./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/recursive-simple/fibo_5-2.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 9bd2c7ff Calling Ultimate with: /usr/lib/jvm/java-11-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_143da6bf-2527-4445-b8be-8b2840e4a2e7/bin/utaipan-verify-t7M7D8N6sZ/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_143da6bf-2527-4445-b8be-8b2840e4a2e7/bin/utaipan-verify-t7M7D8N6sZ/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_143da6bf-2527-4445-b8be-8b2840e4a2e7/bin/utaipan-verify-t7M7D8N6sZ/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_143da6bf-2527-4445-b8be-8b2840e4a2e7/bin/utaipan-verify-t7M7D8N6sZ/config/TaipanReach.xml -i ../../sv-benchmarks/c/recursive-simple/fibo_5-2.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_143da6bf-2527-4445-b8be-8b2840e4a2e7/bin/utaipan-verify-t7M7D8N6sZ/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_143da6bf-2527-4445-b8be-8b2840e4a2e7/bin/utaipan-verify-t7M7D8N6sZ --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 02dc726982da9e300f34803a4bdbb3c0165037d3f4471bd0e009c42cfb19ed24 --- Real Ultimate output --- This is Ultimate 0.2.3-dev-9bd2c7f [2023-11-19 04:10:00,983 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-19 04:10:01,094 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_143da6bf-2527-4445-b8be-8b2840e4a2e7/bin/utaipan-verify-t7M7D8N6sZ/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-11-19 04:10:01,104 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-19 04:10:01,105 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-19 04:10:01,136 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-19 04:10:01,137 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-19 04:10:01,137 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-19 04:10:01,138 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-19 04:10:01,138 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-19 04:10:01,139 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-19 04:10:01,140 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-19 04:10:01,140 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-19 04:10:01,141 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-19 04:10:01,141 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-19 04:10:01,142 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-19 04:10:01,142 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-19 04:10:01,143 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-19 04:10:01,143 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-19 04:10:01,144 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-19 04:10:01,144 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-19 04:10:01,145 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-19 04:10:01,146 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-19 04:10:01,146 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-11-19 04:10:01,147 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-19 04:10:01,147 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-19 04:10:01,148 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-19 04:10:01,148 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-19 04:10:01,149 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-11-19 04:10:01,149 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-19 04:10:01,150 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-11-19 04:10:01,150 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-19 04:10:01,150 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-11-19 04:10:01,151 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-19 04:10:01,151 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-19 04:10:01,152 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-19 04:10:01,152 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-19 04:10:01,153 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-19 04:10:01,153 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-19 04:10:01,154 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-11-19 04:10:01,154 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-19 04:10:01,155 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-19 04:10:01,155 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-11-19 04:10:01,156 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-19 04:10:01,156 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-19 04:10:01,157 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_143da6bf-2527-4445-b8be-8b2840e4a2e7/bin/utaipan-verify-t7M7D8N6sZ/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_143da6bf-2527-4445-b8be-8b2840e4a2e7/bin/utaipan-verify-t7M7D8N6sZ Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 02dc726982da9e300f34803a4bdbb3c0165037d3f4471bd0e009c42cfb19ed24 [2023-11-19 04:10:01,435 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-19 04:10:01,468 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-19 04:10:01,471 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-19 04:10:01,472 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-19 04:10:01,473 INFO L274 PluginConnector]: CDTParser initialized [2023-11-19 04:10:01,475 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_143da6bf-2527-4445-b8be-8b2840e4a2e7/bin/utaipan-verify-t7M7D8N6sZ/../../sv-benchmarks/c/recursive-simple/fibo_5-2.c [2023-11-19 04:10:04,678 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-19 04:10:04,891 INFO L384 CDTParser]: Found 1 translation units. [2023-11-19 04:10:04,892 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_143da6bf-2527-4445-b8be-8b2840e4a2e7/sv-benchmarks/c/recursive-simple/fibo_5-2.c [2023-11-19 04:10:04,900 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_143da6bf-2527-4445-b8be-8b2840e4a2e7/bin/utaipan-verify-t7M7D8N6sZ/data/53fdfdafa/78523587d8bb424fb6ba514369df69a0/FLAGe8c9a96e9 [2023-11-19 04:10:04,915 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_143da6bf-2527-4445-b8be-8b2840e4a2e7/bin/utaipan-verify-t7M7D8N6sZ/data/53fdfdafa/78523587d8bb424fb6ba514369df69a0 [2023-11-19 04:10:04,922 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-19 04:10:04,924 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-19 04:10:04,925 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-19 04:10:04,926 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-19 04:10:04,931 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-19 04:10:04,932 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 04:10:04" (1/1) ... [2023-11-19 04:10:04,933 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1bf48f68 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:10:04, skipping insertion in model container [2023-11-19 04:10:04,934 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 04:10:04" (1/1) ... [2023-11-19 04:10:04,957 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-19 04:10:05,146 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_143da6bf-2527-4445-b8be-8b2840e4a2e7/sv-benchmarks/c/recursive-simple/fibo_5-2.c[740,753] [2023-11-19 04:10:05,151 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-19 04:10:05,166 INFO L202 MainTranslator]: Completed pre-run [2023-11-19 04:10:05,179 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_143da6bf-2527-4445-b8be-8b2840e4a2e7/sv-benchmarks/c/recursive-simple/fibo_5-2.c[740,753] [2023-11-19 04:10:05,180 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-19 04:10:05,195 INFO L206 MainTranslator]: Completed translation [2023-11-19 04:10:05,195 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:10:05 WrapperNode [2023-11-19 04:10:05,196 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-19 04:10:05,197 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-19 04:10:05,197 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-19 04:10:05,198 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-19 04:10:05,206 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:10:05" (1/1) ... [2023-11-19 04:10:05,213 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:10:05" (1/1) ... [2023-11-19 04:10:05,234 INFO L138 Inliner]: procedures = 13, calls = 10, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 20 [2023-11-19 04:10:05,234 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-19 04:10:05,236 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-19 04:10:05,236 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-19 04:10:05,236 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-19 04:10:05,246 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:10:05" (1/1) ... [2023-11-19 04:10:05,246 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:10:05" (1/1) ... [2023-11-19 04:10:05,248 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:10:05" (1/1) ... [2023-11-19 04:10:05,248 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:10:05" (1/1) ... [2023-11-19 04:10:05,252 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:10:05" (1/1) ... [2023-11-19 04:10:05,254 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:10:05" (1/1) ... [2023-11-19 04:10:05,254 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:10:05" (1/1) ... [2023-11-19 04:10:05,255 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:10:05" (1/1) ... [2023-11-19 04:10:05,257 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-19 04:10:05,258 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-19 04:10:05,258 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-19 04:10:05,258 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-19 04:10:05,259 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:10:05" (1/1) ... [2023-11-19 04:10:05,265 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-19 04:10:05,283 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_143da6bf-2527-4445-b8be-8b2840e4a2e7/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 04:10:05,300 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_143da6bf-2527-4445-b8be-8b2840e4a2e7/bin/utaipan-verify-t7M7D8N6sZ/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-19 04:10:05,338 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_143da6bf-2527-4445-b8be-8b2840e4a2e7/bin/utaipan-verify-t7M7D8N6sZ/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-19 04:10:05,347 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-19 04:10:05,347 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-19 04:10:05,348 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-19 04:10:05,348 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-19 04:10:05,348 INFO L130 BoogieDeclarations]: Found specification of procedure fibo [2023-11-19 04:10:05,348 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo [2023-11-19 04:10:05,423 INFO L236 CfgBuilder]: Building ICFG [2023-11-19 04:10:05,425 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-19 04:10:05,525 INFO L277 CfgBuilder]: Performing block encoding [2023-11-19 04:10:05,544 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-19 04:10:05,551 INFO L302 CfgBuilder]: Removed 0 assume(true) statements. [2023-11-19 04:10:05,555 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 04:10:05 BoogieIcfgContainer [2023-11-19 04:10:05,556 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-19 04:10:05,558 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-19 04:10:05,559 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-19 04:10:05,562 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-19 04:10:05,562 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 19.11 04:10:04" (1/3) ... [2023-11-19 04:10:05,563 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@49474b6d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 04:10:05, skipping insertion in model container [2023-11-19 04:10:05,563 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:10:05" (2/3) ... [2023-11-19 04:10:05,564 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@49474b6d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 04:10:05, skipping insertion in model container [2023-11-19 04:10:05,564 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 04:10:05" (3/3) ... [2023-11-19 04:10:05,566 INFO L112 eAbstractionObserver]: Analyzing ICFG fibo_5-2.c [2023-11-19 04:10:05,586 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-19 04:10:05,587 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-11-19 04:10:05,638 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-19 04:10:05,646 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;@1ddbb200, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-19 04:10:05,647 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-11-19 04:10:05,651 INFO L276 IsEmpty]: Start isEmpty. Operand has 17 states, 11 states have (on average 1.3636363636363635) internal successors, (15), 12 states have internal predecessors, (15), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-19 04:10:05,657 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2023-11-19 04:10:05,657 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 04:10:05,658 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 04:10:05,659 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 04:10:05,664 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 04:10:05,665 INFO L85 PathProgramCache]: Analyzing trace with hash 1688587911, now seen corresponding path program 1 times [2023-11-19 04:10:05,676 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 04:10:05,676 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [148902327] [2023-11-19 04:10:05,677 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 04:10:05,677 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 04:10:05,819 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 04:10:06,013 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 04:10:06,014 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 04:10:06,014 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [148902327] [2023-11-19 04:10:06,015 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [148902327] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 04:10:06,015 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-19 04:10:06,016 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-11-19 04:10:06,017 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [803294767] [2023-11-19 04:10:06,018 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 04:10:06,023 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-19 04:10:06,023 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 04:10:06,053 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-19 04:10:06,054 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-11-19 04:10:06,057 INFO L87 Difference]: Start difference. First operand has 17 states, 11 states have (on average 1.3636363636363635) internal successors, (15), 12 states have internal predecessors, (15), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 5 states, 5 states have (on average 1.4) 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) [2023-11-19 04:10:06,107 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 04:10:06,107 INFO L93 Difference]: Finished difference Result 26 states and 32 transitions. [2023-11-19 04:10:06,109 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-11-19 04:10:06,110 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.4) 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 [2023-11-19 04:10:06,110 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 04:10:06,118 INFO L225 Difference]: With dead ends: 26 [2023-11-19 04:10:06,119 INFO L226 Difference]: Without dead ends: 17 [2023-11-19 04:10:06,121 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-11-19 04:10:06,125 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 1 mSDsluCounter, 44 mSDsCounter, 0 mSdLazyCounter, 19 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 60 SdHoareTripleChecker+Invalid, 19 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 19 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-19 04:10:06,127 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 60 Invalid, 19 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 19 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-19 04:10:06,144 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2023-11-19 04:10:06,161 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2023-11-19 04:10:06,163 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 11 states have (on average 1.1818181818181819) internal successors, (13), 12 states have internal predecessors, (13), 3 states have call successors, (3), 1 states have call predecessors, (3), 2 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) [2023-11-19 04:10:06,164 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 21 transitions. [2023-11-19 04:10:06,165 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 21 transitions. Word has length 9 [2023-11-19 04:10:06,166 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 04:10:06,166 INFO L495 AbstractCegarLoop]: Abstraction has 17 states and 21 transitions. [2023-11-19 04:10:06,166 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.4) 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) [2023-11-19 04:10:06,167 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 21 transitions. [2023-11-19 04:10:06,168 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2023-11-19 04:10:06,168 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 04:10:06,168 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 04:10:06,169 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-19 04:10:06,169 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 04:10:06,170 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 04:10:06,170 INFO L85 PathProgramCache]: Analyzing trace with hash 1521360425, now seen corresponding path program 1 times [2023-11-19 04:10:06,170 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 04:10:06,170 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2002924071] [2023-11-19 04:10:06,171 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 04:10:06,171 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 04:10:06,183 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 04:10:06,300 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 04:10:06,300 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 04:10:06,301 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2002924071] [2023-11-19 04:10:06,301 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2002924071] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 04:10:06,301 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-19 04:10:06,301 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-11-19 04:10:06,304 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2033134953] [2023-11-19 04:10:06,304 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 04:10:06,305 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-19 04:10:06,306 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 04:10:06,306 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-19 04:10:06,307 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-11-19 04:10:06,307 INFO L87 Difference]: Start difference. First operand 17 states and 21 transitions. Second operand has 5 states, 5 states have (on average 1.6) 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) [2023-11-19 04:10:06,339 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 04:10:06,339 INFO L93 Difference]: Finished difference Result 23 states and 28 transitions. [2023-11-19 04:10:06,340 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-11-19 04:10:06,340 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.6) 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 [2023-11-19 04:10:06,341 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 04:10:06,342 INFO L225 Difference]: With dead ends: 23 [2023-11-19 04:10:06,342 INFO L226 Difference]: Without dead ends: 19 [2023-11-19 04:10:06,343 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-11-19 04:10:06,344 INFO L413 NwaCegarLoop]: 19 mSDtfsCounter, 0 mSDsluCounter, 52 mSDsCounter, 0 mSdLazyCounter, 11 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 71 SdHoareTripleChecker+Invalid, 11 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 11 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-19 04:10:06,345 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 71 Invalid, 11 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 11 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-19 04:10:06,346 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2023-11-19 04:10:06,351 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 17. [2023-11-19 04:10:06,351 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 11 states have (on average 1.1818181818181819) internal successors, (13), 12 states have internal predecessors, (13), 3 states have call successors, (3), 1 states have call predecessors, (3), 2 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) [2023-11-19 04:10:06,352 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 21 transitions. [2023-11-19 04:10:06,353 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 21 transitions. Word has length 10 [2023-11-19 04:10:06,353 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 04:10:06,353 INFO L495 AbstractCegarLoop]: Abstraction has 17 states and 21 transitions. [2023-11-19 04:10:06,354 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.6) 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) [2023-11-19 04:10:06,354 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 21 transitions. [2023-11-19 04:10:06,355 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2023-11-19 04:10:06,355 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 04:10:06,356 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 04:10:06,356 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-11-19 04:10:06,356 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 04:10:06,357 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 04:10:06,357 INFO L85 PathProgramCache]: Analyzing trace with hash -1124411740, now seen corresponding path program 1 times [2023-11-19 04:10:06,357 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 04:10:06,358 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1929297659] [2023-11-19 04:10:06,358 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 04:10:06,358 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 04:10:06,398 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 04:10:06,524 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 5 proven. 3 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-11-19 04:10:06,525 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 04:10:06,525 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1929297659] [2023-11-19 04:10:06,525 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1929297659] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 04:10:06,526 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [381989157] [2023-11-19 04:10:06,526 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 04:10:06,526 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 04:10:06,526 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_143da6bf-2527-4445-b8be-8b2840e4a2e7/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 04:10:06,528 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_143da6bf-2527-4445-b8be-8b2840e4a2e7/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 04:10:06,549 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_143da6bf-2527-4445-b8be-8b2840e4a2e7/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-19 04:10:06,594 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 04:10:06,596 INFO L262 TraceCheckSpWp]: Trace formula consists of 71 conjuncts, 6 conjunts are in the unsatisfiable core [2023-11-19 04:10:06,602 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 04:10:06,686 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-11-19 04:10:06,687 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 04:10:06,961 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 7 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-11-19 04:10:06,964 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [381989157] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 04:10:06,966 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1096016052] [2023-11-19 04:10:06,997 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2023-11-19 04:10:06,998 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 04:10:07,009 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) [2023-11-19 04:10:07,015 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-19 04:10:07,016 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 7] total 11 [2023-11-19 04:10:07,016 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [788111639] [2023-11-19 04:10:07,016 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-19 04:10:07,021 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2023-11-19 04:10:07,024 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 04:10:07,025 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2023-11-19 04:10:07,026 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=80, Unknown=0, NotChecked=0, Total=110 [2023-11-19 04:10:07,026 INFO L87 Difference]: Start difference. First operand 17 states and 21 transitions. Second operand has 11 states, 8 states have (on average 3.375) internal successors, (27), 11 states have internal predecessors, (27), 8 states have call successors, (8), 1 states have call predecessors, (8), 4 states have return successors, (8), 2 states have call predecessors, (8), 8 states have call successors, (8) [2023-11-19 04:10:07,147 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 04:10:07,147 INFO L93 Difference]: Finished difference Result 34 states and 45 transitions. [2023-11-19 04:10:07,147 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-11-19 04:10:07,148 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 8 states have (on average 3.375) internal successors, (27), 11 states have internal predecessors, (27), 8 states have call successors, (8), 1 states have call predecessors, (8), 4 states have return successors, (8), 2 states have call predecessors, (8), 8 states have call successors, (8) Word has length 22 [2023-11-19 04:10:07,148 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 04:10:07,149 INFO L225 Difference]: With dead ends: 34 [2023-11-19 04:10:07,149 INFO L226 Difference]: Without dead ends: 19 [2023-11-19 04:10:07,151 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 40 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=59, Invalid=151, Unknown=0, NotChecked=0, Total=210 [2023-11-19 04:10:07,152 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 21 mSDsluCounter, 30 mSDsCounter, 0 mSdLazyCounter, 66 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 22 SdHoareTripleChecker+Valid, 42 SdHoareTripleChecker+Invalid, 82 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 66 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-19 04:10:07,153 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [22 Valid, 42 Invalid, 82 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 66 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-19 04:10:07,154 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2023-11-19 04:10:07,159 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2023-11-19 04:10:07,159 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 12 states have (on average 1.1666666666666667) internal successors, (14), 14 states have internal predecessors, (14), 3 states have call successors, (3), 1 states have call predecessors, (3), 3 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) [2023-11-19 04:10:07,160 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 23 transitions. [2023-11-19 04:10:07,161 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 23 transitions. Word has length 22 [2023-11-19 04:10:07,161 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 04:10:07,161 INFO L495 AbstractCegarLoop]: Abstraction has 19 states and 23 transitions. [2023-11-19 04:10:07,162 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 8 states have (on average 3.375) internal successors, (27), 11 states have internal predecessors, (27), 8 states have call successors, (8), 1 states have call predecessors, (8), 4 states have return successors, (8), 2 states have call predecessors, (8), 8 states have call successors, (8) [2023-11-19 04:10:07,162 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 23 transitions. [2023-11-19 04:10:07,163 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2023-11-19 04:10:07,163 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 04:10:07,164 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 04:10:07,189 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_143da6bf-2527-4445-b8be-8b2840e4a2e7/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-11-19 04:10:07,388 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_143da6bf-2527-4445-b8be-8b2840e4a2e7/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 04:10:07,388 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 04:10:07,389 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 04:10:07,389 INFO L85 PathProgramCache]: Analyzing trace with hash 992661418, now seen corresponding path program 1 times [2023-11-19 04:10:07,389 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 04:10:07,389 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [747281599] [2023-11-19 04:10:07,390 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 04:10:07,390 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 04:10:07,406 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 04:10:07,530 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2023-11-19 04:10:07,530 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 04:10:07,531 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [747281599] [2023-11-19 04:10:07,533 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [747281599] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 04:10:07,535 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [85596550] [2023-11-19 04:10:07,535 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 04:10:07,535 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 04:10:07,536 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_143da6bf-2527-4445-b8be-8b2840e4a2e7/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 04:10:07,539 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_143da6bf-2527-4445-b8be-8b2840e4a2e7/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 04:10:07,552 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_143da6bf-2527-4445-b8be-8b2840e4a2e7/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-19 04:10:07,587 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 04:10:07,588 INFO L262 TraceCheckSpWp]: Trace formula consists of 73 conjuncts, 6 conjunts are in the unsatisfiable core [2023-11-19 04:10:07,590 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 04:10:07,638 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2023-11-19 04:10:07,638 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 04:10:07,881 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 8 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-11-19 04:10:07,882 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [85596550] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 04:10:07,886 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [240022677] [2023-11-19 04:10:07,890 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2023-11-19 04:10:07,890 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 04:10:07,891 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java: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) [2023-11-19 04:10:07,892 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-19 04:10:07,892 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 7] total 9 [2023-11-19 04:10:07,892 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [403510221] [2023-11-19 04:10:07,893 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-19 04:10:07,894 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2023-11-19 04:10:07,894 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 04:10:07,895 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2023-11-19 04:10:07,895 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2023-11-19 04:10:07,896 INFO L87 Difference]: Start difference. First operand 19 states and 23 transitions. Second operand has 9 states, 7 states have (on average 3.142857142857143) internal successors, (22), 9 states have internal predecessors, (22), 5 states have call successors, (5), 1 states have call predecessors, (5), 3 states have return successors, (5), 2 states have call predecessors, (5), 5 states have call successors, (5) [2023-11-19 04:10:07,997 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 04:10:07,997 INFO L93 Difference]: Finished difference Result 28 states and 37 transitions. [2023-11-19 04:10:07,998 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-19 04:10:07,998 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 7 states have (on average 3.142857142857143) internal successors, (22), 9 states have internal predecessors, (22), 5 states have call successors, (5), 1 states have call predecessors, (5), 3 states have return successors, (5), 2 states have call predecessors, (5), 5 states have call successors, (5) Word has length 23 [2023-11-19 04:10:07,999 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 04:10:08,003 INFO L225 Difference]: With dead ends: 28 [2023-11-19 04:10:08,004 INFO L226 Difference]: Without dead ends: 24 [2023-11-19 04:10:08,006 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 44 SyntacticMatches, 2 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=74, Unknown=0, NotChecked=0, Total=110 [2023-11-19 04:10:08,009 INFO L413 NwaCegarLoop]: 10 mSDtfsCounter, 26 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 36 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 32 SdHoareTripleChecker+Valid, 27 SdHoareTripleChecker+Invalid, 51 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 36 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-19 04:10:08,011 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [32 Valid, 27 Invalid, 51 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 36 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-19 04:10:08,014 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2023-11-19 04:10:08,026 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2023-11-19 04:10:08,029 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 15 states have (on average 1.1333333333333333) internal successors, (17), 17 states have internal predecessors, (17), 4 states have call successors, (4), 1 states have call predecessors, (4), 4 states have return successors, (12), 5 states have call predecessors, (12), 4 states have call successors, (12) [2023-11-19 04:10:08,031 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 33 transitions. [2023-11-19 04:10:08,032 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 33 transitions. Word has length 23 [2023-11-19 04:10:08,032 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 04:10:08,032 INFO L495 AbstractCegarLoop]: Abstraction has 24 states and 33 transitions. [2023-11-19 04:10:08,033 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 7 states have (on average 3.142857142857143) internal successors, (22), 9 states have internal predecessors, (22), 5 states have call successors, (5), 1 states have call predecessors, (5), 3 states have return successors, (5), 2 states have call predecessors, (5), 5 states have call successors, (5) [2023-11-19 04:10:08,033 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 33 transitions. [2023-11-19 04:10:08,037 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2023-11-19 04:10:08,037 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 04:10:08,038 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 04:10:08,068 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_143da6bf-2527-4445-b8be-8b2840e4a2e7/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-11-19 04:10:08,250 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_143da6bf-2527-4445-b8be-8b2840e4a2e7/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 04:10:08,251 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 04:10:08,251 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 04:10:08,252 INFO L85 PathProgramCache]: Analyzing trace with hash 1950959585, now seen corresponding path program 2 times [2023-11-19 04:10:08,252 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 04:10:08,252 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [637416169] [2023-11-19 04:10:08,252 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 04:10:08,252 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 04:10:08,269 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 04:10:08,422 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 23 proven. 8 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2023-11-19 04:10:08,423 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 04:10:08,423 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [637416169] [2023-11-19 04:10:08,423 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [637416169] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 04:10:08,423 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [878948796] [2023-11-19 04:10:08,423 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-19 04:10:08,423 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 04:10:08,424 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_143da6bf-2527-4445-b8be-8b2840e4a2e7/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 04:10:08,425 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_143da6bf-2527-4445-b8be-8b2840e4a2e7/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 04:10:08,460 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_143da6bf-2527-4445-b8be-8b2840e4a2e7/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-19 04:10:08,490 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2023-11-19 04:10:08,491 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-19 04:10:08,491 INFO L262 TraceCheckSpWp]: Trace formula consists of 63 conjuncts, 6 conjunts are in the unsatisfiable core [2023-11-19 04:10:08,495 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 04:10:08,558 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 18 proven. 8 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2023-11-19 04:10:08,559 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 04:10:08,757 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 18 proven. 9 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2023-11-19 04:10:08,758 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [878948796] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 04:10:08,758 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [135420350] [2023-11-19 04:10:08,760 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2023-11-19 04:10:08,761 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 04:10:08,761 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) [2023-11-19 04:10:08,762 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-19 04:10:08,763 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 6, 7] total 14 [2023-11-19 04:10:08,763 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1726952297] [2023-11-19 04:10:08,763 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-19 04:10:08,764 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2023-11-19 04:10:08,764 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 04:10:08,765 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2023-11-19 04:10:08,765 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=142, Unknown=0, NotChecked=0, Total=182 [2023-11-19 04:10:08,765 INFO L87 Difference]: Start difference. First operand 24 states and 33 transitions. Second operand has 14 states, 12 states have (on average 3.0833333333333335) internal successors, (37), 14 states have internal predecessors, (37), 7 states have call successors, (12), 1 states have call predecessors, (12), 5 states have return successors, (13), 8 states have call predecessors, (13), 7 states have call successors, (13) [2023-11-19 04:10:08,982 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 04:10:08,982 INFO L93 Difference]: Finished difference Result 55 states and 85 transitions. [2023-11-19 04:10:08,987 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2023-11-19 04:10:08,987 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 12 states have (on average 3.0833333333333335) internal successors, (37), 14 states have internal predecessors, (37), 7 states have call successors, (12), 1 states have call predecessors, (12), 5 states have return successors, (13), 8 states have call predecessors, (13), 7 states have call successors, (13) Word has length 36 [2023-11-19 04:10:08,989 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 04:10:08,991 INFO L225 Difference]: With dead ends: 55 [2023-11-19 04:10:08,991 INFO L226 Difference]: Without dead ends: 33 [2023-11-19 04:10:08,993 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 65 SyntacticMatches, 2 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 56 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=111, Invalid=309, Unknown=0, NotChecked=0, Total=420 [2023-11-19 04:10:08,994 INFO L413 NwaCegarLoop]: 15 mSDtfsCounter, 26 mSDsluCounter, 49 mSDsCounter, 0 mSdLazyCounter, 108 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 27 SdHoareTripleChecker+Valid, 64 SdHoareTripleChecker+Invalid, 125 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 108 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-19 04:10:08,994 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [27 Valid, 64 Invalid, 125 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 108 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-19 04:10:08,995 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2023-11-19 04:10:09,011 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 27. [2023-11-19 04:10:09,012 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 18 states have (on average 1.1111111111111112) internal successors, (20), 19 states have internal predecessors, (20), 4 states have call successors, (4), 2 states have call predecessors, (4), 4 states have return successors, (11), 5 states have call predecessors, (11), 4 states have call successors, (11) [2023-11-19 04:10:09,013 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 35 transitions. [2023-11-19 04:10:09,015 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 35 transitions. Word has length 36 [2023-11-19 04:10:09,015 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 04:10:09,015 INFO L495 AbstractCegarLoop]: Abstraction has 27 states and 35 transitions. [2023-11-19 04:10:09,015 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 12 states have (on average 3.0833333333333335) internal successors, (37), 14 states have internal predecessors, (37), 7 states have call successors, (12), 1 states have call predecessors, (12), 5 states have return successors, (13), 8 states have call predecessors, (13), 7 states have call successors, (13) [2023-11-19 04:10:09,016 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 35 transitions. [2023-11-19 04:10:09,019 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2023-11-19 04:10:09,021 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 04:10:09,021 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 4, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 04:10:09,046 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_143da6bf-2527-4445-b8be-8b2840e4a2e7/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-11-19 04:10:09,221 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_143da6bf-2527-4445-b8be-8b2840e4a2e7/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 04:10:09,222 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 04:10:09,222 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 04:10:09,222 INFO L85 PathProgramCache]: Analyzing trace with hash -1865467761, now seen corresponding path program 3 times [2023-11-19 04:10:09,223 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 04:10:09,223 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1382895] [2023-11-19 04:10:09,223 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 04:10:09,223 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 04:10:09,236 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 04:10:09,348 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 6 proven. 24 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2023-11-19 04:10:09,348 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 04:10:09,348 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1382895] [2023-11-19 04:10:09,348 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1382895] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 04:10:09,349 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [748329681] [2023-11-19 04:10:09,349 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-11-19 04:10:09,349 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 04:10:09,349 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_143da6bf-2527-4445-b8be-8b2840e4a2e7/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 04:10:09,350 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_143da6bf-2527-4445-b8be-8b2840e4a2e7/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 04:10:09,355 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_143da6bf-2527-4445-b8be-8b2840e4a2e7/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-11-19 04:10:09,405 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-11-19 04:10:09,405 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-19 04:10:09,406 INFO L262 TraceCheckSpWp]: Trace formula consists of 104 conjuncts, 8 conjunts are in the unsatisfiable core [2023-11-19 04:10:09,408 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 04:10:09,448 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 6 proven. 24 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2023-11-19 04:10:09,449 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 04:10:09,823 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 6 proven. 31 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2023-11-19 04:10:09,823 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [748329681] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 04:10:09,823 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1088654622] [2023-11-19 04:10:09,828 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2023-11-19 04:10:09,828 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 04:10:09,829 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) [2023-11-19 04:10:09,829 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-19 04:10:09,829 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 9] total 11 [2023-11-19 04:10:09,830 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1678654499] [2023-11-19 04:10:09,830 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-19 04:10:09,831 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2023-11-19 04:10:09,831 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 04:10:09,832 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2023-11-19 04:10:09,832 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2023-11-19 04:10:09,833 INFO L87 Difference]: Start difference. First operand 27 states and 35 transitions. Second operand has 11 states, 9 states have (on average 3.3333333333333335) internal successors, (30), 11 states have internal predecessors, (30), 7 states have call successors, (7), 1 states have call predecessors, (7), 4 states have return successors, (8), 3 states have call predecessors, (8), 7 states have call successors, (8) [2023-11-19 04:10:09,930 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 04:10:09,930 INFO L93 Difference]: Finished difference Result 36 states and 50 transitions. [2023-11-19 04:10:09,930 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-11-19 04:10:09,931 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 9 states have (on average 3.3333333333333335) internal successors, (30), 11 states have internal predecessors, (30), 7 states have call successors, (7), 1 states have call predecessors, (7), 4 states have return successors, (8), 3 states have call predecessors, (8), 7 states have call successors, (8) Word has length 37 [2023-11-19 04:10:09,931 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 04:10:09,934 INFO L225 Difference]: With dead ends: 36 [2023-11-19 04:10:09,935 INFO L226 Difference]: Without dead ends: 32 [2023-11-19 04:10:09,935 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 71 SyntacticMatches, 3 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=59, Invalid=123, Unknown=0, NotChecked=0, Total=182 [2023-11-19 04:10:09,936 INFO L413 NwaCegarLoop]: 10 mSDtfsCounter, 15 mSDsluCounter, 40 mSDsCounter, 0 mSdLazyCounter, 75 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 23 SdHoareTripleChecker+Valid, 50 SdHoareTripleChecker+Invalid, 83 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 75 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-19 04:10:09,936 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [23 Valid, 50 Invalid, 83 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 75 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-19 04:10:09,937 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2023-11-19 04:10:09,952 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2023-11-19 04:10:09,953 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 21 states have (on average 1.0952380952380953) internal successors, (23), 22 states have internal predecessors, (23), 5 states have call successors, (5), 2 states have call predecessors, (5), 5 states have return successors, (18), 7 states have call predecessors, (18), 5 states have call successors, (18) [2023-11-19 04:10:09,955 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 46 transitions. [2023-11-19 04:10:09,955 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 46 transitions. Word has length 37 [2023-11-19 04:10:09,955 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 04:10:09,955 INFO L495 AbstractCegarLoop]: Abstraction has 32 states and 46 transitions. [2023-11-19 04:10:09,956 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 9 states have (on average 3.3333333333333335) internal successors, (30), 11 states have internal predecessors, (30), 7 states have call successors, (7), 1 states have call predecessors, (7), 4 states have return successors, (8), 3 states have call predecessors, (8), 7 states have call successors, (8) [2023-11-19 04:10:09,956 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 46 transitions. [2023-11-19 04:10:09,963 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2023-11-19 04:10:09,963 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 04:10:09,964 INFO L195 NwaCegarLoop]: trace histogram [13, 13, 11, 6, 6, 6, 6, 6, 6, 6, 5, 2, 1, 1, 1, 1, 1, 1] [2023-11-19 04:10:09,988 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_143da6bf-2527-4445-b8be-8b2840e4a2e7/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-11-19 04:10:10,179 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_143da6bf-2527-4445-b8be-8b2840e4a2e7/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 04:10:10,179 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 04:10:10,179 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 04:10:10,179 INFO L85 PathProgramCache]: Analyzing trace with hash -881380593, now seen corresponding path program 4 times [2023-11-19 04:10:10,179 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 04:10:10,180 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1807696816] [2023-11-19 04:10:10,180 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 04:10:10,180 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 04:10:10,213 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 04:10:10,439 INFO L134 CoverageAnalysis]: Checked inductivity of 427 backedges. 27 proven. 166 refuted. 0 times theorem prover too weak. 234 trivial. 0 not checked. [2023-11-19 04:10:10,439 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 04:10:10,440 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1807696816] [2023-11-19 04:10:10,440 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1807696816] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 04:10:10,440 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1572008842] [2023-11-19 04:10:10,440 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-11-19 04:10:10,440 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 04:10:10,440 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_143da6bf-2527-4445-b8be-8b2840e4a2e7/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 04:10:10,441 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_143da6bf-2527-4445-b8be-8b2840e4a2e7/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 04:10:10,465 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_143da6bf-2527-4445-b8be-8b2840e4a2e7/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-11-19 04:10:10,527 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 04:10:10,528 INFO L262 TraceCheckSpWp]: Trace formula consists of 226 conjuncts, 10 conjunts are in the unsatisfiable core [2023-11-19 04:10:10,543 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 04:10:10,610 INFO L134 CoverageAnalysis]: Checked inductivity of 427 backedges. 27 proven. 166 refuted. 0 times theorem prover too weak. 234 trivial. 0 not checked. [2023-11-19 04:10:10,610 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 04:10:11,254 INFO L134 CoverageAnalysis]: Checked inductivity of 427 backedges. 27 proven. 181 refuted. 0 times theorem prover too weak. 219 trivial. 0 not checked. [2023-11-19 04:10:11,254 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1572008842] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 04:10:11,254 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1730461435] [2023-11-19 04:10:11,258 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2023-11-19 04:10:11,258 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 04:10:11,258 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) [2023-11-19 04:10:11,259 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-19 04:10:11,260 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 11] total 12 [2023-11-19 04:10:11,260 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1922358795] [2023-11-19 04:10:11,260 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-19 04:10:11,263 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2023-11-19 04:10:11,263 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 04:10:11,264 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2023-11-19 04:10:11,264 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=91, Unknown=0, NotChecked=0, Total=132 [2023-11-19 04:10:11,266 INFO L87 Difference]: Start difference. First operand 32 states and 46 transitions. Second operand has 12 states, 11 states have (on average 3.4545454545454546) internal successors, (38), 12 states have internal predecessors, (38), 9 states have call successors, (10), 1 states have call predecessors, (10), 5 states have return successors, (12), 5 states have call predecessors, (12), 9 states have call successors, (12) [2023-11-19 04:10:11,373 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 04:10:11,373 INFO L93 Difference]: Finished difference Result 41 states and 63 transitions. [2023-11-19 04:10:11,373 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-11-19 04:10:11,373 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 11 states have (on average 3.4545454545454546) internal successors, (38), 12 states have internal predecessors, (38), 9 states have call successors, (10), 1 states have call predecessors, (10), 5 states have return successors, (12), 5 states have call predecessors, (12), 9 states have call successors, (12) Word has length 92 [2023-11-19 04:10:11,374 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 04:10:11,375 INFO L225 Difference]: With dead ends: 41 [2023-11-19 04:10:11,375 INFO L226 Difference]: Without dead ends: 37 [2023-11-19 04:10:11,376 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 197 GetRequests, 178 SyntacticMatches, 5 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=85, Invalid=155, Unknown=0, NotChecked=0, Total=240 [2023-11-19 04:10:11,377 INFO L413 NwaCegarLoop]: 10 mSDtfsCounter, 18 mSDsluCounter, 41 mSDsCounter, 0 mSdLazyCounter, 73 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 27 SdHoareTripleChecker+Valid, 51 SdHoareTripleChecker+Invalid, 87 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 73 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-19 04:10:11,377 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [27 Valid, 51 Invalid, 87 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 73 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-19 04:10:11,378 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2023-11-19 04:10:11,384 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2023-11-19 04:10:11,384 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 24 states have (on average 1.0833333333333333) internal successors, (26), 25 states have internal predecessors, (26), 6 states have call successors, (6), 2 states have call predecessors, (6), 6 states have return successors, (27), 9 states have call predecessors, (27), 6 states have call successors, (27) [2023-11-19 04:10:11,385 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 59 transitions. [2023-11-19 04:10:11,386 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 59 transitions. Word has length 92 [2023-11-19 04:10:11,386 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 04:10:11,386 INFO L495 AbstractCegarLoop]: Abstraction has 37 states and 59 transitions. [2023-11-19 04:10:11,387 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 11 states have (on average 3.4545454545454546) internal successors, (38), 12 states have internal predecessors, (38), 9 states have call successors, (10), 1 states have call predecessors, (10), 5 states have return successors, (12), 5 states have call predecessors, (12), 9 states have call successors, (12) [2023-11-19 04:10:11,387 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 59 transitions. [2023-11-19 04:10:11,389 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 147 [2023-11-19 04:10:11,389 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 04:10:11,389 INFO L195 NwaCegarLoop]: trace histogram [21, 21, 17, 10, 10, 10, 10, 10, 10, 10, 7, 4, 1, 1, 1, 1, 1, 1] [2023-11-19 04:10:11,414 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_143da6bf-2527-4445-b8be-8b2840e4a2e7/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-11-19 04:10:11,603 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_143da6bf-2527-4445-b8be-8b2840e4a2e7/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2023-11-19 04:10:11,603 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 04:10:11,603 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 04:10:11,603 INFO L85 PathProgramCache]: Analyzing trace with hash 1355129737, now seen corresponding path program 5 times [2023-11-19 04:10:11,603 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 04:10:11,603 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1366275979] [2023-11-19 04:10:11,603 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 04:10:11,604 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 04:10:11,644 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 04:10:11,981 INFO L134 CoverageAnalysis]: Checked inductivity of 1156 backedges. 274 proven. 117 refuted. 0 times theorem prover too weak. 765 trivial. 0 not checked. [2023-11-19 04:10:11,982 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 04:10:11,982 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1366275979] [2023-11-19 04:10:11,982 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1366275979] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 04:10:11,982 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1908852616] [2023-11-19 04:10:11,982 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-19 04:10:11,982 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 04:10:11,983 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_143da6bf-2527-4445-b8be-8b2840e4a2e7/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 04:10:11,983 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_143da6bf-2527-4445-b8be-8b2840e4a2e7/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 04:10:12,011 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_143da6bf-2527-4445-b8be-8b2840e4a2e7/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-11-19 04:10:12,084 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2023-11-19 04:10:12,084 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-19 04:10:12,085 INFO L262 TraceCheckSpWp]: Trace formula consists of 218 conjuncts, 10 conjunts are in the unsatisfiable core [2023-11-19 04:10:12,090 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 04:10:12,180 INFO L134 CoverageAnalysis]: Checked inductivity of 1156 backedges. 393 proven. 34 refuted. 0 times theorem prover too weak. 729 trivial. 0 not checked. [2023-11-19 04:10:12,180 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 04:10:12,931 INFO L134 CoverageAnalysis]: Checked inductivity of 1156 backedges. 393 proven. 41 refuted. 0 times theorem prover too weak. 722 trivial. 0 not checked. [2023-11-19 04:10:12,932 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1908852616] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 04:10:12,932 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [859832676] [2023-11-19 04:10:12,937 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2023-11-19 04:10:12,937 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 04:10:12,937 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) [2023-11-19 04:10:12,938 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-19 04:10:12,939 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 9, 11] total 20 [2023-11-19 04:10:12,939 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [569840870] [2023-11-19 04:10:12,939 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-19 04:10:12,941 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2023-11-19 04:10:12,941 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 04:10:12,942 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2023-11-19 04:10:12,943 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=298, Unknown=0, NotChecked=0, Total=380 [2023-11-19 04:10:12,943 INFO L87 Difference]: Start difference. First operand 37 states and 59 transitions. Second operand has 20 states, 19 states have (on average 2.8947368421052633) internal successors, (55), 20 states have internal predecessors, (55), 11 states have call successors, (16), 1 states have call predecessors, (16), 8 states have return successors, (23), 11 states have call predecessors, (23), 11 states have call successors, (23) [2023-11-19 04:10:13,260 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 04:10:13,261 INFO L93 Difference]: Finished difference Result 124 states and 341 transitions. [2023-11-19 04:10:13,261 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2023-11-19 04:10:13,261 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 19 states have (on average 2.8947368421052633) internal successors, (55), 20 states have internal predecessors, (55), 11 states have call successors, (16), 1 states have call predecessors, (16), 8 states have return successors, (23), 11 states have call predecessors, (23), 11 states have call successors, (23) Word has length 146 [2023-11-19 04:10:13,266 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 04:10:13,269 INFO L225 Difference]: With dead ends: 124 [2023-11-19 04:10:13,269 INFO L226 Difference]: Without dead ends: 46 [2023-11-19 04:10:13,276 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 312 GetRequests, 281 SyntacticMatches, 4 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 169 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=227, Invalid=585, Unknown=0, NotChecked=0, Total=812 [2023-11-19 04:10:13,277 INFO L413 NwaCegarLoop]: 24 mSDtfsCounter, 53 mSDsluCounter, 73 mSDsCounter, 0 mSdLazyCounter, 234 mSolverCounterSat, 38 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 54 SdHoareTripleChecker+Valid, 97 SdHoareTripleChecker+Invalid, 272 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 38 IncrementalHoareTripleChecker+Valid, 234 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-19 04:10:13,278 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [54 Valid, 97 Invalid, 272 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [38 Valid, 234 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-19 04:10:13,279 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2023-11-19 04:10:13,292 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 43. [2023-11-19 04:10:13,293 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 29 states have (on average 1.0689655172413792) internal successors, (31), 29 states have internal predecessors, (31), 7 states have call successors, (7), 4 states have call predecessors, (7), 6 states have return successors, (10), 9 states have call predecessors, (10), 7 states have call successors, (10) [2023-11-19 04:10:13,294 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 48 transitions. [2023-11-19 04:10:13,295 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 48 transitions. Word has length 146 [2023-11-19 04:10:13,296 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 04:10:13,296 INFO L495 AbstractCegarLoop]: Abstraction has 43 states and 48 transitions. [2023-11-19 04:10:13,297 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 19 states have (on average 2.8947368421052633) internal successors, (55), 20 states have internal predecessors, (55), 11 states have call successors, (16), 1 states have call predecessors, (16), 8 states have return successors, (23), 11 states have call predecessors, (23), 11 states have call successors, (23) [2023-11-19 04:10:13,297 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 48 transitions. [2023-11-19 04:10:13,302 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2023-11-19 04:10:13,302 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 04:10:13,302 INFO L195 NwaCegarLoop]: trace histogram [15, 15, 12, 7, 7, 7, 7, 7, 7, 7, 5, 3, 1, 1, 1, 1, 1, 1] [2023-11-19 04:10:13,332 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_143da6bf-2527-4445-b8be-8b2840e4a2e7/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2023-11-19 04:10:13,515 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_143da6bf-2527-4445-b8be-8b2840e4a2e7/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 04:10:13,515 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 04:10:13,515 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 04:10:13,515 INFO L85 PathProgramCache]: Analyzing trace with hash -1637155854, now seen corresponding path program 6 times [2023-11-19 04:10:13,515 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 04:10:13,516 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [344736261] [2023-11-19 04:10:13,516 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 04:10:13,516 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 04:10:13,550 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-11-19 04:10:13,550 INFO L356 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2023-11-19 04:10:13,588 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-11-19 04:10:13,625 INFO L130 FreeRefinementEngine]: Strategy SIFA_TAIPAN found a feasible trace [2023-11-19 04:10:13,625 INFO L360 BasicCegarLoop]: Counterexample is feasible [2023-11-19 04:10:13,626 INFO L805 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION (0 of 1 remaining) [2023-11-19 04:10:13,628 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2023-11-19 04:10:13,634 INFO L445 BasicCegarLoop]: Path program histogram: [6, 1, 1, 1] [2023-11-19 04:10:13,641 INFO L178 ceAbstractionStarter]: Computing trace abstraction results [2023-11-19 04:10:13,700 WARN L1572 BoogieBacktranslator]: Unfinished Backtranslation: IdentifierExpression #t~ret4 could not be translated [2023-11-19 04:10:13,701 WARN L1572 BoogieBacktranslator]: Unfinished Backtranslation: IdentifierExpression #t~ret4 could not be translated [2023-11-19 04:10:13,701 WARN L1572 BoogieBacktranslator]: Unfinished Backtranslation: IdentifierExpression #t~ret5 could not be translated [2023-11-19 04:10:13,702 WARN L1572 BoogieBacktranslator]: Unfinished Backtranslation: IdentifierExpression #t~ret4 could not be translated [2023-11-19 04:10:13,702 WARN L1572 BoogieBacktranslator]: Unfinished Backtranslation: IdentifierExpression #t~ret4 could not be translated [2023-11-19 04:10:13,703 WARN L1572 BoogieBacktranslator]: Unfinished Backtranslation: IdentifierExpression #t~ret5 could not be translated [2023-11-19 04:10:13,703 WARN L1572 BoogieBacktranslator]: Unfinished Backtranslation: IdentifierExpression #t~ret4 could not be translated [2023-11-19 04:10:13,704 WARN L1572 BoogieBacktranslator]: Unfinished Backtranslation: IdentifierExpression #t~ret4 could not be translated [2023-11-19 04:10:13,704 WARN L1572 BoogieBacktranslator]: Unfinished Backtranslation: IdentifierExpression #t~ret4 could not be translated [2023-11-19 04:10:13,704 WARN L1572 BoogieBacktranslator]: Unfinished Backtranslation: IdentifierExpression #t~ret5 could not be translated [2023-11-19 04:10:13,704 WARN L1572 BoogieBacktranslator]: Unfinished Backtranslation: IdentifierExpression #t~ret4 could not be translated [2023-11-19 04:10:13,705 WARN L1572 BoogieBacktranslator]: Unfinished Backtranslation: IdentifierExpression #t~ret5 could not be translated [2023-11-19 04:10:13,705 WARN L1572 BoogieBacktranslator]: Unfinished Backtranslation: IdentifierExpression #t~ret4 could not be translated [2023-11-19 04:10:13,706 WARN L1572 BoogieBacktranslator]: Unfinished Backtranslation: IdentifierExpression #t~ret4 could not be translated [2023-11-19 04:10:13,706 WARN L1572 BoogieBacktranslator]: Unfinished Backtranslation: IdentifierExpression #t~ret4 could not be translated [2023-11-19 04:10:13,706 WARN L1572 BoogieBacktranslator]: Unfinished Backtranslation: IdentifierExpression #t~ret5 could not be translated [2023-11-19 04:10:13,716 WARN L1572 BoogieBacktranslator]: Unfinished Backtranslation: IdentifierExpression #t~ret4 could not be translated [2023-11-19 04:10:13,716 WARN L1572 BoogieBacktranslator]: Unfinished Backtranslation: IdentifierExpression #t~ret4 could not be translated [2023-11-19 04:10:13,716 WARN L1572 BoogieBacktranslator]: Unfinished Backtranslation: IdentifierExpression #t~ret5 could not be translated [2023-11-19 04:10:13,717 WARN L1572 BoogieBacktranslator]: Unfinished Backtranslation: IdentifierExpression #t~ret4 could not be translated [2023-11-19 04:10:13,717 WARN L1572 BoogieBacktranslator]: Unfinished Backtranslation: IdentifierExpression #t~ret5 could not be translated [2023-11-19 04:10:13,717 WARN L1572 BoogieBacktranslator]: Unfinished Backtranslation: IdentifierExpression #t~ret6 could not be translated [2023-11-19 04:10:13,733 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 19.11 04:10:13 BoogieIcfgContainer [2023-11-19 04:10:13,733 INFO L131 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2023-11-19 04:10:13,734 INFO L112 PluginConnector]: ------------------------Witness Printer---------------------------- [2023-11-19 04:10:13,734 INFO L270 PluginConnector]: Initializing Witness Printer... [2023-11-19 04:10:13,734 INFO L274 PluginConnector]: Witness Printer initialized [2023-11-19 04:10:13,735 INFO L184 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 04:10:05" (3/4) ... [2023-11-19 04:10:13,736 INFO L131 WitnessPrinter]: Generating witness for reachability counterexample [2023-11-19 04:10:13,748 WARN L1572 BoogieBacktranslator]: Unfinished Backtranslation: IdentifierExpression #t~ret4 could not be translated [2023-11-19 04:10:13,752 WARN L1572 BoogieBacktranslator]: Unfinished Backtranslation: IdentifierExpression #t~ret4 could not be translated [2023-11-19 04:10:13,752 WARN L1572 BoogieBacktranslator]: Unfinished Backtranslation: IdentifierExpression #t~ret5 could not be translated [2023-11-19 04:10:13,752 WARN L1572 BoogieBacktranslator]: Unfinished Backtranslation: IdentifierExpression #t~ret4 could not be translated [2023-11-19 04:10:13,755 WARN L1572 BoogieBacktranslator]: Unfinished Backtranslation: IdentifierExpression #t~ret4 could not be translated [2023-11-19 04:10:13,756 WARN L1572 BoogieBacktranslator]: Unfinished Backtranslation: IdentifierExpression #t~ret5 could not be translated [2023-11-19 04:10:13,756 WARN L1572 BoogieBacktranslator]: Unfinished Backtranslation: IdentifierExpression #t~ret4 could not be translated [2023-11-19 04:10:13,757 WARN L1572 BoogieBacktranslator]: Unfinished Backtranslation: IdentifierExpression #t~ret4 could not be translated [2023-11-19 04:10:13,757 WARN L1572 BoogieBacktranslator]: Unfinished Backtranslation: IdentifierExpression #t~ret4 could not be translated [2023-11-19 04:10:13,757 WARN L1572 BoogieBacktranslator]: Unfinished Backtranslation: IdentifierExpression #t~ret5 could not be translated [2023-11-19 04:10:13,757 WARN L1572 BoogieBacktranslator]: Unfinished Backtranslation: IdentifierExpression #t~ret4 could not be translated [2023-11-19 04:10:13,758 WARN L1572 BoogieBacktranslator]: Unfinished Backtranslation: IdentifierExpression #t~ret5 could not be translated [2023-11-19 04:10:13,758 WARN L1572 BoogieBacktranslator]: Unfinished Backtranslation: IdentifierExpression #t~ret4 could not be translated [2023-11-19 04:10:13,759 WARN L1572 BoogieBacktranslator]: Unfinished Backtranslation: IdentifierExpression #t~ret4 could not be translated [2023-11-19 04:10:13,759 WARN L1572 BoogieBacktranslator]: Unfinished Backtranslation: IdentifierExpression #t~ret4 could not be translated [2023-11-19 04:10:13,759 WARN L1572 BoogieBacktranslator]: Unfinished Backtranslation: IdentifierExpression #t~ret5 could not be translated [2023-11-19 04:10:13,760 WARN L1572 BoogieBacktranslator]: Unfinished Backtranslation: IdentifierExpression #t~ret4 could not be translated [2023-11-19 04:10:13,760 WARN L1572 BoogieBacktranslator]: Unfinished Backtranslation: IdentifierExpression #t~ret4 could not be translated [2023-11-19 04:10:13,760 WARN L1572 BoogieBacktranslator]: Unfinished Backtranslation: IdentifierExpression #t~ret5 could not be translated [2023-11-19 04:10:13,760 WARN L1572 BoogieBacktranslator]: Unfinished Backtranslation: IdentifierExpression #t~ret4 could not be translated [2023-11-19 04:10:13,760 WARN L1572 BoogieBacktranslator]: Unfinished Backtranslation: IdentifierExpression #t~ret5 could not be translated [2023-11-19 04:10:13,760 WARN L1572 BoogieBacktranslator]: Unfinished Backtranslation: IdentifierExpression #t~ret6 could not be translated [2023-11-19 04:10:13,801 INFO L149 WitnessManager]: Wrote witness to /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_143da6bf-2527-4445-b8be-8b2840e4a2e7/bin/utaipan-verify-t7M7D8N6sZ/witness.graphml [2023-11-19 04:10:13,802 INFO L131 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2023-11-19 04:10:13,802 INFO L158 Benchmark]: Toolchain (without parser) took 8878.49ms. Allocated memory is still 146.8MB. Free memory was 100.9MB in the beginning and 111.3MB in the end (delta: -10.4MB). There was no memory consumed. Max. memory is 16.1GB. [2023-11-19 04:10:13,803 INFO L158 Benchmark]: CDTParser took 0.33ms. Allocated memory is still 115.3MB. Free memory is still 59.6MB. There was no memory consumed. Max. memory is 16.1GB. [2023-11-19 04:10:13,803 INFO L158 Benchmark]: CACSL2BoogieTranslator took 270.77ms. Allocated memory is still 146.8MB. Free memory was 100.2MB in the beginning and 90.4MB in the end (delta: 9.9MB). Peak memory consumption was 10.5MB. Max. memory is 16.1GB. [2023-11-19 04:10:13,803 INFO L158 Benchmark]: Boogie Procedure Inliner took 37.25ms. Allocated memory is still 146.8MB. Free memory was 90.4MB in the beginning and 89.1MB in the end (delta: 1.3MB). There was no memory consumed. Max. memory is 16.1GB. [2023-11-19 04:10:13,804 INFO L158 Benchmark]: Boogie Preprocessor took 21.02ms. Allocated memory is still 146.8MB. Free memory was 89.1MB in the beginning and 87.7MB in the end (delta: 1.4MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. [2023-11-19 04:10:13,804 INFO L158 Benchmark]: RCFGBuilder took 298.06ms. Allocated memory is still 146.8MB. Free memory was 87.7MB in the beginning and 77.8MB in the end (delta: 9.9MB). Peak memory consumption was 10.5MB. Max. memory is 16.1GB. [2023-11-19 04:10:13,805 INFO L158 Benchmark]: TraceAbstraction took 8174.86ms. Allocated memory is still 146.8MB. Free memory was 77.2MB in the beginning and 114.4MB in the end (delta: -37.3MB). Peak memory consumption was 44.9MB. Max. memory is 16.1GB. [2023-11-19 04:10:13,805 INFO L158 Benchmark]: Witness Printer took 68.09ms. Allocated memory is still 146.8MB. Free memory was 114.4MB in the beginning and 111.3MB in the end (delta: 3.1MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. [2023-11-19 04:10:13,807 INFO L338 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.33ms. Allocated memory is still 115.3MB. Free memory is still 59.6MB. There was no memory consumed. Max. memory is 16.1GB. * CACSL2BoogieTranslator took 270.77ms. Allocated memory is still 146.8MB. Free memory was 100.2MB in the beginning and 90.4MB in the end (delta: 9.9MB). Peak memory consumption was 10.5MB. Max. memory is 16.1GB. * Boogie Procedure Inliner took 37.25ms. Allocated memory is still 146.8MB. Free memory was 90.4MB in the beginning and 89.1MB in the end (delta: 1.3MB). There was no memory consumed. Max. memory is 16.1GB. * Boogie Preprocessor took 21.02ms. Allocated memory is still 146.8MB. Free memory was 89.1MB in the beginning and 87.7MB in the end (delta: 1.4MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. * RCFGBuilder took 298.06ms. Allocated memory is still 146.8MB. Free memory was 87.7MB in the beginning and 77.8MB in the end (delta: 9.9MB). Peak memory consumption was 10.5MB. Max. memory is 16.1GB. * TraceAbstraction took 8174.86ms. Allocated memory is still 146.8MB. Free memory was 77.2MB in the beginning and 114.4MB in the end (delta: -37.3MB). Peak memory consumption was 44.9MB. Max. memory is 16.1GB. * Witness Printer took 68.09ms. Allocated memory is still 146.8MB. Free memory was 114.4MB in the beginning and 111.3MB in the end (delta: 3.1MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: - GenericResult: Unfinished Backtranslation Unfinished Backtranslation: IdentifierExpression #t~ret4 could not be translated - GenericResult: Unfinished Backtranslation Unfinished Backtranslation: IdentifierExpression #t~ret4 could not be translated - GenericResult: Unfinished Backtranslation Unfinished Backtranslation: IdentifierExpression #t~ret5 could not be translated - GenericResult: Unfinished Backtranslation Unfinished Backtranslation: IdentifierExpression #t~ret4 could not be translated - GenericResult: Unfinished Backtranslation Unfinished Backtranslation: IdentifierExpression #t~ret4 could not be translated - GenericResult: Unfinished Backtranslation Unfinished Backtranslation: IdentifierExpression #t~ret5 could not be translated - GenericResult: Unfinished Backtranslation Unfinished Backtranslation: IdentifierExpression #t~ret4 could not be translated - GenericResult: Unfinished Backtranslation Unfinished Backtranslation: IdentifierExpression #t~ret4 could not be translated - GenericResult: Unfinished Backtranslation Unfinished Backtranslation: IdentifierExpression #t~ret4 could not be translated - GenericResult: Unfinished Backtranslation Unfinished Backtranslation: IdentifierExpression #t~ret5 could not be translated - GenericResult: Unfinished Backtranslation Unfinished Backtranslation: IdentifierExpression #t~ret4 could not be translated - GenericResult: Unfinished Backtranslation Unfinished Backtranslation: IdentifierExpression #t~ret5 could not be translated - GenericResult: Unfinished Backtranslation Unfinished Backtranslation: IdentifierExpression #t~ret4 could not be translated - GenericResult: Unfinished Backtranslation Unfinished Backtranslation: IdentifierExpression #t~ret4 could not be translated - GenericResult: Unfinished Backtranslation Unfinished Backtranslation: IdentifierExpression #t~ret4 could not be translated - GenericResult: Unfinished Backtranslation Unfinished Backtranslation: IdentifierExpression #t~ret5 could not be translated - GenericResult: Unfinished Backtranslation Unfinished Backtranslation: IdentifierExpression #t~ret4 could not be translated - GenericResult: Unfinished Backtranslation Unfinished Backtranslation: IdentifierExpression #t~ret4 could not be translated - GenericResult: Unfinished Backtranslation Unfinished Backtranslation: IdentifierExpression #t~ret5 could not be translated - GenericResult: Unfinished Backtranslation Unfinished Backtranslation: IdentifierExpression #t~ret4 could not be translated - GenericResult: Unfinished Backtranslation Unfinished Backtranslation: IdentifierExpression #t~ret5 could not be translated - GenericResult: Unfinished Backtranslation Unfinished Backtranslation: IdentifierExpression #t~ret6 could not be translated - GenericResult: Unfinished Backtranslation The program execution was not completely translated back. - GenericResult: Unfinished Backtranslation Unfinished Backtranslation: IdentifierExpression #t~ret4 could not be translated - GenericResult: Unfinished Backtranslation Unfinished Backtranslation: IdentifierExpression #t~ret4 could not be translated - GenericResult: Unfinished Backtranslation Unfinished Backtranslation: IdentifierExpression #t~ret5 could not be translated - GenericResult: Unfinished Backtranslation Unfinished Backtranslation: IdentifierExpression #t~ret4 could not be translated - GenericResult: Unfinished Backtranslation Unfinished Backtranslation: IdentifierExpression #t~ret4 could not be translated - GenericResult: Unfinished Backtranslation Unfinished Backtranslation: IdentifierExpression #t~ret5 could not be translated - GenericResult: Unfinished Backtranslation Unfinished Backtranslation: IdentifierExpression #t~ret4 could not be translated - GenericResult: Unfinished Backtranslation Unfinished Backtranslation: IdentifierExpression #t~ret4 could not be translated - GenericResult: Unfinished Backtranslation Unfinished Backtranslation: IdentifierExpression #t~ret4 could not be translated - GenericResult: Unfinished Backtranslation Unfinished Backtranslation: IdentifierExpression #t~ret5 could not be translated - GenericResult: Unfinished Backtranslation Unfinished Backtranslation: IdentifierExpression #t~ret4 could not be translated - GenericResult: Unfinished Backtranslation Unfinished Backtranslation: IdentifierExpression #t~ret5 could not be translated - GenericResult: Unfinished Backtranslation Unfinished Backtranslation: IdentifierExpression #t~ret4 could not be translated - GenericResult: Unfinished Backtranslation Unfinished Backtranslation: IdentifierExpression #t~ret4 could not be translated - GenericResult: Unfinished Backtranslation Unfinished Backtranslation: IdentifierExpression #t~ret4 could not be translated - GenericResult: Unfinished Backtranslation Unfinished Backtranslation: IdentifierExpression #t~ret5 could not be translated - GenericResult: Unfinished Backtranslation Unfinished Backtranslation: IdentifierExpression #t~ret4 could not be translated - GenericResult: Unfinished Backtranslation Unfinished Backtranslation: IdentifierExpression #t~ret4 could not be translated - GenericResult: Unfinished Backtranslation Unfinished Backtranslation: IdentifierExpression #t~ret5 could not be translated - GenericResult: Unfinished Backtranslation Unfinished Backtranslation: IdentifierExpression #t~ret4 could not be translated - GenericResult: Unfinished Backtranslation Unfinished Backtranslation: IdentifierExpression #t~ret5 could not be translated - GenericResult: Unfinished Backtranslation Unfinished Backtranslation: IdentifierExpression #t~ret6 could not be translated - GenericResult: Unfinished Backtranslation The program execution was not completely translated back. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - StatisticsResult: ErrorAutomatonStatistics NumberErrorTraces: 0, NumberStatementsAllTraces: 0, NumberRelevantStatements: 0, 0.0s ErrorAutomatonConstructionTimeTotal, 0.0s FaulLocalizationTime, NumberStatementsFirstTrace: -1, TraceLengthAvg: 0, 0.0s ErrorAutomatonConstructionTimeAvg, 0.0s ErrorAutomatonDifferenceTimeAvg, 0.0s ErrorAutomatonDifferenceTimeTotal, NumberOfNoEnhancement: 0, NumberOfFiniteEnhancement: 0, NumberOfInfiniteEnhancement: 0 - CounterExampleResult [Line: 29]: a call to reach_error is reachable a call to reach_error is reachable We found a FailurePath: [L26] int x = 5; VAL [x=5] [L27] CALL, EXPR fibo(x) VAL [\old(n)=5] [L8] COND FALSE !(n < 1) VAL [\old(n)=5, n=5] [L10] COND FALSE !(n == 1) VAL [\old(n)=5, n=5] [L13] CALL, EXPR fibo(n-1) VAL [\old(n)=4] [L8] COND FALSE !(n < 1) VAL [\old(n)=4, n=4] [L10] COND FALSE !(n == 1) VAL [\old(n)=4, n=4] [L13] CALL, EXPR fibo(n-1) VAL [\old(n)=3] [L8] COND FALSE !(n < 1) VAL [\old(n)=3, n=3] [L10] COND FALSE !(n == 1) VAL [\old(n)=3, n=3] [L13] CALL, EXPR fibo(n-1) VAL [\old(n)=2] [L8] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L10] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L13] CALL, EXPR fibo(n-1) VAL [\old(n)=1] [L8] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L10] COND TRUE n == 1 [L11] return 1; VAL [\old(n)=1, \result=1, n=1] [L13] RET, EXPR fibo(n-1) VAL [\old(n)=2, n=2] [L13] CALL, EXPR fibo(n-2) VAL [\old(n)=0] [L8] COND TRUE n < 1 [L9] return 0; VAL [\old(n)=0, \result=0, n=0] [L13] RET, EXPR fibo(n-2) VAL [\old(n)=2, n=2] [L13] return fibo(n-1) + fibo(n-2); [L13] RET, EXPR fibo(n-1) VAL [\old(n)=3, n=3] [L13] CALL, EXPR fibo(n-2) VAL [\old(n)=1] [L8] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L10] COND TRUE n == 1 [L11] return 1; VAL [\old(n)=1, \result=1, n=1] [L13] RET, EXPR fibo(n-2) VAL [\old(n)=3, n=3] [L13] return fibo(n-1) + fibo(n-2); [L13] RET, EXPR fibo(n-1) VAL [\old(n)=4, n=4] [L13] CALL, EXPR fibo(n-2) VAL [\old(n)=2] [L8] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L10] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L13] CALL, EXPR fibo(n-1) VAL [\old(n)=1] [L8] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L10] COND TRUE n == 1 [L11] return 1; VAL [\old(n)=1, \result=1, n=1] [L13] RET, EXPR fibo(n-1) VAL [\old(n)=2, n=2] [L13] CALL, EXPR fibo(n-2) VAL [\old(n)=0] [L8] COND TRUE n < 1 [L9] return 0; VAL [\old(n)=0, \result=0, n=0] [L13] RET, EXPR fibo(n-2) VAL [\old(n)=2, n=2] [L13] return fibo(n-1) + fibo(n-2); [L13] RET, EXPR fibo(n-2) VAL [\old(n)=4, n=4] [L13] return fibo(n-1) + fibo(n-2); [L13] RET, EXPR fibo(n-1) VAL [\old(n)=5, n=5] [L13] CALL, EXPR fibo(n-2) VAL [\old(n)=3] [L8] COND FALSE !(n < 1) VAL [\old(n)=3, n=3] [L10] COND FALSE !(n == 1) VAL [\old(n)=3, n=3] [L13] CALL, EXPR fibo(n-1) VAL [\old(n)=2] [L8] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L10] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L13] CALL, EXPR fibo(n-1) VAL [\old(n)=1] [L8] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L10] COND TRUE n == 1 [L11] return 1; VAL [\old(n)=1, \result=1, n=1] [L13] RET, EXPR fibo(n-1) VAL [\old(n)=2, n=2] [L13] CALL, EXPR fibo(n-2) VAL [\old(n)=0] [L8] COND TRUE n < 1 [L9] return 0; VAL [\old(n)=0, \result=0, n=0] [L13] RET, EXPR fibo(n-2) VAL [\old(n)=2, n=2] [L13] return fibo(n-1) + fibo(n-2); [L13] RET, EXPR fibo(n-1) VAL [\old(n)=3, n=3] [L13] CALL, EXPR fibo(n-2) VAL [\old(n)=1] [L8] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L10] COND TRUE n == 1 [L11] return 1; VAL [\old(n)=1, \result=1, n=1] [L13] RET, EXPR fibo(n-2) VAL [\old(n)=3, n=3] [L13] return fibo(n-1) + fibo(n-2); [L13] RET, EXPR fibo(n-2) VAL [\old(n)=5, n=5] [L13] return fibo(n-1) + fibo(n-2); [L27] RET, EXPR fibo(x) VAL [x=5] [L27] int result = fibo(x); [L28] COND TRUE result == 5 VAL [result=5, x=5] [L29] reach_error() VAL [result=5, x=5] - StatisticsResult: Ultimate Automizer benchmark data CFG has 2 procedures, 17 locations, 1 error locations. Started 1 CEGAR loops. OverallTime: 8.0s, OverallIterations: 9, TraceHistogramMax: 21, PathProgramHistogramMax: 6, EmptinessCheckTime: 0.0s, AutomataDifference: 1.2s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 0 mSolverCounterUnknown, 186 SdHoareTripleChecker+Valid, 0.6s IncrementalHoareTripleChecker+Time, 0 mSdLazyCounter, 160 mSDsluCounter, 462 SdHoareTripleChecker+Invalid, 0.5s Time, 0 mProtectedAction, 0 SdHoareTripleChecker+Unchecked, 0 IncrementalHoareTripleChecker+Unchecked, 346 mSDsCounter, 108 IncrementalHoareTripleChecker+Valid, 0 mProtectedPredicate, 622 IncrementalHoareTripleChecker+Invalid, 730 SdHoareTripleChecker+Unknown, 0 mSolverCounterNotChecked, 108 mSolverCounterUnsat, 116 mSDtfsCounter, 622 mSolverCounterSat, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Unknown, PredicateUnifierStatistics: 0 DeclaredPredicates, 801 GetRequests, 683 SyntacticMatches, 18 SemanticMatches, 100 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 315 ImplicationChecksByTransitivity, 0.9s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=43occurred in iteration=8, InterpolantAutomatonStates: 66, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.1s AutomataMinimizationTime, 8 MinimizatonAttempts, 11 StatesRemovedByMinimization, 3 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.1s SsaConstructionTime, 0.3s SatisfiabilityAnalysisTime, 4.3s InterpolantComputationTime, 836 NumberOfCodeBlocks, 761 NumberOfCodeBlocksAsserted, 28 NumberOfCheckSat, 1067 ConstructedInterpolants, 0 QuantifiedInterpolants, 2003 SizeOfPredicates, 17 NumberOfNonLiveVariables, 755 ConjunctsInSsa, 46 ConjunctsInUnsatCore, 20 InterpolantComputations, 2 PerfectInterpolantSequences, 4270/5115 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! [2023-11-19 04:10:13,855 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_143da6bf-2527-4445-b8be-8b2840e4a2e7/bin/utaipan-verify-t7M7D8N6sZ/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Forceful destruction successful, exit code 0 Received shutdown request... --- End real Ultimate output --- Execution finished normally Writing output log to file Ultimate.log Writing human readable error path to file UltimateCounterExample.errorpath Result: FALSE