./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/array-examples/standard_strcmp_ground.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version cf1a7837 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_31dc3e1c-8ba3-427e-939b-6399229f744c/bin/utaipan-verify-NcY6lQBIFX/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_31dc3e1c-8ba3-427e-939b-6399229f744c/bin/utaipan-verify-NcY6lQBIFX/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_31dc3e1c-8ba3-427e-939b-6399229f744c/bin/utaipan-verify-NcY6lQBIFX/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_31dc3e1c-8ba3-427e-939b-6399229f744c/bin/utaipan-verify-NcY6lQBIFX/config/TaipanReach.xml -i ../../sv-benchmarks/c/array-examples/standard_strcmp_ground.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_31dc3e1c-8ba3-427e-939b-6399229f744c/bin/utaipan-verify-NcY6lQBIFX/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_31dc3e1c-8ba3-427e-939b-6399229f744c/bin/utaipan-verify-NcY6lQBIFX --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 c802cbda9e8bed6a313e86b45d5d1f15426dd1417288149156d2bae000d97c78 --- Real Ultimate output --- This is Ultimate 0.2.3-dev-cf1a783 [2023-11-12 00:45:14,388 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-12 00:45:14,455 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_31dc3e1c-8ba3-427e-939b-6399229f744c/bin/utaipan-verify-NcY6lQBIFX/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-11-12 00:45:14,459 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-12 00:45:14,460 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-12 00:45:14,486 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-12 00:45:14,487 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-12 00:45:14,487 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-12 00:45:14,488 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-12 00:45:14,489 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-12 00:45:14,489 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-12 00:45:14,490 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-12 00:45:14,491 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-12 00:45:14,491 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-12 00:45:14,492 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-12 00:45:14,492 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-12 00:45:14,493 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-12 00:45:14,493 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-12 00:45:14,510 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-12 00:45:14,511 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-12 00:45:14,511 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-12 00:45:14,512 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-12 00:45:14,513 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-12 00:45:14,513 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-11-12 00:45:14,514 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-12 00:45:14,514 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-12 00:45:14,514 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-12 00:45:14,515 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-12 00:45:14,515 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-11-12 00:45:14,516 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-12 00:45:14,516 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-11-12 00:45:14,517 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-12 00:45:14,517 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-11-12 00:45:14,518 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-12 00:45:14,518 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-12 00:45:14,519 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-12 00:45:14,519 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-12 00:45:14,520 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-12 00:45:14,520 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-12 00:45:14,520 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-11-12 00:45:14,521 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-12 00:45:14,522 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-12 00:45:14,522 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-11-12 00:45:14,522 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-12 00:45:14,523 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-12 00:45:14,523 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_31dc3e1c-8ba3-427e-939b-6399229f744c/bin/utaipan-verify-NcY6lQBIFX/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_31dc3e1c-8ba3-427e-939b-6399229f744c/bin/utaipan-verify-NcY6lQBIFX Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> c802cbda9e8bed6a313e86b45d5d1f15426dd1417288149156d2bae000d97c78 [2023-11-12 00:45:14,775 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-12 00:45:14,806 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-12 00:45:14,809 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-12 00:45:14,811 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-12 00:45:14,811 INFO L274 PluginConnector]: CDTParser initialized [2023-11-12 00:45:14,813 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_31dc3e1c-8ba3-427e-939b-6399229f744c/bin/utaipan-verify-NcY6lQBIFX/../../sv-benchmarks/c/array-examples/standard_strcmp_ground.i [2023-11-12 00:45:17,924 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-12 00:45:18,130 INFO L384 CDTParser]: Found 1 translation units. [2023-11-12 00:45:18,131 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_31dc3e1c-8ba3-427e-939b-6399229f744c/sv-benchmarks/c/array-examples/standard_strcmp_ground.i [2023-11-12 00:45:18,137 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_31dc3e1c-8ba3-427e-939b-6399229f744c/bin/utaipan-verify-NcY6lQBIFX/data/9b7461853/2cd9d8693fdf4690913ec1733aa35e61/FLAGe183ea239 [2023-11-12 00:45:18,163 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_31dc3e1c-8ba3-427e-939b-6399229f744c/bin/utaipan-verify-NcY6lQBIFX/data/9b7461853/2cd9d8693fdf4690913ec1733aa35e61 [2023-11-12 00:45:18,169 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-12 00:45:18,170 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-12 00:45:18,171 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-12 00:45:18,172 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-12 00:45:18,177 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-12 00:45:18,178 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 12.11 12:45:18" (1/1) ... [2023-11-12 00:45:18,179 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@72f1be74 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:45:18, skipping insertion in model container [2023-11-12 00:45:18,179 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 12.11 12:45:18" (1/1) ... [2023-11-12 00:45:18,200 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-12 00:45:18,339 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_31dc3e1c-8ba3-427e-939b-6399229f744c/sv-benchmarks/c/array-examples/standard_strcmp_ground.i[815,828] [2023-11-12 00:45:18,358 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-12 00:45:18,367 INFO L202 MainTranslator]: Completed pre-run [2023-11-12 00:45:18,378 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_31dc3e1c-8ba3-427e-939b-6399229f744c/sv-benchmarks/c/array-examples/standard_strcmp_ground.i[815,828] [2023-11-12 00:45:18,387 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-12 00:45:18,402 INFO L206 MainTranslator]: Completed translation [2023-11-12 00:45:18,402 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:45:18 WrapperNode [2023-11-12 00:45:18,402 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-12 00:45:18,404 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-12 00:45:18,404 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-12 00:45:18,404 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-12 00:45:18,411 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:45:18" (1/1) ... [2023-11-12 00:45:18,418 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:45:18" (1/1) ... [2023-11-12 00:45:18,435 INFO L138 Inliner]: procedures = 17, calls = 20, calls flagged for inlining = 4, calls inlined = 4, statements flattened = 81 [2023-11-12 00:45:18,436 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-12 00:45:18,437 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-12 00:45:18,437 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-12 00:45:18,437 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-12 00:45:18,443 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:45:18" (1/1) ... [2023-11-12 00:45:18,443 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:45:18" (1/1) ... [2023-11-12 00:45:18,446 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:45:18" (1/1) ... [2023-11-12 00:45:18,446 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:45:18" (1/1) ... [2023-11-12 00:45:18,452 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:45:18" (1/1) ... [2023-11-12 00:45:18,456 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:45:18" (1/1) ... [2023-11-12 00:45:18,457 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:45:18" (1/1) ... [2023-11-12 00:45:18,458 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:45:18" (1/1) ... [2023-11-12 00:45:18,460 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-12 00:45:18,461 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-12 00:45:18,462 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-12 00:45:18,462 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-12 00:45:18,463 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:45:18" (1/1) ... [2023-11-12 00:45:18,469 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-12 00:45:18,485 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_31dc3e1c-8ba3-427e-939b-6399229f744c/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:45:18,498 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_31dc3e1c-8ba3-427e-939b-6399229f744c/bin/utaipan-verify-NcY6lQBIFX/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-12 00:45:18,538 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_31dc3e1c-8ba3-427e-939b-6399229f744c/bin/utaipan-verify-NcY6lQBIFX/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-12 00:45:18,550 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-12 00:45:18,550 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-12 00:45:18,550 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-11-12 00:45:18,550 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-11-12 00:45:18,550 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-12 00:45:18,550 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-12 00:45:18,551 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-11-12 00:45:18,551 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-11-12 00:45:18,624 INFO L236 CfgBuilder]: Building ICFG [2023-11-12 00:45:18,626 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-12 00:45:18,797 INFO L277 CfgBuilder]: Performing block encoding [2023-11-12 00:45:18,840 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-12 00:45:18,841 INFO L302 CfgBuilder]: Removed 3 assume(true) statements. [2023-11-12 00:45:18,843 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 12.11 12:45:18 BoogieIcfgContainer [2023-11-12 00:45:18,844 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-12 00:45:18,847 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-12 00:45:18,847 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-12 00:45:18,850 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-12 00:45:18,862 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 12.11 12:45:18" (1/3) ... [2023-11-12 00:45:18,863 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2878289a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 12.11 12:45:18, skipping insertion in model container [2023-11-12 00:45:18,863 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:45:18" (2/3) ... [2023-11-12 00:45:18,864 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2878289a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 12.11 12:45:18, skipping insertion in model container [2023-11-12 00:45:18,864 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 12.11 12:45:18" (3/3) ... [2023-11-12 00:45:18,865 INFO L112 eAbstractionObserver]: Analyzing ICFG standard_strcmp_ground.i [2023-11-12 00:45:18,880 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-12 00:45:18,881 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-11-12 00:45:18,923 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-12 00:45:18,928 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;@c6ddff1, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-12 00:45:18,929 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-11-12 00:45:18,932 INFO L276 IsEmpty]: Start isEmpty. Operand has 13 states, 11 states have (on average 1.6363636363636365) internal successors, (18), 12 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:45:18,937 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2023-11-12 00:45:18,937 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:45:18,938 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:45:18,938 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 00:45:18,943 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:45:18,943 INFO L85 PathProgramCache]: Analyzing trace with hash 1943705511, now seen corresponding path program 1 times [2023-11-12 00:45:18,951 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:45:18,951 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1257009309] [2023-11-12 00:45:18,951 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:45:18,952 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:45:19,152 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:45:19,339 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 00:45:19,339 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:45:19,340 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1257009309] [2023-11-12 00:45:19,340 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1257009309] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 00:45:19,341 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-12 00:45:19,341 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-12 00:45:19,343 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1709266306] [2023-11-12 00:45:19,344 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 00:45:19,350 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-12 00:45:19,351 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:45:19,390 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-12 00:45:19,392 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-12 00:45:19,394 INFO L87 Difference]: Start difference. First operand has 13 states, 11 states have (on average 1.6363636363636365) internal successors, (18), 12 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 2 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) [2023-11-12 00:45:19,473 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:45:19,473 INFO L93 Difference]: Finished difference Result 25 states and 35 transitions. [2023-11-12 00:45:19,475 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-12 00:45:19,476 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 2 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2023-11-12 00:45:19,477 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:45:19,485 INFO L225 Difference]: With dead ends: 25 [2023-11-12 00:45:19,486 INFO L226 Difference]: Without dead ends: 12 [2023-11-12 00:45:19,489 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 [2023-11-12 00:45:19,494 INFO L413 NwaCegarLoop]: 10 mSDtfsCounter, 0 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 13 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 20 SdHoareTripleChecker+Invalid, 13 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 13 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-12 00:45:19,496 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 20 Invalid, 13 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 13 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-12 00:45:19,515 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2023-11-12 00:45:19,527 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2023-11-12 00:45:19,528 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 12 states, 11 states have (on average 1.3636363636363635) internal successors, (15), 11 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:45:19,529 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 15 transitions. [2023-11-12 00:45:19,530 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 15 transitions. Word has length 8 [2023-11-12 00:45:19,531 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:45:19,532 INFO L495 AbstractCegarLoop]: Abstraction has 12 states and 15 transitions. [2023-11-12 00:45:19,532 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 2 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) [2023-11-12 00:45:19,532 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 15 transitions. [2023-11-12 00:45:19,533 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2023-11-12 00:45:19,534 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:45:19,534 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:45:19,534 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-12 00:45:19,535 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 00:45:19,536 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:45:19,536 INFO L85 PathProgramCache]: Analyzing trace with hash 1204192048, now seen corresponding path program 1 times [2023-11-12 00:45:19,536 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:45:19,537 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [515106918] [2023-11-12 00:45:19,537 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:45:19,537 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:45:19,595 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:45:19,671 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 00:45:19,672 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:45:19,672 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [515106918] [2023-11-12 00:45:19,672 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [515106918] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:45:19,673 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1273236552] [2023-11-12 00:45:19,673 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:45:19,673 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:45:19,674 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_31dc3e1c-8ba3-427e-939b-6399229f744c/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:45:19,677 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_31dc3e1c-8ba3-427e-939b-6399229f744c/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:45:19,692 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_31dc3e1c-8ba3-427e-939b-6399229f744c/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-12 00:45:19,776 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:45:19,778 INFO L262 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 2 conjunts are in the unsatisfiable core [2023-11-12 00:45:19,783 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:45:19,801 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-12 00:45:19,802 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-12 00:45:19,802 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1273236552] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 00:45:19,803 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-12 00:45:19,803 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [3] total 5 [2023-11-12 00:45:19,804 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [312947091] [2023-11-12 00:45:19,804 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 00:45:19,805 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-12 00:45:19,805 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:45:19,806 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-12 00:45:19,806 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2023-11-12 00:45:19,807 INFO L87 Difference]: Start difference. First operand 12 states and 15 transitions. Second operand has 3 states, 3 states have (on average 3.0) internal successors, (9), 3 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:45:19,830 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:45:19,830 INFO L93 Difference]: Finished difference Result 22 states and 27 transitions. [2023-11-12 00:45:19,830 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-12 00:45:19,831 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 3.0) internal successors, (9), 3 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2023-11-12 00:45:19,831 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:45:19,832 INFO L225 Difference]: With dead ends: 22 [2023-11-12 00:45:19,832 INFO L226 Difference]: Without dead ends: 15 [2023-11-12 00:45:19,833 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2023-11-12 00:45:19,834 INFO L413 NwaCegarLoop]: 7 mSDtfsCounter, 2 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 14 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 14 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 14 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-12 00:45:19,835 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 13 Invalid, 14 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 14 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-12 00:45:19,836 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2023-11-12 00:45:19,839 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 13. [2023-11-12 00:45:19,839 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13 states, 12 states have (on average 1.3333333333333333) internal successors, (16), 12 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:45:19,840 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 16 transitions. [2023-11-12 00:45:19,840 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 16 transitions. Word has length 9 [2023-11-12 00:45:19,841 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:45:19,841 INFO L495 AbstractCegarLoop]: Abstraction has 13 states and 16 transitions. [2023-11-12 00:45:19,841 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 3.0) internal successors, (9), 3 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:45:19,841 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 16 transitions. [2023-11-12 00:45:19,842 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2023-11-12 00:45:19,842 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:45:19,843 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:45:19,853 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_31dc3e1c-8ba3-427e-939b-6399229f744c/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-11-12 00:45:20,048 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_31dc3e1c-8ba3-427e-939b-6399229f744c/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:45:20,048 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 00:45:20,049 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:45:20,049 INFO L85 PathProgramCache]: Analyzing trace with hash -462348324, now seen corresponding path program 1 times [2023-11-12 00:45:20,050 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:45:20,050 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [863406016] [2023-11-12 00:45:20,050 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:45:20,050 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:45:20,070 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:45:20,130 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 00:45:20,130 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:45:20,130 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [863406016] [2023-11-12 00:45:20,131 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [863406016] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:45:20,131 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1658833382] [2023-11-12 00:45:20,131 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:45:20,131 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:45:20,132 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_31dc3e1c-8ba3-427e-939b-6399229f744c/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:45:20,133 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_31dc3e1c-8ba3-427e-939b-6399229f744c/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:45:20,137 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_31dc3e1c-8ba3-427e-939b-6399229f744c/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-12 00:45:20,247 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:45:20,250 INFO L262 TraceCheckSpWp]: Trace formula consists of 102 conjuncts, 3 conjunts are in the unsatisfiable core [2023-11-12 00:45:20,253 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:45:20,292 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 00:45:20,293 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 00:45:20,326 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 00:45:20,327 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1658833382] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-12 00:45:20,327 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1789286883] [2023-11-12 00:45:20,355 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2023-11-12 00:45:20,356 INFO L166 IcfgInterpreter]: Building call graph [2023-11-12 00:45:20,359 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-12 00:45:20,365 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-12 00:45:20,365 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-12 00:45:20,899 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-12 00:45:21,143 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSifa [1789286883] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 00:45:21,143 INFO L185 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2023-11-12 00:45:21,143 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [3, 3, 3] total 11 [2023-11-12 00:45:21,144 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [947868147] [2023-11-12 00:45:21,144 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 00:45:21,145 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-11-12 00:45:21,145 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:45:21,146 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-11-12 00:45:21,146 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=99, Unknown=0, NotChecked=0, Total=132 [2023-11-12 00:45:21,147 INFO L87 Difference]: Start difference. First operand 13 states and 16 transitions. Second operand has 7 states, 7 states have (on average 1.4285714285714286) internal successors, (10), 6 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:45:21,208 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:45:21,209 INFO L93 Difference]: Finished difference Result 21 states and 25 transitions. [2023-11-12 00:45:21,209 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-11-12 00:45:21,209 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 1.4285714285714286) internal successors, (10), 6 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 10 [2023-11-12 00:45:21,210 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:45:21,210 INFO L225 Difference]: With dead ends: 21 [2023-11-12 00:45:21,210 INFO L226 Difference]: Without dead ends: 14 [2023-11-12 00:45:21,211 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=33, Invalid=99, Unknown=0, NotChecked=0, Total=132 [2023-11-12 00:45:21,213 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 0 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 48 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 21 SdHoareTripleChecker+Invalid, 48 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 48 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-12 00:45:21,213 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 21 Invalid, 48 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 48 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-12 00:45:21,214 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2023-11-12 00:45:21,217 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2023-11-12 00:45:21,218 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14 states, 13 states have (on average 1.3076923076923077) internal successors, (17), 13 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:45:21,218 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 17 transitions. [2023-11-12 00:45:21,219 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 17 transitions. Word has length 10 [2023-11-12 00:45:21,219 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:45:21,219 INFO L495 AbstractCegarLoop]: Abstraction has 14 states and 17 transitions. [2023-11-12 00:45:21,219 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 1.4285714285714286) internal successors, (10), 6 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:45:21,220 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 17 transitions. [2023-11-12 00:45:21,220 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2023-11-12 00:45:21,220 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:45:21,221 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:45:21,231 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_31dc3e1c-8ba3-427e-939b-6399229f744c/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-11-12 00:45:21,426 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_31dc3e1c-8ba3-427e-939b-6399229f744c/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:45:21,426 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 00:45:21,426 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:45:21,427 INFO L85 PathProgramCache]: Analyzing trace with hash 1497894613, now seen corresponding path program 1 times [2023-11-12 00:45:21,427 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:45:21,427 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [66597428] [2023-11-12 00:45:21,427 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:45:21,428 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:45:21,447 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:45:21,509 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-12 00:45:21,510 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:45:21,514 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [66597428] [2023-11-12 00:45:21,514 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [66597428] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:45:21,514 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1446528096] [2023-11-12 00:45:21,515 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:45:21,515 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:45:21,515 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_31dc3e1c-8ba3-427e-939b-6399229f744c/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:45:21,516 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_31dc3e1c-8ba3-427e-939b-6399229f744c/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:45:21,540 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_31dc3e1c-8ba3-427e-939b-6399229f744c/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-12 00:45:21,608 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:45:21,609 INFO L262 TraceCheckSpWp]: Trace formula consists of 106 conjuncts, 3 conjunts are in the unsatisfiable core [2023-11-12 00:45:21,610 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:45:21,628 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-12 00:45:21,628 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 00:45:21,661 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-12 00:45:21,661 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1446528096] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-12 00:45:21,662 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2081523001] [2023-11-12 00:45:21,664 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2023-11-12 00:45:21,665 INFO L166 IcfgInterpreter]: Building call graph [2023-11-12 00:45:21,666 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-12 00:45:21,667 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-12 00:45:21,667 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-12 00:45:22,144 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-12 00:45:22,566 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '320#(and (= |ULTIMATE.start_main_~c~0#1| 0) (= |ULTIMATE.start__strcmp_#res#1| 0) (<= 1 |#StackHeapBarrier|) (not (= |ULTIMATE.start_main_#t~mem9#1| |ULTIMATE.start_main_#t~mem8#1|)) (= |ULTIMATE.start_main_~#b~0#1.offset| 0) (<= 2 |ULTIMATE.start_main_~#b~0#1.base|) (= (select (select |#memory_int| |ULTIMATE.start_main_~#b~0#1.base|) 0) |ULTIMATE.start_main_#t~mem9#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 2 |ULTIMATE.start_main_~#a~0#1.base|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0) (= |ULTIMATE.start_main_~x~0#1| 0) (= |ULTIMATE.start_main_#t~mem8#1| (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) 0)))' at error location [2023-11-12 00:45:22,566 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-12 00:45:22,573 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-12 00:45:22,573 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 6 [2023-11-12 00:45:22,573 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [458913887] [2023-11-12 00:45:22,573 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-12 00:45:22,574 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-11-12 00:45:22,574 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:45:22,575 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-11-12 00:45:22,575 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=164, Unknown=0, NotChecked=0, Total=210 [2023-11-12 00:45:22,576 INFO L87 Difference]: Start difference. First operand 14 states and 17 transitions. Second operand has 7 states, 7 states have (on average 2.2857142857142856) internal successors, (16), 6 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:45:22,603 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:45:22,603 INFO L93 Difference]: Finished difference Result 28 states and 36 transitions. [2023-11-12 00:45:22,604 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-12 00:45:22,604 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.2857142857142856) internal successors, (16), 6 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2023-11-12 00:45:22,604 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:45:22,605 INFO L225 Difference]: With dead ends: 28 [2023-11-12 00:45:22,605 INFO L226 Difference]: Without dead ends: 17 [2023-11-12 00:45:22,606 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 60 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=46, Invalid=164, Unknown=0, NotChecked=0, Total=210 [2023-11-12 00:45:22,607 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 0 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 18 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 36 SdHoareTripleChecker+Invalid, 19 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 18 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-12 00:45:22,607 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 36 Invalid, 19 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 18 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-12 00:45:22,608 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2023-11-12 00:45:22,612 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2023-11-12 00:45:22,613 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 16 states have (on average 1.25) internal successors, (20), 16 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:45:22,614 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 20 transitions. [2023-11-12 00:45:22,614 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 20 transitions. Word has length 11 [2023-11-12 00:45:22,614 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:45:22,614 INFO L495 AbstractCegarLoop]: Abstraction has 17 states and 20 transitions. [2023-11-12 00:45:22,615 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 2.2857142857142856) internal successors, (16), 6 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:45:22,615 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 20 transitions. [2023-11-12 00:45:22,615 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2023-11-12 00:45:22,616 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:45:22,616 INFO L195 NwaCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:45:22,634 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_31dc3e1c-8ba3-427e-939b-6399229f744c/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-11-12 00:45:22,821 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_31dc3e1c-8ba3-427e-939b-6399229f744c/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:45:22,822 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 00:45:22,822 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:45:22,822 INFO L85 PathProgramCache]: Analyzing trace with hash -1783731252, now seen corresponding path program 2 times [2023-11-12 00:45:22,823 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:45:22,823 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [690927158] [2023-11-12 00:45:22,823 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:45:22,823 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:45:22,873 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:45:22,966 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-11-12 00:45:22,967 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:45:22,967 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [690927158] [2023-11-12 00:45:22,967 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [690927158] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:45:22,967 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [461799702] [2023-11-12 00:45:22,967 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-12 00:45:22,968 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:45:22,968 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_31dc3e1c-8ba3-427e-939b-6399229f744c/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:45:22,970 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_31dc3e1c-8ba3-427e-939b-6399229f744c/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:45:22,974 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_31dc3e1c-8ba3-427e-939b-6399229f744c/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-11-12 00:45:23,058 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2023-11-12 00:45:23,059 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-12 00:45:23,060 INFO L262 TraceCheckSpWp]: Trace formula consists of 120 conjuncts, 3 conjunts are in the unsatisfiable core [2023-11-12 00:45:23,061 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:45:23,076 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-11-12 00:45:23,076 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 00:45:23,093 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-11-12 00:45:23,093 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [461799702] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-12 00:45:23,094 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [399156368] [2023-11-12 00:45:23,096 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2023-11-12 00:45:23,097 INFO L166 IcfgInterpreter]: Building call graph [2023-11-12 00:45:23,097 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-12 00:45:23,098 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-12 00:45:23,098 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-12 00:45:23,443 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-12 00:45:23,850 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '477#(and (= |ULTIMATE.start_main_~c~0#1| 0) (= |ULTIMATE.start__strcmp_#res#1| 0) (<= 1 |#StackHeapBarrier|) (not (= |ULTIMATE.start_main_#t~mem9#1| |ULTIMATE.start_main_#t~mem8#1|)) (= |ULTIMATE.start_main_~#b~0#1.offset| 0) (<= 2 |ULTIMATE.start_main_~#b~0#1.base|) (= (select (select |#memory_int| |ULTIMATE.start_main_~#b~0#1.base|) 0) |ULTIMATE.start_main_#t~mem9#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 2 |ULTIMATE.start_main_~#a~0#1.base|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0) (= |ULTIMATE.start_main_~x~0#1| 0) (= |ULTIMATE.start_main_#t~mem8#1| (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) 0)))' at error location [2023-11-12 00:45:23,850 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-12 00:45:23,850 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-12 00:45:23,850 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 7 [2023-11-12 00:45:23,851 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [52659124] [2023-11-12 00:45:23,851 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-12 00:45:23,851 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-11-12 00:45:23,851 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:45:23,852 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-11-12 00:45:23,852 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=164, Unknown=0, NotChecked=0, Total=210 [2023-11-12 00:45:23,852 INFO L87 Difference]: Start difference. First operand 17 states and 20 transitions. Second operand has 7 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 7 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:45:23,898 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:45:23,898 INFO L93 Difference]: Finished difference Result 32 states and 40 transitions. [2023-11-12 00:45:23,899 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-12 00:45:23,899 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 7 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 14 [2023-11-12 00:45:23,899 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:45:23,900 INFO L225 Difference]: With dead ends: 32 [2023-11-12 00:45:23,901 INFO L226 Difference]: Without dead ends: 25 [2023-11-12 00:45:23,901 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 31 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 60 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=46, Invalid=164, Unknown=0, NotChecked=0, Total=210 [2023-11-12 00:45:23,902 INFO L413 NwaCegarLoop]: 7 mSDtfsCounter, 5 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 29 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 25 SdHoareTripleChecker+Invalid, 31 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 29 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-12 00:45:23,902 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [5 Valid, 25 Invalid, 31 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 29 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-12 00:45:23,903 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2023-11-12 00:45:23,907 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 22. [2023-11-12 00:45:23,908 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 21 states have (on average 1.2857142857142858) internal successors, (27), 21 states have internal predecessors, (27), 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) [2023-11-12 00:45:23,908 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 27 transitions. [2023-11-12 00:45:23,909 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 27 transitions. Word has length 14 [2023-11-12 00:45:23,909 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:45:23,909 INFO L495 AbstractCegarLoop]: Abstraction has 22 states and 27 transitions. [2023-11-12 00:45:23,909 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 7 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:45:23,910 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 27 transitions. [2023-11-12 00:45:23,910 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2023-11-12 00:45:23,910 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:45:23,910 INFO L195 NwaCegarLoop]: trace histogram [4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:45:23,925 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_31dc3e1c-8ba3-427e-939b-6399229f744c/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-11-12 00:45:24,116 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_31dc3e1c-8ba3-427e-939b-6399229f744c/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:45:24,116 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 00:45:24,117 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:45:24,117 INFO L85 PathProgramCache]: Analyzing trace with hash 1401309888, now seen corresponding path program 1 times [2023-11-12 00:45:24,117 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:45:24,117 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1315586790] [2023-11-12 00:45:24,117 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:45:24,117 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:45:24,135 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:45:24,185 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-11-12 00:45:24,185 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:45:24,185 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1315586790] [2023-11-12 00:45:24,186 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1315586790] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 00:45:24,186 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-12 00:45:24,186 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-11-12 00:45:24,186 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1815008266] [2023-11-12 00:45:24,186 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 00:45:24,187 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-12 00:45:24,187 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:45:24,187 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-12 00:45:24,188 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-12 00:45:24,188 INFO L87 Difference]: Start difference. First operand 22 states and 27 transitions. Second operand has 4 states, 4 states have (on average 2.75) internal successors, (11), 4 states have internal predecessors, (11), 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) [2023-11-12 00:45:24,226 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:45:24,226 INFO L93 Difference]: Finished difference Result 29 states and 34 transitions. [2023-11-12 00:45:24,226 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-12 00:45:24,227 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.75) internal successors, (11), 4 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 15 [2023-11-12 00:45:24,227 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:45:24,227 INFO L225 Difference]: With dead ends: 29 [2023-11-12 00:45:24,228 INFO L226 Difference]: Without dead ends: 22 [2023-11-12 00:45:24,228 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2023-11-12 00:45:24,229 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 1 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 19 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 22 SdHoareTripleChecker+Invalid, 19 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 19 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-12 00:45:24,229 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 22 Invalid, 19 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 19 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-12 00:45:24,230 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2023-11-12 00:45:24,233 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2023-11-12 00:45:24,234 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 21 states have (on average 1.1428571428571428) internal successors, (24), 21 states have internal predecessors, (24), 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) [2023-11-12 00:45:24,234 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 24 transitions. [2023-11-12 00:45:24,235 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 24 transitions. Word has length 15 [2023-11-12 00:45:24,235 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:45:24,235 INFO L495 AbstractCegarLoop]: Abstraction has 22 states and 24 transitions. [2023-11-12 00:45:24,235 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.75) internal successors, (11), 4 states have internal predecessors, (11), 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) [2023-11-12 00:45:24,235 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 24 transitions. [2023-11-12 00:45:24,236 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2023-11-12 00:45:24,236 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:45:24,236 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:45:24,236 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2023-11-12 00:45:24,237 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 00:45:24,237 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:45:24,237 INFO L85 PathProgramCache]: Analyzing trace with hash 269777403, now seen corresponding path program 3 times [2023-11-12 00:45:24,237 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:45:24,238 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1923302315] [2023-11-12 00:45:24,238 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:45:24,238 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:45:24,257 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:45:24,343 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2023-11-12 00:45:24,344 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:45:24,344 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1923302315] [2023-11-12 00:45:24,344 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1923302315] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:45:24,344 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [427740251] [2023-11-12 00:45:24,344 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-11-12 00:45:24,345 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:45:24,345 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_31dc3e1c-8ba3-427e-939b-6399229f744c/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:45:24,346 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_31dc3e1c-8ba3-427e-939b-6399229f744c/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:45:24,368 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_31dc3e1c-8ba3-427e-939b-6399229f744c/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-11-12 00:45:24,441 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-11-12 00:45:24,441 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-12 00:45:24,442 INFO L262 TraceCheckSpWp]: Trace formula consists of 175 conjuncts, 6 conjunts are in the unsatisfiable core [2023-11-12 00:45:24,444 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:45:24,495 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-11-12 00:45:24,495 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 00:45:24,584 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-11-12 00:45:24,585 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [427740251] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-12 00:45:24,585 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1514244111] [2023-11-12 00:45:24,588 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2023-11-12 00:45:24,589 INFO L166 IcfgInterpreter]: Building call graph [2023-11-12 00:45:24,589 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-12 00:45:24,590 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-12 00:45:24,590 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-12 00:45:24,931 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-12 00:45:25,399 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '773#(and (= |ULTIMATE.start_main_~c~0#1| 0) (= |ULTIMATE.start__strcmp_#res#1| 0) (<= 1 |#StackHeapBarrier|) (not (= |ULTIMATE.start_main_#t~mem9#1| |ULTIMATE.start_main_#t~mem8#1|)) (= |ULTIMATE.start_main_~#b~0#1.offset| 0) (<= 2 |ULTIMATE.start_main_~#b~0#1.base|) (= (select (select |#memory_int| |ULTIMATE.start_main_~#b~0#1.base|) 0) |ULTIMATE.start_main_#t~mem9#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 2 |ULTIMATE.start_main_~#a~0#1.base|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0) (= |ULTIMATE.start_main_~x~0#1| 0) (= |ULTIMATE.start_main_#t~mem8#1| (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) 0)))' at error location [2023-11-12 00:45:25,399 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-12 00:45:25,399 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-12 00:45:25,399 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7, 7] total 17 [2023-11-12 00:45:25,400 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [136773174] [2023-11-12 00:45:25,400 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-12 00:45:25,400 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2023-11-12 00:45:25,400 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:45:25,401 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2023-11-12 00:45:25,401 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=489, Unknown=0, NotChecked=0, Total=600 [2023-11-12 00:45:25,402 INFO L87 Difference]: Start difference. First operand 22 states and 24 transitions. Second operand has 17 states, 17 states have (on average 2.1176470588235294) internal successors, (36), 17 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) [2023-11-12 00:45:25,476 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:45:25,477 INFO L93 Difference]: Finished difference Result 51 states and 61 transitions. [2023-11-12 00:45:25,477 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2023-11-12 00:45:25,477 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.1176470588235294) internal successors, (36), 17 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 20 [2023-11-12 00:45:25,478 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:45:25,478 INFO L225 Difference]: With dead ends: 51 [2023-11-12 00:45:25,478 INFO L226 Difference]: Without dead ends: 35 [2023-11-12 00:45:25,479 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 41 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 184 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=111, Invalid=489, Unknown=0, NotChecked=0, Total=600 [2023-11-12 00:45:25,479 INFO L413 NwaCegarLoop]: 6 mSDtfsCounter, 2 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 51 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 28 SdHoareTripleChecker+Invalid, 53 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 51 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-12 00:45:25,480 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 28 Invalid, 53 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 51 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-12 00:45:25,480 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2023-11-12 00:45:25,487 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2023-11-12 00:45:25,490 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 34 states have (on average 1.088235294117647) internal successors, (37), 34 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:45:25,491 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 37 transitions. [2023-11-12 00:45:25,492 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 37 transitions. Word has length 20 [2023-11-12 00:45:25,492 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:45:25,492 INFO L495 AbstractCegarLoop]: Abstraction has 35 states and 37 transitions. [2023-11-12 00:45:25,492 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 2.1176470588235294) internal successors, (36), 17 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) [2023-11-12 00:45:25,492 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 37 transitions. [2023-11-12 00:45:25,494 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2023-11-12 00:45:25,494 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:45:25,494 INFO L195 NwaCegarLoop]: trace histogram [10, 10, 5, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:45:25,505 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_31dc3e1c-8ba3-427e-939b-6399229f744c/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2023-11-12 00:45:25,700 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_31dc3e1c-8ba3-427e-939b-6399229f744c/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:45:25,700 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 00:45:25,700 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:45:25,701 INFO L85 PathProgramCache]: Analyzing trace with hash -1866446558, now seen corresponding path program 4 times [2023-11-12 00:45:25,701 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:45:25,701 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1551379522] [2023-11-12 00:45:25,701 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:45:25,701 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:45:25,734 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:45:25,877 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2023-11-12 00:45:25,877 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:45:25,877 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1551379522] [2023-11-12 00:45:25,878 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1551379522] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:45:25,878 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [928892201] [2023-11-12 00:45:25,878 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-11-12 00:45:25,878 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:45:25,878 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_31dc3e1c-8ba3-427e-939b-6399229f744c/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:45:25,879 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_31dc3e1c-8ba3-427e-939b-6399229f744c/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:45:25,886 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_31dc3e1c-8ba3-427e-939b-6399229f744c/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-11-12 00:45:26,004 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:45:26,005 INFO L262 TraceCheckSpWp]: Trace formula consists of 243 conjuncts, 7 conjunts are in the unsatisfiable core [2023-11-12 00:45:26,008 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:45:26,026 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2023-11-12 00:45:26,026 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 00:45:26,108 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2023-11-12 00:45:26,109 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [928892201] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-12 00:45:26,109 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [712150215] [2023-11-12 00:45:26,112 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2023-11-12 00:45:26,112 INFO L166 IcfgInterpreter]: Building call graph [2023-11-12 00:45:26,113 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-12 00:45:26,113 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-12 00:45:26,113 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-12 00:45:26,429 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-12 00:45:26,854 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1116#(and (= |ULTIMATE.start_main_~c~0#1| 0) (= |ULTIMATE.start__strcmp_#res#1| 0) (<= 1 |#StackHeapBarrier|) (not (= |ULTIMATE.start_main_#t~mem9#1| |ULTIMATE.start_main_#t~mem8#1|)) (= |ULTIMATE.start_main_~#b~0#1.offset| 0) (<= 2 |ULTIMATE.start_main_~#b~0#1.base|) (= (select (select |#memory_int| |ULTIMATE.start_main_~#b~0#1.base|) 0) |ULTIMATE.start_main_#t~mem9#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 2 |ULTIMATE.start_main_~#a~0#1.base|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0) (= |ULTIMATE.start_main_~x~0#1| 0) (= |ULTIMATE.start_main_#t~mem8#1| (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) 0)))' at error location [2023-11-12 00:45:26,855 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-12 00:45:26,855 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-12 00:45:26,855 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 14 [2023-11-12 00:45:26,855 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [180703211] [2023-11-12 00:45:26,855 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-12 00:45:26,856 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2023-11-12 00:45:26,856 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:45:26,856 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2023-11-12 00:45:26,857 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=130, Invalid=376, Unknown=0, NotChecked=0, Total=506 [2023-11-12 00:45:26,857 INFO L87 Difference]: Start difference. First operand 35 states and 37 transitions. Second operand has 15 states, 15 states have (on average 1.6) internal successors, (24), 14 states have internal predecessors, (24), 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) [2023-11-12 00:45:26,892 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:45:26,893 INFO L93 Difference]: Finished difference Result 70 states and 80 transitions. [2023-11-12 00:45:26,893 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2023-11-12 00:45:26,893 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.6) internal successors, (24), 14 states have internal predecessors, (24), 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 33 [2023-11-12 00:45:26,893 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:45:26,894 INFO L225 Difference]: With dead ends: 70 [2023-11-12 00:45:26,894 INFO L226 Difference]: Without dead ends: 42 [2023-11-12 00:45:26,895 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 104 GetRequests, 83 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 172 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=130, Invalid=376, Unknown=0, NotChecked=0, Total=506 [2023-11-12 00:45:26,896 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 0 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 30 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 40 SdHoareTripleChecker+Invalid, 31 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 30 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-12 00:45:26,896 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 40 Invalid, 31 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 30 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-12 00:45:26,897 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2023-11-12 00:45:26,902 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2023-11-12 00:45:26,902 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 41 states have (on average 1.0731707317073171) internal successors, (44), 41 states have internal predecessors, (44), 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) [2023-11-12 00:45:26,903 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 44 transitions. [2023-11-12 00:45:26,903 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 44 transitions. Word has length 33 [2023-11-12 00:45:26,904 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:45:26,904 INFO L495 AbstractCegarLoop]: Abstraction has 42 states and 44 transitions. [2023-11-12 00:45:26,904 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 1.6) internal successors, (24), 14 states have internal predecessors, (24), 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) [2023-11-12 00:45:26,904 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 44 transitions. [2023-11-12 00:45:26,905 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2023-11-12 00:45:26,905 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:45:26,906 INFO L195 NwaCegarLoop]: trace histogram [12, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:45:26,912 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_31dc3e1c-8ba3-427e-939b-6399229f744c/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2023-11-12 00:45:27,111 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_31dc3e1c-8ba3-427e-939b-6399229f744c/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:45:27,112 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 00:45:27,112 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:45:27,112 INFO L85 PathProgramCache]: Analyzing trace with hash 631618841, now seen corresponding path program 5 times [2023-11-12 00:45:27,112 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:45:27,112 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1099855428] [2023-11-12 00:45:27,113 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:45:27,113 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:45:27,152 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:45:27,466 INFO L134 CoverageAnalysis]: Checked inductivity of 178 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2023-11-12 00:45:27,466 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:45:27,467 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1099855428] [2023-11-12 00:45:27,467 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1099855428] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:45:27,467 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1942873250] [2023-11-12 00:45:27,467 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-12 00:45:27,467 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:45:27,468 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_31dc3e1c-8ba3-427e-939b-6399229f744c/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:45:27,473 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_31dc3e1c-8ba3-427e-939b-6399229f744c/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:45:27,501 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_31dc3e1c-8ba3-427e-939b-6399229f744c/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-11-12 00:45:27,594 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-11-12 00:45:27,594 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-12 00:45:27,596 INFO L262 TraceCheckSpWp]: Trace formula consists of 157 conjuncts, 42 conjunts are in the unsatisfiable core [2023-11-12 00:45:27,600 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:45:27,710 INFO L322 Elim1Store]: treesize reduction 42, result has 31.1 percent of original size [2023-11-12 00:45:27,711 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 52 treesize of output 80 [2023-11-12 00:45:27,723 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 15 [2023-11-12 00:45:27,780 INFO L173 IndexEqualityManager]: detected equality via solver [2023-11-12 00:45:27,781 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 13 [2023-11-12 00:45:27,785 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2023-11-12 00:45:28,671 INFO L134 CoverageAnalysis]: Checked inductivity of 178 backedges. 12 proven. 19 refuted. 0 times theorem prover too weak. 147 trivial. 0 not checked. [2023-11-12 00:45:28,671 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 00:45:28,845 INFO L134 CoverageAnalysis]: Checked inductivity of 178 backedges. 19 proven. 0 refuted. 0 times theorem prover too weak. 159 trivial. 0 not checked. [2023-11-12 00:45:28,845 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1942873250] provided 1 perfect and 1 imperfect interpolant sequences [2023-11-12 00:45:28,845 INFO L185 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2023-11-12 00:45:28,845 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [14, 8] total 27 [2023-11-12 00:45:28,846 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [582696230] [2023-11-12 00:45:28,846 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 00:45:28,846 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-11-12 00:45:28,846 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:45:28,847 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-11-12 00:45:28,847 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=151, Invalid=549, Unknown=2, NotChecked=0, Total=702 [2023-11-12 00:45:28,848 INFO L87 Difference]: Start difference. First operand 42 states and 44 transitions. Second operand has 7 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 7 states have internal predecessors, (13), 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) [2023-11-12 00:45:28,982 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:45:28,982 INFO L93 Difference]: Finished difference Result 47 states and 49 transitions. [2023-11-12 00:45:28,982 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-11-12 00:45:28,982 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 7 states have internal predecessors, (13), 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 40 [2023-11-12 00:45:28,983 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:45:28,983 INFO L225 Difference]: With dead ends: 47 [2023-11-12 00:45:28,983 INFO L226 Difference]: Without dead ends: 45 [2023-11-12 00:45:28,984 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 96 GetRequests, 67 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 204 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=183, Invalid=745, Unknown=2, NotChecked=0, Total=930 [2023-11-12 00:45:28,985 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 13 mSDsluCounter, 9 mSDsCounter, 0 mSdLazyCounter, 38 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 14 SdHoareTripleChecker+Invalid, 39 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 38 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-12 00:45:28,985 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [13 Valid, 14 Invalid, 39 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 38 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-12 00:45:28,985 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2023-11-12 00:45:28,992 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 44. [2023-11-12 00:45:28,992 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 44 states, 43 states have (on average 1.069767441860465) internal successors, (46), 43 states have internal predecessors, (46), 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) [2023-11-12 00:45:28,993 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 46 transitions. [2023-11-12 00:45:28,993 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 46 transitions. Word has length 40 [2023-11-12 00:45:28,994 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:45:28,994 INFO L495 AbstractCegarLoop]: Abstraction has 44 states and 46 transitions. [2023-11-12 00:45:28,994 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 7 states have internal predecessors, (13), 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) [2023-11-12 00:45:28,994 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 46 transitions. [2023-11-12 00:45:28,995 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2023-11-12 00:45:28,995 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:45:28,996 INFO L195 NwaCegarLoop]: trace histogram [12, 10, 10, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:45:29,001 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_31dc3e1c-8ba3-427e-939b-6399229f744c/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2023-11-12 00:45:29,201 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_31dc3e1c-8ba3-427e-939b-6399229f744c/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:45:29,201 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 00:45:29,202 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:45:29,202 INFO L85 PathProgramCache]: Analyzing trace with hash 310398858, now seen corresponding path program 1 times [2023-11-12 00:45:29,202 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:45:29,202 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1494651195] [2023-11-12 00:45:29,202 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:45:29,202 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:45:29,251 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:45:29,620 INFO L134 CoverageAnalysis]: Checked inductivity of 180 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 102 trivial. 0 not checked. [2023-11-12 00:45:29,620 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:45:29,620 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1494651195] [2023-11-12 00:45:29,620 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1494651195] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:45:29,620 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [878463095] [2023-11-12 00:45:29,620 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:45:29,621 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:45:29,621 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_31dc3e1c-8ba3-427e-939b-6399229f744c/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:45:29,625 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_31dc3e1c-8ba3-427e-939b-6399229f744c/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:45:29,630 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_31dc3e1c-8ba3-427e-939b-6399229f744c/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-11-12 00:45:29,782 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:45:29,785 INFO L262 TraceCheckSpWp]: Trace formula consists of 353 conjuncts, 14 conjunts are in the unsatisfiable core [2023-11-12 00:45:29,791 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:45:29,826 INFO L134 CoverageAnalysis]: Checked inductivity of 180 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 102 trivial. 0 not checked. [2023-11-12 00:45:29,827 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 00:45:30,122 INFO L134 CoverageAnalysis]: Checked inductivity of 180 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 102 trivial. 0 not checked. [2023-11-12 00:45:30,123 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [878463095] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-12 00:45:30,123 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1312961566] [2023-11-12 00:45:30,125 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2023-11-12 00:45:30,125 INFO L166 IcfgInterpreter]: Building call graph [2023-11-12 00:45:30,125 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-12 00:45:30,125 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-12 00:45:30,126 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-12 00:45:30,518 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-12 00:45:31,100 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1991#(and (= |ULTIMATE.start_main_~c~0#1| 0) (= |ULTIMATE.start__strcmp_#res#1| 0) (<= 1 |#StackHeapBarrier|) (<= 0 |ULTIMATE.start_main_~x~0#1|) (not (= |ULTIMATE.start_main_#t~mem9#1| |ULTIMATE.start_main_#t~mem8#1|)) (= |ULTIMATE.start_main_~#b~0#1.offset| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (* |ULTIMATE.start_main_~x~0#1| 4)) |ULTIMATE.start_main_#t~mem8#1|) (<= |ULTIMATE.start_main_~x~0#1| 99999) (<= 2 |ULTIMATE.start_main_~#b~0#1.base|) (= |ULTIMATE.start_main_#t~mem9#1| (select (select |#memory_int| |ULTIMATE.start_main_~#b~0#1.base|) (* |ULTIMATE.start_main_~x~0#1| 4))) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 2 |ULTIMATE.start_main_~#a~0#1.base|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-11-12 00:45:31,100 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-12 00:45:31,101 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-12 00:45:31,101 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 28 [2023-11-12 00:45:31,101 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1093372386] [2023-11-12 00:45:31,101 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-12 00:45:31,102 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2023-11-12 00:45:31,102 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:45:31,103 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2023-11-12 00:45:31,104 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=436, Invalid=970, Unknown=0, NotChecked=0, Total=1406 [2023-11-12 00:45:31,104 INFO L87 Difference]: Start difference. First operand 44 states and 46 transitions. Second operand has 29 states, 29 states have (on average 1.3793103448275863) internal successors, (40), 28 states have internal predecessors, (40), 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) [2023-11-12 00:45:31,177 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:45:31,177 INFO L93 Difference]: Finished difference Result 88 states and 105 transitions. [2023-11-12 00:45:31,177 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2023-11-12 00:45:31,178 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 1.3793103448275863) internal successors, (40), 28 states have internal predecessors, (40), 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 43 [2023-11-12 00:45:31,178 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:45:31,179 INFO L225 Difference]: With dead ends: 88 [2023-11-12 00:45:31,179 INFO L226 Difference]: Without dead ends: 58 [2023-11-12 00:45:31,180 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 141 GetRequests, 105 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 412 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=436, Invalid=970, Unknown=0, NotChecked=0, Total=1406 [2023-11-12 00:45:31,181 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 0 mSDsluCounter, 24 mSDsCounter, 0 mSdLazyCounter, 40 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 32 SdHoareTripleChecker+Invalid, 41 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 40 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-12 00:45:31,181 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 32 Invalid, 41 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 40 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-12 00:45:31,182 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2023-11-12 00:45:31,190 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 58. [2023-11-12 00:45:31,191 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 58 states, 57 states have (on average 1.0526315789473684) internal successors, (60), 57 states have internal predecessors, (60), 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) [2023-11-12 00:45:31,192 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 60 transitions. [2023-11-12 00:45:31,192 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 60 transitions. Word has length 43 [2023-11-12 00:45:31,192 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:45:31,192 INFO L495 AbstractCegarLoop]: Abstraction has 58 states and 60 transitions. [2023-11-12 00:45:31,192 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 29 states have (on average 1.3793103448275863) internal successors, (40), 28 states have internal predecessors, (40), 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) [2023-11-12 00:45:31,193 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 60 transitions. [2023-11-12 00:45:31,194 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2023-11-12 00:45:31,194 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:45:31,194 INFO L195 NwaCegarLoop]: trace histogram [26, 10, 10, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:45:31,209 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_31dc3e1c-8ba3-427e-939b-6399229f744c/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2023-11-12 00:45:31,409 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_31dc3e1c-8ba3-427e-939b-6399229f744c/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2023-11-12 00:45:31,410 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 00:45:31,410 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:45:31,410 INFO L85 PathProgramCache]: Analyzing trace with hash 1428853674, now seen corresponding path program 2 times [2023-11-12 00:45:31,410 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:45:31,411 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [49011300] [2023-11-12 00:45:31,411 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:45:31,411 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:45:31,472 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:45:32,535 INFO L134 CoverageAnalysis]: Checked inductivity of 453 backedges. 0 proven. 351 refuted. 0 times theorem prover too weak. 102 trivial. 0 not checked. [2023-11-12 00:45:32,535 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:45:32,535 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [49011300] [2023-11-12 00:45:32,535 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [49011300] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:45:32,535 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1434691919] [2023-11-12 00:45:32,535 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-12 00:45:32,535 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:45:32,535 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_31dc3e1c-8ba3-427e-939b-6399229f744c/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:45:32,536 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_31dc3e1c-8ba3-427e-939b-6399229f744c/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:45:32,539 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_31dc3e1c-8ba3-427e-939b-6399229f744c/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2023-11-12 00:45:32,845 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2023-11-12 00:45:32,845 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-12 00:45:32,848 INFO L262 TraceCheckSpWp]: Trace formula consists of 243 conjuncts, 44 conjunts are in the unsatisfiable core [2023-11-12 00:45:32,856 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:45:33,414 INFO L134 CoverageAnalysis]: Checked inductivity of 453 backedges. 0 proven. 38 refuted. 0 times theorem prover too weak. 415 trivial. 0 not checked. [2023-11-12 00:45:33,414 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 00:45:33,686 INFO L322 Elim1Store]: treesize reduction 15, result has 83.5 percent of original size [2023-11-12 00:45:33,687 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 36 treesize of output 83 [2023-11-12 00:45:34,147 INFO L134 CoverageAnalysis]: Checked inductivity of 453 backedges. 8 proven. 30 refuted. 0 times theorem prover too weak. 415 trivial. 0 not checked. [2023-11-12 00:45:34,148 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1434691919] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-12 00:45:34,148 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [505113720] [2023-11-12 00:45:34,150 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2023-11-12 00:45:34,151 INFO L166 IcfgInterpreter]: Building call graph [2023-11-12 00:45:34,151 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-12 00:45:34,151 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-12 00:45:34,152 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-12 00:45:34,533 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-12 00:45:35,416 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2619#(and (= |ULTIMATE.start_main_~c~0#1| 0) (= |ULTIMATE.start__strcmp_#res#1| 0) (<= 1 |#StackHeapBarrier|) (<= 0 |ULTIMATE.start_main_~x~0#1|) (not (= |ULTIMATE.start_main_#t~mem9#1| |ULTIMATE.start_main_#t~mem8#1|)) (= |ULTIMATE.start_main_~#b~0#1.offset| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (* |ULTIMATE.start_main_~x~0#1| 4)) |ULTIMATE.start_main_#t~mem8#1|) (<= |ULTIMATE.start_main_~x~0#1| 99999) (<= 2 |ULTIMATE.start_main_~#b~0#1.base|) (= |ULTIMATE.start_main_#t~mem9#1| (select (select |#memory_int| |ULTIMATE.start_main_~#b~0#1.base|) (* |ULTIMATE.start_main_~x~0#1| 4))) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 2 |ULTIMATE.start_main_~#a~0#1.base|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-11-12 00:45:35,416 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-12 00:45:35,416 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-12 00:45:35,417 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 9, 9] total 44 [2023-11-12 00:45:35,417 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1176208699] [2023-11-12 00:45:35,417 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-12 00:45:35,417 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 44 states [2023-11-12 00:45:35,418 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:45:35,419 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2023-11-12 00:45:35,420 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=499, Invalid=2257, Unknown=0, NotChecked=0, Total=2756 [2023-11-12 00:45:35,420 INFO L87 Difference]: Start difference. First operand 58 states and 60 transitions. Second operand has 44 states, 44 states have (on average 1.6363636363636365) internal successors, (72), 44 states have internal predecessors, (72), 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) [2023-11-12 00:45:36,670 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:45:36,670 INFO L93 Difference]: Finished difference Result 93 states and 98 transitions. [2023-11-12 00:45:36,670 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2023-11-12 00:45:36,670 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 44 states have (on average 1.6363636363636365) internal successors, (72), 44 states have internal predecessors, (72), 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 57 [2023-11-12 00:45:36,670 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:45:36,671 INFO L225 Difference]: With dead ends: 93 [2023-11-12 00:45:36,671 INFO L226 Difference]: Without dead ends: 63 [2023-11-12 00:45:36,675 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 228 GetRequests, 146 SyntacticMatches, 0 SemanticMatches, 82 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1432 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=1344, Invalid=5628, Unknown=0, NotChecked=0, Total=6972 [2023-11-12 00:45:36,676 INFO L413 NwaCegarLoop]: 6 mSDtfsCounter, 29 mSDsluCounter, 59 mSDsCounter, 0 mSdLazyCounter, 207 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 29 SdHoareTripleChecker+Valid, 65 SdHoareTripleChecker+Invalid, 209 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 207 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-12 00:45:36,676 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [29 Valid, 65 Invalid, 209 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 207 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-12 00:45:36,676 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2023-11-12 00:45:36,687 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 62. [2023-11-12 00:45:36,687 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 62 states, 61 states have (on average 1.0491803278688525) internal successors, (64), 61 states have internal predecessors, (64), 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) [2023-11-12 00:45:36,689 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 64 transitions. [2023-11-12 00:45:36,689 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 64 transitions. Word has length 57 [2023-11-12 00:45:36,689 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:45:36,689 INFO L495 AbstractCegarLoop]: Abstraction has 62 states and 64 transitions. [2023-11-12 00:45:36,690 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 44 states, 44 states have (on average 1.6363636363636365) internal successors, (72), 44 states have internal predecessors, (72), 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) [2023-11-12 00:45:36,690 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 64 transitions. [2023-11-12 00:45:36,692 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2023-11-12 00:45:36,692 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:45:36,693 INFO L195 NwaCegarLoop]: trace histogram [27, 10, 10, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:45:36,704 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_31dc3e1c-8ba3-427e-939b-6399229f744c/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2023-11-12 00:45:36,904 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_31dc3e1c-8ba3-427e-939b-6399229f744c/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2023-11-12 00:45:36,904 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 00:45:36,904 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:45:36,904 INFO L85 PathProgramCache]: Analyzing trace with hash -1614082974, now seen corresponding path program 3 times [2023-11-12 00:45:36,905 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:45:36,905 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1694270838] [2023-11-12 00:45:36,905 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:45:36,905 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:45:36,966 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:45:37,988 INFO L134 CoverageAnalysis]: Checked inductivity of 485 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 107 trivial. 0 not checked. [2023-11-12 00:45:37,988 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:45:37,988 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1694270838] [2023-11-12 00:45:37,988 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1694270838] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:45:37,988 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1704411346] [2023-11-12 00:45:37,988 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-11-12 00:45:37,989 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:45:37,989 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_31dc3e1c-8ba3-427e-939b-6399229f744c/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:45:37,990 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_31dc3e1c-8ba3-427e-939b-6399229f744c/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:45:38,028 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_31dc3e1c-8ba3-427e-939b-6399229f744c/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2023-11-12 00:45:38,228 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-11-12 00:45:38,228 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-12 00:45:38,232 INFO L262 TraceCheckSpWp]: Trace formula consists of 575 conjuncts, 12 conjunts are in the unsatisfiable core [2023-11-12 00:45:38,235 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:45:38,506 INFO L134 CoverageAnalysis]: Checked inductivity of 485 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 385 trivial. 0 not checked. [2023-11-12 00:45:38,506 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 00:45:38,873 INFO L134 CoverageAnalysis]: Checked inductivity of 485 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 385 trivial. 0 not checked. [2023-11-12 00:45:38,874 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1704411346] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-12 00:45:38,874 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [278652107] [2023-11-12 00:45:38,876 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2023-11-12 00:45:38,876 INFO L166 IcfgInterpreter]: Building call graph [2023-11-12 00:45:38,876 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-12 00:45:38,877 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-12 00:45:38,877 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-12 00:45:39,226 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-12 00:45:40,006 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3354#(and (= |ULTIMATE.start_main_~c~0#1| 0) (= |ULTIMATE.start__strcmp_#res#1| 0) (<= 1 |#StackHeapBarrier|) (<= 0 |ULTIMATE.start_main_~x~0#1|) (not (= |ULTIMATE.start_main_#t~mem9#1| |ULTIMATE.start_main_#t~mem8#1|)) (= |ULTIMATE.start_main_~#b~0#1.offset| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (* |ULTIMATE.start_main_~x~0#1| 4)) |ULTIMATE.start_main_#t~mem8#1|) (<= |ULTIMATE.start_main_~x~0#1| 99999) (<= 2 |ULTIMATE.start_main_~#b~0#1.base|) (= |ULTIMATE.start_main_#t~mem9#1| (select (select |#memory_int| |ULTIMATE.start_main_~#b~0#1.base|) (* |ULTIMATE.start_main_~x~0#1| 4))) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 2 |ULTIMATE.start_main_~#a~0#1.base|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-11-12 00:45:40,006 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-12 00:45:40,006 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-12 00:45:40,007 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 13, 13] total 52 [2023-11-12 00:45:40,007 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [4680705] [2023-11-12 00:45:40,007 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-12 00:45:40,007 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 52 states [2023-11-12 00:45:40,007 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:45:40,008 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2023-11-12 00:45:40,010 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=740, Invalid=2920, Unknown=0, NotChecked=0, Total=3660 [2023-11-12 00:45:40,011 INFO L87 Difference]: Start difference. First operand 62 states and 64 transitions. Second operand has 52 states, 52 states have (on average 1.6346153846153846) internal successors, (85), 52 states have internal predecessors, (85), 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) [2023-11-12 00:45:40,162 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:45:40,162 INFO L93 Difference]: Finished difference Result 120 states and 136 transitions. [2023-11-12 00:45:40,162 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2023-11-12 00:45:40,162 INFO L78 Accepts]: Start accepts. Automaton has has 52 states, 52 states have (on average 1.6346153846153846) internal successors, (85), 52 states have internal predecessors, (85), 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 61 [2023-11-12 00:45:40,163 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:45:40,163 INFO L225 Difference]: With dead ends: 120 [2023-11-12 00:45:40,163 INFO L226 Difference]: Without dead ends: 87 [2023-11-12 00:45:40,166 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 210 GetRequests, 151 SyntacticMatches, 0 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1129 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=740, Invalid=2920, Unknown=0, NotChecked=0, Total=3660 [2023-11-12 00:45:40,166 INFO L413 NwaCegarLoop]: 6 mSDtfsCounter, 2 mSDsluCounter, 61 mSDsCounter, 0 mSdLazyCounter, 133 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 67 SdHoareTripleChecker+Invalid, 135 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 133 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-12 00:45:40,167 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 67 Invalid, 135 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 133 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-12 00:45:40,167 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2023-11-12 00:45:40,180 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 87. [2023-11-12 00:45:40,180 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 87 states, 86 states have (on average 1.0348837209302326) internal successors, (89), 86 states have internal predecessors, (89), 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) [2023-11-12 00:45:40,181 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 89 transitions. [2023-11-12 00:45:40,181 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 89 transitions. Word has length 61 [2023-11-12 00:45:40,181 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:45:40,181 INFO L495 AbstractCegarLoop]: Abstraction has 87 states and 89 transitions. [2023-11-12 00:45:40,182 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 52 states, 52 states have (on average 1.6346153846153846) internal successors, (85), 52 states have internal predecessors, (85), 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) [2023-11-12 00:45:40,182 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 89 transitions. [2023-11-12 00:45:40,183 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2023-11-12 00:45:40,183 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:45:40,183 INFO L195 NwaCegarLoop]: trace histogram [28, 22, 22, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:45:40,194 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_31dc3e1c-8ba3-427e-939b-6399229f744c/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2023-11-12 00:45:40,389 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_31dc3e1c-8ba3-427e-939b-6399229f744c/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2023-11-12 00:45:40,390 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 00:45:40,390 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:45:40,390 INFO L85 PathProgramCache]: Analyzing trace with hash 1013026229, now seen corresponding path program 4 times [2023-11-12 00:45:40,390 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:45:40,390 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [644861870] [2023-11-12 00:45:40,390 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:45:40,391 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:45:40,457 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:45:41,544 INFO L134 CoverageAnalysis]: Checked inductivity of 897 backedges. 0 proven. 406 refuted. 0 times theorem prover too weak. 491 trivial. 0 not checked. [2023-11-12 00:45:41,544 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:45:41,544 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [644861870] [2023-11-12 00:45:41,544 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [644861870] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:45:41,544 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1044973163] [2023-11-12 00:45:41,544 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-11-12 00:45:41,544 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:45:41,545 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_31dc3e1c-8ba3-427e-939b-6399229f744c/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:45:41,553 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_31dc3e1c-8ba3-427e-939b-6399229f744c/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:45:41,592 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_31dc3e1c-8ba3-427e-939b-6399229f744c/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2023-11-12 00:45:41,896 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:45:41,900 INFO L262 TraceCheckSpWp]: Trace formula consists of 697 conjuncts, 30 conjunts are in the unsatisfiable core [2023-11-12 00:45:41,904 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:45:41,969 INFO L134 CoverageAnalysis]: Checked inductivity of 897 backedges. 0 proven. 406 refuted. 0 times theorem prover too weak. 491 trivial. 0 not checked. [2023-11-12 00:45:41,970 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 00:45:43,146 INFO L134 CoverageAnalysis]: Checked inductivity of 897 backedges. 0 proven. 406 refuted. 0 times theorem prover too weak. 491 trivial. 0 not checked. [2023-11-12 00:45:43,147 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1044973163] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-12 00:45:43,147 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1527883360] [2023-11-12 00:45:43,149 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2023-11-12 00:45:43,149 INFO L166 IcfgInterpreter]: Building call graph [2023-11-12 00:45:43,149 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-12 00:45:43,150 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-12 00:45:43,150 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-12 00:45:43,488 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-12 00:45:44,153 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4265#(and (= |ULTIMATE.start_main_~c~0#1| 0) (= |ULTIMATE.start__strcmp_#res#1| 0) (<= 1 |#StackHeapBarrier|) (<= 0 |ULTIMATE.start_main_~x~0#1|) (not (= |ULTIMATE.start_main_#t~mem9#1| |ULTIMATE.start_main_#t~mem8#1|)) (= |ULTIMATE.start_main_~#b~0#1.offset| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (* |ULTIMATE.start_main_~x~0#1| 4)) |ULTIMATE.start_main_#t~mem8#1|) (<= |ULTIMATE.start_main_~x~0#1| 99999) (<= 2 |ULTIMATE.start_main_~#b~0#1.base|) (= |ULTIMATE.start_main_#t~mem9#1| (select (select |#memory_int| |ULTIMATE.start_main_~#b~0#1.base|) (* |ULTIMATE.start_main_~x~0#1| 4))) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 2 |ULTIMATE.start_main_~#a~0#1.base|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-11-12 00:45:44,153 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-12 00:45:44,154 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-12 00:45:44,154 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30, 30] total 60 [2023-11-12 00:45:44,154 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1287837623] [2023-11-12 00:45:44,154 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-12 00:45:44,155 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 61 states [2023-11-12 00:45:44,155 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:45:44,157 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants. [2023-11-12 00:45:44,158 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1860, Invalid=2970, Unknown=0, NotChecked=0, Total=4830 [2023-11-12 00:45:44,159 INFO L87 Difference]: Start difference. First operand 87 states and 89 transitions. Second operand has 61 states, 61 states have (on average 1.180327868852459) internal successors, (72), 60 states have internal predecessors, (72), 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) [2023-11-12 00:45:44,290 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:45:44,291 INFO L93 Difference]: Finished difference Result 174 states and 207 transitions. [2023-11-12 00:45:44,291 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2023-11-12 00:45:44,292 INFO L78 Accepts]: Start accepts. Automaton has has 61 states, 61 states have (on average 1.180327868852459) internal successors, (72), 60 states have internal predecessors, (72), 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 86 [2023-11-12 00:45:44,292 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:45:44,293 INFO L225 Difference]: With dead ends: 174 [2023-11-12 00:45:44,293 INFO L226 Difference]: Without dead ends: 117 [2023-11-12 00:45:44,295 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 286 GetRequests, 218 SyntacticMatches, 0 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 908 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=1860, Invalid=2970, Unknown=0, NotChecked=0, Total=4830 [2023-11-12 00:45:44,296 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 0 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 70 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 24 SdHoareTripleChecker+Invalid, 71 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 70 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-12 00:45:44,297 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 24 Invalid, 71 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 70 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-12 00:45:44,297 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 117 states. [2023-11-12 00:45:44,319 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 117 to 117. [2023-11-12 00:45:44,320 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 117 states, 116 states have (on average 1.0258620689655173) internal successors, (119), 116 states have internal predecessors, (119), 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) [2023-11-12 00:45:44,320 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 117 states to 117 states and 119 transitions. [2023-11-12 00:45:44,321 INFO L78 Accepts]: Start accepts. Automaton has 117 states and 119 transitions. Word has length 86 [2023-11-12 00:45:44,321 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:45:44,321 INFO L495 AbstractCegarLoop]: Abstraction has 117 states and 119 transitions. [2023-11-12 00:45:44,322 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 61 states, 61 states have (on average 1.180327868852459) internal successors, (72), 60 states have internal predecessors, (72), 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) [2023-11-12 00:45:44,322 INFO L276 IsEmpty]: Start isEmpty. Operand 117 states and 119 transitions. [2023-11-12 00:45:44,323 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2023-11-12 00:45:44,324 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:45:44,324 INFO L195 NwaCegarLoop]: trace histogram [58, 22, 22, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:45:44,337 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_31dc3e1c-8ba3-427e-939b-6399229f744c/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2023-11-12 00:45:44,530 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_31dc3e1c-8ba3-427e-939b-6399229f744c/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2023-11-12 00:45:44,531 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 00:45:44,531 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:45:44,531 INFO L85 PathProgramCache]: Analyzing trace with hash -1412161899, now seen corresponding path program 5 times [2023-11-12 00:45:44,532 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:45:44,532 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [754245917] [2023-11-12 00:45:44,532 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:45:44,532 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:45:44,673 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:45:48,105 INFO L134 CoverageAnalysis]: Checked inductivity of 2202 backedges. 0 proven. 1711 refuted. 0 times theorem prover too weak. 491 trivial. 0 not checked. [2023-11-12 00:45:48,105 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:45:48,105 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [754245917] [2023-11-12 00:45:48,105 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [754245917] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:45:48,106 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [443524816] [2023-11-12 00:45:48,106 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-12 00:45:48,106 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:45:48,106 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_31dc3e1c-8ba3-427e-939b-6399229f744c/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:45:48,107 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_31dc3e1c-8ba3-427e-939b-6399229f744c/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:45:48,109 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_31dc3e1c-8ba3-427e-939b-6399229f744c/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2023-11-12 00:45:49,636 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2023-11-12 00:45:49,636 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-12 00:45:49,641 INFO L262 TraceCheckSpWp]: Trace formula consists of 329 conjuncts, 53 conjunts are in the unsatisfiable core [2023-11-12 00:45:49,645 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:45:50,729 INFO L134 CoverageAnalysis]: Checked inductivity of 2202 backedges. 0 proven. 130 refuted. 0 times theorem prover too weak. 2072 trivial. 0 not checked. [2023-11-12 00:45:50,729 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 00:45:51,319 INFO L322 Elim1Store]: treesize reduction 15, result has 83.5 percent of original size [2023-11-12 00:45:51,320 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 36 treesize of output 83 [2023-11-12 00:45:52,131 INFO L134 CoverageAnalysis]: Checked inductivity of 2202 backedges. 19 proven. 111 refuted. 0 times theorem prover too weak. 2072 trivial. 0 not checked. [2023-11-12 00:45:52,132 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [443524816] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-12 00:45:52,132 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1214150003] [2023-11-12 00:45:52,136 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2023-11-12 00:45:52,136 INFO L166 IcfgInterpreter]: Building call graph [2023-11-12 00:45:52,136 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-12 00:45:52,137 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-12 00:45:52,137 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-12 00:45:52,465 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-12 00:45:53,569 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5533#(and (= |ULTIMATE.start_main_~c~0#1| 0) (= |ULTIMATE.start__strcmp_#res#1| 0) (<= 1 |#StackHeapBarrier|) (<= 0 |ULTIMATE.start_main_~x~0#1|) (not (= |ULTIMATE.start_main_#t~mem9#1| |ULTIMATE.start_main_#t~mem8#1|)) (= |ULTIMATE.start_main_~#b~0#1.offset| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (* |ULTIMATE.start_main_~x~0#1| 4)) |ULTIMATE.start_main_#t~mem8#1|) (<= |ULTIMATE.start_main_~x~0#1| 99999) (<= 2 |ULTIMATE.start_main_~#b~0#1.base|) (= |ULTIMATE.start_main_#t~mem9#1| (select (select |#memory_int| |ULTIMATE.start_main_~#b~0#1.base|) (* |ULTIMATE.start_main_~x~0#1| 4))) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 2 |ULTIMATE.start_main_~#a~0#1.base|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-11-12 00:45:53,569 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-12 00:45:53,569 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-12 00:45:53,569 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [60, 12, 12] total 82 [2023-11-12 00:45:53,569 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [637139730] [2023-11-12 00:45:53,570 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-12 00:45:53,570 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 82 states [2023-11-12 00:45:53,570 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:45:53,572 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 82 interpolants. [2023-11-12 00:45:53,574 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1952, Invalid=6238, Unknown=0, NotChecked=0, Total=8190 [2023-11-12 00:45:53,575 INFO L87 Difference]: Start difference. First operand 117 states and 119 transitions. Second operand has 82 states, 82 states have (on average 1.3902439024390243) internal successors, (114), 82 states have internal predecessors, (114), 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) [2023-11-12 00:45:57,178 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:45:57,178 INFO L93 Difference]: Finished difference Result 179 states and 184 transitions. [2023-11-12 00:45:57,179 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 76 states. [2023-11-12 00:45:57,179 INFO L78 Accepts]: Start accepts. Automaton has has 82 states, 82 states have (on average 1.3902439024390243) internal successors, (114), 82 states have internal predecessors, (114), 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 116 [2023-11-12 00:45:57,179 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:45:57,180 INFO L225 Difference]: With dead ends: 179 [2023-11-12 00:45:57,180 INFO L226 Difference]: Without dead ends: 122 [2023-11-12 00:45:57,188 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 471 GetRequests, 317 SyntacticMatches, 0 SemanticMatches, 154 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4684 ImplicationChecksByTransitivity, 7.2s TimeCoverageRelationStatistics Valid=5668, Invalid=18512, Unknown=0, NotChecked=0, Total=24180 [2023-11-12 00:45:57,189 INFO L413 NwaCegarLoop]: 6 mSDtfsCounter, 25 mSDsluCounter, 98 mSDsCounter, 0 mSdLazyCounter, 449 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 25 SdHoareTripleChecker+Valid, 104 SdHoareTripleChecker+Invalid, 453 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 449 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-11-12 00:45:57,189 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [25 Valid, 104 Invalid, 453 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 449 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-11-12 00:45:57,190 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 122 states. [2023-11-12 00:45:57,204 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 122 to 121. [2023-11-12 00:45:57,204 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 121 states, 120 states have (on average 1.025) internal successors, (123), 120 states have internal predecessors, (123), 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) [2023-11-12 00:45:57,205 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 121 states to 121 states and 123 transitions. [2023-11-12 00:45:57,205 INFO L78 Accepts]: Start accepts. Automaton has 121 states and 123 transitions. Word has length 116 [2023-11-12 00:45:57,205 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:45:57,205 INFO L495 AbstractCegarLoop]: Abstraction has 121 states and 123 transitions. [2023-11-12 00:45:57,205 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 82 states, 82 states have (on average 1.3902439024390243) internal successors, (114), 82 states have internal predecessors, (114), 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) [2023-11-12 00:45:57,205 INFO L276 IsEmpty]: Start isEmpty. Operand 121 states and 123 transitions. [2023-11-12 00:45:57,206 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 121 [2023-11-12 00:45:57,207 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:45:57,207 INFO L195 NwaCegarLoop]: trace histogram [59, 22, 22, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:45:57,213 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_31dc3e1c-8ba3-427e-939b-6399229f744c/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2023-11-12 00:45:57,412 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13,13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_31dc3e1c-8ba3-427e-939b-6399229f744c/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:45:57,413 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 00:45:57,413 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:45:57,413 INFO L85 PathProgramCache]: Analyzing trace with hash -846607899, now seen corresponding path program 6 times [2023-11-12 00:45:57,413 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:45:57,414 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [333460876] [2023-11-12 00:45:57,414 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:45:57,414 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:45:57,531 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:46:00,980 INFO L134 CoverageAnalysis]: Checked inductivity of 2269 backedges. 0 proven. 1770 refuted. 0 times theorem prover too weak. 499 trivial. 0 not checked. [2023-11-12 00:46:00,980 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:46:00,980 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [333460876] [2023-11-12 00:46:00,980 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [333460876] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:46:00,980 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [306308904] [2023-11-12 00:46:00,980 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-11-12 00:46:00,981 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:46:00,981 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_31dc3e1c-8ba3-427e-939b-6399229f744c/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:46:00,982 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_31dc3e1c-8ba3-427e-939b-6399229f744c/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:46:00,992 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_31dc3e1c-8ba3-427e-939b-6399229f744c/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2023-11-12 00:46:01,480 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-11-12 00:46:01,480 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-12 00:46:01,487 INFO L262 TraceCheckSpWp]: Trace formula consists of 1143 conjuncts, 24 conjunts are in the unsatisfiable core [2023-11-12 00:46:01,492 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:46:02,433 INFO L134 CoverageAnalysis]: Checked inductivity of 2269 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 1785 trivial. 0 not checked. [2023-11-12 00:46:02,433 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 00:46:03,754 INFO L134 CoverageAnalysis]: Checked inductivity of 2269 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 1785 trivial. 0 not checked. [2023-11-12 00:46:03,755 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [306308904] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-12 00:46:03,755 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2029463032] [2023-11-12 00:46:03,757 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2023-11-12 00:46:03,757 INFO L166 IcfgInterpreter]: Building call graph [2023-11-12 00:46:03,757 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-12 00:46:03,757 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-12 00:46:03,758 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-12 00:46:04,017 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-12 00:46:05,039 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6994#(and (= |ULTIMATE.start_main_~c~0#1| 0) (= |ULTIMATE.start__strcmp_#res#1| 0) (<= 1 |#StackHeapBarrier|) (<= 0 |ULTIMATE.start_main_~x~0#1|) (not (= |ULTIMATE.start_main_#t~mem9#1| |ULTIMATE.start_main_#t~mem8#1|)) (= |ULTIMATE.start_main_~#b~0#1.offset| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (* |ULTIMATE.start_main_~x~0#1| 4)) |ULTIMATE.start_main_#t~mem8#1|) (<= |ULTIMATE.start_main_~x~0#1| 99999) (<= 2 |ULTIMATE.start_main_~#b~0#1.base|) (= |ULTIMATE.start_main_#t~mem9#1| (select (select |#memory_int| |ULTIMATE.start_main_~#b~0#1.base|) (* |ULTIMATE.start_main_~x~0#1| 4))) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 2 |ULTIMATE.start_main_~#a~0#1.base|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-11-12 00:46:05,039 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-12 00:46:05,039 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-12 00:46:05,040 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [61, 25, 25] total 108 [2023-11-12 00:46:05,040 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [554765543] [2023-11-12 00:46:05,040 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-12 00:46:05,041 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 108 states [2023-11-12 00:46:05,041 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:46:05,043 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 108 interpolants. [2023-11-12 00:46:05,044 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3048, Invalid=10524, Unknown=0, NotChecked=0, Total=13572 [2023-11-12 00:46:05,044 INFO L87 Difference]: Start difference. First operand 121 states and 123 transitions. Second operand has 108 states, 108 states have (on average 1.5277777777777777) internal successors, (165), 108 states have internal predecessors, (165), 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) [2023-11-12 00:46:05,317 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:46:05,317 INFO L93 Difference]: Finished difference Result 230 states and 258 transitions. [2023-11-12 00:46:05,317 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 108 states. [2023-11-12 00:46:05,318 INFO L78 Accepts]: Start accepts. Automaton has has 108 states, 108 states have (on average 1.5277777777777777) internal successors, (165), 108 states have internal predecessors, (165), 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 120 [2023-11-12 00:46:05,318 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:46:05,320 INFO L225 Difference]: With dead ends: 230 [2023-11-12 00:46:05,320 INFO L226 Difference]: Without dead ends: 170 [2023-11-12 00:46:05,322 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 419 GetRequests, 304 SyntacticMatches, 0 SemanticMatches, 115 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3861 ImplicationChecksByTransitivity, 4.8s TimeCoverageRelationStatistics Valid=3048, Invalid=10524, Unknown=0, NotChecked=0, Total=13572 [2023-11-12 00:46:05,323 INFO L413 NwaCegarLoop]: 6 mSDtfsCounter, 2 mSDsluCounter, 37 mSDsCounter, 0 mSdLazyCounter, 193 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 43 SdHoareTripleChecker+Invalid, 195 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 193 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-12 00:46:05,323 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 43 Invalid, 195 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 193 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-12 00:46:05,324 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 170 states. [2023-11-12 00:46:05,343 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 170 to 170. [2023-11-12 00:46:05,344 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 170 states, 169 states have (on average 1.017751479289941) internal successors, (172), 169 states have internal predecessors, (172), 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) [2023-11-12 00:46:05,345 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 170 states to 170 states and 172 transitions. [2023-11-12 00:46:05,345 INFO L78 Accepts]: Start accepts. Automaton has 170 states and 172 transitions. Word has length 120 [2023-11-12 00:46:05,345 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:46:05,345 INFO L495 AbstractCegarLoop]: Abstraction has 170 states and 172 transitions. [2023-11-12 00:46:05,346 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 108 states, 108 states have (on average 1.5277777777777777) internal successors, (165), 108 states have internal predecessors, (165), 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) [2023-11-12 00:46:05,346 INFO L276 IsEmpty]: Start isEmpty. Operand 170 states and 172 transitions. [2023-11-12 00:46:05,348 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 170 [2023-11-12 00:46:05,348 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:46:05,348 INFO L195 NwaCegarLoop]: trace histogram [60, 46, 46, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:46:05,357 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_31dc3e1c-8ba3-427e-939b-6399229f744c/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Ended with exit code 0 [2023-11-12 00:46:05,555 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_31dc3e1c-8ba3-427e-939b-6399229f744c/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2023-11-12 00:46:05,555 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 00:46:05,555 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:46:05,556 INFO L85 PathProgramCache]: Analyzing trace with hash 1356230134, now seen corresponding path program 7 times [2023-11-12 00:46:05,556 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:46:05,556 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [585959602] [2023-11-12 00:46:05,556 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:46:05,556 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:46:05,680 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat