./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/loop-acceleration/nested_1-1.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 9bd2c7ff Calling Ultimate with: /usr/lib/jvm/java-11-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_10921cf2-56d6-4af9-af4d-bfeb25855ed7/bin/utaipan-verify-t7M7D8N6sZ/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_10921cf2-56d6-4af9-af4d-bfeb25855ed7/bin/utaipan-verify-t7M7D8N6sZ/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_10921cf2-56d6-4af9-af4d-bfeb25855ed7/bin/utaipan-verify-t7M7D8N6sZ/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_10921cf2-56d6-4af9-af4d-bfeb25855ed7/bin/utaipan-verify-t7M7D8N6sZ/config/TaipanReach.xml -i ../../sv-benchmarks/c/loop-acceleration/nested_1-1.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_10921cf2-56d6-4af9-af4d-bfeb25855ed7/bin/utaipan-verify-t7M7D8N6sZ/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_10921cf2-56d6-4af9-af4d-bfeb25855ed7/bin/utaipan-verify-t7M7D8N6sZ --witnessprinter.witness.filename witness --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 7d46306d0f449fc697e3921b4f35c60335f25019c8462cefcaf92538159e3d14 --- Real Ultimate output --- This is Ultimate 0.2.3-dev-9bd2c7f [2023-11-19 04:59:11,256 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-19 04:59:11,364 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_10921cf2-56d6-4af9-af4d-bfeb25855ed7/bin/utaipan-verify-t7M7D8N6sZ/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-11-19 04:59:11,372 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-19 04:59:11,373 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-19 04:59:11,421 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-19 04:59:11,422 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-19 04:59:11,422 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-19 04:59:11,424 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-19 04:59:11,429 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-19 04:59:11,429 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-19 04:59:11,430 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-19 04:59:11,431 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-19 04:59:11,432 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-19 04:59:11,433 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-19 04:59:11,433 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-19 04:59:11,434 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-19 04:59:11,434 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-19 04:59:11,435 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-19 04:59:11,435 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-19 04:59:11,436 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-19 04:59:11,436 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-19 04:59:11,437 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-19 04:59:11,438 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-11-19 04:59:11,438 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-19 04:59:11,439 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-19 04:59:11,439 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-19 04:59:11,440 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-19 04:59:11,440 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-11-19 04:59:11,440 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-19 04:59:11,442 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-11-19 04:59:11,442 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-19 04:59:11,442 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-11-19 04:59:11,443 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-19 04:59:11,443 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-19 04:59:11,443 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-19 04:59:11,443 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-19 04:59:11,444 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-19 04:59:11,444 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-19 04:59:11,444 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-11-19 04:59:11,445 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-19 04:59:11,445 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-19 04:59:11,445 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-11-19 04:59:11,446 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-19 04:59:11,446 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-19 04:59:11,446 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_10921cf2-56d6-4af9-af4d-bfeb25855ed7/bin/utaipan-verify-t7M7D8N6sZ/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_10921cf2-56d6-4af9-af4d-bfeb25855ed7/bin/utaipan-verify-t7M7D8N6sZ Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 7d46306d0f449fc697e3921b4f35c60335f25019c8462cefcaf92538159e3d14 [2023-11-19 04:59:11,765 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-19 04:59:11,785 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-19 04:59:11,788 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-19 04:59:11,789 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-19 04:59:11,790 INFO L274 PluginConnector]: CDTParser initialized [2023-11-19 04:59:11,791 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_10921cf2-56d6-4af9-af4d-bfeb25855ed7/bin/utaipan-verify-t7M7D8N6sZ/../../sv-benchmarks/c/loop-acceleration/nested_1-1.c [2023-11-19 04:59:14,924 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-19 04:59:15,106 INFO L384 CDTParser]: Found 1 translation units. [2023-11-19 04:59:15,107 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_10921cf2-56d6-4af9-af4d-bfeb25855ed7/sv-benchmarks/c/loop-acceleration/nested_1-1.c [2023-11-19 04:59:15,114 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_10921cf2-56d6-4af9-af4d-bfeb25855ed7/bin/utaipan-verify-t7M7D8N6sZ/data/4f6864720/9c956bfd6b1e4583a514bad2eeceef6f/FLAG88147342c [2023-11-19 04:59:15,129 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_10921cf2-56d6-4af9-af4d-bfeb25855ed7/bin/utaipan-verify-t7M7D8N6sZ/data/4f6864720/9c956bfd6b1e4583a514bad2eeceef6f [2023-11-19 04:59:15,132 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-19 04:59:15,133 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-19 04:59:15,135 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-19 04:59:15,135 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-19 04:59:15,140 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-19 04:59:15,141 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 04:59:15" (1/1) ... [2023-11-19 04:59:15,142 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2ae7abe2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:59:15, skipping insertion in model container [2023-11-19 04:59:15,142 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 04:59:15" (1/1) ... [2023-11-19 04:59:15,161 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-19 04:59:15,309 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_10921cf2-56d6-4af9-af4d-bfeb25855ed7/sv-benchmarks/c/loop-acceleration/nested_1-1.c[322,335] [2023-11-19 04:59:15,322 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-19 04:59:15,331 INFO L202 MainTranslator]: Completed pre-run [2023-11-19 04:59:15,344 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_10921cf2-56d6-4af9-af4d-bfeb25855ed7/sv-benchmarks/c/loop-acceleration/nested_1-1.c[322,335] [2023-11-19 04:59:15,347 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-19 04:59:15,361 INFO L206 MainTranslator]: Completed translation [2023-11-19 04:59:15,361 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:59:15 WrapperNode [2023-11-19 04:59:15,361 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-19 04:59:15,363 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-19 04:59:15,363 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-19 04:59:15,363 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-19 04:59:15,371 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:59:15" (1/1) ... [2023-11-19 04:59:15,378 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:59:15" (1/1) ... [2023-11-19 04:59:15,398 INFO L138 Inliner]: procedures = 12, calls = 8, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 33 [2023-11-19 04:59:15,399 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-19 04:59:15,400 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-19 04:59:15,400 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-19 04:59:15,400 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-19 04:59:15,409 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:59:15" (1/1) ... [2023-11-19 04:59:15,410 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:59:15" (1/1) ... [2023-11-19 04:59:15,413 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:59:15" (1/1) ... [2023-11-19 04:59:15,414 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:59:15" (1/1) ... [2023-11-19 04:59:15,422 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:59:15" (1/1) ... [2023-11-19 04:59:15,426 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:59:15" (1/1) ... [2023-11-19 04:59:15,427 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:59:15" (1/1) ... [2023-11-19 04:59:15,429 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:59:15" (1/1) ... [2023-11-19 04:59:15,436 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-19 04:59:15,437 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-19 04:59:15,437 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-19 04:59:15,438 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-19 04:59:15,439 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:59:15" (1/1) ... [2023-11-19 04:59:15,445 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-19 04:59:15,459 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_10921cf2-56d6-4af9-af4d-bfeb25855ed7/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 04:59:15,478 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_10921cf2-56d6-4af9-af4d-bfeb25855ed7/bin/utaipan-verify-t7M7D8N6sZ/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-19 04:59:15,513 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_10921cf2-56d6-4af9-af4d-bfeb25855ed7/bin/utaipan-verify-t7M7D8N6sZ/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-19 04:59:15,529 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-19 04:59:15,529 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-19 04:59:15,529 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-19 04:59:15,530 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-19 04:59:15,599 INFO L236 CfgBuilder]: Building ICFG [2023-11-19 04:59:15,602 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-19 04:59:15,786 INFO L277 CfgBuilder]: Performing block encoding [2023-11-19 04:59:15,834 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-19 04:59:15,835 INFO L302 CfgBuilder]: Removed 2 assume(true) statements. [2023-11-19 04:59:15,839 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 04:59:15 BoogieIcfgContainer [2023-11-19 04:59:15,840 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-19 04:59:15,844 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-19 04:59:15,844 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-19 04:59:15,848 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-19 04:59:15,848 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 19.11 04:59:15" (1/3) ... [2023-11-19 04:59:15,849 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@68616e3c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 04:59:15, skipping insertion in model container [2023-11-19 04:59:15,849 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:59:15" (2/3) ... [2023-11-19 04:59:15,851 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@68616e3c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 04:59:15, skipping insertion in model container [2023-11-19 04:59:15,851 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 04:59:15" (3/3) ... [2023-11-19 04:59:15,853 INFO L112 eAbstractionObserver]: Analyzing ICFG nested_1-1.c [2023-11-19 04:59:15,873 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-19 04:59:15,873 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-11-19 04:59:15,939 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-19 04:59:15,948 INFO L357 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopHeads, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mPorIndependenceSettings=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@7bb66cf7, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-19 04:59:15,950 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-11-19 04:59:15,954 INFO L276 IsEmpty]: Start isEmpty. Operand has 8 states, 6 states have (on average 1.6666666666666667) internal successors, (10), 7 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) [2023-11-19 04:59:15,959 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2023-11-19 04:59:15,960 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 04:59:15,962 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1] [2023-11-19 04:59:15,963 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 04:59:15,971 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 04:59:15,972 INFO L85 PathProgramCache]: Analyzing trace with hash 2252617, now seen corresponding path program 1 times [2023-11-19 04:59:15,982 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 04:59:15,983 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [41925814] [2023-11-19 04:59:15,984 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 04:59:15,984 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 04:59:16,108 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 04:59:16,282 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 04:59:16,285 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 04:59:16,286 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [41925814] [2023-11-19 04:59:16,286 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [41925814] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 04:59:16,287 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-19 04:59:16,287 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-19 04:59:16,289 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1066424587] [2023-11-19 04:59:16,290 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 04:59:16,295 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-19 04:59:16,297 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 04:59:16,346 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-19 04:59:16,347 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-19 04:59:16,350 INFO L87 Difference]: Start difference. First operand has 8 states, 6 states have (on average 1.6666666666666667) internal successors, (10), 7 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) Second operand has 3 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 2 states have internal predecessors, (4), 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) [2023-11-19 04:59:16,393 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 04:59:16,393 INFO L93 Difference]: Finished difference Result 15 states and 19 transitions. [2023-11-19 04:59:16,394 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-19 04:59:16,395 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 2 states have internal predecessors, (4), 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 4 [2023-11-19 04:59:16,396 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 04:59:16,402 INFO L225 Difference]: With dead ends: 15 [2023-11-19 04:59:16,402 INFO L226 Difference]: Without dead ends: 8 [2023-11-19 04:59:16,404 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-19 04:59:16,408 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 2 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 9 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 8 SdHoareTripleChecker+Invalid, 9 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 9 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-19 04:59:16,409 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 8 Invalid, 9 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 9 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-19 04:59:16,423 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8 states. [2023-11-19 04:59:16,431 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8 to 7. [2023-11-19 04:59:16,432 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 7 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) [2023-11-19 04:59:16,433 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7 states to 7 states and 8 transitions. [2023-11-19 04:59:16,434 INFO L78 Accepts]: Start accepts. Automaton has 7 states and 8 transitions. Word has length 4 [2023-11-19 04:59:16,434 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 04:59:16,435 INFO L495 AbstractCegarLoop]: Abstraction has 7 states and 8 transitions. [2023-11-19 04:59:16,435 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 2 states have internal predecessors, (4), 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) [2023-11-19 04:59:16,435 INFO L276 IsEmpty]: Start isEmpty. Operand 7 states and 8 transitions. [2023-11-19 04:59:16,435 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2023-11-19 04:59:16,436 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 04:59:16,436 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2023-11-19 04:59:16,436 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-19 04:59:16,436 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 04:59:16,437 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 04:59:16,437 INFO L85 PathProgramCache]: Analyzing trace with hash 2130164165, now seen corresponding path program 1 times [2023-11-19 04:59:16,437 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 04:59:16,438 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1401571091] [2023-11-19 04:59:16,438 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 04:59:16,438 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 04:59:16,452 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 04:59:16,504 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 04:59:16,505 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 04:59:16,505 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1401571091] [2023-11-19 04:59:16,505 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1401571091] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 04:59:16,505 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-19 04:59:16,506 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-19 04:59:16,506 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [954970339] [2023-11-19 04:59:16,506 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 04:59:16,507 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-19 04:59:16,507 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 04:59:16,508 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-19 04:59:16,508 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-19 04:59:16,509 INFO L87 Difference]: Start difference. First operand 7 states and 8 transitions. Second operand has 3 states, 3 states have (on average 2.0) internal successors, (6), 3 states have internal predecessors, (6), 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) [2023-11-19 04:59:16,524 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 04:59:16,525 INFO L93 Difference]: Finished difference Result 13 states and 16 transitions. [2023-11-19 04:59:16,525 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-19 04:59:16,525 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.0) internal successors, (6), 3 states have internal predecessors, (6), 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 6 [2023-11-19 04:59:16,526 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 04:59:16,526 INFO L225 Difference]: With dead ends: 13 [2023-11-19 04:59:16,526 INFO L226 Difference]: Without dead ends: 8 [2023-11-19 04:59:16,527 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 [2023-11-19 04:59:16,528 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 0 mSDsluCounter, 2 mSDsCounter, 0 mSdLazyCounter, 7 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 5 SdHoareTripleChecker+Invalid, 8 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 7 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-19 04:59:16,529 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 5 Invalid, 8 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 7 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-19 04:59:16,530 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8 states. [2023-11-19 04:59:16,532 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8 to 8. [2023-11-19 04:59:16,532 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 8 states, 7 states have (on average 1.2857142857142858) internal successors, (9), 7 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) [2023-11-19 04:59:16,533 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8 states to 8 states and 9 transitions. [2023-11-19 04:59:16,533 INFO L78 Accepts]: Start accepts. Automaton has 8 states and 9 transitions. Word has length 6 [2023-11-19 04:59:16,533 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 04:59:16,533 INFO L495 AbstractCegarLoop]: Abstraction has 8 states and 9 transitions. [2023-11-19 04:59:16,533 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.0) internal successors, (6), 3 states have internal predecessors, (6), 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) [2023-11-19 04:59:16,534 INFO L276 IsEmpty]: Start isEmpty. Operand 8 states and 9 transitions. [2023-11-19 04:59:16,534 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2023-11-19 04:59:16,534 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 04:59:16,534 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2023-11-19 04:59:16,534 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-11-19 04:59:16,535 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 04:59:16,535 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 04:59:16,535 INFO L85 PathProgramCache]: Analyzing trace with hash 1585602295, now seen corresponding path program 1 times [2023-11-19 04:59:16,536 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 04:59:16,536 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2075163222] [2023-11-19 04:59:16,536 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 04:59:16,536 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 04:59:16,550 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 04:59:16,665 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 04:59:16,666 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 04:59:16,666 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2075163222] [2023-11-19 04:59:16,666 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2075163222] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 04:59:16,667 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2138382273] [2023-11-19 04:59:16,667 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 04:59:16,667 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 04:59:16,667 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_10921cf2-56d6-4af9-af4d-bfeb25855ed7/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 04:59:16,669 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_10921cf2-56d6-4af9-af4d-bfeb25855ed7/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 04:59:16,705 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_10921cf2-56d6-4af9-af4d-bfeb25855ed7/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-19 04:59:16,765 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 04:59:16,767 INFO L262 TraceCheckSpWp]: Trace formula consists of 42 conjuncts, 9 conjunts are in the unsatisfiable core [2023-11-19 04:59:16,772 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 04:59:16,832 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 04:59:16,833 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 04:59:16,868 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 04:59:16,868 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2138382273] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 04:59:16,869 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1209247120] [2023-11-19 04:59:16,888 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2023-11-19 04:59:16,888 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 04:59:16,891 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 04:59:16,896 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 04:59:16,897 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 04:59:17,575 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-19 04:59:17,686 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '122#(and (<= 1 |#StackHeapBarrier|) (<= 268435455 (mod |ULTIMATE.start_main_~x~0#1| 4294967296)) (<= 0 |ULTIMATE.start_main_~y~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (mod |ULTIMATE.start_main_~x~0#1| 2) 0) (<= 1 |ULTIMATE.start_main_~x~0#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-11-19 04:59:17,687 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-19 04:59:17,687 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-19 04:59:17,687 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 9 [2023-11-19 04:59:17,687 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1591887867] [2023-11-19 04:59:17,687 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-19 04:59:17,688 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2023-11-19 04:59:17,688 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 04:59:17,689 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2023-11-19 04:59:17,689 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=94, Unknown=0, NotChecked=0, Total=132 [2023-11-19 04:59:17,689 INFO L87 Difference]: Start difference. First operand 8 states and 9 transitions. Second operand has 9 states, 9 states have (on average 1.5555555555555556) internal successors, (14), 9 states have internal predecessors, (14), 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) [2023-11-19 04:59:17,780 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 04:59:17,780 INFO L93 Difference]: Finished difference Result 22 states and 31 transitions. [2023-11-19 04:59:17,780 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2023-11-19 04:59:17,781 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 1.5555555555555556) internal successors, (14), 9 states have internal predecessors, (14), 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 7 [2023-11-19 04:59:17,781 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 04:59:17,782 INFO L225 Difference]: With dead ends: 22 [2023-11-19 04:59:17,783 INFO L226 Difference]: Without dead ends: 16 [2023-11-19 04:59:17,785 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 42 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=61, Invalid=149, Unknown=0, NotChecked=0, Total=210 [2023-11-19 04:59:17,789 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 4 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 24 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 8 SdHoareTripleChecker+Invalid, 28 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 24 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-19 04:59:17,791 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [4 Valid, 8 Invalid, 28 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 24 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-19 04:59:17,793 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2023-11-19 04:59:17,800 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 11. [2023-11-19 04:59:17,800 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 11 states, 10 states have (on average 1.2) internal successors, (12), 10 states have internal predecessors, (12), 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) [2023-11-19 04:59:17,801 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 12 transitions. [2023-11-19 04:59:17,802 INFO L78 Accepts]: Start accepts. Automaton has 11 states and 12 transitions. Word has length 7 [2023-11-19 04:59:17,802 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 04:59:17,802 INFO L495 AbstractCegarLoop]: Abstraction has 11 states and 12 transitions. [2023-11-19 04:59:17,803 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 1.5555555555555556) internal successors, (14), 9 states have internal predecessors, (14), 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) [2023-11-19 04:59:17,803 INFO L276 IsEmpty]: Start isEmpty. Operand 11 states and 12 transitions. [2023-11-19 04:59:17,804 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2023-11-19 04:59:17,804 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 04:59:17,804 INFO L195 NwaCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1] [2023-11-19 04:59:17,831 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_10921cf2-56d6-4af9-af4d-bfeb25855ed7/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-11-19 04:59:18,026 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_10921cf2-56d6-4af9-af4d-bfeb25855ed7/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 04:59:18,027 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 04:59:18,027 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 04:59:18,028 INFO L85 PathProgramCache]: Analyzing trace with hash 1594914373, now seen corresponding path program 2 times [2023-11-19 04:59:18,028 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 04:59:18,028 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1183334399] [2023-11-19 04:59:18,028 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 04:59:18,029 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 04:59:18,051 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 04:59:18,308 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 1 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 04:59:18,309 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 04:59:18,309 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1183334399] [2023-11-19 04:59:18,309 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1183334399] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 04:59:18,310 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1598223901] [2023-11-19 04:59:18,310 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-19 04:59:18,310 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 04:59:18,320 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_10921cf2-56d6-4af9-af4d-bfeb25855ed7/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 04:59:18,321 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_10921cf2-56d6-4af9-af4d-bfeb25855ed7/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 04:59:18,347 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_10921cf2-56d6-4af9-af4d-bfeb25855ed7/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-19 04:59:18,377 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2023-11-19 04:59:18,378 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-19 04:59:18,379 INFO L262 TraceCheckSpWp]: Trace formula consists of 39 conjuncts, 10 conjunts are in the unsatisfiable core [2023-11-19 04:59:18,381 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 04:59:18,430 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-11-19 04:59:18,430 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 04:59:18,496 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-11-19 04:59:18,497 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1598223901] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 04:59:18,497 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [309674827] [2023-11-19 04:59:18,500 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2023-11-19 04:59:18,500 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 04:59:18,501 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 04:59:18,501 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 04:59:18,501 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 04:59:18,974 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-19 04:59:19,110 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '253#(and (<= 1 |#StackHeapBarrier|) (<= 268435455 (mod |ULTIMATE.start_main_~x~0#1| 4294967296)) (<= 0 |ULTIMATE.start_main_~y~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (mod |ULTIMATE.start_main_~x~0#1| 2) 0) (<= 1 |ULTIMATE.start_main_~x~0#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-11-19 04:59:19,110 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-19 04:59:19,111 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-19 04:59:19,111 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 4, 4] total 13 [2023-11-19 04:59:19,111 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [473776246] [2023-11-19 04:59:19,111 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-19 04:59:19,113 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2023-11-19 04:59:19,113 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 04:59:19,114 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2023-11-19 04:59:19,115 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=200, Unknown=0, NotChecked=0, Total=240 [2023-11-19 04:59:19,116 INFO L87 Difference]: Start difference. First operand 11 states and 12 transitions. Second operand has 13 states, 13 states have (on average 1.6923076923076923) internal successors, (22), 13 states have internal predecessors, (22), 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) [2023-11-19 04:59:19,649 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 04:59:19,649 INFO L93 Difference]: Finished difference Result 42 states and 53 transitions. [2023-11-19 04:59:19,650 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2023-11-19 04:59:19,650 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.6923076923076923) internal successors, (22), 13 states have internal predecessors, (22), 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 [2023-11-19 04:59:19,650 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 04:59:19,651 INFO L225 Difference]: With dead ends: 42 [2023-11-19 04:59:19,651 INFO L226 Difference]: Without dead ends: 32 [2023-11-19 04:59:19,652 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 265 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=185, Invalid=1147, Unknown=0, NotChecked=0, Total=1332 [2023-11-19 04:59:19,653 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 25 mSDsluCounter, 11 mSDsCounter, 0 mSdLazyCounter, 115 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 25 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 121 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 115 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-19 04:59:19,654 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [25 Valid, 13 Invalid, 121 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 115 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-19 04:59:19,655 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2023-11-19 04:59:19,662 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 19. [2023-11-19 04:59:19,662 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) [2023-11-19 04:59:19,663 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 21 transitions. [2023-11-19 04:59:19,663 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 21 transitions. Word has length 10 [2023-11-19 04:59:19,663 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 04:59:19,663 INFO L495 AbstractCegarLoop]: Abstraction has 19 states and 21 transitions. [2023-11-19 04:59:19,663 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 1.6923076923076923) internal successors, (22), 13 states have internal predecessors, (22), 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) [2023-11-19 04:59:19,664 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 21 transitions. [2023-11-19 04:59:19,664 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2023-11-19 04:59:19,664 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 04:59:19,664 INFO L195 NwaCegarLoop]: trace histogram [10, 2, 2, 1, 1, 1, 1] [2023-11-19 04:59:19,689 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_10921cf2-56d6-4af9-af4d-bfeb25855ed7/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-11-19 04:59:19,881 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_10921cf2-56d6-4af9-af4d-bfeb25855ed7/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 04:59:19,881 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 04:59:19,882 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 04:59:19,882 INFO L85 PathProgramCache]: Analyzing trace with hash -1663758455, now seen corresponding path program 3 times [2023-11-19 04:59:19,882 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 04:59:19,882 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [937800903] [2023-11-19 04:59:19,882 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 04:59:19,883 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 04:59:19,919 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 04:59:20,178 INFO L134 CoverageAnalysis]: Checked inductivity of 69 backedges. 38 proven. 15 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2023-11-19 04:59:20,179 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 04:59:20,179 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [937800903] [2023-11-19 04:59:20,180 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [937800903] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 04:59:20,180 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1099873424] [2023-11-19 04:59:20,181 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-11-19 04:59:20,181 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 04:59:20,181 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_10921cf2-56d6-4af9-af4d-bfeb25855ed7/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 04:59:20,182 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_10921cf2-56d6-4af9-af4d-bfeb25855ed7/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 04:59:20,208 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_10921cf2-56d6-4af9-af4d-bfeb25855ed7/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-19 04:59:20,250 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-11-19 04:59:20,251 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-19 04:59:20,252 INFO L262 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 14 conjunts are in the unsatisfiable core [2023-11-19 04:59:20,255 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 04:59:20,398 INFO L134 CoverageAnalysis]: Checked inductivity of 69 backedges. 0 proven. 51 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2023-11-19 04:59:20,402 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 04:59:20,634 INFO L134 CoverageAnalysis]: Checked inductivity of 69 backedges. 9 proven. 42 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2023-11-19 04:59:20,634 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1099873424] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 04:59:20,635 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1524387331] [2023-11-19 04:59:20,639 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2023-11-19 04:59:20,640 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 04:59:20,641 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 04:59:20,641 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 04:59:20,641 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 04:59:21,043 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-19 04:59:21,220 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '531#(and (<= 1 |#StackHeapBarrier|) (<= 268435455 (mod |ULTIMATE.start_main_~x~0#1| 4294967296)) (<= 0 |ULTIMATE.start_main_~y~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (mod |ULTIMATE.start_main_~x~0#1| 2) 0) (<= 1 |ULTIMATE.start_main_~x~0#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-11-19 04:59:21,220 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-19 04:59:21,220 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-19 04:59:21,221 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7, 7] total 20 [2023-11-19 04:59:21,221 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [436106791] [2023-11-19 04:59:21,221 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-19 04:59:21,221 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2023-11-19 04:59:21,222 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 04:59:21,222 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2023-11-19 04:59:21,223 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=99, Invalid=407, Unknown=0, NotChecked=0, Total=506 [2023-11-19 04:59:21,223 INFO L87 Difference]: Start difference. First operand 19 states and 21 transitions. Second operand has 20 states, 20 states have (on average 1.8) internal successors, (36), 20 states have internal predecessors, (36), 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) [2023-11-19 04:59:22,413 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 04:59:22,413 INFO L93 Difference]: Finished difference Result 78 states and 96 transitions. [2023-11-19 04:59:22,415 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2023-11-19 04:59:22,415 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 1.8) internal successors, (36), 20 states have internal predecessors, (36), 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 18 [2023-11-19 04:59:22,415 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 04:59:22,417 INFO L225 Difference]: With dead ends: 78 [2023-11-19 04:59:22,418 INFO L226 Difference]: Without dead ends: 61 [2023-11-19 04:59:22,420 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 39 SyntacticMatches, 0 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 988 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=686, Invalid=2854, Unknown=0, NotChecked=0, Total=3540 [2023-11-19 04:59:22,421 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 39 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 261 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 39 SdHoareTripleChecker+Valid, 20 SdHoareTripleChecker+Invalid, 269 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 261 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-19 04:59:22,424 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [39 Valid, 20 Invalid, 269 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 261 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-19 04:59:22,425 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2023-11-19 04:59:22,453 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 53. [2023-11-19 04:59:22,454 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 53 states, 52 states have (on average 1.1346153846153846) internal successors, (59), 52 states have internal predecessors, (59), 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) [2023-11-19 04:59:22,460 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 59 transitions. [2023-11-19 04:59:22,460 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 59 transitions. Word has length 18 [2023-11-19 04:59:22,461 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 04:59:22,461 INFO L495 AbstractCegarLoop]: Abstraction has 53 states and 59 transitions. [2023-11-19 04:59:22,461 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 1.8) internal successors, (36), 20 states have internal predecessors, (36), 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) [2023-11-19 04:59:22,461 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 59 transitions. [2023-11-19 04:59:22,463 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2023-11-19 04:59:22,463 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 04:59:22,464 INFO L195 NwaCegarLoop]: trace histogram [36, 6, 6, 1, 1, 1, 1] [2023-11-19 04:59:22,484 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_10921cf2-56d6-4af9-af4d-bfeb25855ed7/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-11-19 04:59:22,673 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_10921cf2-56d6-4af9-af4d-bfeb25855ed7/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 04:59:22,673 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 04:59:22,674 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 04:59:22,674 INFO L85 PathProgramCache]: Analyzing trace with hash -140031311, now seen corresponding path program 4 times [2023-11-19 04:59:22,674 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 04:59:22,674 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [66663360] [2023-11-19 04:59:22,674 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 04:59:22,675 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 04:59:22,741 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 04:59:23,038 INFO L134 CoverageAnalysis]: Checked inductivity of 882 backedges. 251 proven. 21 refuted. 0 times theorem prover too weak. 610 trivial. 0 not checked. [2023-11-19 04:59:23,038 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 04:59:23,038 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [66663360] [2023-11-19 04:59:23,038 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [66663360] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 04:59:23,039 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2117034794] [2023-11-19 04:59:23,039 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-11-19 04:59:23,039 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 04:59:23,039 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_10921cf2-56d6-4af9-af4d-bfeb25855ed7/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 04:59:23,041 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_10921cf2-56d6-4af9-af4d-bfeb25855ed7/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 04:59:23,067 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_10921cf2-56d6-4af9-af4d-bfeb25855ed7/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-11-19 04:59:23,163 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 04:59:23,166 INFO L262 TraceCheckSpWp]: Trace formula consists of 177 conjuncts, 43 conjunts are in the unsatisfiable core [2023-11-19 04:59:23,169 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 04:59:23,569 INFO L134 CoverageAnalysis]: Checked inductivity of 882 backedges. 0 proven. 798 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2023-11-19 04:59:23,570 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 04:59:23,922 INFO L134 CoverageAnalysis]: Checked inductivity of 882 backedges. 0 proven. 756 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2023-11-19 04:59:23,923 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2117034794] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 04:59:23,923 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [206886004] [2023-11-19 04:59:23,926 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2023-11-19 04:59:23,926 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 04:59:23,926 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 04:59:23,927 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 04:59:23,927 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 04:59:24,242 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-19 04:59:24,471 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1200#(and (<= 1 |#StackHeapBarrier|) (<= 268435455 (mod |ULTIMATE.start_main_~x~0#1| 4294967296)) (<= 0 |ULTIMATE.start_main_~y~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (mod |ULTIMATE.start_main_~x~0#1| 2) 0) (<= 1 |ULTIMATE.start_main_~x~0#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-11-19 04:59:24,471 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-19 04:59:24,471 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-19 04:59:24,472 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 20, 8] total 35 [2023-11-19 04:59:24,472 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [109939022] [2023-11-19 04:59:24,472 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-19 04:59:24,475 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2023-11-19 04:59:24,475 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 04:59:24,477 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2023-11-19 04:59:24,477 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=251, Invalid=1155, Unknown=0, NotChecked=0, Total=1406 [2023-11-19 04:59:24,478 INFO L87 Difference]: Start difference. First operand 53 states and 59 transitions. Second operand has 35 states, 35 states have (on average 1.8571428571428572) internal successors, (65), 35 states have internal predecessors, (65), 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) [2023-11-19 04:59:29,932 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 04:59:29,933 INFO L93 Difference]: Finished difference Result 184 states and 223 transitions. [2023-11-19 04:59:29,933 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 114 states. [2023-11-19 04:59:29,934 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 1.8571428571428572) internal successors, (65), 35 states have internal predecessors, (65), 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 52 [2023-11-19 04:59:29,934 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 04:59:29,936 INFO L225 Difference]: With dead ends: 184 [2023-11-19 04:59:29,936 INFO L226 Difference]: Without dead ends: 140 [2023-11-19 04:59:29,945 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 255 GetRequests, 127 SyntacticMatches, 0 SemanticMatches, 128 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6131 ImplicationChecksByTransitivity, 5.4s TimeCoverageRelationStatistics Valid=2604, Invalid=14166, Unknown=0, NotChecked=0, Total=16770 [2023-11-19 04:59:29,946 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 87 mSDsluCounter, 34 mSDsCounter, 0 mSdLazyCounter, 962 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 87 SdHoareTripleChecker+Valid, 36 SdHoareTripleChecker+Invalid, 966 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 962 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2023-11-19 04:59:29,946 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [87 Valid, 36 Invalid, 966 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 962 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2023-11-19 04:59:29,947 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 140 states. [2023-11-19 04:59:30,005 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 140 to 131. [2023-11-19 04:59:30,006 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 131 states, 130 states have (on average 1.1153846153846154) internal successors, (145), 130 states have internal predecessors, (145), 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) [2023-11-19 04:59:30,008 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 131 states to 131 states and 145 transitions. [2023-11-19 04:59:30,008 INFO L78 Accepts]: Start accepts. Automaton has 131 states and 145 transitions. Word has length 52 [2023-11-19 04:59:30,008 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 04:59:30,008 INFO L495 AbstractCegarLoop]: Abstraction has 131 states and 145 transitions. [2023-11-19 04:59:30,009 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 1.8571428571428572) internal successors, (65), 35 states have internal predecessors, (65), 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) [2023-11-19 04:59:30,009 INFO L276 IsEmpty]: Start isEmpty. Operand 131 states and 145 transitions. [2023-11-19 04:59:30,013 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 131 [2023-11-19 04:59:30,013 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 04:59:30,013 INFO L195 NwaCegarLoop]: trace histogram [98, 14, 14, 1, 1, 1, 1] [2023-11-19 04:59:30,043 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_10921cf2-56d6-4af9-af4d-bfeb25855ed7/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-11-19 04:59:30,233 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_10921cf2-56d6-4af9-af4d-bfeb25855ed7/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 04:59:30,233 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 04:59:30,234 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 04:59:30,234 INFO L85 PathProgramCache]: Analyzing trace with hash -673848951, now seen corresponding path program 5 times [2023-11-19 04:59:30,234 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 04:59:30,234 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [882322833] [2023-11-19 04:59:30,234 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 04:59:30,235 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 04:59:30,338 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 04:59:30,883 INFO L134 CoverageAnalysis]: Checked inductivity of 6321 backedges. 846 proven. 28 refuted. 0 times theorem prover too weak. 5447 trivial. 0 not checked. [2023-11-19 04:59:30,884 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 04:59:30,884 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [882322833] [2023-11-19 04:59:30,884 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [882322833] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 04:59:30,884 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1930837632] [2023-11-19 04:59:30,884 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-19 04:59:30,885 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 04:59:30,885 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_10921cf2-56d6-4af9-af4d-bfeb25855ed7/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 04:59:30,886 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_10921cf2-56d6-4af9-af4d-bfeb25855ed7/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 04:59:30,913 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_10921cf2-56d6-4af9-af4d-bfeb25855ed7/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-11-19 04:59:30,980 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2023-11-19 04:59:30,980 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-19 04:59:30,981 INFO L262 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 17 conjunts are in the unsatisfiable core [2023-11-19 04:59:30,986 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 04:59:31,017 INFO L134 CoverageAnalysis]: Checked inductivity of 6321 backedges. 846 proven. 28 refuted. 0 times theorem prover too weak. 5447 trivial. 0 not checked. [2023-11-19 04:59:31,017 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 04:59:31,162 INFO L134 CoverageAnalysis]: Checked inductivity of 6321 backedges. 846 proven. 28 refuted. 0 times theorem prover too weak. 5447 trivial. 0 not checked. [2023-11-19 04:59:31,163 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1930837632] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 04:59:31,163 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1348812182] [2023-11-19 04:59:31,166 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2023-11-19 04:59:31,166 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 04:59:31,166 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 04:59:31,166 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 04:59:31,167 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 04:59:31,413 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-19 04:59:31,525 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2799#(and (<= 1 |#StackHeapBarrier|) (<= 268435455 (mod |ULTIMATE.start_main_~x~0#1| 4294967296)) (<= 0 |ULTIMATE.start_main_~y~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (mod |ULTIMATE.start_main_~x~0#1| 2) 0) (<= 1 |ULTIMATE.start_main_~x~0#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-11-19 04:59:31,525 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-19 04:59:31,526 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-19 04:59:31,526 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 19 [2023-11-19 04:59:31,526 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [151375590] [2023-11-19 04:59:31,526 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-19 04:59:31,527 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2023-11-19 04:59:31,527 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 04:59:31,527 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2023-11-19 04:59:31,528 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=104, Invalid=358, Unknown=0, NotChecked=0, Total=462 [2023-11-19 04:59:31,528 INFO L87 Difference]: Start difference. First operand 131 states and 145 transitions. Second operand has 19 states, 19 states have (on average 1.5789473684210527) internal successors, (30), 19 states have internal predecessors, (30), 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) [2023-11-19 04:59:31,665 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 04:59:31,665 INFO L93 Difference]: Finished difference Result 294 states and 363 transitions. [2023-11-19 04:59:31,666 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2023-11-19 04:59:31,666 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 1.5789473684210527) internal successors, (30), 19 states have internal predecessors, (30), 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 130 [2023-11-19 04:59:31,666 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 04:59:31,667 INFO L225 Difference]: With dead ends: 294 [2023-11-19 04:59:31,668 INFO L226 Difference]: Without dead ends: 173 [2023-11-19 04:59:31,669 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 399 GetRequests, 378 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 74 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=117, Invalid=389, Unknown=0, NotChecked=0, Total=506 [2023-11-19 04:59:31,670 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 0 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 95 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 21 SdHoareTripleChecker+Invalid, 99 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 95 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-19 04:59:31,670 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 21 Invalid, 99 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 95 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-19 04:59:31,671 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 173 states. [2023-11-19 04:59:31,741 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 173 to 173. [2023-11-19 04:59:31,742 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 173 states, 172 states have (on average 1.0872093023255813) internal successors, (187), 172 states have internal predecessors, (187), 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) [2023-11-19 04:59:31,744 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 173 states to 173 states and 187 transitions. [2023-11-19 04:59:31,744 INFO L78 Accepts]: Start accepts. Automaton has 173 states and 187 transitions. Word has length 130 [2023-11-19 04:59:31,744 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 04:59:31,744 INFO L495 AbstractCegarLoop]: Abstraction has 173 states and 187 transitions. [2023-11-19 04:59:31,745 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 1.5789473684210527) internal successors, (30), 19 states have internal predecessors, (30), 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) [2023-11-19 04:59:31,745 INFO L276 IsEmpty]: Start isEmpty. Operand 173 states and 187 transitions. [2023-11-19 04:59:31,748 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 173 [2023-11-19 04:59:31,748 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 04:59:31,748 INFO L195 NwaCegarLoop]: trace histogram [140, 14, 14, 1, 1, 1, 1] [2023-11-19 04:59:31,776 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_10921cf2-56d6-4af9-af4d-bfeb25855ed7/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-11-19 04:59:31,970 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_10921cf2-56d6-4af9-af4d-bfeb25855ed7/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 04:59:31,970 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 04:59:31,971 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 04:59:31,971 INFO L85 PathProgramCache]: Analyzing trace with hash 1082780049, now seen corresponding path program 6 times [2023-11-19 04:59:31,971 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 04:59:31,971 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [529937834] [2023-11-19 04:59:31,971 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 04:59:31,971 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 04:59:32,099 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 04:59:33,107 INFO L134 CoverageAnalysis]: Checked inductivity of 11886 backedges. 0 proven. 11116 refuted. 0 times theorem prover too weak. 770 trivial. 0 not checked. [2023-11-19 04:59:33,107 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 04:59:33,107 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [529937834] [2023-11-19 04:59:33,107 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [529937834] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 04:59:33,108 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [127746476] [2023-11-19 04:59:33,108 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-11-19 04:59:33,108 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 04:59:33,108 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_10921cf2-56d6-4af9-af4d-bfeb25855ed7/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 04:59:33,109 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_10921cf2-56d6-4af9-af4d-bfeb25855ed7/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 04:59:33,118 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_10921cf2-56d6-4af9-af4d-bfeb25855ed7/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-11-19 04:59:33,294 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-11-19 04:59:33,294 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-19 04:59:33,297 INFO L262 TraceCheckSpWp]: Trace formula consists of 537 conjuncts, 31 conjunts are in the unsatisfiable core [2023-11-19 04:59:33,306 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 04:59:33,648 INFO L134 CoverageAnalysis]: Checked inductivity of 11886 backedges. 0 proven. 11116 refuted. 0 times theorem prover too weak. 770 trivial. 0 not checked. [2023-11-19 04:59:33,648 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 04:59:34,630 INFO L134 CoverageAnalysis]: Checked inductivity of 11886 backedges. 0 proven. 11116 refuted. 0 times theorem prover too weak. 770 trivial. 0 not checked. [2023-11-19 04:59:34,630 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [127746476] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 04:59:34,630 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1063422650] [2023-11-19 04:59:34,633 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2023-11-19 04:59:34,633 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 04:59:34,633 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 04:59:34,634 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 04:59:34,634 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 04:59:34,894 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-19 04:59:35,081 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4786#(and (<= 1 |#StackHeapBarrier|) (<= 268435455 (mod |ULTIMATE.start_main_~x~0#1| 4294967296)) (<= 0 |ULTIMATE.start_main_~y~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (mod |ULTIMATE.start_main_~x~0#1| 2) 0) (<= 1 |ULTIMATE.start_main_~x~0#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-11-19 04:59:35,081 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-19 04:59:35,081 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-19 04:59:35,081 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 32 [2023-11-19 04:59:35,082 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [725176359] [2023-11-19 04:59:35,082 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-19 04:59:35,083 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2023-11-19 04:59:35,083 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 04:59:35,084 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2023-11-19 04:59:35,085 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=327, Invalid=933, Unknown=0, NotChecked=0, Total=1260 [2023-11-19 04:59:35,085 INFO L87 Difference]: Start difference. First operand 173 states and 187 transitions. Second operand has 33 states, 33 states have (on average 2.787878787878788) internal successors, (92), 32 states have internal predecessors, (92), 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) [2023-11-19 04:59:39,640 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 04:59:39,641 INFO L93 Difference]: Finished difference Result 380 states and 418 transitions. [2023-11-19 04:59:39,641 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2023-11-19 04:59:39,641 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 2.787878787878788) internal successors, (92), 32 states have internal predecessors, (92), 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 172 [2023-11-19 04:59:39,643 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 04:59:39,645 INFO L225 Difference]: With dead ends: 380 [2023-11-19 04:59:39,645 INFO L226 Difference]: Without dead ends: 377 [2023-11-19 04:59:39,647 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 544 GetRequests, 496 SyntacticMatches, 0 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 215 ImplicationChecksByTransitivity, 4.9s TimeCoverageRelationStatistics Valid=789, Invalid=1661, Unknown=0, NotChecked=0, Total=2450 [2023-11-19 04:59:39,648 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 34 mSDsluCounter, 257 mSDsCounter, 0 mSdLazyCounter, 499 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 34 SdHoareTripleChecker+Valid, 274 SdHoareTripleChecker+Invalid, 501 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 499 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-11-19 04:59:39,649 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [34 Valid, 274 Invalid, 501 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 499 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-11-19 04:59:39,650 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 377 states. [2023-11-19 04:59:39,775 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 377 to 365. [2023-11-19 04:59:39,776 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 365 states, 364 states have (on average 1.085164835164835) internal successors, (395), 364 states have internal predecessors, (395), 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) [2023-11-19 04:59:39,778 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 365 states to 365 states and 395 transitions. [2023-11-19 04:59:39,778 INFO L78 Accepts]: Start accepts. Automaton has 365 states and 395 transitions. Word has length 172 [2023-11-19 04:59:39,779 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 04:59:39,779 INFO L495 AbstractCegarLoop]: Abstraction has 365 states and 395 transitions. [2023-11-19 04:59:39,780 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 33 states have (on average 2.787878787878788) internal successors, (92), 32 states have internal predecessors, (92), 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) [2023-11-19 04:59:39,780 INFO L276 IsEmpty]: Start isEmpty. Operand 365 states and 395 transitions. [2023-11-19 04:59:39,788 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 365 [2023-11-19 04:59:39,788 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 04:59:39,788 INFO L195 NwaCegarLoop]: trace histogram [300, 30, 30, 1, 1, 1, 1] [2023-11-19 04:59:39,808 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_10921cf2-56d6-4af9-af4d-bfeb25855ed7/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2023-11-19 04:59:40,001 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_10921cf2-56d6-4af9-af4d-bfeb25855ed7/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 04:59:40,001 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 04:59:40,002 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 04:59:40,002 INFO L85 PathProgramCache]: Analyzing trace with hash 1857000785, now seen corresponding path program 7 times [2023-11-19 04:59:40,002 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 04:59:40,002 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1043061518] [2023-11-19 04:59:40,002 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 04:59:40,002 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 04:59:40,482 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 04:59:43,874 INFO L134 CoverageAnalysis]: Checked inductivity of 54750 backedges. 0 proven. 53100 refuted. 0 times theorem prover too weak. 1650 trivial. 0 not checked. [2023-11-19 04:59:43,875 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 04:59:43,875 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1043061518] [2023-11-19 04:59:43,875 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1043061518] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 04:59:43,875 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [216138151] [2023-11-19 04:59:43,876 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-11-19 04:59:43,876 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 04:59:43,876 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_10921cf2-56d6-4af9-af4d-bfeb25855ed7/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 04:59:43,877 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_10921cf2-56d6-4af9-af4d-bfeb25855ed7/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 04:59:43,901 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_10921cf2-56d6-4af9-af4d-bfeb25855ed7/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-11-19 04:59:44,235 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 04:59:44,242 INFO L262 TraceCheckSpWp]: Trace formula consists of 1113 conjuncts, 63 conjunts are in the unsatisfiable core [2023-11-19 04:59:44,262 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 04:59:44,784 INFO L134 CoverageAnalysis]: Checked inductivity of 54750 backedges. 0 proven. 53100 refuted. 0 times theorem prover too weak. 1650 trivial. 0 not checked. [2023-11-19 04:59:44,785 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 04:59:47,547 INFO L134 CoverageAnalysis]: Checked inductivity of 54750 backedges. 0 proven. 53100 refuted. 0 times theorem prover too weak. 1650 trivial. 0 not checked. [2023-11-19 04:59:47,548 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [216138151] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 04:59:47,548 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2082601507] [2023-11-19 04:59:47,550 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2023-11-19 04:59:47,550 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 04:59:47,550 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 04:59:47,551 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 04:59:47,551 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 04:59:47,734 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-19 04:59:48,058 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '8539#(and (<= 1 |#StackHeapBarrier|) (<= 268435455 (mod |ULTIMATE.start_main_~x~0#1| 4294967296)) (<= 0 |ULTIMATE.start_main_~y~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (mod |ULTIMATE.start_main_~x~0#1| 2) 0) (<= 1 |ULTIMATE.start_main_~x~0#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-11-19 04:59:48,058 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-19 04:59:48,058 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-19 04:59:48,059 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 32] total 64 [2023-11-19 04:59:48,059 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [519306938] [2023-11-19 04:59:48,059 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-19 04:59:48,060 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 65 states [2023-11-19 04:59:48,060 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 04:59:48,062 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 65 interpolants. [2023-11-19 04:59:48,064 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1159, Invalid=3397, Unknown=0, NotChecked=0, Total=4556 [2023-11-19 04:59:48,064 INFO L87 Difference]: Start difference. First operand 365 states and 395 transitions. Second operand has 65 states, 65 states have (on average 2.8923076923076922) internal successors, (188), 64 states have internal predecessors, (188), 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)