./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/loop-acceleration/array_4.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 9bd2c7ff Calling Ultimate with: /usr/lib/jvm/java-11-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6af9be8-f306-4156-ade8-a271a3411011/bin/utaipan-verify-t7M7D8N6sZ/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6af9be8-f306-4156-ade8-a271a3411011/bin/utaipan-verify-t7M7D8N6sZ/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6af9be8-f306-4156-ade8-a271a3411011/bin/utaipan-verify-t7M7D8N6sZ/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6af9be8-f306-4156-ade8-a271a3411011/bin/utaipan-verify-t7M7D8N6sZ/config/TaipanReach.xml -i ../../sv-benchmarks/c/loop-acceleration/array_4.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6af9be8-f306-4156-ade8-a271a3411011/bin/utaipan-verify-t7M7D8N6sZ/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6af9be8-f306-4156-ade8-a271a3411011/bin/utaipan-verify-t7M7D8N6sZ --witnessprinter.witness.filename witness --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash e8c27e61ac5d5a22c0e00a5dbac1b872460567877a501387ed9d5bda89096498 --- Real Ultimate output --- This is Ultimate 0.2.3-dev-9bd2c7f [2023-11-19 04:51:45,557 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-19 04:51:45,694 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6af9be8-f306-4156-ade8-a271a3411011/bin/utaipan-verify-t7M7D8N6sZ/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-11-19 04:51:45,704 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-19 04:51:45,706 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-19 04:51:45,753 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-19 04:51:45,753 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-19 04:51:45,754 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-19 04:51:45,755 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-19 04:51:45,756 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-19 04:51:45,756 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-19 04:51:45,757 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-19 04:51:45,758 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-19 04:51:45,758 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-19 04:51:45,759 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-19 04:51:45,760 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-19 04:51:45,760 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-19 04:51:45,761 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-19 04:51:45,762 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-19 04:51:45,762 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-19 04:51:45,763 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-19 04:51:45,764 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-19 04:51:45,765 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-19 04:51:45,765 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-11-19 04:51:45,766 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-19 04:51:45,766 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-19 04:51:45,766 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-19 04:51:45,767 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-19 04:51:45,767 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-11-19 04:51:45,768 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-19 04:51:45,768 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-11-19 04:51:45,769 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-19 04:51:45,769 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-11-19 04:51:45,770 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-19 04:51:45,770 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-19 04:51:45,770 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-19 04:51:45,770 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-19 04:51:45,771 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-19 04:51:45,771 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-19 04:51:45,771 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-11-19 04:51:45,772 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-19 04:51:45,772 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-19 04:51:45,772 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-11-19 04:51:45,773 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-19 04:51:45,773 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-19 04:51:45,773 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_c6af9be8-f306-4156-ade8-a271a3411011/bin/utaipan-verify-t7M7D8N6sZ/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6af9be8-f306-4156-ade8-a271a3411011/bin/utaipan-verify-t7M7D8N6sZ Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> e8c27e61ac5d5a22c0e00a5dbac1b872460567877a501387ed9d5bda89096498 [2023-11-19 04:51:46,063 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-19 04:51:46,091 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-19 04:51:46,093 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-19 04:51:46,095 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-19 04:51:46,095 INFO L274 PluginConnector]: CDTParser initialized [2023-11-19 04:51:46,098 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6af9be8-f306-4156-ade8-a271a3411011/bin/utaipan-verify-t7M7D8N6sZ/../../sv-benchmarks/c/loop-acceleration/array_4.i [2023-11-19 04:51:49,498 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-19 04:51:49,805 INFO L384 CDTParser]: Found 1 translation units. [2023-11-19 04:51:49,806 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6af9be8-f306-4156-ade8-a271a3411011/sv-benchmarks/c/loop-acceleration/array_4.i [2023-11-19 04:51:49,815 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6af9be8-f306-4156-ade8-a271a3411011/bin/utaipan-verify-t7M7D8N6sZ/data/92d44308b/9b8a85b47e5f4eefb6d72b417b632bec/FLAG741e3c6bc [2023-11-19 04:51:49,835 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6af9be8-f306-4156-ade8-a271a3411011/bin/utaipan-verify-t7M7D8N6sZ/data/92d44308b/9b8a85b47e5f4eefb6d72b417b632bec [2023-11-19 04:51:49,842 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-19 04:51:49,844 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-19 04:51:49,846 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-19 04:51:49,846 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-19 04:51:49,853 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-19 04:51:49,854 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 04:51:49" (1/1) ... [2023-11-19 04:51:49,855 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5263728 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:51:49, skipping insertion in model container [2023-11-19 04:51:49,855 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 04:51:49" (1/1) ... [2023-11-19 04:51:49,883 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-19 04:51:50,094 WARN L240 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6af9be8-f306-4156-ade8-a271a3411011/sv-benchmarks/c/loop-acceleration/array_4.i[848,861] [2023-11-19 04:51:50,108 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-19 04:51:50,119 INFO L202 MainTranslator]: Completed pre-run [2023-11-19 04:51:50,133 WARN L240 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6af9be8-f306-4156-ade8-a271a3411011/sv-benchmarks/c/loop-acceleration/array_4.i[848,861] [2023-11-19 04:51:50,138 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-19 04:51:50,156 INFO L206 MainTranslator]: Completed translation [2023-11-19 04:51:50,157 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:51:50 WrapperNode [2023-11-19 04:51:50,157 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-19 04:51:50,158 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-19 04:51:50,159 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-19 04:51:50,159 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-19 04:51:50,168 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:51:50" (1/1) ... [2023-11-19 04:51:50,176 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:51:50" (1/1) ... [2023-11-19 04:51:50,195 INFO L138 Inliner]: procedures = 16, calls = 12, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 43 [2023-11-19 04:51:50,196 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-19 04:51:50,196 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-19 04:51:50,197 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-19 04:51:50,197 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-19 04:51:50,207 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:51:50" (1/1) ... [2023-11-19 04:51:50,207 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:51:50" (1/1) ... [2023-11-19 04:51:50,210 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:51:50" (1/1) ... [2023-11-19 04:51:50,210 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:51:50" (1/1) ... [2023-11-19 04:51:50,216 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:51:50" (1/1) ... [2023-11-19 04:51:50,220 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:51:50" (1/1) ... [2023-11-19 04:51:50,221 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:51:50" (1/1) ... [2023-11-19 04:51:50,222 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:51:50" (1/1) ... [2023-11-19 04:51:50,227 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-19 04:51:50,238 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-19 04:51:50,238 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-19 04:51:50,239 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-19 04:51:50,240 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:51:50" (1/1) ... [2023-11-19 04:51:50,248 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-19 04:51:50,271 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6af9be8-f306-4156-ade8-a271a3411011/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 04:51:50,288 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6af9be8-f306-4156-ade8-a271a3411011/bin/utaipan-verify-t7M7D8N6sZ/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-19 04:51:50,300 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6af9be8-f306-4156-ade8-a271a3411011/bin/utaipan-verify-t7M7D8N6sZ/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-19 04:51:50,328 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-19 04:51:50,328 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-19 04:51:50,328 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-11-19 04:51:50,329 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-11-19 04:51:50,329 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-19 04:51:50,329 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-19 04:51:50,329 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-11-19 04:51:50,330 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-11-19 04:51:50,406 INFO L236 CfgBuilder]: Building ICFG [2023-11-19 04:51:50,409 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-19 04:51:50,549 INFO L277 CfgBuilder]: Performing block encoding [2023-11-19 04:51:50,585 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-19 04:51:50,585 INFO L302 CfgBuilder]: Removed 2 assume(true) statements. [2023-11-19 04:51:50,589 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 04:51:50 BoogieIcfgContainer [2023-11-19 04:51:50,589 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-19 04:51:50,593 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-19 04:51:50,593 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-19 04:51:50,597 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-19 04:51:50,597 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 19.11 04:51:49" (1/3) ... [2023-11-19 04:51:50,598 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@67221b19 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 04:51:50, skipping insertion in model container [2023-11-19 04:51:50,598 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:51:50" (2/3) ... [2023-11-19 04:51:50,599 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@67221b19 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 04:51:50, skipping insertion in model container [2023-11-19 04:51:50,599 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 04:51:50" (3/3) ... [2023-11-19 04:51:50,600 INFO L112 eAbstractionObserver]: Analyzing ICFG array_4.i [2023-11-19 04:51:50,623 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-19 04:51:50,624 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-11-19 04:51:50,676 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-19 04:51:50,684 INFO L357 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopHeads, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mPorIndependenceSettings=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@1c6072ee, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-19 04:51:50,685 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-11-19 04:51:50,689 INFO L276 IsEmpty]: Start isEmpty. Operand has 10 states, 8 states have (on average 1.625) internal successors, (13), 9 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 04:51:50,697 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2023-11-19 04:51:50,697 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 04:51:50,698 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2023-11-19 04:51:50,699 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 04:51:50,705 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 04:51:50,705 INFO L85 PathProgramCache]: Analyzing trace with hash -1984346455, now seen corresponding path program 1 times [2023-11-19 04:51:50,718 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 04:51:50,718 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1550303913] [2023-11-19 04:51:50,719 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 04:51:50,719 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 04:51:50,870 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 04:51:50,928 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 04:51:50,928 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 04:51:50,929 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1550303913] [2023-11-19 04:51:50,930 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1550303913] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 04:51:50,930 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-19 04:51:50,930 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-19 04:51:50,932 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [196339752] [2023-11-19 04:51:50,933 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 04:51:50,939 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2023-11-19 04:51:50,939 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 04:51:50,980 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2023-11-19 04:51:50,982 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2023-11-19 04:51:50,985 INFO L87 Difference]: Start difference. First operand has 10 states, 8 states have (on average 1.625) internal successors, (13), 9 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) Second operand has 2 states, 2 states have (on average 3.0) internal successors, (6), 2 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 04:51:51,045 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 04:51:51,045 INFO L93 Difference]: Finished difference Result 16 states and 19 transitions. [2023-11-19 04:51:51,048 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2023-11-19 04:51:51,050 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 3.0) internal successors, (6), 2 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2023-11-19 04:51:51,051 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 04:51:51,060 INFO L225 Difference]: With dead ends: 16 [2023-11-19 04:51:51,060 INFO L226 Difference]: Without dead ends: 8 [2023-11-19 04:51:51,063 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2023-11-19 04:51:51,070 INFO L413 NwaCegarLoop]: 6 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 5 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 6 SdHoareTripleChecker+Invalid, 5 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 5 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-19 04:51:51,072 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 6 Invalid, 5 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 5 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-19 04:51:51,092 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8 states. [2023-11-19 04:51:51,107 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8 to 8. [2023-11-19 04:51:51,108 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 8 states, 7 states have (on average 1.2857142857142858) internal successors, (9), 7 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 04:51:51,109 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8 states to 8 states and 9 transitions. [2023-11-19 04:51:51,111 INFO L78 Accepts]: Start accepts. Automaton has 8 states and 9 transitions. Word has length 6 [2023-11-19 04:51:51,111 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 04:51:51,112 INFO L495 AbstractCegarLoop]: Abstraction has 8 states and 9 transitions. [2023-11-19 04:51:51,114 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 3.0) internal successors, (6), 2 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 04:51:51,115 INFO L276 IsEmpty]: Start isEmpty. Operand 8 states and 9 transitions. [2023-11-19 04:51:51,115 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2023-11-19 04:51:51,116 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 04:51:51,116 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2023-11-19 04:51:51,116 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-19 04:51:51,117 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 04:51:51,118 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 04:51:51,118 INFO L85 PathProgramCache]: Analyzing trace with hash -1393750887, now seen corresponding path program 1 times [2023-11-19 04:51:51,118 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 04:51:51,119 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2011183256] [2023-11-19 04:51:51,119 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 04:51:51,120 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 04:51:51,177 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 04:51:51,254 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 04:51:51,255 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 04:51:51,261 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2011183256] [2023-11-19 04:51:51,261 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2011183256] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 04:51:51,262 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-19 04:51:51,262 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-19 04:51:51,262 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1111976174] [2023-11-19 04:51:51,263 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 04:51:51,264 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-19 04:51:51,264 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 04:51:51,265 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-19 04:51:51,266 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-19 04:51:51,266 INFO L87 Difference]: Start difference. First operand 8 states and 9 transitions. Second operand has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 04:51:51,318 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 04:51:51,318 INFO L93 Difference]: Finished difference Result 21 states and 23 transitions. [2023-11-19 04:51:51,319 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-19 04:51:51,319 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2023-11-19 04:51:51,319 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 04:51:51,320 INFO L225 Difference]: With dead ends: 21 [2023-11-19 04:51:51,320 INFO L226 Difference]: Without dead ends: 15 [2023-11-19 04:51:51,321 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-19 04:51:51,323 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 5 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 10 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 6 SdHoareTripleChecker+Invalid, 11 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 10 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-19 04:51:51,324 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [5 Valid, 6 Invalid, 11 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 10 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-19 04:51:51,325 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2023-11-19 04:51:51,328 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 9. [2023-11-19 04:51:51,328 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9 states, 8 states have (on average 1.25) internal successors, (10), 8 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 04:51:51,329 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9 states to 9 states and 10 transitions. [2023-11-19 04:51:51,329 INFO L78 Accepts]: Start accepts. Automaton has 9 states and 10 transitions. Word has length 7 [2023-11-19 04:51:51,330 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 04:51:51,330 INFO L495 AbstractCegarLoop]: Abstraction has 9 states and 10 transitions. [2023-11-19 04:51:51,330 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 04:51:51,337 INFO L276 IsEmpty]: Start isEmpty. Operand 9 states and 10 transitions. [2023-11-19 04:51:51,340 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2023-11-19 04:51:51,341 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 04:51:51,341 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 04:51:51,341 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-11-19 04:51:51,342 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 04:51:51,343 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 04:51:51,343 INFO L85 PathProgramCache]: Analyzing trace with hash -373538295, now seen corresponding path program 1 times [2023-11-19 04:51:51,343 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 04:51:51,344 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [422704136] [2023-11-19 04:51:51,344 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 04:51:51,344 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 04:51:51,384 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 04:51:51,461 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 04:51:51,462 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 04:51:51,462 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [422704136] [2023-11-19 04:51:51,463 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [422704136] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 04:51:51,463 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2115911178] [2023-11-19 04:51:51,463 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 04:51:51,463 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 04:51:51,464 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6af9be8-f306-4156-ade8-a271a3411011/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 04:51:51,466 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6af9be8-f306-4156-ade8-a271a3411011/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 04:51:51,489 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6af9be8-f306-4156-ade8-a271a3411011/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-19 04:51:51,563 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 04:51:51,565 INFO L262 TraceCheckSpWp]: Trace formula consists of 58 conjuncts, 3 conjunts are in the unsatisfiable core [2023-11-19 04:51:51,571 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 04:51:51,639 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 04:51:51,640 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 04:51:51,686 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 04:51:51,688 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2115911178] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 04:51:51,688 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [608287218] [2023-11-19 04:51:51,725 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2023-11-19 04:51:51,726 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 04:51:51,731 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 04:51:51,739 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 04:51:51,740 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 04:51:52,372 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-19 04:51:52,534 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSifa [608287218] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 04:51:52,534 INFO L185 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2023-11-19 04:51:52,535 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [3, 3, 3] total 11 [2023-11-19 04:51:52,535 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1648771019] [2023-11-19 04:51:52,536 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 04:51:52,536 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-11-19 04:51:52,536 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 04:51:52,537 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-11-19 04:51:52,538 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=73, Unknown=0, NotChecked=0, Total=132 [2023-11-19 04:51:52,538 INFO L87 Difference]: Start difference. First operand 9 states and 10 transitions. Second operand has 7 states, 7 states have (on average 1.1428571428571428) internal successors, (8), 6 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 04:51:52,600 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 04:51:52,600 INFO L93 Difference]: Finished difference Result 15 states and 16 transitions. [2023-11-19 04:51:52,601 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-11-19 04:51:52,601 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 1.1428571428571428) internal successors, (8), 6 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2023-11-19 04:51:52,602 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 04:51:52,602 INFO L225 Difference]: With dead ends: 15 [2023-11-19 04:51:52,602 INFO L226 Difference]: Without dead ends: 11 [2023-11-19 04:51:52,603 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 42 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=59, Invalid=73, Unknown=0, NotChecked=0, Total=132 [2023-11-19 04:51:52,605 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 5 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 26 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 10 SdHoareTripleChecker+Invalid, 28 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 26 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-19 04:51:52,606 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [5 Valid, 10 Invalid, 28 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 26 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-19 04:51:52,607 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11 states. [2023-11-19 04:51:52,611 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11 to 11. [2023-11-19 04:51:52,611 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 11 states, 10 states have (on average 1.2) internal successors, (12), 10 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 04:51:52,612 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 12 transitions. [2023-11-19 04:51:52,612 INFO L78 Accepts]: Start accepts. Automaton has 11 states and 12 transitions. Word has length 8 [2023-11-19 04:51:52,612 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 04:51:52,612 INFO L495 AbstractCegarLoop]: Abstraction has 11 states and 12 transitions. [2023-11-19 04:51:52,613 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 1.1428571428571428) internal successors, (8), 6 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 04:51:52,613 INFO L276 IsEmpty]: Start isEmpty. Operand 11 states and 12 transitions. [2023-11-19 04:51:52,613 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2023-11-19 04:51:52,613 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 04:51:52,614 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 04:51:52,643 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6af9be8-f306-4156-ade8-a271a3411011/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-11-19 04:51:52,830 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6af9be8-f306-4156-ade8-a271a3411011/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 04:51:52,830 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 04:51:52,831 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 04:51:52,831 INFO L85 PathProgramCache]: Analyzing trace with hash -1754148148, now seen corresponding path program 1 times [2023-11-19 04:51:52,831 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 04:51:52,831 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [781006599] [2023-11-19 04:51:52,832 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 04:51:52,832 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 04:51:52,851 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 04:51:52,946 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-19 04:51:52,947 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 04:51:52,947 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [781006599] [2023-11-19 04:51:52,947 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [781006599] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 04:51:52,947 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [783103566] [2023-11-19 04:51:52,948 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 04:51:52,948 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 04:51:52,948 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6af9be8-f306-4156-ade8-a271a3411011/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 04:51:52,949 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6af9be8-f306-4156-ade8-a271a3411011/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 04:51:52,953 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6af9be8-f306-4156-ade8-a271a3411011/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-19 04:51:53,020 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 04:51:53,021 INFO L262 TraceCheckSpWp]: Trace formula consists of 63 conjuncts, 3 conjunts are in the unsatisfiable core [2023-11-19 04:51:53,022 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 04:51:53,032 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-19 04:51:53,032 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 04:51:53,048 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-19 04:51:53,049 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [783103566] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 04:51:53,049 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1274298367] [2023-11-19 04:51:53,051 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2023-11-19 04:51:53,051 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 04:51:53,052 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 04:51:53,052 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 04:51:53,052 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 04:51:53,356 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-19 04:51:53,471 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '233#(and (<= 1 |#StackHeapBarrier|) (<= 2 |ULTIMATE.start_main_~#A~0#1.base|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= |ULTIMATE.start_main_~#A~0#1.offset| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#A~0#1.base|) (* |ULTIMATE.start_main_~i~0#1| 4)) 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0) (<= 1025 |ULTIMATE.start_main_~i~0#1|))' at error location [2023-11-19 04:51:53,471 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-19 04:51:53,471 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-19 04:51:53,471 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 6 [2023-11-19 04:51:53,472 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [483895962] [2023-11-19 04:51:53,472 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-19 04:51:53,472 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-11-19 04:51:53,473 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 04:51:53,473 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-11-19 04:51:53,474 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=94, Unknown=0, NotChecked=0, Total=132 [2023-11-19 04:51:53,474 INFO L87 Difference]: Start difference. First operand 11 states and 12 transitions. Second operand has 7 states, 7 states have (on average 2.0) internal successors, (14), 6 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 04:51:53,511 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 04:51:53,511 INFO L93 Difference]: Finished difference Result 40 states and 44 transitions. [2023-11-19 04:51:53,512 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-19 04:51:53,512 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.0) internal successors, (14), 6 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 10 [2023-11-19 04:51:53,512 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 04:51:53,513 INFO L225 Difference]: With dead ends: 40 [2023-11-19 04:51:53,513 INFO L226 Difference]: Without dead ends: 32 [2023-11-19 04:51:53,513 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=38, Invalid=94, Unknown=0, NotChecked=0, Total=132 [2023-11-19 04:51:53,515 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 22 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 22 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 22 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 29 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 22 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-19 04:51:53,515 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [22 Valid, 15 Invalid, 29 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 22 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-19 04:51:53,516 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2023-11-19 04:51:53,520 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 14. [2023-11-19 04:51:53,520 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14 states, 13 states have (on average 1.1538461538461537) internal successors, (15), 13 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 04:51:53,520 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 15 transitions. [2023-11-19 04:51:53,521 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 15 transitions. Word has length 10 [2023-11-19 04:51:53,521 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 04:51:53,521 INFO L495 AbstractCegarLoop]: Abstraction has 14 states and 15 transitions. [2023-11-19 04:51:53,521 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 2.0) internal successors, (14), 6 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 04:51:53,521 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 15 transitions. [2023-11-19 04:51:53,522 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2023-11-19 04:51:53,522 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 04:51:53,522 INFO L195 NwaCegarLoop]: trace histogram [4, 2, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 04:51:53,555 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6af9be8-f306-4156-ade8-a271a3411011/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-11-19 04:51:53,745 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6af9be8-f306-4156-ade8-a271a3411011/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 04:51:53,746 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 04:51:53,746 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 04:51:53,746 INFO L85 PathProgramCache]: Analyzing trace with hash -680716964, now seen corresponding path program 2 times [2023-11-19 04:51:53,746 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 04:51:53,747 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [229163407] [2023-11-19 04:51:53,747 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 04:51:53,747 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 04:51:53,766 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 04:51:53,905 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-11-19 04:51:53,906 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 04:51:53,906 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [229163407] [2023-11-19 04:51:53,906 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [229163407] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 04:51:53,906 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [335893097] [2023-11-19 04:51:53,906 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-19 04:51:53,907 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 04:51:53,907 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6af9be8-f306-4156-ade8-a271a3411011/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 04:51:53,908 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6af9be8-f306-4156-ade8-a271a3411011/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 04:51:53,925 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6af9be8-f306-4156-ade8-a271a3411011/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-19 04:51:53,970 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2023-11-19 04:51:53,970 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-19 04:51:53,971 INFO L262 TraceCheckSpWp]: Trace formula consists of 72 conjuncts, 5 conjunts are in the unsatisfiable core [2023-11-19 04:51:53,973 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 04:51:53,995 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-11-19 04:51:53,996 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 04:51:54,027 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-11-19 04:51:54,027 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [335893097] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 04:51:54,028 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [786921450] [2023-11-19 04:51:54,030 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2023-11-19 04:51:54,030 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 04:51:54,031 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 04:51:54,031 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 04:51:54,031 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 04:51:54,213 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-19 04:51:54,327 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '392#(and (<= 1 |#StackHeapBarrier|) (<= 2 |ULTIMATE.start_main_~#A~0#1.base|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= |ULTIMATE.start_main_~#A~0#1.offset| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#A~0#1.base|) (* |ULTIMATE.start_main_~i~0#1| 4)) 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0) (<= 1025 |ULTIMATE.start_main_~i~0#1|))' at error location [2023-11-19 04:51:54,327 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-19 04:51:54,327 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-19 04:51:54,327 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 9 [2023-11-19 04:51:54,328 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [317035235] [2023-11-19 04:51:54,328 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-19 04:51:54,328 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2023-11-19 04:51:54,328 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 04:51:54,329 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2023-11-19 04:51:54,329 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=139, Unknown=0, NotChecked=0, Total=182 [2023-11-19 04:51:54,330 INFO L87 Difference]: Start difference. First operand 14 states and 15 transitions. Second operand has 9 states, 9 states have (on average 2.3333333333333335) internal successors, (21), 9 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 04:51:54,393 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 04:51:54,393 INFO L93 Difference]: Finished difference Result 28 states and 31 transitions. [2023-11-19 04:51:54,393 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2023-11-19 04:51:54,394 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.3333333333333335) internal successors, (21), 9 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 13 [2023-11-19 04:51:54,394 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 04:51:54,394 INFO L225 Difference]: With dead ends: 28 [2023-11-19 04:51:54,395 INFO L226 Difference]: Without dead ends: 20 [2023-11-19 04:51:54,395 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 29 SyntacticMatches, 1 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 63 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=64, Invalid=208, Unknown=0, NotChecked=0, Total=272 [2023-11-19 04:51:54,396 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 4 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 34 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 40 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 34 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-19 04:51:54,397 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [4 Valid, 19 Invalid, 40 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 34 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-19 04:51:54,397 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2023-11-19 04:51:54,402 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2023-11-19 04:51:54,402 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 19 states have (on average 1.105263157894737) internal successors, (21), 19 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 04:51:54,403 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 21 transitions. [2023-11-19 04:51:54,403 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 21 transitions. Word has length 13 [2023-11-19 04:51:54,403 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 04:51:54,403 INFO L495 AbstractCegarLoop]: Abstraction has 20 states and 21 transitions. [2023-11-19 04:51:54,404 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 2.3333333333333335) internal successors, (21), 9 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 04:51:54,404 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 21 transitions. [2023-11-19 04:51:54,404 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2023-11-19 04:51:54,405 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 04:51:54,405 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 1, 1, 1, 1, 1, 1] [2023-11-19 04:51:54,433 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6af9be8-f306-4156-ade8-a271a3411011/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-11-19 04:51:54,617 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6af9be8-f306-4156-ade8-a271a3411011/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 04:51:54,618 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 04:51:54,618 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 04:51:54,618 INFO L85 PathProgramCache]: Analyzing trace with hash 1146847013, now seen corresponding path program 3 times [2023-11-19 04:51:54,618 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 04:51:54,618 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1911911935] [2023-11-19 04:51:54,619 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 04:51:54,619 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 04:51:54,644 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 04:51:54,741 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2023-11-19 04:51:54,742 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 04:51:54,742 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1911911935] [2023-11-19 04:51:54,742 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1911911935] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 04:51:54,742 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1850753976] [2023-11-19 04:51:54,742 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-11-19 04:51:54,743 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 04:51:54,743 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6af9be8-f306-4156-ade8-a271a3411011/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 04:51:54,744 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6af9be8-f306-4156-ade8-a271a3411011/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 04:51:54,769 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6af9be8-f306-4156-ade8-a271a3411011/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-11-19 04:51:54,816 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-11-19 04:51:54,816 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-19 04:51:54,817 INFO L262 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 6 conjunts are in the unsatisfiable core [2023-11-19 04:51:54,818 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 04:51:54,833 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2023-11-19 04:51:54,833 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 04:51:54,889 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2023-11-19 04:51:54,889 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1850753976] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 04:51:54,890 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1856392687] [2023-11-19 04:51:54,892 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2023-11-19 04:51:54,892 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 04:51:54,892 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 04:51:54,893 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 04:51:54,893 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 04:51:55,061 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-19 04:51:55,194 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '592#(and (<= 1 |#StackHeapBarrier|) (<= 2 |ULTIMATE.start_main_~#A~0#1.base|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= |ULTIMATE.start_main_~#A~0#1.offset| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#A~0#1.base|) (* |ULTIMATE.start_main_~i~0#1| 4)) 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0) (<= 1025 |ULTIMATE.start_main_~i~0#1|))' at error location [2023-11-19 04:51:55,195 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-19 04:51:55,195 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-19 04:51:55,195 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 12 [2023-11-19 04:51:55,195 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2022526602] [2023-11-19 04:51:55,196 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-19 04:51:55,196 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2023-11-19 04:51:55,196 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 04:51:55,197 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2023-11-19 04:51:55,198 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=211, Unknown=0, NotChecked=0, Total=306 [2023-11-19 04:51:55,198 INFO L87 Difference]: Start difference. First operand 20 states and 21 transitions. Second operand has 13 states, 13 states have (on average 1.5384615384615385) internal successors, (20), 12 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 04:51:55,294 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 04:51:55,294 INFO L93 Difference]: Finished difference Result 76 states and 83 transitions. [2023-11-19 04:51:55,294 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2023-11-19 04:51:55,295 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.5384615384615385) internal successors, (20), 12 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) Word has length 19 [2023-11-19 04:51:55,295 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 04:51:55,296 INFO L225 Difference]: With dead ends: 76 [2023-11-19 04:51:55,296 INFO L226 Difference]: Without dead ends: 62 [2023-11-19 04:51:55,297 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 45 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 92 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=95, Invalid=211, Unknown=0, NotChecked=0, Total=306 [2023-11-19 04:51:55,297 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 79 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 45 mSolverCounterSat, 28 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 79 SdHoareTripleChecker+Valid, 30 SdHoareTripleChecker+Invalid, 73 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 28 IncrementalHoareTripleChecker+Valid, 45 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-19 04:51:55,298 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [79 Valid, 30 Invalid, 73 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [28 Valid, 45 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-19 04:51:55,299 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2023-11-19 04:51:55,306 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 26. [2023-11-19 04:51:55,307 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) [2023-11-19 04:51:55,307 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 27 transitions. [2023-11-19 04:51:55,308 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 27 transitions. Word has length 19 [2023-11-19 04:51:55,308 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 04:51:55,308 INFO L495 AbstractCegarLoop]: Abstraction has 26 states and 27 transitions. [2023-11-19 04:51:55,308 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 1.5384615384615385) internal successors, (20), 12 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 04:51:55,309 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 27 transitions. [2023-11-19 04:51:55,309 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2023-11-19 04:51:55,309 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 04:51:55,310 INFO L195 NwaCegarLoop]: trace histogram [10, 5, 4, 1, 1, 1, 1, 1, 1] [2023-11-19 04:51:55,337 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6af9be8-f306-4156-ade8-a271a3411011/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-11-19 04:51:55,532 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6af9be8-f306-4156-ade8-a271a3411011/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 04:51:55,532 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 04:51:55,533 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 04:51:55,533 INFO L85 PathProgramCache]: Analyzing trace with hash 940968229, now seen corresponding path program 4 times [2023-11-19 04:51:55,533 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 04:51:55,533 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [247865446] [2023-11-19 04:51:55,533 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 04:51:55,533 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 04:51:55,559 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 04:51:55,793 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2023-11-19 04:51:55,794 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 04:51:55,794 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [247865446] [2023-11-19 04:51:55,794 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [247865446] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 04:51:55,794 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1498433405] [2023-11-19 04:51:55,796 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-11-19 04:51:55,796 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 04:51:55,797 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6af9be8-f306-4156-ade8-a271a3411011/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 04:51:55,802 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6af9be8-f306-4156-ade8-a271a3411011/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 04:51:55,829 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6af9be8-f306-4156-ade8-a271a3411011/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-11-19 04:51:55,900 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 04:51:55,902 INFO L262 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 12 conjunts are in the unsatisfiable core [2023-11-19 04:51:55,904 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 04:51:55,941 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2023-11-19 04:51:55,942 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 04:51:56,214 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2023-11-19 04:51:56,215 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1498433405] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 04:51:56,216 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1473723392] [2023-11-19 04:51:56,220 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2023-11-19 04:51:56,220 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 04:51:56,221 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 04:51:56,221 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 04:51:56,221 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 04:51:56,414 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-19 04:51:56,575 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '911#(and (<= 1 |#StackHeapBarrier|) (<= 2 |ULTIMATE.start_main_~#A~0#1.base|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= |ULTIMATE.start_main_~#A~0#1.offset| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#A~0#1.base|) (* |ULTIMATE.start_main_~i~0#1| 4)) 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0) (<= 1025 |ULTIMATE.start_main_~i~0#1|))' at error location [2023-11-19 04:51:56,576 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-19 04:51:56,576 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-19 04:51:56,576 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 24 [2023-11-19 04:51:56,576 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1560741560] [2023-11-19 04:51:56,576 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-19 04:51:56,577 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2023-11-19 04:51:56,577 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 04:51:56,578 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2023-11-19 04:51:56,579 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=317, Invalid=553, Unknown=0, NotChecked=0, Total=870 [2023-11-19 04:51:56,579 INFO L87 Difference]: Start difference. First operand 26 states and 27 transitions. Second operand has 25 states, 25 states have (on average 1.28) internal successors, (32), 24 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 04:51:56,839 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 04:51:56,839 INFO L93 Difference]: Finished difference Result 160 states and 173 transitions. [2023-11-19 04:51:56,840 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2023-11-19 04:51:56,840 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 1.28) internal successors, (32), 24 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 25 [2023-11-19 04:51:56,840 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 04:51:56,842 INFO L225 Difference]: With dead ends: 160 [2023-11-19 04:51:56,842 INFO L226 Difference]: Without dead ends: 146 [2023-11-19 04:51:56,843 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 57 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 206 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=317, Invalid=553, Unknown=0, NotChecked=0, Total=870 [2023-11-19 04:51:56,845 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 231 mSDsluCounter, 57 mSDsCounter, 0 mSdLazyCounter, 94 mSolverCounterSat, 60 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 231 SdHoareTripleChecker+Valid, 60 SdHoareTripleChecker+Invalid, 154 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 60 IncrementalHoareTripleChecker+Valid, 94 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-19 04:51:56,845 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [231 Valid, 60 Invalid, 154 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [60 Valid, 94 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-19 04:51:56,846 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 146 states. [2023-11-19 04:51:56,858 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 146 to 38. [2023-11-19 04:51:56,859 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38 states, 37 states have (on average 1.054054054054054) internal successors, (39), 37 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 04:51:56,859 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 39 transitions. [2023-11-19 04:51:56,860 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 39 transitions. Word has length 25 [2023-11-19 04:51:56,860 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 04:51:56,860 INFO L495 AbstractCegarLoop]: Abstraction has 38 states and 39 transitions. [2023-11-19 04:51:56,860 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 1.28) internal successors, (32), 24 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 04:51:56,861 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 39 transitions. [2023-11-19 04:51:56,862 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2023-11-19 04:51:56,862 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 04:51:56,862 INFO L195 NwaCegarLoop]: trace histogram [22, 5, 4, 1, 1, 1, 1, 1, 1] [2023-11-19 04:51:56,893 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6af9be8-f306-4156-ade8-a271a3411011/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-11-19 04:51:57,081 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6af9be8-f306-4156-ade8-a271a3411011/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 04:51:57,081 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 04:51:57,082 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 04:51:57,082 INFO L85 PathProgramCache]: Analyzing trace with hash -495149787, now seen corresponding path program 5 times [2023-11-19 04:51:57,082 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 04:51:57,082 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1427582951] [2023-11-19 04:51:57,082 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 04:51:57,082 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 04:51:57,148 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 04:51:57,820 INFO L134 CoverageAnalysis]: Checked inductivity of 273 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2023-11-19 04:51:57,820 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 04:51:57,820 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1427582951] [2023-11-19 04:51:57,821 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1427582951] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 04:51:57,821 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [632432263] [2023-11-19 04:51:57,821 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-19 04:51:57,821 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 04:51:57,821 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6af9be8-f306-4156-ade8-a271a3411011/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 04:51:57,825 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6af9be8-f306-4156-ade8-a271a3411011/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 04:51:57,849 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6af9be8-f306-4156-ade8-a271a3411011/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-11-19 04:51:57,973 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2023-11-19 04:51:57,973 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-19 04:51:57,975 INFO L262 TraceCheckSpWp]: Trace formula consists of 141 conjuncts, 8 conjunts are in the unsatisfiable core [2023-11-19 04:51:57,977 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 04:51:58,019 INFO L134 CoverageAnalysis]: Checked inductivity of 273 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2023-11-19 04:51:58,020 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 04:51:58,211 INFO L134 CoverageAnalysis]: Checked inductivity of 273 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2023-11-19 04:51:58,211 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [632432263] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 04:51:58,211 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [937671566] [2023-11-19 04:51:58,213 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2023-11-19 04:51:58,213 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 04:51:58,214 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 04:51:58,214 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 04:51:58,214 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 04:51:58,370 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-19 04:51:58,577 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1441#(and (<= 1 |#StackHeapBarrier|) (<= 2 |ULTIMATE.start_main_~#A~0#1.base|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= |ULTIMATE.start_main_~#A~0#1.offset| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#A~0#1.base|) (* |ULTIMATE.start_main_~i~0#1| 4)) 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0) (<= 1025 |ULTIMATE.start_main_~i~0#1|))' at error location [2023-11-19 04:51:58,577 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-19 04:51:58,578 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-19 04:51:58,578 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 8, 8] total 32 [2023-11-19 04:51:58,578 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [468334645] [2023-11-19 04:51:58,578 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-19 04:51:58,579 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2023-11-19 04:51:58,579 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 04:51:58,580 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2023-11-19 04:51:58,581 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=484, Invalid=848, Unknown=0, NotChecked=0, Total=1332 [2023-11-19 04:51:58,581 INFO L87 Difference]: Start difference. First operand 38 states and 39 transitions. Second operand has 32 states, 32 states have (on average 1.78125) internal successors, (57), 32 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 04:51:59,370 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 04:51:59,370 INFO L93 Difference]: Finished difference Result 152 states and 181 transitions. [2023-11-19 04:51:59,370 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2023-11-19 04:51:59,371 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 1.78125) internal successors, (57), 32 states have internal predecessors, (57), 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 37 [2023-11-19 04:51:59,371 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 04:51:59,372 INFO L225 Difference]: With dead ends: 152 [2023-11-19 04:51:59,372 INFO L226 Difference]: Without dead ends: 90 [2023-11-19 04:51:59,374 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 157 GetRequests, 97 SyntacticMatches, 1 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 644 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=1132, Invalid=2528, Unknown=0, NotChecked=0, Total=3660 [2023-11-19 04:51:59,375 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 155 mSDsluCounter, 37 mSDsCounter, 0 mSdLazyCounter, 120 mSolverCounterSat, 57 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 155 SdHoareTripleChecker+Valid, 40 SdHoareTripleChecker+Invalid, 177 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 57 IncrementalHoareTripleChecker+Valid, 120 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-19 04:51:59,375 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [155 Valid, 40 Invalid, 177 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [57 Valid, 120 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-19 04:51:59,376 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2023-11-19 04:51:59,407 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 90. [2023-11-19 04:51:59,408 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 90 states, 89 states have (on average 1.0224719101123596) internal successors, (91), 89 states have internal predecessors, (91), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 04:51:59,409 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 91 transitions. [2023-11-19 04:51:59,409 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 91 transitions. Word has length 37 [2023-11-19 04:51:59,410 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 04:51:59,410 INFO L495 AbstractCegarLoop]: Abstraction has 90 states and 91 transitions. [2023-11-19 04:51:59,410 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 1.78125) internal successors, (57), 32 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 04:51:59,410 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 91 transitions. [2023-11-19 04:51:59,413 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2023-11-19 04:51:59,414 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 04:51:59,414 INFO L195 NwaCegarLoop]: trace histogram [29, 28, 26, 1, 1, 1, 1, 1, 1] [2023-11-19 04:51:59,437 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6af9be8-f306-4156-ade8-a271a3411011/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2023-11-19 04:51:59,629 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6af9be8-f306-4156-ade8-a271a3411011/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 04:51:59,629 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 04:51:59,630 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 04:51:59,630 INFO L85 PathProgramCache]: Analyzing trace with hash 216908909, now seen corresponding path program 6 times [2023-11-19 04:51:59,630 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 04:51:59,630 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [985215573] [2023-11-19 04:51:59,630 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 04:51:59,630 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 04:51:59,712 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 04:52:00,882 INFO L134 CoverageAnalysis]: Checked inductivity of 1163 backedges. 0 proven. 351 refuted. 0 times theorem prover too weak. 812 trivial. 0 not checked. [2023-11-19 04:52:00,883 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 04:52:00,883 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [985215573] [2023-11-19 04:52:00,883 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [985215573] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 04:52:00,884 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1724887071] [2023-11-19 04:52:00,884 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-11-19 04:52:00,884 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 04:52:00,884 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6af9be8-f306-4156-ade8-a271a3411011/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 04:52:00,885 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6af9be8-f306-4156-ade8-a271a3411011/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 04:52:00,901 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6af9be8-f306-4156-ade8-a271a3411011/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-11-19 04:52:01,080 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-11-19 04:52:01,081 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-19 04:52:01,084 INFO L262 TraceCheckSpWp]: Trace formula consists of 423 conjuncts, 28 conjunts are in the unsatisfiable core [2023-11-19 04:52:01,090 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 04:52:01,166 INFO L134 CoverageAnalysis]: Checked inductivity of 1163 backedges. 0 proven. 351 refuted. 0 times theorem prover too weak. 812 trivial. 0 not checked. [2023-11-19 04:52:01,167 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 04:52:02,391 INFO L134 CoverageAnalysis]: Checked inductivity of 1163 backedges. 0 proven. 351 refuted. 0 times theorem prover too weak. 812 trivial. 0 not checked. [2023-11-19 04:52:02,392 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1724887071] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 04:52:02,392 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [292843162] [2023-11-19 04:52:02,394 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2023-11-19 04:52:02,394 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 04:52:02,395 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 04:52:02,395 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 04:52:02,395 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 04:52:02,615 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-19 04:52:02,835 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2438#(and (<= 1 |#StackHeapBarrier|) (<= 2 |ULTIMATE.start_main_~#A~0#1.base|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= |ULTIMATE.start_main_~#A~0#1.offset| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#A~0#1.base|) (* |ULTIMATE.start_main_~i~0#1| 4)) 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0) (<= 1025 |ULTIMATE.start_main_~i~0#1|))' at error location [2023-11-19 04:52:02,835 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-19 04:52:02,835 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-19 04:52:02,836 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28] total 56 [2023-11-19 04:52:02,836 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2099077133] [2023-11-19 04:52:02,836 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-19 04:52:02,837 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 57 states [2023-11-19 04:52:02,837 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 04:52:02,839 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2023-11-19 04:52:02,841 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1613, Invalid=2169, Unknown=0, NotChecked=0, Total=3782 [2023-11-19 04:52:02,842 INFO L87 Difference]: Start difference. First operand 90 states and 91 transitions. Second operand has 57 states, 57 states have (on average 1.1228070175438596) internal successors, (64), 56 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 04:52:03,438 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 04:52:03,438 INFO L93 Difference]: Finished difference Result 336 states and 365 transitions. [2023-11-19 04:52:03,438 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2023-11-19 04:52:03,439 INFO L78 Accepts]: Start accepts. Automaton has has 57 states, 57 states have (on average 1.1228070175438596) internal successors, (64), 56 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 89 [2023-11-19 04:52:03,439 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 04:52:03,441 INFO L225 Difference]: With dead ends: 336 [2023-11-19 04:52:03,441 INFO L226 Difference]: Without dead ends: 274 [2023-11-19 04:52:03,443 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 293 GetRequests, 233 SyntacticMatches, 0 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 510 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=1613, Invalid=2169, Unknown=0, NotChecked=0, Total=3782 [2023-11-19 04:52:03,444 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 432 mSDsluCounter, 96 mSDsCounter, 0 mSdLazyCounter, 203 mSolverCounterSat, 153 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 432 SdHoareTripleChecker+Valid, 99 SdHoareTripleChecker+Invalid, 356 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 153 IncrementalHoareTripleChecker+Valid, 203 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-11-19 04:52:03,445 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [432 Valid, 99 Invalid, 356 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [153 Valid, 203 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-11-19 04:52:03,445 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 274 states. [2023-11-19 04:52:03,479 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 274 to 118. [2023-11-19 04:52:03,479 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 118 states, 117 states have (on average 1.017094017094017) internal successors, (119), 117 states have internal predecessors, (119), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 04:52:03,481 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 118 states to 118 states and 119 transitions. [2023-11-19 04:52:03,481 INFO L78 Accepts]: Start accepts. Automaton has 118 states and 119 transitions. Word has length 89 [2023-11-19 04:52:03,481 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 04:52:03,481 INFO L495 AbstractCegarLoop]: Abstraction has 118 states and 119 transitions. [2023-11-19 04:52:03,482 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 57 states, 57 states have (on average 1.1228070175438596) internal successors, (64), 56 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 04:52:03,482 INFO L276 IsEmpty]: Start isEmpty. Operand 118 states and 119 transitions. [2023-11-19 04:52:03,483 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2023-11-19 04:52:03,484 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 04:52:03,484 INFO L195 NwaCegarLoop]: trace histogram [54, 29, 28, 1, 1, 1, 1, 1, 1] [2023-11-19 04:52:03,510 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6af9be8-f306-4156-ade8-a271a3411011/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2023-11-19 04:52:03,697 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6af9be8-f306-4156-ade8-a271a3411011/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 04:52:03,698 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 04:52:03,698 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 04:52:03,698 INFO L85 PathProgramCache]: Analyzing trace with hash 1998833773, now seen corresponding path program 7 times [2023-11-19 04:52:03,698 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 04:52:03,698 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1438233992] [2023-11-19 04:52:03,698 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 04:52:03,699 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 04:52:03,831 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 04:52:06,930 INFO L134 CoverageAnalysis]: Checked inductivity of 2297 backedges. 0 proven. 1485 refuted. 0 times theorem prover too weak. 812 trivial. 0 not checked. [2023-11-19 04:52:06,930 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 04:52:06,930 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1438233992] [2023-11-19 04:52:06,930 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1438233992] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 04:52:06,930 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1695932839] [2023-11-19 04:52:06,931 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-11-19 04:52:06,931 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 04:52:06,931 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6af9be8-f306-4156-ade8-a271a3411011/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 04:52:06,932 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6af9be8-f306-4156-ade8-a271a3411011/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 04:52:06,965 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6af9be8-f306-4156-ade8-a271a3411011/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-11-19 04:52:07,198 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 04:52:07,203 INFO L262 TraceCheckSpWp]: Trace formula consists of 675 conjuncts, 56 conjunts are in the unsatisfiable core [2023-11-19 04:52:07,210 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 04:52:07,336 INFO L134 CoverageAnalysis]: Checked inductivity of 2297 backedges. 0 proven. 1485 refuted. 0 times theorem prover too weak. 812 trivial. 0 not checked. [2023-11-19 04:52:07,337 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 04:52:11,661 INFO L134 CoverageAnalysis]: Checked inductivity of 2297 backedges. 0 proven. 1485 refuted. 0 times theorem prover too weak. 812 trivial. 0 not checked. [2023-11-19 04:52:11,661 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1695932839] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 04:52:11,661 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1052102729] [2023-11-19 04:52:11,663 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2023-11-19 04:52:11,664 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 04:52:11,664 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 04:52:11,664 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 04:52:11,664 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 04:52:11,836 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-19 04:52:12,140 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3929#(and (<= 1 |#StackHeapBarrier|) (<= 2 |ULTIMATE.start_main_~#A~0#1.base|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= |ULTIMATE.start_main_~#A~0#1.offset| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#A~0#1.base|) (* |ULTIMATE.start_main_~i~0#1| 4)) 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0) (<= 1025 |ULTIMATE.start_main_~i~0#1|))' at error location [2023-11-19 04:52:12,140 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-19 04:52:12,140 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-19 04:52:12,140 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [56, 56, 56] total 112 [2023-11-19 04:52:12,141 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [261179799] [2023-11-19 04:52:12,141 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-19 04:52:12,142 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 113 states [2023-11-19 04:52:12,142 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 04:52:12,145 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 113 interpolants. [2023-11-19 04:52:12,171 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6345, Invalid=7461, Unknown=0, NotChecked=0, Total=13806 [2023-11-19 04:52:12,174 INFO L87 Difference]: Start difference. First operand 118 states and 119 transitions. Second operand has 113 states, 113 states have (on average 1.0619469026548674) internal successors, (120), 112 states have internal predecessors, (120), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 04:52:15,417 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 04:52:15,418 INFO L93 Difference]: Finished difference Result 728 states and 785 transitions. [2023-11-19 04:52:15,418 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 112 states. [2023-11-19 04:52:15,418 INFO L78 Accepts]: Start accepts. Automaton has has 113 states, 113 states have (on average 1.0619469026548674) internal successors, (120), 112 states have internal predecessors, (120), 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 117 [2023-11-19 04:52:15,419 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 04:52:15,422 INFO L225 Difference]: With dead ends: 728 [2023-11-19 04:52:15,423 INFO L226 Difference]: Without dead ends: 666 [2023-11-19 04:52:15,428 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 405 GetRequests, 289 SyntacticMatches, 0 SemanticMatches, 116 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1042 ImplicationChecksByTransitivity, 5.9s TimeCoverageRelationStatistics Valid=6345, Invalid=7461, Unknown=0, NotChecked=0, Total=13806 [2023-11-19 04:52:15,428 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 1963 mSDsluCounter, 255 mSDsCounter, 0 mSdLazyCounter, 424 mSolverCounterSat, 536 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1963 SdHoareTripleChecker+Valid, 258 SdHoareTripleChecker+Invalid, 960 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 536 IncrementalHoareTripleChecker+Valid, 424 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2023-11-19 04:52:15,429 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1963 Valid, 258 Invalid, 960 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [536 Valid, 424 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2023-11-19 04:52:15,430 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 666 states. [2023-11-19 04:52:15,484 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 666 to 174. [2023-11-19 04:52:15,484 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 174 states, 173 states have (on average 1.0115606936416186) internal successors, (175), 173 states have internal predecessors, (175), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 04:52:15,489 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 174 states to 174 states and 175 transitions. [2023-11-19 04:52:15,491 INFO L78 Accepts]: Start accepts. Automaton has 174 states and 175 transitions. Word has length 117 [2023-11-19 04:52:15,491 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 04:52:15,491 INFO L495 AbstractCegarLoop]: Abstraction has 174 states and 175 transitions. [2023-11-19 04:52:15,492 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 113 states, 113 states have (on average 1.0619469026548674) internal successors, (120), 112 states have internal predecessors, (120), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 04:52:15,492 INFO L276 IsEmpty]: Start isEmpty. Operand 174 states and 175 transitions. [2023-11-19 04:52:15,495 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 174 [2023-11-19 04:52:15,495 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 04:52:15,495 INFO L195 NwaCegarLoop]: trace histogram [110, 29, 28, 1, 1, 1, 1, 1, 1] [2023-11-19 04:52:15,512 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6af9be8-f306-4156-ade8-a271a3411011/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2023-11-19 04:52:15,705 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6af9be8-f306-4156-ade8-a271a3411011/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2023-11-19 04:52:15,705 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 04:52:15,706 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 04:52:15,706 INFO L85 PathProgramCache]: Analyzing trace with hash -196751251, now seen corresponding path program 8 times [2023-11-19 04:52:15,706 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 04:52:15,707 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [255319070] [2023-11-19 04:52:15,707 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 04:52:15,707 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 04:52:15,913 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 04:52:25,214 INFO L134 CoverageAnalysis]: Checked inductivity of 6917 backedges. 0 proven. 6105 refuted. 0 times theorem prover too weak. 812 trivial. 0 not checked. [2023-11-19 04:52:25,214 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 04:52:25,214 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [255319070] [2023-11-19 04:52:25,214 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [255319070] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 04:52:25,214 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2123403084] [2023-11-19 04:52:25,215 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-19 04:52:25,215 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 04:52:25,215 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6af9be8-f306-4156-ade8-a271a3411011/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 04:52:25,216 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6af9be8-f306-4156-ade8-a271a3411011/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 04:52:25,220 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6af9be8-f306-4156-ade8-a271a3411011/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process