./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 4e7fbc69 Calling Ultimate with: /usr/lib/jvm/java-11-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af79cf74-59e5-490f-9e12-dca361e5b163/bin/utaipan-Q6hlc19bkW/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af79cf74-59e5-490f-9e12-dca361e5b163/bin/utaipan-Q6hlc19bkW/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af79cf74-59e5-490f-9e12-dca361e5b163/bin/utaipan-Q6hlc19bkW/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af79cf74-59e5-490f-9e12-dca361e5b163/bin/utaipan-Q6hlc19bkW/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_af79cf74-59e5-490f-9e12-dca361e5b163/bin/utaipan-Q6hlc19bkW/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af79cf74-59e5-490f-9e12-dca361e5b163/bin/utaipan-Q6hlc19bkW --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 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-4e7fbc6 [2022-11-23 15:55:55,974 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-11-23 15:55:55,978 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-11-23 15:55:56,019 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-11-23 15:55:56,025 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-11-23 15:55:56,030 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-11-23 15:55:56,032 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-11-23 15:55:56,033 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-11-23 15:55:56,035 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-11-23 15:55:56,036 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-11-23 15:55:56,037 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-11-23 15:55:56,039 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-11-23 15:55:56,039 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-11-23 15:55:56,040 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-11-23 15:55:56,042 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-11-23 15:55:56,043 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-11-23 15:55:56,044 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-11-23 15:55:56,045 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-11-23 15:55:56,047 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-11-23 15:55:56,049 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-11-23 15:55:56,051 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-11-23 15:55:56,064 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-11-23 15:55:56,066 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-11-23 15:55:56,067 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-11-23 15:55:56,079 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-11-23 15:55:56,080 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-11-23 15:55:56,080 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-11-23 15:55:56,081 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-11-23 15:55:56,081 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-11-23 15:55:56,082 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-11-23 15:55:56,083 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-11-23 15:55:56,083 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-11-23 15:55:56,084 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-11-23 15:55:56,085 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-11-23 15:55:56,090 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-11-23 15:55:56,091 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-11-23 15:55:56,092 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-11-23 15:55:56,092 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-11-23 15:55:56,093 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-11-23 15:55:56,094 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-11-23 15:55:56,097 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-11-23 15:55:56,098 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af79cf74-59e5-490f-9e12-dca361e5b163/bin/utaipan-Q6hlc19bkW/config/svcomp-Reach-32bit-Taipan_Default.epf [2022-11-23 15:55:56,143 INFO L113 SettingsManager]: Loading preferences was successful [2022-11-23 15:55:56,143 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-11-23 15:55:56,144 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-11-23 15:55:56,144 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-11-23 15:55:56,145 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-11-23 15:55:56,145 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-11-23 15:55:56,145 INFO L138 SettingsManager]: * User list type=DISABLED [2022-11-23 15:55:56,146 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-11-23 15:55:56,146 INFO L138 SettingsManager]: * Explicit value domain=true [2022-11-23 15:55:56,146 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-11-23 15:55:56,146 INFO L138 SettingsManager]: * Octagon Domain=false [2022-11-23 15:55:56,146 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-11-23 15:55:56,147 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-11-23 15:55:56,147 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-11-23 15:55:56,147 INFO L138 SettingsManager]: * Interval Domain=false [2022-11-23 15:55:56,147 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-11-23 15:55:56,148 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-11-23 15:55:56,148 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-11-23 15:55:56,149 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-11-23 15:55:56,149 INFO L138 SettingsManager]: * sizeof long=4 [2022-11-23 15:55:56,149 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-11-23 15:55:56,149 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-11-23 15:55:56,150 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-11-23 15:55:56,150 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-11-23 15:55:56,150 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-11-23 15:55:56,150 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-11-23 15:55:56,151 INFO L138 SettingsManager]: * sizeof long double=12 [2022-11-23 15:55:56,151 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-11-23 15:55:56,151 INFO L138 SettingsManager]: * Use constant arrays=true [2022-11-23 15:55:56,151 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-11-23 15:55:56,152 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-11-23 15:55:56,152 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-11-23 15:55:56,152 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-23 15:55:56,152 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-11-23 15:55:56,153 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-11-23 15:55:56,153 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-11-23 15:55:56,153 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-11-23 15:55:56,153 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-11-23 15:55:56,153 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-11-23 15:55:56,154 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-11-23 15:55:56,154 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-11-23 15:55:56,154 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_af79cf74-59e5-490f-9e12-dca361e5b163/bin/utaipan-Q6hlc19bkW/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af79cf74-59e5-490f-9e12-dca361e5b163/bin/utaipan-Q6hlc19bkW Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 50f60fa428d099767eedeaaecff58f84e68d960030ff43c7eae2dbdfbde6f992 [2022-11-23 15:55:56,496 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-11-23 15:55:56,534 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-11-23 15:55:56,537 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-11-23 15:55:56,538 INFO L271 PluginConnector]: Initializing CDTParser... [2022-11-23 15:55:56,539 INFO L275 PluginConnector]: CDTParser initialized [2022-11-23 15:55:56,540 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af79cf74-59e5-490f-9e12-dca361e5b163/bin/utaipan-Q6hlc19bkW/../../sv-benchmarks/c/recursive-simple/fibo_2calls_8-1.c [2022-11-23 15:55:59,914 INFO L500 CDTParser]: Created temporary CDT project at NULL [2022-11-23 15:56:00,168 INFO L351 CDTParser]: Found 1 translation units. [2022-11-23 15:56:00,168 INFO L172 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af79cf74-59e5-490f-9e12-dca361e5b163/sv-benchmarks/c/recursive-simple/fibo_2calls_8-1.c [2022-11-23 15:56:00,176 INFO L394 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af79cf74-59e5-490f-9e12-dca361e5b163/bin/utaipan-Q6hlc19bkW/data/e9980b411/59095d3760f045a492de906eecbf624a/FLAG81c3ed9e0 [2022-11-23 15:56:00,195 INFO L402 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af79cf74-59e5-490f-9e12-dca361e5b163/bin/utaipan-Q6hlc19bkW/data/e9980b411/59095d3760f045a492de906eecbf624a [2022-11-23 15:56:00,198 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-11-23 15:56:00,200 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-11-23 15:56:00,202 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-11-23 15:56:00,202 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-11-23 15:56:00,207 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-11-23 15:56:00,208 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 03:56:00" (1/1) ... [2022-11-23 15:56:00,210 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@678b9f44 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:56:00, skipping insertion in model container [2022-11-23 15:56:00,210 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 03:56:00" (1/1) ... [2022-11-23 15:56:00,220 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-11-23 15:56:00,237 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-11-23 15:56:00,426 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_af79cf74-59e5-490f-9e12-dca361e5b163/sv-benchmarks/c/recursive-simple/fibo_2calls_8-1.c[947,960] [2022-11-23 15:56:00,431 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-23 15:56:00,445 INFO L203 MainTranslator]: Completed pre-run [2022-11-23 15:56:00,488 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_af79cf74-59e5-490f-9e12-dca361e5b163/sv-benchmarks/c/recursive-simple/fibo_2calls_8-1.c[947,960] [2022-11-23 15:56:00,489 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-23 15:56:00,522 INFO L208 MainTranslator]: Completed translation [2022-11-23 15:56:00,523 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:56:00 WrapperNode [2022-11-23 15:56:00,523 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-11-23 15:56:00,525 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-11-23 15:56:00,525 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-11-23 15:56:00,525 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-11-23 15:56:00,535 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:56:00" (1/1) ... [2022-11-23 15:56:00,542 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:56:00" (1/1) ... [2022-11-23 15:56:00,562 INFO L138 Inliner]: procedures = 14, calls = 12, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 21 [2022-11-23 15:56:00,563 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-11-23 15:56:00,564 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-11-23 15:56:00,564 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-11-23 15:56:00,564 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-11-23 15:56:00,575 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:56:00" (1/1) ... [2022-11-23 15:56:00,576 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:56:00" (1/1) ... [2022-11-23 15:56:00,587 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:56:00" (1/1) ... [2022-11-23 15:56:00,596 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:56:00" (1/1) ... [2022-11-23 15:56:00,600 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:56:00" (1/1) ... [2022-11-23 15:56:00,603 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:56:00" (1/1) ... [2022-11-23 15:56:00,610 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:56:00" (1/1) ... [2022-11-23 15:56:00,611 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:56:00" (1/1) ... [2022-11-23 15:56:00,613 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-11-23 15:56:00,614 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-11-23 15:56:00,615 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-11-23 15:56:00,615 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-11-23 15:56:00,616 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:56:00" (1/1) ... [2022-11-23 15:56:00,628 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-23 15:56:00,642 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af79cf74-59e5-490f-9e12-dca361e5b163/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 15:56:00,663 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af79cf74-59e5-490f-9e12-dca361e5b163/bin/utaipan-Q6hlc19bkW/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-11-23 15:56:00,666 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af79cf74-59e5-490f-9e12-dca361e5b163/bin/utaipan-Q6hlc19bkW/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-11-23 15:56:00,713 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-11-23 15:56:00,714 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-11-23 15:56:00,714 INFO L130 BoogieDeclarations]: Found specification of procedure fibo2 [2022-11-23 15:56:00,714 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo2 [2022-11-23 15:56:00,715 INFO L130 BoogieDeclarations]: Found specification of procedure fibo1 [2022-11-23 15:56:00,716 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo1 [2022-11-23 15:56:00,716 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-11-23 15:56:00,716 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-11-23 15:56:00,813 INFO L235 CfgBuilder]: Building ICFG [2022-11-23 15:56:00,819 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-11-23 15:56:01,047 INFO L276 CfgBuilder]: Performing block encoding [2022-11-23 15:56:01,072 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-11-23 15:56:01,073 INFO L300 CfgBuilder]: Removed 0 assume(true) statements. [2022-11-23 15:56:01,076 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 03:56:01 BoogieIcfgContainer [2022-11-23 15:56:01,076 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-11-23 15:56:01,079 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-11-23 15:56:01,079 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-11-23 15:56:01,083 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-11-23 15:56:01,084 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 03:56:00" (1/3) ... [2022-11-23 15:56:01,086 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1f6d3295 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 03:56:01, skipping insertion in model container [2022-11-23 15:56:01,088 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:56:00" (2/3) ... [2022-11-23 15:56:01,088 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1f6d3295 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 03:56:01, skipping insertion in model container [2022-11-23 15:56:01,089 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 03:56:01" (3/3) ... [2022-11-23 15:56:01,090 INFO L112 eAbstractionObserver]: Analyzing ICFG fibo_2calls_8-1.c [2022-11-23 15:56:01,123 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-11-23 15:56:01,124 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-11-23 15:56:01,206 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-11-23 15:56:01,215 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;@6f2dcf32, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-11-23 15:56:01,215 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-11-23 15:56:01,224 INFO L276 IsEmpty]: Start isEmpty. Operand has 26 states, 17 states have (on average 1.3529411764705883) internal successors, (23), 18 states have internal predecessors, (23), 5 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-11-23 15:56:01,244 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2022-11-23 15:56:01,244 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 15:56:01,245 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 15:56:01,246 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 15:56:01,259 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 15:56:01,260 INFO L85 PathProgramCache]: Analyzing trace with hash 2097990987, now seen corresponding path program 1 times [2022-11-23 15:56:01,269 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 15:56:01,269 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1191545943] [2022-11-23 15:56:01,270 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:56:01,270 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 15:56:01,402 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:56:01,547 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 15:56:01,548 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 15:56:01,548 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1191545943] [2022-11-23 15:56:01,549 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1191545943] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 15:56:01,549 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-23 15:56:01,550 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-11-23 15:56:01,552 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1618426473] [2022-11-23 15:56:01,553 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 15:56:01,559 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-23 15:56:01,559 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 15:56:01,594 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-23 15:56:01,595 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-11-23 15:56:01,598 INFO L87 Difference]: Start difference. First operand has 26 states, 17 states have (on average 1.3529411764705883) internal successors, (23), 18 states have internal predecessors, (23), 5 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) Second operand has 5 states, 4 states have (on average 1.75) internal successors, (7), 4 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-11-23 15:56:01,723 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 15:56:01,723 INFO L93 Difference]: Finished difference Result 34 states and 43 transitions. [2022-11-23 15:56:01,725 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-11-23 15:56:01,727 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 1.75) internal successors, (7), 4 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 9 [2022-11-23 15:56:01,727 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 15:56:01,737 INFO L225 Difference]: With dead ends: 34 [2022-11-23 15:56:01,738 INFO L226 Difference]: Without dead ends: 26 [2022-11-23 15:56:01,742 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2022-11-23 15:56:01,746 INFO L413 NwaCegarLoop]: 23 mSDtfsCounter, 13 mSDsluCounter, 43 mSDsCounter, 0 mSdLazyCounter, 44 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 66 SdHoareTripleChecker+Invalid, 44 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 44 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-23 15:56:01,747 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [16 Valid, 66 Invalid, 44 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 44 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-23 15:56:01,769 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2022-11-23 15:56:01,793 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2022-11-23 15:56:01,795 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 17 states have (on average 1.2352941176470589) internal successors, (21), 18 states have internal predecessors, (21), 5 states have call successors, (5), 2 states have call predecessors, (5), 3 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) [2022-11-23 15:56:01,797 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 33 transitions. [2022-11-23 15:56:01,798 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 33 transitions. Word has length 9 [2022-11-23 15:56:01,799 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 15:56:01,799 INFO L495 AbstractCegarLoop]: Abstraction has 26 states and 33 transitions. [2022-11-23 15:56:01,799 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 1.75) internal successors, (7), 4 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-11-23 15:56:01,800 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 33 transitions. [2022-11-23 15:56:01,801 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2022-11-23 15:56:01,801 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 15:56:01,802 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 15:56:01,802 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-11-23 15:56:01,803 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 15:56:01,803 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 15:56:01,804 INFO L85 PathProgramCache]: Analyzing trace with hash 1328370967, now seen corresponding path program 1 times [2022-11-23 15:56:01,804 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 15:56:01,804 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1689234223] [2022-11-23 15:56:01,805 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:56:01,805 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 15:56:01,829 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:56:01,978 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 15:56:01,978 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 15:56:01,979 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1689234223] [2022-11-23 15:56:01,980 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1689234223] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 15:56:01,980 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-23 15:56:01,984 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-11-23 15:56:01,984 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1822550003] [2022-11-23 15:56:01,985 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 15:56:01,986 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-23 15:56:01,987 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 15:56:01,987 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-23 15:56:01,988 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-11-23 15:56:01,988 INFO L87 Difference]: Start difference. First operand 26 states and 33 transitions. Second operand has 5 states, 4 states have (on average 2.0) internal successors, (8), 4 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-11-23 15:56:02,068 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 15:56:02,068 INFO L93 Difference]: Finished difference Result 32 states and 40 transitions. [2022-11-23 15:56:02,069 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-11-23 15:56:02,069 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 2.0) internal successors, (8), 4 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 10 [2022-11-23 15:56:02,070 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 15:56:02,071 INFO L225 Difference]: With dead ends: 32 [2022-11-23 15:56:02,071 INFO L226 Difference]: Without dead ends: 28 [2022-11-23 15:56:02,072 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 [2022-11-23 15:56:02,074 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, 0.1s IncrementalHoareTripleChecker+Time [2022-11-23 15:56:02,075 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [13 Valid, 63 Invalid, 41 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 40 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-23 15:56:02,076 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2022-11-23 15:56:02,083 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 26. [2022-11-23 15:56:02,083 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 17 states have (on average 1.2352941176470589) internal successors, (21), 18 states have internal predecessors, (21), 5 states have call successors, (5), 2 states have call predecessors, (5), 3 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) [2022-11-23 15:56:02,085 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 33 transitions. [2022-11-23 15:56:02,085 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 33 transitions. Word has length 10 [2022-11-23 15:56:02,086 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 15:56:02,086 INFO L495 AbstractCegarLoop]: Abstraction has 26 states and 33 transitions. [2022-11-23 15:56:02,086 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 2.0) internal successors, (8), 4 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-11-23 15:56:02,087 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 33 transitions. [2022-11-23 15:56:02,088 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2022-11-23 15:56:02,088 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 15:56:02,088 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 15:56:02,089 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-11-23 15:56:02,089 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 15:56:02,090 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 15:56:02,090 INFO L85 PathProgramCache]: Analyzing trace with hash -1296553538, now seen corresponding path program 1 times [2022-11-23 15:56:02,090 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 15:56:02,091 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [269360336] [2022-11-23 15:56:02,091 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:56:02,091 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 15:56:02,113 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:56:02,252 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-23 15:56:02,252 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 15:56:02,253 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [269360336] [2022-11-23 15:56:02,253 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [269360336] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 15:56:02,253 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [145254890] [2022-11-23 15:56:02,254 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:56:02,254 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:56:02,254 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af79cf74-59e5-490f-9e12-dca361e5b163/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 15:56:02,258 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af79cf74-59e5-490f-9e12-dca361e5b163/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 15:56:02,275 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af79cf74-59e5-490f-9e12-dca361e5b163/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-11-23 15:56:02,368 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:56:02,371 INFO L263 TraceCheckSpWp]: Trace formula consists of 74 conjuncts, 6 conjunts are in the unsatisfiable core [2022-11-23 15:56:02,390 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 15:56:02,588 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-23 15:56:02,589 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 15:56:02,959 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-23 15:56:02,961 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [145254890] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 15:56:02,967 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [488816283] [2022-11-23 15:56:03,008 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2022-11-23 15:56:03,008 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 15:56:03,012 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 15:56:03,018 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 15:56:03,018 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 15:56:03,122 INFO L197 IcfgInterpreter]: Interpreting procedure fibo1 with input of size 39 for LOIs [2022-11-23 15:56:03,177 INFO L197 IcfgInterpreter]: Interpreting procedure fibo2 with input of size 39 for LOIs [2022-11-23 15:56:03,189 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 15:56:03,589 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSifa [488816283] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 15:56:03,589 INFO L184 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2022-11-23 15:56:03,590 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [6, 7, 7] total 17 [2022-11-23 15:56:03,590 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [590754183] [2022-11-23 15:56:03,591 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 15:56:03,591 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-11-23 15:56:03,591 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 15:56:03,592 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-11-23 15:56:03,592 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=224, Unknown=0, NotChecked=0, Total=272 [2022-11-23 15:56:03,593 INFO L87 Difference]: Start difference. First operand 26 states and 33 transitions. Second operand has 7 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 4 states have internal predecessors, (13), 3 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (3), 1 states have call predecessors, (3), 3 states have call successors, (3) [2022-11-23 15:56:03,720 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 15:56:03,720 INFO L93 Difference]: Finished difference Result 68 states and 91 transitions. [2022-11-23 15:56:03,721 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-11-23 15:56:03,721 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 4 states have internal predecessors, (13), 3 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (3), 1 states have call predecessors, (3), 3 states have call successors, (3) Word has length 22 [2022-11-23 15:56:03,721 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 15:56:03,722 INFO L225 Difference]: With dead ends: 68 [2022-11-23 15:56:03,723 INFO L226 Difference]: Without dead ends: 44 [2022-11-23 15:56:03,724 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 52 SyntacticMatches, 4 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 53 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=48, Invalid=224, Unknown=0, NotChecked=0, Total=272 [2022-11-23 15:56:03,725 INFO L413 NwaCegarLoop]: 30 mSDtfsCounter, 23 mSDsluCounter, 62 mSDsCounter, 0 mSdLazyCounter, 52 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 28 SdHoareTripleChecker+Valid, 92 SdHoareTripleChecker+Invalid, 59 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 52 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-23 15:56:03,726 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [28 Valid, 92 Invalid, 59 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 52 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-23 15:56:03,732 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2022-11-23 15:56:03,744 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 42. [2022-11-23 15:56:03,744 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 28 states have (on average 1.1428571428571428) internal successors, (32), 28 states have internal predecessors, (32), 9 states have call successors, (9), 4 states have call predecessors, (9), 4 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2022-11-23 15:56:03,746 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 50 transitions. [2022-11-23 15:56:03,747 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 50 transitions. Word has length 22 [2022-11-23 15:56:03,747 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 15:56:03,747 INFO L495 AbstractCegarLoop]: Abstraction has 42 states and 50 transitions. [2022-11-23 15:56:03,748 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 4 states have internal predecessors, (13), 3 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (3), 1 states have call predecessors, (3), 3 states have call successors, (3) [2022-11-23 15:56:03,748 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 50 transitions. [2022-11-23 15:56:03,750 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2022-11-23 15:56:03,750 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 15:56:03,750 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 15:56:03,763 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af79cf74-59e5-490f-9e12-dca361e5b163/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-11-23 15:56:03,956 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af79cf74-59e5-490f-9e12-dca361e5b163/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:56:03,957 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 15:56:03,957 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 15:56:03,958 INFO L85 PathProgramCache]: Analyzing trace with hash -28918515, now seen corresponding path program 1 times [2022-11-23 15:56:03,958 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 15:56:03,958 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [86091943] [2022-11-23 15:56:03,958 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:56:03,959 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 15:56:03,990 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:56:04,203 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 5 proven. 5 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-23 15:56:04,203 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 15:56:04,205 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [86091943] [2022-11-23 15:56:04,206 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [86091943] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 15:56:04,206 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [631355511] [2022-11-23 15:56:04,206 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:56:04,206 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:56:04,207 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af79cf74-59e5-490f-9e12-dca361e5b163/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 15:56:04,208 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af79cf74-59e5-490f-9e12-dca361e5b163/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 15:56:04,215 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af79cf74-59e5-490f-9e12-dca361e5b163/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-11-23 15:56:04,264 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:56:04,265 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 8 conjunts are in the unsatisfiable core [2022-11-23 15:56:04,267 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 15:56:04,374 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2022-11-23 15:56:04,374 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 15:56:04,802 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 2 proven. 10 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-23 15:56:04,802 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [631355511] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 15:56:04,802 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1849190626] [2022-11-23 15:56:04,805 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2022-11-23 15:56:04,805 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 15:56:04,807 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-23 15:56:04,808 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 15:56:04,808 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 8, 9] total 14 [2022-11-23 15:56:04,809 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [617710052] [2022-11-23 15:56:04,809 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 15:56:04,809 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-11-23 15:56:04,810 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 15:56:04,810 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-11-23 15:56:04,810 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2022-11-23 15:56:04,810 INFO L87 Difference]: Start difference. First operand 42 states and 50 transitions. Second operand has 14 states, 11 states have (on average 4.0) internal successors, (44), 14 states have internal predecessors, (44), 11 states have call successors, (13), 1 states have call predecessors, (13), 5 states have return successors, (13), 3 states have call predecessors, (13), 11 states have call successors, (13) [2022-11-23 15:56:05,107 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 15:56:05,107 INFO L93 Difference]: Finished difference Result 85 states and 121 transitions. [2022-11-23 15:56:05,108 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-11-23 15:56:05,108 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 11 states have (on average 4.0) internal successors, (44), 14 states have internal predecessors, (44), 11 states have call successors, (13), 1 states have call predecessors, (13), 5 states have return successors, (13), 3 states have call predecessors, (13), 11 states have call successors, (13) Word has length 35 [2022-11-23 15:56:05,109 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 15:56:05,117 INFO L225 Difference]: With dead ends: 85 [2022-11-23 15:56:05,117 INFO L226 Difference]: Without dead ends: 53 [2022-11-23 15:56:05,120 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 63 SyntacticMatches, 3 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=75, Invalid=305, Unknown=0, NotChecked=0, Total=380 [2022-11-23 15:56:05,125 INFO L413 NwaCegarLoop]: 18 mSDtfsCounter, 38 mSDsluCounter, 77 mSDsCounter, 0 mSdLazyCounter, 204 mSolverCounterSat, 27 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 43 SdHoareTripleChecker+Valid, 95 SdHoareTripleChecker+Invalid, 231 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 27 IncrementalHoareTripleChecker+Valid, 204 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-23 15:56:05,127 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [43 Valid, 95 Invalid, 231 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [27 Valid, 204 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-23 15:56:05,128 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2022-11-23 15:56:05,147 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 44. [2022-11-23 15:56:05,147 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 44 states, 29 states have (on average 1.1379310344827587) internal successors, (33), 30 states have internal predecessors, (33), 9 states have call successors, (9), 4 states have call predecessors, (9), 5 states have return successors, (11), 9 states have call predecessors, (11), 9 states have call successors, (11) [2022-11-23 15:56:05,152 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 53 transitions. [2022-11-23 15:56:05,154 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 53 transitions. Word has length 35 [2022-11-23 15:56:05,154 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 15:56:05,154 INFO L495 AbstractCegarLoop]: Abstraction has 44 states and 53 transitions. [2022-11-23 15:56:05,155 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 11 states have (on average 4.0) internal successors, (44), 14 states have internal predecessors, (44), 11 states have call successors, (13), 1 states have call predecessors, (13), 5 states have return successors, (13), 3 states have call predecessors, (13), 11 states have call successors, (13) [2022-11-23 15:56:05,163 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 53 transitions. [2022-11-23 15:56:05,165 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2022-11-23 15:56:05,165 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 15:56:05,165 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 15:56:05,179 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af79cf74-59e5-490f-9e12-dca361e5b163/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-11-23 15:56:05,374 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af79cf74-59e5-490f-9e12-dca361e5b163/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable3 [2022-11-23 15:56:05,374 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 15:56:05,375 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 15:56:05,375 INFO L85 PathProgramCache]: Analyzing trace with hash -243412115, now seen corresponding path program 1 times [2022-11-23 15:56:05,375 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 15:56:05,375 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [837591724] [2022-11-23 15:56:05,375 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:56:05,375 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 15:56:05,391 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:56:05,565 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 4 proven. 3 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-23 15:56:05,565 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 15:56:05,565 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [837591724] [2022-11-23 15:56:05,566 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [837591724] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 15:56:05,566 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [852272094] [2022-11-23 15:56:05,566 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:56:05,566 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:56:05,566 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af79cf74-59e5-490f-9e12-dca361e5b163/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 15:56:05,568 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af79cf74-59e5-490f-9e12-dca361e5b163/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 15:56:05,602 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af79cf74-59e5-490f-9e12-dca361e5b163/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-11-23 15:56:05,640 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:56:05,641 INFO L263 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 8 conjunts are in the unsatisfiable core [2022-11-23 15:56:05,643 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 15:56:05,745 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-23 15:56:05,745 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 15:56:06,171 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 2 proven. 11 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-23 15:56:06,171 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [852272094] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 15:56:06,171 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [587614250] [2022-11-23 15:56:06,175 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2022-11-23 15:56:06,175 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 15:56:06,176 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-23 15:56:06,178 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 15:56:06,178 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8, 9] total 18 [2022-11-23 15:56:06,178 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [463941873] [2022-11-23 15:56:06,179 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 15:56:06,180 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2022-11-23 15:56:06,180 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 15:56:06,180 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2022-11-23 15:56:06,181 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=257, Unknown=0, NotChecked=0, Total=306 [2022-11-23 15:56:06,181 INFO L87 Difference]: Start difference. First operand 44 states and 53 transitions. Second operand has 18 states, 16 states have (on average 3.0625) internal successors, (49), 18 states have internal predecessors, (49), 11 states have call successors, (13), 1 states have call predecessors, (13), 7 states have return successors, (13), 6 states have call predecessors, (13), 11 states have call successors, (13) [2022-11-23 15:56:06,736 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 15:56:06,736 INFO L93 Difference]: Finished difference Result 121 states and 203 transitions. [2022-11-23 15:56:06,736 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2022-11-23 15:56:06,737 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 16 states have (on average 3.0625) internal successors, (49), 18 states have internal predecessors, (49), 11 states have call successors, (13), 1 states have call predecessors, (13), 7 states have return successors, (13), 6 states have call predecessors, (13), 11 states have call successors, (13) Word has length 36 [2022-11-23 15:56:06,737 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 15:56:06,739 INFO L225 Difference]: With dead ends: 121 [2022-11-23 15:56:06,739 INFO L226 Difference]: Without dead ends: 77 [2022-11-23 15:56:06,741 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 68 SyntacticMatches, 3 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 125 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=142, Invalid=670, Unknown=0, NotChecked=0, Total=812 [2022-11-23 15:56:06,742 INFO L413 NwaCegarLoop]: 27 mSDtfsCounter, 63 mSDsluCounter, 139 mSDsCounter, 0 mSdLazyCounter, 420 mSolverCounterSat, 74 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 67 SdHoareTripleChecker+Valid, 166 SdHoareTripleChecker+Invalid, 494 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 74 IncrementalHoareTripleChecker+Valid, 420 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-23 15:56:06,742 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [67 Valid, 166 Invalid, 494 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [74 Valid, 420 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-23 15:56:06,743 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2022-11-23 15:56:06,759 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 63. [2022-11-23 15:56:06,760 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 40 states have (on average 1.15) internal successors, (46), 43 states have internal predecessors, (46), 14 states have call successors, (14), 5 states have call predecessors, (14), 8 states have return successors, (31), 14 states have call predecessors, (31), 14 states have call successors, (31) [2022-11-23 15:56:06,761 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 91 transitions. [2022-11-23 15:56:06,762 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 91 transitions. Word has length 36 [2022-11-23 15:56:06,762 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 15:56:06,762 INFO L495 AbstractCegarLoop]: Abstraction has 63 states and 91 transitions. [2022-11-23 15:56:06,762 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 16 states have (on average 3.0625) internal successors, (49), 18 states have internal predecessors, (49), 11 states have call successors, (13), 1 states have call predecessors, (13), 7 states have return successors, (13), 6 states have call predecessors, (13), 11 states have call successors, (13) [2022-11-23 15:56:06,763 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 91 transitions. [2022-11-23 15:56:06,765 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2022-11-23 15:56:06,765 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 15:56:06,765 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 15:56:06,780 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af79cf74-59e5-490f-9e12-dca361e5b163/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-11-23 15:56:06,971 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af79cf74-59e5-490f-9e12-dca361e5b163/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:56:06,972 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 15:56:06,972 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 15:56:06,972 INFO L85 PathProgramCache]: Analyzing trace with hash 403750738, now seen corresponding path program 1 times [2022-11-23 15:56:06,972 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 15:56:06,973 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [395893746] [2022-11-23 15:56:06,973 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:56:06,973 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 15:56:07,010 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:56:07,209 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 12 proven. 12 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2022-11-23 15:56:07,209 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 15:56:07,210 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [395893746] [2022-11-23 15:56:07,210 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [395893746] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 15:56:07,210 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [280244704] [2022-11-23 15:56:07,210 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:56:07,211 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:56:07,211 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af79cf74-59e5-490f-9e12-dca361e5b163/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 15:56:07,212 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af79cf74-59e5-490f-9e12-dca361e5b163/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 15:56:07,218 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af79cf74-59e5-490f-9e12-dca361e5b163/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-11-23 15:56:07,297 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:56:07,299 INFO L263 TraceCheckSpWp]: Trace formula consists of 136 conjuncts, 10 conjunts are in the unsatisfiable core [2022-11-23 15:56:07,304 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 15:56:07,419 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 4 proven. 23 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2022-11-23 15:56:07,419 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 15:56:08,150 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 4 proven. 28 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-11-23 15:56:08,151 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [280244704] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 15:56:08,151 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1735953220] [2022-11-23 15:56:08,156 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2022-11-23 15:56:08,156 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 15:56:08,157 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-23 15:56:08,157 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 15:56:08,157 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9, 11] total 17 [2022-11-23 15:56:08,158 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1312472896] [2022-11-23 15:56:08,160 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 15:56:08,162 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2022-11-23 15:56:08,162 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 15:56:08,163 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2022-11-23 15:56:08,163 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2022-11-23 15:56:08,164 INFO L87 Difference]: Start difference. First operand 63 states and 91 transitions. Second operand has 17 states, 15 states have (on average 3.6) internal successors, (54), 17 states have internal predecessors, (54), 12 states have call successors, (14), 1 states have call predecessors, (14), 8 states have return successors, (18), 8 states have call predecessors, (18), 12 states have call successors, (18) [2022-11-23 15:56:08,489 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 15:56:08,490 INFO L93 Difference]: Finished difference Result 119 states and 203 transitions. [2022-11-23 15:56:08,490 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-11-23 15:56:08,491 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 15 states have (on average 3.6) internal successors, (54), 17 states have internal predecessors, (54), 12 states have call successors, (14), 1 states have call predecessors, (14), 8 states have return successors, (18), 8 states have call predecessors, (18), 12 states have call successors, (18) Word has length 50 [2022-11-23 15:56:08,491 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 15:56:08,499 INFO L225 Difference]: With dead ends: 119 [2022-11-23 15:56:08,499 INFO L226 Difference]: Without dead ends: 97 [2022-11-23 15:56:08,502 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 117 GetRequests, 91 SyntacticMatches, 4 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 108 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=115, Invalid=437, Unknown=0, NotChecked=0, Total=552 [2022-11-23 15:56:08,504 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 59 mSDsluCounter, 57 mSDsCounter, 0 mSdLazyCounter, 137 mSolverCounterSat, 68 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 72 SdHoareTripleChecker+Valid, 73 SdHoareTripleChecker+Invalid, 205 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 68 IncrementalHoareTripleChecker+Valid, 137 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-23 15:56:08,505 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [72 Valid, 73 Invalid, 205 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [68 Valid, 137 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-23 15:56:08,507 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2022-11-23 15:56:08,532 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 72. [2022-11-23 15:56:08,532 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 72 states, 46 states have (on average 1.1304347826086956) internal successors, (52), 49 states have internal predecessors, (52), 14 states have call successors, (14), 5 states have call predecessors, (14), 11 states have return successors, (39), 17 states have call predecessors, (39), 14 states have call successors, (39) [2022-11-23 15:56:08,534 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 105 transitions. [2022-11-23 15:56:08,535 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 105 transitions. Word has length 50 [2022-11-23 15:56:08,535 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 15:56:08,535 INFO L495 AbstractCegarLoop]: Abstraction has 72 states and 105 transitions. [2022-11-23 15:56:08,536 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 15 states have (on average 3.6) internal successors, (54), 17 states have internal predecessors, (54), 12 states have call successors, (14), 1 states have call predecessors, (14), 8 states have return successors, (18), 8 states have call predecessors, (18), 12 states have call successors, (18) [2022-11-23 15:56:08,536 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 105 transitions. [2022-11-23 15:56:08,539 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2022-11-23 15:56:08,539 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 15:56:08,539 INFO L195 NwaCegarLoop]: trace histogram [7, 7, 6, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 15:56:08,561 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af79cf74-59e5-490f-9e12-dca361e5b163/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-11-23 15:56:08,746 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af79cf74-59e5-490f-9e12-dca361e5b163/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2022-11-23 15:56:08,746 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 15:56:08,747 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 15:56:08,747 INFO L85 PathProgramCache]: Analyzing trace with hash 1766289300, now seen corresponding path program 1 times [2022-11-23 15:56:08,747 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 15:56:08,747 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [206918749] [2022-11-23 15:56:08,747 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:56:08,747 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 15:56:08,768 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:56:08,993 INFO L134 CoverageAnalysis]: Checked inductivity of 145 backedges. 39 proven. 42 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2022-11-23 15:56:08,994 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 15:56:08,994 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [206918749] [2022-11-23 15:56:08,994 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [206918749] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 15:56:08,994 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1344594523] [2022-11-23 15:56:08,995 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:56:08,995 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:56:08,995 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af79cf74-59e5-490f-9e12-dca361e5b163/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 15:56:08,996 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af79cf74-59e5-490f-9e12-dca361e5b163/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 15:56:09,010 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af79cf74-59e5-490f-9e12-dca361e5b163/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-11-23 15:56:09,097 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:56:09,125 INFO L263 TraceCheckSpWp]: Trace formula consists of 200 conjuncts, 12 conjunts are in the unsatisfiable core [2022-11-23 15:56:09,128 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 15:56:09,328 INFO L134 CoverageAnalysis]: Checked inductivity of 145 backedges. 12 proven. 71 refuted. 0 times theorem prover too weak. 62 trivial. 0 not checked. [2022-11-23 15:56:09,328 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 15:56:10,537 INFO L134 CoverageAnalysis]: Checked inductivity of 145 backedges. 12 proven. 81 refuted. 0 times theorem prover too weak. 52 trivial. 0 not checked. [2022-11-23 15:56:10,538 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1344594523] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 15:56:10,538 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2002124027] [2022-11-23 15:56:10,544 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2022-11-23 15:56:10,545 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 15:56:10,546 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-23 15:56:10,547 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 15:56:10,547 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10, 13] total 23 [2022-11-23 15:56:10,548 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1814514990] [2022-11-23 15:56:10,548 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 15:56:10,551 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2022-11-23 15:56:10,551 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 15:56:10,551 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2022-11-23 15:56:10,552 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=439, Unknown=0, NotChecked=0, Total=506 [2022-11-23 15:56:10,555 INFO L87 Difference]: Start difference. First operand 72 states and 105 transitions. Second operand has 23 states, 21 states have (on average 3.4285714285714284) internal successors, (72), 23 states have internal predecessors, (72), 18 states have call successors, (22), 1 states have call predecessors, (22), 9 states have return successors, (25), 10 states have call predecessors, (25), 18 states have call successors, (25) [2022-11-23 15:56:11,637 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 15:56:11,637 INFO L93 Difference]: Finished difference Result 204 states and 411 transitions. [2022-11-23 15:56:11,638 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2022-11-23 15:56:11,638 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 21 states have (on average 3.4285714285714284) internal successors, (72), 23 states have internal predecessors, (72), 18 states have call successors, (22), 1 states have call predecessors, (22), 9 states have return successors, (25), 10 states have call predecessors, (25), 18 states have call successors, (25) Word has length 79 [2022-11-23 15:56:11,639 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 15:56:11,641 INFO L225 Difference]: With dead ends: 204 [2022-11-23 15:56:11,642 INFO L226 Difference]: Without dead ends: 115 [2022-11-23 15:56:11,647 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 190 GetRequests, 147 SyntacticMatches, 5 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 252 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=263, Invalid=1297, Unknown=0, NotChecked=0, Total=1560 [2022-11-23 15:56:11,648 INFO L413 NwaCegarLoop]: 35 mSDtfsCounter, 106 mSDsluCounter, 210 mSDsCounter, 0 mSdLazyCounter, 700 mSolverCounterSat, 134 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 107 SdHoareTripleChecker+Valid, 245 SdHoareTripleChecker+Invalid, 834 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 134 IncrementalHoareTripleChecker+Valid, 700 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-11-23 15:56:11,648 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [107 Valid, 245 Invalid, 834 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [134 Valid, 700 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-11-23 15:56:11,649 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 115 states. [2022-11-23 15:56:11,672 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 115 to 98. [2022-11-23 15:56:11,673 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 98 states, 64 states have (on average 1.171875) internal successors, (75), 66 states have internal predecessors, (75), 19 states have call successors, (19), 8 states have call predecessors, (19), 14 states have return successors, (50), 23 states have call predecessors, (50), 19 states have call successors, (50) [2022-11-23 15:56:11,674 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 144 transitions. [2022-11-23 15:56:11,675 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 144 transitions. Word has length 79 [2022-11-23 15:56:11,675 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 15:56:11,676 INFO L495 AbstractCegarLoop]: Abstraction has 98 states and 144 transitions. [2022-11-23 15:56:11,676 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 21 states have (on average 3.4285714285714284) internal successors, (72), 23 states have internal predecessors, (72), 18 states have call successors, (22), 1 states have call predecessors, (22), 9 states have return successors, (25), 10 states have call predecessors, (25), 18 states have call successors, (25) [2022-11-23 15:56:11,676 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 144 transitions. [2022-11-23 15:56:11,686 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 143 [2022-11-23 15:56:11,691 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 15:56:11,692 INFO L195 NwaCegarLoop]: trace histogram [12, 12, 9, 9, 7, 6, 6, 6, 6, 6, 6, 6, 6, 6, 4, 4, 4, 4, 4, 4, 4, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 15:56:11,698 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af79cf74-59e5-490f-9e12-dca361e5b163/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-11-23 15:56:11,893 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af79cf74-59e5-490f-9e12-dca361e5b163/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:56:11,894 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 15:56:11,894 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 15:56:11,895 INFO L85 PathProgramCache]: Analyzing trace with hash 1596421381, now seen corresponding path program 1 times [2022-11-23 15:56:11,895 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 15:56:11,895 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1683392771] [2022-11-23 15:56:11,895 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:56:11,896 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 15:56:11,940 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:56:12,121 INFO L134 CoverageAnalysis]: Checked inductivity of 528 backedges. 39 proven. 116 refuted. 0 times theorem prover too weak. 373 trivial. 0 not checked. [2022-11-23 15:56:12,122 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 15:56:12,122 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1683392771] [2022-11-23 15:56:12,122 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1683392771] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 15:56:12,122 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [650793034] [2022-11-23 15:56:12,123 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:56:12,123 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:56:12,123 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af79cf74-59e5-490f-9e12-dca361e5b163/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 15:56:12,124 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af79cf74-59e5-490f-9e12-dca361e5b163/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 15:56:12,147 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af79cf74-59e5-490f-9e12-dca361e5b163/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-11-23 15:56:12,254 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:56:12,256 INFO L263 TraceCheckSpWp]: Trace formula consists of 341 conjuncts, 14 conjunts are in the unsatisfiable core [2022-11-23 15:56:12,260 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 15:56:12,481 INFO L134 CoverageAnalysis]: Checked inductivity of 528 backedges. 29 proven. 202 refuted. 0 times theorem prover too weak. 297 trivial. 0 not checked. [2022-11-23 15:56:12,481 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 15:56:14,172 INFO L134 CoverageAnalysis]: Checked inductivity of 528 backedges. 29 proven. 216 refuted. 0 times theorem prover too weak. 283 trivial. 0 not checked. [2022-11-23 15:56:14,172 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [650793034] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 15:56:14,172 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1014741626] [2022-11-23 15:56:14,176 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2022-11-23 15:56:14,176 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 15:56:14,177 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-23 15:56:14,178 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 15:56:14,179 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 11, 15] total 20 [2022-11-23 15:56:14,179 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1069775230] [2022-11-23 15:56:14,179 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 15:56:14,180 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2022-11-23 15:56:14,180 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 15:56:14,181 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2022-11-23 15:56:14,181 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=64, Invalid=316, Unknown=0, NotChecked=0, Total=380 [2022-11-23 15:56:14,182 INFO L87 Difference]: Start difference. First operand 98 states and 144 transitions. Second operand has 20 states, 17 states have (on average 4.117647058823529) internal successors, (70), 20 states have internal predecessors, (70), 17 states have call successors, (22), 1 states have call predecessors, (22), 8 states have return successors, (27), 7 states have call predecessors, (27), 17 states have call successors, (27) [2022-11-23 15:56:14,567 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 15:56:14,567 INFO L93 Difference]: Finished difference Result 191 states and 315 transitions. [2022-11-23 15:56:14,568 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-11-23 15:56:14,568 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 17 states have (on average 4.117647058823529) internal successors, (70), 20 states have internal predecessors, (70), 17 states have call successors, (22), 1 states have call predecessors, (22), 8 states have return successors, (27), 7 states have call predecessors, (27), 17 states have call successors, (27) Word has length 142 [2022-11-23 15:56:14,569 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 15:56:14,570 INFO L225 Difference]: With dead ends: 191 [2022-11-23 15:56:14,570 INFO L226 Difference]: Without dead ends: 103 [2022-11-23 15:56:14,572 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 298 GetRequests, 265 SyntacticMatches, 6 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 138 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=152, Invalid=660, Unknown=0, NotChecked=0, Total=812 [2022-11-23 15:56:14,573 INFO L413 NwaCegarLoop]: 18 mSDtfsCounter, 53 mSDsluCounter, 117 mSDsCounter, 0 mSdLazyCounter, 272 mSolverCounterSat, 46 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 61 SdHoareTripleChecker+Valid, 135 SdHoareTripleChecker+Invalid, 318 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 46 IncrementalHoareTripleChecker+Valid, 272 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-23 15:56:14,573 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [61 Valid, 135 Invalid, 318 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [46 Valid, 272 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-23 15:56:14,574 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2022-11-23 15:56:14,595 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 100. [2022-11-23 15:56:14,595 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 100 states, 65 states have (on average 1.1692307692307693) internal successors, (76), 68 states have internal predecessors, (76), 19 states have call successors, (19), 8 states have call predecessors, (19), 15 states have return successors, (48), 23 states have call predecessors, (48), 19 states have call successors, (48) [2022-11-23 15:56:14,597 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 143 transitions. [2022-11-23 15:56:14,598 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 143 transitions. Word has length 142 [2022-11-23 15:56:14,598 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 15:56:14,598 INFO L495 AbstractCegarLoop]: Abstraction has 100 states and 143 transitions. [2022-11-23 15:56:14,599 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 17 states have (on average 4.117647058823529) internal successors, (70), 20 states have internal predecessors, (70), 17 states have call successors, (22), 1 states have call predecessors, (22), 8 states have return successors, (27), 7 states have call predecessors, (27), 17 states have call successors, (27) [2022-11-23 15:56:14,599 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 143 transitions. [2022-11-23 15:56:14,601 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 160 [2022-11-23 15:56:14,602 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 15:56:14,602 INFO L195 NwaCegarLoop]: trace histogram [12, 12, 11, 11, 10, 8, 6, 6, 6, 6, 6, 6, 6, 5, 5, 5, 5, 5, 5, 5, 5, 3, 2, 2, 1, 1, 1, 1, 1, 1] [2022-11-23 15:56:14,610 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af79cf74-59e5-490f-9e12-dca361e5b163/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-11-23 15:56:14,809 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af79cf74-59e5-490f-9e12-dca361e5b163/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:56:14,809 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 15:56:14,809 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 15:56:14,809 INFO L85 PathProgramCache]: Analyzing trace with hash 1303291698, now seen corresponding path program 2 times [2022-11-23 15:56:14,809 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 15:56:14,810 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [18269435] [2022-11-23 15:56:14,810 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:56:14,810 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 15:56:14,838 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:56:15,184 INFO L134 CoverageAnalysis]: Checked inductivity of 657 backedges. 47 proven. 183 refuted. 0 times theorem prover too weak. 427 trivial. 0 not checked. [2022-11-23 15:56:15,184 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 15:56:15,184 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [18269435] [2022-11-23 15:56:15,185 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [18269435] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 15:56:15,185 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [585451510] [2022-11-23 15:56:15,185 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-23 15:56:15,185 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:56:15,186 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af79cf74-59e5-490f-9e12-dca361e5b163/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 15:56:15,187 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af79cf74-59e5-490f-9e12-dca361e5b163/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 15:56:15,222 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af79cf74-59e5-490f-9e12-dca361e5b163/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-11-23 15:56:15,339 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2022-11-23 15:56:15,339 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 15:56:15,341 INFO L263 TraceCheckSpWp]: Trace formula consists of 198 conjuncts, 10 conjunts are in the unsatisfiable core [2022-11-23 15:56:15,351 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 15:56:15,449 INFO L134 CoverageAnalysis]: Checked inductivity of 657 backedges. 160 proven. 37 refuted. 0 times theorem prover too weak. 460 trivial. 0 not checked. [2022-11-23 15:56:15,450 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 15:56:16,363 INFO L134 CoverageAnalysis]: Checked inductivity of 657 backedges. 162 proven. 40 refuted. 0 times theorem prover too weak. 455 trivial. 0 not checked. [2022-11-23 15:56:16,363 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [585451510] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 15:56:16,363 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1948588494] [2022-11-23 15:56:16,373 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2022-11-23 15:56:16,374 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 15:56:16,375 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-23 15:56:16,376 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 15:56:16,376 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9, 11] total 18 [2022-11-23 15:56:16,379 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [561486171] [2022-11-23 15:56:16,379 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 15:56:16,381 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2022-11-23 15:56:16,381 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 15:56:16,381 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2022-11-23 15:56:16,382 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=244, Unknown=0, NotChecked=0, Total=306 [2022-11-23 15:56:16,383 INFO L87 Difference]: Start difference. First operand 100 states and 143 transitions. Second operand has 18 states, 16 states have (on average 3.9375) internal successors, (63), 18 states have internal predecessors, (63), 12 states have call successors, (19), 1 states have call predecessors, (19), 9 states have return successors, (25), 12 states have call predecessors, (25), 12 states have call successors, (25) [2022-11-23 15:56:16,728 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 15:56:16,728 INFO L93 Difference]: Finished difference Result 140 states and 225 transitions. [2022-11-23 15:56:16,729 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-11-23 15:56:16,729 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 16 states have (on average 3.9375) internal successors, (63), 18 states have internal predecessors, (63), 12 states have call successors, (19), 1 states have call predecessors, (19), 9 states have return successors, (25), 12 states have call predecessors, (25), 12 states have call successors, (25) Word has length 159 [2022-11-23 15:56:16,730 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 15:56:16,732 INFO L225 Difference]: With dead ends: 140 [2022-11-23 15:56:16,732 INFO L226 Difference]: Without dead ends: 123 [2022-11-23 15:56:16,733 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 337 GetRequests, 309 SyntacticMatches, 4 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 128 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=136, Invalid=514, Unknown=0, NotChecked=0, Total=650 [2022-11-23 15:56:16,734 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 53 mSDsluCounter, 100 mSDsCounter, 0 mSdLazyCounter, 235 mSolverCounterSat, 53 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 61 SdHoareTripleChecker+Valid, 116 SdHoareTripleChecker+Invalid, 288 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 53 IncrementalHoareTripleChecker+Valid, 235 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-23 15:56:16,734 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [61 Valid, 116 Invalid, 288 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [53 Valid, 235 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-23 15:56:16,734 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 123 states. [2022-11-23 15:56:16,763 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 123 to 110. [2022-11-23 15:56:16,770 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 110 states, 71 states have (on average 1.1549295774647887) internal successors, (82), 74 states have internal predecessors, (82), 21 states have call successors, (21), 8 states have call predecessors, (21), 17 states have return successors, (58), 27 states have call predecessors, (58), 21 states have call successors, (58) [2022-11-23 15:56:16,772 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 110 states to 110 states and 161 transitions. [2022-11-23 15:56:16,773 INFO L78 Accepts]: Start accepts. Automaton has 110 states and 161 transitions. Word has length 159 [2022-11-23 15:56:16,774 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 15:56:16,774 INFO L495 AbstractCegarLoop]: Abstraction has 110 states and 161 transitions. [2022-11-23 15:56:16,775 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 16 states have (on average 3.9375) internal successors, (63), 18 states have internal predecessors, (63), 12 states have call successors, (19), 1 states have call predecessors, (19), 9 states have return successors, (25), 12 states have call predecessors, (25), 12 states have call successors, (25) [2022-11-23 15:56:16,775 INFO L276 IsEmpty]: Start isEmpty. Operand 110 states and 161 transitions. [2022-11-23 15:56:16,783 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 241 [2022-11-23 15:56:16,784 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 15:56:16,784 INFO L195 NwaCegarLoop]: trace histogram [18, 18, 17, 17, 14, 13, 9, 9, 9, 9, 9, 9, 9, 8, 8, 8, 8, 8, 8, 8, 6, 4, 4, 4, 1, 1, 1, 1, 1, 1] [2022-11-23 15:56:16,791 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af79cf74-59e5-490f-9e12-dca361e5b163/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2022-11-23 15:56:16,990 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af79cf74-59e5-490f-9e12-dca361e5b163/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:56:16,990 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 15:56:16,991 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 15:56:16,991 INFO L85 PathProgramCache]: Analyzing trace with hash 994120084, now seen corresponding path program 3 times [2022-11-23 15:56:16,991 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 15:56:16,991 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [370019762] [2022-11-23 15:56:16,991 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:56:16,991 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 15:56:17,054 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:56:17,512 INFO L134 CoverageAnalysis]: Checked inductivity of 1581 backedges. 62 proven. 406 refuted. 0 times theorem prover too weak. 1113 trivial. 0 not checked. [2022-11-23 15:56:17,513 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 15:56:17,513 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [370019762] [2022-11-23 15:56:17,513 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [370019762] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 15:56:17,513 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [749897733] [2022-11-23 15:56:17,514 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-23 15:56:17,514 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:56:17,514 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af79cf74-59e5-490f-9e12-dca361e5b163/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 15:56:17,515 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af79cf74-59e5-490f-9e12-dca361e5b163/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 15:56:17,524 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af79cf74-59e5-490f-9e12-dca361e5b163/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-11-23 15:56:17,706 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-23 15:56:17,707 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 15:56:17,709 INFO L263 TraceCheckSpWp]: Trace formula consists of 426 conjuncts, 18 conjunts are in the unsatisfiable core [2022-11-23 15:56:17,721 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 15:56:17,989 INFO L134 CoverageAnalysis]: Checked inductivity of 1581 backedges. 927 proven. 132 refuted. 0 times theorem prover too weak. 522 trivial. 0 not checked. [2022-11-23 15:56:17,989 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 15:56:20,467 INFO L134 CoverageAnalysis]: Checked inductivity of 1581 backedges. 150 proven. 531 refuted. 0 times theorem prover too weak. 900 trivial. 0 not checked. [2022-11-23 15:56:20,468 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [749897733] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 15:56:20,468 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1161201069] [2022-11-23 15:56:20,476 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2022-11-23 15:56:20,476 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 15:56:20,478 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-23 15:56:20,479 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 15:56:20,480 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15, 19] total 26 [2022-11-23 15:56:20,480 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1844572200] [2022-11-23 15:56:20,480 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 15:56:20,485 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2022-11-23 15:56:20,485 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 15:56:20,486 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2022-11-23 15:56:20,486 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=573, Unknown=0, NotChecked=0, Total=650 [2022-11-23 15:56:20,487 INFO L87 Difference]: Start difference. First operand 110 states and 161 transitions. Second operand has 26 states, 25 states have (on average 4.08) internal successors, (102), 26 states have internal predecessors, (102), 22 states have call successors, (30), 2 states have call predecessors, (30), 12 states have return successors, (36), 11 states have call predecessors, (36), 22 states have call successors, (36) [2022-11-23 15:56:21,683 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 15:56:21,683 INFO L93 Difference]: Finished difference Result 271 states and 523 transitions. [2022-11-23 15:56:21,684 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2022-11-23 15:56:21,684 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 25 states have (on average 4.08) internal successors, (102), 26 states have internal predecessors, (102), 22 states have call successors, (30), 2 states have call predecessors, (30), 12 states have return successors, (36), 11 states have call predecessors, (36), 22 states have call successors, (36) Word has length 240 [2022-11-23 15:56:21,685 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 15:56:21,687 INFO L225 Difference]: With dead ends: 271 [2022-11-23 15:56:21,688 INFO L226 Difference]: Without dead ends: 153 [2022-11-23 15:56:21,691 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 514 GetRequests, 460 SyntacticMatches, 9 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 383 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=355, Invalid=1807, Unknown=0, NotChecked=0, Total=2162 [2022-11-23 15:56:21,691 INFO L413 NwaCegarLoop]: 25 mSDtfsCounter, 151 mSDsluCounter, 211 mSDsCounter, 0 mSdLazyCounter, 879 mSolverCounterSat, 182 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 152 SdHoareTripleChecker+Valid, 236 SdHoareTripleChecker+Invalid, 1061 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 182 IncrementalHoareTripleChecker+Valid, 879 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-11-23 15:56:21,692 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [152 Valid, 236 Invalid, 1061 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [182 Valid, 879 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-11-23 15:56:21,693 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 153 states. [2022-11-23 15:56:21,713 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 153 to 138. [2022-11-23 15:56:21,714 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 138 states, 93 states have (on average 1.1505376344086022) internal successors, (107), 92 states have internal predecessors, (107), 26 states have call successors, (26), 15 states have call predecessors, (26), 18 states have return successors, (74), 30 states have call predecessors, (74), 26 states have call successors, (74) [2022-11-23 15:56:21,716 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 138 states to 138 states and 207 transitions. [2022-11-23 15:56:21,717 INFO L78 Accepts]: Start accepts. Automaton has 138 states and 207 transitions. Word has length 240 [2022-11-23 15:56:21,717 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 15:56:21,717 INFO L495 AbstractCegarLoop]: Abstraction has 138 states and 207 transitions. [2022-11-23 15:56:21,718 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 25 states have (on average 4.08) internal successors, (102), 26 states have internal predecessors, (102), 22 states have call successors, (30), 2 states have call predecessors, (30), 12 states have return successors, (36), 11 states have call predecessors, (36), 22 states have call successors, (36) [2022-11-23 15:56:21,718 INFO L276 IsEmpty]: Start isEmpty. Operand 138 states and 207 transitions. [2022-11-23 15:56:21,725 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 321 [2022-11-23 15:56:21,725 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 15:56:21,725 INFO L195 NwaCegarLoop]: trace histogram [25, 25, 22, 22, 18, 17, 12, 12, 12, 12, 12, 12, 12, 11, 11, 11, 11, 11, 11, 11, 8, 6, 6, 4, 1, 1, 1, 1, 1, 1] [2022-11-23 15:56:21,738 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af79cf74-59e5-490f-9e12-dca361e5b163/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Ended with exit code 0 [2022-11-23 15:56:21,932 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af79cf74-59e5-490f-9e12-dca361e5b163/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2022-11-23 15:56:21,932 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 15:56:21,933 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 15:56:21,933 INFO L85 PathProgramCache]: Analyzing trace with hash -276109964, now seen corresponding path program 4 times [2022-11-23 15:56:21,934 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 15:56:21,934 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [871470800] [2022-11-23 15:56:21,934 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:56:21,934 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 15:56:22,053 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:56:22,912 INFO L134 CoverageAnalysis]: Checked inductivity of 2897 backedges. 96 proven. 664 refuted. 0 times theorem prover too weak. 2137 trivial. 0 not checked. [2022-11-23 15:56:22,913 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 15:56:22,913 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [871470800] [2022-11-23 15:56:22,913 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [871470800] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 15:56:22,913 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1912651852] [2022-11-23 15:56:22,914 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-23 15:56:22,914 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:56:22,914 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af79cf74-59e5-490f-9e12-dca361e5b163/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 15:56:22,915 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af79cf74-59e5-490f-9e12-dca361e5b163/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 15:56:22,947 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af79cf74-59e5-490f-9e12-dca361e5b163/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-11-23 15:56:23,182 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:56:23,186 INFO L263 TraceCheckSpWp]: Trace formula consists of 736 conjuncts, 16 conjunts are in the unsatisfiable core [2022-11-23 15:56:23,193 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 15:56:23,310 INFO L134 CoverageAnalysis]: Checked inductivity of 2897 backedges. 96 proven. 664 refuted. 0 times theorem prover too weak. 2137 trivial. 0 not checked. [2022-11-23 15:56:23,310 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 15:56:26,027 INFO L134 CoverageAnalysis]: Checked inductivity of 2897 backedges. 96 proven. 688 refuted. 0 times theorem prover too weak. 2113 trivial. 0 not checked. [2022-11-23 15:56:26,027 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1912651852] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 15:56:26,028 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [103210075] [2022-11-23 15:56:26,035 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2022-11-23 15:56:26,035 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 15:56:26,036 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-23 15:56:26,037 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 15:56:26,038 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 17] total 19 [2022-11-23 15:56:26,038 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2101640115] [2022-11-23 15:56:26,039 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 15:56:26,040 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2022-11-23 15:56:26,040 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 15:56:26,041 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2022-11-23 15:56:26,041 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=275, Unknown=0, NotChecked=0, Total=342 [2022-11-23 15:56:26,041 INFO L87 Difference]: Start difference. First operand 138 states and 207 transitions. Second operand has 19 states, 18 states have (on average 3.7222222222222223) internal successors, (67), 19 states have internal predecessors, (67), 16 states have call successors, (19), 1 states have call predecessors, (19), 8 states have return successors, (23), 8 states have call predecessors, (23), 16 states have call successors, (23) [2022-11-23 15:56:26,404 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 15:56:26,404 INFO L93 Difference]: Finished difference Result 165 states and 266 transitions. [2022-11-23 15:56:26,405 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-11-23 15:56:26,405 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 18 states have (on average 3.7222222222222223) internal successors, (67), 19 states have internal predecessors, (67), 16 states have call successors, (19), 1 states have call predecessors, (19), 8 states have return successors, (23), 8 states have call predecessors, (23), 16 states have call successors, (23) Word has length 320 [2022-11-23 15:56:26,406 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 15:56:26,408 INFO L225 Difference]: With dead ends: 165 [2022-11-23 15:56:26,409 INFO L226 Difference]: Without dead ends: 151 [2022-11-23 15:56:26,410 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 662 GetRequests, 630 SyntacticMatches, 8 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 123 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=138, Invalid=512, Unknown=0, NotChecked=0, Total=650 [2022-11-23 15:56:26,410 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 104 mSDsluCounter, 85 mSDsCounter, 0 mSdLazyCounter, 221 mSolverCounterSat, 93 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 119 SdHoareTripleChecker+Valid, 101 SdHoareTripleChecker+Invalid, 314 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 93 IncrementalHoareTripleChecker+Valid, 221 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-23 15:56:26,411 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [119 Valid, 101 Invalid, 314 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [93 Valid, 221 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-23 15:56:26,415 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 151 states. [2022-11-23 15:56:26,448 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 151 to 141. [2022-11-23 15:56:26,449 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 141 states, 95 states have (on average 1.1473684210526316) internal successors, (109), 94 states have internal predecessors, (109), 26 states have call successors, (26), 15 states have call predecessors, (26), 19 states have return successors, (75), 31 states have call predecessors, (75), 26 states have call successors, (75) [2022-11-23 15:56:26,452 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 141 states to 141 states and 210 transitions. [2022-11-23 15:56:26,454 INFO L78 Accepts]: Start accepts. Automaton has 141 states and 210 transitions. Word has length 320 [2022-11-23 15:56:26,454 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 15:56:26,454 INFO L495 AbstractCegarLoop]: Abstraction has 141 states and 210 transitions. [2022-11-23 15:56:26,455 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 18 states have (on average 3.7222222222222223) internal successors, (67), 19 states have internal predecessors, (67), 16 states have call successors, (19), 1 states have call predecessors, (19), 8 states have return successors, (23), 8 states have call predecessors, (23), 16 states have call successors, (23) [2022-11-23 15:56:26,455 INFO L276 IsEmpty]: Start isEmpty. Operand 141 states and 210 transitions. [2022-11-23 15:56:26,462 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 363 [2022-11-23 15:56:26,463 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 15:56:26,463 INFO L195 NwaCegarLoop]: trace histogram [27, 27, 26, 26, 21, 20, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 8, 7, 6, 6, 1, 1, 1, 1, 1, 1] [2022-11-23 15:56:26,476 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af79cf74-59e5-490f-9e12-dca361e5b163/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2022-11-23 15:56:26,676 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af79cf74-59e5-490f-9e12-dca361e5b163/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:56:26,676 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 15:56:26,677 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 15:56:26,677 INFO L85 PathProgramCache]: Analyzing trace with hash 66016271, now seen corresponding path program 5 times [2022-11-23 15:56:26,677 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 15:56:26,677 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [391891327] [2022-11-23 15:56:26,677 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:56:26,677 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 15:56:26,799 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:56:27,490 INFO L134 CoverageAnalysis]: Checked inductivity of 3728 backedges. 174 proven. 690 refuted. 0 times theorem prover too weak. 2864 trivial. 0 not checked. [2022-11-23 15:56:27,490 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 15:56:27,491 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [391891327] [2022-11-23 15:56:27,491 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [391891327] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 15:56:27,491 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [119797964] [2022-11-23 15:56:27,491 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-23 15:56:27,491 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:56:27,492 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af79cf74-59e5-490f-9e12-dca361e5b163/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 15:56:27,493 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af79cf74-59e5-490f-9e12-dca361e5b163/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 15:56:27,506 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af79cf74-59e5-490f-9e12-dca361e5b163/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-11-23 15:56:27,728 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2022-11-23 15:56:27,729 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 15:56:27,731 INFO L263 TraceCheckSpWp]: Trace formula consists of 302 conjuncts, 12 conjunts are in the unsatisfiable core [2022-11-23 15:56:27,740 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 15:56:27,841 INFO L134 CoverageAnalysis]: Checked inductivity of 3728 backedges. 535 proven. 87 refuted. 0 times theorem prover too weak. 3106 trivial. 0 not checked. [2022-11-23 15:56:27,841 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 15:56:29,599 INFO L134 CoverageAnalysis]: Checked inductivity of 3728 backedges. 537 proven. 95 refuted. 0 times theorem prover too weak. 3096 trivial. 0 not checked. [2022-11-23 15:56:29,600 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [119797964] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 15:56:29,600 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [891147816] [2022-11-23 15:56:29,607 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2022-11-23 15:56:29,607 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 15:56:29,608 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-23 15:56:29,609 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 15:56:29,609 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 10, 13] total 18 [2022-11-23 15:56:29,610 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [960837901] [2022-11-23 15:56:29,610 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 15:56:29,611 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2022-11-23 15:56:29,611 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 15:56:29,611 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2022-11-23 15:56:29,612 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=245, Unknown=0, NotChecked=0, Total=306 [2022-11-23 15:56:29,612 INFO L87 Difference]: Start difference. First operand 141 states and 210 transitions. Second operand has 18 states, 17 states have (on average 3.8823529411764706) internal successors, (66), 18 states have internal predecessors, (66), 13 states have call successors, (21), 1 states have call predecessors, (21), 9 states have return successors, (27), 14 states have call predecessors, (27), 13 states have call successors, (27) [2022-11-23 15:56:29,931 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 15:56:29,931 INFO L93 Difference]: Finished difference Result 200 states and 352 transitions. [2022-11-23 15:56:29,932 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-11-23 15:56:29,932 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 17 states have (on average 3.8823529411764706) internal successors, (66), 18 states have internal predecessors, (66), 13 states have call successors, (21), 1 states have call predecessors, (21), 9 states have return successors, (27), 14 states have call predecessors, (27), 13 states have call successors, (27) Word has length 362 [2022-11-23 15:56:29,936 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 15:56:29,942 INFO L225 Difference]: With dead ends: 200 [2022-11-23 15:56:29,945 INFO L226 Difference]: Without dead ends: 183 [2022-11-23 15:56:29,946 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 747 GetRequests, 717 SyntacticMatches, 6 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 110 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=137, Invalid=513, Unknown=0, NotChecked=0, Total=650 [2022-11-23 15:56:29,947 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 56 mSDsluCounter, 87 mSDsCounter, 0 mSdLazyCounter, 205 mSolverCounterSat, 65 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 64 SdHoareTripleChecker+Valid, 103 SdHoareTripleChecker+Invalid, 270 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 65 IncrementalHoareTripleChecker+Valid, 205 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-23 15:56:29,947 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [64 Valid, 103 Invalid, 270 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [65 Valid, 205 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-23 15:56:29,948 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 183 states. [2022-11-23 15:56:29,983 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 183 to 157. [2022-11-23 15:56:29,984 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 157 states, 105 states have (on average 1.1333333333333333) internal successors, (119), 104 states have internal predecessors, (119), 28 states have call successors, (28), 15 states have call predecessors, (28), 23 states have return successors, (101), 37 states have call predecessors, (101), 28 states have call successors, (101) [2022-11-23 15:56:29,989 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 157 states to 157 states and 248 transitions. [2022-11-23 15:56:29,991 INFO L78 Accepts]: Start accepts. Automaton has 157 states and 248 transitions. Word has length 362 [2022-11-23 15:56:29,992 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 15:56:29,993 INFO L495 AbstractCegarLoop]: Abstraction has 157 states and 248 transitions. [2022-11-23 15:56:29,993 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 17 states have (on average 3.8823529411764706) internal successors, (66), 18 states have internal predecessors, (66), 13 states have call successors, (21), 1 states have call predecessors, (21), 9 states have return successors, (27), 14 states have call predecessors, (27), 13 states have call successors, (27) [2022-11-23 15:56:29,993 INFO L276 IsEmpty]: Start isEmpty. Operand 157 states and 248 transitions. [2022-11-23 15:56:30,002 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 365 [2022-11-23 15:56:30,003 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 15:56:30,003 INFO L195 NwaCegarLoop]: trace histogram [27, 27, 26, 26, 22, 21, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 9, 8, 5, 5, 1, 1, 1, 1, 1, 1] [2022-11-23 15:56:30,010 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af79cf74-59e5-490f-9e12-dca361e5b163/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2022-11-23 15:56:30,210 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af79cf74-59e5-490f-9e12-dca361e5b163/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:56:30,210 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 15:56:30,210 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 15:56:30,210 INFO L85 PathProgramCache]: Analyzing trace with hash 1791021909, now seen corresponding path program 6 times [2022-11-23 15:56:30,210 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 15:56:30,211 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1804240806] [2022-11-23 15:56:30,211 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:56:30,211 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 15:56:30,272 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:56:30,783 INFO L134 CoverageAnalysis]: Checked inductivity of 3769 backedges. 203 proven. 563 refuted. 0 times theorem prover too weak. 3003 trivial. 0 not checked. [2022-11-23 15:56:30,783 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 15:56:30,783 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1804240806] [2022-11-23 15:56:30,784 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1804240806] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 15:56:30,784 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1342694010] [2022-11-23 15:56:30,784 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-23 15:56:30,784 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:56:30,785 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af79cf74-59e5-490f-9e12-dca361e5b163/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 15:56:30,786 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af79cf74-59e5-490f-9e12-dca361e5b163/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 15:56:30,819 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af79cf74-59e5-490f-9e12-dca361e5b163/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-11-23 15:56:31,075 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-23 15:56:31,075 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 15:56:31,078 INFO L263 TraceCheckSpWp]: Trace formula consists of 647 conjuncts, 14 conjunts are in the unsatisfiable core [2022-11-23 15:56:31,085 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 15:56:31,270 INFO L134 CoverageAnalysis]: Checked inductivity of 3769 backedges. 1594 proven. 68 refuted. 0 times theorem prover too weak. 2107 trivial. 0 not checked. [2022-11-23 15:56:31,271 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 15:56:33,834 INFO L134 CoverageAnalysis]: Checked inductivity of 3769 backedges. 240 proven. 780 refuted. 0 times theorem prover too weak. 2749 trivial. 0 not checked. [2022-11-23 15:56:33,835 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1342694010] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 15:56:33,835 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1379178992] [2022-11-23 15:56:33,837 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2022-11-23 15:56:33,837 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 15:56:33,838 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-23 15:56:33,840 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 15:56:33,840 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 13, 15] total 24 [2022-11-23 15:56:33,842 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [42557988] [2022-11-23 15:56:33,842 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 15:56:33,845 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2022-11-23 15:56:33,845 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 15:56:33,846 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2022-11-23 15:56:33,847 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=484, Unknown=0, NotChecked=0, Total=552 [2022-11-23 15:56:33,847 INFO L87 Difference]: Start difference. First operand 157 states and 248 transitions. Second operand has 24 states, 23 states have (on average 4.173913043478261) internal successors, (96), 24 states have internal predecessors, (96), 19 states have call successors, (29), 2 states have call predecessors, (29), 12 states have return successors, (36), 12 states have call predecessors, (36), 19 states have call successors, (36) [2022-11-23 15:56:34,987 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 15:56:34,987 INFO L93 Difference]: Finished difference Result 358 states and 672 transitions. [2022-11-23 15:56:34,988 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2022-11-23 15:56:34,988 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 23 states have (on average 4.173913043478261) internal successors, (96), 24 states have internal predecessors, (96), 19 states have call successors, (29), 2 states have call predecessors, (29), 12 states have return successors, (36), 12 states have call predecessors, (36), 19 states have call successors, (36) Word has length 364 [2022-11-23 15:56:34,989 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 15:56:34,992 INFO L225 Difference]: With dead ends: 358 [2022-11-23 15:56:34,993 INFO L226 Difference]: Without dead ends: 215 [2022-11-23 15:56:34,995 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 765 GetRequests, 712 SyntacticMatches, 7 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 429 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=359, Invalid=1897, Unknown=0, NotChecked=0, Total=2256 [2022-11-23 15:56:34,996 INFO L413 NwaCegarLoop]: 31 mSDtfsCounter, 152 mSDsluCounter, 181 mSDsCounter, 0 mSdLazyCounter, 801 mSolverCounterSat, 223 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 153 SdHoareTripleChecker+Valid, 212 SdHoareTripleChecker+Invalid, 1024 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 223 IncrementalHoareTripleChecker+Valid, 801 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-11-23 15:56:34,997 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [153 Valid, 212 Invalid, 1024 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [223 Valid, 801 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-11-23 15:56:34,998 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 215 states. [2022-11-23 15:56:35,020 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 215 to 196. [2022-11-23 15:56:35,021 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 196 states, 133 states have (on average 1.1428571428571428) internal successors, (152), 131 states have internal predecessors, (152), 36 states have call successors, (36), 22 states have call predecessors, (36), 26 states have return successors, (159), 42 states have call predecessors, (159), 36 states have call successors, (159) [2022-11-23 15:56:35,024 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 196 states to 196 states and 347 transitions. [2022-11-23 15:56:35,024 INFO L78 Accepts]: Start accepts. Automaton has 196 states and 347 transitions. Word has length 364 [2022-11-23 15:56:35,025 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 15:56:35,025 INFO L495 AbstractCegarLoop]: Abstraction has 196 states and 347 transitions. [2022-11-23 15:56:35,025 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 23 states have (on average 4.173913043478261) internal successors, (96), 24 states have internal predecessors, (96), 19 states have call successors, (29), 2 states have call predecessors, (29), 12 states have return successors, (36), 12 states have call predecessors, (36), 19 states have call successors, (36) [2022-11-23 15:56:35,026 INFO L276 IsEmpty]: Start isEmpty. Operand 196 states and 347 transitions. [2022-11-23 15:56:35,030 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 356 [2022-11-23 15:56:35,030 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 15:56:35,030 INFO L195 NwaCegarLoop]: trace histogram [27, 27, 26, 24, 24, 20, 14, 13, 13, 13, 13, 13, 13, 13, 12, 12, 12, 12, 12, 12, 12, 7, 4, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 15:56:35,043 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af79cf74-59e5-490f-9e12-dca361e5b163/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2022-11-23 15:56:35,237 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af79cf74-59e5-490f-9e12-dca361e5b163/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2022-11-23 15:56:35,238 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 15:56:35,238 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 15:56:35,238 INFO L85 PathProgramCache]: Analyzing trace with hash -991542288, now seen corresponding path program 7 times [2022-11-23 15:56:35,238 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 15:56:35,239 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [440592190] [2022-11-23 15:56:35,239 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:56:35,239 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 15:56:35,339 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:56:35,913 INFO L134 CoverageAnalysis]: Checked inductivity of 3599 backedges. 248 proven. 497 refuted. 0 times theorem prover too weak. 2854 trivial. 0 not checked. [2022-11-23 15:56:35,913 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 15:56:35,913 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [440592190] [2022-11-23 15:56:35,913 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [440592190] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 15:56:35,914 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [267688917] [2022-11-23 15:56:35,914 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-23 15:56:35,914 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:56:35,914 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af79cf74-59e5-490f-9e12-dca361e5b163/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 15:56:35,915 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af79cf74-59e5-490f-9e12-dca361e5b163/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 15:56:35,918 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af79cf74-59e5-490f-9e12-dca361e5b163/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2022-11-23 15:56:36,221 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:56:36,225 INFO L263 TraceCheckSpWp]: Trace formula consists of 812 conjuncts, 16 conjunts are in the unsatisfiable core [2022-11-23 15:56:36,233 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 15:56:36,509 INFO L134 CoverageAnalysis]: Checked inductivity of 3599 backedges. 201 proven. 670 refuted. 0 times theorem prover too weak. 2728 trivial. 0 not checked. [2022-11-23 15:56:36,509 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 15:56:39,209 INFO L134 CoverageAnalysis]: Checked inductivity of 3599 backedges. 209 proven. 683 refuted. 0 times theorem prover too weak. 2707 trivial. 0 not checked. [2022-11-23 15:56:39,209 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [267688917] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 15:56:39,209 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [297536238] [2022-11-23 15:56:39,213 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2022-11-23 15:56:39,213 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 15:56:39,213 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-23 15:56:39,215 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 15:56:39,215 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 12, 17] total 28 [2022-11-23 15:56:39,215 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1221413211] [2022-11-23 15:56:39,215 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 15:56:39,216 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2022-11-23 15:56:39,217 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 15:56:39,217 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2022-11-23 15:56:39,218 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=91, Invalid=665, Unknown=0, NotChecked=0, Total=756 [2022-11-23 15:56:39,218 INFO L87 Difference]: Start difference. First operand 196 states and 347 transitions. Second operand has 28 states, 26 states have (on average 3.576923076923077) internal successors, (93), 28 states have internal predecessors, (93), 21 states have call successors, (29), 1 states have call predecessors, (29), 14 states have return successors, (36), 18 states have call predecessors, (36), 21 states have call successors, (36) [2022-11-23 15:56:40,935 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 15:56:40,935 INFO L93 Difference]: Finished difference Result 632 states and 1655 transitions. [2022-11-23 15:56:40,936 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2022-11-23 15:56:40,936 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 26 states have (on average 3.576923076923077) internal successors, (93), 28 states have internal predecessors, (93), 21 states have call successors, (29), 1 states have call predecessors, (29), 14 states have return successors, (36), 18 states have call predecessors, (36), 21 states have call successors, (36) Word has length 355 [2022-11-23 15:56:40,937 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 15:56:40,948 INFO L225 Difference]: With dead ends: 632 [2022-11-23 15:56:40,948 INFO L226 Difference]: Without dead ends: 350 [2022-11-23 15:56:40,955 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 750 GetRequests, 689 SyntacticMatches, 8 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 646 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=417, Invalid=2553, Unknown=0, NotChecked=0, Total=2970 [2022-11-23 15:56:40,956 INFO L413 NwaCegarLoop]: 40 mSDtfsCounter, 225 mSDsluCounter, 300 mSDsCounter, 0 mSdLazyCounter, 1215 mSolverCounterSat, 370 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 225 SdHoareTripleChecker+Valid, 340 SdHoareTripleChecker+Invalid, 1585 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 370 IncrementalHoareTripleChecker+Valid, 1215 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2022-11-23 15:56:40,956 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [225 Valid, 340 Invalid, 1585 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [370 Valid, 1215 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2022-11-23 15:56:40,957 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 350 states. [2022-11-23 15:56:40,999 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 350 to 271. [2022-11-23 15:56:41,000 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 271 states, 186 states have (on average 1.1236559139784945) internal successors, (209), 178 states have internal predecessors, (209), 53 states have call successors, (53), 35 states have call predecessors, (53), 31 states have return successors, (255), 57 states have call predecessors, (255), 53 states have call successors, (255) [2022-11-23 15:56:41,007 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 271 states to 271 states and 517 transitions. [2022-11-23 15:56:41,008 INFO L78 Accepts]: Start accepts. Automaton has 271 states and 517 transitions. Word has length 355 [2022-11-23 15:56:41,008 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 15:56:41,008 INFO L495 AbstractCegarLoop]: Abstraction has 271 states and 517 transitions. [2022-11-23 15:56:41,009 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 26 states have (on average 3.576923076923077) internal successors, (93), 28 states have internal predecessors, (93), 21 states have call successors, (29), 1 states have call predecessors, (29), 14 states have return successors, (36), 18 states have call predecessors, (36), 21 states have call successors, (36) [2022-11-23 15:56:41,009 INFO L276 IsEmpty]: Start isEmpty. Operand 271 states and 517 transitions. [2022-11-23 15:56:41,016 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 600 [2022-11-23 15:56:41,017 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 15:56:41,017 INFO L195 NwaCegarLoop]: trace histogram [47, 47, 40, 40, 39, 35, 23, 23, 23, 23, 23, 23, 23, 20, 20, 20, 20, 20, 20, 20, 19, 12, 8, 5, 1, 1, 1, 1, 1, 1] [2022-11-23 15:56:41,030 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af79cf74-59e5-490f-9e12-dca361e5b163/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2022-11-23 15:56:41,224 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af79cf74-59e5-490f-9e12-dca361e5b163/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2022-11-23 15:56:41,225 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 15:56:41,225 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 15:56:41,226 INFO L85 PathProgramCache]: Analyzing trace with hash 796761476, now seen corresponding path program 8 times [2022-11-23 15:56:41,226 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 15:56:41,226 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [588377735] [2022-11-23 15:56:41,226 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:56:41,226 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 15:56:41,333 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:56:41,974 INFO L134 CoverageAnalysis]: Checked inductivity of 10552 backedges. 741 proven. 134 refuted. 0 times theorem prover too weak. 9677 trivial. 0 not checked. [2022-11-23 15:56:41,975 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 15:56:41,975 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [588377735] [2022-11-23 15:56:41,975 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [588377735] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 15:56:41,976 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [948759842] [2022-11-23 15:56:41,976 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-23 15:56:41,976 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:56:41,976 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af79cf74-59e5-490f-9e12-dca361e5b163/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 15:56:41,978 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af79cf74-59e5-490f-9e12-dca361e5b163/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 15:56:41,983 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af79cf74-59e5-490f-9e12-dca361e5b163/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2022-11-23 15:56:42,263 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-11-23 15:56:42,263 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 15:56:42,265 INFO L263 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 6 conjunts are in the unsatisfiable core [2022-11-23 15:56:42,276 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 15:56:42,362 INFO L134 CoverageAnalysis]: Checked inductivity of 10552 backedges. 1010 proven. 4 refuted. 0 times theorem prover too weak. 9538 trivial. 0 not checked. [2022-11-23 15:56:42,362 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 15:56:44,192 INFO L134 CoverageAnalysis]: Checked inductivity of 10552 backedges. 826 proven. 6 refuted. 0 times theorem prover too weak. 9720 trivial. 0 not checked. [2022-11-23 15:56:44,192 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [948759842] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 15:56:44,193 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1237362] [2022-11-23 15:56:44,197 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2022-11-23 15:56:44,197 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 15:56:44,199 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-23 15:56:44,200 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 15:56:44,201 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 7, 7] total 15 [2022-11-23 15:56:44,202 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1553479724] [2022-11-23 15:56:44,202 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 15:56:44,205 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2022-11-23 15:56:44,206 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 15:56:44,206 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2022-11-23 15:56:44,206 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=175, Unknown=0, NotChecked=0, Total=210 [2022-11-23 15:56:44,207 INFO L87 Difference]: Start difference. First operand 271 states and 517 transitions. Second operand has 15 states, 14 states have (on average 4.071428571428571) internal successors, (57), 15 states have internal predecessors, (57), 6 states have call successors, (13), 2 states have call predecessors, (13), 8 states have return successors, (18), 8 states have call predecessors, (18), 6 states have call successors, (18) [2022-11-23 15:56:44,674 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 15:56:44,674 INFO L93 Difference]: Finished difference Result 571 states and 1280 transitions. [2022-11-23 15:56:44,675 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2022-11-23 15:56:44,676 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 14 states have (on average 4.071428571428571) internal successors, (57), 15 states have internal predecessors, (57), 6 states have call successors, (13), 2 states have call predecessors, (13), 8 states have return successors, (18), 8 states have call predecessors, (18), 6 states have call successors, (18) Word has length 599 [2022-11-23 15:56:44,676 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 15:56:44,686 INFO L225 Difference]: With dead ends: 571 [2022-11-23 15:56:44,686 INFO L226 Difference]: Without dead ends: 313 [2022-11-23 15:56:44,694 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1216 GetRequests, 1191 SyntacticMatches, 3 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=114, Invalid=438, Unknown=0, NotChecked=0, Total=552 [2022-11-23 15:56:44,695 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 72 mSDsluCounter, 79 mSDsCounter, 0 mSdLazyCounter, 281 mSolverCounterSat, 65 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 76 SdHoareTripleChecker+Valid, 95 SdHoareTripleChecker+Invalid, 346 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 65 IncrementalHoareTripleChecker+Valid, 281 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-23 15:56:44,696 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [76 Valid, 95 Invalid, 346 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [65 Valid, 281 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-23 15:56:44,697 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 313 states. [2022-11-23 15:56:44,744 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 313 to 297. [2022-11-23 15:56:44,745 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 297 states, 204 states have (on average 1.1225490196078431) internal successors, (229), 195 states have internal predecessors, (229), 61 states have call successors, (61), 40 states have call predecessors, (61), 31 states have return successors, (284), 61 states have call predecessors, (284), 61 states have call successors, (284) [2022-11-23 15:56:44,751 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 297 states to 297 states and 574 transitions. [2022-11-23 15:56:44,752 INFO L78 Accepts]: Start accepts. Automaton has 297 states and 574 transitions. Word has length 599 [2022-11-23 15:56:44,752 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 15:56:44,753 INFO L495 AbstractCegarLoop]: Abstraction has 297 states and 574 transitions. [2022-11-23 15:56:44,753 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 14 states have (on average 4.071428571428571) internal successors, (57), 15 states have internal predecessors, (57), 6 states have call successors, (13), 2 states have call predecessors, (13), 8 states have return successors, (18), 8 states have call predecessors, (18), 6 states have call successors, (18) [2022-11-23 15:56:44,753 INFO L276 IsEmpty]: Start isEmpty. Operand 297 states and 574 transitions. [2022-11-23 15:56:44,765 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 610 [2022-11-23 15:56:44,765 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 15:56:44,766 INFO L195 NwaCegarLoop]: trace histogram [47, 47, 42, 42, 37, 35, 23, 23, 23, 23, 23, 23, 23, 21, 21, 21, 21, 21, 21, 21, 16, 12, 10, 7, 1, 1, 1, 1, 1, 1] [2022-11-23 15:56:44,777 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af79cf74-59e5-490f-9e12-dca361e5b163/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2022-11-23 15:56:44,972 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14,14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af79cf74-59e5-490f-9e12-dca361e5b163/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:56:44,973 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 15:56:44,973 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 15:56:44,973 INFO L85 PathProgramCache]: Analyzing trace with hash 481086363, now seen corresponding path program 9 times [2022-11-23 15:56:44,974 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 15:56:44,974 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1987391840] [2022-11-23 15:56:44,974 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:56:44,974 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 15:56:45,111 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:56:46,170 INFO L134 CoverageAnalysis]: Checked inductivity of 10881 backedges. 431 proven. 1004 refuted. 0 times theorem prover too weak. 9446 trivial. 0 not checked. [2022-11-23 15:56:46,171 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 15:56:46,171 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1987391840] [2022-11-23 15:56:46,171 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1987391840] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 15:56:46,171 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1849339369] [2022-11-23 15:56:46,172 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-23 15:56:46,172 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:56:46,172 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af79cf74-59e5-490f-9e12-dca361e5b163/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 15:56:46,176 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af79cf74-59e5-490f-9e12-dca361e5b163/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 15:56:46,210 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af79cf74-59e5-490f-9e12-dca361e5b163/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2022-11-23 15:56:46,573 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-23 15:56:46,573 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 15:56:46,577 INFO L263 TraceCheckSpWp]: Trace formula consists of 1083 conjuncts, 22 conjunts are in the unsatisfiable core [2022-11-23 15:56:46,588 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 15:56:46,938 INFO L134 CoverageAnalysis]: Checked inductivity of 10881 backedges. 5323 proven. 409 refuted. 0 times theorem prover too weak. 5149 trivial. 0 not checked. [2022-11-23 15:56:46,939 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 15:56:51,678 INFO L134 CoverageAnalysis]: Checked inductivity of 10881 backedges. 464 proven. 2094 refuted. 0 times theorem prover too weak. 8323 trivial. 0 not checked. [2022-11-23 15:56:51,678 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1849339369] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 15:56:51,678 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1557030838] [2022-11-23 15:56:51,680 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2022-11-23 15:56:51,680 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 15:56:51,680 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-23 15:56:51,681 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 15:56:51,682 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 17, 23] total 35 [2022-11-23 15:56:51,682 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1633088386] [2022-11-23 15:56:51,682 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 15:56:51,683 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2022-11-23 15:56:51,684 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 15:56:51,684 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2022-11-23 15:56:51,684 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=1052, Unknown=0, NotChecked=0, Total=1190 [2022-11-23 15:56:51,685 INFO L87 Difference]: Start difference. First operand 297 states and 574 transitions. Second operand has 35 states, 34 states have (on average 3.6176470588235294) internal successors, (123), 35 states have internal predecessors, (123), 27 states have call successors, (38), 2 states have call predecessors, (38), 16 states have return successors, (49), 17 states have call predecessors, (49), 27 states have call successors, (49) [2022-11-23 15:56:53,886 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 15:56:53,886 INFO L93 Difference]: Finished difference Result 615 states and 1227 transitions. [2022-11-23 15:56:53,886 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2022-11-23 15:56:53,887 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 34 states have (on average 3.6176470588235294) internal successors, (123), 35 states have internal predecessors, (123), 27 states have call successors, (38), 2 states have call predecessors, (38), 16 states have return successors, (49), 17 states have call predecessors, (49), 27 states have call successors, (49) Word has length 609 [2022-11-23 15:56:53,888 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 15:56:53,894 INFO L225 Difference]: With dead ends: 615 [2022-11-23 15:56:53,894 INFO L226 Difference]: Without dead ends: 316 [2022-11-23 15:56:53,900 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1263 GetRequests, 1189 SyntacticMatches, 11 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1066 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=621, Invalid=3539, Unknown=0, NotChecked=0, Total=4160 [2022-11-23 15:56:53,901 INFO L413 NwaCegarLoop]: 50 mSDtfsCounter, 181 mSDsluCounter, 431 mSDsCounter, 0 mSdLazyCounter, 1696 mSolverCounterSat, 308 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 182 SdHoareTripleChecker+Valid, 481 SdHoareTripleChecker+Invalid, 2004 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 308 IncrementalHoareTripleChecker+Valid, 1696 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2022-11-23 15:56:53,901 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [182 Valid, 481 Invalid, 2004 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [308 Valid, 1696 Invalid, 0 Unknown, 0 Unchecked, 1.4s Time] [2022-11-23 15:56:53,902 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 316 states. [2022-11-23 15:56:53,935 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 316 to 271. [2022-11-23 15:56:53,936 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 271 states, 190 states have (on average 1.105263157894737) internal successors, (210), 178 states have internal predecessors, (210), 52 states have call successors, (52), 39 states have call predecessors, (52), 28 states have return successors, (171), 53 states have call predecessors, (171), 52 states have call successors, (171) [2022-11-23 15:56:53,939 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 271 states to 271 states and 433 transitions. [2022-11-23 15:56:53,940 INFO L78 Accepts]: Start accepts. Automaton has 271 states and 433 transitions. Word has length 609 [2022-11-23 15:56:53,941 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 15:56:53,941 INFO L495 AbstractCegarLoop]: Abstraction has 271 states and 433 transitions. [2022-11-23 15:56:53,941 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 34 states have (on average 3.6176470588235294) internal successors, (123), 35 states have internal predecessors, (123), 27 states have call successors, (38), 2 states have call predecessors, (38), 16 states have return successors, (49), 17 states have call predecessors, (49), 27 states have call successors, (49) [2022-11-23 15:56:53,941 INFO L276 IsEmpty]: Start isEmpty. Operand 271 states and 433 transitions. [2022-11-23 15:56:53,949 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 648 [2022-11-23 15:56:53,949 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 15:56:53,949 INFO L195 NwaCegarLoop]: trace histogram [49, 49, 46, 46, 38, 36, 24, 24, 24, 24, 24, 24, 24, 23, 23, 23, 23, 23, 23, 23, 14, 13, 13, 8, 1, 1, 1, 1, 1, 1] [2022-11-23 15:56:53,967 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af79cf74-59e5-490f-9e12-dca361e5b163/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2022-11-23 15:56:54,157 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af79cf74-59e5-490f-9e12-dca361e5b163/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2022-11-23 15:56:54,157 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 15:56:54,157 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 15:56:54,157 INFO L85 PathProgramCache]: Analyzing trace with hash -92919396, now seen corresponding path program 10 times [2022-11-23 15:56:54,158 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 15:56:54,158 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [424892182] [2022-11-23 15:56:54,158 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:56:54,158 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 15:56:54,284 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:56:55,273 INFO L134 CoverageAnalysis]: Checked inductivity of 12293 backedges. 566 proven. 967 refuted. 0 times theorem prover too weak. 10760 trivial. 0 not checked. [2022-11-23 15:56:55,273 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 15:56:55,274 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [424892182] [2022-11-23 15:56:55,274 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [424892182] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 15:56:55,274 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [783350545] [2022-11-23 15:56:55,274 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-23 15:56:55,274 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:56:55,275 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af79cf74-59e5-490f-9e12-dca361e5b163/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 15:56:55,276 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af79cf74-59e5-490f-9e12-dca361e5b163/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 15:56:55,299 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af79cf74-59e5-490f-9e12-dca361e5b163/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2022-11-23 15:56:55,682 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:56:55,688 INFO L263 TraceCheckSpWp]: Trace formula consists of 1462 conjuncts, 18 conjunts are in the unsatisfiable core [2022-11-23 15:56:55,697 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 15:56:55,819 INFO L134 CoverageAnalysis]: Checked inductivity of 12293 backedges. 676 proven. 1242 refuted. 0 times theorem prover too weak. 10375 trivial. 0 not checked. [2022-11-23 15:56:55,820 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 15:56:59,133 INFO L134 CoverageAnalysis]: Checked inductivity of 12293 backedges. 676 proven. 1272 refuted. 0 times theorem prover too weak. 10345 trivial. 0 not checked. [2022-11-23 15:56:59,133 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [783350545] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 15:56:59,134 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1763193475] [2022-11-23 15:56:59,135 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2022-11-23 15:56:59,135 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 15:56:59,136 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-23 15:56:59,137 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 15:56:59,137 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13, 19] total 25 [2022-11-23 15:56:59,137 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1964602938] [2022-11-23 15:56:59,138 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 15:56:59,139 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2022-11-23 15:56:59,139 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 15:56:59,139 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2022-11-23 15:56:59,139 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=109, Invalid=491, Unknown=0, NotChecked=0, Total=600 [2022-11-23 15:56:59,140 INFO L87 Difference]: Start difference. First operand 271 states and 433 transitions. Second operand has 25 states, 24 states have (on average 3.375) internal successors, (81), 25 states have internal predecessors, (81), 18 states have call successors, (25), 1 states have call predecessors, (25), 10 states have return successors, (31), 14 states have call predecessors, (31), 18 states have call successors, (31) [2022-11-23 15:56:59,578 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 15:56:59,579 INFO L93 Difference]: Finished difference Result 320 states and 551 transitions. [2022-11-23 15:56:59,579 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-11-23 15:56:59,579 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 24 states have (on average 3.375) internal successors, (81), 25 states have internal predecessors, (81), 18 states have call successors, (25), 1 states have call predecessors, (25), 10 states have return successors, (31), 14 states have call predecessors, (31), 18 states have call successors, (31) Word has length 647 [2022-11-23 15:56:59,581 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 15:56:59,585 INFO L225 Difference]: With dead ends: 320 [2022-11-23 15:56:59,585 INFO L226 Difference]: Without dead ends: 269 [2022-11-23 15:56:59,587 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1317 GetRequests, 1277 SyntacticMatches, 9 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 350 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=212, Invalid=844, Unknown=0, NotChecked=0, Total=1056 [2022-11-23 15:56:59,588 INFO L413 NwaCegarLoop]: 43 mSDtfsCounter, 41 mSDsluCounter, 267 mSDsCounter, 0 mSdLazyCounter, 496 mSolverCounterSat, 38 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 43 SdHoareTripleChecker+Valid, 310 SdHoareTripleChecker+Invalid, 534 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 38 IncrementalHoareTripleChecker+Valid, 496 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-23 15:56:59,588 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [43 Valid, 310 Invalid, 534 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [38 Valid, 496 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-23 15:56:59,589 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 269 states. [2022-11-23 15:56:59,609 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 269 to 223. [2022-11-23 15:56:59,610 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 223 states, 156 states have (on average 1.1025641025641026) internal successors, (172), 147 states have internal predecessors, (172), 41 states have call successors, (41), 31 states have call predecessors, (41), 25 states have return successors, (96), 44 states have call predecessors, (96), 41 states have call successors, (96) [2022-11-23 15:56:59,612 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 223 states to 223 states and 309 transitions. [2022-11-23 15:56:59,613 INFO L78 Accepts]: Start accepts. Automaton has 223 states and 309 transitions. Word has length 647 [2022-11-23 15:56:59,613 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 15:56:59,613 INFO L495 AbstractCegarLoop]: Abstraction has 223 states and 309 transitions. [2022-11-23 15:56:59,614 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 24 states have (on average 3.375) internal successors, (81), 25 states have internal predecessors, (81), 18 states have call successors, (25), 1 states have call predecessors, (25), 10 states have return successors, (31), 14 states have call predecessors, (31), 18 states have call successors, (31) [2022-11-23 15:56:59,614 INFO L276 IsEmpty]: Start isEmpty. Operand 223 states and 309 transitions. [2022-11-23 15:56:59,618 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 568 [2022-11-23 15:56:59,618 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 15:56:59,619 INFO L195 NwaCegarLoop]: trace histogram [42, 42, 41, 41, 34, 32, 21, 21, 21, 21, 21, 21, 21, 20, 20, 20, 20, 20, 20, 20, 14, 11, 9, 8, 1, 1, 1, 1, 1, 1] [2022-11-23 15:56:59,627 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af79cf74-59e5-490f-9e12-dca361e5b163/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2022-11-23 15:56:59,827 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af79cf74-59e5-490f-9e12-dca361e5b163/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2022-11-23 15:56:59,827 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 15:56:59,827 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 15:56:59,827 INFO L85 PathProgramCache]: Analyzing trace with hash 184290042, now seen corresponding path program 11 times [2022-11-23 15:56:59,827 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 15:56:59,828 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [710521322] [2022-11-23 15:56:59,828 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:56:59,828 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 15:56:59,919 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:57:00,595 INFO L134 CoverageAnalysis]: Checked inductivity of 9381 backedges. 849 proven. 478 refuted. 0 times theorem prover too weak. 8054 trivial. 0 not checked. [2022-11-23 15:57:00,595 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 15:57:00,595 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [710521322] [2022-11-23 15:57:00,596 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [710521322] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 15:57:00,596 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1160640218] [2022-11-23 15:57:00,596 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-23 15:57:00,596 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:57:00,596 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af79cf74-59e5-490f-9e12-dca361e5b163/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 15:57:00,600 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af79cf74-59e5-490f-9e12-dca361e5b163/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 15:57:00,620 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af79cf74-59e5-490f-9e12-dca361e5b163/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2022-11-23 15:57:00,976 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2022-11-23 15:57:00,976 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 15:57:00,979 INFO L263 TraceCheckSpWp]: Trace formula consists of 648 conjuncts, 8 conjunts are in the unsatisfiable core [2022-11-23 15:57:00,986 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 15:57:01,077 INFO L134 CoverageAnalysis]: Checked inductivity of 9381 backedges. 4964 proven. 6 refuted. 0 times theorem prover too weak. 4411 trivial. 0 not checked. [2022-11-23 15:57:01,078 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 15:57:02,725 INFO L134 CoverageAnalysis]: Checked inductivity of 9381 backedges. 844 proven. 384 refuted. 0 times theorem prover too weak. 8153 trivial. 0 not checked. [2022-11-23 15:57:02,725 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1160640218] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 15:57:02,726 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [166328998] [2022-11-23 15:57:02,727 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2022-11-23 15:57:02,727 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 15:57:02,728 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:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-23 15:57:02,729 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 15:57:02,729 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 9, 9] total 22 [2022-11-23 15:57:02,729 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2098732425] [2022-11-23 15:57:02,729 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 15:57:02,730 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2022-11-23 15:57:02,731 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 15:57:02,731 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2022-11-23 15:57:02,731 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=73, Invalid=389, Unknown=0, NotChecked=0, Total=462 [2022-11-23 15:57:02,732 INFO L87 Difference]: Start difference. First operand 223 states and 309 transitions. Second operand has 22 states, 21 states have (on average 3.8095238095238093) internal successors, (80), 22 states have internal predecessors, (80), 12 states have call successors, (23), 2 states have call predecessors, (23), 11 states have return successors, (31), 12 states have call predecessors, (31), 12 states have call successors, (31) [2022-11-23 15:57:03,140 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 15:57:03,140 INFO L93 Difference]: Finished difference Result 425 states and 617 transitions. [2022-11-23 15:57:03,140 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2022-11-23 15:57:03,141 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 21 states have (on average 3.8095238095238093) internal successors, (80), 22 states have internal predecessors, (80), 12 states have call successors, (23), 2 states have call predecessors, (23), 11 states have return successors, (31), 12 states have call predecessors, (31), 12 states have call successors, (31) Word has length 567 [2022-11-23 15:57:03,141 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 15:57:03,143 INFO L225 Difference]: With dead ends: 425 [2022-11-23 15:57:03,144 INFO L226 Difference]: Without dead ends: 211 [2022-11-23 15:57:03,145 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1159 GetRequests, 1125 SyntacticMatches, 4 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 226 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=178, Invalid=814, Unknown=0, NotChecked=0, Total=992 [2022-11-23 15:57:03,146 INFO L413 NwaCegarLoop]: 42 mSDtfsCounter, 56 mSDsluCounter, 174 mSDsCounter, 0 mSdLazyCounter, 319 mSolverCounterSat, 47 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 58 SdHoareTripleChecker+Valid, 216 SdHoareTripleChecker+Invalid, 366 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 47 IncrementalHoareTripleChecker+Valid, 319 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-23 15:57:03,146 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [58 Valid, 216 Invalid, 366 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [47 Valid, 319 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-23 15:57:03,147 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 211 states. [2022-11-23 15:57:03,163 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 211 to 202. [2022-11-23 15:57:03,164 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 202 states, 143 states have (on average 1.1118881118881119) internal successors, (159), 134 states have internal predecessors, (159), 38 states have call successors, (38), 31 states have call predecessors, (38), 20 states have return successors, (70), 36 states have call predecessors, (70), 38 states have call successors, (70) [2022-11-23 15:57:03,166 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 202 states to 202 states and 267 transitions. [2022-11-23 15:57:03,166 INFO L78 Accepts]: Start accepts. Automaton has 202 states and 267 transitions. Word has length 567 [2022-11-23 15:57:03,167 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 15:57:03,167 INFO L495 AbstractCegarLoop]: Abstraction has 202 states and 267 transitions. [2022-11-23 15:57:03,167 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 21 states have (on average 3.8095238095238093) internal successors, (80), 22 states have internal predecessors, (80), 12 states have call successors, (23), 2 states have call predecessors, (23), 11 states have return successors, (31), 12 states have call predecessors, (31), 12 states have call successors, (31) [2022-11-23 15:57:03,167 INFO L276 IsEmpty]: Start isEmpty. Operand 202 states and 267 transitions. [2022-11-23 15:57:03,171 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 460 [2022-11-23 15:57:03,171 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 15:57:03,171 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] [2022-11-23 15:57:03,183 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af79cf74-59e5-490f-9e12-dca361e5b163/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2022-11-23 15:57:03,378 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af79cf74-59e5-490f-9e12-dca361e5b163/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2022-11-23 15:57:03,378 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 15:57:03,379 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 15:57:03,379 INFO L85 PathProgramCache]: Analyzing trace with hash -1780384136, now seen corresponding path program 12 times [2022-11-23 15:57:03,379 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 15:57:03,379 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [438281525] [2022-11-23 15:57:03,379 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:57:03,379 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 15:57:03,461 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:57:09,136 INFO L134 CoverageAnalysis]: Checked inductivity of 6082 backedges. 0 proven. 2033 refuted. 0 times theorem prover too weak. 4049 trivial. 0 not checked. [2022-11-23 15:57:09,136 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 15:57:09,137 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [438281525] [2022-11-23 15:57:09,137 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [438281525] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 15:57:09,137 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [891112290] [2022-11-23 15:57:09,137 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-23 15:57:09,137 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:57:09,137 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af79cf74-59e5-490f-9e12-dca361e5b163/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 15:57:09,144 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af79cf74-59e5-490f-9e12-dca361e5b163/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 15:57:09,171 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af79cf74-59e5-490f-9e12-dca361e5b163/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2022-11-23 15:57:09,516 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-23 15:57:09,516 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 15:57:09,526 INFO L263 TraceCheckSpWp]: Trace formula consists of 1044 conjuncts, 271 conjunts are in the unsatisfiable core [2022-11-23 15:57:09,534 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 15:57:10,954 INFO L134 CoverageAnalysis]: Checked inductivity of 6082 backedges. 0 proven. 2033 refuted. 0 times theorem prover too weak. 4049 trivial. 0 not checked. [2022-11-23 15:57:10,954 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 15:57:15,391 INFO L134 CoverageAnalysis]: Checked inductivity of 6082 backedges. 0 proven. 2033 refuted. 0 times theorem prover too weak. 4049 trivial. 0 not checked. [2022-11-23 15:57:15,391 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [891112290] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 15:57:15,391 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [751098202] [2022-11-23 15:57:15,392 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2022-11-23 15:57:15,392 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 15:57:15,393 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-23 15:57:15,393 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 15:57:15,394 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 40, 40] total 52 [2022-11-23 15:57:15,394 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1130399236] [2022-11-23 15:57:15,394 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 15:57:15,395 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 52 states [2022-11-23 15:57:15,395 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 15:57:15,396 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2022-11-23 15:57:15,396 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=125, Invalid=2527, Unknown=0, NotChecked=0, Total=2652 [2022-11-23 15:57:15,396 INFO L87 Difference]: Start difference. First operand 202 states and 267 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) [2022-11-23 15:57:16,404 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 15:57:16,404 INFO L93 Difference]: Finished difference Result 225 states and 295 transitions. [2022-11-23 15:57:16,404 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2022-11-23 15:57:16,405 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 [2022-11-23 15:57:16,406 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 15:57:16,408 INFO L225 Difference]: With dead ends: 225 [2022-11-23 15:57:16,408 INFO L226 Difference]: Without dead ends: 218 [2022-11-23 15:57:16,409 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1053 GetRequests, 893 SyntacticMatches, 110 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 572 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=125, Invalid=2527, Unknown=0, NotChecked=0, Total=2652 [2022-11-23 15:57:16,410 INFO L413 NwaCegarLoop]: 74 mSDtfsCounter, 0 mSDsluCounter, 2452 mSDsCounter, 0 mSdLazyCounter, 1787 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 2526 SdHoareTripleChecker+Invalid, 1787 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 1787 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2022-11-23 15:57:16,410 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [16 Valid, 2526 Invalid, 1787 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 1787 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2022-11-23 15:57:16,412 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 218 states. [2022-11-23 15:57:16,439 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 218 to 215. [2022-11-23 15:57:16,440 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 215 states, 151 states have (on average 1.1059602649006623) internal successors, (167), 142 states have internal predecessors, (167), 40 states have call successors, (40), 31 states have call predecessors, (40), 23 states have return successors, (78), 41 states have call predecessors, (78), 40 states have call successors, (78) [2022-11-23 15:57:16,442 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 215 states to 215 states and 285 transitions. [2022-11-23 15:57:16,443 INFO L78 Accepts]: Start accepts. Automaton has 215 states and 285 transitions. Word has length 459 [2022-11-23 15:57:16,445 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 15:57:16,445 INFO L495 AbstractCegarLoop]: Abstraction has 215 states and 285 transitions. [2022-11-23 15:57:16,445 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) [2022-11-23 15:57:16,446 INFO L276 IsEmpty]: Start isEmpty. Operand 215 states and 285 transitions. [2022-11-23 15:57:16,452 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 514 [2022-11-23 15:57:16,452 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 15:57:16,453 INFO L195 NwaCegarLoop]: trace histogram [38, 38, 37, 37, 31, 29, 19, 19, 19, 19, 19, 19, 19, 18, 18, 18, 18, 18, 18, 18, 13, 10, 8, 7, 1, 1, 1, 1, 1, 1] [2022-11-23 15:57:16,461 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af79cf74-59e5-490f-9e12-dca361e5b163/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2022-11-23 15:57:16,660 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af79cf74-59e5-490f-9e12-dca361e5b163/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:57:16,661 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 15:57:16,661 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 15:57:16,661 INFO L85 PathProgramCache]: Analyzing trace with hash 1830002930, now seen corresponding path program 13 times [2022-11-23 15:57:16,661 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 15:57:16,662 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1799454974] [2022-11-23 15:57:16,662 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:57:16,662 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 15:57:16,759 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:57:17,478 INFO L134 CoverageAnalysis]: Checked inductivity of 7643 backedges. 285 proven. 1084 refuted. 0 times theorem prover too weak. 6274 trivial. 0 not checked. [2022-11-23 15:57:17,478 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 15:57:17,478 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1799454974] [2022-11-23 15:57:17,478 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1799454974] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 15:57:17,478 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [10884465] [2022-11-23 15:57:17,478 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-23 15:57:17,478 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:57:17,479 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af79cf74-59e5-490f-9e12-dca361e5b163/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 15:57:17,480 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af79cf74-59e5-490f-9e12-dca361e5b163/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 15:57:17,509 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af79cf74-59e5-490f-9e12-dca361e5b163/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2022-11-23 15:57:17,945 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:57:17,950 INFO L263 TraceCheckSpWp]: Trace formula consists of 1164 conjuncts, 20 conjunts are in the unsatisfiable core [2022-11-23 15:57:17,956 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 15:57:18,119 INFO L134 CoverageAnalysis]: Checked inductivity of 7643 backedges. 281 proven. 1371 refuted. 0 times theorem prover too weak. 5991 trivial. 0 not checked. [2022-11-23 15:57:18,119 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 15:57:22,216 INFO L134 CoverageAnalysis]: Checked inductivity of 7643 backedges. 281 proven. 1411 refuted. 0 times theorem prover too weak. 5951 trivial. 0 not checked. [2022-11-23 15:57:22,217 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [10884465] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 15:57:22,218 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [579548253] [2022-11-23 15:57:22,219 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2022-11-23 15:57:22,219 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 15:57:22,220 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-23 15:57:22,221 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 15:57:22,221 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14, 21] total 27 [2022-11-23 15:57:22,221 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1317575697] [2022-11-23 15:57:22,222 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 15:57:22,222 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2022-11-23 15:57:22,223 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 15:57:22,223 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2022-11-23 15:57:22,223 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=127, Invalid=575, Unknown=0, NotChecked=0, Total=702 [2022-11-23 15:57:22,224 INFO L87 Difference]: Start difference. First operand 215 states and 285 transitions. Second operand has 27 states, 26 states have (on average 3.3076923076923075) internal successors, (86), 27 states have internal predecessors, (86), 21 states have call successors, (26), 1 states have call predecessors, (26), 11 states have return successors, (33), 13 states have call predecessors, (33), 21 states have call successors, (33) [2022-11-23 15:57:22,689 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 15:57:22,689 INFO L93 Difference]: Finished difference Result 245 states and 325 transitions. [2022-11-23 15:57:22,690 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-11-23 15:57:22,690 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 26 states have (on average 3.3076923076923075) internal successors, (86), 27 states have internal predecessors, (86), 21 states have call successors, (26), 1 states have call predecessors, (26), 11 states have return successors, (33), 13 states have call predecessors, (33), 21 states have call successors, (33) Word has length 513 [2022-11-23 15:57:22,691 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 15:57:22,693 INFO L225 Difference]: With dead ends: 245 [2022-11-23 15:57:22,693 INFO L226 Difference]: Without dead ends: 181 [2022-11-23 15:57:22,694 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1052 GetRequests, 1008 SyntacticMatches, 10 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 433 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=255, Invalid=1005, Unknown=0, NotChecked=0, Total=1260 [2022-11-23 15:57:22,695 INFO L413 NwaCegarLoop]: 46 mSDtfsCounter, 49 mSDsluCounter, 262 mSDsCounter, 0 mSdLazyCounter, 482 mSolverCounterSat, 47 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 51 SdHoareTripleChecker+Valid, 308 SdHoareTripleChecker+Invalid, 529 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 47 IncrementalHoareTripleChecker+Valid, 482 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-23 15:57:22,695 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [51 Valid, 308 Invalid, 529 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [47 Valid, 482 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-23 15:57:22,696 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 181 states. [2022-11-23 15:57:22,711 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 181 to 178. [2022-11-23 15:57:22,711 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 178 states, 125 states have (on average 1.12) internal successors, (140), 119 states have internal predecessors, (140), 33 states have call successors, (33), 26 states have call predecessors, (33), 19 states have return successors, (53), 32 states have call predecessors, (53), 33 states have call successors, (53) [2022-11-23 15:57:22,712 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 178 states to 178 states and 226 transitions. [2022-11-23 15:57:22,713 INFO L78 Accepts]: Start accepts. Automaton has 178 states and 226 transitions. Word has length 513 [2022-11-23 15:57:22,713 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 15:57:22,713 INFO L495 AbstractCegarLoop]: Abstraction has 178 states and 226 transitions. [2022-11-23 15:57:22,714 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 26 states have (on average 3.3076923076923075) internal successors, (86), 27 states have internal predecessors, (86), 21 states have call successors, (26), 1 states have call predecessors, (26), 11 states have return successors, (33), 13 states have call predecessors, (33), 21 states have call successors, (33) [2022-11-23 15:57:22,714 INFO L276 IsEmpty]: Start isEmpty. Operand 178 states and 226 transitions. [2022-11-23 15:57:22,717 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 487 [2022-11-23 15:57:22,717 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 15:57:22,718 INFO L195 NwaCegarLoop]: trace histogram [36, 36, 35, 35, 29, 28, 18, 18, 18, 18, 18, 18, 18, 17, 17, 17, 17, 17, 17, 17, 12, 10, 7, 7, 1, 1, 1, 1, 1, 1] [2022-11-23 15:57:22,726 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af79cf74-59e5-490f-9e12-dca361e5b163/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2022-11-23 15:57:22,925 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af79cf74-59e5-490f-9e12-dca361e5b163/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:57:22,926 INFO L420 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 15:57:22,926 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 15:57:22,926 INFO L85 PathProgramCache]: Analyzing trace with hash 889476866, now seen corresponding path program 14 times [2022-11-23 15:57:22,926 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 15:57:22,926 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1423155049] [2022-11-23 15:57:22,926 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:57:22,926 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 15:57:22,977 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:57:23,461 INFO L134 CoverageAnalysis]: Checked inductivity of 6840 backedges. 791 proven. 154 refuted. 0 times theorem prover too weak. 5895 trivial. 0 not checked. [2022-11-23 15:57:23,461 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 15:57:23,461 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1423155049] [2022-11-23 15:57:23,461 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1423155049] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 15:57:23,461 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1221525874] [2022-11-23 15:57:23,462 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-23 15:57:23,462 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:57:23,462 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af79cf74-59e5-490f-9e12-dca361e5b163/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 15:57:23,463 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af79cf74-59e5-490f-9e12-dca361e5b163/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 15:57:23,491 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af79cf74-59e5-490f-9e12-dca361e5b163/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2022-11-23 15:57:23,852 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2022-11-23 15:57:23,853 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 15:57:23,854 INFO L263 TraceCheckSpWp]: Trace formula consists of 270 conjuncts, 12 conjunts are in the unsatisfiable core [2022-11-23 15:57:23,860 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 15:57:24,006 INFO L134 CoverageAnalysis]: Checked inductivity of 6840 backedges. 1039 proven. 31 refuted. 0 times theorem prover too weak. 5770 trivial. 0 not checked. [2022-11-23 15:57:24,006 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 15:57:25,588 INFO L134 CoverageAnalysis]: Checked inductivity of 6840 backedges. 1039 proven. 32 refuted. 0 times theorem prover too weak. 5769 trivial. 0 not checked. [2022-11-23 15:57:25,589 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1221525874] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 15:57:25,589 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [577237683] [2022-11-23 15:57:25,590 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2022-11-23 15:57:25,590 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 15:57:25,590 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-23 15:57:25,591 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 15:57:25,592 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12, 13] total 24 [2022-11-23 15:57:25,592 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [282759444] [2022-11-23 15:57:25,592 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 15:57:25,593 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2022-11-23 15:57:25,593 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 15:57:25,593 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2022-11-23 15:57:25,594 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=474, Unknown=0, NotChecked=0, Total=552 [2022-11-23 15:57:25,594 INFO L87 Difference]: Start difference. First operand 178 states and 226 transitions. Second operand has 24 states, 23 states have (on average 3.347826086956522) internal successors, (77), 24 states have internal predecessors, (77), 12 states have call successors, (22), 1 states have call predecessors, (22), 10 states have return successors, (28), 15 states have call predecessors, (28), 12 states have call successors, (28) [2022-11-23 15:57:25,987 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 15:57:25,988 INFO L93 Difference]: Finished difference Result 304 states and 388 transitions. [2022-11-23 15:57:25,988 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2022-11-23 15:57:25,988 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 23 states have (on average 3.347826086956522) internal successors, (77), 24 states have internal predecessors, (77), 12 states have call successors, (22), 1 states have call predecessors, (22), 10 states have return successors, (28), 15 states have call predecessors, (28), 12 states have call successors, (28) Word has length 486 [2022-11-23 15:57:25,989 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 15:57:25,990 INFO L225 Difference]: With dead ends: 304 [2022-11-23 15:57:25,990 INFO L226 Difference]: Without dead ends: 165 [2022-11-23 15:57:25,992 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 996 GetRequests, 957 SyntacticMatches, 6 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 261 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=191, Invalid=999, Unknown=0, NotChecked=0, Total=1190 [2022-11-23 15:57:25,992 INFO L413 NwaCegarLoop]: 27 mSDtfsCounter, 72 mSDsluCounter, 174 mSDsCounter, 0 mSdLazyCounter, 366 mSolverCounterSat, 44 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 73 SdHoareTripleChecker+Valid, 201 SdHoareTripleChecker+Invalid, 410 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 44 IncrementalHoareTripleChecker+Valid, 366 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-23 15:57:25,993 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [73 Valid, 201 Invalid, 410 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [44 Valid, 366 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-23 15:57:25,993 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 165 states. [2022-11-23 15:57:26,005 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 165 to 158. [2022-11-23 15:57:26,006 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 158 states, 112 states have (on average 1.1071428571428572) internal successors, (124), 107 states have internal predecessors, (124), 29 states have call successors, (29), 24 states have call predecessors, (29), 16 states have return successors, (35), 26 states have call predecessors, (35), 29 states have call successors, (35) [2022-11-23 15:57:26,007 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 158 states to 158 states and 188 transitions. [2022-11-23 15:57:26,007 INFO L78 Accepts]: Start accepts. Automaton has 158 states and 188 transitions. Word has length 486 [2022-11-23 15:57:26,008 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 15:57:26,008 INFO L495 AbstractCegarLoop]: Abstraction has 158 states and 188 transitions. [2022-11-23 15:57:26,008 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 23 states have (on average 3.347826086956522) internal successors, (77), 24 states have internal predecessors, (77), 12 states have call successors, (22), 1 states have call predecessors, (22), 10 states have return successors, (28), 15 states have call predecessors, (28), 12 states have call successors, (28) [2022-11-23 15:57:26,008 INFO L276 IsEmpty]: Start isEmpty. Operand 158 states and 188 transitions. [2022-11-23 15:57:26,011 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 419 [2022-11-23 15:57:26,011 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 15:57:26,011 INFO L195 NwaCegarLoop]: trace histogram [31, 31, 30, 30, 25, 24, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 10, 9, 6, 6, 1, 1, 1, 1, 1, 1] [2022-11-23 15:57:26,024 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af79cf74-59e5-490f-9e12-dca361e5b163/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2022-11-23 15:57:26,217 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af79cf74-59e5-490f-9e12-dca361e5b163/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable20 [2022-11-23 15:57:26,218 INFO L420 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 15:57:26,218 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 15:57:26,218 INFO L85 PathProgramCache]: Analyzing trace with hash 1380611669, now seen corresponding path program 15 times [2022-11-23 15:57:26,218 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 15:57:26,218 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1736509732] [2022-11-23 15:57:26,218 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 15:57:26,218 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 15:57:26,258 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 15:57:26,549 INFO L134 CoverageAnalysis]: Checked inductivity of 5016 backedges. 341 proven. 409 refuted. 0 times theorem prover too weak. 4266 trivial. 0 not checked. [2022-11-23 15:57:26,549 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 15:57:26,549 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1736509732] [2022-11-23 15:57:26,550 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1736509732] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 15:57:26,550 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1293270710] [2022-11-23 15:57:26,550 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-23 15:57:26,550 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:57:26,550 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af79cf74-59e5-490f-9e12-dca361e5b163/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 15:57:26,551 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af79cf74-59e5-490f-9e12-dca361e5b163/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 15:57:26,571 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af79cf74-59e5-490f-9e12-dca361e5b163/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2022-11-23 15:57:26,929 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-23 15:57:26,929 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 15:57:26,931 INFO L263 TraceCheckSpWp]: Trace formula consists of 743 conjuncts, 22 conjunts are in the unsatisfiable core [2022-11-23 15:57:26,935 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 15:57:27,191 INFO L134 CoverageAnalysis]: Checked inductivity of 5016 backedges. 2839 proven. 427 refuted. 0 times theorem prover too weak. 1750 trivial. 0 not checked. [2022-11-23 15:57:27,191 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 15:57:30,218 INFO L134 CoverageAnalysis]: Checked inductivity of 5016 backedges. 425 proven. 1169 refuted. 0 times theorem prover too weak. 3422 trivial. 0 not checked. [2022-11-23 15:57:30,218 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1293270710] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 15:57:30,218 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1354936087] [2022-11-23 15:57:30,220 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2022-11-23 15:57:30,220 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 15:57:30,220 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-23 15:57:30,220 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 15:57:30,221 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 17, 23] total 31 [2022-11-23 15:57:30,221 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [256888593] [2022-11-23 15:57:30,221 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 15:57:30,221 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2022-11-23 15:57:30,222 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 15:57:30,222 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2022-11-23 15:57:30,222 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=106, Invalid=824, Unknown=0, NotChecked=0, Total=930 [2022-11-23 15:57:30,223 INFO L87 Difference]: Start difference. First operand 158 states and 188 transitions. Second operand has 31 states, 30 states have (on average 3.8666666666666667) internal successors, (116), 31 states have internal predecessors, (116), 25 states have call successors, (34), 2 states have call predecessors, (34), 15 states have return successors, (43), 14 states have call predecessors, (43), 25 states have call successors, (43) [2022-11-23 15:57:31,485 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 15:57:31,486 INFO L93 Difference]: Finished difference Result 298 states and 369 transitions. [2022-11-23 15:57:31,486 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2022-11-23 15:57:31,487 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 30 states have (on average 3.8666666666666667) internal successors, (116), 31 states have internal predecessors, (116), 25 states have call successors, (34), 2 states have call predecessors, (34), 15 states have return successors, (43), 14 states have call predecessors, (43), 25 states have call successors, (43) Word has length 418 [2022-11-23 15:57:31,487 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 15:57:31,488 INFO L225 Difference]: With dead ends: 298 [2022-11-23 15:57:31,488 INFO L226 Difference]: Without dead ends: 0 [2022-11-23 15:57:31,490 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 880 GetRequests, 807 SyntacticMatches, 11 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 998 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=587, Invalid=3445, Unknown=0, NotChecked=0, Total=4032 [2022-11-23 15:57:31,491 INFO L413 NwaCegarLoop]: 34 mSDtfsCounter, 140 mSDsluCounter, 288 mSDsCounter, 0 mSdLazyCounter, 1184 mSolverCounterSat, 176 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 140 SdHoareTripleChecker+Valid, 322 SdHoareTripleChecker+Invalid, 1360 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 176 IncrementalHoareTripleChecker+Valid, 1184 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-11-23 15:57:31,491 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [140 Valid, 322 Invalid, 1360 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [176 Valid, 1184 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-11-23 15:57:31,491 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2022-11-23 15:57:31,492 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2022-11-23 15:57:31,492 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) [2022-11-23 15:57:31,492 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2022-11-23 15:57:31,492 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 418 [2022-11-23 15:57:31,493 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 15:57:31,493 INFO L495 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2022-11-23 15:57:31,493 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 30 states have (on average 3.8666666666666667) internal successors, (116), 31 states have internal predecessors, (116), 25 states have call successors, (34), 2 states have call predecessors, (34), 15 states have return successors, (43), 14 states have call predecessors, (43), 25 states have call successors, (43) [2022-11-23 15:57:31,493 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2022-11-23 15:57:31,493 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2022-11-23 15:57:31,496 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION (0 of 1 remaining) [2022-11-23 15:57:31,504 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af79cf74-59e5-490f-9e12-dca361e5b163/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2022-11-23 15:57:31,704 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21,21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af79cf74-59e5-490f-9e12-dca361e5b163/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 15:57:31,706 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2022-11-23 15:57:54,810 INFO L899 garLoopResultBuilder]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2022-11-23 15:57:54,810 INFO L899 garLoopResultBuilder]: For program point ULTIMATE.startENTRY(line -1) no Hoare annotation was computed. [2022-11-23 15:57:54,810 INFO L899 garLoopResultBuilder]: For program point ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION(line 41) no Hoare annotation was computed. [2022-11-23 15:57:54,810 INFO L899 garLoopResultBuilder]: For program point L41(line 41) no Hoare annotation was computed. [2022-11-23 15:57:54,811 INFO L899 garLoopResultBuilder]: For program point L40(lines 40 42) no Hoare annotation was computed. [2022-11-23 15:57:54,811 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))) [2022-11-23 15:57:54,812 INFO L899 garLoopResultBuilder]: For program point L39-1(line 39) no Hoare annotation was computed. [2022-11-23 15:57:54,812 INFO L895 garLoopResultBuilder]: At program point L40-2(lines 40 42) the Hoare annotation is: (<= 8 |ULTIMATE.start_main_~x~0#1|) [2022-11-23 15:57:54,812 INFO L902 garLoopResultBuilder]: At program point fibo2ENTRY(lines 19 27) the Hoare annotation is: true [2022-11-23 15:57:54,812 INFO L895 garLoopResultBuilder]: At program point L25(line 25) the Hoare annotation is: (and (<= |fibo2_#in~n| fibo2_~n) (not (<= |fibo2_#in~n| 2)) (<= fibo2_~n |fibo2_#in~n|)) [2022-11-23 15:57:54,813 INFO L899 garLoopResultBuilder]: For program point L25-1(line 25) no Hoare annotation was computed. [2022-11-23 15:57:54,813 INFO L895 garLoopResultBuilder]: At program point L25-2(line 25) the Hoare annotation is: (let ((.cse0 (<= |fibo2_#in~n| 4))) (and (or .cse0 (and (<= 3 |fibo2_#t~ret6|) (<= |fibo2_#t~ret6| 3) (<= |fibo2_#in~n| 5)) (<= 7 |fibo2_#in~n|) (and (<= |fibo2_#t~ret6| 5) (<= 6 |fibo2_#in~n|) (<= 5 |fibo2_#t~ret6|))) (<= |fibo2_#in~n| fibo2_~n) (<= 3 |fibo2_#in~n|) (or (and (<= |fibo2_#in~n| 3) (<= |fibo2_#t~ret6| 1) (<= 1 |fibo2_#t~ret6|)) (not .cse0)) (<= fibo2_~n |fibo2_#in~n|) (let ((.cse1 (select |#memory_int| 1))) (or (and (<= 8 |fibo2_#t~ret6|) (<= |fibo2_#t~ret6| 8)) (not (= (select .cse1 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 .cse1 1) 0)) (not (= (select |#valid| 1) 1)) (not (= 18 (select |#length| 2))) (not (= |#NULL.base| 0)) (not (= (select |#valid| 2) 1)))))) [2022-11-23 15:57:54,813 INFO L899 garLoopResultBuilder]: For program point L22(lines 22 26) no Hoare annotation was computed. [2022-11-23 15:57:54,813 INFO L899 garLoopResultBuilder]: For program point L25-3(line 25) no Hoare annotation was computed. [2022-11-23 15:57:54,814 INFO L899 garLoopResultBuilder]: For program point L20(lines 20 26) no Hoare annotation was computed. [2022-11-23 15:57:54,814 INFO L899 garLoopResultBuilder]: For program point fibo2FINAL(lines 19 27) no Hoare annotation was computed. [2022-11-23 15:57:54,814 INFO L899 garLoopResultBuilder]: For program point fibo2EXIT(lines 19 27) no Hoare annotation was computed. [2022-11-23 15:57:54,814 INFO L902 garLoopResultBuilder]: At program point fibo1ENTRY(lines 9 17) the Hoare annotation is: true [2022-11-23 15:57:54,814 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_#in~n| 2))) [2022-11-23 15:57:54,814 INFO L899 garLoopResultBuilder]: For program point L15-1(line 15) no Hoare annotation was computed. [2022-11-23 15:57:54,815 INFO L895 garLoopResultBuilder]: At program point L15-2(line 15) the Hoare annotation is: (let ((.cse1 (and (<= 4 |fibo1_#in~n|) (<= |fibo1_#in~n| 4) (<= 2 |fibo1_#t~ret4|) (<= |fibo1_#t~ret4| 2))) (.cse0 (<= |fibo1_#in~n| 5))) (and (or .cse0 (<= 7 |fibo1_#in~n|) (and (<= |fibo1_#t~ret4| 5) (<= 5 |fibo1_#t~ret4|))) (or .cse1 (<= 5 |fibo1_#in~n|) (= |fibo1_#t~ret4| 1)) (<= 3 fibo1_~n) (<= fibo1_~n |fibo1_#in~n|) (let ((.cse2 (select |#memory_int| 1))) (or (and (<= 13 |fibo1_#t~ret4|) (<= |fibo1_#t~ret4| 13)) (not (= (select .cse2 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 .cse2 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)))) (<= |fibo1_#in~n| fibo1_~n) (or .cse1 (<= |fibo1_#in~n| 3) (not .cse0) (and (<= 3 |fibo1_#t~ret4|) (<= |fibo1_#t~ret4| 3))))) [2022-11-23 15:57:54,815 INFO L899 garLoopResultBuilder]: For program point L12(lines 12 16) no Hoare annotation was computed. [2022-11-23 15:57:54,815 INFO L899 garLoopResultBuilder]: For program point L15-3(line 15) no Hoare annotation was computed. [2022-11-23 15:57:54,815 INFO L899 garLoopResultBuilder]: For program point fibo1FINAL(lines 9 17) no Hoare annotation was computed. [2022-11-23 15:57:54,816 INFO L899 garLoopResultBuilder]: For program point L10(lines 10 16) no Hoare annotation was computed. [2022-11-23 15:57:54,816 INFO L899 garLoopResultBuilder]: For program point fibo1EXIT(lines 9 17) no Hoare annotation was computed. [2022-11-23 15:57:54,819 INFO L444 BasicCegarLoop]: Path program histogram: [15, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 15:57:54,822 INFO L178 ceAbstractionStarter]: Computing trace abstraction results [2022-11-23 15:57:54,845 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 23.11 03:57:54 BoogieIcfgContainer [2022-11-23 15:57:54,845 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2022-11-23 15:57:54,845 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2022-11-23 15:57:54,845 INFO L271 PluginConnector]: Initializing Witness Printer... [2022-11-23 15:57:54,845 INFO L275 PluginConnector]: Witness Printer initialized [2022-11-23 15:57:54,846 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 03:56:01" (3/4) ... [2022-11-23 15:57:54,848 INFO L137 WitnessPrinter]: Generating witness for correct program [2022-11-23 15:57:54,853 INFO L361 RCFGBacktranslator]: Ignoring RootEdge to procedure fibo2 [2022-11-23 15:57:54,853 INFO L361 RCFGBacktranslator]: Ignoring RootEdge to procedure fibo1 [2022-11-23 15:57:54,857 INFO L915 BoogieBacktranslator]: Reduced CFG by removing 13 nodes and edges [2022-11-23 15:57:54,857 INFO L915 BoogieBacktranslator]: Reduced CFG by removing 5 nodes and edges [2022-11-23 15:57:54,857 INFO L915 BoogieBacktranslator]: Reduced CFG by removing 3 nodes and edges [2022-11-23 15:57:54,858 INFO L915 BoogieBacktranslator]: Reduced CFG by removing 1 nodes and edges [2022-11-23 15:57:54,889 INFO L141 WitnessManager]: Wrote witness to /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af79cf74-59e5-490f-9e12-dca361e5b163/bin/utaipan-Q6hlc19bkW/witness.graphml [2022-11-23 15:57:54,890 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2022-11-23 15:57:54,890 INFO L158 Benchmark]: Toolchain (without parser) took 114690.42ms. Allocated memory was 140.5MB in the beginning and 1.6GB in the end (delta: 1.4GB). Free memory was 103.8MB in the beginning and 1.5GB in the end (delta: -1.4GB). Peak memory consumption was 16.7MB. Max. memory is 16.1GB. [2022-11-23 15:57:54,890 INFO L158 Benchmark]: CDTParser took 0.30ms. Allocated memory is still 113.2MB. Free memory is still 84.6MB. There was no memory consumed. Max. memory is 16.1GB. [2022-11-23 15:57:54,891 INFO L158 Benchmark]: CACSL2BoogieTranslator took 321.88ms. Allocated memory is still 140.5MB. Free memory was 103.3MB in the beginning and 112.4MB in the end (delta: -9.2MB). Peak memory consumption was 10.5MB. Max. memory is 16.1GB. [2022-11-23 15:57:54,891 INFO L158 Benchmark]: Boogie Procedure Inliner took 38.32ms. Allocated memory is still 140.5MB. Free memory was 112.4MB in the beginning and 111.2MB in the end (delta: 1.3MB). There was no memory consumed. Max. memory is 16.1GB. [2022-11-23 15:57:54,891 INFO L158 Benchmark]: Boogie Preprocessor took 49.87ms. Allocated memory is still 140.5MB. Free memory was 111.2MB in the beginning and 110.3MB in the end (delta: 931.2kB). There was no memory consumed. Max. memory is 16.1GB. [2022-11-23 15:57:54,892 INFO L158 Benchmark]: RCFGBuilder took 461.91ms. Allocated memory is still 140.5MB. Free memory was 110.3MB in the beginning and 99.2MB in the end (delta: 11.1MB). Peak memory consumption was 12.6MB. Max. memory is 16.1GB. [2022-11-23 15:57:54,892 INFO L158 Benchmark]: TraceAbstraction took 113765.88ms. Allocated memory was 140.5MB in the beginning and 1.6GB in the end (delta: 1.4GB). Free memory was 98.6MB in the beginning and 1.5GB in the end (delta: -1.4GB). Peak memory consumption was 958.0MB. Max. memory is 16.1GB. [2022-11-23 15:57:54,892 INFO L158 Benchmark]: Witness Printer took 44.41ms. Allocated memory is still 1.6GB. Free memory was 1.5GB in the beginning and 1.5GB in the end (delta: 2.1MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. [2022-11-23 15:57:54,894 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.30ms. Allocated memory is still 113.2MB. Free memory is still 84.6MB. There was no memory consumed. Max. memory is 16.1GB. * CACSL2BoogieTranslator took 321.88ms. Allocated memory is still 140.5MB. Free memory was 103.3MB in the beginning and 112.4MB in the end (delta: -9.2MB). Peak memory consumption was 10.5MB. Max. memory is 16.1GB. * Boogie Procedure Inliner took 38.32ms. Allocated memory is still 140.5MB. Free memory was 112.4MB in the beginning and 111.2MB in the end (delta: 1.3MB). There was no memory consumed. Max. memory is 16.1GB. * Boogie Preprocessor took 49.87ms. Allocated memory is still 140.5MB. Free memory was 111.2MB in the beginning and 110.3MB in the end (delta: 931.2kB). There was no memory consumed. Max. memory is 16.1GB. * RCFGBuilder took 461.91ms. Allocated memory is still 140.5MB. Free memory was 110.3MB in the beginning and 99.2MB in the end (delta: 11.1MB). Peak memory consumption was 12.6MB. Max. memory is 16.1GB. * TraceAbstraction took 113765.88ms. Allocated memory was 140.5MB in the beginning and 1.6GB in the end (delta: 1.4GB). Free memory was 98.6MB in the beginning and 1.5GB in the end (delta: -1.4GB). Peak memory consumption was 958.0MB. Max. memory is 16.1GB. * Witness Printer took 44.41ms. Allocated memory is still 1.6GB. Free memory was 1.5GB in the beginning and 1.5GB in the end (delta: 2.1MB). 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: 113.6s, OverallIterations: 22, TraceHistogramMax: 49, PathProgramHistogramMax: 15, EmptinessCheckTime: 0.1s, AutomataDifference: 15.0s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 23.1s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 0 mSolverCounterUnknown, 1820 SdHoareTripleChecker+Valid, 9.3s IncrementalHoareTripleChecker+Time, 0 mSdLazyCounter, 1717 mSDsluCounter, 6502 SdHoareTripleChecker+Invalid, 7.8s Time, 0 mProtectedAction, 0 SdHoareTripleChecker+Unchecked, 0 IncrementalHoareTripleChecker+Unchecked, 5837 mSDsCounter, 2068 IncrementalHoareTripleChecker+Valid, 0 mProtectedPredicate, 12036 IncrementalHoareTripleChecker+Invalid, 14104 SdHoareTripleChecker+Unknown, 0 mSolverCounterNotChecked, 2068 mSolverCounterUnsat, 665 mSDtfsCounter, 12036 mSolverCounterSat, 0.2s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Unknown, PredicateUnifierStatistics: 0 DeclaredPredicates, 13581 GetRequests, 12654 SyntacticMatches, 231 SemanticMatches, 696 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6512 ImplicationChecksByTransitivity, 12.3s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=297occurred in iteration=15, InterpolantAutomatonStates: 450, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.6s AutomataMinimizationTime, 22 MinimizatonAttempts, 363 StatesRemovedByMinimization, 20 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 8 LocationsWithAnnotation, 1214 PreInvPairs, 2978 NumberOfFragments, 377 HoareAnnotationTreeSize, 1214 FomulaSimplifications, 335601 FormulaSimplificationTreeSizeReduction, 18.9s HoareSimplificationTime, 8 FomulaSimplificationsInter, 160226 FormulaSimplificationTreeSizeReductionInter, 4.2s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.7s SsaConstructionTime, 2.6s SatisfiabilityAnalysisTime, 62.8s InterpolantComputationTime, 12943 NumberOfCodeBlocks, 11154 NumberOfCodeBlocksAsserted, 76 NumberOfCheckSat, 19343 ConstructedInterpolants, 0 QuantifiedInterpolants, 28687 SizeOfPredicates, 108 NumberOfNonLiveVariables, 10601 ConjunctsInSsa, 523 ConjunctsInUnsatCore, 62 InterpolantComputations, 2 PerfectInterpolantSequences, 228507/257019 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: 0.2s, 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! [2022-11-23 15:57:54,940 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_af79cf74-59e5-490f-9e12-dca361e5b163/bin/utaipan-Q6hlc19bkW/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