoverageAnalysis]: Checked inductivity of 10395 backedges. 1513 proven. 78 refuted. 0 times theorem prover too weak. 8804 trivial. 0 not checked. [2022-12-14 11:39:08,146 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 11:39:09,472 INFO L134 CoverageAnalysis]: Checked inductivity of 10395 backedges. 1513 proven. 83 refuted. 0 times theorem prover too weak. 8799 trivial. 0 not checked. [2022-12-14 11:39:09,472 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1510424565] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 11:39:09,472 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1191432768] [2022-12-14 11:39:09,474 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2022-12-14 11:39:09,474 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 11:39:09,474 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-12-14 11:39:09,475 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 11:39:09,475 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13, 15] total 23 [2022-12-14 11:39:09,475 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1313768695] [2022-12-14 11:39:09,475 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 11:39:09,476 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2022-12-14 11:39:09,476 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 11:39:09,477 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2022-12-14 11:39:09,477 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=64, Invalid=442, Unknown=0, NotChecked=0, Total=506 [2022-12-14 11:39:09,477 INFO L87 Difference]: Start difference. First operand 161 states and 217 transitions. Second operand has 23 states, 22 states have (on average 3.772727272727273) internal successors, (83), 23 states have internal predecessors, (83), 15 states have call successors, (24), 1 states have call predecessors, (24), 11 states have return successors, (30), 15 states have call predecessors, (30), 15 states have call successors, (30) [2022-12-14 11:39:09,977 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 11:39:09,977 INFO L93 Difference]: Finished difference Result 330 states and 469 transitions. [2022-12-14 11:39:09,978 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2022-12-14 11:39:09,978 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 22 states have (on average 3.772727272727273) internal successors, (83), 23 states have internal predecessors, (83), 15 states have call successors, (24), 1 states have call predecessors, (24), 11 states have return successors, (30), 15 states have call predecessors, (30), 15 states have call successors, (30) Word has length 596 [2022-12-14 11:39:09,978 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 11:39:09,979 INFO L225 Difference]: With dead ends: 330 [2022-12-14 11:39:09,980 INFO L226 Difference]: Without dead ends: 179 [2022-12-14 11:39:09,981 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1224 GetRequests, 1175 SyntacticMatches, 7 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 333 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=307, Invalid=1585, Unknown=0, NotChecked=0, Total=1892 [2022-12-14 11:39:09,981 INFO L413 NwaCegarLoop]: 30 mSDtfsCounter, 90 mSDsluCounter, 215 mSDsCounter, 0 mSdLazyCounter, 844 mSolverCounterSat, 112 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 91 SdHoareTripleChecker+Valid, 245 SdHoareTripleChecker+Invalid, 956 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 112 IncrementalHoareTripleChecker+Valid, 844 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-12-14 11:39:09,982 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [91 Valid, 245 Invalid, 956 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [112 Valid, 844 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-12-14 11:39:09,982 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 179 states. [2022-12-14 11:39:09,995 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 179 to 169. [2022-12-14 11:39:09,996 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 169 states, 118 states have (on average 1.0932203389830508) internal successors, (129), 115 states have internal predecessors, (129), 33 states have call successors, (33), 24 states have call predecessors, (33), 17 states have return successors, (70), 29 states have call predecessors, (70), 33 states have call successors, (70) [2022-12-14 11:39:09,997 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 169 states to 169 states and 232 transitions. [2022-12-14 11:39:09,997 INFO L78 Accepts]: Start accepts. Automaton has 169 states and 232 transitions. Word has length 596 [2022-12-14 11:39:09,998 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 11:39:09,998 INFO L495 AbstractCegarLoop]: Abstraction has 169 states and 232 transitions. [2022-12-14 11:39:09,998 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 22 states have (on average 3.772727272727273) internal successors, (83), 23 states have internal predecessors, (83), 15 states have call successors, (24), 1 states have call predecessors, (24), 11 states have return successors, (30), 15 states have call predecessors, (30), 15 states have call successors, (30) [2022-12-14 11:39:09,998 INFO L276 IsEmpty]: Start isEmpty. Operand 169 states and 232 transitions. [2022-12-14 11:39:10,003 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 637 [2022-12-14 11:39:10,003 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 11:39:10,003 INFO L195 NwaCegarLoop]: trace histogram [47, 47, 46, 46, 38, 37, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 15, 14, 9, 9, 1, 1, 1, 1, 1, 1] [2022-12-14 11:39:10,008 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d5a82beb-1ba2-405b-b61f-de248118d018/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2022-12-14 11:39:10,204 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d5a82beb-1ba2-405b-b61f-de248118d018/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2022-12-14 11:39:10,204 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 11:39:10,204 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 11:39:10,204 INFO L85 PathProgramCache]: Analyzing trace with hash 466605039, now seen corresponding path program 9 times [2022-12-14 11:39:10,205 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 11:39:10,205 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [425628284] [2022-12-14 11:39:10,205 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 11:39:10,205 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 11:39:10,267 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 11:39:10,823 INFO L134 CoverageAnalysis]: Checked inductivity of 11857 backedges. 668 proven. 838 refuted. 0 times theorem prover too weak. 10351 trivial. 0 not checked. [2022-12-14 11:39:10,823 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 11:39:10,823 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [425628284] [2022-12-14 11:39:10,823 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [425628284] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 11:39:10,823 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [351297832] [2022-12-14 11:39:10,823 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 11:39:10,823 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 11:39:10,824 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d5a82beb-1ba2-405b-b61f-de248118d018/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 11:39:10,824 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d5a82beb-1ba2-405b-b61f-de248118d018/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 11:39:10,825 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d5a82beb-1ba2-405b-b61f-de248118d018/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2022-12-14 11:39:11,017 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 11:39:11,017 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 11:39:11,022 INFO L263 TraceCheckSpWp]: Trace formula consists of 1131 conjuncts, 26 conjunts are in the unsatisfiable core [2022-12-14 11:39:11,028 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 11:39:11,212 INFO L134 CoverageAnalysis]: Checked inductivity of 11857 backedges. 5399 proven. 1420 refuted. 0 times theorem prover too weak. 5038 trivial. 0 not checked. [2022-12-14 11:39:11,212 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 11:39:13,663 INFO L134 CoverageAnalysis]: Checked inductivity of 11857 backedges. 741 proven. 2340 refuted. 0 times theorem prover too weak. 8776 trivial. 0 not checked. [2022-12-14 11:39:13,663 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [351297832] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 11:39:13,663 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [282271880] [2022-12-14 11:39:13,665 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2022-12-14 11:39:13,665 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 11:39:13,665 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-12-14 11:39:13,666 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 11:39:13,666 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 19, 27] total 38 [2022-12-14 11:39:13,666 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [929010885] [2022-12-14 11:39:13,667 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 11:39:13,668 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2022-12-14 11:39:13,668 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 11:39:13,668 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2022-12-14 11:39:13,669 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=153, Invalid=1253, Unknown=0, NotChecked=0, Total=1406 [2022-12-14 11:39:13,669 INFO L87 Difference]: Start difference. First operand 169 states and 232 transitions. Second operand has 38 states, 37 states have (on average 3.6486486486486487) internal successors, (135), 38 states have internal predecessors, (135), 31 states have call successors, (43), 2 states have call predecessors, (43), 17 states have return successors, (54), 20 states have call predecessors, (54), 31 states have call successors, (54) [2022-12-14 11:39:14,751 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 11:39:14,751 INFO L93 Difference]: Finished difference Result 449 states and 753 transitions. [2022-12-14 11:39:14,752 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2022-12-14 11:39:14,752 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 37 states have (on average 3.6486486486486487) internal successors, (135), 38 states have internal predecessors, (135), 31 states have call successors, (43), 2 states have call predecessors, (43), 17 states have return successors, (54), 20 states have call predecessors, (54), 31 states have call successors, (54) Word has length 636 [2022-12-14 11:39:14,752 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 11:39:14,755 INFO L225 Difference]: With dead ends: 449 [2022-12-14 11:39:14,755 INFO L226 Difference]: Without dead ends: 229 [2022-12-14 11:39:14,758 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1324 GetRequests, 1238 SyntacticMatches, 13 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1470 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=799, Invalid=4751, Unknown=0, NotChecked=0, Total=5550 [2022-12-14 11:39:14,759 INFO L413 NwaCegarLoop]: 50 mSDtfsCounter, 221 mSDsluCounter, 391 mSDsCounter, 0 mSdLazyCounter, 1584 mSolverCounterSat, 503 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 222 SdHoareTripleChecker+Valid, 441 SdHoareTripleChecker+Invalid, 2087 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 503 IncrementalHoareTripleChecker+Valid, 1584 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-12-14 11:39:14,759 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [222 Valid, 441 Invalid, 2087 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [503 Valid, 1584 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-12-14 11:39:14,760 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 229 states. [2022-12-14 11:39:14,770 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 229 to 190. [2022-12-14 11:39:14,770 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 190 states, 133 states have (on average 1.0676691729323309) internal successors, (142), 129 states have internal predecessors, (142), 38 states have call successors, (38), 28 states have call predecessors, (38), 18 states have return successors, (73), 32 states have call predecessors, (73), 38 states have call successors, (73) [2022-12-14 11:39:14,771 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 190 states to 190 states and 253 transitions. [2022-12-14 11:39:14,771 INFO L78 Accepts]: Start accepts. Automaton has 190 states and 253 transitions. Word has length 636 [2022-12-14 11:39:14,771 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 11:39:14,771 INFO L495 AbstractCegarLoop]: Abstraction has 190 states and 253 transitions. [2022-12-14 11:39:14,772 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 37 states have (on average 3.6486486486486487) internal successors, (135), 38 states have internal predecessors, (135), 31 states have call successors, (43), 2 states have call predecessors, (43), 17 states have return successors, (54), 20 states have call predecessors, (54), 31 states have call successors, (54) [2022-12-14 11:39:14,772 INFO L276 IsEmpty]: Start isEmpty. Operand 190 states and 253 transitions. [2022-12-14 11:39:14,774 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 487 [2022-12-14 11:39:14,774 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 11:39:14,775 INFO L195 NwaCegarLoop]: trace histogram [37, 37, 34, 34, 29, 28, 18, 18, 18, 18, 18, 18, 18, 17, 17, 17, 17, 17, 17, 17, 12, 10, 8, 6, 1, 1, 1, 1, 1, 1] [2022-12-14 11:39:14,782 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d5a82beb-1ba2-405b-b61f-de248118d018/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Ended with exit code 0 [2022-12-14 11:39:14,975 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14,14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d5a82beb-1ba2-405b-b61f-de248118d018/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 11:39:14,975 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 11:39:14,976 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 11:39:14,976 INFO L85 PathProgramCache]: Analyzing trace with hash 334294308, now seen corresponding path program 10 times [2022-12-14 11:39:14,976 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 11:39:14,976 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [43507715] [2022-12-14 11:39:14,976 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 11:39:14,976 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 11:39:15,023 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 11:39:15,275 INFO L134 CoverageAnalysis]: Checked inductivity of 6848 backedges. 355 proven. 533 refuted. 0 times theorem prover too weak. 5960 trivial. 0 not checked. [2022-12-14 11:39:15,275 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 11:39:15,275 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [43507715] [2022-12-14 11:39:15,275 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [43507715] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 11:39:15,275 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [757236120] [2022-12-14 11:39:15,275 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 11:39:15,275 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 11:39:15,276 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d5a82beb-1ba2-405b-b61f-de248118d018/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 11:39:15,276 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d5a82beb-1ba2-405b-b61f-de248118d018/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 11:39:15,277 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d5a82beb-1ba2-405b-b61f-de248118d018/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2022-12-14 11:39:15,495 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 11:39:15,498 INFO L263 TraceCheckSpWp]: Trace formula consists of 1104 conjuncts, 14 conjunts are in the unsatisfiable core [2022-12-14 11:39:15,502 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 11:39:15,559 INFO L134 CoverageAnalysis]: Checked inductivity of 6848 backedges. 411 proven. 647 refuted. 0 times theorem prover too weak. 5790 trivial. 0 not checked. [2022-12-14 11:39:15,559 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 11:39:16,539 INFO L134 CoverageAnalysis]: Checked inductivity of 6848 backedges. 413 proven. 661 refuted. 0 times theorem prover too weak. 5774 trivial. 0 not checked. [2022-12-14 11:39:16,539 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [757236120] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 11:39:16,539 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1860737075] [2022-12-14 11:39:16,541 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2022-12-14 11:39:16,541 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 11:39:16,541 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-12-14 11:39:16,541 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 11:39:16,541 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 11, 15] total 18 [2022-12-14 11:39:16,541 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [862041840] [2022-12-14 11:39:16,541 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 11:39:16,542 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2022-12-14 11:39:16,542 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 11:39:16,542 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2022-12-14 11:39:16,542 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=243, Unknown=0, NotChecked=0, Total=306 [2022-12-14 11:39:16,543 INFO L87 Difference]: Start difference. First operand 190 states and 253 transitions. Second operand has 18 states, 17 states have (on average 3.764705882352941) internal successors, (64), 18 states have internal predecessors, (64), 13 states have call successors, (18), 1 states have call predecessors, (18), 8 states have return successors, (22), 9 states have call predecessors, (22), 13 states have call successors, (22) [2022-12-14 11:39:16,639 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 11:39:16,639 INFO L93 Difference]: Finished difference Result 210 states and 286 transitions. [2022-12-14 11:39:16,639 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-12-14 11:39:16,639 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 17 states have (on average 3.764705882352941) internal successors, (64), 18 states have internal predecessors, (64), 13 states have call successors, (18), 1 states have call predecessors, (18), 8 states have return successors, (22), 9 states have call predecessors, (22), 13 states have call successors, (22) Word has length 486 [2022-12-14 11:39:16,640 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 11:39:16,642 INFO L225 Difference]: With dead ends: 210 [2022-12-14 11:39:16,642 INFO L226 Difference]: Without dead ends: 198 [2022-12-14 11:39:16,643 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 990 GetRequests, 960 SyntacticMatches, 7 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 135 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=130, Invalid=470, Unknown=0, NotChecked=0, Total=600 [2022-12-14 11:39:16,643 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 34 mSDsluCounter, 92 mSDsCounter, 0 mSdLazyCounter, 206 mSolverCounterSat, 26 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 43 SdHoareTripleChecker+Valid, 108 SdHoareTripleChecker+Invalid, 232 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 26 IncrementalHoareTripleChecker+Valid, 206 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 11:39:16,643 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [43 Valid, 108 Invalid, 232 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [26 Valid, 206 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 11:39:16,644 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 198 states. [2022-12-14 11:39:16,658 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 198 to 190. [2022-12-14 11:39:16,658 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 190 states, 133 states have (on average 1.0676691729323309) internal successors, (142), 129 states have internal predecessors, (142), 38 states have call successors, (38), 28 states have call predecessors, (38), 18 states have return successors, (71), 32 states have call predecessors, (71), 38 states have call successors, (71) [2022-12-14 11:39:16,660 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 190 states to 190 states and 251 transitions. [2022-12-14 11:39:16,660 INFO L78 Accepts]: Start accepts. Automaton has 190 states and 251 transitions. Word has length 486 [2022-12-14 11:39:16,660 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 11:39:16,661 INFO L495 AbstractCegarLoop]: Abstraction has 190 states and 251 transitions. [2022-12-14 11:39:16,661 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 17 states have (on average 3.764705882352941) internal successors, (64), 18 states have internal predecessors, (64), 13 states have call successors, (18), 1 states have call predecessors, (18), 8 states have return successors, (22), 9 states have call predecessors, (22), 13 states have call successors, (22) [2022-12-14 11:39:16,661 INFO L276 IsEmpty]: Start isEmpty. Operand 190 states and 251 transitions. [2022-12-14 11:39:16,665 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 528 [2022-12-14 11:39:16,665 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 11:39:16,665 INFO L195 NwaCegarLoop]: trace histogram [39, 39, 38, 38, 31, 31, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 12, 12, 8, 7, 1, 1, 1, 1, 1, 1] [2022-12-14 11:39:16,670 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d5a82beb-1ba2-405b-b61f-de248118d018/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Ended with exit code 0 [2022-12-14 11:39:16,865 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d5a82beb-1ba2-405b-b61f-de248118d018/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2022-12-14 11:39:16,866 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 11:39:16,867 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 11:39:16,868 INFO L85 PathProgramCache]: Analyzing trace with hash 111580103, now seen corresponding path program 11 times [2022-12-14 11:39:16,868 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 11:39:16,869 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [683862569] [2022-12-14 11:39:16,869 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 11:39:16,870 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 11:39:16,926 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 11:39:17,260 INFO L134 CoverageAnalysis]: Checked inductivity of 8074 backedges. 834 proven. 391 refuted. 0 times theorem prover too weak. 6849 trivial. 0 not checked. [2022-12-14 11:39:17,260 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 11:39:17,260 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [683862569] [2022-12-14 11:39:17,260 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [683862569] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 11:39:17,260 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [682481345] [2022-12-14 11:39:17,260 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 11:39:17,260 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 11:39:17,260 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d5a82beb-1ba2-405b-b61f-de248118d018/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 11:39:17,261 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d5a82beb-1ba2-405b-b61f-de248118d018/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 11:39:17,262 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d5a82beb-1ba2-405b-b61f-de248118d018/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2022-12-14 11:39:17,411 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 19 check-sat command(s) [2022-12-14 11:39:17,412 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 11:39:17,414 INFO L263 TraceCheckSpWp]: Trace formula consists of 622 conjuncts, 16 conjunts are in the unsatisfiable core [2022-12-14 11:39:17,417 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 11:39:17,514 INFO L134 CoverageAnalysis]: Checked inductivity of 8074 backedges. 1330 proven. 143 refuted. 0 times theorem prover too weak. 6601 trivial. 0 not checked. [2022-12-14 11:39:17,514 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 11:39:18,586 INFO L134 CoverageAnalysis]: Checked inductivity of 8074 backedges. 1330 proven. 149 refuted. 0 times theorem prover too weak. 6595 trivial. 0 not checked. [2022-12-14 11:39:18,586 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [682481345] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 11:39:18,586 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [421232716] [2022-12-14 11:39:18,588 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2022-12-14 11:39:18,588 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 11:39:18,588 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-12-14 11:39:18,589 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 11:39:18,589 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 17] total 30 [2022-12-14 11:39:18,589 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1621677564] [2022-12-14 11:39:18,589 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 11:39:18,591 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2022-12-14 11:39:18,591 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 11:39:18,591 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2022-12-14 11:39:18,592 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=759, Unknown=0, NotChecked=0, Total=870 [2022-12-14 11:39:18,592 INFO L87 Difference]: Start difference. First operand 190 states and 251 transitions. Second operand has 30 states, 29 states have (on average 3.3793103448275863) internal successors, (98), 30 states have internal predecessors, (98), 17 states have call successors, (30), 1 states have call predecessors, (30), 14 states have return successors, (38), 22 states have call predecessors, (38), 17 states have call successors, (38) [2022-12-14 11:39:19,100 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 11:39:19,101 INFO L93 Difference]: Finished difference Result 393 states and 525 transitions. [2022-12-14 11:39:19,101 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2022-12-14 11:39:19,101 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 29 states have (on average 3.3793103448275863) internal successors, (98), 30 states have internal predecessors, (98), 17 states have call successors, (30), 1 states have call predecessors, (30), 14 states have return successors, (38), 22 states have call predecessors, (38), 17 states have call successors, (38) Word has length 527 [2022-12-14 11:39:19,102 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 11:39:19,103 INFO L225 Difference]: With dead ends: 393 [2022-12-14 11:39:19,103 INFO L226 Difference]: Without dead ends: 211 [2022-12-14 11:39:19,105 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1087 GetRequests, 1033 SyntacticMatches, 8 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 557 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=352, Invalid=1904, Unknown=0, NotChecked=0, Total=2256 [2022-12-14 11:39:19,105 INFO L413 NwaCegarLoop]: 43 mSDtfsCounter, 68 mSDsluCounter, 289 mSDsCounter, 0 mSdLazyCounter, 820 mSolverCounterSat, 99 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 69 SdHoareTripleChecker+Valid, 332 SdHoareTripleChecker+Invalid, 919 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 99 IncrementalHoareTripleChecker+Valid, 820 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-12-14 11:39:19,105 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [69 Valid, 332 Invalid, 919 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [99 Valid, 820 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-12-14 11:39:19,106 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 211 states. [2022-12-14 11:39:19,121 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 211 to 198. [2022-12-14 11:39:19,121 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 198 states, 139 states have (on average 1.064748201438849) internal successors, (148), 134 states have internal predecessors, (148), 40 states have call successors, (40), 30 states have call predecessors, (40), 18 states have return successors, (65), 33 states have call predecessors, (65), 40 states have call successors, (65) [2022-12-14 11:39:19,122 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 198 states to 198 states and 253 transitions. [2022-12-14 11:39:19,123 INFO L78 Accepts]: Start accepts. Automaton has 198 states and 253 transitions. Word has length 527 [2022-12-14 11:39:19,123 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 11:39:19,123 INFO L495 AbstractCegarLoop]: Abstraction has 198 states and 253 transitions. [2022-12-14 11:39:19,124 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 29 states have (on average 3.3793103448275863) internal successors, (98), 30 states have internal predecessors, (98), 17 states have call successors, (30), 1 states have call predecessors, (30), 14 states have return successors, (38), 22 states have call predecessors, (38), 17 states have call successors, (38) [2022-12-14 11:39:19,124 INFO L276 IsEmpty]: Start isEmpty. Operand 198 states and 253 transitions. [2022-12-14 11:39:19,128 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 569 [2022-12-14 11:39:19,128 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 11:39:19,128 INFO L195 NwaCegarLoop]: trace histogram [42, 42, 41, 41, 34, 33, 21, 21, 21, 21, 21, 21, 21, 20, 20, 20, 20, 20, 20, 20, 13, 13, 9, 7, 1, 1, 1, 1, 1, 1] [2022-12-14 11:39:19,133 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d5a82beb-1ba2-405b-b61f-de248118d018/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2022-12-14 11:39:19,329 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d5a82beb-1ba2-405b-b61f-de248118d018/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2022-12-14 11:39:19,329 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 11:39:19,330 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 11:39:19,330 INFO L85 PathProgramCache]: Analyzing trace with hash 1892734652, now seen corresponding path program 12 times [2022-12-14 11:39:19,331 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 11:39:19,331 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [534740572] [2022-12-14 11:39:19,331 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 11:39:19,332 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 11:39:19,397 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 11:39:19,803 INFO L134 CoverageAnalysis]: Checked inductivity of 9413 backedges. 351 proven. 1184 refuted. 0 times theorem prover too weak. 7878 trivial. 0 not checked. [2022-12-14 11:39:19,803 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 11:39:19,803 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [534740572] [2022-12-14 11:39:19,803 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [534740572] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 11:39:19,803 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [223541879] [2022-12-14 11:39:19,803 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 11:39:19,803 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 11:39:19,804 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d5a82beb-1ba2-405b-b61f-de248118d018/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 11:39:19,804 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d5a82beb-1ba2-405b-b61f-de248118d018/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 11:39:19,805 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d5a82beb-1ba2-405b-b61f-de248118d018/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2022-12-14 11:39:20,001 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 11:39:20,001 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 11:39:20,004 INFO L263 TraceCheckSpWp]: Trace formula consists of 1010 conjuncts, 26 conjunts are in the unsatisfiable core [2022-12-14 11:39:20,011 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 11:39:20,193 INFO L134 CoverageAnalysis]: Checked inductivity of 9413 backedges. 4789 proven. 926 refuted. 0 times theorem prover too weak. 3698 trivial. 0 not checked. [2022-12-14 11:39:20,193 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 11:39:23,030 INFO L134 CoverageAnalysis]: Checked inductivity of 9413 backedges. 827 proven. 1820 refuted. 0 times theorem prover too weak. 6766 trivial. 0 not checked. [2022-12-14 11:39:23,030 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [223541879] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 11:39:23,030 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [764721012] [2022-12-14 11:39:23,032 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2022-12-14 11:39:23,032 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 11:39:23,032 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-12-14 11:39:23,032 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 11:39:23,032 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 19, 27] total 38 [2022-12-14 11:39:23,032 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [239356611] [2022-12-14 11:39:23,032 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 11:39:23,033 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2022-12-14 11:39:23,033 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 11:39:23,033 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2022-12-14 11:39:23,034 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=163, Invalid=1243, Unknown=0, NotChecked=0, Total=1406 [2022-12-14 11:39:23,034 INFO L87 Difference]: Start difference. First operand 198 states and 253 transitions. Second operand has 38 states, 37 states have (on average 3.5945945945945947) internal successors, (133), 38 states have internal predecessors, (133), 31 states have call successors, (41), 2 states have call predecessors, (41), 17 states have return successors, (52), 18 states have call predecessors, (52), 31 states have call successors, (52) [2022-12-14 11:39:23,829 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 11:39:23,829 INFO L93 Difference]: Finished difference Result 414 states and 550 transitions. [2022-12-14 11:39:23,829 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2022-12-14 11:39:23,829 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 37 states have (on average 3.5945945945945947) internal successors, (133), 38 states have internal predecessors, (133), 31 states have call successors, (41), 2 states have call predecessors, (41), 17 states have return successors, (52), 18 states have call predecessors, (52), 31 states have call successors, (52) Word has length 568 [2022-12-14 11:39:23,830 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 11:39:23,830 INFO L225 Difference]: With dead ends: 414 [2022-12-14 11:39:23,830 INFO L226 Difference]: Without dead ends: 197 [2022-12-14 11:39:23,832 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1180 GetRequests, 1104 SyntacticMatches, 13 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1120 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=615, Invalid=3545, Unknown=0, NotChecked=0, Total=4160 [2022-12-14 11:39:23,832 INFO L413 NwaCegarLoop]: 48 mSDtfsCounter, 144 mSDsluCounter, 403 mSDsCounter, 0 mSdLazyCounter, 1382 mSolverCounterSat, 260 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 145 SdHoareTripleChecker+Valid, 451 SdHoareTripleChecker+Invalid, 1642 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 260 IncrementalHoareTripleChecker+Valid, 1382 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-12-14 11:39:23,832 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [145 Valid, 451 Invalid, 1642 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [260 Valid, 1382 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-12-14 11:39:23,832 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 197 states. [2022-12-14 11:39:23,840 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 197 to 177. [2022-12-14 11:39:23,840 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 177 states, 127 states have (on average 1.0708661417322836) internal successors, (136), 121 states have internal predecessors, (136), 33 states have call successors, (33), 29 states have call predecessors, (33), 16 states have return successors, (41), 26 states have call predecessors, (41), 33 states have call successors, (41) [2022-12-14 11:39:23,841 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 177 states to 177 states and 210 transitions. [2022-12-14 11:39:23,841 INFO L78 Accepts]: Start accepts. Automaton has 177 states and 210 transitions. Word has length 568 [2022-12-14 11:39:23,841 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 11:39:23,841 INFO L495 AbstractCegarLoop]: Abstraction has 177 states and 210 transitions. [2022-12-14 11:39:23,842 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 37 states have (on average 3.5945945945945947) internal successors, (133), 38 states have internal predecessors, (133), 31 states have call successors, (41), 2 states have call predecessors, (41), 17 states have return successors, (52), 18 states have call predecessors, (52), 31 states have call successors, (52) [2022-12-14 11:39:23,842 INFO L276 IsEmpty]: Start isEmpty. Operand 177 states and 210 transitions. [2022-12-14 11:39:23,843 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 392 [2022-12-14 11:39:23,843 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 11:39:23,843 INFO L195 NwaCegarLoop]: trace histogram [29, 29, 28, 28, 23, 23, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 9, 9, 6, 5, 1, 1, 1, 1, 1, 1] [2022-12-14 11:39:23,850 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d5a82beb-1ba2-405b-b61f-de248118d018/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2022-12-14 11:39:24,044 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d5a82beb-1ba2-405b-b61f-de248118d018/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2022-12-14 11:39:24,044 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 11:39:24,044 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 11:39:24,045 INFO L85 PathProgramCache]: Analyzing trace with hash -2040161751, now seen corresponding path program 13 times [2022-12-14 11:39:24,045 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 11:39:24,045 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [682706617] [2022-12-14 11:39:24,045 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 11:39:24,045 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 11:39:24,091 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 11:39:24,290 INFO L134 CoverageAnalysis]: Checked inductivity of 4370 backedges. 547 proven. 151 refuted. 0 times theorem prover too weak. 3672 trivial. 0 not checked. [2022-12-14 11:39:24,290 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 11:39:24,290 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [682706617] [2022-12-14 11:39:24,291 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [682706617] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 11:39:24,291 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1120500863] [2022-12-14 11:39:24,291 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 11:39:24,291 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 11:39:24,291 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d5a82beb-1ba2-405b-b61f-de248118d018/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 11:39:24,292 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d5a82beb-1ba2-405b-b61f-de248118d018/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 11:39:24,292 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d5a82beb-1ba2-405b-b61f-de248118d018/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2022-12-14 11:39:24,535 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 11:39:24,537 INFO L263 TraceCheckSpWp]: Trace formula consists of 893 conjuncts, 14 conjunts are in the unsatisfiable core [2022-12-14 11:39:24,541 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 11:39:24,600 INFO L134 CoverageAnalysis]: Checked inductivity of 4370 backedges. 655 proven. 176 refuted. 0 times theorem prover too weak. 3539 trivial. 0 not checked. [2022-12-14 11:39:24,600 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 11:39:25,530 INFO L134 CoverageAnalysis]: Checked inductivity of 4370 backedges. 659 proven. 188 refuted. 0 times theorem prover too weak. 3523 trivial. 0 not checked. [2022-12-14 11:39:25,530 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1120500863] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 11:39:25,530 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [385555932] [2022-12-14 11:39:25,531 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2022-12-14 11:39:25,531 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 11:39:25,531 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-12-14 11:39:25,531 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 11:39:25,532 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 11, 15] total 18 [2022-12-14 11:39:25,532 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [361488075] [2022-12-14 11:39:25,532 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 11:39:25,532 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2022-12-14 11:39:25,532 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 11:39:25,532 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2022-12-14 11:39:25,533 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=243, Unknown=0, NotChecked=0, Total=306 [2022-12-14 11:39:25,533 INFO L87 Difference]: Start difference. First operand 177 states and 210 transitions. Second operand has 18 states, 17 states have (on average 3.823529411764706) internal successors, (65), 18 states have internal predecessors, (65), 13 states have call successors, (19), 1 states have call predecessors, (19), 8 states have return successors, (23), 10 states have call predecessors, (23), 13 states have call successors, (23) [2022-12-14 11:39:25,640 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 11:39:25,640 INFO L93 Difference]: Finished difference Result 184 states and 216 transitions. [2022-12-14 11:39:25,640 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-12-14 11:39:25,640 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 17 states have (on average 3.823529411764706) internal successors, (65), 18 states have internal predecessors, (65), 13 states have call successors, (19), 1 states have call predecessors, (19), 8 states have return successors, (23), 10 states have call predecessors, (23), 13 states have call successors, (23) Word has length 391 [2022-12-14 11:39:25,641 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 11:39:25,641 INFO L225 Difference]: With dead ends: 184 [2022-12-14 11:39:25,642 INFO L226 Difference]: Without dead ends: 177 [2022-12-14 11:39:25,642 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 800 GetRequests, 770 SyntacticMatches, 7 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 135 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=130, Invalid=470, Unknown=0, NotChecked=0, Total=600 [2022-12-14 11:39:25,642 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 37 mSDsluCounter, 92 mSDsCounter, 0 mSdLazyCounter, 236 mSolverCounterSat, 20 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 41 SdHoareTripleChecker+Valid, 108 SdHoareTripleChecker+Invalid, 256 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 20 IncrementalHoareTripleChecker+Valid, 236 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 11:39:25,642 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [41 Valid, 108 Invalid, 256 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [20 Valid, 236 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 11:39:25,643 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 177 states. [2022-12-14 11:39:25,649 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 177 to 177. [2022-12-14 11:39:25,650 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 177 states, 127 states have (on average 1.0708661417322836) internal successors, (136), 121 states have internal predecessors, (136), 33 states have call successors, (33), 29 states have call predecessors, (33), 16 states have return successors, (37), 26 states have call predecessors, (37), 33 states have call successors, (37) [2022-12-14 11:39:25,650 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 177 states to 177 states and 206 transitions. [2022-12-14 11:39:25,650 INFO L78 Accepts]: Start accepts. Automaton has 177 states and 206 transitions. Word has length 391 [2022-12-14 11:39:25,651 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 11:39:25,651 INFO L495 AbstractCegarLoop]: Abstraction has 177 states and 206 transitions. [2022-12-14 11:39:25,651 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 17 states have (on average 3.823529411764706) internal successors, (65), 18 states have internal predecessors, (65), 13 states have call successors, (19), 1 states have call predecessors, (19), 8 states have return successors, (23), 10 states have call predecessors, (23), 13 states have call successors, (23) [2022-12-14 11:39:25,651 INFO L276 IsEmpty]: Start isEmpty. Operand 177 states and 206 transitions. [2022-12-14 11:39:25,653 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 460 [2022-12-14 11:39:25,653 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 11:39:25,653 INFO L195 NwaCegarLoop]: trace histogram [34, 34, 33, 33, 27, 27, 17, 17, 17, 17, 17, 17, 17, 16, 16, 16, 16, 16, 16, 16, 11, 10, 7, 6, 1, 1, 1, 1, 1, 1] [2022-12-14 11:39:25,658 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d5a82beb-1ba2-405b-b61f-de248118d018/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2022-12-14 11:39:25,853 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d5a82beb-1ba2-405b-b61f-de248118d018/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 11:39:25,853 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 11:39:25,853 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 11:39:25,854 INFO L85 PathProgramCache]: Analyzing trace with hash -1780384136, now seen corresponding path program 14 times [2022-12-14 11:39:25,854 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 11:39:25,854 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [744689181] [2022-12-14 11:39:25,854 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 11:39:25,854 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 11:39:25,888 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 11:39:30,028 INFO L134 CoverageAnalysis]: Checked inductivity of 6082 backedges. 0 proven. 2033 refuted. 0 times theorem prover too weak. 4049 trivial. 0 not checked. [2022-12-14 11:39:30,028 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 11:39:30,028 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [744689181] [2022-12-14 11:39:30,028 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [744689181] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 11:39:30,028 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1644524121] [2022-12-14 11:39:30,028 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 11:39:30,029 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 11:39:30,029 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d5a82beb-1ba2-405b-b61f-de248118d018/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 11:39:30,029 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d5a82beb-1ba2-405b-b61f-de248118d018/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 11:39:30,030 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d5a82beb-1ba2-405b-b61f-de248118d018/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2022-12-14 11:39:30,292 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 32 check-sat command(s) [2022-12-14 11:39:30,293 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 11:39:30,298 INFO L263 TraceCheckSpWp]: Trace formula consists of 1044 conjuncts, 271 conjunts are in the unsatisfiable core [2022-12-14 11:39:30,303 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 11:39:31,103 INFO L134 CoverageAnalysis]: Checked inductivity of 6082 backedges. 0 proven. 2033 refuted. 0 times theorem prover too weak. 4049 trivial. 0 not checked. [2022-12-14 11:39:31,103 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 11:39:33,757 INFO L134 CoverageAnalysis]: Checked inductivity of 6082 backedges. 0 proven. 2033 refuted. 0 times theorem prover too weak. 4049 trivial. 0 not checked. [2022-12-14 11:39:33,757 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1644524121] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 11:39:33,757 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1401369933] [2022-12-14 11:39:33,758 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2022-12-14 11:39:33,758 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 11:39:33,759 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-12-14 11:39:33,759 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 11:39:33,759 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 40, 40] total 52 [2022-12-14 11:39:33,759 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [773196217] [2022-12-14 11:39:33,759 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 11:39:33,759 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 52 states [2022-12-14 11:39:33,760 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 11:39:33,760 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2022-12-14 11:39:33,761 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=125, Invalid=2527, Unknown=0, NotChecked=0, Total=2652 [2022-12-14 11:39:33,761 INFO L87 Difference]: Start difference. First operand 177 states and 206 transitions. Second operand has 52 states, 52 states have (on average 1.1923076923076923) internal successors, (62), 27 states have internal predecessors, (62), 11 states have call successors, (13), 1 states have call predecessors, (13), 14 states have return successors, (35), 35 states have call predecessors, (35), 11 states have call successors, (35) [2022-12-14 11:39:34,232 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 11:39:34,232 INFO L93 Difference]: Finished difference Result 177 states and 206 transitions. [2022-12-14 11:39:34,232 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2022-12-14 11:39:34,232 INFO L78 Accepts]: Start accepts. Automaton has has 52 states, 52 states have (on average 1.1923076923076923) internal successors, (62), 27 states have internal predecessors, (62), 11 states have call successors, (13), 1 states have call predecessors, (13), 14 states have return successors, (35), 35 states have call predecessors, (35), 11 states have call successors, (35) Word has length 459 [2022-12-14 11:39:34,233 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 11:39:34,233 INFO L225 Difference]: With dead ends: 177 [2022-12-14 11:39:34,233 INFO L226 Difference]: Without dead ends: 0 [2022-12-14 11:39:34,234 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1053 GetRequests, 893 SyntacticMatches, 110 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 572 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=125, Invalid=2527, Unknown=0, NotChecked=0, Total=2652 [2022-12-14 11:39:34,234 INFO L413 NwaCegarLoop]: 60 mSDtfsCounter, 0 mSDsluCounter, 2079 mSDsCounter, 0 mSdLazyCounter, 1482 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 2139 SdHoareTripleChecker+Invalid, 1482 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 1482 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-12-14 11:39:34,234 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 2139 Invalid, 1482 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 1482 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-12-14 11:39:34,234 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2022-12-14 11:39:34,234 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2022-12-14 11:39:34,235 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 0 states, 0 states have (on average 0.0) internal successors, (0), 0 states have internal predecessors, (0), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 11:39:34,235 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2022-12-14 11:39:34,235 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 459 [2022-12-14 11:39:34,235 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 11:39:34,235 INFO L495 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2022-12-14 11:39:34,235 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 52 states, 52 states have (on average 1.1923076923076923) internal successors, (62), 27 states have internal predecessors, (62), 11 states have call successors, (13), 1 states have call predecessors, (13), 14 states have return successors, (35), 35 states have call predecessors, (35), 11 states have call successors, (35) [2022-12-14 11:39:34,235 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2022-12-14 11:39:34,235 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2022-12-14 11:39:34,237 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION (0 of 1 remaining) [2022-12-14 11:39:34,244 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d5a82beb-1ba2-405b-b61f-de248118d018/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2022-12-14 11:39:34,437 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d5a82beb-1ba2-405b-b61f-de248118d018/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 11:39:34,439 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2022-12-14 11:39:38,551 INFO L899 garLoopResultBuilder]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2022-12-14 11:39:38,551 INFO L899 garLoopResultBuilder]: For program point ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION(line 41) no Hoare annotation was computed. [2022-12-14 11:39:38,551 INFO L899 garLoopResultBuilder]: For program point $Ultimate##0(line -1) no Hoare annotation was computed. [2022-12-14 11:39:38,552 INFO L899 garLoopResultBuilder]: For program point L41(line 41) no Hoare annotation was computed. [2022-12-14 11:39:38,552 INFO L899 garLoopResultBuilder]: For program point L40(lines 40 42) no Hoare annotation was computed. [2022-12-14 11:39:38,552 INFO L895 garLoopResultBuilder]: At program point L39(line 39) the Hoare annotation is: (let ((.cse0 (select |#memory_int| 1))) (and (= (select |#length| 3) 12) (= 18 (select |#length| 2)) (= 2 (select |#length| 1)) (= (select |#valid| 3) 1) (= |ULTIMATE.start_main_~x~0#1| 8) (= (select |#valid| 1) 1) (= (select |#valid| 0) 0) (= (select |#valid| 2) 1) (= |#NULL.offset| 0) (= (select .cse0 0) 48) (= (select .cse0 1) 0) (< 0 |#StackHeapBarrier|) (= |#NULL.base| 0))) [2022-12-14 11:39:38,552 INFO L899 garLoopResultBuilder]: For program point L39-1(line 39) no Hoare annotation was computed. [2022-12-14 11:39:38,552 INFO L895 garLoopResultBuilder]: At program point L40-2(lines 40 42) the Hoare annotation is: (<= 8 |ULTIMATE.start_main_~x~0#1|) [2022-12-14 11:39:38,552 INFO L895 garLoopResultBuilder]: At program point L25(line 25) the Hoare annotation is: (and (not (<= fibo2_~n 1)) (<= |fibo2_#in~n| fibo2_~n) (<= fibo2_~n |fibo2_#in~n|)) [2022-12-14 11:39:38,553 INFO L899 garLoopResultBuilder]: For program point L25-1(line 25) no Hoare annotation was computed. [2022-12-14 11:39:38,553 INFO L895 garLoopResultBuilder]: At program point L25-2(line 25) the Hoare annotation is: (let ((.cse3 (<= fibo2_~n 4)) (.cse4 (<= 5 fibo2_~n)) (.cse11 (<= |fibo2_#in~n| fibo2_~n)) (.cse8 (<= fibo2_~n |fibo2_#in~n|))) (let ((.cse1 (and .cse8 (<= 6 fibo2_~n) (<= |fibo2_#in~n| 6))) (.cse7 (<= |fibo2_#in~n| 2)) (.cse0 (and .cse11 (<= fibo2_~n 7) (<= 7 |fibo2_#in~n|))) (.cse6 (and .cse4 .cse8 (<= |fibo2_#in~n| 5))) (.cse2 (and .cse11 (<= 8 |fibo2_#in~n|) .cse8)) (.cse9 (and (<= |fibo2_#in~n| 3) .cse11 (<= 3 |fibo2_#in~n|) .cse8)) (.cse5 (and .cse3 .cse11 (<= 4 fibo2_~n) .cse8))) (and (or .cse0 .cse1 .cse2 (and .cse3 (<= |fibo2_#t~ret6| 1) (<= 1 |fibo2_#t~ret6|)) (and (<= 3 |fibo2_#t~ret6|) (<= |fibo2_#t~ret6| 3) .cse4) .cse5) (or .cse0 (and (<= |fibo2_#t~ret6| 2) (<= 2 |fibo2_#t~ret6|)) .cse1 .cse6 (and .cse7 (< 1 fibo2_~n) .cse8) .cse2 .cse9) (or (and (<= |fibo2_#t~ret6| 5) (<= 5 |fibo2_#t~ret6|)) .cse7 .cse0 .cse6 .cse2 .cse9 .cse5) (let ((.cse10 (select |#memory_int| 1))) (or (and (<= 8 |fibo2_#t~ret6|) (<= |fibo2_#t~ret6| 8)) (not (= (select .cse10 0) 48)) (not (= |#NULL.offset| 0)) (not (= 2 (select |#length| 1))) (not (= 7 |fibo2_#in~n|)) (not (< 0 |#StackHeapBarrier|)) (not (= (select |#valid| 3) 1)) (not (= (select |#length| 3) 12)) (not (= (select |#valid| 0) 0)) (not (= (select .cse10 1) 0)) (not (= (select |#valid| 1) 1)) (not (= 18 (select |#length| 2))) (not (= |#NULL.base| 0)) (not (= (select |#valid| 2) 1))))))) [2022-12-14 11:39:38,553 INFO L899 garLoopResultBuilder]: For program point L22(lines 22 26) no Hoare annotation was computed. [2022-12-14 11:39:38,553 INFO L899 garLoopResultBuilder]: For program point L25-3(line 25) no Hoare annotation was computed. [2022-12-14 11:39:38,553 INFO L899 garLoopResultBuilder]: For program point L20(lines 20 26) no Hoare annotation was computed. [2022-12-14 11:39:38,554 INFO L899 garLoopResultBuilder]: For program point fibo2FINAL(lines 19 27) no Hoare annotation was computed. [2022-12-14 11:39:38,554 INFO L902 garLoopResultBuilder]: At program point $Ultimate##0(lines 19 27) the Hoare annotation is: true [2022-12-14 11:39:38,554 INFO L899 garLoopResultBuilder]: For program point fibo2EXIT(lines 19 27) no Hoare annotation was computed. [2022-12-14 11:39:38,554 INFO L895 garLoopResultBuilder]: At program point L15(line 15) the Hoare annotation is: (and (<= fibo1_~n |fibo1_#in~n|) (<= |fibo1_#in~n| fibo1_~n) (not (<= fibo1_~n 1))) [2022-12-14 11:39:38,554 INFO L899 garLoopResultBuilder]: For program point L15-1(line 15) no Hoare annotation was computed. [2022-12-14 11:39:38,555 INFO L895 garLoopResultBuilder]: At program point L15-2(line 15) the Hoare annotation is: (let ((.cse7 (<= |fibo1_#in~n| 3)) (.cse0 (<= |fibo1_#in~n| 4)) (.cse9 (<= 3 fibo1_~n)) (.cse10 (<= |fibo1_#in~n| fibo1_~n)) (.cse5 (<= |fibo1_#in~n| 5))) (let ((.cse4 (and .cse5 (<= 5 fibo1_~n))) (.cse2 (not (<= 3 |fibo1_#in~n|))) (.cse6 (and .cse9 (<= 7 fibo1_~n) .cse10)) (.cse1 (and (<= 4 fibo1_~n) .cse0)) (.cse3 (and .cse9 .cse7 .cse10))) (and (or (not .cse0) .cse1 (= |fibo1_#t~ret4| 1)) (or .cse2 .cse3 .cse4 (not .cse5) (and (<= 2 |fibo1_#t~ret4|) (<= |fibo1_#t~ret4| 2))) (or .cse6 .cse1 .cse7 .cse4 (and (<= |fibo1_#t~ret4| 5) (<= 5 |fibo1_#t~ret4|))) (<= fibo1_~n |fibo1_#in~n|) (let ((.cse8 (select |#memory_int| 1))) (or (and (<= 13 |fibo1_#t~ret4|) (<= |fibo1_#t~ret4| 13)) (not (= (select .cse8 0) 48)) (not (= |#NULL.offset| 0)) (not (= 2 (select |#length| 1))) (not (< 0 |#StackHeapBarrier|)) (not (= (select |#valid| 3) 1)) (not (= (select |#length| 3) 12)) (not (= (select |#valid| 0) 0)) (not (= (select .cse8 1) 0)) (not (= (select |#valid| 1) 1)) (not (= 18 (select |#length| 2))) (not (= |fibo1_#in~n| 8)) (not (= |#NULL.base| 0)) (not (= (select |#valid| 2) 1)))) (< 1 fibo1_~n) (or (and (<= |fibo1_#in~n| 6) (<= 6 fibo1_~n)) .cse2 .cse6 .cse1 .cse3 (and (<= 3 |fibo1_#t~ret4|) (<= |fibo1_#t~ret4| 3)))))) [2022-12-14 11:39:38,555 INFO L899 garLoopResultBuilder]: For program point L12(lines 12 16) no Hoare annotation was computed. [2022-12-14 11:39:38,555 INFO L899 garLoopResultBuilder]: For program point L15-3(line 15) no Hoare annotation was computed. [2022-12-14 11:39:38,555 INFO L899 garLoopResultBuilder]: For program point fibo1FINAL(lines 9 17) no Hoare annotation was computed. [2022-12-14 11:39:38,555 INFO L899 garLoopResultBuilder]: For program point L10(lines 10 16) no Hoare annotation was computed. [2022-12-14 11:39:38,555 INFO L902 garLoopResultBuilder]: At program point $Ultimate##0(lines 9 17) the Hoare annotation is: true [2022-12-14 11:39:38,555 INFO L899 garLoopResultBuilder]: For program point fibo1EXIT(lines 9 17) no Hoare annotation was computed. [2022-12-14 11:39:38,558 INFO L445 BasicCegarLoop]: Path program histogram: [14, 1, 1, 1, 1, 1, 1] [2022-12-14 11:39:38,560 INFO L178 ceAbstractionStarter]: Computing trace abstraction results [2022-12-14 11:39:38,569 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 14.12 11:39:38 BoogieIcfgContainer [2022-12-14 11:39:38,569 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2022-12-14 11:39:38,570 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2022-12-14 11:39:38,570 INFO L271 PluginConnector]: Initializing Witness Printer... [2022-12-14 11:39:38,570 INFO L275 PluginConnector]: Witness Printer initialized [2022-12-14 11:39:38,570 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.12 11:38:49" (3/4) ... [2022-12-14 11:39:38,572 INFO L137 WitnessPrinter]: Generating witness for correct program [2022-12-14 11:39:38,576 INFO L361 RCFGBacktranslator]: Ignoring RootEdge to procedure fibo2 [2022-12-14 11:39:38,576 INFO L361 RCFGBacktranslator]: Ignoring RootEdge to procedure fibo1 [2022-12-14 11:39:38,579 INFO L961 BoogieBacktranslator]: Reduced CFG by removing 13 nodes and edges [2022-12-14 11:39:38,579 INFO L961 BoogieBacktranslator]: Reduced CFG by removing 5 nodes and edges [2022-12-14 11:39:38,579 INFO L961 BoogieBacktranslator]: Reduced CFG by removing 3 nodes and edges [2022-12-14 11:39:38,579 INFO L961 BoogieBacktranslator]: Reduced CFG by removing 1 nodes and edges [2022-12-14 11:39:38,601 INFO L141 WitnessManager]: Wrote witness to /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d5a82beb-1ba2-405b-b61f-de248118d018/bin/utaipan-gh47qXpMRh/witness.graphml [2022-12-14 11:39:38,602 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2022-12-14 11:39:38,602 INFO L158 Benchmark]: Toolchain (without parser) took 49573.21ms. Allocated memory was 148.9MB in the beginning and 545.3MB in the end (delta: 396.4MB). Free memory was 114.5MB in the beginning and 453.2MB in the end (delta: -338.7MB). Peak memory consumption was 58.7MB. Max. memory is 16.1GB. [2022-12-14 11:39:38,602 INFO L158 Benchmark]: CDTParser took 0.12ms. Allocated memory is still 148.9MB. Free memory is still 120.3MB. There was no memory consumed. Max. memory is 16.1GB. [2022-12-14 11:39:38,603 INFO L158 Benchmark]: CACSL2BoogieTranslator took 167.64ms. Allocated memory is still 148.9MB. Free memory was 114.0MB in the beginning and 104.0MB in the end (delta: 10.0MB). Peak memory consumption was 10.5MB. Max. memory is 16.1GB. [2022-12-14 11:39:38,603 INFO L158 Benchmark]: Boogie Procedure Inliner took 27.50ms. Allocated memory is still 148.9MB. Free memory was 104.0MB in the beginning and 102.5MB in the end (delta: 1.5MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. [2022-12-14 11:39:38,603 INFO L158 Benchmark]: Boogie Preprocessor took 17.62ms. Allocated memory is still 148.9MB. Free memory was 102.5MB in the beginning and 101.6MB in the end (delta: 946.7kB). There was no memory consumed. Max. memory is 16.1GB. [2022-12-14 11:39:38,604 INFO L158 Benchmark]: RCFGBuilder took 226.90ms. Allocated memory is still 148.9MB. Free memory was 101.6MB in the beginning and 91.1MB in the end (delta: 10.5MB). Peak memory consumption was 10.5MB. Max. memory is 16.1GB. [2022-12-14 11:39:38,604 INFO L158 Benchmark]: TraceAbstraction took 49095.41ms. Allocated memory was 148.9MB in the beginning and 545.3MB in the end (delta: 396.4MB). Free memory was 90.4MB in the beginning and 456.4MB in the end (delta: -366.0MB). Peak memory consumption was 323.0MB. Max. memory is 16.1GB. [2022-12-14 11:39:38,604 INFO L158 Benchmark]: Witness Printer took 31.86ms. Allocated memory is still 545.3MB. Free memory was 456.4MB in the beginning and 453.2MB in the end (delta: 3.1MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. [2022-12-14 11:39:38,605 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.12ms. Allocated memory is still 148.9MB. Free memory is still 120.3MB. There was no memory consumed. Max. memory is 16.1GB. * CACSL2BoogieTranslator took 167.64ms. Allocated memory is still 148.9MB. Free memory was 114.0MB in the beginning and 104.0MB in the end (delta: 10.0MB). Peak memory consumption was 10.5MB. Max. memory is 16.1GB. * Boogie Procedure Inliner took 27.50ms. Allocated memory is still 148.9MB. Free memory was 104.0MB in the beginning and 102.5MB in the end (delta: 1.5MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. * Boogie Preprocessor took 17.62ms. Allocated memory is still 148.9MB. Free memory was 102.5MB in the beginning and 101.6MB in the end (delta: 946.7kB). There was no memory consumed. Max. memory is 16.1GB. * RCFGBuilder took 226.90ms. Allocated memory is still 148.9MB. Free memory was 101.6MB in the beginning and 91.1MB in the end (delta: 10.5MB). Peak memory consumption was 10.5MB. Max. memory is 16.1GB. * TraceAbstraction took 49095.41ms. Allocated memory was 148.9MB in the beginning and 545.3MB in the end (delta: 396.4MB). Free memory was 90.4MB in the beginning and 456.4MB in the end (delta: -366.0MB). Peak memory consumption was 323.0MB. Max. memory is 16.1GB. * Witness Printer took 31.86ms. Allocated memory is still 545.3MB. Free memory was 456.4MB in the beginning and 453.2MB in the end (delta: 3.1MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - StatisticsResult: ErrorAutomatonStatistics NumberErrorTraces: 0, NumberStatementsAllTraces: 0, NumberRelevantStatements: 0, 0.0s ErrorAutomatonConstructionTimeTotal, 0.0s FaulLocalizationTime, NumberStatementsFirstTrace: -1, TraceLengthAvg: 0, 0.0s ErrorAutomatonConstructionTimeAvg, 0.0s ErrorAutomatonDifferenceTimeAvg, 0.0s ErrorAutomatonDifferenceTimeTotal, NumberOfNoEnhancement: 0, NumberOfFiniteEnhancement: 0, NumberOfInfiniteEnhancement: 0 - PositiveResult [Line: 41]: call to reach_error is unreachable For all program executions holds that call to reach_error is unreachable at this location - StatisticsResult: Ultimate Automizer benchmark data CFG has 3 procedures, 26 locations, 1 error locations. Started 1 CEGAR loops. OverallTime: 49.0s, OverallIterations: 20, TraceHistogramMax: 47, PathProgramHistogramMax: 14, EmptinessCheckTime: 0.1s, AutomataDifference: 7.9s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 4.1s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 0 mSolverCounterUnknown, 1498 SdHoareTripleChecker+Valid, 4.5s IncrementalHoareTripleChecker+Time, 0 mSdLazyCounter, 1445 mSDsluCounter, 6075 SdHoareTripleChecker+Invalid, 3.9s Time, 0 mProtectedAction, 0 SdHoareTripleChecker+Unchecked, 0 IncrementalHoareTripleChecker+Unchecked, 5443 mSDsCounter, 2256 IncrementalHoareTripleChecker+Valid, 0 mProtectedPredicate, 12039 IncrementalHoareTripleChecker+Invalid, 14295 SdHoareTripleChecker+Unknown, 0 mSolverCounterNotChecked, 2256 mSolverCounterUnsat, 632 mSDtfsCounter, 12039 mSolverCounterSat, 0.1s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Unknown, PredicateUnifierStatistics: 0 DeclaredPredicates, 10965 GetRequests, 10049 SyntacticMatches, 223 SemanticMatches, 693 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7228 ImplicationChecksByTransitivity, 7.2s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=198occurred in iteration=17, InterpolantAutomatonStates: 453, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.2s AutomataMinimizationTime, 20 MinimizatonAttempts, 268 StatesRemovedByMinimization, 16 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 8 LocationsWithAnnotation, 1076 PreInvPairs, 1892 NumberOfFragments, 592 HoareAnnotationTreeSize, 1076 FomulaSimplifications, 58678 FormulaSimplificationTreeSizeReduction, 1.4s HoareSimplificationTime, 8 FomulaSimplificationsInter, 82044 FormulaSimplificationTreeSizeReductionInter, 2.6s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.3s SsaConstructionTime, 1.2s SatisfiabilityAnalysisTime, 29.5s InterpolantComputationTime, 10347 NumberOfCodeBlocks, 9156 NumberOfCodeBlocksAsserted, 106 NumberOfCheckSat, 15455 ConstructedInterpolants, 0 QuantifiedInterpolants, 24383 SizeOfPredicates, 101 NumberOfNonLiveVariables, 8992 ConjunctsInSsa, 505 ConjunctsInUnsatCore, 56 InterpolantComputations, 2 PerfectInterpolantSequences, 171270/194583 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: OVERALL_TIME: 0.1s, ICFG_INTERPRETER_ENTERED_PROCEDURES: 3, DAG_INTERPRETER_EARLY_EXIT_QUERIES_NONTRIVIAL: 15, DAG_INTERPRETER_EARLY_EXITS: 6, TOOLS_POST_APPLICATIONS: 13, TOOLS_POST_TIME: 0.0s, TOOLS_POST_CALL_APPLICATIONS: 8, TOOLS_POST_CALL_TIME: 0.0s, TOOLS_POST_RETURN_APPLICATIONS: 6, TOOLS_POST_RETURN_TIME: 0.0s, TOOLS_QUANTIFIERELIM_APPLICATIONS: 27, TOOLS_QUANTIFIERELIM_TIME: 0.1s, TOOLS_QUANTIFIERELIM_MAX_TIME: 0.0s, FLUID_QUERY_TIME: 0.0s, FLUID_QUERIES: 35, FLUID_YES_ANSWERS: 0, DOMAIN_JOIN_APPLICATIONS: 1, DOMAIN_JOIN_TIME: 0.0s, DOMAIN_ALPHA_APPLICATIONS: 0, DOMAIN_ALPHA_TIME: 0.0s, DOMAIN_WIDEN_APPLICATIONS: 0, DOMAIN_WIDEN_TIME: 0.0s, DOMAIN_ISSUBSETEQ_APPLICATIONS: 0, DOMAIN_ISSUBSETEQ_TIME: 0.0s, DOMAIN_ISBOTTOM_APPLICATIONS: 15, DOMAIN_ISBOTTOM_TIME: 0.0s, LOOP_SUMMARIZER_APPLICATIONS: 0, LOOP_SUMMARIZER_CACHE_MISSES: 0, LOOP_SUMMARIZER_OVERALL_TIME: 0.0s, LOOP_SUMMARIZER_NEW_COMPUTATION_TIME: 0.0s, LOOP_SUMMARIZER_FIXPOINT_ITERATIONS: 0, CALL_SUMMARIZER_APPLICATIONS: 6, CALL_SUMMARIZER_CACHE_MISSES: 2, CALL_SUMMARIZER_OVERALL_TIME: 0.0s, CALL_SUMMARIZER_NEW_COMPUTATION_TIME: 0.0s, PROCEDURE_GRAPH_BUILDER_TIME: 0.0s, PATH_EXPR_TIME: 0.0s, REGEX_TO_DAG_TIME: 0.0s, DAG_COMPRESSION_TIME: 0.0s, DAG_COMPRESSION_PROCESSED_NODES: 142, DAG_COMPRESSION_RETAINED_NODES: 53, ReuseStatistics: No data available - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - InvariantResult [Line: 40]: Loop Invariant Derived loop invariant: 8 <= x RESULT: Ultimate proved your program to be correct! [2022-12-14 11:39:38,620 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d5a82beb-1ba2-405b-b61f-de248118d018/bin/utaipan-gh47qXpMRh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Forceful destruction successful, exit code 0 Received shutdown request... --- End real Ultimate output --- Execution finished normally Writing output log to file Ultimate.log Result: TRUE