./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/array-examples/standard_two_index_05.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_1c814484-a2e4-4e57-9a58-6042933563da/bin/utaipan-verify-NcY6lQBIFX/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c814484-a2e4-4e57-9a58-6042933563da/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_1c814484-a2e4-4e57-9a58-6042933563da/bin/utaipan-verify-NcY6lQBIFX/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c814484-a2e4-4e57-9a58-6042933563da/bin/utaipan-verify-NcY6lQBIFX/config/TaipanReach.xml -i ../../sv-benchmarks/c/array-examples/standard_two_index_05.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c814484-a2e4-4e57-9a58-6042933563da/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_1c814484-a2e4-4e57-9a58-6042933563da/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 3fc114fbbcfc36c9c941771d8fca06798b1529d5817554239fb5f8a03a84a489 --- Real Ultimate output --- This is Ultimate 0.2.3-dev-cf1a783 [2023-11-12 00:56:31,080 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-12 00:56:31,194 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c814484-a2e4-4e57-9a58-6042933563da/bin/utaipan-verify-NcY6lQBIFX/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-11-12 00:56:31,204 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-12 00:56:31,204 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-12 00:56:31,246 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-12 00:56:31,247 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-12 00:56:31,247 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-12 00:56:31,248 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-12 00:56:31,254 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-12 00:56:31,254 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-12 00:56:31,255 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-12 00:56:31,256 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-12 00:56:31,257 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-12 00:56:31,258 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-12 00:56:31,258 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-12 00:56:31,259 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-12 00:56:31,259 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-12 00:56:31,259 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-12 00:56:31,260 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-12 00:56:31,260 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-12 00:56:31,261 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-12 00:56:31,262 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-12 00:56:31,262 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-11-12 00:56:31,263 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-12 00:56:31,263 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-12 00:56:31,264 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-12 00:56:31,264 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-12 00:56:31,265 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-11-12 00:56:31,265 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-12 00:56:31,266 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-11-12 00:56:31,267 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-12 00:56:31,267 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-11-12 00:56:31,267 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-12 00:56:31,267 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-12 00:56:31,268 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-12 00:56:31,268 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-12 00:56:31,268 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-12 00:56:31,268 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-12 00:56:31,269 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-11-12 00:56:31,269 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-12 00:56:31,269 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-12 00:56:31,269 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-11-12 00:56:31,270 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-12 00:56:31,270 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-12 00:56:31,271 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_1c814484-a2e4-4e57-9a58-6042933563da/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c814484-a2e4-4e57-9a58-6042933563da/bin/utaipan-verify-NcY6lQBIFX Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 3fc114fbbcfc36c9c941771d8fca06798b1529d5817554239fb5f8a03a84a489 [2023-11-12 00:56:31,613 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-12 00:56:31,647 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-12 00:56:31,649 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-12 00:56:31,651 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-12 00:56:31,651 INFO L274 PluginConnector]: CDTParser initialized [2023-11-12 00:56:31,653 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c814484-a2e4-4e57-9a58-6042933563da/bin/utaipan-verify-NcY6lQBIFX/../../sv-benchmarks/c/array-examples/standard_two_index_05.i [2023-11-12 00:56:34,701 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-12 00:56:34,939 INFO L384 CDTParser]: Found 1 translation units. [2023-11-12 00:56:34,940 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c814484-a2e4-4e57-9a58-6042933563da/sv-benchmarks/c/array-examples/standard_two_index_05.i [2023-11-12 00:56:34,948 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c814484-a2e4-4e57-9a58-6042933563da/bin/utaipan-verify-NcY6lQBIFX/data/81cc968aa/a26f1fb4cfda4b7a84e5bd0056e3e768/FLAGd0e796eea [2023-11-12 00:56:34,964 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c814484-a2e4-4e57-9a58-6042933563da/bin/utaipan-verify-NcY6lQBIFX/data/81cc968aa/a26f1fb4cfda4b7a84e5bd0056e3e768 [2023-11-12 00:56:34,966 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-12 00:56:34,968 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-12 00:56:34,970 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-12 00:56:34,970 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-12 00:56:34,976 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-12 00:56:34,977 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 12.11 12:56:34" (1/1) ... [2023-11-12 00:56:34,978 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@339da3d7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:56:34, skipping insertion in model container [2023-11-12 00:56:34,978 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 12.11 12:56:34" (1/1) ... [2023-11-12 00:56:35,010 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-12 00:56:35,218 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_1c814484-a2e4-4e57-9a58-6042933563da/sv-benchmarks/c/array-examples/standard_two_index_05.i[814,827] [2023-11-12 00:56:35,234 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-12 00:56:35,243 INFO L202 MainTranslator]: Completed pre-run [2023-11-12 00:56:35,254 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_1c814484-a2e4-4e57-9a58-6042933563da/sv-benchmarks/c/array-examples/standard_two_index_05.i[814,827] [2023-11-12 00:56:35,260 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-12 00:56:35,275 INFO L206 MainTranslator]: Completed translation [2023-11-12 00:56:35,275 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:56:35 WrapperNode [2023-11-12 00:56:35,276 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-12 00:56:35,277 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-12 00:56:35,277 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-12 00:56:35,277 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-12 00:56:35,285 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:56:35" (1/1) ... [2023-11-12 00:56:35,292 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:56:35" (1/1) ... [2023-11-12 00:56:35,312 INFO L138 Inliner]: procedures = 16, calls = 18, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 59 [2023-11-12 00:56:35,312 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-12 00:56:35,313 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-12 00:56:35,313 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-12 00:56:35,314 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-12 00:56:35,320 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:56:35" (1/1) ... [2023-11-12 00:56:35,321 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:56:35" (1/1) ... [2023-11-12 00:56:35,323 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:56:35" (1/1) ... [2023-11-12 00:56:35,323 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:56:35" (1/1) ... [2023-11-12 00:56:35,328 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:56:35" (1/1) ... [2023-11-12 00:56:35,332 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:56:35" (1/1) ... [2023-11-12 00:56:35,333 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:56:35" (1/1) ... [2023-11-12 00:56:35,335 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:56:35" (1/1) ... [2023-11-12 00:56:35,337 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-12 00:56:35,338 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-12 00:56:35,338 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-12 00:56:35,338 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-12 00:56:35,339 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:56:35" (1/1) ... [2023-11-12 00:56:35,348 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-12 00:56:35,364 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c814484-a2e4-4e57-9a58-6042933563da/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:56:35,376 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c814484-a2e4-4e57-9a58-6042933563da/bin/utaipan-verify-NcY6lQBIFX/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-12 00:56:35,415 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c814484-a2e4-4e57-9a58-6042933563da/bin/utaipan-verify-NcY6lQBIFX/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-12 00:56:35,431 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-12 00:56:35,431 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-12 00:56:35,431 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-11-12 00:56:35,431 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-11-12 00:56:35,432 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-12 00:56:35,432 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-12 00:56:35,435 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-11-12 00:56:35,436 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-11-12 00:56:35,529 INFO L236 CfgBuilder]: Building ICFG [2023-11-12 00:56:35,532 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-12 00:56:35,785 INFO L277 CfgBuilder]: Performing block encoding [2023-11-12 00:56:35,817 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-12 00:56:35,817 INFO L302 CfgBuilder]: Removed 3 assume(true) statements. [2023-11-12 00:56:35,820 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 12.11 12:56:35 BoogieIcfgContainer [2023-11-12 00:56:35,820 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-12 00:56:35,822 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-12 00:56:35,822 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-12 00:56:35,826 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-12 00:56:35,826 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 12.11 12:56:34" (1/3) ... [2023-11-12 00:56:35,827 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@693ee066 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 12.11 12:56:35, skipping insertion in model container [2023-11-12 00:56:35,827 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:56:35" (2/3) ... [2023-11-12 00:56:35,828 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@693ee066 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 12.11 12:56:35, skipping insertion in model container [2023-11-12 00:56:35,828 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 12.11 12:56:35" (3/3) ... [2023-11-12 00:56:35,829 INFO L112 eAbstractionObserver]: Analyzing ICFG standard_two_index_05.i [2023-11-12 00:56:35,850 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-12 00:56:35,851 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-11-12 00:56:35,911 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-12 00:56:35,920 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;@2dfea2dd, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-12 00:56:35,921 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-11-12 00:56:35,926 INFO L276 IsEmpty]: Start isEmpty. Operand has 9 states, 7 states have (on average 1.7142857142857142) internal successors, (12), 8 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:56:35,933 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2023-11-12 00:56:35,933 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:56:35,934 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2023-11-12 00:56:35,935 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 00:56:35,941 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:56:35,941 INFO L85 PathProgramCache]: Analyzing trace with hash -1747889330, now seen corresponding path program 1 times [2023-11-12 00:56:35,955 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:56:35,956 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2077766691] [2023-11-12 00:56:35,956 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:56:35,957 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:56:36,083 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:56:36,232 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 00:56:36,232 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:56:36,233 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2077766691] [2023-11-12 00:56:36,233 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2077766691] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 00:56:36,234 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-12 00:56:36,234 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-12 00:56:36,236 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1084443054] [2023-11-12 00:56:36,237 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 00:56:36,241 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-12 00:56:36,241 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:56:36,279 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-12 00:56:36,280 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-12 00:56:36,282 INFO L87 Difference]: Start difference. First operand has 9 states, 7 states have (on average 1.7142857142857142) internal successors, (12), 8 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 3 states have (on average 2.0) internal successors, (6), 2 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:56:36,337 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:56:36,337 INFO L93 Difference]: Finished difference Result 17 states and 23 transitions. [2023-11-12 00:56:36,339 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-12 00:56:36,340 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.0) internal successors, (6), 2 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2023-11-12 00:56:36,340 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:56:36,349 INFO L225 Difference]: With dead ends: 17 [2023-11-12 00:56:36,349 INFO L226 Difference]: Without dead ends: 9 [2023-11-12 00:56:36,353 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 00:56:36,357 INFO L413 NwaCegarLoop]: 6 mSDtfsCounter, 0 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 12 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 9 SdHoareTripleChecker+Invalid, 12 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 12 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-12 00:56:36,359 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 9 Invalid, 12 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 12 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-12 00:56:36,378 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9 states. [2023-11-12 00:56:36,389 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9 to 9. [2023-11-12 00:56:36,391 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9 states, 8 states have (on average 1.375) internal successors, (11), 8 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 00:56:36,392 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9 states to 9 states and 11 transitions. [2023-11-12 00:56:36,393 INFO L78 Accepts]: Start accepts. Automaton has 9 states and 11 transitions. Word has length 6 [2023-11-12 00:56:36,394 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:56:36,394 INFO L495 AbstractCegarLoop]: Abstraction has 9 states and 11 transitions. [2023-11-12 00:56:36,395 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.0) internal successors, (6), 2 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:56:36,395 INFO L276 IsEmpty]: Start isEmpty. Operand 9 states and 11 transitions. [2023-11-12 00:56:36,395 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2023-11-12 00:56:36,395 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:56:36,396 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:56:36,396 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-12 00:56:36,396 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 00:56:36,398 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:56:36,398 INFO L85 PathProgramCache]: Analyzing trace with hash 274671409, now seen corresponding path program 1 times [2023-11-12 00:56:36,398 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:56:36,399 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [303965319] [2023-11-12 00:56:36,399 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:56:36,399 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:56:36,422 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:56:36,487 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 00:56:36,487 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:56:36,487 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [303965319] [2023-11-12 00:56:36,488 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [303965319] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:56:36,488 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1386719233] [2023-11-12 00:56:36,488 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:56:36,488 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:56:36,489 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c814484-a2e4-4e57-9a58-6042933563da/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:56:36,492 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c814484-a2e4-4e57-9a58-6042933563da/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:56:36,501 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c814484-a2e4-4e57-9a58-6042933563da/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-12 00:56:36,562 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:56:36,564 INFO L262 TraceCheckSpWp]: Trace formula consists of 72 conjuncts, 2 conjunts are in the unsatisfiable core [2023-11-12 00:56:36,569 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:56:36,582 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 00:56:36,583 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-12 00:56:36,583 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1386719233] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 00:56:36,583 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-12 00:56:36,583 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [3] total 4 [2023-11-12 00:56:36,584 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1244207748] [2023-11-12 00:56:36,584 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 00:56:36,585 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-12 00:56:36,585 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:56:36,586 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-12 00:56:36,586 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-11-12 00:56:36,587 INFO L87 Difference]: Start difference. First operand 9 states and 11 transitions. Second operand has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 3 states have internal predecessors, (7), 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 00:56:36,610 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:56:36,610 INFO L93 Difference]: Finished difference Result 20 states and 23 transitions. [2023-11-12 00:56:36,611 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-12 00:56:36,611 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 3 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2023-11-12 00:56:36,611 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:56:36,612 INFO L225 Difference]: With dead ends: 20 [2023-11-12 00:56:36,612 INFO L226 Difference]: Without dead ends: 15 [2023-11-12 00:56:36,612 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-11-12 00:56:36,614 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 4 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 11 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 6 SdHoareTripleChecker+Invalid, 13 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 11 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-12 00:56:36,615 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [4 Valid, 6 Invalid, 13 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 11 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-12 00:56:36,616 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2023-11-12 00:56:36,618 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 10. [2023-11-12 00:56:36,618 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 10 states, 9 states have (on average 1.3333333333333333) internal successors, (12), 9 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:56:36,619 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10 states to 10 states and 12 transitions. [2023-11-12 00:56:36,619 INFO L78 Accepts]: Start accepts. Automaton has 10 states and 12 transitions. Word has length 7 [2023-11-12 00:56:36,619 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:56:36,619 INFO L495 AbstractCegarLoop]: Abstraction has 10 states and 12 transitions. [2023-11-12 00:56:36,620 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 3 states have internal predecessors, (7), 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 00:56:36,620 INFO L276 IsEmpty]: Start isEmpty. Operand 10 states and 12 transitions. [2023-11-12 00:56:36,620 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2023-11-12 00:56:36,620 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:56:36,620 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:56:36,635 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c814484-a2e4-4e57-9a58-6042933563da/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-11-12 00:56:36,826 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c814484-a2e4-4e57-9a58-6042933563da/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2023-11-12 00:56:36,827 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 00:56:36,828 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:56:36,828 INFO L85 PathProgramCache]: Analyzing trace with hash -108579109, now seen corresponding path program 1 times [2023-11-12 00:56:36,828 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:56:36,829 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [610327789] [2023-11-12 00:56:36,829 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:56:36,829 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:56:36,846 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:56:36,932 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 00:56:36,933 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:56:36,933 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [610327789] [2023-11-12 00:56:36,933 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [610327789] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:56:36,934 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1178261755] [2023-11-12 00:56:36,934 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:56:36,934 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:56:36,934 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c814484-a2e4-4e57-9a58-6042933563da/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:56:36,936 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c814484-a2e4-4e57-9a58-6042933563da/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:56:36,946 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c814484-a2e4-4e57-9a58-6042933563da/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-12 00:56:37,038 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:56:37,040 INFO L262 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 3 conjunts are in the unsatisfiable core [2023-11-12 00:56:37,041 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:56:37,079 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 00:56:37,087 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 00:56:37,121 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 00:56:37,121 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1178261755] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-12 00:56:37,121 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [294332345] [2023-11-12 00:56:37,141 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2023-11-12 00:56:37,142 INFO L166 IcfgInterpreter]: Building call graph [2023-11-12 00:56:37,145 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-12 00:56:37,150 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-12 00:56:37,151 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-12 00:56:37,849 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-12 00:56:38,077 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '164#(and (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_main_#t~mem3#1| (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) 0)) (= |ULTIMATE.start_main_~#b~0#1.offset| 0) (not (= |ULTIMATE.start_main_#t~mem4#1| |ULTIMATE.start_main_#t~mem3#1|)) (<= 2 |ULTIMATE.start_main_~#b~0#1.base|) (= |ULTIMATE.start_main_~i~0#1| 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) (= (select (select |#memory_int| |ULTIMATE.start_main_~#b~0#1.base|) 4) |ULTIMATE.start_main_#t~mem4#1|) (= |ULTIMATE.start_main_~j~0#1| 0))' at error location [2023-11-12 00:56:38,077 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-12 00:56:38,078 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-12 00:56:38,078 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 6 [2023-11-12 00:56:38,078 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1726012356] [2023-11-12 00:56:38,078 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-12 00:56:38,079 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-11-12 00:56:38,080 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:56:38,081 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-11-12 00:56:38,082 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=83, Unknown=0, NotChecked=0, Total=132 [2023-11-12 00:56:38,082 INFO L87 Difference]: Start difference. First operand 10 states and 12 transitions. Second operand has 7 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 6 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 00:56:38,137 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:56:38,138 INFO L93 Difference]: Finished difference Result 31 states and 38 transitions. [2023-11-12 00:56:38,138 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-12 00:56:38,139 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 6 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 8 [2023-11-12 00:56:38,139 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:56:38,140 INFO L225 Difference]: With dead ends: 31 [2023-11-12 00:56:38,140 INFO L226 Difference]: Without dead ends: 24 [2023-11-12 00:56:38,142 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=49, Invalid=83, Unknown=0, NotChecked=0, Total=132 [2023-11-12 00:56:38,146 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 15 mSDsluCounter, 9 mSDsCounter, 0 mSdLazyCounter, 22 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 12 SdHoareTripleChecker+Invalid, 31 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 22 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-12 00:56:38,148 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [15 Valid, 12 Invalid, 31 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 22 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-12 00:56:38,150 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2023-11-12 00:56:38,157 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 14. [2023-11-12 00:56:38,158 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14 states, 13 states have (on average 1.2307692307692308) internal successors, (16), 13 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:56:38,158 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 16 transitions. [2023-11-12 00:56:38,159 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 16 transitions. Word has length 8 [2023-11-12 00:56:38,159 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:56:38,159 INFO L495 AbstractCegarLoop]: Abstraction has 14 states and 16 transitions. [2023-11-12 00:56:38,159 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 6 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 00:56:38,159 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 16 transitions. [2023-11-12 00:56:38,160 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2023-11-12 00:56:38,160 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:56:38,160 INFO L195 NwaCegarLoop]: trace histogram [4, 2, 1, 1, 1, 1, 1, 1] [2023-11-12 00:56:38,171 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c814484-a2e4-4e57-9a58-6042933563da/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-11-12 00:56:38,365 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c814484-a2e4-4e57-9a58-6042933563da/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2023-11-12 00:56:38,366 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 00:56:38,366 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:56:38,367 INFO L85 PathProgramCache]: Analyzing trace with hash -1284839922, now seen corresponding path program 2 times [2023-11-12 00:56:38,367 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:56:38,367 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1715432259] [2023-11-12 00:56:38,367 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:56:38,367 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:56:38,426 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:56:38,553 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-11-12 00:56:38,554 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:56:38,556 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1715432259] [2023-11-12 00:56:38,558 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1715432259] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:56:38,558 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [398899574] [2023-11-12 00:56:38,558 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-12 00:56:38,558 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:56:38,559 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c814484-a2e4-4e57-9a58-6042933563da/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:56:38,560 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c814484-a2e4-4e57-9a58-6042933563da/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:56:38,587 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c814484-a2e4-4e57-9a58-6042933563da/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-12 00:56:38,641 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2023-11-12 00:56:38,641 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-12 00:56:38,642 INFO L262 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 4 conjunts are in the unsatisfiable core [2023-11-12 00:56:38,646 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:56:38,659 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-11-12 00:56:38,659 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 00:56:38,686 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-11-12 00:56:38,686 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [398899574] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-12 00:56:38,687 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1625771647] [2023-11-12 00:56:38,689 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2023-11-12 00:56:38,689 INFO L166 IcfgInterpreter]: Building call graph [2023-11-12 00:56:38,690 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-12 00:56:38,690 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-12 00:56:38,690 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-12 00:56:38,993 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-12 00:56:39,198 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '312#(and (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_main_#t~mem3#1| (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) 0)) (= |ULTIMATE.start_main_~#b~0#1.offset| 0) (not (= |ULTIMATE.start_main_#t~mem4#1| |ULTIMATE.start_main_#t~mem3#1|)) (<= 2 |ULTIMATE.start_main_~#b~0#1.base|) (= |ULTIMATE.start_main_~i~0#1| 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) (= (select (select |#memory_int| |ULTIMATE.start_main_~#b~0#1.base|) 4) |ULTIMATE.start_main_#t~mem4#1|) (= |ULTIMATE.start_main_~j~0#1| 0))' at error location [2023-11-12 00:56:39,198 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-12 00:56:39,198 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-12 00:56:39,199 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 9 [2023-11-12 00:56:39,199 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1384690239] [2023-11-12 00:56:39,199 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-12 00:56:39,200 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2023-11-12 00:56:39,200 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:56:39,201 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2023-11-12 00:56:39,201 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=76, Invalid=106, Unknown=0, NotChecked=0, Total=182 [2023-11-12 00:56:39,201 INFO L87 Difference]: Start difference. First operand 14 states and 16 transitions. Second operand has 9 states, 9 states have (on average 1.6666666666666667) internal successors, (15), 9 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 00:56:39,278 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:56:39,279 INFO L93 Difference]: Finished difference Result 54 states and 63 transitions. [2023-11-12 00:56:39,279 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2023-11-12 00:56:39,279 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 1.6666666666666667) internal successors, (15), 9 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) Word has length 12 [2023-11-12 00:56:39,280 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:56:39,280 INFO L225 Difference]: With dead ends: 54 [2023-11-12 00:56:39,281 INFO L226 Difference]: Without dead ends: 46 [2023-11-12 00:56:39,281 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 64 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=76, Invalid=106, Unknown=0, NotChecked=0, Total=182 [2023-11-12 00:56:39,282 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 44 mSDsluCounter, 15 mSDsCounter, 0 mSdLazyCounter, 31 mSolverCounterSat, 25 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 44 SdHoareTripleChecker+Valid, 18 SdHoareTripleChecker+Invalid, 56 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 25 IncrementalHoareTripleChecker+Valid, 31 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-12 00:56:39,283 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [44 Valid, 18 Invalid, 56 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [25 Valid, 31 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-12 00:56:39,284 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2023-11-12 00:56:39,288 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 20. [2023-11-12 00:56:39,288 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 19 states have (on average 1.1578947368421053) internal successors, (22), 19 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:56:39,289 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 22 transitions. [2023-11-12 00:56:39,289 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 22 transitions. Word has length 12 [2023-11-12 00:56:39,289 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:56:39,289 INFO L495 AbstractCegarLoop]: Abstraction has 20 states and 22 transitions. [2023-11-12 00:56:39,290 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 1.6666666666666667) internal successors, (15), 9 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 00:56:39,290 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 22 transitions. [2023-11-12 00:56:39,291 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2023-11-12 00:56:39,291 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:56:39,291 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 1, 1, 1, 1, 1, 1] [2023-11-12 00:56:39,301 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c814484-a2e4-4e57-9a58-6042933563da/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-11-12 00:56:39,496 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c814484-a2e4-4e57-9a58-6042933563da/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable3 [2023-11-12 00:56:39,497 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 00:56:39,497 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:56:39,497 INFO L85 PathProgramCache]: Analyzing trace with hash 376721006, now seen corresponding path program 3 times [2023-11-12 00:56:39,497 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:56:39,497 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1797081024] [2023-11-12 00:56:39,497 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:56:39,498 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:56:39,526 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:56:39,669 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2023-11-12 00:56:39,670 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:56:39,670 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1797081024] [2023-11-12 00:56:39,670 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1797081024] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:56:39,670 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [344188934] [2023-11-12 00:56:39,670 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-11-12 00:56:39,670 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:56:39,671 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c814484-a2e4-4e57-9a58-6042933563da/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:56:39,672 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c814484-a2e4-4e57-9a58-6042933563da/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:56:39,702 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c814484-a2e4-4e57-9a58-6042933563da/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-11-12 00:56:39,770 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-11-12 00:56:39,770 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-12 00:56:39,771 INFO L262 TraceCheckSpWp]: Trace formula consists of 171 conjuncts, 8 conjunts are in the unsatisfiable core [2023-11-12 00:56:39,773 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:56:39,827 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2023-11-12 00:56:39,828 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 00:56:39,940 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2023-11-12 00:56:39,940 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [344188934] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-12 00:56:39,941 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [412926842] [2023-11-12 00:56:39,943 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2023-11-12 00:56:39,943 INFO L166 IcfgInterpreter]: Building call graph [2023-11-12 00:56:39,944 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-12 00:56:39,944 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-12 00:56:39,944 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-12 00:56:40,182 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-12 00:56:40,390 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '555#(and (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_main_#t~mem3#1| (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) 0)) (= |ULTIMATE.start_main_~#b~0#1.offset| 0) (not (= |ULTIMATE.start_main_#t~mem4#1| |ULTIMATE.start_main_#t~mem3#1|)) (<= 2 |ULTIMATE.start_main_~#b~0#1.base|) (= |ULTIMATE.start_main_~i~0#1| 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) (= (select (select |#memory_int| |ULTIMATE.start_main_~#b~0#1.base|) 4) |ULTIMATE.start_main_#t~mem4#1|) (= |ULTIMATE.start_main_~j~0#1| 0))' at error location [2023-11-12 00:56:40,390 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-12 00:56:40,390 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-12 00:56:40,390 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8, 8] total 22 [2023-11-12 00:56:40,391 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2069645308] [2023-11-12 00:56:40,391 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-12 00:56:40,391 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2023-11-12 00:56:40,391 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:56:40,393 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2023-11-12 00:56:40,393 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=306, Invalid=396, Unknown=0, NotChecked=0, Total=702 [2023-11-12 00:56:40,394 INFO L87 Difference]: Start difference. First operand 20 states and 22 transitions. Second operand has 22 states, 22 states have (on average 1.4090909090909092) internal successors, (31), 22 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:56:40,572 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:56:40,572 INFO L93 Difference]: Finished difference Result 93 states and 112 transitions. [2023-11-12 00:56:40,572 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2023-11-12 00:56:40,573 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 1.4090909090909092) internal successors, (31), 22 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 18 [2023-11-12 00:56:40,573 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:56:40,575 INFO L225 Difference]: With dead ends: 93 [2023-11-12 00:56:40,575 INFO L226 Difference]: Without dead ends: 81 [2023-11-12 00:56:40,577 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 36 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 315 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=306, Invalid=396, Unknown=0, NotChecked=0, Total=702 [2023-11-12 00:56:40,578 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 79 mSDsluCounter, 45 mSDsCounter, 0 mSdLazyCounter, 73 mSolverCounterSat, 36 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 79 SdHoareTripleChecker+Valid, 48 SdHoareTripleChecker+Invalid, 109 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 36 IncrementalHoareTripleChecker+Valid, 73 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-12 00:56:40,578 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [79 Valid, 48 Invalid, 109 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [36 Valid, 73 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-12 00:56:40,579 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2023-11-12 00:56:40,592 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 36. [2023-11-12 00:56:40,593 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 35 states have (on average 1.0857142857142856) internal successors, (38), 35 states have internal predecessors, (38), 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 00:56:40,594 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 38 transitions. [2023-11-12 00:56:40,594 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 38 transitions. Word has length 18 [2023-11-12 00:56:40,594 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:56:40,594 INFO L495 AbstractCegarLoop]: Abstraction has 36 states and 38 transitions. [2023-11-12 00:56:40,595 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 1.4090909090909092) internal successors, (31), 22 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:56:40,595 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 38 transitions. [2023-11-12 00:56:40,596 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2023-11-12 00:56:40,596 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:56:40,596 INFO L195 NwaCegarLoop]: trace histogram [19, 9, 1, 1, 1, 1, 1, 1] [2023-11-12 00:56:40,616 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c814484-a2e4-4e57-9a58-6042933563da/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-11-12 00:56:40,812 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c814484-a2e4-4e57-9a58-6042933563da/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:56:40,812 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 00:56:40,813 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:56:40,813 INFO L85 PathProgramCache]: Analyzing trace with hash -1462949573, now seen corresponding path program 4 times [2023-11-12 00:56:40,813 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:56:40,813 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1013737656] [2023-11-12 00:56:40,813 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:56:40,813 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:56:40,885 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:56:41,234 INFO L134 CoverageAnalysis]: Checked inductivity of 235 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 190 trivial. 0 not checked. [2023-11-12 00:56:41,234 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:56:41,234 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1013737656] [2023-11-12 00:56:41,235 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1013737656] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:56:41,235 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1623564032] [2023-11-12 00:56:41,235 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-11-12 00:56:41,235 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:56:41,235 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c814484-a2e4-4e57-9a58-6042933563da/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:56:41,239 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c814484-a2e4-4e57-9a58-6042933563da/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:56:41,263 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c814484-a2e4-4e57-9a58-6042933563da/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-11-12 00:56:41,379 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:56:41,382 INFO L262 TraceCheckSpWp]: Trace formula consists of 315 conjuncts, 21 conjunts are in the unsatisfiable core [2023-11-12 00:56:41,388 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:56:41,569 INFO L134 CoverageAnalysis]: Checked inductivity of 235 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2023-11-12 00:56:41,570 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 00:56:42,083 INFO L134 CoverageAnalysis]: Checked inductivity of 235 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2023-11-12 00:56:42,083 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1623564032] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-12 00:56:42,084 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2034669082] [2023-11-12 00:56:42,086 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2023-11-12 00:56:42,086 INFO L166 IcfgInterpreter]: Building call graph [2023-11-12 00:56:42,086 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-12 00:56:42,086 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-12 00:56:42,086 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-12 00:56:42,317 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-12 00:56:42,524 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1015#(and (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_main_#t~mem3#1| (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) 0)) (= |ULTIMATE.start_main_~#b~0#1.offset| 0) (not (= |ULTIMATE.start_main_#t~mem4#1| |ULTIMATE.start_main_#t~mem3#1|)) (<= 2 |ULTIMATE.start_main_~#b~0#1.base|) (= |ULTIMATE.start_main_~i~0#1| 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) (= (select (select |#memory_int| |ULTIMATE.start_main_~#b~0#1.base|) 4) |ULTIMATE.start_main_#t~mem4#1|) (= |ULTIMATE.start_main_~j~0#1| 0))' at error location [2023-11-12 00:56:42,524 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-12 00:56:42,524 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-12 00:56:42,525 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 21, 21] total 49 [2023-11-12 00:56:42,525 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1756398697] [2023-11-12 00:56:42,525 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-12 00:56:42,526 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 49 states [2023-11-12 00:56:42,526 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:56:42,529 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2023-11-12 00:56:42,530 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1332, Invalid=1530, Unknown=0, NotChecked=0, Total=2862 [2023-11-12 00:56:42,532 INFO L87 Difference]: Start difference. First operand 36 states and 38 transitions. Second operand has 49 states, 49 states have (on average 1.2244897959183674) internal successors, (60), 49 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 00:56:42,819 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:56:42,820 INFO L93 Difference]: Finished difference Result 153 states and 188 transitions. [2023-11-12 00:56:42,820 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2023-11-12 00:56:42,820 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 49 states have (on average 1.2244897959183674) internal successors, (60), 49 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) Word has length 34 [2023-11-12 00:56:42,821 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:56:42,825 INFO L225 Difference]: With dead ends: 153 [2023-11-12 00:56:42,825 INFO L226 Difference]: Without dead ends: 138 [2023-11-12 00:56:42,827 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 112 GetRequests, 60 SyntacticMatches, 0 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1557 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=1332, Invalid=1530, Unknown=0, NotChecked=0, Total=2862 [2023-11-12 00:56:42,829 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 203 mSDsluCounter, 75 mSDsCounter, 0 mSdLazyCounter, 128 mSolverCounterSat, 85 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 203 SdHoareTripleChecker+Valid, 78 SdHoareTripleChecker+Invalid, 213 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 85 IncrementalHoareTripleChecker+Valid, 128 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-12 00:56:42,830 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [203 Valid, 78 Invalid, 213 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [85 Valid, 128 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-12 00:56:42,831 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 138 states. [2023-11-12 00:56:42,849 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 138 to 68. [2023-11-12 00:56:42,850 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 68 states, 67 states have (on average 1.044776119402985) internal successors, (70), 67 states have internal predecessors, (70), 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 00:56:42,854 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 70 transitions. [2023-11-12 00:56:42,854 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 70 transitions. Word has length 34 [2023-11-12 00:56:42,855 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:56:42,855 INFO L495 AbstractCegarLoop]: Abstraction has 68 states and 70 transitions. [2023-11-12 00:56:42,855 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 49 states, 49 states have (on average 1.2244897959183674) internal successors, (60), 49 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 00:56:42,855 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 70 transitions. [2023-11-12 00:56:42,859 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2023-11-12 00:56:42,859 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:56:42,860 INFO L195 NwaCegarLoop]: trace histogram [46, 14, 1, 1, 1, 1, 1, 1] [2023-11-12 00:56:42,866 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c814484-a2e4-4e57-9a58-6042933563da/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-11-12 00:56:43,065 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c814484-a2e4-4e57-9a58-6042933563da/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:56:43,066 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 00:56:43,066 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:56:43,067 INFO L85 PathProgramCache]: Analyzing trace with hash 1929764334, now seen corresponding path program 5 times [2023-11-12 00:56:43,067 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:56:43,067 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [663358400] [2023-11-12 00:56:43,067 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:56:43,067 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:56:43,182 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:56:43,838 INFO L134 CoverageAnalysis]: Checked inductivity of 1186 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 1081 trivial. 0 not checked. [2023-11-12 00:56:43,838 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:56:43,838 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [663358400] [2023-11-12 00:56:43,838 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [663358400] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:56:43,838 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1466829948] [2023-11-12 00:56:43,838 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-12 00:56:43,839 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:56:43,839 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c814484-a2e4-4e57-9a58-6042933563da/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:56:43,840 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c814484-a2e4-4e57-9a58-6042933563da/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:56:43,871 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c814484-a2e4-4e57-9a58-6042933563da/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-11-12 00:56:46,782 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2023-11-12 00:56:46,782 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-12 00:56:46,792 INFO L262 TraceCheckSpWp]: Trace formula consists of 315 conjuncts, 16 conjunts are in the unsatisfiable core [2023-11-12 00:56:46,796 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:56:46,839 INFO L134 CoverageAnalysis]: Checked inductivity of 1186 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 1081 trivial. 0 not checked. [2023-11-12 00:56:46,839 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 00:56:47,251 INFO L134 CoverageAnalysis]: Checked inductivity of 1186 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 1081 trivial. 0 not checked. [2023-11-12 00:56:47,251 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1466829948] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-12 00:56:47,252 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1971011596] [2023-11-12 00:56:47,254 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2023-11-12 00:56:47,254 INFO L166 IcfgInterpreter]: Building call graph [2023-11-12 00:56:47,255 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-12 00:56:47,255 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-12 00:56:47,255 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-12 00:56:47,517 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-12 00:56:47,709 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1815#(and (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_main_#t~mem3#1| (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) 0)) (= |ULTIMATE.start_main_~#b~0#1.offset| 0) (not (= |ULTIMATE.start_main_#t~mem4#1| |ULTIMATE.start_main_#t~mem3#1|)) (<= 2 |ULTIMATE.start_main_~#b~0#1.base|) (= |ULTIMATE.start_main_~i~0#1| 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) (= (select (select |#memory_int| |ULTIMATE.start_main_~#b~0#1.base|) 4) |ULTIMATE.start_main_#t~mem4#1|) (= |ULTIMATE.start_main_~j~0#1| 0))' at error location [2023-11-12 00:56:47,709 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-12 00:56:47,710 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-12 00:56:47,710 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 33 [2023-11-12 00:56:47,711 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [233899512] [2023-11-12 00:56:47,711 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-12 00:56:47,714 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2023-11-12 00:56:47,714 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:56:47,715 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2023-11-12 00:56:47,716 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=640, Invalid=766, Unknown=0, NotChecked=0, Total=1406 [2023-11-12 00:56:47,716 INFO L87 Difference]: Start difference. First operand 68 states and 70 transitions. Second operand has 33 states, 33 states have (on average 1.1818181818181819) internal successors, (39), 33 states have internal predecessors, (39), 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 00:56:48,058 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:56:48,058 INFO L93 Difference]: Finished difference Result 235 states and 253 transitions. [2023-11-12 00:56:48,059 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2023-11-12 00:56:48,059 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 1.1818181818181819) internal successors, (39), 33 states have internal predecessors, (39), 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 66 [2023-11-12 00:56:48,060 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:56:48,061 INFO L225 Difference]: With dead ends: 235 [2023-11-12 00:56:48,061 INFO L226 Difference]: Without dead ends: 230 [2023-11-12 00:56:48,062 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 213 GetRequests, 177 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 328 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=640, Invalid=766, Unknown=0, NotChecked=0, Total=1406 [2023-11-12 00:56:48,063 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 372 mSDsluCounter, 87 mSDsCounter, 0 mSdLazyCounter, 127 mSolverCounterSat, 187 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 372 SdHoareTripleChecker+Valid, 90 SdHoareTripleChecker+Invalid, 314 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 187 IncrementalHoareTripleChecker+Valid, 127 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-12 00:56:48,064 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [372 Valid, 90 Invalid, 314 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [187 Valid, 127 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-12 00:56:48,065 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 230 states. [2023-11-12 00:56:48,073 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 230 to 84. [2023-11-12 00:56:48,074 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 84 states, 83 states have (on average 1.036144578313253) internal successors, (86), 83 states have internal predecessors, (86), 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 00:56:48,074 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 86 transitions. [2023-11-12 00:56:48,075 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 86 transitions. Word has length 66 [2023-11-12 00:56:48,075 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:56:48,075 INFO L495 AbstractCegarLoop]: Abstraction has 84 states and 86 transitions. [2023-11-12 00:56:48,075 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 33 states have (on average 1.1818181818181819) internal successors, (39), 33 states have internal predecessors, (39), 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 00:56:48,076 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 86 transitions. [2023-11-12 00:56:48,077 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2023-11-12 00:56:48,077 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:56:48,077 INFO L195 NwaCegarLoop]: trace histogram [46, 30, 1, 1, 1, 1, 1, 1] [2023-11-12 00:56:48,092 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c814484-a2e4-4e57-9a58-6042933563da/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2023-11-12 00:56:48,285 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c814484-a2e4-4e57-9a58-6042933563da/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2023-11-12 00:56:48,286 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 00:56:48,286 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:56:48,286 INFO L85 PathProgramCache]: Analyzing trace with hash -28725778, now seen corresponding path program 6 times [2023-11-12 00:56:48,286 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:56:48,286 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [336873115] [2023-11-12 00:56:48,286 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:56:48,287 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:56:48,387 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:56:49,872 INFO L134 CoverageAnalysis]: Checked inductivity of 1546 backedges. 0 proven. 465 refuted. 0 times theorem prover too weak. 1081 trivial. 0 not checked. [2023-11-12 00:56:49,873 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:56:49,873 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [336873115] [2023-11-12 00:56:49,873 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [336873115] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:56:49,873 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [658082401] [2023-11-12 00:56:49,873 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-11-12 00:56:49,873 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:56:49,874 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c814484-a2e4-4e57-9a58-6042933563da/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:56:49,875 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c814484-a2e4-4e57-9a58-6042933563da/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:56:49,899 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c814484-a2e4-4e57-9a58-6042933563da/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-11-12 00:56:50,157 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-11-12 00:56:50,158 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-12 00:56:50,162 INFO L262 TraceCheckSpWp]: Trace formula consists of 747 conjuncts, 48 conjunts are in the unsatisfiable core [2023-11-12 00:56:50,168 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:56:50,694 INFO L134 CoverageAnalysis]: Checked inductivity of 1546 backedges. 0 proven. 1081 refuted. 0 times theorem prover too weak. 465 trivial. 0 not checked. [2023-11-12 00:56:50,694 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 00:56:53,365 INFO L134 CoverageAnalysis]: Checked inductivity of 1546 backedges. 0 proven. 1081 refuted. 0 times theorem prover too weak. 465 trivial. 0 not checked. [2023-11-12 00:56:53,366 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [658082401] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-12 00:56:53,366 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1826787494] [2023-11-12 00:56:53,368 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2023-11-12 00:56:53,368 INFO L166 IcfgInterpreter]: Building call graph [2023-11-12 00:56:53,368 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-12 00:56:53,369 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-12 00:56:53,369 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-12 00:56:53,588 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-12 00:56:53,791 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2932#(and (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_main_#t~mem3#1| (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) 0)) (= |ULTIMATE.start_main_~#b~0#1.offset| 0) (not (= |ULTIMATE.start_main_#t~mem4#1| |ULTIMATE.start_main_#t~mem3#1|)) (<= 2 |ULTIMATE.start_main_~#b~0#1.base|) (= |ULTIMATE.start_main_~i~0#1| 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) (= (select (select |#memory_int| |ULTIMATE.start_main_~#b~0#1.base|) 4) |ULTIMATE.start_main_#t~mem4#1|) (= |ULTIMATE.start_main_~j~0#1| 0))' at error location [2023-11-12 00:56:53,791 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-12 00:56:53,791 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-12 00:56:53,792 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 48, 48] total 118 [2023-11-12 00:56:53,792 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1651277891] [2023-11-12 00:56:53,792 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-12 00:56:53,793 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 118 states [2023-11-12 00:56:53,794 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:56:53,797 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 118 interpolants. [2023-11-12 00:56:53,802 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7266, Invalid=7740, Unknown=0, NotChecked=0, Total=15006 [2023-11-12 00:56:53,803 INFO L87 Difference]: Start difference. First operand 84 states and 86 transitions. Second operand has 118 states, 118 states have (on average 1.1440677966101696) internal successors, (135), 118 states have internal predecessors, (135), 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 00:56:55,311 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:56:55,311 INFO L93 Difference]: Finished difference Result 405 states and 488 transitions. [2023-11-12 00:56:55,311 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 118 states. [2023-11-12 00:56:55,312 INFO L78 Accepts]: Start accepts. Automaton has has 118 states, 118 states have (on average 1.1440677966101696) internal successors, (135), 118 states have internal predecessors, (135), 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 82 [2023-11-12 00:56:55,312 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:56:55,314 INFO L225 Difference]: With dead ends: 405 [2023-11-12 00:56:55,314 INFO L226 Difference]: Without dead ends: 369 [2023-11-12 00:56:55,320 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 277 GetRequests, 156 SyntacticMatches, 0 SemanticMatches, 121 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7851 ImplicationChecksByTransitivity, 3.6s TimeCoverageRelationStatistics Valid=7266, Invalid=7740, Unknown=0, NotChecked=0, Total=15006 [2023-11-12 00:56:55,321 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 935 mSDsluCounter, 192 mSDsCounter, 0 mSdLazyCounter, 316 mSolverCounterSat, 350 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 935 SdHoareTripleChecker+Valid, 195 SdHoareTripleChecker+Invalid, 666 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 350 IncrementalHoareTripleChecker+Valid, 316 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-11-12 00:56:55,321 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [935 Valid, 195 Invalid, 666 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [350 Valid, 316 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-11-12 00:56:55,322 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 369 states. [2023-11-12 00:56:55,336 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 369 to 164. [2023-11-12 00:56:55,336 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 164 states, 163 states have (on average 1.01840490797546) internal successors, (166), 163 states have internal predecessors, (166), 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 00:56:55,337 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 164 states to 164 states and 166 transitions. [2023-11-12 00:56:55,337 INFO L78 Accepts]: Start accepts. Automaton has 164 states and 166 transitions. Word has length 82 [2023-11-12 00:56:55,338 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:56:55,338 INFO L495 AbstractCegarLoop]: Abstraction has 164 states and 166 transitions. [2023-11-12 00:56:55,338 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 118 states, 118 states have (on average 1.1440677966101696) internal successors, (135), 118 states have internal predecessors, (135), 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 00:56:55,339 INFO L276 IsEmpty]: Start isEmpty. Operand 164 states and 166 transitions. [2023-11-12 00:56:55,341 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 163 [2023-11-12 00:56:55,341 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:56:55,341 INFO L195 NwaCegarLoop]: trace histogram [115, 41, 1, 1, 1, 1, 1, 1] [2023-11-12 00:56:55,355 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c814484-a2e4-4e57-9a58-6042933563da/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2023-11-12 00:56:55,553 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c814484-a2e4-4e57-9a58-6042933563da/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2023-11-12 00:56:55,553 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 00:56:55,553 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:56:55,554 INFO L85 PathProgramCache]: Analyzing trace with hash 1529276219, now seen corresponding path program 7 times [2023-11-12 00:56:55,554 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:56:55,554 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [397778375] [2023-11-12 00:56:55,554 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:56:55,554 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:56:55,743 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:56:58,774 INFO L134 CoverageAnalysis]: Checked inductivity of 7531 backedges. 0 proven. 861 refuted. 0 times theorem prover too weak. 6670 trivial. 0 not checked. [2023-11-12 00:56:58,775 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:56:58,775 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [397778375] [2023-11-12 00:56:58,775 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [397778375] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:56:58,775 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [580657427] [2023-11-12 00:56:58,776 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-11-12 00:56:58,776 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:56:58,776 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c814484-a2e4-4e57-9a58-6042933563da/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:56:58,788 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c814484-a2e4-4e57-9a58-6042933563da/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:56:58,811 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c814484-a2e4-4e57-9a58-6042933563da/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-11-12 00:56:59,268 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:56:59,279 INFO L262 TraceCheckSpWp]: Trace formula consists of 1467 conjuncts, 117 conjunts are in the unsatisfiable core [2023-11-12 00:56:59,290 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:57:01,004 INFO L134 CoverageAnalysis]: Checked inductivity of 7531 backedges. 0 proven. 6670 refuted. 0 times theorem prover too weak. 861 trivial. 0 not checked. [2023-11-12 00:57:01,004 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 00:57:11,312 INFO L134 CoverageAnalysis]: Checked inductivity of 7531 backedges. 0 proven. 6670 refuted. 0 times theorem prover too weak. 861 trivial. 0 not checked. [2023-11-12 00:57:11,312 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [580657427] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-12 00:57:11,312 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1781688466] [2023-11-12 00:57:11,314 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2023-11-12 00:57:11,315 INFO L166 IcfgInterpreter]: Building call graph [2023-11-12 00:57:11,315 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-12 00:57:11,315 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-12 00:57:11,315 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-12 00:57:11,529 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-12 00:57:11,750 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5117#(and (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_main_#t~mem3#1| (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) 0)) (= |ULTIMATE.start_main_~#b~0#1.offset| 0) (not (= |ULTIMATE.start_main_#t~mem4#1| |ULTIMATE.start_main_#t~mem3#1|)) (<= 2 |ULTIMATE.start_main_~#b~0#1.base|) (= |ULTIMATE.start_main_~i~0#1| 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) (= (select (select |#memory_int| |ULTIMATE.start_main_~#b~0#1.base|) 4) |ULTIMATE.start_main_#t~mem4#1|) (= |ULTIMATE.start_main_~j~0#1| 0))' at error location [2023-11-12 00:57:11,750 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-12 00:57:11,750 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-12 00:57:11,750 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 117, 117] total 254 [2023-11-12 00:57:11,751 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [655618292] [2023-11-12 00:57:11,751 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-12 00:57:11,752 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 254 states [2023-11-12 00:57:11,752 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:57:11,763 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 254 interpolants. [2023-11-12 00:57:11,772 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=32902, Invalid=33920, Unknown=0, NotChecked=0, Total=66822 [2023-11-12 00:57:11,773 INFO L87 Difference]: Start difference. First operand 164 states and 166 transitions. Second operand has 254 states, 254 states have (on average 1.1181102362204725) internal successors, (284), 254 states have internal predecessors, (284), 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 00:57:19,259 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:57:19,259 INFO L93 Difference]: Finished difference Result 698 states and 862 transitions. [2023-11-12 00:57:19,260 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 254 states. [2023-11-12 00:57:19,261 INFO L78 Accepts]: Start accepts. Automaton has has 254 states, 254 states have (on average 1.1181102362204725) internal successors, (284), 254 states have internal predecessors, (284), 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 162 [2023-11-12 00:57:19,261 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:57:19,265 INFO L225 Difference]: With dead ends: 698 [2023-11-12 00:57:19,265 INFO L226 Difference]: Without dead ends: 651 [2023-11-12 00:57:19,298 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 528 GetRequests, 271 SyntacticMatches, 0 SemanticMatches, 257 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38173 ImplicationChecksByTransitivity, 12.5s TimeCoverageRelationStatistics Valid=32902, Invalid=33920, Unknown=0, NotChecked=0, Total=66822 [2023-11-12 00:57:19,299 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 1380 mSDsluCounter, 372 mSDsCounter, 0 mSdLazyCounter, 634 mSolverCounterSat, 533 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1380 SdHoareTripleChecker+Valid, 375 SdHoareTripleChecker+Invalid, 1167 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 533 IncrementalHoareTripleChecker+Valid, 634 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2023-11-12 00:57:19,299 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1380 Valid, 375 Invalid, 1167 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [533 Valid, 634 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2023-11-12 00:57:19,300 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 651 states. [2023-11-12 00:57:19,323 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 651 to 325. [2023-11-12 00:57:19,324 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 325 states, 324 states have (on average 1.0092592592592593) internal successors, (327), 324 states have internal predecessors, (327), 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 00:57:19,325 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 325 states to 325 states and 327 transitions. [2023-11-12 00:57:19,325 INFO L78 Accepts]: Start accepts. Automaton has 325 states and 327 transitions. Word has length 162 [2023-11-12 00:57:19,326 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:57:19,326 INFO L495 AbstractCegarLoop]: Abstraction has 325 states and 327 transitions. [2023-11-12 00:57:19,327 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 254 states, 254 states have (on average 1.1181102362204725) internal successors, (284), 254 states have internal predecessors, (284), 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 00:57:19,327 INFO L276 IsEmpty]: Start isEmpty. Operand 325 states and 327 transitions. [2023-11-12 00:57:19,333 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 324 [2023-11-12 00:57:19,333 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:57:19,334 INFO L195 NwaCegarLoop]: trace histogram [251, 66, 1, 1, 1, 1, 1, 1] [2023-11-12 00:57:19,343 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c814484-a2e4-4e57-9a58-6042933563da/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2023-11-12 00:57:19,539 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c814484-a2e4-4e57-9a58-6042933563da/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2023-11-12 00:57:19,539 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 00:57:19,539 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:57:19,540 INFO L85 PathProgramCache]: Analyzing trace with hash 1291070865, now seen corresponding path program 8 times [2023-11-12 00:57:19,540 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:57:19,540 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [382735095] [2023-11-12 00:57:19,540 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:57:19,540 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:57:19,917 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat