./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/array-tiling/pr2.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 4fc63b2a Calling Ultimate with: /usr/lib/jvm/java-1.11.0-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4ee0fe1-4269-4c93-97b6-2a52674254be/bin/utaipan-verify-DbMuA5NWw2/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4ee0fe1-4269-4c93-97b6-2a52674254be/bin/utaipan-verify-DbMuA5NWw2/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4ee0fe1-4269-4c93-97b6-2a52674254be/bin/utaipan-verify-DbMuA5NWw2/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4ee0fe1-4269-4c93-97b6-2a52674254be/bin/utaipan-verify-DbMuA5NWw2/config/TaipanReach.xml -i ../../sv-benchmarks/c/array-tiling/pr2.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4ee0fe1-4269-4c93-97b6-2a52674254be/bin/utaipan-verify-DbMuA5NWw2/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4ee0fe1-4269-4c93-97b6-2a52674254be/bin/utaipan-verify-DbMuA5NWw2 --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 5922a5be589e27d89439744489152c928c7510f0140c8b0fb4d1faadee969752 --- Real Ultimate output --- This is Ultimate 0.2.5-dev-4fc63b2 [2024-11-02 11:25:58,055 INFO L188 SettingsManager]: Resetting all preferences to default values... [2024-11-02 11:25:58,161 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4ee0fe1-4269-4c93-97b6-2a52674254be/bin/utaipan-verify-DbMuA5NWw2/config/svcomp-Reach-32bit-Taipan_Default.epf [2024-11-02 11:25:58,169 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2024-11-02 11:25:58,169 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2024-11-02 11:25:58,211 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2024-11-02 11:25:58,212 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2024-11-02 11:25:58,212 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2024-11-02 11:25:58,213 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2024-11-02 11:25:58,214 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2024-11-02 11:25:58,214 INFO L153 SettingsManager]: * User list type=DISABLED [2024-11-02 11:25:58,215 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2024-11-02 11:25:58,215 INFO L153 SettingsManager]: * Explicit value domain=true [2024-11-02 11:25:58,216 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2024-11-02 11:25:58,216 INFO L153 SettingsManager]: * Octagon Domain=false [2024-11-02 11:25:58,217 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2024-11-02 11:25:58,217 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2024-11-02 11:25:58,218 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2024-11-02 11:25:58,218 INFO L153 SettingsManager]: * Interval Domain=false [2024-11-02 11:25:58,219 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2024-11-02 11:25:58,223 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2024-11-02 11:25:58,225 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2024-11-02 11:25:58,226 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2024-11-02 11:25:58,226 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2024-11-02 11:25:58,227 INFO L153 SettingsManager]: * sizeof long=4 [2024-11-02 11:25:58,227 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2024-11-02 11:25:58,227 INFO L153 SettingsManager]: * sizeof POINTER=4 [2024-11-02 11:25:58,227 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2024-11-02 11:25:58,228 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2024-11-02 11:25:58,230 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2024-11-02 11:25:58,230 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2024-11-02 11:25:58,230 INFO L153 SettingsManager]: * Allow undefined functions=false [2024-11-02 11:25:58,231 INFO L153 SettingsManager]: * sizeof long double=12 [2024-11-02 11:25:58,232 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2024-11-02 11:25:58,232 INFO L153 SettingsManager]: * Use constant arrays=true [2024-11-02 11:25:58,233 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2024-11-02 11:25:58,233 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2024-11-02 11:25:58,233 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2024-11-02 11:25:58,234 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2024-11-02 11:25:58,234 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2024-11-02 11:25:58,234 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2024-11-02 11:25:58,235 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2024-11-02 11:25:58,235 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2024-11-02 11:25:58,235 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2024-11-02 11:25:58,236 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2024-11-02 11:25:58,236 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2024-11-02 11:25:58,237 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2024-11-02 11:25:58,237 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_a4ee0fe1-4269-4c93-97b6-2a52674254be/bin/utaipan-verify-DbMuA5NWw2/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4ee0fe1-4269-4c93-97b6-2a52674254be/bin/utaipan-verify-DbMuA5NWw2 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 5922a5be589e27d89439744489152c928c7510f0140c8b0fb4d1faadee969752 [2024-11-02 11:25:58,556 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2024-11-02 11:25:58,589 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2024-11-02 11:25:58,592 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2024-11-02 11:25:58,594 INFO L270 PluginConnector]: Initializing CDTParser... [2024-11-02 11:25:58,595 INFO L274 PluginConnector]: CDTParser initialized [2024-11-02 11:25:58,596 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4ee0fe1-4269-4c93-97b6-2a52674254be/bin/utaipan-verify-DbMuA5NWw2/../../sv-benchmarks/c/array-tiling/pr2.c Unable to find full path for "g++" [2024-11-02 11:26:00,787 INFO L533 CDTParser]: Created temporary CDT project at NULL [2024-11-02 11:26:00,992 INFO L384 CDTParser]: Found 1 translation units. [2024-11-02 11:26:00,992 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4ee0fe1-4269-4c93-97b6-2a52674254be/sv-benchmarks/c/array-tiling/pr2.c [2024-11-02 11:26:01,004 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4ee0fe1-4269-4c93-97b6-2a52674254be/bin/utaipan-verify-DbMuA5NWw2/data/5e0f271c4/89cbf493f03547d8bb6384fb7f996f88/FLAGd130f6651 [2024-11-02 11:26:01,021 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4ee0fe1-4269-4c93-97b6-2a52674254be/bin/utaipan-verify-DbMuA5NWw2/data/5e0f271c4/89cbf493f03547d8bb6384fb7f996f88 [2024-11-02 11:26:01,024 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2024-11-02 11:26:01,025 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2024-11-02 11:26:01,026 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2024-11-02 11:26:01,026 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2024-11-02 11:26:01,033 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2024-11-02 11:26:01,033 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.11 11:26:01" (1/1) ... [2024-11-02 11:26:01,035 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4615569d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 11:26:01, skipping insertion in model container [2024-11-02 11:26:01,035 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.11 11:26:01" (1/1) ... [2024-11-02 11:26:01,074 INFO L175 MainTranslator]: Built tables and reachable declarations [2024-11-02 11:26:01,273 WARN L251 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_a4ee0fe1-4269-4c93-97b6-2a52674254be/sv-benchmarks/c/array-tiling/pr2.c[394,407] [2024-11-02 11:26:01,297 INFO L210 PostProcessor]: Analyzing one entry point: main [2024-11-02 11:26:01,307 INFO L200 MainTranslator]: Completed pre-run [2024-11-02 11:26:01,318 WARN L251 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_a4ee0fe1-4269-4c93-97b6-2a52674254be/sv-benchmarks/c/array-tiling/pr2.c[394,407] [2024-11-02 11:26:01,333 INFO L210 PostProcessor]: Analyzing one entry point: main [2024-11-02 11:26:01,356 INFO L204 MainTranslator]: Completed translation [2024-11-02 11:26:01,356 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 11:26:01 WrapperNode [2024-11-02 11:26:01,357 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2024-11-02 11:26:01,358 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2024-11-02 11:26:01,358 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2024-11-02 11:26:01,358 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2024-11-02 11:26:01,368 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 11:26:01" (1/1) ... [2024-11-02 11:26:01,377 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 11:26:01" (1/1) ... [2024-11-02 11:26:01,396 INFO L138 Inliner]: procedures = 15, calls = 24, calls flagged for inlining = 4, calls inlined = 4, statements flattened = 76 [2024-11-02 11:26:01,396 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2024-11-02 11:26:01,397 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2024-11-02 11:26:01,397 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2024-11-02 11:26:01,397 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2024-11-02 11:26:01,405 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 11:26:01" (1/1) ... [2024-11-02 11:26:01,405 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 11:26:01" (1/1) ... [2024-11-02 11:26:01,407 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 11:26:01" (1/1) ... [2024-11-02 11:26:01,408 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 11:26:01" (1/1) ... [2024-11-02 11:26:01,414 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 11:26:01" (1/1) ... [2024-11-02 11:26:01,421 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 11:26:01" (1/1) ... [2024-11-02 11:26:01,423 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 11:26:01" (1/1) ... [2024-11-02 11:26:01,424 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 11:26:01" (1/1) ... [2024-11-02 11:26:01,426 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2024-11-02 11:26:01,427 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2024-11-02 11:26:01,427 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2024-11-02 11:26:01,427 INFO L274 PluginConnector]: RCFGBuilder initialized [2024-11-02 11:26:01,428 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 11:26:01" (1/1) ... [2024-11-02 11:26:01,435 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2024-11-02 11:26:01,448 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4ee0fe1-4269-4c93-97b6-2a52674254be/bin/utaipan-verify-DbMuA5NWw2/z3 [2024-11-02 11:26:01,459 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4ee0fe1-4269-4c93-97b6-2a52674254be/bin/utaipan-verify-DbMuA5NWw2/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2024-11-02 11:26:01,462 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4ee0fe1-4269-4c93-97b6-2a52674254be/bin/utaipan-verify-DbMuA5NWw2/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2024-11-02 11:26:01,496 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2024-11-02 11:26:01,496 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2024-11-02 11:26:01,496 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2024-11-02 11:26:01,499 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2024-11-02 11:26:01,499 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2024-11-02 11:26:01,499 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2024-11-02 11:26:01,499 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2024-11-02 11:26:01,499 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2024-11-02 11:26:01,591 INFO L238 CfgBuilder]: Building ICFG [2024-11-02 11:26:01,594 INFO L264 CfgBuilder]: Building CFG for each procedure with an implementation [2024-11-02 11:26:01,841 INFO L? ?]: Removed 12 outVars from TransFormulas that were not future-live. [2024-11-02 11:26:01,841 INFO L287 CfgBuilder]: Performing block encoding [2024-11-02 11:26:01,960 INFO L311 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2024-11-02 11:26:01,960 INFO L316 CfgBuilder]: Removed 2 assume(true) statements. [2024-11-02 11:26:01,961 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.11 11:26:01 BoogieIcfgContainer [2024-11-02 11:26:01,961 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2024-11-02 11:26:01,965 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2024-11-02 11:26:01,965 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2024-11-02 11:26:01,968 INFO L274 PluginConnector]: TraceAbstraction initialized [2024-11-02 11:26:01,969 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.11 11:26:01" (1/3) ... [2024-11-02 11:26:01,970 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@458a7507 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.11 11:26:01, skipping insertion in model container [2024-11-02 11:26:01,970 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 11:26:01" (2/3) ... [2024-11-02 11:26:01,970 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@458a7507 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.11 11:26:01, skipping insertion in model container [2024-11-02 11:26:01,971 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.11 11:26:01" (3/3) ... [2024-11-02 11:26:01,972 INFO L112 eAbstractionObserver]: Analyzing ICFG pr2.c [2024-11-02 11:26:01,992 INFO L214 ceAbstractionStarter]: Automizer settings: Hoare:LoopHeads NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2024-11-02 11:26:01,993 INFO L154 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2024-11-02 11:26:02,083 INFO L332 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2024-11-02 11:26:02,094 INFO L333 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, 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;@1ae24aa5, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2024-11-02 11:26:02,095 INFO L334 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2024-11-02 11:26:02,100 INFO L276 IsEmpty]: Start isEmpty. Operand has 12 states, 10 states have (on average 1.6) internal successors, (16), 11 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) [2024-11-02 11:26:02,123 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2024-11-02 11:26:02,123 INFO L207 NwaCegarLoop]: Found error trace [2024-11-02 11:26:02,124 INFO L215 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2024-11-02 11:26:02,124 INFO L396 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-02 11:26:02,132 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-02 11:26:02,133 INFO L85 PathProgramCache]: Analyzing trace with hash 1729011113, now seen corresponding path program 1 times [2024-11-02 11:26:02,144 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-02 11:26:02,144 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1137588831] [2024-11-02 11:26:02,145 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-02 11:26:02,145 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-02 11:26:02,266 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-02 11:26:02,653 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-02 11:26:02,653 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-02 11:26:02,654 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1137588831] [2024-11-02 11:26:02,655 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1137588831] provided 1 perfect and 0 imperfect interpolant sequences [2024-11-02 11:26:02,655 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2024-11-02 11:26:02,655 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2024-11-02 11:26:02,657 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [882687481] [2024-11-02 11:26:02,658 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2024-11-02 11:26:02,662 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2024-11-02 11:26:02,663 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-02 11:26:02,685 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2024-11-02 11:26:02,685 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2024-11-02 11:26:02,687 INFO L87 Difference]: Start difference. First operand has 12 states, 10 states have (on average 1.6) internal successors, (16), 11 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) Second operand has 4 states, 4 states have (on average 1.75) internal successors, (7), 4 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) [2024-11-02 11:26:02,754 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-02 11:26:02,754 INFO L93 Difference]: Finished difference Result 24 states and 29 transitions. [2024-11-02 11:26:02,756 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2024-11-02 11:26:02,757 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 1.75) internal successors, (7), 4 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 [2024-11-02 11:26:02,758 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-02 11:26:02,766 INFO L225 Difference]: With dead ends: 24 [2024-11-02 11:26:02,766 INFO L226 Difference]: Without dead ends: 10 [2024-11-02 11:26:02,769 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2024-11-02 11:26:02,773 INFO L432 NwaCegarLoop]: 7 mSDtfsCounter, 12 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 22 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 22 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 22 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2024-11-02 11:26:02,774 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [12 Valid, 13 Invalid, 22 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 22 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2024-11-02 11:26:02,791 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10 states. [2024-11-02 11:26:02,805 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10 to 10. [2024-11-02 11:26:02,810 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 10 states, 9 states have (on average 1.2222222222222223) internal successors, (11), 9 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) [2024-11-02 11:26:02,811 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10 states to 10 states and 11 transitions. [2024-11-02 11:26:02,813 INFO L78 Accepts]: Start accepts. Automaton has 10 states and 11 transitions. Word has length 7 [2024-11-02 11:26:02,814 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-02 11:26:02,814 INFO L471 AbstractCegarLoop]: Abstraction has 10 states and 11 transitions. [2024-11-02 11:26:02,814 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 1.75) internal successors, (7), 4 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) [2024-11-02 11:26:02,815 INFO L276 IsEmpty]: Start isEmpty. Operand 10 states and 11 transitions. [2024-11-02 11:26:02,815 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2024-11-02 11:26:02,815 INFO L207 NwaCegarLoop]: Found error trace [2024-11-02 11:26:02,815 INFO L215 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2024-11-02 11:26:02,816 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2024-11-02 11:26:02,816 INFO L396 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-02 11:26:02,817 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-02 11:26:02,817 INFO L85 PathProgramCache]: Analyzing trace with hash 2067009799, now seen corresponding path program 1 times [2024-11-02 11:26:02,817 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-02 11:26:02,818 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2004843163] [2024-11-02 11:26:02,818 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-02 11:26:02,818 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-02 11:26:02,924 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-02 11:26:03,875 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-02 11:26:03,876 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-02 11:26:03,877 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2004843163] [2024-11-02 11:26:03,877 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2004843163] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-02 11:26:03,877 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2033617556] [2024-11-02 11:26:03,877 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-02 11:26:03,878 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-02 11:26:03,878 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4ee0fe1-4269-4c93-97b6-2a52674254be/bin/utaipan-verify-DbMuA5NWw2/z3 [2024-11-02 11:26:03,880 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4ee0fe1-4269-4c93-97b6-2a52674254be/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-02 11:26:03,882 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4ee0fe1-4269-4c93-97b6-2a52674254be/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2024-11-02 11:26:03,971 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-02 11:26:03,977 INFO L255 TraceCheckSpWp]: Trace formula consists of 85 conjuncts, 19 conjuncts are in the unsatisfiable core [2024-11-02 11:26:03,986 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-02 11:26:04,165 INFO L190 IndexEqualityManager]: detected not equals via solver [2024-11-02 11:26:04,176 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 33 treesize of output 40 [2024-11-02 11:26:04,298 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 45 treesize of output 50 [2024-11-02 11:26:04,310 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 40 treesize of output 48 [2024-11-02 11:26:04,326 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 22 [2024-11-02 11:26:04,386 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2024-11-02 11:26:04,415 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 27 treesize of output 15 [2024-11-02 11:26:04,422 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2024-11-02 11:26:04,616 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 77 treesize of output 53 [2024-11-02 11:26:04,661 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-02 11:26:04,662 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-02 11:26:04,838 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2024-11-02 11:26:04,838 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 45 treesize of output 55 [2024-11-02 11:26:04,990 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 70 treesize of output 57 [2024-11-02 11:26:05,006 INFO L349 Elim1Store]: treesize reduction 5, result has 37.5 percent of original size [2024-11-02 11:26:05,007 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 57 treesize of output 51 [2024-11-02 11:26:05,019 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 3 [2024-11-02 11:26:05,042 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-02 11:26:05,043 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2033617556] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-02 11:26:05,043 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1820546834] [2024-11-02 11:26:05,073 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2024-11-02 11:26:05,073 INFO L166 IcfgInterpreter]: Building call graph [2024-11-02 11:26:05,077 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-02 11:26:05,084 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-02 11:26:05,085 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-02 11:26:05,633 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-02 11:26:06,202 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '119#(and (= |ULTIMATE.start_main_~i~0#1| 0) (<= 1 ~CELLCOUNT~0))' at error location [2024-11-02 11:26:06,202 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-02 11:26:06,202 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-02 11:26:06,203 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 6] total 15 [2024-11-02 11:26:06,204 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [803280097] [2024-11-02 11:26:06,204 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-02 11:26:06,205 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2024-11-02 11:26:06,205 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-02 11:26:06,206 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2024-11-02 11:26:06,207 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=319, Unknown=0, NotChecked=0, Total=380 [2024-11-02 11:26:06,207 INFO L87 Difference]: Start difference. First operand 10 states and 11 transitions. Second operand has 15 states, 15 states have (on average 1.2666666666666666) internal successors, (19), 15 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-02 11:26:06,523 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-02 11:26:06,523 INFO L93 Difference]: Finished difference Result 20 states and 21 transitions. [2024-11-02 11:26:06,525 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2024-11-02 11:26:06,526 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.2666666666666666) internal successors, (19), 15 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2024-11-02 11:26:06,526 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-02 11:26:06,526 INFO L225 Difference]: With dead ends: 20 [2024-11-02 11:26:06,527 INFO L226 Difference]: Without dead ends: 18 [2024-11-02 11:26:06,527 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 10 SyntacticMatches, 1 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 118 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=104, Invalid=448, Unknown=0, NotChecked=0, Total=552 [2024-11-02 11:26:06,528 INFO L432 NwaCegarLoop]: 4 mSDtfsCounter, 67 mSDsluCounter, 11 mSDsCounter, 0 mSdLazyCounter, 65 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 67 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 69 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 65 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2024-11-02 11:26:06,529 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [67 Valid, 15 Invalid, 69 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 65 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2024-11-02 11:26:06,531 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2024-11-02 11:26:06,538 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 12. [2024-11-02 11:26:06,538 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 12 states, 11 states have (on average 1.1818181818181819) internal successors, (13), 11 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) [2024-11-02 11:26:06,539 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 13 transitions. [2024-11-02 11:26:06,539 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 13 transitions. Word has length 8 [2024-11-02 11:26:06,539 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-02 11:26:06,540 INFO L471 AbstractCegarLoop]: Abstraction has 12 states and 13 transitions. [2024-11-02 11:26:06,540 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 1.2666666666666666) internal successors, (19), 15 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-02 11:26:06,542 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 13 transitions. [2024-11-02 11:26:06,542 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2024-11-02 11:26:06,542 INFO L207 NwaCegarLoop]: Found error trace [2024-11-02 11:26:06,542 INFO L215 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-02 11:26:06,566 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4ee0fe1-4269-4c93-97b6-2a52674254be/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2024-11-02 11:26:06,743 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4ee0fe1-4269-4c93-97b6-2a52674254be/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-02 11:26:06,744 INFO L396 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-02 11:26:06,744 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-02 11:26:06,744 INFO L85 PathProgramCache]: Analyzing trace with hash 1348076108, now seen corresponding path program 1 times [2024-11-02 11:26:06,744 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-02 11:26:06,745 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [142259995] [2024-11-02 11:26:06,745 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-02 11:26:06,745 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-02 11:26:06,783 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-02 11:26:07,331 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-02 11:26:07,332 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-02 11:26:07,332 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [142259995] [2024-11-02 11:26:07,332 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [142259995] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-02 11:26:07,333 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [121685868] [2024-11-02 11:26:07,333 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-02 11:26:07,333 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-02 11:26:07,333 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4ee0fe1-4269-4c93-97b6-2a52674254be/bin/utaipan-verify-DbMuA5NWw2/z3 [2024-11-02 11:26:07,335 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4ee0fe1-4269-4c93-97b6-2a52674254be/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-02 11:26:07,339 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4ee0fe1-4269-4c93-97b6-2a52674254be/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2024-11-02 11:26:07,414 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-02 11:26:07,419 INFO L255 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 18 conjuncts are in the unsatisfiable core [2024-11-02 11:26:07,422 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-02 11:26:07,471 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 33 treesize of output 40 [2024-11-02 11:26:07,512 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 5 [2024-11-02 11:26:07,675 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 67 treesize of output 47 [2024-11-02 11:26:07,709 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-02 11:26:07,710 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-02 11:26:07,869 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2024-11-02 11:26:07,870 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 45 treesize of output 55 [2024-11-02 11:26:07,942 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 50 treesize of output 34 [2024-11-02 11:26:07,957 INFO L349 Elim1Store]: treesize reduction 5, result has 37.5 percent of original size [2024-11-02 11:26:07,959 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 24 treesize of output 12 [2024-11-02 11:26:07,978 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 4 [2024-11-02 11:26:07,995 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-02 11:26:07,996 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [121685868] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-02 11:26:07,996 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1265069374] [2024-11-02 11:26:07,999 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2024-11-02 11:26:07,999 INFO L166 IcfgInterpreter]: Building call graph [2024-11-02 11:26:07,999 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-02 11:26:08,000 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-02 11:26:08,000 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-02 11:26:08,763 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-02 11:26:09,207 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '251#(and (= |ULTIMATE.start_main_~CCCELVOL1~0#1| 1) (<= 1 ~CELLCOUNT~0) (= |ULTIMATE.start_main_~#volArray~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start_main_~CCCELVOL2~0#1| 3))' at error location [2024-11-02 11:26:09,207 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-02 11:26:09,207 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-02 11:26:09,207 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 7] total 18 [2024-11-02 11:26:09,208 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1633565580] [2024-11-02 11:26:09,208 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-02 11:26:09,208 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2024-11-02 11:26:09,209 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-02 11:26:09,210 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2024-11-02 11:26:09,212 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=414, Unknown=0, NotChecked=0, Total=506 [2024-11-02 11:26:09,212 INFO L87 Difference]: Start difference. First operand 12 states and 13 transitions. Second operand has 18 states, 18 states have (on average 1.5555555555555556) internal successors, (28), 18 states have internal predecessors, (28), 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) [2024-11-02 11:26:09,467 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-02 11:26:09,467 INFO L93 Difference]: Finished difference Result 18 states and 19 transitions. [2024-11-02 11:26:09,468 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2024-11-02 11:26:09,468 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 1.5555555555555556) internal successors, (28), 18 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2024-11-02 11:26:09,469 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-02 11:26:09,469 INFO L225 Difference]: With dead ends: 18 [2024-11-02 11:26:09,469 INFO L226 Difference]: Without dead ends: 16 [2024-11-02 11:26:09,470 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 17 SyntacticMatches, 1 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 210 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=141, Invalid=561, Unknown=0, NotChecked=0, Total=702 [2024-11-02 11:26:09,471 INFO L432 NwaCegarLoop]: 4 mSDtfsCounter, 45 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 73 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 45 SdHoareTripleChecker+Valid, 21 SdHoareTripleChecker+Invalid, 76 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 73 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2024-11-02 11:26:09,471 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [45 Valid, 21 Invalid, 76 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 73 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2024-11-02 11:26:09,472 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2024-11-02 11:26:09,475 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 15. [2024-11-02 11:26:09,476 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 14 states have (on average 1.1428571428571428) internal successors, (16), 14 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-02 11:26:09,476 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 16 transitions. [2024-11-02 11:26:09,476 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 16 transitions. Word has length 11 [2024-11-02 11:26:09,477 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-02 11:26:09,477 INFO L471 AbstractCegarLoop]: Abstraction has 15 states and 16 transitions. [2024-11-02 11:26:09,477 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 1.5555555555555556) internal successors, (28), 18 states have internal predecessors, (28), 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) [2024-11-02 11:26:09,477 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 16 transitions. [2024-11-02 11:26:09,477 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2024-11-02 11:26:09,478 INFO L207 NwaCegarLoop]: Found error trace [2024-11-02 11:26:09,478 INFO L215 NwaCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2024-11-02 11:26:09,498 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4ee0fe1-4269-4c93-97b6-2a52674254be/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2024-11-02 11:26:09,678 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4ee0fe1-4269-4c93-97b6-2a52674254be/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-02 11:26:09,680 INFO L396 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-02 11:26:09,680 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-02 11:26:09,681 INFO L85 PathProgramCache]: Analyzing trace with hash -1698574617, now seen corresponding path program 2 times [2024-11-02 11:26:09,681 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-02 11:26:09,681 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1973539259] [2024-11-02 11:26:09,681 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-02 11:26:09,681 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-02 11:26:09,699 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-02 11:26:09,954 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 3 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-02 11:26:09,954 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-02 11:26:09,954 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1973539259] [2024-11-02 11:26:09,955 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1973539259] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-02 11:26:09,955 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1518973544] [2024-11-02 11:26:09,955 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2024-11-02 11:26:09,955 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-02 11:26:09,955 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4ee0fe1-4269-4c93-97b6-2a52674254be/bin/utaipan-verify-DbMuA5NWw2/z3 [2024-11-02 11:26:09,958 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4ee0fe1-4269-4c93-97b6-2a52674254be/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-02 11:26:09,959 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4ee0fe1-4269-4c93-97b6-2a52674254be/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2024-11-02 11:26:10,037 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2024-11-02 11:26:10,037 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-02 11:26:10,039 INFO L255 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 8 conjuncts are in the unsatisfiable core [2024-11-02 11:26:10,040 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-02 11:26:10,212 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 7 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-02 11:26:10,212 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-02 11:26:10,351 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 7 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-02 11:26:10,351 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1518973544] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-02 11:26:10,351 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2121708292] [2024-11-02 11:26:10,353 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2024-11-02 11:26:10,354 INFO L166 IcfgInterpreter]: Building call graph [2024-11-02 11:26:10,354 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-02 11:26:10,354 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-02 11:26:10,354 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-02 11:26:10,869 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-02 11:26:11,267 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '402#(and (<= 1 ~CELLCOUNT~0) (<= 0 |ULTIMATE.start_main_~i~0#1|))' at error location [2024-11-02 11:26:11,268 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-02 11:26:11,268 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-02 11:26:11,268 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7, 7] total 17 [2024-11-02 11:26:11,268 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [483248946] [2024-11-02 11:26:11,268 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-02 11:26:11,269 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2024-11-02 11:26:11,269 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-02 11:26:11,269 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2024-11-02 11:26:11,270 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=367, Unknown=0, NotChecked=0, Total=462 [2024-11-02 11:26:11,270 INFO L87 Difference]: Start difference. First operand 15 states and 16 transitions. Second operand has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-02 11:26:11,496 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-02 11:26:11,496 INFO L93 Difference]: Finished difference Result 29 states and 31 transitions. [2024-11-02 11:26:11,497 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2024-11-02 11:26:11,498 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 14 [2024-11-02 11:26:11,498 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-02 11:26:11,499 INFO L225 Difference]: With dead ends: 29 [2024-11-02 11:26:11,499 INFO L226 Difference]: Without dead ends: 17 [2024-11-02 11:26:11,499 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 198 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=177, Invalid=635, Unknown=0, NotChecked=0, Total=812 [2024-11-02 11:26:11,500 INFO L432 NwaCegarLoop]: 5 mSDtfsCounter, 28 mSDsluCounter, 23 mSDsCounter, 0 mSdLazyCounter, 59 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 28 SdHoareTripleChecker+Valid, 28 SdHoareTripleChecker+Invalid, 64 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 59 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2024-11-02 11:26:11,501 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [28 Valid, 28 Invalid, 64 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 59 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2024-11-02 11:26:11,502 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2024-11-02 11:26:11,506 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 16. [2024-11-02 11:26:11,507 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 15 states have (on average 1.1333333333333333) internal successors, (17), 15 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-02 11:26:11,509 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 17 transitions. [2024-11-02 11:26:11,509 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 17 transitions. Word has length 14 [2024-11-02 11:26:11,509 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-02 11:26:11,509 INFO L471 AbstractCegarLoop]: Abstraction has 16 states and 17 transitions. [2024-11-02 11:26:11,510 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-02 11:26:11,510 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 17 transitions. [2024-11-02 11:26:11,510 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2024-11-02 11:26:11,510 INFO L207 NwaCegarLoop]: Found error trace [2024-11-02 11:26:11,510 INFO L215 NwaCegarLoop]: trace histogram [3, 2, 2, 2, 1, 1, 1, 1, 1, 1] [2024-11-02 11:26:11,531 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4ee0fe1-4269-4c93-97b6-2a52674254be/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2024-11-02 11:26:11,713 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4ee0fe1-4269-4c93-97b6-2a52674254be/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-02 11:26:11,713 INFO L396 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-02 11:26:11,714 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-02 11:26:11,714 INFO L85 PathProgramCache]: Analyzing trace with hash -825002551, now seen corresponding path program 3 times [2024-11-02 11:26:11,714 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-02 11:26:11,714 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1690202386] [2024-11-02 11:26:11,714 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-02 11:26:11,714 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-02 11:26:11,772 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-02 11:26:12,577 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-02 11:26:12,577 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-02 11:26:12,577 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1690202386] [2024-11-02 11:26:12,577 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1690202386] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-02 11:26:12,577 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [796753839] [2024-11-02 11:26:12,577 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2024-11-02 11:26:12,578 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-02 11:26:12,578 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4ee0fe1-4269-4c93-97b6-2a52674254be/bin/utaipan-verify-DbMuA5NWw2/z3 [2024-11-02 11:26:12,579 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4ee0fe1-4269-4c93-97b6-2a52674254be/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-02 11:26:12,580 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4ee0fe1-4269-4c93-97b6-2a52674254be/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2024-11-02 11:26:12,672 INFO L227 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2024-11-02 11:26:12,672 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-02 11:26:12,673 INFO L255 TraceCheckSpWp]: Trace formula consists of 68 conjuncts, 21 conjuncts are in the unsatisfiable core [2024-11-02 11:26:12,677 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-02 11:26:12,736 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 37 treesize of output 44 [2024-11-02 11:26:12,792 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 30 [2024-11-02 11:26:12,807 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 48 treesize of output 56 [2024-11-02 11:26:12,817 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 28 [2024-11-02 11:26:12,836 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 13 [2024-11-02 11:26:12,856 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 5 [2024-11-02 11:26:13,125 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 77 treesize of output 47 [2024-11-02 11:26:13,163 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-02 11:26:13,164 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-02 11:26:13,464 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2024-11-02 11:26:13,464 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 45 treesize of output 55 [2024-11-02 11:26:13,550 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 53 treesize of output 38 [2024-11-02 11:26:13,565 INFO L349 Elim1Store]: treesize reduction 5, result has 37.5 percent of original size [2024-11-02 11:26:13,566 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 38 treesize of output 26 [2024-11-02 11:26:13,576 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 4 [2024-11-02 11:26:13,581 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-02 11:26:13,581 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [796753839] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-02 11:26:13,581 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2260177] [2024-11-02 11:26:13,583 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2024-11-02 11:26:13,584 INFO L166 IcfgInterpreter]: Building call graph [2024-11-02 11:26:13,584 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-02 11:26:13,584 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-02 11:26:13,585 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-02 11:26:14,047 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-02 11:26:14,581 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '586#(and (<= 1 ~CELLCOUNT~0) (<= 0 |ULTIMATE.start_main_~i~0#1|))' at error location [2024-11-02 11:26:14,582 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-02 11:26:14,582 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-02 11:26:14,582 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9, 9] total 20 [2024-11-02 11:26:14,582 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1519302321] [2024-11-02 11:26:14,582 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-02 11:26:14,583 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2024-11-02 11:26:14,583 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-02 11:26:14,584 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2024-11-02 11:26:14,585 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=519, Unknown=0, NotChecked=0, Total=600 [2024-11-02 11:26:14,585 INFO L87 Difference]: Start difference. First operand 16 states and 17 transitions. Second operand has 20 states, 20 states have (on average 1.8) internal successors, (36), 20 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-02 11:26:15,055 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-02 11:26:15,055 INFO L93 Difference]: Finished difference Result 23 states and 25 transitions. [2024-11-02 11:26:15,055 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2024-11-02 11:26:15,056 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 1.8) internal successors, (36), 20 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 15 [2024-11-02 11:26:15,056 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-02 11:26:15,056 INFO L225 Difference]: With dead ends: 23 [2024-11-02 11:26:15,057 INFO L226 Difference]: Without dead ends: 21 [2024-11-02 11:26:15,057 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 29 SyntacticMatches, 1 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 206 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=144, Invalid=786, Unknown=0, NotChecked=0, Total=930 [2024-11-02 11:26:15,058 INFO L432 NwaCegarLoop]: 5 mSDtfsCounter, 33 mSDsluCounter, 31 mSDsCounter, 0 mSdLazyCounter, 125 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 33 SdHoareTripleChecker+Valid, 36 SdHoareTripleChecker+Invalid, 130 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 125 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2024-11-02 11:26:15,059 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [33 Valid, 36 Invalid, 130 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 125 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2024-11-02 11:26:15,059 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2024-11-02 11:26:15,066 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 19. [2024-11-02 11:26:15,066 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 18 states have (on average 1.1111111111111112) internal successors, (20), 18 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-02 11:26:15,067 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 20 transitions. [2024-11-02 11:26:15,067 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 20 transitions. Word has length 15 [2024-11-02 11:26:15,067 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-02 11:26:15,067 INFO L471 AbstractCegarLoop]: Abstraction has 19 states and 20 transitions. [2024-11-02 11:26:15,067 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 1.8) internal successors, (36), 20 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-02 11:26:15,067 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 20 transitions. [2024-11-02 11:26:15,068 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2024-11-02 11:26:15,068 INFO L207 NwaCegarLoop]: Found error trace [2024-11-02 11:26:15,069 INFO L215 NwaCegarLoop]: trace histogram [4, 3, 3, 2, 1, 1, 1, 1, 1, 1] [2024-11-02 11:26:15,084 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4ee0fe1-4269-4c93-97b6-2a52674254be/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2024-11-02 11:26:15,270 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4ee0fe1-4269-4c93-97b6-2a52674254be/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-02 11:26:15,270 INFO L396 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-02 11:26:15,270 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-02 11:26:15,270 INFO L85 PathProgramCache]: Analyzing trace with hash -1842852278, now seen corresponding path program 4 times [2024-11-02 11:26:15,271 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-02 11:26:15,271 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1783930870] [2024-11-02 11:26:15,271 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-02 11:26:15,271 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-02 11:26:15,297 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-02 11:26:15,936 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-02 11:26:15,936 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-02 11:26:15,936 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1783930870] [2024-11-02 11:26:15,936 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1783930870] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-02 11:26:15,936 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [630887637] [2024-11-02 11:26:15,936 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2024-11-02 11:26:15,937 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-02 11:26:15,937 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4ee0fe1-4269-4c93-97b6-2a52674254be/bin/utaipan-verify-DbMuA5NWw2/z3 [2024-11-02 11:26:15,939 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4ee0fe1-4269-4c93-97b6-2a52674254be/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-02 11:26:15,942 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4ee0fe1-4269-4c93-97b6-2a52674254be/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2024-11-02 11:26:16,029 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-02 11:26:16,035 INFO L255 TraceCheckSpWp]: Trace formula consists of 126 conjuncts, 24 conjuncts are in the unsatisfiable core [2024-11-02 11:26:16,038 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-02 11:26:16,109 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 33 treesize of output 40 [2024-11-02 11:26:16,119 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 5 [2024-11-02 11:26:16,407 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 67 treesize of output 47 [2024-11-02 11:26:16,436 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-02 11:26:16,436 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-02 11:26:16,681 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2024-11-02 11:26:16,682 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 45 treesize of output 55 [2024-11-02 11:26:16,740 INFO L349 Elim1Store]: treesize reduction 5, result has 37.5 percent of original size [2024-11-02 11:26:16,740 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 24 treesize of output 12 [2024-11-02 11:26:16,752 INFO L349 Elim1Store]: treesize reduction 5, result has 37.5 percent of original size [2024-11-02 11:26:16,753 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 27 treesize of output 15 [2024-11-02 11:26:16,792 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-02 11:26:16,793 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [630887637] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-02 11:26:16,793 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1783920691] [2024-11-02 11:26:16,794 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2024-11-02 11:26:16,795 INFO L166 IcfgInterpreter]: Building call graph [2024-11-02 11:26:16,795 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-02 11:26:16,795 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-02 11:26:16,795 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-02 11:26:17,277 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-02 11:26:17,645 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '789#(and (<= 1 ~CELLCOUNT~0) (<= 0 |ULTIMATE.start_main_~i~0#1|))' at error location [2024-11-02 11:26:17,645 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-02 11:26:17,645 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-02 11:26:17,645 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 10] total 27 [2024-11-02 11:26:17,646 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1636197641] [2024-11-02 11:26:17,646 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-02 11:26:17,646 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2024-11-02 11:26:17,646 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-02 11:26:17,647 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2024-11-02 11:26:17,647 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=150, Invalid=842, Unknown=0, NotChecked=0, Total=992 [2024-11-02 11:26:17,648 INFO L87 Difference]: Start difference. First operand 19 states and 20 transitions. Second operand has 27 states, 27 states have (on average 1.8148148148148149) internal successors, (49), 27 states have internal predecessors, (49), 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) [2024-11-02 11:26:18,170 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-02 11:26:18,171 INFO L93 Difference]: Finished difference Result 28 states and 32 transitions. [2024-11-02 11:26:18,171 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2024-11-02 11:26:18,171 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 1.8148148148148149) internal successors, (49), 27 states have internal predecessors, (49), 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 [2024-11-02 11:26:18,171 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-02 11:26:18,173 INFO L225 Difference]: With dead ends: 28 [2024-11-02 11:26:18,173 INFO L226 Difference]: Without dead ends: 26 [2024-11-02 11:26:18,174 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 32 SyntacticMatches, 1 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 506 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=248, Invalid=1312, Unknown=0, NotChecked=0, Total=1560 [2024-11-02 11:26:18,174 INFO L432 NwaCegarLoop]: 6 mSDtfsCounter, 42 mSDsluCounter, 42 mSDsCounter, 0 mSdLazyCounter, 200 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 42 SdHoareTripleChecker+Valid, 48 SdHoareTripleChecker+Invalid, 211 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 200 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2024-11-02 11:26:18,175 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [42 Valid, 48 Invalid, 211 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 200 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2024-11-02 11:26:18,175 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2024-11-02 11:26:18,181 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 22. [2024-11-02 11:26:18,182 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 21 states have (on average 1.0952380952380953) internal successors, (23), 21 states have internal predecessors, (23), 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) [2024-11-02 11:26:18,182 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 23 transitions. [2024-11-02 11:26:18,183 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 23 transitions. Word has length 18 [2024-11-02 11:26:18,183 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-02 11:26:18,183 INFO L471 AbstractCegarLoop]: Abstraction has 22 states and 23 transitions. [2024-11-02 11:26:18,183 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 27 states have (on average 1.8148148148148149) internal successors, (49), 27 states have internal predecessors, (49), 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) [2024-11-02 11:26:18,184 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 23 transitions. [2024-11-02 11:26:18,184 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2024-11-02 11:26:18,184 INFO L207 NwaCegarLoop]: Found error trace [2024-11-02 11:26:18,184 INFO L215 NwaCegarLoop]: trace histogram [5, 4, 4, 2, 1, 1, 1, 1, 1, 1] [2024-11-02 11:26:18,200 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4ee0fe1-4269-4c93-97b6-2a52674254be/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2024-11-02 11:26:18,385 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4ee0fe1-4269-4c93-97b6-2a52674254be/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-02 11:26:18,385 INFO L396 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-02 11:26:18,386 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-02 11:26:18,386 INFO L85 PathProgramCache]: Analyzing trace with hash -2134959575, now seen corresponding path program 5 times [2024-11-02 11:26:18,386 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-02 11:26:18,386 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1859621883] [2024-11-02 11:26:18,386 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-02 11:26:18,386 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-02 11:26:18,407 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-02 11:26:18,708 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 16 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-02 11:26:18,708 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-02 11:26:18,708 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1859621883] [2024-11-02 11:26:18,708 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1859621883] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-02 11:26:18,708 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2064498533] [2024-11-02 11:26:18,709 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2024-11-02 11:26:18,709 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-02 11:26:18,709 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4ee0fe1-4269-4c93-97b6-2a52674254be/bin/utaipan-verify-DbMuA5NWw2/z3 [2024-11-02 11:26:18,711 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4ee0fe1-4269-4c93-97b6-2a52674254be/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-02 11:26:18,712 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4ee0fe1-4269-4c93-97b6-2a52674254be/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2024-11-02 11:26:18,828 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2024-11-02 11:26:18,828 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-02 11:26:18,829 INFO L255 TraceCheckSpWp]: Trace formula consists of 134 conjuncts, 11 conjuncts are in the unsatisfiable core [2024-11-02 11:26:18,831 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-02 11:26:19,097 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 26 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-02 11:26:19,098 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-02 11:26:19,286 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 26 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-02 11:26:19,286 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2064498533] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-02 11:26:19,286 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [800452066] [2024-11-02 11:26:19,288 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2024-11-02 11:26:19,288 INFO L166 IcfgInterpreter]: Building call graph [2024-11-02 11:26:19,288 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-02 11:26:19,288 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-02 11:26:19,288 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-02 11:26:19,783 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-02 11:26:20,131 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1024#(and (= |ULTIMATE.start_main_~CCCELVOL1~0#1| 1) (<= 1 ~CELLCOUNT~0) (= |ULTIMATE.start_main_~#volArray~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start_main_~CCCELVOL2~0#1| 3))' at error location [2024-11-02 11:26:20,131 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-02 11:26:20,131 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-02 11:26:20,131 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10, 10] total 25 [2024-11-02 11:26:20,132 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1282291422] [2024-11-02 11:26:20,132 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-02 11:26:20,132 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2024-11-02 11:26:20,132 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-02 11:26:20,133 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2024-11-02 11:26:20,134 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=169, Invalid=701, Unknown=0, NotChecked=0, Total=870 [2024-11-02 11:26:20,134 INFO L87 Difference]: Start difference. First operand 22 states and 23 transitions. Second operand has 25 states, 25 states have (on average 2.2) internal successors, (55), 25 states have internal predecessors, (55), 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) [2024-11-02 11:26:20,435 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-02 11:26:20,436 INFO L93 Difference]: Finished difference Result 41 states and 43 transitions. [2024-11-02 11:26:20,436 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2024-11-02 11:26:20,436 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 2.2) internal successors, (55), 25 states have internal predecessors, (55), 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 21 [2024-11-02 11:26:20,437 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-02 11:26:20,437 INFO L225 Difference]: With dead ends: 41 [2024-11-02 11:26:20,437 INFO L226 Difference]: Without dead ends: 23 [2024-11-02 11:26:20,438 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 44 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 470 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=322, Invalid=1318, Unknown=0, NotChecked=0, Total=1640 [2024-11-02 11:26:20,439 INFO L432 NwaCegarLoop]: 7 mSDtfsCounter, 46 mSDsluCounter, 30 mSDsCounter, 0 mSdLazyCounter, 79 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 46 SdHoareTripleChecker+Valid, 37 SdHoareTripleChecker+Invalid, 90 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 79 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2024-11-02 11:26:20,440 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [46 Valid, 37 Invalid, 90 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 79 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2024-11-02 11:26:20,440 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2024-11-02 11:26:20,447 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2024-11-02 11:26:20,448 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 22 states have (on average 1.0909090909090908) internal successors, (24), 22 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-02 11:26:20,448 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 24 transitions. [2024-11-02 11:26:20,449 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 24 transitions. Word has length 21 [2024-11-02 11:26:20,449 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-02 11:26:20,449 INFO L471 AbstractCegarLoop]: Abstraction has 23 states and 24 transitions. [2024-11-02 11:26:20,449 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 2.2) internal successors, (55), 25 states have internal predecessors, (55), 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) [2024-11-02 11:26:20,449 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 24 transitions. [2024-11-02 11:26:20,450 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2024-11-02 11:26:20,450 INFO L207 NwaCegarLoop]: Found error trace [2024-11-02 11:26:20,450 INFO L215 NwaCegarLoop]: trace histogram [5, 4, 4, 3, 1, 1, 1, 1, 1, 1] [2024-11-02 11:26:20,473 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4ee0fe1-4269-4c93-97b6-2a52674254be/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2024-11-02 11:26:20,650 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4ee0fe1-4269-4c93-97b6-2a52674254be/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-02 11:26:20,651 INFO L396 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-02 11:26:20,651 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-02 11:26:20,651 INFO L85 PathProgramCache]: Analyzing trace with hash 2138067207, now seen corresponding path program 6 times [2024-11-02 11:26:20,651 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-02 11:26:20,651 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1663201244] [2024-11-02 11:26:20,651 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-02 11:26:20,651 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-02 11:26:20,703 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-02 11:26:21,443 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 32 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-02 11:26:21,443 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-02 11:26:21,443 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1663201244] [2024-11-02 11:26:21,444 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1663201244] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-02 11:26:21,444 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [209757341] [2024-11-02 11:26:21,444 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2024-11-02 11:26:21,444 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-02 11:26:21,444 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4ee0fe1-4269-4c93-97b6-2a52674254be/bin/utaipan-verify-DbMuA5NWw2/z3 [2024-11-02 11:26:21,446 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4ee0fe1-4269-4c93-97b6-2a52674254be/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-02 11:26:21,449 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4ee0fe1-4269-4c93-97b6-2a52674254be/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2024-11-02 11:26:21,539 INFO L227 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2024-11-02 11:26:21,539 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-02 11:26:21,541 INFO L255 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 27 conjuncts are in the unsatisfiable core [2024-11-02 11:26:21,544 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-02 11:26:21,631 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 37 treesize of output 44 [2024-11-02 11:26:21,688 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 30 [2024-11-02 11:26:21,700 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 48 treesize of output 56 [2024-11-02 11:26:21,708 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 28 [2024-11-02 11:26:21,724 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 33 treesize of output 21 [2024-11-02 11:26:21,727 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 13 [2024-11-02 11:26:22,034 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 77 treesize of output 47 [2024-11-02 11:26:22,073 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 32 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-02 11:26:22,073 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-02 11:26:22,370 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2024-11-02 11:26:22,371 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 45 treesize of output 55 [2024-11-02 11:26:22,460 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 53 treesize of output 38 [2024-11-02 11:26:22,472 INFO L349 Elim1Store]: treesize reduction 5, result has 37.5 percent of original size [2024-11-02 11:26:22,472 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 38 treesize of output 26 [2024-11-02 11:26:22,479 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 4 [2024-11-02 11:26:22,485 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 32 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-02 11:26:22,485 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [209757341] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-02 11:26:22,485 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1574606486] [2024-11-02 11:26:22,487 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2024-11-02 11:26:22,487 INFO L166 IcfgInterpreter]: Building call graph [2024-11-02 11:26:22,488 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-02 11:26:22,488 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-02 11:26:22,488 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-02 11:26:22,783 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-02 11:26:23,200 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1293#(and (<= 1 ~CELLCOUNT~0) (<= 0 |ULTIMATE.start_main_~i~0#1|))' at error location [2024-11-02 11:26:23,200 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-02 11:26:23,200 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-02 11:26:23,200 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12, 12] total 28 [2024-11-02 11:26:23,201 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [528781260] [2024-11-02 11:26:23,201 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-02 11:26:23,201 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2024-11-02 11:26:23,201 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-02 11:26:23,202 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2024-11-02 11:26:23,202 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=110, Invalid=946, Unknown=0, NotChecked=0, Total=1056 [2024-11-02 11:26:23,203 INFO L87 Difference]: Start difference. First operand 23 states and 24 transitions. Second operand has 28 states, 28 states have (on average 2.0) internal successors, (56), 28 states have internal predecessors, (56), 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) [2024-11-02 11:26:24,147 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-02 11:26:24,147 INFO L93 Difference]: Finished difference Result 33 states and 38 transitions. [2024-11-02 11:26:24,148 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2024-11-02 11:26:24,148 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 2.0) internal successors, (56), 28 states have internal predecessors, (56), 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 22 [2024-11-02 11:26:24,148 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-02 11:26:24,149 INFO L225 Difference]: With dead ends: 33 [2024-11-02 11:26:24,149 INFO L226 Difference]: Without dead ends: 31 [2024-11-02 11:26:24,149 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 89 GetRequests, 45 SyntacticMatches, 1 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 438 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=235, Invalid=1745, Unknown=0, NotChecked=0, Total=1980 [2024-11-02 11:26:24,150 INFO L432 NwaCegarLoop]: 7 mSDtfsCounter, 66 mSDsluCounter, 73 mSDsCounter, 0 mSdLazyCounter, 298 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 66 SdHoareTripleChecker+Valid, 80 SdHoareTripleChecker+Invalid, 322 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 298 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2024-11-02 11:26:24,150 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [66 Valid, 80 Invalid, 322 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 298 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2024-11-02 11:26:24,151 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2024-11-02 11:26:24,163 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 26. [2024-11-02 11:26:24,163 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 25 states have (on average 1.08) internal successors, (27), 25 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-02 11:26:24,165 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 27 transitions. [2024-11-02 11:26:24,165 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 27 transitions. Word has length 22 [2024-11-02 11:26:24,165 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-02 11:26:24,165 INFO L471 AbstractCegarLoop]: Abstraction has 26 states and 27 transitions. [2024-11-02 11:26:24,166 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 28 states have (on average 2.0) internal successors, (56), 28 states have internal predecessors, (56), 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) [2024-11-02 11:26:24,166 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 27 transitions. [2024-11-02 11:26:24,166 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2024-11-02 11:26:24,166 INFO L207 NwaCegarLoop]: Found error trace [2024-11-02 11:26:24,167 INFO L215 NwaCegarLoop]: trace histogram [6, 5, 5, 3, 1, 1, 1, 1, 1, 1] [2024-11-02 11:26:24,187 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4ee0fe1-4269-4c93-97b6-2a52674254be/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2024-11-02 11:26:24,371 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4ee0fe1-4269-4c93-97b6-2a52674254be/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-02 11:26:24,372 INFO L396 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-02 11:26:24,372 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-02 11:26:24,372 INFO L85 PathProgramCache]: Analyzing trace with hash 800440908, now seen corresponding path program 7 times [2024-11-02 11:26:24,372 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-02 11:26:24,372 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [69287778] [2024-11-02 11:26:24,372 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-02 11:26:24,373 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-02 11:26:24,437 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-02 11:26:25,054 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 0 proven. 46 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-02 11:26:25,055 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-02 11:26:25,055 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [69287778] [2024-11-02 11:26:25,055 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [69287778] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-02 11:26:25,055 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1533561187] [2024-11-02 11:26:25,055 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2024-11-02 11:26:25,056 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-02 11:26:25,056 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4ee0fe1-4269-4c93-97b6-2a52674254be/bin/utaipan-verify-DbMuA5NWw2/z3 [2024-11-02 11:26:25,058 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4ee0fe1-4269-4c93-97b6-2a52674254be/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-02 11:26:25,059 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4ee0fe1-4269-4c93-97b6-2a52674254be/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2024-11-02 11:26:25,192 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-02 11:26:25,197 INFO L255 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 29 conjuncts are in the unsatisfiable core [2024-11-02 11:26:25,199 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-02 11:26:25,329 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 1 [2024-11-02 11:26:25,336 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2024-11-02 11:26:25,764 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 67 treesize of output 47 [2024-11-02 11:26:25,803 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 0 proven. 46 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-02 11:26:25,804 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-02 11:26:26,206 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2024-11-02 11:26:26,207 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 45 treesize of output 55 [2024-11-02 11:26:26,241 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 50 treesize of output 34 [2024-11-02 11:26:26,252 INFO L349 Elim1Store]: treesize reduction 5, result has 37.5 percent of original size [2024-11-02 11:26:26,252 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 24 treesize of output 12 [2024-11-02 11:26:26,260 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 4 [2024-11-02 11:26:26,341 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 0 proven. 46 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-02 11:26:26,341 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1533561187] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-02 11:26:26,341 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2122749400] [2024-11-02 11:26:26,343 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2024-11-02 11:26:26,343 INFO L166 IcfgInterpreter]: Building call graph [2024-11-02 11:26:26,343 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-02 11:26:26,343 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-02 11:26:26,344 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-02 11:26:26,677 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-02 11:26:27,160 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1585#(and (<= 1 ~CELLCOUNT~0) (<= 0 |ULTIMATE.start_main_~i~0#1|))' at error location [2024-11-02 11:26:27,161 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-02 11:26:27,161 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-02 11:26:27,161 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 13] total 36 [2024-11-02 11:26:27,161 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1007489868] [2024-11-02 11:26:27,161 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-02 11:26:27,161 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2024-11-02 11:26:27,162 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-02 11:26:27,162 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2024-11-02 11:26:27,163 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=157, Invalid=1483, Unknown=0, NotChecked=0, Total=1640 [2024-11-02 11:26:27,163 INFO L87 Difference]: Start difference. First operand 26 states and 27 transitions. Second operand has 36 states, 36 states have (on average 1.9444444444444444) internal successors, (70), 36 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) [2024-11-02 11:26:29,161 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-02 11:26:29,162 INFO L93 Difference]: Finished difference Result 53 states and 60 transitions. [2024-11-02 11:26:29,162 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2024-11-02 11:26:29,162 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 36 states have (on average 1.9444444444444444) internal successors, (70), 36 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) Word has length 25 [2024-11-02 11:26:29,163 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-02 11:26:29,164 INFO L225 Difference]: With dead ends: 53 [2024-11-02 11:26:29,164 INFO L226 Difference]: Without dead ends: 51 [2024-11-02 11:26:29,167 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 47 SyntacticMatches, 1 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 793 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=489, Invalid=3543, Unknown=0, NotChecked=0, Total=4032 [2024-11-02 11:26:29,168 INFO L432 NwaCegarLoop]: 7 mSDtfsCounter, 116 mSDsluCounter, 106 mSDsCounter, 0 mSdLazyCounter, 546 mSolverCounterSat, 42 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 116 SdHoareTripleChecker+Valid, 113 SdHoareTripleChecker+Invalid, 588 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 42 IncrementalHoareTripleChecker+Valid, 546 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2024-11-02 11:26:29,168 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [116 Valid, 113 Invalid, 588 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [42 Valid, 546 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2024-11-02 11:26:29,168 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2024-11-02 11:26:29,181 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 29. [2024-11-02 11:26:29,182 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 28 states have (on average 1.0714285714285714) internal successors, (30), 28 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-02 11:26:29,185 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 30 transitions. [2024-11-02 11:26:29,186 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 30 transitions. Word has length 25 [2024-11-02 11:26:29,186 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-02 11:26:29,186 INFO L471 AbstractCegarLoop]: Abstraction has 29 states and 30 transitions. [2024-11-02 11:26:29,186 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 36 states have (on average 1.9444444444444444) internal successors, (70), 36 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) [2024-11-02 11:26:29,186 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 30 transitions. [2024-11-02 11:26:29,187 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2024-11-02 11:26:29,189 INFO L207 NwaCegarLoop]: Found error trace [2024-11-02 11:26:29,189 INFO L215 NwaCegarLoop]: trace histogram [7, 6, 6, 3, 1, 1, 1, 1, 1, 1] [2024-11-02 11:26:29,210 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4ee0fe1-4269-4c93-97b6-2a52674254be/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2024-11-02 11:26:29,393 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4ee0fe1-4269-4c93-97b6-2a52674254be/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-02 11:26:29,394 INFO L396 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-02 11:26:29,394 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-02 11:26:29,394 INFO L85 PathProgramCache]: Analyzing trace with hash 281939687, now seen corresponding path program 8 times [2024-11-02 11:26:29,394 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-02 11:26:29,395 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [882450511] [2024-11-02 11:26:29,395 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-02 11:26:29,395 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-02 11:26:29,425 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-02 11:26:29,891 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 41 proven. 22 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-02 11:26:29,892 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-02 11:26:29,892 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [882450511] [2024-11-02 11:26:29,892 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [882450511] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-02 11:26:29,892 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [809968830] [2024-11-02 11:26:29,892 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2024-11-02 11:26:29,893 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-02 11:26:29,893 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4ee0fe1-4269-4c93-97b6-2a52674254be/bin/utaipan-verify-DbMuA5NWw2/z3 [2024-11-02 11:26:29,895 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4ee0fe1-4269-4c93-97b6-2a52674254be/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-02 11:26:29,897 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4ee0fe1-4269-4c93-97b6-2a52674254be/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2024-11-02 11:26:30,113 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2024-11-02 11:26:30,113 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-02 11:26:30,115 INFO L255 TraceCheckSpWp]: Trace formula consists of 167 conjuncts, 14 conjuncts are in the unsatisfiable core [2024-11-02 11:26:30,117 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-02 11:26:30,519 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 57 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-02 11:26:30,519 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-02 11:26:30,808 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 57 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-02 11:26:30,809 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [809968830] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-02 11:26:30,809 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [961453206] [2024-11-02 11:26:30,810 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2024-11-02 11:26:30,810 INFO L166 IcfgInterpreter]: Building call graph [2024-11-02 11:26:30,811 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-02 11:26:30,811 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-02 11:26:30,811 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs