./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/loops-crafted-1/watermelon.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version e7bb482b Calling Ultimate with: /usr/lib/jvm/java-1.11.0-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab4048c9-63b4-4f44-9ac7-fe747415a85e/bin/utaipan-verify-FOvIYxoinp/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab4048c9-63b4-4f44-9ac7-fe747415a85e/bin/utaipan-verify-FOvIYxoinp/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab4048c9-63b4-4f44-9ac7-fe747415a85e/bin/utaipan-verify-FOvIYxoinp/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab4048c9-63b4-4f44-9ac7-fe747415a85e/bin/utaipan-verify-FOvIYxoinp/config/TaipanReach.xml -i ../../sv-benchmarks/c/loops-crafted-1/watermelon.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab4048c9-63b4-4f44-9ac7-fe747415a85e/bin/utaipan-verify-FOvIYxoinp/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab4048c9-63b4-4f44-9ac7-fe747415a85e/bin/utaipan-verify-FOvIYxoinp --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash dda0b992ac1600896503297d86377b482d0a82ded923ea00c7e9ff3fed4db7e7 --- Real Ultimate output --- This is Ultimate 0.2.3-dev-e7bb482 [2023-11-06 20:57:37,737 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-06 20:57:37,883 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab4048c9-63b4-4f44-9ac7-fe747415a85e/bin/utaipan-verify-FOvIYxoinp/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-11-06 20:57:37,894 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-06 20:57:37,895 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-06 20:57:37,942 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-06 20:57:37,943 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-06 20:57:37,943 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-06 20:57:37,945 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-06 20:57:37,953 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-06 20:57:37,953 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-06 20:57:37,954 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-06 20:57:37,955 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-06 20:57:37,957 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-06 20:57:37,958 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-06 20:57:37,958 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-06 20:57:37,959 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-06 20:57:37,959 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-06 20:57:37,960 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-06 20:57:37,960 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-06 20:57:37,961 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-06 20:57:37,968 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-06 20:57:37,970 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-06 20:57:37,970 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-11-06 20:57:37,971 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-06 20:57:37,971 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-06 20:57:37,972 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-06 20:57:37,972 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-06 20:57:37,973 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-11-06 20:57:37,973 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-06 20:57:37,975 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-11-06 20:57:37,975 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-06 20:57:37,976 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-11-06 20:57:37,976 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-06 20:57:37,976 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-06 20:57:37,976 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-06 20:57:37,977 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-06 20:57:37,977 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-06 20:57:37,977 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-06 20:57:37,978 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2023-11-06 20:57:37,978 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-06 20:57:37,978 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-06 20:57:37,979 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-11-06 20:57:37,979 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-06 20:57:37,980 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-06 20:57:37,980 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_ab4048c9-63b4-4f44-9ac7-fe747415a85e/bin/utaipan-verify-FOvIYxoinp/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab4048c9-63b4-4f44-9ac7-fe747415a85e/bin/utaipan-verify-FOvIYxoinp Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> dda0b992ac1600896503297d86377b482d0a82ded923ea00c7e9ff3fed4db7e7 [2023-11-06 20:57:38,318 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-06 20:57:38,359 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-06 20:57:38,362 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-06 20:57:38,364 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-06 20:57:38,364 INFO L274 PluginConnector]: CDTParser initialized [2023-11-06 20:57:38,367 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab4048c9-63b4-4f44-9ac7-fe747415a85e/bin/utaipan-verify-FOvIYxoinp/../../sv-benchmarks/c/loops-crafted-1/watermelon.c [2023-11-06 20:57:41,555 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-06 20:57:41,812 INFO L384 CDTParser]: Found 1 translation units. [2023-11-06 20:57:41,813 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab4048c9-63b4-4f44-9ac7-fe747415a85e/sv-benchmarks/c/loops-crafted-1/watermelon.c [2023-11-06 20:57:41,829 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab4048c9-63b4-4f44-9ac7-fe747415a85e/bin/utaipan-verify-FOvIYxoinp/data/547bdc63b/4e404c879a3545128cc42d61e304570a/FLAGcab59211a [2023-11-06 20:57:41,849 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab4048c9-63b4-4f44-9ac7-fe747415a85e/bin/utaipan-verify-FOvIYxoinp/data/547bdc63b/4e404c879a3545128cc42d61e304570a [2023-11-06 20:57:41,853 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-06 20:57:41,854 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-06 20:57:41,855 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-06 20:57:41,855 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-06 20:57:41,860 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-06 20:57:41,861 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.11 08:57:41" (1/1) ... [2023-11-06 20:57:41,862 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3490099a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:57:41, skipping insertion in model container [2023-11-06 20:57:41,862 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.11 08:57:41" (1/1) ... [2023-11-06 20:57:41,884 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-06 20:57:42,051 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_ab4048c9-63b4-4f44-9ac7-fe747415a85e/sv-benchmarks/c/loops-crafted-1/watermelon.c[373,386] [2023-11-06 20:57:42,078 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-06 20:57:42,091 INFO L202 MainTranslator]: Completed pre-run [2023-11-06 20:57:42,106 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_ab4048c9-63b4-4f44-9ac7-fe747415a85e/sv-benchmarks/c/loops-crafted-1/watermelon.c[373,386] [2023-11-06 20:57:42,129 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-06 20:57:42,148 INFO L206 MainTranslator]: Completed translation [2023-11-06 20:57:42,149 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:57:42 WrapperNode [2023-11-06 20:57:42,149 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-06 20:57:42,151 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-06 20:57:42,151 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-06 20:57:42,151 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-06 20:57:42,158 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:57:42" (1/1) ... [2023-11-06 20:57:42,164 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:57:42" (1/1) ... [2023-11-06 20:57:42,183 INFO L138 Inliner]: procedures = 15, calls = 10, calls flagged for inlining = 5, calls inlined = 5, statements flattened = 66 [2023-11-06 20:57:42,183 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-06 20:57:42,184 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-06 20:57:42,184 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-06 20:57:42,184 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-06 20:57:42,194 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:57:42" (1/1) ... [2023-11-06 20:57:42,194 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:57:42" (1/1) ... [2023-11-06 20:57:42,196 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:57:42" (1/1) ... [2023-11-06 20:57:42,196 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:57:42" (1/1) ... [2023-11-06 20:57:42,200 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:57:42" (1/1) ... [2023-11-06 20:57:42,203 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:57:42" (1/1) ... [2023-11-06 20:57:42,205 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:57:42" (1/1) ... [2023-11-06 20:57:42,206 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:57:42" (1/1) ... [2023-11-06 20:57:42,208 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-06 20:57:42,209 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-06 20:57:42,209 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-06 20:57:42,209 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-06 20:57:42,210 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:57:42" (1/1) ... [2023-11-06 20:57:42,217 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-06 20:57:42,235 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab4048c9-63b4-4f44-9ac7-fe747415a85e/bin/utaipan-verify-FOvIYxoinp/z3 [2023-11-06 20:57:42,253 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab4048c9-63b4-4f44-9ac7-fe747415a85e/bin/utaipan-verify-FOvIYxoinp/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-06 20:57:42,255 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab4048c9-63b4-4f44-9ac7-fe747415a85e/bin/utaipan-verify-FOvIYxoinp/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-06 20:57:42,291 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-06 20:57:42,291 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-06 20:57:42,292 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-06 20:57:42,292 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-06 20:57:42,356 INFO L236 CfgBuilder]: Building ICFG [2023-11-06 20:57:42,358 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-06 20:57:42,541 INFO L277 CfgBuilder]: Performing block encoding [2023-11-06 20:57:42,590 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-06 20:57:42,591 INFO L302 CfgBuilder]: Removed 2 assume(true) statements. [2023-11-06 20:57:42,593 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.11 08:57:42 BoogieIcfgContainer [2023-11-06 20:57:42,594 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-06 20:57:42,597 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-06 20:57:42,597 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-06 20:57:42,600 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-06 20:57:42,601 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.11 08:57:41" (1/3) ... [2023-11-06 20:57:42,601 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@58947a43 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.11 08:57:42, skipping insertion in model container [2023-11-06 20:57:42,602 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:57:42" (2/3) ... [2023-11-06 20:57:42,602 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@58947a43 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.11 08:57:42, skipping insertion in model container [2023-11-06 20:57:42,602 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.11 08:57:42" (3/3) ... [2023-11-06 20:57:42,604 INFO L112 eAbstractionObserver]: Analyzing ICFG watermelon.c [2023-11-06 20:57:42,627 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-06 20:57:42,627 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-11-06 20:57:42,685 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-06 20:57:42,693 INFO L357 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mPorIndependenceSettings=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@2526190f, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-06 20:57:42,694 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-11-06 20:57:42,699 INFO L276 IsEmpty]: Start isEmpty. Operand has 14 states, 12 states have (on average 1.5833333333333333) internal successors, (19), 13 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:57:42,706 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2023-11-06 20:57:42,706 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 20:57:42,707 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 20:57:42,708 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-06 20:57:42,714 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 20:57:42,715 INFO L85 PathProgramCache]: Analyzing trace with hash -56464531, now seen corresponding path program 1 times [2023-11-06 20:57:42,727 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 20:57:42,727 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [310981341] [2023-11-06 20:57:42,728 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:57:42,728 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 20:57:42,866 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:57:43,256 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-06 20:57:43,268 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 20:57:43,269 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [310981341] [2023-11-06 20:57:43,270 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [310981341] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-06 20:57:43,270 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-06 20:57:43,270 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2023-11-06 20:57:43,272 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [684504272] [2023-11-06 20:57:43,273 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-06 20:57:43,278 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-11-06 20:57:43,278 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 20:57:43,318 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-11-06 20:57:43,319 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-06 20:57:43,322 INFO L87 Difference]: Start difference. First operand has 14 states, 12 states have (on average 1.5833333333333333) internal successors, (19), 13 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 6 states, 6 states have (on average 1.3333333333333333) internal successors, (8), 6 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:57:43,512 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 20:57:43,513 INFO L93 Difference]: Finished difference Result 30 states and 38 transitions. [2023-11-06 20:57:43,514 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-11-06 20:57:43,515 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 1.3333333333333333) internal successors, (8), 6 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2023-11-06 20:57:43,516 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 20:57:43,523 INFO L225 Difference]: With dead ends: 30 [2023-11-06 20:57:43,523 INFO L226 Difference]: Without dead ends: 18 [2023-11-06 20:57:43,526 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2023-11-06 20:57:43,530 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 12 mSDsluCounter, 28 mSDsCounter, 0 mSdLazyCounter, 57 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 36 SdHoareTripleChecker+Invalid, 59 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 57 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-06 20:57:43,532 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [12 Valid, 36 Invalid, 59 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 57 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-06 20:57:43,549 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2023-11-06 20:57:43,563 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 13. [2023-11-06 20:57:43,565 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13 states, 12 states have (on average 1.3333333333333333) internal successors, (16), 12 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:57:43,565 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 16 transitions. [2023-11-06 20:57:43,567 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 16 transitions. Word has length 8 [2023-11-06 20:57:43,567 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 20:57:43,568 INFO L495 AbstractCegarLoop]: Abstraction has 13 states and 16 transitions. [2023-11-06 20:57:43,568 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 1.3333333333333333) internal successors, (8), 6 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:57:43,568 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 16 transitions. [2023-11-06 20:57:43,569 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2023-11-06 20:57:43,569 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 20:57:43,569 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 20:57:43,570 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-06 20:57:43,570 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-06 20:57:43,571 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 20:57:43,571 INFO L85 PathProgramCache]: Analyzing trace with hash -1748207453, now seen corresponding path program 1 times [2023-11-06 20:57:43,571 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 20:57:43,572 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1406937249] [2023-11-06 20:57:43,572 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:57:43,572 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 20:57:43,593 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:57:43,662 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-06 20:57:43,663 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 20:57:43,663 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1406937249] [2023-11-06 20:57:43,663 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1406937249] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-06 20:57:43,664 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-06 20:57:43,664 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-06 20:57:43,664 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1960697918] [2023-11-06 20:57:43,664 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-06 20:57:43,666 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-06 20:57:43,666 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 20:57:43,667 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-06 20:57:43,667 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-06 20:57:43,668 INFO L87 Difference]: Start difference. First operand 13 states and 16 transitions. Second operand has 3 states, 3 states have (on average 3.0) internal successors, (9), 3 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:57:43,694 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 20:57:43,694 INFO L93 Difference]: Finished difference Result 18 states and 21 transitions. [2023-11-06 20:57:43,694 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-06 20:57:43,695 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 3.0) internal successors, (9), 3 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2023-11-06 20:57:43,695 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 20:57:43,696 INFO L225 Difference]: With dead ends: 18 [2023-11-06 20:57:43,696 INFO L226 Difference]: Without dead ends: 14 [2023-11-06 20:57:43,696 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-06 20:57:43,698 INFO L413 NwaCegarLoop]: 7 mSDtfsCounter, 0 mSDsluCounter, 5 mSDsCounter, 0 mSdLazyCounter, 15 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 12 SdHoareTripleChecker+Invalid, 15 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 15 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-06 20:57:43,699 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 12 Invalid, 15 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 15 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-06 20:57:43,701 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2023-11-06 20:57:43,704 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2023-11-06 20:57:43,704 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14 states, 13 states have (on average 1.3076923076923077) internal successors, (17), 13 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:57:43,705 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 17 transitions. [2023-11-06 20:57:43,705 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 17 transitions. Word has length 9 [2023-11-06 20:57:43,706 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 20:57:43,706 INFO L495 AbstractCegarLoop]: Abstraction has 14 states and 17 transitions. [2023-11-06 20:57:43,706 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 3.0) internal successors, (9), 3 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:57:43,707 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 17 transitions. [2023-11-06 20:57:43,707 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2023-11-06 20:57:43,707 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 20:57:43,708 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 20:57:43,708 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-11-06 20:57:43,708 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-06 20:57:43,709 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 20:57:43,709 INFO L85 PathProgramCache]: Analyzing trace with hash 352892195, now seen corresponding path program 1 times [2023-11-06 20:57:43,710 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 20:57:43,710 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [963414509] [2023-11-06 20:57:43,710 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:57:43,711 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 20:57:43,733 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:57:43,844 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-06 20:57:43,845 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 20:57:43,845 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [963414509] [2023-11-06 20:57:43,845 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [963414509] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-06 20:57:43,846 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-06 20:57:43,846 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-06 20:57:43,846 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [394793537] [2023-11-06 20:57:43,846 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-06 20:57:43,847 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-06 20:57:43,847 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 20:57:43,848 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-06 20:57:43,848 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-06 20:57:43,849 INFO L87 Difference]: Start difference. First operand 14 states and 17 transitions. Second operand has 3 states, 3 states have (on average 3.0) internal successors, (9), 3 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:57:43,878 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 20:57:43,878 INFO L93 Difference]: Finished difference Result 23 states and 28 transitions. [2023-11-06 20:57:43,879 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-06 20:57:43,879 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 3.0) internal successors, (9), 3 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2023-11-06 20:57:43,880 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 20:57:43,880 INFO L225 Difference]: With dead ends: 23 [2023-11-06 20:57:43,881 INFO L226 Difference]: Without dead ends: 15 [2023-11-06 20:57:43,881 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-06 20:57:43,883 INFO L413 NwaCegarLoop]: 7 mSDtfsCounter, 0 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 16 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 11 SdHoareTripleChecker+Invalid, 16 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 16 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-06 20:57:43,884 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 11 Invalid, 16 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 16 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-06 20:57:43,885 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2023-11-06 20:57:43,889 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2023-11-06 20:57:43,889 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 14 states have (on average 1.2857142857142858) internal successors, (18), 14 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:57:43,890 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 18 transitions. [2023-11-06 20:57:43,891 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 18 transitions. Word has length 9 [2023-11-06 20:57:43,891 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 20:57:43,891 INFO L495 AbstractCegarLoop]: Abstraction has 15 states and 18 transitions. [2023-11-06 20:57:43,891 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 3.0) internal successors, (9), 3 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:57:43,892 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 18 transitions. [2023-11-06 20:57:43,892 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2023-11-06 20:57:43,893 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 20:57:43,893 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 20:57:43,893 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2023-11-06 20:57:43,894 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-06 20:57:43,894 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 20:57:43,895 INFO L85 PathProgramCache]: Analyzing trace with hash 1631254561, now seen corresponding path program 1 times [2023-11-06 20:57:43,895 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 20:57:43,895 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1077825103] [2023-11-06 20:57:43,895 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:57:43,896 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 20:57:43,934 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:57:44,050 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-06 20:57:44,051 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 20:57:44,051 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1077825103] [2023-11-06 20:57:44,052 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1077825103] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-06 20:57:44,052 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [560771595] [2023-11-06 20:57:44,053 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:57:44,053 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 20:57:44,054 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab4048c9-63b4-4f44-9ac7-fe747415a85e/bin/utaipan-verify-FOvIYxoinp/z3 [2023-11-06 20:57:44,060 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab4048c9-63b4-4f44-9ac7-fe747415a85e/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-06 20:57:44,092 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab4048c9-63b4-4f44-9ac7-fe747415a85e/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-06 20:57:44,138 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:57:44,140 INFO L262 TraceCheckSpWp]: Trace formula consists of 73 conjuncts, 6 conjunts are in the unsatisfiable core [2023-11-06 20:57:44,146 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-06 20:57:44,434 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-06 20:57:44,434 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-06 20:57:44,434 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [560771595] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-06 20:57:44,435 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-06 20:57:44,435 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [4] total 7 [2023-11-06 20:57:44,435 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [593774889] [2023-11-06 20:57:44,435 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-06 20:57:44,441 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-06 20:57:44,441 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 20:57:44,442 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-06 20:57:44,444 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-11-06 20:57:44,444 INFO L87 Difference]: Start difference. First operand 15 states and 18 transitions. Second operand has 5 states, 5 states have (on average 2.0) internal successors, (10), 5 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:57:44,576 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 20:57:44,576 INFO L93 Difference]: Finished difference Result 22 states and 25 transitions. [2023-11-06 20:57:44,577 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-06 20:57:44,577 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.0) internal successors, (10), 5 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 10 [2023-11-06 20:57:44,577 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 20:57:44,578 INFO L225 Difference]: With dead ends: 22 [2023-11-06 20:57:44,578 INFO L226 Difference]: Without dead ends: 14 [2023-11-06 20:57:44,579 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=20, Invalid=52, Unknown=0, NotChecked=0, Total=72 [2023-11-06 20:57:44,588 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 5 mSDsluCounter, 11 mSDsCounter, 0 mSdLazyCounter, 33 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 16 SdHoareTripleChecker+Invalid, 34 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 33 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-06 20:57:44,590 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [5 Valid, 16 Invalid, 34 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 33 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-06 20:57:44,593 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2023-11-06 20:57:44,599 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 13. [2023-11-06 20:57:44,599 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13 states, 12 states have (on average 1.25) internal successors, (15), 12 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:57:44,600 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 15 transitions. [2023-11-06 20:57:44,600 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 15 transitions. Word has length 10 [2023-11-06 20:57:44,600 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 20:57:44,601 INFO L495 AbstractCegarLoop]: Abstraction has 13 states and 15 transitions. [2023-11-06 20:57:44,601 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.0) internal successors, (10), 5 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:57:44,601 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 15 transitions. [2023-11-06 20:57:44,601 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2023-11-06 20:57:44,602 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 20:57:44,602 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 20:57:44,617 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab4048c9-63b4-4f44-9ac7-fe747415a85e/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2023-11-06 20:57:44,810 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab4048c9-63b4-4f44-9ac7-fe747415a85e/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 20:57:44,810 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-06 20:57:44,811 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 20:57:44,811 INFO L85 PathProgramCache]: Analyzing trace with hash 1505402848, now seen corresponding path program 1 times [2023-11-06 20:57:44,811 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 20:57:44,812 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [570144305] [2023-11-06 20:57:44,812 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:57:44,812 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 20:57:44,843 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:57:44,934 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-06 20:57:44,935 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 20:57:44,935 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [570144305] [2023-11-06 20:57:44,935 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [570144305] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-06 20:57:44,935 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [73848600] [2023-11-06 20:57:44,936 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:57:44,936 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 20:57:44,936 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab4048c9-63b4-4f44-9ac7-fe747415a85e/bin/utaipan-verify-FOvIYxoinp/z3 [2023-11-06 20:57:44,937 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab4048c9-63b4-4f44-9ac7-fe747415a85e/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-06 20:57:44,964 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab4048c9-63b4-4f44-9ac7-fe747415a85e/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-06 20:57:45,000 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:57:45,001 INFO L262 TraceCheckSpWp]: Trace formula consists of 73 conjuncts, 4 conjunts are in the unsatisfiable core [2023-11-06 20:57:45,003 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-06 20:57:45,031 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-06 20:57:45,032 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-06 20:57:45,055 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-06 20:57:45,056 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [73848600] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-06 20:57:45,056 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [70237884] [2023-11-06 20:57:45,078 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2023-11-06 20:57:45,078 INFO L166 IcfgInterpreter]: Building call graph [2023-11-06 20:57:45,083 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-06 20:57:45,088 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-06 20:57:45,089 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-06 20:57:45,651 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-06 20:57:46,419 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '348#(and (<= 1 |#StackHeapBarrier|) (exists ((|v_ULTIMATE.start_correct_version_~i~0#1_34| Int) (|v_ULTIMATE.start_correct_version_~w#1_19| Int)) (and (<= 4 |v_ULTIMATE.start_correct_version_~w#1_19|) (= |v_ULTIMATE.start_correct_version_~i~0#1_34| |v_ULTIMATE.start_correct_version_~w#1_19|) (= |ULTIMATE.start_correct_version_#res#1| 1))) (= ~true~0 1) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= |ULTIMATE.start_correct_version_#res#1| |ULTIMATE.start_main_~is_divisible1~0#1|) (= ~false~0 0) (= |ULTIMATE.start_student_version_#res#1| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0) (<= 0 (+ |ULTIMATE.start_correct_version_#res#1| 2147483648)) (<= |ULTIMATE.start_correct_version_#res#1| 2147483647) (= |ULTIMATE.start_main_~is_divisible2~0#1| 0) (not (= |ULTIMATE.start_main_~is_divisible1~0#1| 0)) (exists ((|v_ULTIMATE.start_student_version_~w#1_22| Int)) (and (or (= (mod |ULTIMATE.start_main_~w~0#1| 4294967296) |v_ULTIMATE.start_student_version_~w#1_22|) (and (<= 2147483648 (mod |ULTIMATE.start_main_~w~0#1| 4294967296)) (= (+ 4294967296 |v_ULTIMATE.start_student_version_~w#1_22|) (mod |ULTIMATE.start_main_~w~0#1| 4294967296)))) (<= |v_ULTIMATE.start_student_version_~w#1_22| 3))))' at error location [2023-11-06 20:57:46,420 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-06 20:57:46,420 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-06 20:57:46,420 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 8 [2023-11-06 20:57:46,421 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [263623474] [2023-11-06 20:57:46,421 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-06 20:57:46,422 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-11-06 20:57:46,422 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 20:57:46,423 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-11-06 20:57:46,424 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=194, Unknown=0, NotChecked=0, Total=240 [2023-11-06 20:57:46,424 INFO L87 Difference]: Start difference. First operand 13 states and 15 transitions. Second operand has 8 states, 8 states have (on average 2.0) internal successors, (16), 8 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:57:46,459 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 20:57:46,459 INFO L93 Difference]: Finished difference Result 22 states and 26 transitions. [2023-11-06 20:57:46,459 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-06 20:57:46,460 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.0) internal successors, (16), 8 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 10 [2023-11-06 20:57:46,460 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 20:57:46,461 INFO L225 Difference]: With dead ends: 22 [2023-11-06 20:57:46,462 INFO L226 Difference]: Without dead ends: 14 [2023-11-06 20:57:46,462 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 78 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=46, Invalid=194, Unknown=0, NotChecked=0, Total=240 [2023-11-06 20:57:46,463 INFO L413 NwaCegarLoop]: 6 mSDtfsCounter, 0 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 18 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 10 SdHoareTripleChecker+Invalid, 18 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 18 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-06 20:57:46,463 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 10 Invalid, 18 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 18 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-06 20:57:46,464 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2023-11-06 20:57:46,468 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2023-11-06 20:57:46,469 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14 states, 13 states have (on average 1.2307692307692308) internal successors, (16), 13 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:57:46,471 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 16 transitions. [2023-11-06 20:57:46,474 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 16 transitions. Word has length 10 [2023-11-06 20:57:46,475 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 20:57:46,475 INFO L495 AbstractCegarLoop]: Abstraction has 14 states and 16 transitions. [2023-11-06 20:57:46,475 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 2.0) internal successors, (16), 8 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:57:46,476 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 16 transitions. [2023-11-06 20:57:46,476 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2023-11-06 20:57:46,477 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 20:57:46,477 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 20:57:46,485 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab4048c9-63b4-4f44-9ac7-fe747415a85e/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-11-06 20:57:46,685 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab4048c9-63b4-4f44-9ac7-fe747415a85e/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 20:57:46,687 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-06 20:57:46,688 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 20:57:46,688 INFO L85 PathProgramCache]: Analyzing trace with hash -1421472573, now seen corresponding path program 2 times [2023-11-06 20:57:46,688 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 20:57:46,688 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1196929692] [2023-11-06 20:57:46,688 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:57:46,689 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 20:57:46,707 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:57:46,943 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-11-06 20:57:46,944 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 20:57:46,944 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1196929692] [2023-11-06 20:57:46,944 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1196929692] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-06 20:57:46,944 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-06 20:57:46,944 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2023-11-06 20:57:46,945 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1509062636] [2023-11-06 20:57:46,945 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-06 20:57:46,946 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-11-06 20:57:46,947 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 20:57:46,948 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-11-06 20:57:46,948 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2023-11-06 20:57:46,948 INFO L87 Difference]: Start difference. First operand 14 states and 16 transitions. Second operand has 6 states, 6 states have (on average 1.6666666666666667) internal successors, (10), 6 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:57:47,007 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 20:57:47,008 INFO L93 Difference]: Finished difference Result 18 states and 19 transitions. [2023-11-06 20:57:47,008 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-06 20:57:47,009 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 1.6666666666666667) internal successors, (10), 6 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2023-11-06 20:57:47,009 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 20:57:47,010 INFO L225 Difference]: With dead ends: 18 [2023-11-06 20:57:47,010 INFO L226 Difference]: Without dead ends: 14 [2023-11-06 20:57:47,010 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2023-11-06 20:57:47,012 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 12 mSDsluCounter, 5 mSDsCounter, 0 mSdLazyCounter, 22 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 8 SdHoareTripleChecker+Invalid, 22 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 22 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-06 20:57:47,012 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [12 Valid, 8 Invalid, 22 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 22 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-06 20:57:47,014 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2023-11-06 20:57:47,024 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2023-11-06 20:57:47,024 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14 states, 13 states have (on average 1.1538461538461537) internal successors, (15), 13 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:57:47,024 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 15 transitions. [2023-11-06 20:57:47,025 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 15 transitions. Word has length 11 [2023-11-06 20:57:47,025 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 20:57:47,025 INFO L495 AbstractCegarLoop]: Abstraction has 14 states and 15 transitions. [2023-11-06 20:57:47,025 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 1.6666666666666667) internal successors, (10), 6 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:57:47,026 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 15 transitions. [2023-11-06 20:57:47,027 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2023-11-06 20:57:47,027 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 20:57:47,027 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 20:57:47,028 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2023-11-06 20:57:47,028 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-06 20:57:47,028 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 20:57:47,029 INFO L85 PathProgramCache]: Analyzing trace with hash -176448521, now seen corresponding path program 1 times [2023-11-06 20:57:47,029 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 20:57:47,029 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1096166596] [2023-11-06 20:57:47,029 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:57:47,030 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 20:57:47,044 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:57:47,108 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-11-06 20:57:47,108 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 20:57:47,108 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1096166596] [2023-11-06 20:57:47,109 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1096166596] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-06 20:57:47,109 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [117891339] [2023-11-06 20:57:47,109 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:57:47,109 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 20:57:47,110 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab4048c9-63b4-4f44-9ac7-fe747415a85e/bin/utaipan-verify-FOvIYxoinp/z3 [2023-11-06 20:57:47,112 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab4048c9-63b4-4f44-9ac7-fe747415a85e/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-06 20:57:47,136 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab4048c9-63b4-4f44-9ac7-fe747415a85e/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-06 20:57:47,173 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:57:47,174 INFO L262 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 4 conjunts are in the unsatisfiable core [2023-11-06 20:57:47,175 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-06 20:57:47,206 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-11-06 20:57:47,206 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-06 20:57:47,237 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-11-06 20:57:47,237 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [117891339] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-06 20:57:47,238 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [528355726] [2023-11-06 20:57:47,241 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2023-11-06 20:57:47,241 INFO L166 IcfgInterpreter]: Building call graph [2023-11-06 20:57:47,241 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-06 20:57:47,242 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-06 20:57:47,242 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-06 20:57:47,816 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-06 20:57:48,526 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '545#(and (<= 1 |#StackHeapBarrier|) (<= 0 (+ |ULTIMATE.start_main_~is_divisible1~0#1| 2147483648)) (= ~true~0 1) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 (+ |ULTIMATE.start_main_~is_divisible2~0#1| 2147483648)) (= ~false~0 0) (<= |ULTIMATE.start_main_~is_divisible1~0#1| 2147483647) (exists ((|v_ULTIMATE.start_student_version_~w#1_24| Int) (|v_ULTIMATE.start_student_version_~i~1#1_37| Int)) (and (or (and (= |ULTIMATE.start_student_version_#res#1| 1) (= |v_ULTIMATE.start_student_version_~i~1#1_37| |v_ULTIMATE.start_student_version_~w#1_24|)) (and (not (= |v_ULTIMATE.start_student_version_~i~1#1_37| |v_ULTIMATE.start_student_version_~w#1_24|)) (= |ULTIMATE.start_student_version_#res#1| 0))) (<= 4 |v_ULTIMATE.start_student_version_~w#1_24|) (<= |v_ULTIMATE.start_student_version_~w#1_24| |v_ULTIMATE.start_student_version_~i~1#1_37|))) (<= |ULTIMATE.start_main_~is_divisible2~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0) (<= 0 (+ |ULTIMATE.start_correct_version_#res#1| 2147483648)) (<= |ULTIMATE.start_correct_version_#res#1| 2147483647) (= |ULTIMATE.start_main_~is_divisible2~0#1| |ULTIMATE.start_student_version_#res#1|) (not (= |ULTIMATE.start_main_~is_divisible1~0#1| |ULTIMATE.start_main_~is_divisible2~0#1|)))' at error location [2023-11-06 20:57:48,526 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-06 20:57:48,527 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-06 20:57:48,527 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 8 [2023-11-06 20:57:48,527 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [193237751] [2023-11-06 20:57:48,527 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-06 20:57:48,527 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-11-06 20:57:48,528 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 20:57:48,528 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-11-06 20:57:48,528 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=223, Unknown=0, NotChecked=0, Total=272 [2023-11-06 20:57:48,529 INFO L87 Difference]: Start difference. First operand 14 states and 15 transitions. Second operand has 8 states, 8 states have (on average 2.25) internal successors, (18), 8 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:57:48,571 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 20:57:48,571 INFO L93 Difference]: Finished difference Result 19 states and 20 transitions. [2023-11-06 20:57:48,572 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-06 20:57:48,572 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.25) internal successors, (18), 8 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 13 [2023-11-06 20:57:48,574 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 20:57:48,574 INFO L225 Difference]: With dead ends: 19 [2023-11-06 20:57:48,575 INFO L226 Difference]: Without dead ends: 15 [2023-11-06 20:57:48,575 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 89 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=49, Invalid=223, Unknown=0, NotChecked=0, Total=272 [2023-11-06 20:57:48,576 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 0 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 28 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 28 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 28 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-06 20:57:48,577 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 17 Invalid, 28 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 28 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-06 20:57:48,578 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2023-11-06 20:57:48,593 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2023-11-06 20:57:48,594 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 14 states have (on average 1.1428571428571428) internal successors, (16), 14 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:57:48,594 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 16 transitions. [2023-11-06 20:57:48,594 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 16 transitions. Word has length 13 [2023-11-06 20:57:48,595 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 20:57:48,595 INFO L495 AbstractCegarLoop]: Abstraction has 15 states and 16 transitions. [2023-11-06 20:57:48,595 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 2.25) internal successors, (18), 8 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:57:48,595 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 16 transitions. [2023-11-06 20:57:48,596 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2023-11-06 20:57:48,596 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 20:57:48,596 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 20:57:48,607 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab4048c9-63b4-4f44-9ac7-fe747415a85e/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-11-06 20:57:48,802 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab4048c9-63b4-4f44-9ac7-fe747415a85e/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 20:57:48,803 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-06 20:57:48,804 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 20:57:48,804 INFO L85 PathProgramCache]: Analyzing trace with hash -1183826099, now seen corresponding path program 2 times [2023-11-06 20:57:48,804 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 20:57:48,804 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [956268026] [2023-11-06 20:57:48,805 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:57:48,807 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 20:57:48,820 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:57:49,122 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-06 20:57:49,122 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 20:57:49,123 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [956268026] [2023-11-06 20:57:49,123 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [956268026] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-06 20:57:49,123 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1059729833] [2023-11-06 20:57:49,123 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-06 20:57:49,123 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 20:57:49,124 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab4048c9-63b4-4f44-9ac7-fe747415a85e/bin/utaipan-verify-FOvIYxoinp/z3 [2023-11-06 20:57:49,125 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab4048c9-63b4-4f44-9ac7-fe747415a85e/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-06 20:57:49,148 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab4048c9-63b4-4f44-9ac7-fe747415a85e/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-11-06 20:57:49,194 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2023-11-06 20:57:49,195 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-06 20:57:49,196 INFO L262 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 33 conjunts are in the unsatisfiable core [2023-11-06 20:57:49,199 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-06 20:57:49,568 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-06 20:57:49,569 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-06 20:57:49,942 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-06 20:57:49,943 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1059729833] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-06 20:57:49,943 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [189592702] [2023-11-06 20:57:49,946 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2023-11-06 20:57:49,946 INFO L166 IcfgInterpreter]: Building call graph [2023-11-06 20:57:49,946 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-06 20:57:49,947 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-06 20:57:49,947 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-06 20:57:50,406 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-06 20:57:51,340 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '710#(and (<= 1 |#StackHeapBarrier|) (<= 0 (+ |ULTIMATE.start_main_~is_divisible1~0#1| 2147483648)) (= ~true~0 1) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 (+ |ULTIMATE.start_main_~is_divisible2~0#1| 2147483648)) (= ~false~0 0) (<= |ULTIMATE.start_main_~is_divisible1~0#1| 2147483647) (exists ((|v_ULTIMATE.start_student_version_~w#1_27| Int) (|v_ULTIMATE.start_student_version_~i~1#1_49| Int)) (and (<= 4 |v_ULTIMATE.start_student_version_~w#1_27|) (or (and (= |ULTIMATE.start_student_version_#res#1| 1) (= |v_ULTIMATE.start_student_version_~i~1#1_49| |v_ULTIMATE.start_student_version_~w#1_27|)) (and (not (= |v_ULTIMATE.start_student_version_~i~1#1_49| |v_ULTIMATE.start_student_version_~w#1_27|)) (= |ULTIMATE.start_student_version_#res#1| 0))) (<= |v_ULTIMATE.start_student_version_~w#1_27| |v_ULTIMATE.start_student_version_~i~1#1_49|))) (<= |ULTIMATE.start_main_~is_divisible2~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0) (<= 0 (+ |ULTIMATE.start_correct_version_#res#1| 2147483648)) (<= |ULTIMATE.start_correct_version_#res#1| 2147483647) (= |ULTIMATE.start_main_~is_divisible2~0#1| |ULTIMATE.start_student_version_#res#1|) (not (= |ULTIMATE.start_main_~is_divisible1~0#1| |ULTIMATE.start_main_~is_divisible2~0#1|)))' at error location [2023-11-06 20:57:51,340 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-06 20:57:51,340 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-06 20:57:51,340 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 27 [2023-11-06 20:57:51,340 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [578569522] [2023-11-06 20:57:51,341 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-06 20:57:51,341 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2023-11-06 20:57:51,341 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 20:57:51,342 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2023-11-06 20:57:51,343 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=164, Invalid=1096, Unknown=0, NotChecked=0, Total=1260 [2023-11-06 20:57:51,343 INFO L87 Difference]: Start difference. First operand 15 states and 16 transitions. Second operand has 27 states, 27 states have (on average 1.2962962962962963) internal successors, (35), 27 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:57:51,694 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 20:57:51,695 INFO L93 Difference]: Finished difference Result 26 states and 29 transitions. [2023-11-06 20:57:51,696 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2023-11-06 20:57:51,696 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 1.2962962962962963) internal successors, (35), 27 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 14 [2023-11-06 20:57:51,696 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 20:57:51,697 INFO L225 Difference]: With dead ends: 26 [2023-11-06 20:57:51,697 INFO L226 Difference]: Without dead ends: 22 [2023-11-06 20:57:51,698 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 739 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=228, Invalid=1578, Unknown=0, NotChecked=0, Total=1806 [2023-11-06 20:57:51,699 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 25 mSDsluCounter, 31 mSDsCounter, 0 mSdLazyCounter, 103 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 25 SdHoareTripleChecker+Valid, 35 SdHoareTripleChecker+Invalid, 104 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 103 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-06 20:57:51,699 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [25 Valid, 35 Invalid, 104 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 103 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-06 20:57:51,700 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2023-11-06 20:57:51,713 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 19. [2023-11-06 20:57:51,713 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 18 states have (on average 1.1666666666666667) internal successors, (21), 18 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:57:51,714 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 21 transitions. [2023-11-06 20:57:51,714 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 21 transitions. Word has length 14 [2023-11-06 20:57:51,714 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 20:57:51,714 INFO L495 AbstractCegarLoop]: Abstraction has 19 states and 21 transitions. [2023-11-06 20:57:51,715 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 27 states have (on average 1.2962962962962963) internal successors, (35), 27 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:57:51,715 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 21 transitions. [2023-11-06 20:57:51,716 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2023-11-06 20:57:51,716 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 20:57:51,716 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 20:57:51,728 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab4048c9-63b4-4f44-9ac7-fe747415a85e/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-11-06 20:57:51,924 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab4048c9-63b4-4f44-9ac7-fe747415a85e/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 20:57:51,924 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-06 20:57:51,925 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 20:57:51,925 INFO L85 PathProgramCache]: Analyzing trace with hash 1273266864, now seen corresponding path program 3 times [2023-11-06 20:57:51,925 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 20:57:51,925 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1852356733] [2023-11-06 20:57:51,925 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:57:51,925 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 20:57:51,940 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:57:52,332 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 1 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-06 20:57:52,332 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 20:57:52,332 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1852356733] [2023-11-06 20:57:52,332 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1852356733] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-06 20:57:52,332 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1994708825] [2023-11-06 20:57:52,332 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-11-06 20:57:52,333 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 20:57:52,333 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab4048c9-63b4-4f44-9ac7-fe747415a85e/bin/utaipan-verify-FOvIYxoinp/z3 [2023-11-06 20:57:52,334 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab4048c9-63b4-4f44-9ac7-fe747415a85e/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-06 20:57:52,368 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab4048c9-63b4-4f44-9ac7-fe747415a85e/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-11-06 20:57:52,399 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-11-06 20:57:52,399 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-06 20:57:52,400 INFO L262 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 12 conjunts are in the unsatisfiable core [2023-11-06 20:57:52,402 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-06 20:57:52,700 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-06 20:57:52,700 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-06 20:57:52,990 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-06 20:57:52,990 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1994708825] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-06 20:57:52,990 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [563529132] [2023-11-06 20:57:52,993 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2023-11-06 20:57:52,993 INFO L166 IcfgInterpreter]: Building call graph [2023-11-06 20:57:52,994 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-06 20:57:52,994 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-06 20:57:52,994 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-06 20:57:53,400 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-06 20:57:54,213 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '912#(and (<= 1 |#StackHeapBarrier|) (<= 0 (+ |ULTIMATE.start_main_~is_divisible1~0#1| 2147483648)) (= ~true~0 1) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 (+ |ULTIMATE.start_main_~is_divisible2~0#1| 2147483648)) (= ~false~0 0) (exists ((|v_ULTIMATE.start_student_version_~i~1#1_61| Int) (|v_ULTIMATE.start_student_version_~w#1_30| Int)) (and (<= 4 |v_ULTIMATE.start_student_version_~w#1_30|) (or (and (not (= |v_ULTIMATE.start_student_version_~i~1#1_61| |v_ULTIMATE.start_student_version_~w#1_30|)) (= |ULTIMATE.start_student_version_#res#1| 0)) (and (= |ULTIMATE.start_student_version_#res#1| 1) (= |v_ULTIMATE.start_student_version_~i~1#1_61| |v_ULTIMATE.start_student_version_~w#1_30|))) (<= |v_ULTIMATE.start_student_version_~w#1_30| |v_ULTIMATE.start_student_version_~i~1#1_61|))) (<= |ULTIMATE.start_main_~is_divisible1~0#1| 2147483647) (<= |ULTIMATE.start_main_~is_divisible2~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0) (<= 0 (+ |ULTIMATE.start_correct_version_#res#1| 2147483648)) (<= |ULTIMATE.start_correct_version_#res#1| 2147483647) (= |ULTIMATE.start_main_~is_divisible2~0#1| |ULTIMATE.start_student_version_#res#1|) (not (= |ULTIMATE.start_main_~is_divisible1~0#1| |ULTIMATE.start_main_~is_divisible2~0#1|)))' at error location [2023-11-06 20:57:54,214 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-06 20:57:54,214 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-06 20:57:54,214 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11, 11] total 24 [2023-11-06 20:57:54,214 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1555942049] [2023-11-06 20:57:54,214 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-06 20:57:54,215 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2023-11-06 20:57:54,215 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 20:57:54,216 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2023-11-06 20:57:54,216 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=146, Invalid=910, Unknown=0, NotChecked=0, Total=1056 [2023-11-06 20:57:54,217 INFO L87 Difference]: Start difference. First operand 19 states and 21 transitions. Second operand has 24 states, 24 states have (on average 1.3333333333333333) internal successors, (32), 24 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:57:54,577 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 20:57:54,578 INFO L93 Difference]: Finished difference Result 31 states and 33 transitions. [2023-11-06 20:57:54,578 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2023-11-06 20:57:54,578 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 1.3333333333333333) internal successors, (32), 24 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 15 [2023-11-06 20:57:54,579 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 20:57:54,579 INFO L225 Difference]: With dead ends: 31 [2023-11-06 20:57:54,579 INFO L226 Difference]: Without dead ends: 27 [2023-11-06 20:57:54,580 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 19 SyntacticMatches, 5 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 589 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=212, Invalid=1194, Unknown=0, NotChecked=0, Total=1406 [2023-11-06 20:57:54,581 INFO L413 NwaCegarLoop]: 6 mSDtfsCounter, 42 mSDsluCounter, 43 mSDsCounter, 0 mSdLazyCounter, 157 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 42 SdHoareTripleChecker+Valid, 49 SdHoareTripleChecker+Invalid, 162 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 157 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-06 20:57:54,582 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [42 Valid, 49 Invalid, 162 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 157 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-06 20:57:54,583 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2023-11-06 20:57:54,593 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 16. [2023-11-06 20:57:54,594 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 15 states have (on average 1.1333333333333333) internal successors, (17), 15 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:57:54,594 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 17 transitions. [2023-11-06 20:57:54,594 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 17 transitions. Word has length 15 [2023-11-06 20:57:54,595 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 20:57:54,595 INFO L495 AbstractCegarLoop]: Abstraction has 16 states and 17 transitions. [2023-11-06 20:57:54,595 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 1.3333333333333333) internal successors, (32), 24 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:57:54,595 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 17 transitions. [2023-11-06 20:57:54,596 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2023-11-06 20:57:54,596 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 20:57:54,596 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 20:57:54,608 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab4048c9-63b4-4f44-9ac7-fe747415a85e/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-11-06 20:57:54,802 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab4048c9-63b4-4f44-9ac7-fe747415a85e/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 20:57:54,802 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-06 20:57:54,803 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 20:57:54,803 INFO L85 PathProgramCache]: Analyzing trace with hash 1947207351, now seen corresponding path program 4 times [2023-11-06 20:57:54,803 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 20:57:54,803 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1809065447] [2023-11-06 20:57:54,803 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:57:54,803 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 20:57:54,817 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:57:55,160 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 4 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-06 20:57:55,160 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 20:57:55,161 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1809065447] [2023-11-06 20:57:55,161 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1809065447] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-06 20:57:55,161 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [946327786] [2023-11-06 20:57:55,161 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-11-06 20:57:55,161 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 20:57:55,162 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab4048c9-63b4-4f44-9ac7-fe747415a85e/bin/utaipan-verify-FOvIYxoinp/z3 [2023-11-06 20:57:55,163 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab4048c9-63b4-4f44-9ac7-fe747415a85e/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-06 20:57:55,186 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab4048c9-63b4-4f44-9ac7-fe747415a85e/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-11-06 20:57:55,219 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:57:55,220 INFO L262 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 12 conjunts are in the unsatisfiable core [2023-11-06 20:57:55,222 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-06 20:57:55,582 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-06 20:57:55,582 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-06 20:57:55,939 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-06 20:57:55,939 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [946327786] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-06 20:57:55,940 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1787051772] [2023-11-06 20:57:55,943 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2023-11-06 20:57:55,943 INFO L166 IcfgInterpreter]: Building call graph [2023-11-06 20:57:55,943 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-06 20:57:55,944 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-06 20:57:55,944 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-06 20:57:56,244 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-06 20:57:57,099 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1111#(and (<= 1 |#StackHeapBarrier|) (<= 0 (+ |ULTIMATE.start_main_~is_divisible1~0#1| 2147483648)) (= ~true~0 1) (exists ((|v_ULTIMATE.start_student_version_~i~1#1_72| Int) (|v_ULTIMATE.start_student_version_~w#1_33| Int)) (and (<= 4 |v_ULTIMATE.start_student_version_~w#1_33|) (or (and (= |ULTIMATE.start_student_version_#res#1| 1) (= |v_ULTIMATE.start_student_version_~i~1#1_72| |v_ULTIMATE.start_student_version_~w#1_33|)) (and (not (= |v_ULTIMATE.start_student_version_~i~1#1_72| |v_ULTIMATE.start_student_version_~w#1_33|)) (= |ULTIMATE.start_student_version_#res#1| 0))) (<= |v_ULTIMATE.start_student_version_~w#1_33| |v_ULTIMATE.start_student_version_~i~1#1_72|))) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 (+ |ULTIMATE.start_main_~is_divisible2~0#1| 2147483648)) (= ~false~0 0) (<= |ULTIMATE.start_main_~is_divisible1~0#1| 2147483647) (<= |ULTIMATE.start_main_~is_divisible2~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0) (<= 0 (+ |ULTIMATE.start_correct_version_#res#1| 2147483648)) (<= |ULTIMATE.start_correct_version_#res#1| 2147483647) (= |ULTIMATE.start_main_~is_divisible2~0#1| |ULTIMATE.start_student_version_#res#1|) (not (= |ULTIMATE.start_main_~is_divisible1~0#1| |ULTIMATE.start_main_~is_divisible2~0#1|)))' at error location [2023-11-06 20:57:57,099 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-06 20:57:57,099 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-06 20:57:57,099 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 23 [2023-11-06 20:57:57,100 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [99639668] [2023-11-06 20:57:57,100 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-06 20:57:57,100 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2023-11-06 20:57:57,100 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 20:57:57,101 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2023-11-06 20:57:57,102 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=135, Invalid=857, Unknown=0, NotChecked=0, Total=992 [2023-11-06 20:57:57,102 INFO L87 Difference]: Start difference. First operand 16 states and 17 transitions. Second operand has 23 states, 23 states have (on average 1.3478260869565217) internal successors, (31), 23 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:57:57,372 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 20:57:57,372 INFO L93 Difference]: Finished difference Result 27 states and 29 transitions. [2023-11-06 20:57:57,373 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2023-11-06 20:57:57,373 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.3478260869565217) internal successors, (31), 23 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 15 [2023-11-06 20:57:57,373 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 20:57:57,374 INFO L225 Difference]: With dead ends: 27 [2023-11-06 20:57:57,374 INFO L226 Difference]: Without dead ends: 17 [2023-11-06 20:57:57,375 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 19 SyntacticMatches, 5 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 520 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=193, Invalid=1139, Unknown=0, NotChecked=0, Total=1332 [2023-11-06 20:57:57,376 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 21 mSDsluCounter, 20 mSDsCounter, 0 mSdLazyCounter, 80 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 21 SdHoareTripleChecker+Valid, 23 SdHoareTripleChecker+Invalid, 83 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 80 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-06 20:57:57,376 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [21 Valid, 23 Invalid, 83 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 80 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-06 20:57:57,377 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2023-11-06 20:57:57,392 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2023-11-06 20:57:57,392 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 16 states have (on average 1.125) internal successors, (18), 16 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:57:57,393 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 18 transitions. [2023-11-06 20:57:57,393 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 18 transitions. Word has length 15 [2023-11-06 20:57:57,393 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 20:57:57,394 INFO L495 AbstractCegarLoop]: Abstraction has 17 states and 18 transitions. [2023-11-06 20:57:57,394 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 1.3478260869565217) internal successors, (31), 23 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:57:57,394 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 18 transitions. [2023-11-06 20:57:57,395 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2023-11-06 20:57:57,395 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 20:57:57,395 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 20:57:57,402 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab4048c9-63b4-4f44-9ac7-fe747415a85e/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2023-11-06 20:57:57,601 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab4048c9-63b4-4f44-9ac7-fe747415a85e/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2023-11-06 20:57:57,602 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-06 20:57:57,602 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 20:57:57,602 INFO L85 PathProgramCache]: Analyzing trace with hash 807677876, now seen corresponding path program 5 times [2023-11-06 20:57:57,602 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 20:57:57,602 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [10604732] [2023-11-06 20:57:57,603 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:57:57,603 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 20:57:57,626 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:57:58,445 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-06 20:57:58,445 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 20:57:58,445 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [10604732] [2023-11-06 20:57:58,445 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [10604732] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-06 20:57:58,445 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [932251752] [2023-11-06 20:57:58,445 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-06 20:57:58,446 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 20:57:58,446 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab4048c9-63b4-4f44-9ac7-fe747415a85e/bin/utaipan-verify-FOvIYxoinp/z3 [2023-11-06 20:57:58,447 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab4048c9-63b4-4f44-9ac7-fe747415a85e/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-06 20:57:58,480 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab4048c9-63b4-4f44-9ac7-fe747415a85e/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-11-06 20:57:58,514 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-11-06 20:57:58,514 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-06 20:57:58,516 WARN L260 TraceCheckSpWp]: Trace formula consists of 90 conjuncts, 48 conjunts are in the unsatisfiable core [2023-11-06 20:57:58,518 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-06 20:57:59,869 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-06 20:57:59,869 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-06 20:58:00,916 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-06 20:58:00,918 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [932251752] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-06 20:58:00,919 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [953685293] [2023-11-06 20:58:00,927 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2023-11-06 20:58:00,927 INFO L166 IcfgInterpreter]: Building call graph [2023-11-06 20:58:00,928 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-06 20:58:00,928 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-06 20:58:00,928 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-06 20:58:01,226 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-06 20:58:02,553 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1330#(and (<= 1 |#StackHeapBarrier|) (<= 0 (+ |ULTIMATE.start_main_~is_divisible1~0#1| 2147483648)) (exists ((|v_ULTIMATE.start_student_version_~i~1#1_85| Int) (|v_ULTIMATE.start_student_version_~w#1_36| Int)) (and (or (and (not (= |v_ULTIMATE.start_student_version_~i~1#1_85| |v_ULTIMATE.start_student_version_~w#1_36|)) (= |ULTIMATE.start_student_version_#res#1| 0)) (and (= |ULTIMATE.start_student_version_#res#1| 1) (= |v_ULTIMATE.start_student_version_~i~1#1_85| |v_ULTIMATE.start_student_version_~w#1_36|))) (<= 4 |v_ULTIMATE.start_student_version_~w#1_36|) (<= |v_ULTIMATE.start_student_version_~w#1_36| |v_ULTIMATE.start_student_version_~i~1#1_85|))) (= ~true~0 1) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 (+ |ULTIMATE.start_main_~is_divisible2~0#1| 2147483648)) (= ~false~0 0) (<= |ULTIMATE.start_main_~is_divisible1~0#1| 2147483647) (<= |ULTIMATE.start_main_~is_divisible2~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0) (<= 0 (+ |ULTIMATE.start_correct_version_#res#1| 2147483648)) (<= |ULTIMATE.start_correct_version_#res#1| 2147483647) (= |ULTIMATE.start_main_~is_divisible2~0#1| |ULTIMATE.start_student_version_#res#1|) (not (= |ULTIMATE.start_main_~is_divisible1~0#1| |ULTIMATE.start_main_~is_divisible2~0#1|)))' at error location [2023-11-06 20:58:02,553 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-06 20:58:02,553 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-06 20:58:02,553 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 40 [2023-11-06 20:58:02,553 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1889712351] [2023-11-06 20:58:02,554 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-06 20:58:02,554 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2023-11-06 20:58:02,554 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 20:58:02,556 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2023-11-06 20:58:02,557 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=168, Invalid=2184, Unknown=0, NotChecked=0, Total=2352 [2023-11-06 20:58:02,557 INFO L87 Difference]: Start difference. First operand 17 states and 18 transitions. Second operand has 40 states, 40 states have (on average 1.075) internal successors, (43), 40 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:58:03,669 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 20:58:03,670 INFO L93 Difference]: Finished difference Result 31 states and 34 transitions. [2023-11-06 20:58:03,671 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2023-11-06 20:58:03,671 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 1.075) internal successors, (43), 40 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 16 [2023-11-06 20:58:03,671 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 20:58:03,671 INFO L225 Difference]: With dead ends: 31 [2023-11-06 20:58:03,672 INFO L226 Difference]: Without dead ends: 18 [2023-11-06 20:58:03,673 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 801 ImplicationChecksByTransitivity, 3.8s TimeCoverageRelationStatistics Valid=240, Invalid=3066, Unknown=0, NotChecked=0, Total=3306 [2023-11-06 20:58:03,674 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 23 mSDsluCounter, 46 mSDsCounter, 0 mSdLazyCounter, 416 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 23 SdHoareTripleChecker+Valid, 48 SdHoareTripleChecker+Invalid, 421 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 416 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-11-06 20:58:03,674 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [23 Valid, 48 Invalid, 421 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 416 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-11-06 20:58:03,675 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2023-11-06 20:58:03,684 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2023-11-06 20:58:03,684 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18 states, 17 states have (on average 1.1176470588235294) internal successors, (19), 17 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:58:03,685 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2023-11-06 20:58:03,685 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 16 [2023-11-06 20:58:03,685 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 20:58:03,685 INFO L495 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2023-11-06 20:58:03,685 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 40 states, 40 states have (on average 1.075) internal successors, (43), 40 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:58:03,686 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2023-11-06 20:58:03,686 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2023-11-06 20:58:03,686 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 20:58:03,686 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 20:58:03,697 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab4048c9-63b4-4f44-9ac7-fe747415a85e/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2023-11-06 20:58:03,891 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab4048c9-63b4-4f44-9ac7-fe747415a85e/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 20:58:03,892 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-06 20:58:03,892 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 20:58:03,892 INFO L85 PathProgramCache]: Analyzing trace with hash -157997481, now seen corresponding path program 6 times [2023-11-06 20:58:03,892 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 20:58:03,893 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1302253075] [2023-11-06 20:58:03,893 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:58:03,893 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 20:58:03,901 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:58:04,299 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 3 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-06 20:58:04,299 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 20:58:04,299 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1302253075] [2023-11-06 20:58:04,299 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1302253075] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-06 20:58:04,299 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [695234693] [2023-11-06 20:58:04,299 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-11-06 20:58:04,300 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 20:58:04,300 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab4048c9-63b4-4f44-9ac7-fe747415a85e/bin/utaipan-verify-FOvIYxoinp/z3 [2023-11-06 20:58:04,301 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab4048c9-63b4-4f44-9ac7-fe747415a85e/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-06 20:58:04,305 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab4048c9-63b4-4f44-9ac7-fe747415a85e/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-11-06 20:58:04,361 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-11-06 20:58:04,361 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-06 20:58:04,362 INFO L262 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 14 conjunts are in the unsatisfiable core [2023-11-06 20:58:04,364 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-06 20:58:04,756 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 6 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-06 20:58:04,756 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-06 20:58:05,088 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 10 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-06 20:58:05,088 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [695234693] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-06 20:58:05,088 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1501542439] [2023-11-06 20:58:05,090 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2023-11-06 20:58:05,090 INFO L166 IcfgInterpreter]: Building call graph [2023-11-06 20:58:05,091 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-06 20:58:05,091 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-06 20:58:05,091 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-06 20:58:05,346 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-06 20:58:06,221 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1561#(and (<= 1 |#StackHeapBarrier|) (<= 0 (+ |ULTIMATE.start_main_~is_divisible1~0#1| 2147483648)) (exists ((|v_ULTIMATE.start_student_version_~i~1#1_98| Int) (|v_ULTIMATE.start_student_version_~w#1_39| Int)) (and (<= |v_ULTIMATE.start_student_version_~w#1_39| |v_ULTIMATE.start_student_version_~i~1#1_98|) (<= 4 |v_ULTIMATE.start_student_version_~w#1_39|) (or (and (not (= |v_ULTIMATE.start_student_version_~i~1#1_98| |v_ULTIMATE.start_student_version_~w#1_39|)) (= |ULTIMATE.start_student_version_#res#1| 0)) (and (= |v_ULTIMATE.start_student_version_~i~1#1_98| |v_ULTIMATE.start_student_version_~w#1_39|) (= |ULTIMATE.start_student_version_#res#1| 1))))) (= ~true~0 1) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 (+ |ULTIMATE.start_main_~is_divisible2~0#1| 2147483648)) (= ~false~0 0) (<= |ULTIMATE.start_main_~is_divisible1~0#1| 2147483647) (<= |ULTIMATE.start_main_~is_divisible2~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0) (<= 0 (+ |ULTIMATE.start_correct_version_#res#1| 2147483648)) (<= |ULTIMATE.start_correct_version_#res#1| 2147483647) (= |ULTIMATE.start_main_~is_divisible2~0#1| |ULTIMATE.start_student_version_#res#1|) (not (= |ULTIMATE.start_main_~is_divisible1~0#1| |ULTIMATE.start_main_~is_divisible2~0#1|)))' at error location [2023-11-06 20:58:06,222 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-06 20:58:06,222 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-06 20:58:06,222 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13, 13] total 29 [2023-11-06 20:58:06,222 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [480015605] [2023-11-06 20:58:06,222 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-06 20:58:06,223 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2023-11-06 20:58:06,223 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 20:58:06,223 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2023-11-06 20:58:06,224 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=196, Invalid=1210, Unknown=0, NotChecked=0, Total=1406 [2023-11-06 20:58:06,225 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand has 29 states, 29 states have (on average 1.2758620689655173) internal successors, (37), 29 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:58:06,561 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 20:58:06,562 INFO L93 Difference]: Finished difference Result 23 states and 24 transitions. [2023-11-06 20:58:06,565 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2023-11-06 20:58:06,565 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 1.2758620689655173) internal successors, (37), 29 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 17 [2023-11-06 20:58:06,566 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 20:58:06,566 INFO L225 Difference]: With dead ends: 23 [2023-11-06 20:58:06,566 INFO L226 Difference]: Without dead ends: 19 [2023-11-06 20:58:06,568 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 21 SyntacticMatches, 6 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 852 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=290, Invalid=1602, Unknown=0, NotChecked=0, Total=1892 [2023-11-06 20:58:06,569 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 26 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 94 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 26 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 95 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 94 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-06 20:58:06,569 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [26 Valid, 17 Invalid, 95 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 94 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-06 20:58:06,570 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2023-11-06 20:58:06,582 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2023-11-06 20:58:06,582 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 18 states have (on average 1.1111111111111112) internal successors, (20), 18 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:58:06,583 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 20 transitions. [2023-11-06 20:58:06,583 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 20 transitions. Word has length 17 [2023-11-06 20:58:06,583 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 20:58:06,583 INFO L495 AbstractCegarLoop]: Abstraction has 19 states and 20 transitions. [2023-11-06 20:58:06,584 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 29 states have (on average 1.2758620689655173) internal successors, (37), 29 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:58:06,584 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 20 transitions. [2023-11-06 20:58:06,584 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2023-11-06 20:58:06,585 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 20:58:06,585 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 20:58:06,593 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab4048c9-63b4-4f44-9ac7-fe747415a85e/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Ended with exit code 0 [2023-11-06 20:58:06,788 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab4048c9-63b4-4f44-9ac7-fe747415a85e/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 20:58:06,788 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-06 20:58:06,789 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 20:58:06,789 INFO L85 PathProgramCache]: Analyzing trace with hash -611843859, now seen corresponding path program 7 times [2023-11-06 20:58:06,789 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 20:58:06,789 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1839600785] [2023-11-06 20:58:06,789 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:58:06,789 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 20:58:06,800 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat