./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/recursive-simple/fibo_2calls_25-2.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 30e01a73 Calling Ultimate with: /usr/lib/jvm/java-1.11.0-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98125d69-4d63-40cd-9481-f0d7d69944d1/bin/utaipan-verify-mE87zJ7Ire/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98125d69-4d63-40cd-9481-f0d7d69944d1/bin/utaipan-verify-mE87zJ7Ire/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98125d69-4d63-40cd-9481-f0d7d69944d1/bin/utaipan-verify-mE87zJ7Ire/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98125d69-4d63-40cd-9481-f0d7d69944d1/bin/utaipan-verify-mE87zJ7Ire/config/TaipanReach.xml -i ../../sv-benchmarks/c/recursive-simple/fibo_2calls_25-2.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98125d69-4d63-40cd-9481-f0d7d69944d1/bin/utaipan-verify-mE87zJ7Ire/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98125d69-4d63-40cd-9481-f0d7d69944d1/bin/utaipan-verify-mE87zJ7Ire --witnessprinter.witness.filename witness --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 a9cccea737f311e9e2585bb4c0fd7fa7e4382857df72468b846279ab5798480b --- Real Ultimate output --- This is Ultimate 0.2.3-dev-30e01a7 [2023-11-23 20:39:36,753 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-23 20:39:36,829 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98125d69-4d63-40cd-9481-f0d7d69944d1/bin/utaipan-verify-mE87zJ7Ire/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-11-23 20:39:36,835 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-23 20:39:36,836 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-23 20:39:36,864 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-23 20:39:36,865 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-23 20:39:36,865 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-23 20:39:36,866 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-23 20:39:36,867 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-23 20:39:36,867 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-23 20:39:36,868 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-23 20:39:36,869 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-23 20:39:36,869 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-23 20:39:36,870 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-23 20:39:36,870 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-23 20:39:36,870 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-23 20:39:36,871 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-23 20:39:36,871 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-23 20:39:36,872 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-23 20:39:36,872 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-23 20:39:36,874 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-23 20:39:36,876 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-23 20:39:36,876 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-11-23 20:39:36,876 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-23 20:39:36,877 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-23 20:39:36,877 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-23 20:39:36,878 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-23 20:39:36,878 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-11-23 20:39:36,879 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-23 20:39:36,880 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-11-23 20:39:36,880 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-23 20:39:36,881 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-11-23 20:39:36,881 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-23 20:39:36,881 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-23 20:39:36,881 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-11-23 20:39:36,882 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-23 20:39:36,882 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-23 20:39:36,882 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-23 20:39:36,882 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-23 20:39:36,883 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-11-23 20:39:36,883 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-23 20:39:36,883 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-23 20:39:36,884 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-11-23 20:39:36,884 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-11-23 20:39:36,884 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-23 20:39:36,885 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-23 20:39:36,885 INFO L153 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98125d69-4d63-40cd-9481-f0d7d69944d1/bin/utaipan-verify-mE87zJ7Ire/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98125d69-4d63-40cd-9481-f0d7d69944d1/bin/utaipan-verify-mE87zJ7Ire Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> a9cccea737f311e9e2585bb4c0fd7fa7e4382857df72468b846279ab5798480b [2023-11-23 20:39:37,195 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-23 20:39:37,232 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-23 20:39:37,235 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-23 20:39:37,239 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-23 20:39:37,239 INFO L274 PluginConnector]: CDTParser initialized [2023-11-23 20:39:37,241 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98125d69-4d63-40cd-9481-f0d7d69944d1/bin/utaipan-verify-mE87zJ7Ire/../../sv-benchmarks/c/recursive-simple/fibo_2calls_25-2.c [2023-11-23 20:39:40,197 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-23 20:39:40,534 INFO L384 CDTParser]: Found 1 translation units. [2023-11-23 20:39:40,535 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98125d69-4d63-40cd-9481-f0d7d69944d1/sv-benchmarks/c/recursive-simple/fibo_2calls_25-2.c [2023-11-23 20:39:40,545 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98125d69-4d63-40cd-9481-f0d7d69944d1/bin/utaipan-verify-mE87zJ7Ire/data/47ceffcd2/e84d8c167ef2455e8b5e2c40a388f19d/FLAG877743a1e [2023-11-23 20:39:40,566 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98125d69-4d63-40cd-9481-f0d7d69944d1/bin/utaipan-verify-mE87zJ7Ire/data/47ceffcd2/e84d8c167ef2455e8b5e2c40a388f19d [2023-11-23 20:39:40,575 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-23 20:39:40,578 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-23 20:39:40,580 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-23 20:39:40,580 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-23 20:39:40,586 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-23 20:39:40,587 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 08:39:40" (1/1) ... [2023-11-23 20:39:40,588 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4467e58a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:39:40, skipping insertion in model container [2023-11-23 20:39:40,589 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 08:39:40" (1/1) ... [2023-11-23 20:39:40,615 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-23 20:39:40,815 WARN L240 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_98125d69-4d63-40cd-9481-f0d7d69944d1/sv-benchmarks/c/recursive-simple/fibo_2calls_25-2.c[952,965] [2023-11-23 20:39:40,820 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-23 20:39:40,832 INFO L202 MainTranslator]: Completed pre-run [2023-11-23 20:39:40,848 WARN L240 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_98125d69-4d63-40cd-9481-f0d7d69944d1/sv-benchmarks/c/recursive-simple/fibo_2calls_25-2.c[952,965] [2023-11-23 20:39:40,849 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-23 20:39:40,865 INFO L206 MainTranslator]: Completed translation [2023-11-23 20:39:40,866 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:39:40 WrapperNode [2023-11-23 20:39:40,866 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-23 20:39:40,867 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-23 20:39:40,868 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-23 20:39:40,868 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-23 20:39:40,877 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:39:40" (1/1) ... [2023-11-23 20:39:40,884 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:39:40" (1/1) ... [2023-11-23 20:39:40,901 INFO L138 Inliner]: procedures = 14, calls = 12, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 20 [2023-11-23 20:39:40,902 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-23 20:39:40,903 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-23 20:39:40,903 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-23 20:39:40,903 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-23 20:39:40,913 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:39:40" (1/1) ... [2023-11-23 20:39:40,913 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:39:40" (1/1) ... [2023-11-23 20:39:40,928 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:39:40" (1/1) ... [2023-11-23 20:39:40,928 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:39:40" (1/1) ... [2023-11-23 20:39:40,931 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:39:40" (1/1) ... [2023-11-23 20:39:40,934 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:39:40" (1/1) ... [2023-11-23 20:39:40,937 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:39:40" (1/1) ... [2023-11-23 20:39:40,945 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:39:40" (1/1) ... [2023-11-23 20:39:40,947 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-23 20:39:40,948 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-23 20:39:40,948 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-23 20:39:40,949 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-23 20:39:40,950 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:39:40" (1/1) ... [2023-11-23 20:39:40,966 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-23 20:39:40,990 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98125d69-4d63-40cd-9481-f0d7d69944d1/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 20:39:41,009 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98125d69-4d63-40cd-9481-f0d7d69944d1/bin/utaipan-verify-mE87zJ7Ire/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-23 20:39:41,039 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98125d69-4d63-40cd-9481-f0d7d69944d1/bin/utaipan-verify-mE87zJ7Ire/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-23 20:39:41,063 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-23 20:39:41,064 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-23 20:39:41,064 INFO L130 BoogieDeclarations]: Found specification of procedure fibo2 [2023-11-23 20:39:41,064 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo2 [2023-11-23 20:39:41,066 INFO L130 BoogieDeclarations]: Found specification of procedure fibo1 [2023-11-23 20:39:41,067 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo1 [2023-11-23 20:39:41,067 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-23 20:39:41,067 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-23 20:39:41,149 INFO L241 CfgBuilder]: Building ICFG [2023-11-23 20:39:41,153 INFO L267 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-23 20:39:41,306 INFO L282 CfgBuilder]: Performing block encoding [2023-11-23 20:39:41,337 INFO L304 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-23 20:39:41,337 INFO L309 CfgBuilder]: Removed 0 assume(true) statements. [2023-11-23 20:39:41,339 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 08:39:41 BoogieIcfgContainer [2023-11-23 20:39:41,339 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-23 20:39:41,347 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-23 20:39:41,347 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-23 20:39:41,353 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-23 20:39:41,353 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 08:39:40" (1/3) ... [2023-11-23 20:39:41,354 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@37f73365 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 08:39:41, skipping insertion in model container [2023-11-23 20:39:41,354 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:39:40" (2/3) ... [2023-11-23 20:39:41,356 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@37f73365 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 08:39:41, skipping insertion in model container [2023-11-23 20:39:41,357 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 08:39:41" (3/3) ... [2023-11-23 20:39:41,359 INFO L112 eAbstractionObserver]: Analyzing ICFG fibo_2calls_25-2.c [2023-11-23 20:39:41,380 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-23 20:39:41,380 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-11-23 20:39:41,431 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-23 20:39:41,438 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=LoopHeads, 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;@15bd058d, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-23 20:39:41,438 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-11-23 20:39:41,442 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) [2023-11-23 20:39:41,451 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2023-11-23 20:39:41,451 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:39:41,451 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 20:39:41,452 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 20:39:41,458 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:39:41,459 INFO L85 PathProgramCache]: Analyzing trace with hash -389521846, now seen corresponding path program 1 times [2023-11-23 20:39:41,471 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:39:41,472 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1191540194] [2023-11-23 20:39:41,472 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:39:41,473 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:39:41,592 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:39:41,721 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 20:39:41,721 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:39:41,722 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1191540194] [2023-11-23 20:39:41,722 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1191540194] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 20:39:41,723 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 20:39:41,723 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-11-23 20:39:41,725 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1225587432] [2023-11-23 20:39:41,726 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 20:39:41,731 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-23 20:39:41,731 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:39:41,766 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-23 20:39:41,767 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-11-23 20:39:41,770 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) [2023-11-23 20:39:41,933 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:39:41,933 INFO L93 Difference]: Finished difference Result 34 states and 43 transitions. [2023-11-23 20:39:41,935 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-11-23 20:39:41,937 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 [2023-11-23 20:39:41,937 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:39:41,946 INFO L225 Difference]: With dead ends: 34 [2023-11-23 20:39:41,946 INFO L226 Difference]: Without dead ends: 26 [2023-11-23 20:39:41,949 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 [2023-11-23 20:39:41,954 INFO L413 NwaCegarLoop]: 23 mSDtfsCounter, 12 mSDsluCounter, 50 mSDsCounter, 0 mSdLazyCounter, 38 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 73 SdHoareTripleChecker+Invalid, 38 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 38 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 20:39:41,955 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [15 Valid, 73 Invalid, 38 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 38 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 20:39:41,976 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2023-11-23 20:39:42,007 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2023-11-23 20:39:42,008 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) [2023-11-23 20:39:42,011 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 33 transitions. [2023-11-23 20:39:42,013 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 33 transitions. Word has length 9 [2023-11-23 20:39:42,013 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:39:42,013 INFO L495 AbstractCegarLoop]: Abstraction has 26 states and 33 transitions. [2023-11-23 20:39:42,013 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) [2023-11-23 20:39:42,014 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 33 transitions. [2023-11-23 20:39:42,015 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2023-11-23 20:39:42,015 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:39:42,016 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 20:39:42,016 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-23 20:39:42,016 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 20:39:42,017 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:39:42,017 INFO L85 PathProgramCache]: Analyzing trace with hash 1524884472, now seen corresponding path program 1 times [2023-11-23 20:39:42,018 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:39:42,018 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1853223689] [2023-11-23 20:39:42,018 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:39:42,018 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:39:42,033 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:39:42,104 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 20:39:42,104 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:39:42,105 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1853223689] [2023-11-23 20:39:42,105 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1853223689] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 20:39:42,105 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 20:39:42,105 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-11-23 20:39:42,106 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [899057962] [2023-11-23 20:39:42,106 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 20:39:42,107 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-23 20:39:42,107 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:39:42,108 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-23 20:39:42,109 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-11-23 20:39:42,109 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) [2023-11-23 20:39:42,175 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:39:42,175 INFO L93 Difference]: Finished difference Result 32 states and 40 transitions. [2023-11-23 20:39:42,176 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-11-23 20:39:42,176 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 [2023-11-23 20:39:42,176 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:39:42,178 INFO L225 Difference]: With dead ends: 32 [2023-11-23 20:39:42,178 INFO L226 Difference]: Without dead ends: 28 [2023-11-23 20:39:42,179 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 [2023-11-23 20:39:42,181 INFO L413 NwaCegarLoop]: 22 mSDtfsCounter, 10 mSDsluCounter, 48 mSDsCounter, 0 mSdLazyCounter, 33 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 70 SdHoareTripleChecker+Invalid, 34 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 33 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-23 20:39:42,182 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [13 Valid, 70 Invalid, 34 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 33 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-23 20:39:42,183 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2023-11-23 20:39:42,190 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 26. [2023-11-23 20:39:42,191 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) [2023-11-23 20:39:42,192 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 33 transitions. [2023-11-23 20:39:42,193 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 33 transitions. Word has length 10 [2023-11-23 20:39:42,193 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:39:42,193 INFO L495 AbstractCegarLoop]: Abstraction has 26 states and 33 transitions. [2023-11-23 20:39:42,194 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) [2023-11-23 20:39:42,194 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 33 transitions. [2023-11-23 20:39:42,195 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2023-11-23 20:39:42,195 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:39:42,196 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 20:39:42,196 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-11-23 20:39:42,196 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 20:39:42,197 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:39:42,197 INFO L85 PathProgramCache]: Analyzing trace with hash 741502751, now seen corresponding path program 1 times [2023-11-23 20:39:42,198 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:39:42,198 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2116900649] [2023-11-23 20:39:42,198 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:39:42,199 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:39:42,221 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:39:42,355 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-23 20:39:42,356 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:39:42,356 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2116900649] [2023-11-23 20:39:42,356 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2116900649] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 20:39:42,357 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1365398324] [2023-11-23 20:39:42,357 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:39:42,357 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 20:39:42,357 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98125d69-4d63-40cd-9481-f0d7d69944d1/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 20:39:42,360 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98125d69-4d63-40cd-9481-f0d7d69944d1/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 20:39:42,370 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98125d69-4d63-40cd-9481-f0d7d69944d1/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-23 20:39:42,425 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:39:42,427 INFO L262 TraceCheckSpWp]: Trace formula consists of 70 conjuncts, 6 conjunts are in the unsatisfiable core [2023-11-23 20:39:42,433 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 20:39:42,558 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-23 20:39:42,558 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 20:39:42,919 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-23 20:39:42,920 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1365398324] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-23 20:39:42,920 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [992135362] [2023-11-23 20:39:42,942 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2023-11-23 20:39:42,942 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 20:39:42,946 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-23 20:39:42,952 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-23 20:39:42,953 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-23 20:39:43,055 INFO L197 IcfgInterpreter]: Interpreting procedure fibo1 with input of size 35 for LOIs [2023-11-23 20:39:43,123 INFO L197 IcfgInterpreter]: Interpreting procedure fibo2 with input of size 35 for LOIs [2023-11-23 20:39:43,134 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-23 20:39:43,449 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSifa [992135362] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 20:39:43,449 INFO L185 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2023-11-23 20:39:43,450 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [6, 7, 7] total 17 [2023-11-23 20:39:43,451 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1438253946] [2023-11-23 20:39:43,451 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 20:39:43,451 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-11-23 20:39:43,452 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:39:43,453 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-11-23 20:39:43,453 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=224, Unknown=0, NotChecked=0, Total=272 [2023-11-23 20:39:43,454 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) [2023-11-23 20:39:43,613 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:39:43,613 INFO L93 Difference]: Finished difference Result 68 states and 91 transitions. [2023-11-23 20:39:43,614 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-11-23 20:39:43,614 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 [2023-11-23 20:39:43,614 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:39:43,616 INFO L225 Difference]: With dead ends: 68 [2023-11-23 20:39:43,616 INFO L226 Difference]: Without dead ends: 44 [2023-11-23 20:39:43,617 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 54 SyntacticMatches, 2 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 43 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=48, Invalid=224, Unknown=0, NotChecked=0, Total=272 [2023-11-23 20:39:43,619 INFO L413 NwaCegarLoop]: 28 mSDtfsCounter, 16 mSDsluCounter, 73 mSDsCounter, 0 mSdLazyCounter, 68 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 21 SdHoareTripleChecker+Valid, 101 SdHoareTripleChecker+Invalid, 73 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 68 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 20:39:43,619 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [21 Valid, 101 Invalid, 73 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 68 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 20:39:43,621 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2023-11-23 20:39:43,631 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 42. [2023-11-23 20:39:43,632 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) [2023-11-23 20:39:43,633 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 50 transitions. [2023-11-23 20:39:43,634 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 50 transitions. Word has length 22 [2023-11-23 20:39:43,634 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:39:43,634 INFO L495 AbstractCegarLoop]: Abstraction has 42 states and 50 transitions. [2023-11-23 20:39:43,635 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) [2023-11-23 20:39:43,635 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 50 transitions. [2023-11-23 20:39:43,637 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2023-11-23 20:39:43,637 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:39:43,637 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] [2023-11-23 20:39:43,664 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98125d69-4d63-40cd-9481-f0d7d69944d1/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2023-11-23 20:39:43,857 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98125d69-4d63-40cd-9481-f0d7d69944d1/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2023-11-23 20:39:43,858 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 20:39:43,858 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:39:43,859 INFO L85 PathProgramCache]: Analyzing trace with hash -1754399412, now seen corresponding path program 1 times [2023-11-23 20:39:43,859 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:39:43,859 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [488371745] [2023-11-23 20:39:43,859 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:39:43,860 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:39:43,884 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:39:44,013 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 5 proven. 5 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-11-23 20:39:44,013 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:39:44,013 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [488371745] [2023-11-23 20:39:44,014 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [488371745] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 20:39:44,016 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1265733655] [2023-11-23 20:39:44,017 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:39:44,018 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 20:39:44,020 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98125d69-4d63-40cd-9481-f0d7d69944d1/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 20:39:44,021 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98125d69-4d63-40cd-9481-f0d7d69944d1/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 20:39:44,041 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98125d69-4d63-40cd-9481-f0d7d69944d1/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-23 20:39:44,080 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:39:44,082 INFO L262 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 8 conjunts are in the unsatisfiable core [2023-11-23 20:39:44,091 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 20:39:44,173 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2023-11-23 20:39:44,173 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 20:39:44,600 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 2 proven. 10 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-11-23 20:39:44,601 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1265733655] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-23 20:39:44,601 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [871390952] [2023-11-23 20:39:44,604 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2023-11-23 20:39:44,605 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 20:39:44,606 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:96) 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:267) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:148) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:167) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:150) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:127) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:233) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:227) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:144) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:106) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:319) 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) [2023-11-23 20:39:44,609 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-23 20:39:44,609 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 8, 9] total 14 [2023-11-23 20:39:44,610 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1691665119] [2023-11-23 20:39:44,610 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-23 20:39:44,611 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2023-11-23 20:39:44,611 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:39:44,612 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2023-11-23 20:39:44,613 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2023-11-23 20:39:44,613 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) [2023-11-23 20:39:44,847 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:39:44,848 INFO L93 Difference]: Finished difference Result 85 states and 121 transitions. [2023-11-23 20:39:44,848 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2023-11-23 20:39:44,849 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 [2023-11-23 20:39:44,849 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:39:44,851 INFO L225 Difference]: With dead ends: 85 [2023-11-23 20:39:44,852 INFO L226 Difference]: Without dead ends: 53 [2023-11-23 20:39:44,853 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 [2023-11-23 20:39:44,854 INFO L413 NwaCegarLoop]: 18 mSDtfsCounter, 39 mSDsluCounter, 83 mSDsCounter, 0 mSdLazyCounter, 122 mSolverCounterSat, 25 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 44 SdHoareTripleChecker+Valid, 101 SdHoareTripleChecker+Invalid, 147 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 25 IncrementalHoareTripleChecker+Valid, 122 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 20:39:44,855 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [44 Valid, 101 Invalid, 147 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [25 Valid, 122 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 20:39:44,856 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2023-11-23 20:39:44,868 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 44. [2023-11-23 20:39:44,869 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) [2023-11-23 20:39:44,870 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 53 transitions. [2023-11-23 20:39:44,871 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 53 transitions. Word has length 35 [2023-11-23 20:39:44,871 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:39:44,871 INFO L495 AbstractCegarLoop]: Abstraction has 44 states and 53 transitions. [2023-11-23 20:39:44,872 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) [2023-11-23 20:39:44,872 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 53 transitions. [2023-11-23 20:39:44,874 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2023-11-23 20:39:44,874 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:39:44,874 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] [2023-11-23 20:39:44,902 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98125d69-4d63-40cd-9481-f0d7d69944d1/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-11-23 20:39:45,075 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98125d69-4d63-40cd-9481-f0d7d69944d1/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 20:39:45,075 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 20:39:45,076 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:39:45,076 INFO L85 PathProgramCache]: Analyzing trace with hash 2101254926, now seen corresponding path program 1 times [2023-11-23 20:39:45,076 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:39:45,076 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2138765616] [2023-11-23 20:39:45,076 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:39:45,076 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:39:45,093 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:39:45,309 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 4 proven. 3 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-11-23 20:39:45,309 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:39:45,309 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2138765616] [2023-11-23 20:39:45,310 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2138765616] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 20:39:45,310 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1691905206] [2023-11-23 20:39:45,310 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:39:45,310 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 20:39:45,310 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98125d69-4d63-40cd-9481-f0d7d69944d1/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 20:39:45,312 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98125d69-4d63-40cd-9481-f0d7d69944d1/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 20:39:45,339 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98125d69-4d63-40cd-9481-f0d7d69944d1/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-23 20:39:45,370 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:39:45,371 INFO L262 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 8 conjunts are in the unsatisfiable core [2023-11-23 20:39:45,374 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 20:39:45,476 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-11-23 20:39:45,477 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 20:39:45,876 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 2 proven. 11 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-11-23 20:39:45,877 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1691905206] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-23 20:39:45,877 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [480465616] [2023-11-23 20:39:45,883 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2023-11-23 20:39:45,883 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 20:39:45,884 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:96) 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:267) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:148) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:167) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:150) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:127) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:233) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:227) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:144) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:106) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:319) 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) [2023-11-23 20:39:45,886 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-23 20:39:45,886 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8, 9] total 18 [2023-11-23 20:39:45,892 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [4728677] [2023-11-23 20:39:45,892 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-23 20:39:45,893 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2023-11-23 20:39:45,893 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:39:45,895 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2023-11-23 20:39:45,895 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=257, Unknown=0, NotChecked=0, Total=306 [2023-11-23 20:39:45,895 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) [2023-11-23 20:39:46,438 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:39:46,439 INFO L93 Difference]: Finished difference Result 121 states and 203 transitions. [2023-11-23 20:39:46,440 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2023-11-23 20:39:46,440 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 [2023-11-23 20:39:46,441 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:39:46,443 INFO L225 Difference]: With dead ends: 121 [2023-11-23 20:39:46,444 INFO L226 Difference]: Without dead ends: 77 [2023-11-23 20:39:46,446 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 68 SyntacticMatches, 3 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 126 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=142, Invalid=670, Unknown=0, NotChecked=0, Total=812 [2023-11-23 20:39:46,447 INFO L413 NwaCegarLoop]: 28 mSDtfsCounter, 54 mSDsluCounter, 209 mSDsCounter, 0 mSdLazyCounter, 378 mSolverCounterSat, 47 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 58 SdHoareTripleChecker+Valid, 237 SdHoareTripleChecker+Invalid, 425 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 47 IncrementalHoareTripleChecker+Valid, 378 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-11-23 20:39:46,448 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [58 Valid, 237 Invalid, 425 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [47 Valid, 378 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-11-23 20:39:46,448 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2023-11-23 20:39:46,468 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 63. [2023-11-23 20:39:46,468 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) [2023-11-23 20:39:46,471 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 91 transitions. [2023-11-23 20:39:46,471 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 91 transitions. Word has length 36 [2023-11-23 20:39:46,471 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:39:46,472 INFO L495 AbstractCegarLoop]: Abstraction has 63 states and 91 transitions. [2023-11-23 20:39:46,472 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) [2023-11-23 20:39:46,472 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 91 transitions. [2023-11-23 20:39:46,476 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2023-11-23 20:39:46,476 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:39:46,476 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] [2023-11-23 20:39:46,503 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98125d69-4d63-40cd-9481-f0d7d69944d1/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-11-23 20:39:46,695 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98125d69-4d63-40cd-9481-f0d7d69944d1/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 20:39:46,695 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 20:39:46,695 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:39:46,696 INFO L85 PathProgramCache]: Analyzing trace with hash 644290867, now seen corresponding path program 1 times [2023-11-23 20:39:46,696 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:39:46,696 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2004258580] [2023-11-23 20:39:46,696 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:39:46,696 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:39:46,718 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:39:46,901 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 12 proven. 12 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2023-11-23 20:39:46,901 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:39:46,902 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2004258580] [2023-11-23 20:39:46,902 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2004258580] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 20:39:46,902 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1001789779] [2023-11-23 20:39:46,902 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:39:46,902 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 20:39:46,903 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98125d69-4d63-40cd-9481-f0d7d69944d1/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 20:39:46,904 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98125d69-4d63-40cd-9481-f0d7d69944d1/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 20:39:46,949 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98125d69-4d63-40cd-9481-f0d7d69944d1/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-11-23 20:39:47,032 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:39:47,033 INFO L262 TraceCheckSpWp]: Trace formula consists of 132 conjuncts, 10 conjunts are in the unsatisfiable core [2023-11-23 20:39:47,036 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 20:39:47,132 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 4 proven. 23 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2023-11-23 20:39:47,132 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 20:39:47,705 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 4 proven. 28 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-11-23 20:39:47,705 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1001789779] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-23 20:39:47,706 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [226218419] [2023-11-23 20:39:47,708 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2023-11-23 20:39:47,709 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 20:39:47,709 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:96) 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:267) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:148) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:167) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:150) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:127) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:233) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:227) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:144) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:106) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:319) 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) [2023-11-23 20:39:47,710 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-23 20:39:47,710 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9, 11] total 17 [2023-11-23 20:39:47,711 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2058110025] [2023-11-23 20:39:47,711 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-23 20:39:47,712 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2023-11-23 20:39:47,712 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:39:47,713 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2023-11-23 20:39:47,713 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2023-11-23 20:39:47,713 INFO L87 Difference]: Start difference. First operand 63 states and 91 transitions. Second operand has 17 states, 15 states have (on average 3.6) internal successors, (54), 17 states have internal predecessors, (54), 12 states have call successors, (14), 1 states have call predecessors, (14), 8 states have return successors, (18), 8 states have call predecessors, (18), 12 states have call successors, (18) [2023-11-23 20:39:47,937 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:39:47,937 INFO L93 Difference]: Finished difference Result 119 states and 203 transitions. [2023-11-23 20:39:47,938 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2023-11-23 20:39:47,938 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 [2023-11-23 20:39:47,939 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:39:47,941 INFO L225 Difference]: With dead ends: 119 [2023-11-23 20:39:47,941 INFO L226 Difference]: Without dead ends: 97 [2023-11-23 20:39:47,943 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 117 GetRequests, 91 SyntacticMatches, 4 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 108 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=115, Invalid=437, Unknown=0, NotChecked=0, Total=552 [2023-11-23 20:39:47,944 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 37 mSDsluCounter, 103 mSDsCounter, 0 mSdLazyCounter, 122 mSolverCounterSat, 34 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 50 SdHoareTripleChecker+Valid, 119 SdHoareTripleChecker+Invalid, 156 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 34 IncrementalHoareTripleChecker+Valid, 122 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 20:39:47,944 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [50 Valid, 119 Invalid, 156 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [34 Valid, 122 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 20:39:47,945 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2023-11-23 20:39:47,964 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 72. [2023-11-23 20:39:47,964 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) [2023-11-23 20:39:47,967 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 105 transitions. [2023-11-23 20:39:47,967 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 105 transitions. Word has length 50 [2023-11-23 20:39:47,967 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:39:47,968 INFO L495 AbstractCegarLoop]: Abstraction has 72 states and 105 transitions. [2023-11-23 20:39:47,968 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) [2023-11-23 20:39:47,968 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 105 transitions. [2023-11-23 20:39:47,973 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2023-11-23 20:39:47,973 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:39:47,973 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] [2023-11-23 20:39:47,999 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98125d69-4d63-40cd-9481-f0d7d69944d1/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-11-23 20:39:48,189 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98125d69-4d63-40cd-9481-f0d7d69944d1/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2023-11-23 20:39:48,189 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 20:39:48,190 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:39:48,190 INFO L85 PathProgramCache]: Analyzing trace with hash 1646169427, now seen corresponding path program 1 times [2023-11-23 20:39:48,190 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:39:48,190 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1885685561] [2023-11-23 20:39:48,191 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:39:48,191 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:39:48,213 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:39:48,400 INFO L134 CoverageAnalysis]: Checked inductivity of 145 backedges. 39 proven. 42 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2023-11-23 20:39:48,401 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:39:48,401 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1885685561] [2023-11-23 20:39:48,401 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1885685561] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 20:39:48,401 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1494926619] [2023-11-23 20:39:48,402 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:39:48,402 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 20:39:48,402 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98125d69-4d63-40cd-9481-f0d7d69944d1/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 20:39:48,403 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98125d69-4d63-40cd-9481-f0d7d69944d1/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 20:39:48,425 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98125d69-4d63-40cd-9481-f0d7d69944d1/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-11-23 20:39:48,504 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:39:48,506 INFO L262 TraceCheckSpWp]: Trace formula consists of 196 conjuncts, 12 conjunts are in the unsatisfiable core [2023-11-23 20:39:48,516 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 20:39:48,672 INFO L134 CoverageAnalysis]: Checked inductivity of 145 backedges. 12 proven. 71 refuted. 0 times theorem prover too weak. 62 trivial. 0 not checked. [2023-11-23 20:39:48,672 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 20:39:49,712 INFO L134 CoverageAnalysis]: Checked inductivity of 145 backedges. 12 proven. 81 refuted. 0 times theorem prover too weak. 52 trivial. 0 not checked. [2023-11-23 20:39:49,713 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1494926619] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-23 20:39:49,713 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [405143369] [2023-11-23 20:39:49,716 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2023-11-23 20:39:49,716 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 20:39:49,717 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:96) 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:267) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:148) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:167) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:150) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:127) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:233) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:227) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:144) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:106) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:319) 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) [2023-11-23 20:39:49,718 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-23 20:39:49,718 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10, 13] total 23 [2023-11-23 20:39:49,719 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [644382714] [2023-11-23 20:39:49,719 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-23 20:39:49,720 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2023-11-23 20:39:49,720 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:39:49,721 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2023-11-23 20:39:49,722 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=439, Unknown=0, NotChecked=0, Total=506 [2023-11-23 20:39:49,726 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) [2023-11-23 20:39:50,460 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:39:50,460 INFO L93 Difference]: Finished difference Result 204 states and 411 transitions. [2023-11-23 20:39:50,461 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2023-11-23 20:39:50,461 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 [2023-11-23 20:39:50,462 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:39:50,465 INFO L225 Difference]: With dead ends: 204 [2023-11-23 20:39:50,465 INFO L226 Difference]: Without dead ends: 115 [2023-11-23 20:39:50,467 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 190 GetRequests, 147 SyntacticMatches, 5 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 252 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=263, Invalid=1297, Unknown=0, NotChecked=0, Total=1560 [2023-11-23 20:39:50,468 INFO L413 NwaCegarLoop]: 35 mSDtfsCounter, 89 mSDsluCounter, 302 mSDsCounter, 0 mSdLazyCounter, 535 mSolverCounterSat, 93 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 90 SdHoareTripleChecker+Valid, 337 SdHoareTripleChecker+Invalid, 628 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 93 IncrementalHoareTripleChecker+Valid, 535 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-11-23 20:39:50,469 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [90 Valid, 337 Invalid, 628 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [93 Valid, 535 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-11-23 20:39:50,470 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 115 states. [2023-11-23 20:39:50,488 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 115 to 98. [2023-11-23 20:39:50,491 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) [2023-11-23 20:39:50,494 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 144 transitions. [2023-11-23 20:39:50,497 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 144 transitions. Word has length 79 [2023-11-23 20:39:50,497 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:39:50,499 INFO L495 AbstractCegarLoop]: Abstraction has 98 states and 144 transitions. [2023-11-23 20:39:50,500 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) [2023-11-23 20:39:50,500 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 144 transitions. [2023-11-23 20:39:50,509 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 155 [2023-11-23 20:39:50,515 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:39:50,516 INFO L195 NwaCegarLoop]: trace histogram [14, 14, 9, 9, 8, 7, 7, 7, 7, 7, 7, 7, 7, 6, 4, 4, 4, 4, 4, 4, 4, 2, 2, 1, 1, 1, 1, 1, 1] [2023-11-23 20:39:50,537 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98125d69-4d63-40cd-9481-f0d7d69944d1/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-11-23 20:39:50,729 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98125d69-4d63-40cd-9481-f0d7d69944d1/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2023-11-23 20:39:50,730 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 20:39:50,730 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:39:50,730 INFO L85 PathProgramCache]: Analyzing trace with hash -1224818675, now seen corresponding path program 2 times [2023-11-23 20:39:50,730 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:39:50,730 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2075008856] [2023-11-23 20:39:50,730 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:39:50,731 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:39:50,761 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:39:50,901 INFO L134 CoverageAnalysis]: Checked inductivity of 652 backedges. 40 proven. 139 refuted. 0 times theorem prover too weak. 473 trivial. 0 not checked. [2023-11-23 20:39:50,901 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:39:50,902 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2075008856] [2023-11-23 20:39:50,902 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2075008856] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 20:39:50,902 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2114073963] [2023-11-23 20:39:50,902 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-23 20:39:50,902 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 20:39:50,903 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98125d69-4d63-40cd-9481-f0d7d69944d1/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 20:39:50,904 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98125d69-4d63-40cd-9481-f0d7d69944d1/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 20:39:50,927 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98125d69-4d63-40cd-9481-f0d7d69944d1/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-11-23 20:39:50,989 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2023-11-23 20:39:50,990 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-23 20:39:50,990 INFO L262 TraceCheckSpWp]: Trace formula consists of 98 conjuncts, 5 conjunts are in the unsatisfiable core [2023-11-23 20:39:50,994 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 20:39:51,026 INFO L134 CoverageAnalysis]: Checked inductivity of 652 backedges. 173 proven. 0 refuted. 0 times theorem prover too weak. 479 trivial. 0 not checked. [2023-11-23 20:39:51,026 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-23 20:39:51,026 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2114073963] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 20:39:51,027 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-23 20:39:51,027 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [6] total 6 [2023-11-23 20:39:51,027 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1669525687] [2023-11-23 20:39:51,027 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 20:39:51,028 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-11-23 20:39:51,028 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:39:51,029 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-11-23 20:39:51,029 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2023-11-23 20:39:51,029 INFO L87 Difference]: Start difference. First operand 98 states and 144 transitions. Second operand has 6 states, 5 states have (on average 6.2) internal successors, (31), 6 states have internal predecessors, (31), 3 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (9), 2 states have call predecessors, (9), 3 states have call successors, (9) [2023-11-23 20:39:51,083 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:39:51,083 INFO L93 Difference]: Finished difference Result 188 states and 309 transitions. [2023-11-23 20:39:51,084 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-23 20:39:51,084 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 6.2) internal successors, (31), 6 states have internal predecessors, (31), 3 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (9), 2 states have call predecessors, (9), 3 states have call successors, (9) Word has length 154 [2023-11-23 20:39:51,085 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:39:51,086 INFO L225 Difference]: With dead ends: 188 [2023-11-23 20:39:51,086 INFO L226 Difference]: Without dead ends: 100 [2023-11-23 20:39:51,087 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 161 GetRequests, 154 SyntacticMatches, 2 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2023-11-23 20:39:51,088 INFO L413 NwaCegarLoop]: 26 mSDtfsCounter, 15 mSDsluCounter, 53 mSDsCounter, 0 mSdLazyCounter, 41 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 79 SdHoareTripleChecker+Invalid, 44 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 41 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-23 20:39:51,089 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [20 Valid, 79 Invalid, 44 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 41 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-23 20:39:51,090 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2023-11-23 20:39:51,103 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 100. [2023-11-23 20:39:51,104 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) [2023-11-23 20:39:51,105 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 143 transitions. [2023-11-23 20:39:51,106 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 143 transitions. Word has length 154 [2023-11-23 20:39:51,106 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:39:51,106 INFO L495 AbstractCegarLoop]: Abstraction has 100 states and 143 transitions. [2023-11-23 20:39:51,106 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 6.2) internal successors, (31), 6 states have internal predecessors, (31), 3 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (9), 2 states have call predecessors, (9), 3 states have call successors, (9) [2023-11-23 20:39:51,107 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 143 transitions. [2023-11-23 20:39:51,109 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 133 [2023-11-23 20:39:51,109 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:39:51,110 INFO L195 NwaCegarLoop]: trace histogram [10, 10, 9, 9, 8, 7, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1] [2023-11-23 20:39:51,137 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98125d69-4d63-40cd-9481-f0d7d69944d1/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2023-11-23 20:39:51,325 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98125d69-4d63-40cd-9481-f0d7d69944d1/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 20:39:51,326 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 20:39:51,326 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:39:51,326 INFO L85 PathProgramCache]: Analyzing trace with hash -147830407, now seen corresponding path program 1 times [2023-11-23 20:39:51,326 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:39:51,326 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1514699800] [2023-11-23 20:39:51,326 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:39:51,327 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:39:51,354 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:39:51,640 INFO L134 CoverageAnalysis]: Checked inductivity of 437 backedges. 42 proven. 136 refuted. 0 times theorem prover too weak. 259 trivial. 0 not checked. [2023-11-23 20:39:51,640 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:39:51,641 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1514699800] [2023-11-23 20:39:51,641 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1514699800] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 20:39:51,641 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2016004531] [2023-11-23 20:39:51,641 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:39:51,642 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 20:39:51,642 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98125d69-4d63-40cd-9481-f0d7d69944d1/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 20:39:51,643 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98125d69-4d63-40cd-9481-f0d7d69944d1/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 20:39:51,665 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98125d69-4d63-40cd-9481-f0d7d69944d1/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-11-23 20:39:51,756 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:39:51,757 INFO L262 TraceCheckSpWp]: Trace formula consists of 314 conjuncts, 14 conjunts are in the unsatisfiable core [2023-11-23 20:39:51,765 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 20:39:51,890 INFO L134 CoverageAnalysis]: Checked inductivity of 437 backedges. 29 proven. 179 refuted. 0 times theorem prover too weak. 229 trivial. 0 not checked. [2023-11-23 20:39:51,890 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 20:39:53,300 INFO L134 CoverageAnalysis]: Checked inductivity of 437 backedges. 29 proven. 195 refuted. 0 times theorem prover too weak. 213 trivial. 0 not checked. [2023-11-23 20:39:53,301 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2016004531] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-23 20:39:53,301 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1470042288] [2023-11-23 20:39:53,304 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2023-11-23 20:39:53,304 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 20:39:53,304 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:96) 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:267) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:148) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:167) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:150) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:127) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:233) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:227) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:144) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:106) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:319) 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) [2023-11-23 20:39:53,305 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-23 20:39:53,305 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 11, 15] total 23 [2023-11-23 20:39:53,306 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1492401679] [2023-11-23 20:39:53,306 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-23 20:39:53,307 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2023-11-23 20:39:53,307 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:39:53,308 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2023-11-23 20:39:53,308 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=410, Unknown=0, NotChecked=0, Total=506 [2023-11-23 20:39:53,308 INFO L87 Difference]: Start difference. First operand 100 states and 143 transitions. Second operand has 23 states, 21 states have (on average 3.619047619047619) internal successors, (76), 23 states have internal predecessors, (76), 18 states have call successors, (22), 1 states have call predecessors, (22), 12 states have return successors, (30), 12 states have call predecessors, (30), 18 states have call successors, (30) [2023-11-23 20:39:53,622 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:39:53,622 INFO L93 Difference]: Finished difference Result 159 states and 286 transitions. [2023-11-23 20:39:53,623 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2023-11-23 20:39:53,623 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 21 states have (on average 3.619047619047619) internal successors, (76), 23 states have internal predecessors, (76), 18 states have call successors, (22), 1 states have call predecessors, (22), 12 states have return successors, (30), 12 states have call predecessors, (30), 18 states have call successors, (30) Word has length 132 [2023-11-23 20:39:53,624 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:39:53,626 INFO L225 Difference]: With dead ends: 159 [2023-11-23 20:39:53,626 INFO L226 Difference]: Without dead ends: 135 [2023-11-23 20:39:53,628 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 286 GetRequests, 248 SyntacticMatches, 6 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 313 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=223, Invalid=899, Unknown=0, NotChecked=0, Total=1122 [2023-11-23 20:39:53,629 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 68 mSDsluCounter, 156 mSDsCounter, 0 mSdLazyCounter, 187 mSolverCounterSat, 75 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 82 SdHoareTripleChecker+Valid, 172 SdHoareTripleChecker+Invalid, 262 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 75 IncrementalHoareTripleChecker+Valid, 187 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-23 20:39:53,629 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [82 Valid, 172 Invalid, 262 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [75 Valid, 187 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-23 20:39:53,630 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 135 states. [2023-11-23 20:39:53,649 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 135 to 118. [2023-11-23 20:39:53,650 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 118 states, 76 states have (on average 1.144736842105263) internal successors, (87), 79 states have internal predecessors, (87), 22 states have call successors, (22), 8 states have call predecessors, (22), 19 states have return successors, (69), 30 states have call predecessors, (69), 22 states have call successors, (69) [2023-11-23 20:39:53,652 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 118 states to 118 states and 178 transitions. [2023-11-23 20:39:53,652 INFO L78 Accepts]: Start accepts. Automaton has 118 states and 178 transitions. Word has length 132 [2023-11-23 20:39:53,652 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:39:53,653 INFO L495 AbstractCegarLoop]: Abstraction has 118 states and 178 transitions. [2023-11-23 20:39:53,657 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 21 states have (on average 3.619047619047619) internal successors, (76), 23 states have internal predecessors, (76), 18 states have call successors, (22), 1 states have call predecessors, (22), 12 states have return successors, (30), 12 states have call predecessors, (30), 18 states have call successors, (30) [2023-11-23 20:39:53,657 INFO L276 IsEmpty]: Start isEmpty. Operand 118 states and 178 transitions. [2023-11-23 20:39:53,666 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 365 [2023-11-23 20:39:53,666 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:39:53,666 INFO L195 NwaCegarLoop]: trace histogram [28, 28, 25, 25, 22, 21, 14, 14, 14, 14, 14, 14, 14, 12, 12, 12, 12, 12, 12, 12, 10, 7, 6, 4, 1, 1, 1, 1, 1, 1] [2023-11-23 20:39:53,687 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98125d69-4d63-40cd-9481-f0d7d69944d1/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2023-11-23 20:39:53,879 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98125d69-4d63-40cd-9481-f0d7d69944d1/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2023-11-23 20:39:53,879 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 20:39:53,880 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:39:53,880 INFO L85 PathProgramCache]: Analyzing trace with hash 556538190, now seen corresponding path program 2 times [2023-11-23 20:39:53,880 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:39:53,881 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1353094279] [2023-11-23 20:39:53,881 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:39:53,881 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:39:53,948 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:39:54,646 INFO L134 CoverageAnalysis]: Checked inductivity of 3781 backedges. 119 proven. 759 refuted. 0 times theorem prover too weak. 2903 trivial. 0 not checked. [2023-11-23 20:39:54,647 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:39:54,647 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1353094279] [2023-11-23 20:39:54,647 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1353094279] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 20:39:54,647 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [236445697] [2023-11-23 20:39:54,647 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-23 20:39:54,648 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 20:39:54,648 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98125d69-4d63-40cd-9481-f0d7d69944d1/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 20:39:54,650 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98125d69-4d63-40cd-9481-f0d7d69944d1/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 20:39:54,658 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98125d69-4d63-40cd-9481-f0d7d69944d1/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-11-23 20:39:54,786 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2023-11-23 20:39:54,786 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-23 20:39:54,788 INFO L262 TraceCheckSpWp]: Trace formula consists of 224 conjuncts, 10 conjunts are in the unsatisfiable core [2023-11-23 20:39:54,796 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 20:39:54,948 INFO L134 CoverageAnalysis]: Checked inductivity of 3781 backedges. 653 proven. 20 refuted. 0 times theorem prover too weak. 3108 trivial. 0 not checked. [2023-11-23 20:39:54,948 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 20:39:56,210 INFO L134 CoverageAnalysis]: Checked inductivity of 3781 backedges. 653 proven. 21 refuted. 0 times theorem prover too weak. 3107 trivial. 0 not checked. [2023-11-23 20:39:56,210 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [236445697] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-23 20:39:56,211 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [470260888] [2023-11-23 20:39:56,213 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2023-11-23 20:39:56,213 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 20:39:56,214 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:96) 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:267) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:148) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:167) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:150) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:127) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:233) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:227) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:144) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:106) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:319) 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) [2023-11-23 20:39:56,215 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-23 20:39:56,215 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 10, 11] total 25 [2023-11-23 20:39:56,216 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1310519923] [2023-11-23 20:39:56,216 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-23 20:39:56,217 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2023-11-23 20:39:56,218 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:39:56,218 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2023-11-23 20:39:56,219 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=526, Unknown=0, NotChecked=0, Total=600 [2023-11-23 20:39:56,219 INFO L87 Difference]: Start difference. First operand 118 states and 178 transitions. Second operand has 25 states, 24 states have (on average 3.5) internal successors, (84), 25 states have internal predecessors, (84), 17 states have call successors, (23), 1 states have call predecessors, (23), 14 states have return successors, (31), 15 states have call predecessors, (31), 17 states have call successors, (31) [2023-11-23 20:39:57,403 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:39:57,404 INFO L93 Difference]: Finished difference Result 308 states and 616 transitions. [2023-11-23 20:39:57,404 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2023-11-23 20:39:57,405 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 24 states have (on average 3.5) internal successors, (84), 25 states have internal predecessors, (84), 17 states have call successors, (23), 1 states have call predecessors, (23), 14 states have return successors, (31), 15 states have call predecessors, (31), 17 states have call successors, (31) Word has length 364 [2023-11-23 20:39:57,406 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:39:57,410 INFO L225 Difference]: With dead ends: 308 [2023-11-23 20:39:57,411 INFO L226 Difference]: Without dead ends: 185 [2023-11-23 20:39:57,415 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 772 GetRequests, 717 SyntacticMatches, 3 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 573 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=416, Invalid=2446, Unknown=0, NotChecked=0, Total=2862 [2023-11-23 20:39:57,416 INFO L413 NwaCegarLoop]: 37 mSDtfsCounter, 138 mSDsluCounter, 406 mSDsCounter, 0 mSdLazyCounter, 859 mSolverCounterSat, 148 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 139 SdHoareTripleChecker+Valid, 443 SdHoareTripleChecker+Invalid, 1007 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 148 IncrementalHoareTripleChecker+Valid, 859 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2023-11-23 20:39:57,417 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [139 Valid, 443 Invalid, 1007 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [148 Valid, 859 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2023-11-23 20:39:57,419 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 185 states. [2023-11-23 20:39:57,446 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 185 to 165. [2023-11-23 20:39:57,446 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 165 states, 112 states have (on average 1.125) internal successors, (126), 112 states have internal predecessors, (126), 31 states have call successors, (31), 19 states have call predecessors, (31), 21 states have return successors, (108), 33 states have call predecessors, (108), 31 states have call successors, (108) [2023-11-23 20:39:57,449 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 165 states to 165 states and 265 transitions. [2023-11-23 20:39:57,450 INFO L78 Accepts]: Start accepts. Automaton has 165 states and 265 transitions. Word has length 364 [2023-11-23 20:39:57,450 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:39:57,451 INFO L495 AbstractCegarLoop]: Abstraction has 165 states and 265 transitions. [2023-11-23 20:39:57,451 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 24 states have (on average 3.5) internal successors, (84), 25 states have internal predecessors, (84), 17 states have call successors, (23), 1 states have call predecessors, (23), 14 states have return successors, (31), 15 states have call predecessors, (31), 17 states have call successors, (31) [2023-11-23 20:39:57,451 INFO L276 IsEmpty]: Start isEmpty. Operand 165 states and 265 transitions. [2023-11-23 20:39:57,460 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 363 [2023-11-23 20:39:57,460 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:39:57,461 INFO L195 NwaCegarLoop]: trace histogram [28, 28, 25, 25, 21, 20, 14, 14, 14, 14, 14, 14, 14, 12, 12, 12, 12, 12, 12, 12, 9, 7, 6, 5, 1, 1, 1, 1, 1, 1] [2023-11-23 20:39:57,488 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98125d69-4d63-40cd-9481-f0d7d69944d1/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2023-11-23 20:39:57,673 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98125d69-4d63-40cd-9481-f0d7d69944d1/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2023-11-23 20:39:57,673 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 20:39:57,674 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:39:57,674 INFO L85 PathProgramCache]: Analyzing trace with hash -1962324482, now seen corresponding path program 3 times [2023-11-23 20:39:57,674 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:39:57,674 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1766979171] [2023-11-23 20:39:57,674 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:39:57,674 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:39:57,773 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:39:58,421 INFO L134 CoverageAnalysis]: Checked inductivity of 3740 backedges. 193 proven. 571 refuted. 0 times theorem prover too weak. 2976 trivial. 0 not checked. [2023-11-23 20:39:58,421 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:39:58,421 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1766979171] [2023-11-23 20:39:58,422 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1766979171] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 20:39:58,422 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [806281362] [2023-11-23 20:39:58,422 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-11-23 20:39:58,422 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 20:39:58,422 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98125d69-4d63-40cd-9481-f0d7d69944d1/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 20:39:58,423 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98125d69-4d63-40cd-9481-f0d7d69944d1/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 20:39:58,446 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98125d69-4d63-40cd-9481-f0d7d69944d1/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2023-11-23 20:39:58,606 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-11-23 20:39:58,607 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-23 20:39:58,609 INFO L262 TraceCheckSpWp]: Trace formula consists of 643 conjuncts, 14 conjunts are in the unsatisfiable core [2023-11-23 20:39:58,618 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 20:39:58,769 INFO L134 CoverageAnalysis]: Checked inductivity of 3740 backedges. 1582 proven. 68 refuted. 0 times theorem prover too weak. 2090 trivial. 0 not checked. [2023-11-23 20:39:58,770 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 20:40:00,839 INFO L134 CoverageAnalysis]: Checked inductivity of 3740 backedges. 230 proven. 792 refuted. 0 times theorem prover too weak. 2718 trivial. 0 not checked. [2023-11-23 20:40:00,839 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [806281362] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-23 20:40:00,839 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [624420077] [2023-11-23 20:40:00,844 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2023-11-23 20:40:00,844 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 20:40:00,845 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:96) 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:267) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:148) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:167) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:150) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:127) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:233) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:227) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:144) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:106) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:319) 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) [2023-11-23 20:40:00,847 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-23 20:40:00,847 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 13, 15] total 24 [2023-11-23 20:40:00,848 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1716747471] [2023-11-23 20:40:00,848 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-23 20:40:00,850 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2023-11-23 20:40:00,850 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:40:00,851 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2023-11-23 20:40:00,851 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=484, Unknown=0, NotChecked=0, Total=552 [2023-11-23 20:40:00,852 INFO L87 Difference]: Start difference. First operand 165 states and 265 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) [2023-11-23 20:40:01,705 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:40:01,705 INFO L93 Difference]: Finished difference Result 381 states and 753 transitions. [2023-11-23 20:40:01,705 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2023-11-23 20:40:01,706 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 362 [2023-11-23 20:40:01,706 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:40:01,711 INFO L225 Difference]: With dead ends: 381 [2023-11-23 20:40:01,712 INFO L226 Difference]: Without dead ends: 226 [2023-11-23 20:40:01,715 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 761 GetRequests, 708 SyntacticMatches, 7 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 430 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=359, Invalid=1897, Unknown=0, NotChecked=0, Total=2256 [2023-11-23 20:40:01,716 INFO L413 NwaCegarLoop]: 30 mSDtfsCounter, 125 mSDsluCounter, 305 mSDsCounter, 0 mSdLazyCounter, 671 mSolverCounterSat, 104 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 126 SdHoareTripleChecker+Valid, 335 SdHoareTripleChecker+Invalid, 775 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 104 IncrementalHoareTripleChecker+Valid, 671 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-11-23 20:40:01,717 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [126 Valid, 335 Invalid, 775 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [104 Valid, 671 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-11-23 20:40:01,718 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 226 states. [2023-11-23 20:40:01,739 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 226 to 180. [2023-11-23 20:40:01,740 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 180 states, 123 states have (on average 1.113821138211382) internal successors, (137), 123 states have internal predecessors, (137), 34 states have call successors, (34), 22 states have call predecessors, (34), 22 states have return successors, (123), 34 states have call predecessors, (123), 34 states have call successors, (123) [2023-11-23 20:40:01,742 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 180 states to 180 states and 294 transitions. [2023-11-23 20:40:01,744 INFO L78 Accepts]: Start accepts. Automaton has 180 states and 294 transitions. Word has length 362 [2023-11-23 20:40:01,745 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:40:01,745 INFO L495 AbstractCegarLoop]: Abstraction has 180 states and 294 transitions. [2023-11-23 20:40:01,746 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) [2023-11-23 20:40:01,746 INFO L276 IsEmpty]: Start isEmpty. Operand 180 states and 294 transitions. [2023-11-23 20:40:01,754 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 406 [2023-11-23 20:40:01,754 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:40:01,755 INFO L195 NwaCegarLoop]: trace histogram [30, 30, 29, 29, 24, 24, 15, 15, 15, 15, 15, 15, 15, 14, 14, 14, 14, 14, 14, 14, 10, 9, 6, 5, 1, 1, 1, 1, 1, 1] [2023-11-23 20:40:01,780 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98125d69-4d63-40cd-9481-f0d7d69944d1/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2023-11-23 20:40:01,980 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98125d69-4d63-40cd-9481-f0d7d69944d1/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 20:40:01,980 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 20:40:01,980 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:40:01,980 INFO L85 PathProgramCache]: Analyzing trace with hash 1172898535, now seen corresponding path program 4 times [2023-11-23 20:40:01,980 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:40:01,980 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1163510827] [2023-11-23 20:40:01,981 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:40:01,981 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:40:02,089 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:40:02,619 INFO L134 CoverageAnalysis]: Checked inductivity of 4700 backedges. 266 proven. 601 refuted. 0 times theorem prover too weak. 3833 trivial. 0 not checked. [2023-11-23 20:40:02,619 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:40:02,619 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1163510827] [2023-11-23 20:40:02,619 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1163510827] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 20:40:02,620 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1855208148] [2023-11-23 20:40:02,620 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-11-23 20:40:02,620 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 20:40:02,620 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98125d69-4d63-40cd-9481-f0d7d69944d1/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 20:40:02,621 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98125d69-4d63-40cd-9481-f0d7d69944d1/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 20:40:02,655 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98125d69-4d63-40cd-9481-f0d7d69944d1/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2023-11-23 20:40:02,897 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:40:02,901 INFO L262 TraceCheckSpWp]: Trace formula consists of 920 conjuncts, 18 conjunts are in the unsatisfiable core [2023-11-23 20:40:02,912 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 20:40:03,071 INFO L134 CoverageAnalysis]: Checked inductivity of 4700 backedges. 155 proven. 976 refuted. 0 times theorem prover too weak. 3569 trivial. 0 not checked. [2023-11-23 20:40:03,072 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 20:40:06,397 INFO L134 CoverageAnalysis]: Checked inductivity of 4700 backedges. 155 proven. 1009 refuted. 0 times theorem prover too weak. 3536 trivial. 0 not checked. [2023-11-23 20:40:06,397 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1855208148] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-23 20:40:06,398 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1901432099] [2023-11-23 20:40:06,400 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2023-11-23 20:40:06,400 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 20:40:06,401 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:96) 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:267) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:148) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:167) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:150) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:127) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:233) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:227) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:144) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:106) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:319) 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) [2023-11-23 20:40:06,402 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-23 20:40:06,402 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 13, 19] total 25 [2023-11-23 20:40:06,403 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1327501966] [2023-11-23 20:40:06,403 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-23 20:40:06,404 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2023-11-23 20:40:06,404 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:40:06,405 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2023-11-23 20:40:06,405 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=495, Unknown=0, NotChecked=0, Total=600 [2023-11-23 20:40:06,406 INFO L87 Difference]: Start difference. First operand 180 states and 294 transitions. Second operand has 25 states, 23 states have (on average 3.608695652173913) internal successors, (83), 25 states have internal predecessors, (83), 21 states have call successors, (25), 1 states have call predecessors, (25), 12 states have return successors, (34), 13 states have call predecessors, (34), 21 states have call successors, (34) [2023-11-23 20:40:06,770 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:40:06,770 INFO L93 Difference]: Finished difference Result 245 states and 487 transitions. [2023-11-23 20:40:06,770 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2023-11-23 20:40:06,771 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 23 states have (on average 3.608695652173913) internal successors, (83), 25 states have internal predecessors, (83), 21 states have call successors, (25), 1 states have call predecessors, (25), 12 states have return successors, (34), 13 states have call predecessors, (34), 21 states have call successors, (34) Word has length 405 [2023-11-23 20:40:06,772 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:40:06,776 INFO L225 Difference]: With dead ends: 245 [2023-11-23 20:40:06,776 INFO L226 Difference]: Without dead ends: 221 [2023-11-23 20:40:06,778 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 834 GetRequests, 792 SyntacticMatches, 8 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 352 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=243, Invalid=1017, Unknown=0, NotChecked=0, Total=1260 [2023-11-23 20:40:06,779 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 54 mSDsluCounter, 189 mSDsCounter, 0 mSdLazyCounter, 224 mSolverCounterSat, 47 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 71 SdHoareTripleChecker+Valid, 205 SdHoareTripleChecker+Invalid, 271 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 47 IncrementalHoareTripleChecker+Valid, 224 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-23 20:40:06,779 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [71 Valid, 205 Invalid, 271 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [47 Valid, 224 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-23 20:40:06,780 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 221 states. [2023-11-23 20:40:06,808 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 221 to 187. [2023-11-23 20:40:06,809 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 187 states, 127 states have (on average 1.110236220472441) internal successors, (141), 127 states have internal predecessors, (141), 36 states have call successors, (36), 22 states have call predecessors, (36), 23 states have return successors, (127), 37 states have call predecessors, (127), 36 states have call successors, (127) [2023-11-23 20:40:06,812 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 187 states to 187 states and 304 transitions. [2023-11-23 20:40:06,813 INFO L78 Accepts]: Start accepts. Automaton has 187 states and 304 transitions. Word has length 405 [2023-11-23 20:40:06,813 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:40:06,813 INFO L495 AbstractCegarLoop]: Abstraction has 187 states and 304 transitions. [2023-11-23 20:40:06,814 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 23 states have (on average 3.608695652173913) internal successors, (83), 25 states have internal predecessors, (83), 21 states have call successors, (25), 1 states have call predecessors, (25), 12 states have return successors, (34), 13 states have call predecessors, (34), 21 states have call successors, (34) [2023-11-23 20:40:06,814 INFO L276 IsEmpty]: Start isEmpty. Operand 187 states and 304 transitions. [2023-11-23 20:40:06,903 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1066 [2023-11-23 20:40:06,903 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:40:06,904 INFO L195 NwaCegarLoop]: trace histogram [79, 79, 78, 78, 65, 55, 39, 39, 39, 39, 39, 39, 39, 39, 39, 39, 39, 39, 39, 39, 26, 24, 16, 13, 1, 1, 1, 1, 1, 1] [2023-11-23 20:40:06,931 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98125d69-4d63-40cd-9481-f0d7d69944d1/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2023-11-23 20:40:07,125 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98125d69-4d63-40cd-9481-f0d7d69944d1/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 20:40:07,125 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 20:40:07,126 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:40:07,126 INFO L85 PathProgramCache]: Analyzing trace with hash -339920052, now seen corresponding path program 5 times [2023-11-23 20:40:07,126 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:40:07,126 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [187220858] [2023-11-23 20:40:07,127 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:40:07,127 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:40:07,358 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:40:09,263 INFO L134 CoverageAnalysis]: Checked inductivity of 33829 backedges. 472 proven. 2345 refuted. 0 times theorem prover too weak. 31012 trivial. 0 not checked. [2023-11-23 20:40:09,264 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:40:09,264 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [187220858] [2023-11-23 20:40:09,264 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [187220858] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 20:40:09,264 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [470121482] [2023-11-23 20:40:09,265 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-23 20:40:09,265 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 20:40:09,265 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98125d69-4d63-40cd-9481-f0d7d69944d1/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 20:40:09,270 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98125d69-4d63-40cd-9481-f0d7d69944d1/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 20:40:09,293 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98125d69-4d63-40cd-9481-f0d7d69944d1/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2023-11-23 20:40:09,524 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2023-11-23 20:40:09,524 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-23 20:40:09,526 INFO L262 TraceCheckSpWp]: Trace formula consists of 234 conjuncts, 8 conjunts are in the unsatisfiable core [2023-11-23 20:40:09,546 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 20:40:09,664 INFO L134 CoverageAnalysis]: Checked inductivity of 33829 backedges. 4157 proven. 6 refuted. 0 times theorem prover too weak. 29666 trivial. 0 not checked. [2023-11-23 20:40:09,664 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 20:40:12,541 INFO L134 CoverageAnalysis]: Checked inductivity of 33829 backedges. 2163 proven. 54 refuted. 0 times theorem prover too weak. 31612 trivial. 0 not checked. [2023-11-23 20:40:12,542 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [470121482] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-23 20:40:12,542 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1940758919] [2023-11-23 20:40:12,550 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2023-11-23 20:40:12,551 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 20:40:12,551 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:96) 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:267) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:148) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:167) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:150) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:127) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:233) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:227) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:144) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:106) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:319) 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) [2023-11-23 20:40:12,553 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-23 20:40:12,554 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 9, 9] total 20 [2023-11-23 20:40:12,554 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [435021826] [2023-11-23 20:40:12,554 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-23 20:40:12,557 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2023-11-23 20:40:12,557 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:40:12,558 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2023-11-23 20:40:12,559 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=328, Unknown=0, NotChecked=0, Total=380 [2023-11-23 20:40:12,559 INFO L87 Difference]: Start difference. First operand 187 states and 304 transitions. Second operand has 20 states, 19 states have (on average 4.2105263157894735) internal successors, (80), 20 states have internal predecessors, (80), 13 states have call successors, (23), 2 states have call predecessors, (23), 11 states have return successors, (31), 12 states have call predecessors, (31), 13 states have call successors, (31) [2023-11-23 20:40:13,196 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:40:13,196 INFO L93 Difference]: Finished difference Result 457 states and 955 transitions. [2023-11-23 20:40:13,197 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2023-11-23 20:40:13,197 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 19 states have (on average 4.2105263157894735) internal successors, (80), 20 states have internal predecessors, (80), 13 states have call successors, (23), 2 states have call predecessors, (23), 11 states have return successors, (31), 12 states have call predecessors, (31), 13 states have call successors, (31) Word has length 1065 [2023-11-23 20:40:13,197 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:40:13,202 INFO L225 Difference]: With dead ends: 457 [2023-11-23 20:40:13,203 INFO L226 Difference]: Without dead ends: 270 [2023-11-23 20:40:13,206 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2164 GetRequests, 2123 SyntacticMatches, 4 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 226 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=255, Invalid=1227, Unknown=0, NotChecked=0, Total=1482 [2023-11-23 20:40:13,207 INFO L413 NwaCegarLoop]: 24 mSDtfsCounter, 109 mSDsluCounter, 203 mSDsCounter, 0 mSdLazyCounter, 461 mSolverCounterSat, 102 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 110 SdHoareTripleChecker+Valid, 227 SdHoareTripleChecker+Invalid, 563 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 102 IncrementalHoareTripleChecker+Valid, 461 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-11-23 20:40:13,208 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [110 Valid, 227 Invalid, 563 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [102 Valid, 461 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-11-23 20:40:13,209 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 270 states. [2023-11-23 20:40:13,284 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 270 to 262. [2023-11-23 20:40:13,285 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 262 states, 179 states have (on average 1.106145251396648) internal successors, (198), 177 states have internal predecessors, (198), 52 states have call successors, (52), 33 states have call predecessors, (52), 30 states have return successors, (237), 51 states have call predecessors, (237), 52 states have call successors, (237) [2023-11-23 20:40:13,290 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 262 states to 262 states and 487 transitions. [2023-11-23 20:40:13,291 INFO L78 Accepts]: Start accepts. Automaton has 262 states and 487 transitions. Word has length 1065 [2023-11-23 20:40:13,292 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:40:13,292 INFO L495 AbstractCegarLoop]: Abstraction has 262 states and 487 transitions. [2023-11-23 20:40:13,292 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 19 states have (on average 4.2105263157894735) internal successors, (80), 20 states have internal predecessors, (80), 13 states have call successors, (23), 2 states have call predecessors, (23), 11 states have return successors, (31), 12 states have call predecessors, (31), 13 states have call successors, (31) [2023-11-23 20:40:13,293 INFO L276 IsEmpty]: Start isEmpty. Operand 262 states and 487 transitions. [2023-11-23 20:40:13,302 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 835 [2023-11-23 20:40:13,303 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:40:13,303 INFO L195 NwaCegarLoop]: trace histogram [61, 61, 60, 60, 56, 49, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 26, 19, 11, 5, 1, 1, 1, 1, 1, 1] [2023-11-23 20:40:13,328 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98125d69-4d63-40cd-9481-f0d7d69944d1/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2023-11-23 20:40:13,521 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98125d69-4d63-40cd-9481-f0d7d69944d1/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 20:40:13,521 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 20:40:13,522 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:40:13,522 INFO L85 PathProgramCache]: Analyzing trace with hash -35739822, now seen corresponding path program 6 times [2023-11-23 20:40:13,522 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:40:13,522 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1416542842] [2023-11-23 20:40:13,522 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:40:13,522 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:40:13,721 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:40:15,029 INFO L134 CoverageAnalysis]: Checked inductivity of 20596 backedges. 460 proven. 1767 refuted. 0 times theorem prover too weak. 18369 trivial. 0 not checked. [2023-11-23 20:40:15,030 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:40:15,030 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1416542842] [2023-11-23 20:40:15,030 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1416542842] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 20:40:15,030 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [552666778] [2023-11-23 20:40:15,030 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-11-23 20:40:15,031 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 20:40:15,031 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98125d69-4d63-40cd-9481-f0d7d69944d1/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 20:40:15,032 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98125d69-4d63-40cd-9481-f0d7d69944d1/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 20:40:15,046 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98125d69-4d63-40cd-9481-f0d7d69944d1/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2023-11-23 20:40:15,404 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-11-23 20:40:15,404 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-23 20:40:15,410 INFO L262 TraceCheckSpWp]: Trace formula consists of 1485 conjuncts, 18 conjunts are in the unsatisfiable core [2023-11-23 20:40:15,429 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 20:40:15,696 INFO L134 CoverageAnalysis]: Checked inductivity of 20596 backedges. 6413 proven. 181 refuted. 0 times theorem prover too weak. 14002 trivial. 0 not checked. [2023-11-23 20:40:15,696 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 20:40:19,705 INFO L134 CoverageAnalysis]: Checked inductivity of 20596 backedges. 510 proven. 2698 refuted. 0 times theorem prover too weak. 17388 trivial. 0 not checked. [2023-11-23 20:40:19,706 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [552666778] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-23 20:40:19,706 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1924627777] [2023-11-23 20:40:19,708 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2023-11-23 20:40:19,709 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 20:40:19,709 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:96) 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:267) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:148) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:167) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:150) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:127) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:233) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:227) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:144) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:106) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:319) 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) [2023-11-23 20:40:19,710 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-23 20:40:19,711 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 15, 19] total 28 [2023-11-23 20:40:19,711 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1379467225] [2023-11-23 20:40:19,712 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-23 20:40:19,714 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2023-11-23 20:40:19,714 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:40:19,715 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2023-11-23 20:40:19,716 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=88, Invalid=668, Unknown=0, NotChecked=0, Total=756 [2023-11-23 20:40:19,716 INFO L87 Difference]: Start difference. First operand 262 states and 487 transitions. Second operand has 28 states, 27 states have (on average 4.0) internal successors, (108), 28 states have internal predecessors, (108), 23 states have call successors, (33), 2 states have call predecessors, (33), 14 states have return successors, (42), 14 states have call predecessors, (42), 23 states have call successors, (42) [2023-11-23 20:40:20,944 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:40:20,944 INFO L93 Difference]: Finished difference Result 673 states and 1636 transitions. [2023-11-23 20:40:20,944 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2023-11-23 20:40:20,945 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 27 states have (on average 4.0) internal successors, (108), 28 states have internal predecessors, (108), 23 states have call successors, (33), 2 states have call predecessors, (33), 14 states have return successors, (42), 14 states have call predecessors, (42), 23 states have call successors, (42) Word has length 834 [2023-11-23 20:40:20,945 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:40:20,955 INFO L225 Difference]: With dead ends: 673 [2023-11-23 20:40:20,955 INFO L226 Difference]: Without dead ends: 424 [2023-11-23 20:40:20,962 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1714 GetRequests, 1648 SyntacticMatches, 9 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 739 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=521, Invalid=2901, Unknown=0, NotChecked=0, Total=3422 [2023-11-23 20:40:20,963 INFO L413 NwaCegarLoop]: 36 mSDtfsCounter, 133 mSDsluCounter, 408 mSDsCounter, 0 mSdLazyCounter, 961 mSolverCounterSat, 127 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 134 SdHoareTripleChecker+Valid, 444 SdHoareTripleChecker+Invalid, 1088 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 127 IncrementalHoareTripleChecker+Valid, 961 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2023-11-23 20:40:20,963 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [134 Valid, 444 Invalid, 1088 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [127 Valid, 961 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2023-11-23 20:40:20,965 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 424 states. [2023-11-23 20:40:21,012 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 424 to 395. [2023-11-23 20:40:21,014 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 395 states, 277 states have (on average 1.0974729241877257) internal successors, (304), 266 states have internal predecessors, (304), 80 states have call successors, (80), 61 states have call predecessors, (80), 37 states have return successors, (410), 67 states have call predecessors, (410), 80 states have call successors, (410) [2023-11-23 20:40:21,020 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 395 states to 395 states and 794 transitions. [2023-11-23 20:40:21,021 INFO L78 Accepts]: Start accepts. Automaton has 395 states and 794 transitions. Word has length 834 [2023-11-23 20:40:21,022 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:40:21,022 INFO L495 AbstractCegarLoop]: Abstraction has 395 states and 794 transitions. [2023-11-23 20:40:21,022 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 27 states have (on average 4.0) internal successors, (108), 28 states have internal predecessors, (108), 23 states have call successors, (33), 2 states have call predecessors, (33), 14 states have return successors, (42), 14 states have call predecessors, (42), 23 states have call successors, (42) [2023-11-23 20:40:21,023 INFO L276 IsEmpty]: Start isEmpty. Operand 395 states and 794 transitions. [2023-11-23 20:40:21,036 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 841 [2023-11-23 20:40:21,036 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:40:21,036 INFO L195 NwaCegarLoop]: trace histogram [64, 64, 59, 59, 50, 49, 32, 32, 32, 32, 32, 32, 32, 29, 29, 29, 29, 29, 29, 29, 21, 17, 14, 10, 1, 1, 1, 1, 1, 1] [2023-11-23 20:40:21,061 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98125d69-4d63-40cd-9481-f0d7d69944d1/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2023-11-23 20:40:21,255 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13,13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98125d69-4d63-40cd-9481-f0d7d69944d1/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 20:40:21,256 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 20:40:21,256 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:40:21,256 INFO L85 PathProgramCache]: Analyzing trace with hash 845125939, now seen corresponding path program 7 times [2023-11-23 20:40:21,257 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:40:21,257 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1537057471] [2023-11-23 20:40:21,257 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:40:21,257 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:40:21,413 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:40:23,169 INFO L134 CoverageAnalysis]: Checked inductivity of 20917 backedges. 588 proven. 2560 refuted. 0 times theorem prover too weak. 17769 trivial. 0 not checked. [2023-11-23 20:40:23,169 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:40:23,170 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1537057471] [2023-11-23 20:40:23,170 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1537057471] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 20:40:23,170 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1909418777] [2023-11-23 20:40:23,170 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-11-23 20:40:23,170 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 20:40:23,171 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98125d69-4d63-40cd-9481-f0d7d69944d1/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 20:40:23,171 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98125d69-4d63-40cd-9481-f0d7d69944d1/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 20:40:23,186 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98125d69-4d63-40cd-9481-f0d7d69944d1/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2023-11-23 20:40:23,591 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:40:23,597 INFO L262 TraceCheckSpWp]: Trace formula consists of 1886 conjuncts, 20 conjunts are in the unsatisfiable core [2023-11-23 20:40:23,612 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 20:40:23,837 INFO L134 CoverageAnalysis]: Checked inductivity of 20917 backedges. 340 proven. 2510 refuted. 0 times theorem prover too weak. 18067 trivial. 0 not checked. [2023-11-23 20:40:23,837 INFO L327 TraceCheckSpWp]: Computing backward predicates...