./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/product-lines/elevator_spec13_product31.cil.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 9bd2c7ff Calling Ultimate with: /usr/lib/jvm/java-11-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25db2b55-aa14-44a1-92ce-3befb4013adf/bin/utaipan-verify-t7M7D8N6sZ/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25db2b55-aa14-44a1-92ce-3befb4013adf/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_25db2b55-aa14-44a1-92ce-3befb4013adf/bin/utaipan-verify-t7M7D8N6sZ/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25db2b55-aa14-44a1-92ce-3befb4013adf/bin/utaipan-verify-t7M7D8N6sZ/config/TaipanReach.xml -i ../../sv-benchmarks/c/product-lines/elevator_spec13_product31.cil.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25db2b55-aa14-44a1-92ce-3befb4013adf/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_25db2b55-aa14-44a1-92ce-3befb4013adf/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 2e77838346608929bef5ad1e655ea0710d74ebb9f10b29169ab985d305812d92 --- Real Ultimate output --- This is Ultimate 0.2.3-dev-9bd2c7f [2023-11-19 05:14:08,618 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-19 05:14:08,717 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25db2b55-aa14-44a1-92ce-3befb4013adf/bin/utaipan-verify-t7M7D8N6sZ/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-11-19 05:14:08,725 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-19 05:14:08,725 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-19 05:14:08,766 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-19 05:14:08,767 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-19 05:14:08,768 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-19 05:14:08,769 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-19 05:14:08,770 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-19 05:14:08,771 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-19 05:14:08,771 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-19 05:14:08,772 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-19 05:14:08,773 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-19 05:14:08,774 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-19 05:14:08,774 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-19 05:14:08,775 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-19 05:14:08,776 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-19 05:14:08,776 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-19 05:14:08,777 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-19 05:14:08,778 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-19 05:14:08,778 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-19 05:14:08,779 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-19 05:14:08,780 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-11-19 05:14:08,780 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-19 05:14:08,781 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-19 05:14:08,782 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-19 05:14:08,782 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-19 05:14:08,783 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-11-19 05:14:08,783 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-19 05:14:08,784 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-11-19 05:14:08,784 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-19 05:14:08,785 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-11-19 05:14:08,786 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-19 05:14:08,786 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-19 05:14:08,787 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-19 05:14:08,787 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-19 05:14:08,788 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-19 05:14:08,788 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-19 05:14:08,788 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-11-19 05:14:08,788 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-19 05:14:08,789 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-19 05:14:08,789 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-11-19 05:14:08,789 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-19 05:14:08,790 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-19 05:14:08,790 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_25db2b55-aa14-44a1-92ce-3befb4013adf/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25db2b55-aa14-44a1-92ce-3befb4013adf/bin/utaipan-verify-t7M7D8N6sZ Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 2e77838346608929bef5ad1e655ea0710d74ebb9f10b29169ab985d305812d92 [2023-11-19 05:14:09,181 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-19 05:14:09,217 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-19 05:14:09,221 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-19 05:14:09,222 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-19 05:14:09,229 INFO L274 PluginConnector]: CDTParser initialized [2023-11-19 05:14:09,233 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25db2b55-aa14-44a1-92ce-3befb4013adf/bin/utaipan-verify-t7M7D8N6sZ/../../sv-benchmarks/c/product-lines/elevator_spec13_product31.cil.c [2023-11-19 05:14:13,139 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-19 05:14:13,560 INFO L384 CDTParser]: Found 1 translation units. [2023-11-19 05:14:13,561 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25db2b55-aa14-44a1-92ce-3befb4013adf/sv-benchmarks/c/product-lines/elevator_spec13_product31.cil.c [2023-11-19 05:14:13,604 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25db2b55-aa14-44a1-92ce-3befb4013adf/bin/utaipan-verify-t7M7D8N6sZ/data/6c084b23c/d81bab5214e8473db1f08eec24ff0434/FLAGd4c832a2c [2023-11-19 05:14:13,618 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25db2b55-aa14-44a1-92ce-3befb4013adf/bin/utaipan-verify-t7M7D8N6sZ/data/6c084b23c/d81bab5214e8473db1f08eec24ff0434 [2023-11-19 05:14:13,621 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-19 05:14:13,623 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-19 05:14:13,625 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-19 05:14:13,625 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-19 05:14:13,632 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-19 05:14:13,633 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 05:14:13" (1/1) ... [2023-11-19 05:14:13,634 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@273d9590 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:14:13, skipping insertion in model container [2023-11-19 05:14:13,634 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 05:14:13" (1/1) ... [2023-11-19 05:14:13,760 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-19 05:14:14,010 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_25db2b55-aa14-44a1-92ce-3befb4013adf/sv-benchmarks/c/product-lines/elevator_spec13_product31.cil.c[1546,1559] [2023-11-19 05:14:14,610 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-19 05:14:14,628 INFO L202 MainTranslator]: Completed pre-run [2023-11-19 05:14:14,642 WARN L75 lationResultReporter]: Unsoundness Warning: Ignoring preprocessor pragma C: #pragma merger(0,"wsllib_check.i","") [48] [2023-11-19 05:14:14,644 WARN L75 lationResultReporter]: Unsoundness Warning: Ignoring preprocessor pragma C: #pragma merger(0,"libacc.i","") [57] [2023-11-19 05:14:14,645 WARN L75 lationResultReporter]: Unsoundness Warning: Ignoring preprocessor pragma C: #pragma merger(0,"Specification13_spec.i","") [423] [2023-11-19 05:14:14,645 WARN L75 lationResultReporter]: Unsoundness Warning: Ignoring preprocessor pragma C: #pragma merger(0,"Person.i","") [517] [2023-11-19 05:14:14,645 WARN L75 lationResultReporter]: Unsoundness Warning: Ignoring preprocessor pragma C: #pragma merger(0,"Floor.i","") [638] [2023-11-19 05:14:14,647 WARN L75 lationResultReporter]: Unsoundness Warning: Ignoring preprocessor pragma C: #pragma merger(0,"Test.i","") [1306] [2023-11-19 05:14:14,672 WARN L75 lationResultReporter]: Unsoundness Warning: Ignoring preprocessor pragma C: #pragma merger(0,"scenario.i","") [1664] [2023-11-19 05:14:14,673 WARN L75 lationResultReporter]: Unsoundness Warning: Ignoring preprocessor pragma C: #pragma merger(0,"featureselect.i","") [1679] [2023-11-19 05:14:14,678 WARN L75 lationResultReporter]: Unsoundness Warning: Ignoring preprocessor pragma C: #pragma merger(0,"Elevator.i","") [1714] [2023-11-19 05:14:14,684 WARN L75 lationResultReporter]: Unsoundness Warning: Ignoring preprocessor pragma C: #pragma merger(0,"UnitTests.i","") [3329] [2023-11-19 05:14:14,691 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_25db2b55-aa14-44a1-92ce-3befb4013adf/sv-benchmarks/c/product-lines/elevator_spec13_product31.cil.c[1546,1559] [2023-11-19 05:14:14,939 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-19 05:14:15,004 INFO L206 MainTranslator]: Completed translation [2023-11-19 05:14:15,005 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:14:15 WrapperNode [2023-11-19 05:14:15,005 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-19 05:14:15,007 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-19 05:14:15,007 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-19 05:14:15,008 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-19 05:14:15,017 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:14:15" (1/1) ... [2023-11-19 05:14:15,071 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:14:15" (1/1) ... [2023-11-19 05:14:15,146 INFO L138 Inliner]: procedures = 95, calls = 348, calls flagged for inlining = 28, calls inlined = 25, statements flattened = 916 [2023-11-19 05:14:15,147 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-19 05:14:15,148 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-19 05:14:15,148 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-19 05:14:15,148 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-19 05:14:15,162 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:14:15" (1/1) ... [2023-11-19 05:14:15,162 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:14:15" (1/1) ... [2023-11-19 05:14:15,178 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:14:15" (1/1) ... [2023-11-19 05:14:15,180 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:14:15" (1/1) ... [2023-11-19 05:14:15,218 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:14:15" (1/1) ... [2023-11-19 05:14:15,236 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:14:15" (1/1) ... [2023-11-19 05:14:15,242 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:14:15" (1/1) ... [2023-11-19 05:14:15,249 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:14:15" (1/1) ... [2023-11-19 05:14:15,260 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-19 05:14:15,261 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-19 05:14:15,261 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-19 05:14:15,262 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-19 05:14:15,262 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:14:15" (1/1) ... [2023-11-19 05:14:15,269 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-19 05:14:15,288 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25db2b55-aa14-44a1-92ce-3befb4013adf/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:14:15,305 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25db2b55-aa14-44a1-92ce-3befb4013adf/bin/utaipan-verify-t7M7D8N6sZ/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-19 05:14:15,337 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25db2b55-aa14-44a1-92ce-3befb4013adf/bin/utaipan-verify-t7M7D8N6sZ/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-19 05:14:15,380 INFO L130 BoogieDeclarations]: Found specification of procedure angelinaCall [2023-11-19 05:14:15,381 INFO L138 BoogieDeclarations]: Found implementation of procedure angelinaCall [2023-11-19 05:14:15,381 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-19 05:14:15,381 INFO L130 BoogieDeclarations]: Found specification of procedure stopRequestedAtCurrentFloor__wrappee__twothirdsfull [2023-11-19 05:14:15,381 INFO L138 BoogieDeclarations]: Found implementation of procedure stopRequestedAtCurrentFloor__wrappee__twothirdsfull [2023-11-19 05:14:15,382 INFO L130 BoogieDeclarations]: Found specification of procedure getCurrentHeading [2023-11-19 05:14:15,382 INFO L138 BoogieDeclarations]: Found implementation of procedure getCurrentHeading [2023-11-19 05:14:15,382 INFO L130 BoogieDeclarations]: Found specification of procedure getWeight [2023-11-19 05:14:15,382 INFO L138 BoogieDeclarations]: Found implementation of procedure getWeight [2023-11-19 05:14:15,382 INFO L130 BoogieDeclarations]: Found specification of procedure existInLiftCallsInDirection [2023-11-19 05:14:15,383 INFO L138 BoogieDeclarations]: Found implementation of procedure existInLiftCallsInDirection [2023-11-19 05:14:15,383 INFO L130 BoogieDeclarations]: Found specification of procedure enterElevator [2023-11-19 05:14:15,383 INFO L138 BoogieDeclarations]: Found implementation of procedure enterElevator [2023-11-19 05:14:15,383 INFO L130 BoogieDeclarations]: Found specification of procedure isExecutiveFloorCalling [2023-11-19 05:14:15,383 INFO L138 BoogieDeclarations]: Found implementation of procedure isExecutiveFloorCalling [2023-11-19 05:14:15,384 INFO L130 BoogieDeclarations]: Found specification of procedure stopRequestedInDirection [2023-11-19 05:14:15,384 INFO L138 BoogieDeclarations]: Found implementation of procedure stopRequestedInDirection [2023-11-19 05:14:15,384 INFO L130 BoogieDeclarations]: Found specification of procedure bobCall [2023-11-19 05:14:15,384 INFO L138 BoogieDeclarations]: Found implementation of procedure bobCall [2023-11-19 05:14:15,384 INFO L130 BoogieDeclarations]: Found specification of procedure getReverseHeading [2023-11-19 05:14:15,385 INFO L138 BoogieDeclarations]: Found implementation of procedure getReverseHeading [2023-11-19 05:14:15,385 INFO L130 BoogieDeclarations]: Found specification of procedure stopRequestedInDirection__wrappee__empty [2023-11-19 05:14:15,385 INFO L138 BoogieDeclarations]: Found implementation of procedure stopRequestedInDirection__wrappee__empty [2023-11-19 05:14:15,385 INFO L130 BoogieDeclarations]: Found specification of procedure cleanup [2023-11-19 05:14:15,385 INFO L138 BoogieDeclarations]: Found implementation of procedure cleanup [2023-11-19 05:14:15,386 INFO L130 BoogieDeclarations]: Found specification of procedure timeShift [2023-11-19 05:14:15,386 INFO L138 BoogieDeclarations]: Found implementation of procedure timeShift [2023-11-19 05:14:15,386 INFO L130 BoogieDeclarations]: Found specification of procedure __automaton_fail [2023-11-19 05:14:15,386 INFO L138 BoogieDeclarations]: Found implementation of procedure __automaton_fail [2023-11-19 05:14:15,386 INFO L130 BoogieDeclarations]: Found specification of procedure isTopFloor [2023-11-19 05:14:15,387 INFO L138 BoogieDeclarations]: Found implementation of procedure isTopFloor [2023-11-19 05:14:15,387 INFO L130 BoogieDeclarations]: Found specification of procedure getDestination [2023-11-19 05:14:15,387 INFO L138 BoogieDeclarations]: Found implementation of procedure getDestination [2023-11-19 05:14:15,387 INFO L130 BoogieDeclarations]: Found specification of procedure isBlocked [2023-11-19 05:14:15,387 INFO L138 BoogieDeclarations]: Found implementation of procedure isBlocked [2023-11-19 05:14:15,387 INFO L130 BoogieDeclarations]: Found specification of procedure getCurrentFloorID [2023-11-19 05:14:15,388 INFO L138 BoogieDeclarations]: Found implementation of procedure getCurrentFloorID [2023-11-19 05:14:15,388 INFO L130 BoogieDeclarations]: Found specification of procedure resetCallOnFloor [2023-11-19 05:14:15,388 INFO L138 BoogieDeclarations]: Found implementation of procedure resetCallOnFloor [2023-11-19 05:14:15,388 INFO L130 BoogieDeclarations]: Found specification of procedure initPersonOnFloor [2023-11-19 05:14:15,388 INFO L138 BoogieDeclarations]: Found implementation of procedure initPersonOnFloor [2023-11-19 05:14:15,389 INFO L130 BoogieDeclarations]: Found specification of procedure removePersonFromFloor [2023-11-19 05:14:15,389 INFO L138 BoogieDeclarations]: Found implementation of procedure removePersonFromFloor [2023-11-19 05:14:15,389 INFO L130 BoogieDeclarations]: Found specification of procedure getOrigin [2023-11-19 05:14:15,389 INFO L138 BoogieDeclarations]: Found implementation of procedure getOrigin [2023-11-19 05:14:15,390 INFO L130 BoogieDeclarations]: Found specification of procedure continueInDirection [2023-11-19 05:14:15,390 INFO L138 BoogieDeclarations]: Found implementation of procedure continueInDirection [2023-11-19 05:14:15,390 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-19 05:14:15,390 INFO L130 BoogieDeclarations]: Found specification of procedure buttonForFloorIsPressed [2023-11-19 05:14:15,390 INFO L138 BoogieDeclarations]: Found implementation of procedure buttonForFloorIsPressed [2023-11-19 05:14:15,390 INFO L130 BoogieDeclarations]: Found specification of procedure pressInLiftFloorButton [2023-11-19 05:14:15,391 INFO L138 BoogieDeclarations]: Found implementation of procedure pressInLiftFloorButton [2023-11-19 05:14:15,391 INFO L130 BoogieDeclarations]: Found specification of procedure leaveElevator [2023-11-19 05:14:15,391 INFO L138 BoogieDeclarations]: Found implementation of procedure leaveElevator [2023-11-19 05:14:15,391 INFO L130 BoogieDeclarations]: Found specification of procedure isPersonOnFloor [2023-11-19 05:14:15,391 INFO L138 BoogieDeclarations]: Found implementation of procedure isPersonOnFloor [2023-11-19 05:14:15,391 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-19 05:14:15,392 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-19 05:14:15,392 INFO L130 BoogieDeclarations]: Found specification of procedure isFloorCalling [2023-11-19 05:14:15,392 INFO L138 BoogieDeclarations]: Found implementation of procedure isFloorCalling [2023-11-19 05:14:15,632 INFO L236 CfgBuilder]: Building ICFG [2023-11-19 05:14:15,636 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-19 05:14:17,310 INFO L277 CfgBuilder]: Performing block encoding [2023-11-19 05:14:18,573 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-19 05:14:18,574 INFO L302 CfgBuilder]: Removed 4 assume(true) statements. [2023-11-19 05:14:18,594 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 05:14:18 BoogieIcfgContainer [2023-11-19 05:14:18,594 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-19 05:14:18,600 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-19 05:14:18,600 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-19 05:14:18,605 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-19 05:14:18,606 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 19.11 05:14:13" (1/3) ... [2023-11-19 05:14:18,609 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@464bfe77 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 05:14:18, skipping insertion in model container [2023-11-19 05:14:18,610 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:14:15" (2/3) ... [2023-11-19 05:14:18,611 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@464bfe77 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 05:14:18, skipping insertion in model container [2023-11-19 05:14:18,611 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 05:14:18" (3/3) ... [2023-11-19 05:14:18,616 INFO L112 eAbstractionObserver]: Analyzing ICFG elevator_spec13_product31.cil.c [2023-11-19 05:14:18,643 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-19 05:14:18,644 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-11-19 05:14:18,759 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-19 05:14:18,769 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;@2927a2e8, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-19 05:14:18,770 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-11-19 05:14:18,782 INFO L276 IsEmpty]: Start isEmpty. Operand has 436 states, 298 states have (on average 1.5771812080536913) internal successors, (470), 316 states have internal predecessors, (470), 108 states have call successors, (108), 28 states have call predecessors, (108), 28 states have return successors, (108), 105 states have call predecessors, (108), 108 states have call successors, (108) [2023-11-19 05:14:18,845 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2023-11-19 05:14:18,846 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:14:18,849 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:14:18,851 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:14:18,861 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:14:18,862 INFO L85 PathProgramCache]: Analyzing trace with hash 269500351, now seen corresponding path program 1 times [2023-11-19 05:14:18,876 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:14:18,876 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1963981964] [2023-11-19 05:14:18,877 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:14:18,878 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:14:19,334 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:14:20,174 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2023-11-19 05:14:20,175 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:14:20,176 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1963981964] [2023-11-19 05:14:20,177 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1963981964] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 05:14:20,177 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [621024099] [2023-11-19 05:14:20,177 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:14:20,178 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:14:20,178 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25db2b55-aa14-44a1-92ce-3befb4013adf/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:14:20,180 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25db2b55-aa14-44a1-92ce-3befb4013adf/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:14:20,190 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25db2b55-aa14-44a1-92ce-3befb4013adf/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-19 05:14:20,650 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:14:20,661 INFO L262 TraceCheckSpWp]: Trace formula consists of 1328 conjuncts, 13 conjunts are in the unsatisfiable core [2023-11-19 05:14:20,677 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:14:20,956 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2023-11-19 05:14:20,957 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-19 05:14:20,957 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [621024099] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 05:14:20,957 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-19 05:14:20,958 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [8] total 9 [2023-11-19 05:14:20,960 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [761705983] [2023-11-19 05:14:20,961 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 05:14:20,967 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-19 05:14:20,967 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:14:21,016 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-19 05:14:21,017 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2023-11-19 05:14:21,022 INFO L87 Difference]: Start difference. First operand has 436 states, 298 states have (on average 1.5771812080536913) internal successors, (470), 316 states have internal predecessors, (470), 108 states have call successors, (108), 28 states have call predecessors, (108), 28 states have return successors, (108), 105 states have call predecessors, (108), 108 states have call successors, (108) Second operand has 5 states, 5 states have (on average 9.8) internal successors, (49), 4 states have internal predecessors, (49), 2 states have call successors, (18), 3 states have call predecessors, (18), 3 states have return successors, (16), 2 states have call predecessors, (16), 2 states have call successors, (16) [2023-11-19 05:14:22,181 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:14:22,182 INFO L93 Difference]: Finished difference Result 1276 states and 2046 transitions. [2023-11-19 05:14:22,184 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-19 05:14:22,185 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 9.8) internal successors, (49), 4 states have internal predecessors, (49), 2 states have call successors, (18), 3 states have call predecessors, (18), 3 states have return successors, (16), 2 states have call predecessors, (16), 2 states have call successors, (16) Word has length 96 [2023-11-19 05:14:22,187 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:14:22,215 INFO L225 Difference]: With dead ends: 1276 [2023-11-19 05:14:22,215 INFO L226 Difference]: Without dead ends: 845 [2023-11-19 05:14:22,232 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 105 GetRequests, 97 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=19, Invalid=71, Unknown=0, NotChecked=0, Total=90 [2023-11-19 05:14:22,239 INFO L413 NwaCegarLoop]: 799 mSDtfsCounter, 618 mSDsluCounter, 2002 mSDsCounter, 0 mSdLazyCounter, 425 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 618 SdHoareTripleChecker+Valid, 2801 SdHoareTripleChecker+Invalid, 438 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 425 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2023-11-19 05:14:22,241 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [618 Valid, 2801 Invalid, 438 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [13 Valid, 425 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2023-11-19 05:14:22,267 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 845 states. [2023-11-19 05:14:22,410 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 845 to 837. [2023-11-19 05:14:22,414 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 837 states, 579 states have (on average 1.5613126079447324) internal successors, (904), 609 states have internal predecessors, (904), 206 states have call successors, (206), 54 states have call predecessors, (206), 51 states have return successors, (210), 198 states have call predecessors, (210), 202 states have call successors, (210) [2023-11-19 05:14:22,433 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 837 states to 837 states and 1320 transitions. [2023-11-19 05:14:22,436 INFO L78 Accepts]: Start accepts. Automaton has 837 states and 1320 transitions. Word has length 96 [2023-11-19 05:14:22,437 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:14:22,437 INFO L495 AbstractCegarLoop]: Abstraction has 837 states and 1320 transitions. [2023-11-19 05:14:22,439 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 9.8) internal successors, (49), 4 states have internal predecessors, (49), 2 states have call successors, (18), 3 states have call predecessors, (18), 3 states have return successors, (16), 2 states have call predecessors, (16), 2 states have call successors, (16) [2023-11-19 05:14:22,440 INFO L276 IsEmpty]: Start isEmpty. Operand 837 states and 1320 transitions. [2023-11-19 05:14:22,453 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 101 [2023-11-19 05:14:22,454 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:14:22,454 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:14:22,482 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25db2b55-aa14-44a1-92ce-3befb4013adf/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-11-19 05:14:22,669 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25db2b55-aa14-44a1-92ce-3befb4013adf/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:14:22,670 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:14:22,671 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:14:22,671 INFO L85 PathProgramCache]: Analyzing trace with hash -2055339779, now seen corresponding path program 1 times [2023-11-19 05:14:22,671 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:14:22,672 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [570648723] [2023-11-19 05:14:22,672 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:14:22,673 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:14:22,832 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:14:23,116 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2023-11-19 05:14:23,117 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:14:23,117 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [570648723] [2023-11-19 05:14:23,118 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [570648723] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 05:14:23,118 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2018389991] [2023-11-19 05:14:23,118 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:14:23,119 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:14:23,119 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25db2b55-aa14-44a1-92ce-3befb4013adf/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:14:23,120 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25db2b55-aa14-44a1-92ce-3befb4013adf/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:14:23,148 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25db2b55-aa14-44a1-92ce-3befb4013adf/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-19 05:14:23,552 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:14:23,560 INFO L262 TraceCheckSpWp]: Trace formula consists of 1345 conjuncts, 5 conjunts are in the unsatisfiable core [2023-11-19 05:14:23,625 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:14:23,656 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-11-19 05:14:23,657 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-19 05:14:23,657 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2018389991] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 05:14:23,657 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-19 05:14:23,658 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [4] total 4 [2023-11-19 05:14:23,658 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1225412535] [2023-11-19 05:14:23,658 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 05:14:23,661 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-19 05:14:23,662 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:14:23,663 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-19 05:14:23,663 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-19 05:14:23,663 INFO L87 Difference]: Start difference. First operand 837 states and 1320 transitions. Second operand has 4 states, 4 states have (on average 14.0) internal successors, (56), 4 states have internal predecessors, (56), 2 states have call successors, (19), 2 states have call predecessors, (19), 3 states have return successors, (17), 2 states have call predecessors, (17), 2 states have call successors, (17) [2023-11-19 05:14:23,920 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:14:23,921 INFO L93 Difference]: Finished difference Result 1671 states and 2655 transitions. [2023-11-19 05:14:23,921 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-11-19 05:14:23,921 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 14.0) internal successors, (56), 4 states have internal predecessors, (56), 2 states have call successors, (19), 2 states have call predecessors, (19), 3 states have return successors, (17), 2 states have call predecessors, (17), 2 states have call successors, (17) Word has length 100 [2023-11-19 05:14:23,922 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:14:23,932 INFO L225 Difference]: With dead ends: 1671 [2023-11-19 05:14:23,932 INFO L226 Difference]: Without dead ends: 849 [2023-11-19 05:14:23,938 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 104 GetRequests, 101 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2023-11-19 05:14:23,940 INFO L413 NwaCegarLoop]: 626 mSDtfsCounter, 85 mSDsluCounter, 1165 mSDsCounter, 0 mSdLazyCounter, 139 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 85 SdHoareTripleChecker+Valid, 1791 SdHoareTripleChecker+Invalid, 144 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 139 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-19 05:14:23,942 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [85 Valid, 1791 Invalid, 144 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 139 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-19 05:14:23,946 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 849 states. [2023-11-19 05:14:24,010 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 849 to 849. [2023-11-19 05:14:24,013 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 849 states, 589 states have (on average 1.5551782682512734) internal successors, (916), 619 states have internal predecessors, (916), 206 states have call successors, (206), 56 states have call predecessors, (206), 53 states have return successors, (210), 198 states have call predecessors, (210), 202 states have call successors, (210) [2023-11-19 05:14:24,027 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 849 states to 849 states and 1332 transitions. [2023-11-19 05:14:24,028 INFO L78 Accepts]: Start accepts. Automaton has 849 states and 1332 transitions. Word has length 100 [2023-11-19 05:14:24,029 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:14:24,029 INFO L495 AbstractCegarLoop]: Abstraction has 849 states and 1332 transitions. [2023-11-19 05:14:24,029 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 14.0) internal successors, (56), 4 states have internal predecessors, (56), 2 states have call successors, (19), 2 states have call predecessors, (19), 3 states have return successors, (17), 2 states have call predecessors, (17), 2 states have call successors, (17) [2023-11-19 05:14:24,030 INFO L276 IsEmpty]: Start isEmpty. Operand 849 states and 1332 transitions. [2023-11-19 05:14:24,037 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2023-11-19 05:14:24,037 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:14:24,038 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:14:24,069 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25db2b55-aa14-44a1-92ce-3befb4013adf/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-11-19 05:14:24,253 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25db2b55-aa14-44a1-92ce-3befb4013adf/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:14:24,254 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:14:24,254 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:14:24,254 INFO L85 PathProgramCache]: Analyzing trace with hash -925341452, now seen corresponding path program 1 times [2023-11-19 05:14:24,255 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:14:24,255 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1618782210] [2023-11-19 05:14:24,255 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:14:24,255 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:14:24,318 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:14:24,561 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2023-11-19 05:14:24,561 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:14:24,562 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1618782210] [2023-11-19 05:14:24,562 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1618782210] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 05:14:24,562 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [504288387] [2023-11-19 05:14:24,563 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:14:24,563 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:14:24,563 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25db2b55-aa14-44a1-92ce-3befb4013adf/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:14:24,564 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25db2b55-aa14-44a1-92ce-3befb4013adf/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:14:24,592 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25db2b55-aa14-44a1-92ce-3befb4013adf/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-19 05:14:24,990 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:14:24,998 INFO L262 TraceCheckSpWp]: Trace formula consists of 1350 conjuncts, 5 conjunts are in the unsatisfiable core [2023-11-19 05:14:25,006 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:14:25,048 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2023-11-19 05:14:25,049 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-19 05:14:25,049 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [504288387] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 05:14:25,049 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-19 05:14:25,050 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [5] total 7 [2023-11-19 05:14:25,050 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [787888505] [2023-11-19 05:14:25,050 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 05:14:25,052 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-19 05:14:25,053 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:14:25,054 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-19 05:14:25,054 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2023-11-19 05:14:25,055 INFO L87 Difference]: Start difference. First operand 849 states and 1332 transitions. Second operand has 4 states, 4 states have (on average 14.5) internal successors, (58), 4 states have internal predecessors, (58), 2 states have call successors, (19), 2 states have call predecessors, (19), 3 states have return successors, (17), 2 states have call predecessors, (17), 2 states have call successors, (17) [2023-11-19 05:14:25,310 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:14:25,313 INFO L93 Difference]: Finished difference Result 1689 states and 2665 transitions. [2023-11-19 05:14:25,313 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-11-19 05:14:25,314 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 14.5) internal successors, (58), 4 states have internal predecessors, (58), 2 states have call successors, (19), 2 states have call predecessors, (19), 3 states have return successors, (17), 2 states have call predecessors, (17), 2 states have call successors, (17) Word has length 102 [2023-11-19 05:14:25,315 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:14:25,323 INFO L225 Difference]: With dead ends: 1689 [2023-11-19 05:14:25,323 INFO L226 Difference]: Without dead ends: 847 [2023-11-19 05:14:25,330 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 108 GetRequests, 102 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2023-11-19 05:14:25,332 INFO L413 NwaCegarLoop]: 625 mSDtfsCounter, 91 mSDsluCounter, 1162 mSDsCounter, 0 mSdLazyCounter, 134 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 91 SdHoareTripleChecker+Valid, 1787 SdHoareTripleChecker+Invalid, 138 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 134 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-19 05:14:25,333 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [91 Valid, 1787 Invalid, 138 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 134 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-19 05:14:25,335 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 847 states. [2023-11-19 05:14:25,377 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 847 to 847. [2023-11-19 05:14:25,380 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 847 states, 587 states have (on average 1.546848381601363) internal successors, (908), 617 states have internal predecessors, (908), 206 states have call successors, (206), 56 states have call predecessors, (206), 53 states have return successors, (210), 198 states have call predecessors, (210), 202 states have call successors, (210) [2023-11-19 05:14:25,393 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 847 states to 847 states and 1324 transitions. [2023-11-19 05:14:25,394 INFO L78 Accepts]: Start accepts. Automaton has 847 states and 1324 transitions. Word has length 102 [2023-11-19 05:14:25,395 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:14:25,395 INFO L495 AbstractCegarLoop]: Abstraction has 847 states and 1324 transitions. [2023-11-19 05:14:25,396 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 14.5) internal successors, (58), 4 states have internal predecessors, (58), 2 states have call successors, (19), 2 states have call predecessors, (19), 3 states have return successors, (17), 2 states have call predecessors, (17), 2 states have call successors, (17) [2023-11-19 05:14:25,396 INFO L276 IsEmpty]: Start isEmpty. Operand 847 states and 1324 transitions. [2023-11-19 05:14:25,400 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2023-11-19 05:14:25,401 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:14:25,401 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:14:25,429 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25db2b55-aa14-44a1-92ce-3befb4013adf/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-11-19 05:14:25,620 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25db2b55-aa14-44a1-92ce-3befb4013adf/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:14:25,621 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:14:25,621 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:14:25,621 INFO L85 PathProgramCache]: Analyzing trace with hash -728605954, now seen corresponding path program 1 times [2023-11-19 05:14:25,622 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:14:25,622 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2125004746] [2023-11-19 05:14:25,622 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:14:25,622 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:14:25,683 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:14:25,924 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2023-11-19 05:14:25,924 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:14:25,925 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2125004746] [2023-11-19 05:14:25,926 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2125004746] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 05:14:25,926 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [382799831] [2023-11-19 05:14:25,926 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:14:25,926 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:14:25,927 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25db2b55-aa14-44a1-92ce-3befb4013adf/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:14:25,928 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25db2b55-aa14-44a1-92ce-3befb4013adf/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:14:25,952 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25db2b55-aa14-44a1-92ce-3befb4013adf/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-11-19 05:14:26,362 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:14:26,370 INFO L262 TraceCheckSpWp]: Trace formula consists of 1354 conjuncts, 4 conjunts are in the unsatisfiable core [2023-11-19 05:14:26,377 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:14:26,454 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-11-19 05:14:26,454 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-19 05:14:26,455 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [382799831] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 05:14:26,455 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-19 05:14:26,455 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [5] total 8 [2023-11-19 05:14:26,456 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1448405573] [2023-11-19 05:14:26,456 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 05:14:26,457 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-19 05:14:26,457 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:14:26,458 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-19 05:14:26,458 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2023-11-19 05:14:26,458 INFO L87 Difference]: Start difference. First operand 847 states and 1324 transitions. Second operand has 5 states, 5 states have (on average 11.8) internal successors, (59), 5 states have internal predecessors, (59), 3 states have call successors, (19), 3 states have call predecessors, (19), 3 states have return successors, (17), 3 states have call predecessors, (17), 3 states have call successors, (17) [2023-11-19 05:14:27,730 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:14:27,732 INFO L93 Difference]: Finished difference Result 2071 states and 3280 transitions. [2023-11-19 05:14:27,733 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-19 05:14:27,733 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 11.8) internal successors, (59), 5 states have internal predecessors, (59), 3 states have call successors, (19), 3 states have call predecessors, (19), 3 states have return successors, (17), 3 states have call predecessors, (17), 3 states have call successors, (17) Word has length 103 [2023-11-19 05:14:27,737 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:14:27,753 INFO L225 Difference]: With dead ends: 2071 [2023-11-19 05:14:27,753 INFO L226 Difference]: Without dead ends: 1239 [2023-11-19 05:14:27,764 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 108 GetRequests, 101 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=54, Unknown=0, NotChecked=0, Total=72 [2023-11-19 05:14:27,769 INFO L413 NwaCegarLoop]: 693 mSDtfsCounter, 638 mSDsluCounter, 1427 mSDsCounter, 0 mSdLazyCounter, 903 mSolverCounterSat, 31 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 640 SdHoareTripleChecker+Valid, 2120 SdHoareTripleChecker+Invalid, 934 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 31 IncrementalHoareTripleChecker+Valid, 903 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2023-11-19 05:14:27,771 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [640 Valid, 2120 Invalid, 934 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [31 Valid, 903 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2023-11-19 05:14:27,777 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1239 states. [2023-11-19 05:14:27,852 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1239 to 1219. [2023-11-19 05:14:27,856 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1219 states, 844 states have (on average 1.4928909952606635) internal successors, (1260), 889 states have internal predecessors, (1260), 294 states have call successors, (294), 84 states have call predecessors, (294), 80 states have return successors, (322), 282 states have call predecessors, (322), 289 states have call successors, (322) [2023-11-19 05:14:27,883 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1219 states to 1219 states and 1876 transitions. [2023-11-19 05:14:27,883 INFO L78 Accepts]: Start accepts. Automaton has 1219 states and 1876 transitions. Word has length 103 [2023-11-19 05:14:27,884 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:14:27,884 INFO L495 AbstractCegarLoop]: Abstraction has 1219 states and 1876 transitions. [2023-11-19 05:14:27,885 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 11.8) internal successors, (59), 5 states have internal predecessors, (59), 3 states have call successors, (19), 3 states have call predecessors, (19), 3 states have return successors, (17), 3 states have call predecessors, (17), 3 states have call successors, (17) [2023-11-19 05:14:27,885 INFO L276 IsEmpty]: Start isEmpty. Operand 1219 states and 1876 transitions. [2023-11-19 05:14:27,889 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2023-11-19 05:14:27,890 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:14:27,890 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:14:27,919 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25db2b55-aa14-44a1-92ce-3befb4013adf/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-11-19 05:14:28,105 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25db2b55-aa14-44a1-92ce-3befb4013adf/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:14:28,106 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:14:28,106 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:14:28,106 INFO L85 PathProgramCache]: Analyzing trace with hash -2082882485, now seen corresponding path program 1 times [2023-11-19 05:14:28,106 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:14:28,107 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [357095668] [2023-11-19 05:14:28,107 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:14:28,107 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:14:28,211 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:14:28,677 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2023-11-19 05:14:28,677 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:14:28,677 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [357095668] [2023-11-19 05:14:28,678 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [357095668] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 05:14:28,678 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1650274141] [2023-11-19 05:14:28,678 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:14:28,678 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:14:28,679 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25db2b55-aa14-44a1-92ce-3befb4013adf/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:14:28,680 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25db2b55-aa14-44a1-92ce-3befb4013adf/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:14:28,705 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25db2b55-aa14-44a1-92ce-3befb4013adf/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-11-19 05:14:29,054 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:14:29,061 INFO L262 TraceCheckSpWp]: Trace formula consists of 1355 conjuncts, 8 conjunts are in the unsatisfiable core [2023-11-19 05:14:29,067 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:14:29,278 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2023-11-19 05:14:29,279 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-19 05:14:29,279 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1650274141] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 05:14:29,279 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-19 05:14:29,279 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [8] total 12 [2023-11-19 05:14:29,280 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1822324092] [2023-11-19 05:14:29,280 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 05:14:29,280 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-11-19 05:14:29,281 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:14:29,281 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-11-19 05:14:29,282 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=109, Unknown=0, NotChecked=0, Total=132 [2023-11-19 05:14:29,282 INFO L87 Difference]: Start difference. First operand 1219 states and 1876 transitions. Second operand has 6 states, 5 states have (on average 11.4) internal successors, (57), 4 states have internal predecessors, (57), 3 states have call successors, (19), 3 states have call predecessors, (19), 4 states have return successors, (17), 4 states have call predecessors, (17), 3 states have call successors, (17) [2023-11-19 05:14:30,452 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:14:30,452 INFO L93 Difference]: Finished difference Result 2650 states and 4075 transitions. [2023-11-19 05:14:30,453 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2023-11-19 05:14:30,453 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 11.4) internal successors, (57), 4 states have internal predecessors, (57), 3 states have call successors, (19), 3 states have call predecessors, (19), 4 states have return successors, (17), 4 states have call predecessors, (17), 3 states have call successors, (17) Word has length 104 [2023-11-19 05:14:30,453 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:14:30,465 INFO L225 Difference]: With dead ends: 2650 [2023-11-19 05:14:30,465 INFO L226 Difference]: Without dead ends: 1446 [2023-11-19 05:14:30,475 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 115 GetRequests, 101 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=44, Invalid=196, Unknown=0, NotChecked=0, Total=240 [2023-11-19 05:14:30,476 INFO L413 NwaCegarLoop]: 831 mSDtfsCounter, 771 mSDsluCounter, 2739 mSDsCounter, 0 mSdLazyCounter, 507 mSolverCounterSat, 313 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 772 SdHoareTripleChecker+Valid, 3570 SdHoareTripleChecker+Invalid, 820 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 313 IncrementalHoareTripleChecker+Valid, 507 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2023-11-19 05:14:30,477 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [772 Valid, 3570 Invalid, 820 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [313 Valid, 507 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2023-11-19 05:14:30,480 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1446 states. [2023-11-19 05:14:30,557 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1446 to 1427. [2023-11-19 05:14:30,561 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1427 states, 1005 states have (on average 1.4796019900497512) internal successors, (1487), 1048 states have internal predecessors, (1487), 318 states have call successors, (318), 108 states have call predecessors, (318), 103 states have return successors, (373), 307 states have call predecessors, (373), 311 states have call successors, (373) [2023-11-19 05:14:30,578 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1427 states to 1427 states and 2178 transitions. [2023-11-19 05:14:30,579 INFO L78 Accepts]: Start accepts. Automaton has 1427 states and 2178 transitions. Word has length 104 [2023-11-19 05:14:30,579 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:14:30,580 INFO L495 AbstractCegarLoop]: Abstraction has 1427 states and 2178 transitions. [2023-11-19 05:14:30,580 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 11.4) internal successors, (57), 4 states have internal predecessors, (57), 3 states have call successors, (19), 3 states have call predecessors, (19), 4 states have return successors, (17), 4 states have call predecessors, (17), 3 states have call successors, (17) [2023-11-19 05:14:30,580 INFO L276 IsEmpty]: Start isEmpty. Operand 1427 states and 2178 transitions. [2023-11-19 05:14:30,584 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2023-11-19 05:14:30,584 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:14:30,585 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:14:30,619 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25db2b55-aa14-44a1-92ce-3befb4013adf/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-11-19 05:14:30,801 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25db2b55-aa14-44a1-92ce-3befb4013adf/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:14:30,802 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:14:30,802 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:14:30,802 INFO L85 PathProgramCache]: Analyzing trace with hash 1378464279, now seen corresponding path program 1 times [2023-11-19 05:14:30,803 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:14:30,803 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1972045419] [2023-11-19 05:14:30,803 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:14:30,803 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:14:30,904 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:14:31,126 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2023-11-19 05:14:31,126 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:14:31,126 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1972045419] [2023-11-19 05:14:31,127 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1972045419] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 05:14:31,127 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [706468883] [2023-11-19 05:14:31,127 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:14:31,127 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:14:31,127 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25db2b55-aa14-44a1-92ce-3befb4013adf/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:14:31,129 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25db2b55-aa14-44a1-92ce-3befb4013adf/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:14:31,134 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25db2b55-aa14-44a1-92ce-3befb4013adf/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-11-19 05:14:31,478 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:14:31,484 INFO L262 TraceCheckSpWp]: Trace formula consists of 1357 conjuncts, 5 conjunts are in the unsatisfiable core [2023-11-19 05:14:31,489 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:14:31,523 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2023-11-19 05:14:31,523 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-19 05:14:31,523 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [706468883] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 05:14:31,524 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-19 05:14:31,524 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [5] total 8 [2023-11-19 05:14:31,524 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [972357659] [2023-11-19 05:14:31,524 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 05:14:31,525 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-19 05:14:31,525 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:14:31,526 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-19 05:14:31,526 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2023-11-19 05:14:31,526 INFO L87 Difference]: Start difference. First operand 1427 states and 2178 transitions. Second operand has 5 states, 5 states have (on average 11.8) internal successors, (59), 4 states have internal predecessors, (59), 2 states have call successors, (19), 2 states have call predecessors, (19), 3 states have return successors, (17), 3 states have call predecessors, (17), 2 states have call successors, (17) [2023-11-19 05:14:31,863 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:14:31,864 INFO L93 Difference]: Finished difference Result 2860 states and 4403 transitions. [2023-11-19 05:14:31,864 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-11-19 05:14:31,865 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 11.8) internal successors, (59), 4 states have internal predecessors, (59), 2 states have call successors, (19), 2 states have call predecessors, (19), 3 states have return successors, (17), 3 states have call predecessors, (17), 2 states have call successors, (17) Word has length 104 [2023-11-19 05:14:31,865 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:14:31,884 INFO L225 Difference]: With dead ends: 2860 [2023-11-19 05:14:31,884 INFO L226 Difference]: Without dead ends: 1456 [2023-11-19 05:14:31,897 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 108 GetRequests, 102 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2023-11-19 05:14:31,899 INFO L413 NwaCegarLoop]: 635 mSDtfsCounter, 1 mSDsluCounter, 1890 mSDsCounter, 0 mSdLazyCounter, 164 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 2525 SdHoareTripleChecker+Invalid, 173 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 164 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-19 05:14:31,899 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 2525 Invalid, 173 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [9 Valid, 164 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-19 05:14:31,903 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1456 states. [2023-11-19 05:14:31,999 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1456 to 1439. [2023-11-19 05:14:32,003 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1439 states, 1014 states have (on average 1.47534516765286) internal successors, (1496), 1057 states have internal predecessors, (1496), 318 states have call successors, (318), 108 states have call predecessors, (318), 106 states have return successors, (376), 310 states have call predecessors, (376), 311 states have call successors, (376) [2023-11-19 05:14:32,021 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1439 states to 1439 states and 2190 transitions. [2023-11-19 05:14:32,022 INFO L78 Accepts]: Start accepts. Automaton has 1439 states and 2190 transitions. Word has length 104 [2023-11-19 05:14:32,023 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:14:32,023 INFO L495 AbstractCegarLoop]: Abstraction has 1439 states and 2190 transitions. [2023-11-19 05:14:32,024 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 11.8) internal successors, (59), 4 states have internal predecessors, (59), 2 states have call successors, (19), 2 states have call predecessors, (19), 3 states have return successors, (17), 3 states have call predecessors, (17), 2 states have call successors, (17) [2023-11-19 05:14:32,024 INFO L276 IsEmpty]: Start isEmpty. Operand 1439 states and 2190 transitions. [2023-11-19 05:14:32,032 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 107 [2023-11-19 05:14:32,033 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:14:32,033 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:14:32,067 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25db2b55-aa14-44a1-92ce-3befb4013adf/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2023-11-19 05:14:32,249 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25db2b55-aa14-44a1-92ce-3befb4013adf/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:14:32,250 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:14:32,250 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:14:32,250 INFO L85 PathProgramCache]: Analyzing trace with hash -1341364136, now seen corresponding path program 1 times [2023-11-19 05:14:32,250 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:14:32,251 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1989608881] [2023-11-19 05:14:32,251 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:14:32,251 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:14:32,322 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:14:32,624 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2023-11-19 05:14:32,624 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:14:32,624 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1989608881] [2023-11-19 05:14:32,625 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1989608881] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 05:14:32,625 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1345914817] [2023-11-19 05:14:32,625 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:14:32,625 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:14:32,626 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25db2b55-aa14-44a1-92ce-3befb4013adf/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:14:32,627 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25db2b55-aa14-44a1-92ce-3befb4013adf/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:14:32,649 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25db2b55-aa14-44a1-92ce-3befb4013adf/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-11-19 05:14:33,027 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:14:33,035 INFO L262 TraceCheckSpWp]: Trace formula consists of 1361 conjuncts, 4 conjunts are in the unsatisfiable core [2023-11-19 05:14:33,041 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:14:33,096 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2023-11-19 05:14:33,097 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-19 05:14:33,097 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1345914817] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 05:14:33,097 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-19 05:14:33,097 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [4] total 6 [2023-11-19 05:14:33,098 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [107365134] [2023-11-19 05:14:33,098 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 05:14:33,099 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-19 05:14:33,099 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:14:33,100 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-19 05:14:33,100 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-19 05:14:33,100 INFO L87 Difference]: Start difference. First operand 1439 states and 2190 transitions. Second operand has 4 states, 4 states have (on average 15.25) internal successors, (61), 4 states have internal predecessors, (61), 2 states have call successors, (19), 2 states have call predecessors, (19), 2 states have return successors, (17), 2 states have call predecessors, (17), 2 states have call successors, (17) [2023-11-19 05:14:33,592 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:14:33,592 INFO L93 Difference]: Finished difference Result 2929 states and 4525 transitions. [2023-11-19 05:14:33,598 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-19 05:14:33,598 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 15.25) internal successors, (61), 4 states have internal predecessors, (61), 2 states have call successors, (19), 2 states have call predecessors, (19), 2 states have return successors, (17), 2 states have call predecessors, (17), 2 states have call successors, (17) Word has length 106 [2023-11-19 05:14:33,599 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:14:33,614 INFO L225 Difference]: With dead ends: 2929 [2023-11-19 05:14:33,614 INFO L226 Difference]: Without dead ends: 1514 [2023-11-19 05:14:33,633 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 106 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-19 05:14:33,635 INFO L413 NwaCegarLoop]: 623 mSDtfsCounter, 19 mSDsluCounter, 1116 mSDsCounter, 0 mSdLazyCounter, 277 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 1739 SdHoareTripleChecker+Invalid, 279 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 277 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-11-19 05:14:33,636 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [19 Valid, 1739 Invalid, 279 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 277 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-11-19 05:14:33,639 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1514 states. [2023-11-19 05:14:33,725 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1514 to 1496. [2023-11-19 05:14:33,730 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1496 states, 1071 states have (on average 1.4836601307189543) internal successors, (1589), 1114 states have internal predecessors, (1589), 318 states have call successors, (318), 108 states have call predecessors, (318), 106 states have return successors, (376), 310 states have call predecessors, (376), 311 states have call successors, (376) [2023-11-19 05:14:33,747 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1496 states to 1496 states and 2283 transitions. [2023-11-19 05:14:33,748 INFO L78 Accepts]: Start accepts. Automaton has 1496 states and 2283 transitions. Word has length 106 [2023-11-19 05:14:33,749 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:14:33,749 INFO L495 AbstractCegarLoop]: Abstraction has 1496 states and 2283 transitions. [2023-11-19 05:14:33,750 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 15.25) internal successors, (61), 4 states have internal predecessors, (61), 2 states have call successors, (19), 2 states have call predecessors, (19), 2 states have return successors, (17), 2 states have call predecessors, (17), 2 states have call successors, (17) [2023-11-19 05:14:33,750 INFO L276 IsEmpty]: Start isEmpty. Operand 1496 states and 2283 transitions. [2023-11-19 05:14:33,754 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 109 [2023-11-19 05:14:33,755 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:14:33,755 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:14:33,784 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25db2b55-aa14-44a1-92ce-3befb4013adf/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2023-11-19 05:14:33,977 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25db2b55-aa14-44a1-92ce-3befb4013adf/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:14:33,978 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:14:33,978 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:14:33,978 INFO L85 PathProgramCache]: Analyzing trace with hash 970084142, now seen corresponding path program 1 times [2023-11-19 05:14:33,979 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:14:33,979 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [77206911] [2023-11-19 05:14:33,979 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:14:33,979 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:14:34,046 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:14:34,279 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2023-11-19 05:14:34,280 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:14:34,280 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [77206911] [2023-11-19 05:14:34,280 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [77206911] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 05:14:34,280 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2081987807] [2023-11-19 05:14:34,280 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:14:34,281 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:14:34,281 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25db2b55-aa14-44a1-92ce-3befb4013adf/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:14:34,282 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25db2b55-aa14-44a1-92ce-3befb4013adf/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:14:34,291 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25db2b55-aa14-44a1-92ce-3befb4013adf/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-11-19 05:14:34,650 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:14:34,656 INFO L262 TraceCheckSpWp]: Trace formula consists of 1363 conjuncts, 4 conjunts are in the unsatisfiable core [2023-11-19 05:14:34,661 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:14:34,721 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-11-19 05:14:34,721 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-19 05:14:34,721 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2081987807] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 05:14:34,721 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-19 05:14:34,722 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [4] total 7 [2023-11-19 05:14:34,724 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1837523945] [2023-11-19 05:14:34,725 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 05:14:34,725 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-19 05:14:34,726 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:14:34,726 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-19 05:14:34,727 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-11-19 05:14:34,727 INFO L87 Difference]: Start difference. First operand 1496 states and 2283 transitions. Second operand has 5 states, 5 states have (on average 12.8) internal successors, (64), 5 states have internal predecessors, (64), 3 states have call successors, (19), 3 states have call predecessors, (19), 3 states have return successors, (17), 3 states have call predecessors, (17), 3 states have call successors, (17) [2023-11-19 05:14:36,140 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:14:36,140 INFO L93 Difference]: Finished difference Result 3578 states and 5662 transitions. [2023-11-19 05:14:36,141 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-19 05:14:36,141 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 12.8) internal successors, (64), 5 states have internal predecessors, (64), 3 states have call successors, (19), 3 states have call predecessors, (19), 3 states have return successors, (17), 3 states have call predecessors, (17), 3 states have call successors, (17) Word has length 108 [2023-11-19 05:14:36,142 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:14:36,169 INFO L225 Difference]: With dead ends: 3578 [2023-11-19 05:14:36,170 INFO L226 Difference]: Without dead ends: 2519 [2023-11-19 05:14:36,186 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 113 GetRequests, 107 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2023-11-19 05:14:36,188 INFO L413 NwaCegarLoop]: 724 mSDtfsCounter, 660 mSDsluCounter, 1298 mSDsCounter, 0 mSdLazyCounter, 865 mSolverCounterSat, 30 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 662 SdHoareTripleChecker+Valid, 2022 SdHoareTripleChecker+Invalid, 895 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 30 IncrementalHoareTripleChecker+Valid, 865 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2023-11-19 05:14:36,188 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [662 Valid, 2022 Invalid, 895 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [30 Valid, 865 Invalid, 0 Unknown, 0 Unchecked, 1.2s Time] [2023-11-19 05:14:36,195 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2519 states. [2023-11-19 05:14:36,391 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2519 to 2466. [2023-11-19 05:14:36,399 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2466 states, 1767 states have (on average 1.4770797962648556) internal successors, (2610), 1836 states have internal predecessors, (2610), 520 states have call successors, (520), 180 states have call predecessors, (520), 178 states have return successors, (737), 510 states have call predecessors, (737), 509 states have call successors, (737) [2023-11-19 05:14:36,429 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2466 states to 2466 states and 3867 transitions. [2023-11-19 05:14:36,430 INFO L78 Accepts]: Start accepts. Automaton has 2466 states and 3867 transitions. Word has length 108 [2023-11-19 05:14:36,431 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:14:36,431 INFO L495 AbstractCegarLoop]: Abstraction has 2466 states and 3867 transitions. [2023-11-19 05:14:36,431 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 12.8) internal successors, (64), 5 states have internal predecessors, (64), 3 states have call successors, (19), 3 states have call predecessors, (19), 3 states have return successors, (17), 3 states have call predecessors, (17), 3 states have call successors, (17) [2023-11-19 05:14:36,431 INFO L276 IsEmpty]: Start isEmpty. Operand 2466 states and 3867 transitions. [2023-11-19 05:14:36,437 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 109 [2023-11-19 05:14:36,437 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:14:36,437 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:14:36,471 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25db2b55-aa14-44a1-92ce-3befb4013adf/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2023-11-19 05:14:36,665 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25db2b55-aa14-44a1-92ce-3befb4013adf/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:14:36,666 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:14:36,666 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:14:36,666 INFO L85 PathProgramCache]: Analyzing trace with hash -1295220968, now seen corresponding path program 1 times [2023-11-19 05:14:36,666 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:14:36,666 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [149208846] [2023-11-19 05:14:36,667 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:14:36,667 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:14:36,727 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:14:36,886 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 2 proven. 3 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2023-11-19 05:14:36,887 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:14:36,887 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [149208846] [2023-11-19 05:14:36,887 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [149208846] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 05:14:36,887 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [837892320] [2023-11-19 05:14:36,888 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:14:36,888 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:14:36,888 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25db2b55-aa14-44a1-92ce-3befb4013adf/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:14:36,889 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25db2b55-aa14-44a1-92ce-3befb4013adf/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:14:36,909 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25db2b55-aa14-44a1-92ce-3befb4013adf/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2023-11-19 05:14:37,239 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:14:37,244 INFO L262 TraceCheckSpWp]: Trace formula consists of 1362 conjuncts, 3 conjunts are in the unsatisfiable core [2023-11-19 05:14:37,249 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:14:37,264 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2023-11-19 05:14:37,264 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-19 05:14:37,264 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [837892320] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 05:14:37,265 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-19 05:14:37,265 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [4] total 4 [2023-11-19 05:14:37,265 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [277199065] [2023-11-19 05:14:37,265 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 05:14:37,266 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-19 05:14:37,266 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:14:37,267 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-19 05:14:37,267 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-11-19 05:14:37,267 INFO L87 Difference]: Start difference. First operand 2466 states and 3867 transitions. Second operand has 4 states, 4 states have (on average 15.5) internal successors, (62), 4 states have internal predecessors, (62), 2 states have call successors, (19), 2 states have call predecessors, (19), 2 states have return successors, (17), 2 states have call predecessors, (17), 2 states have call successors, (17) [2023-11-19 05:14:37,580 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:14:37,581 INFO L93 Difference]: Finished difference Result 4972 states and 7958 transitions. [2023-11-19 05:14:37,581 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-19 05:14:37,581 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 15.5) internal successors, (62), 4 states have internal predecessors, (62), 2 states have call successors, (19), 2 states have call predecessors, (19), 2 states have return successors, (17), 2 states have call predecessors, (17), 2 states have call successors, (17) Word has length 108 [2023-11-19 05:14:37,582 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:14:37,606 INFO L225 Difference]: With dead ends: 4972 [2023-11-19 05:14:37,607 INFO L226 Difference]: Without dead ends: 2530 [2023-11-19 05:14:37,631 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 111 GetRequests, 109 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-11-19 05:14:37,632 INFO L413 NwaCegarLoop]: 637 mSDtfsCounter, 5 mSDsluCounter, 620 mSDsCounter, 0 mSdLazyCounter, 95 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 1257 SdHoareTripleChecker+Invalid, 99 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 95 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-19 05:14:37,633 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [5 Valid, 1257 Invalid, 99 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 95 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-19 05:14:37,637 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2530 states. [2023-11-19 05:14:37,770 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2530 to 2476. [2023-11-19 05:14:37,778 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2476 states, 1777 states have (on average 1.4642656162070906) internal successors, (2602), 1846 states have internal predecessors, (2602), 520 states have call successors, (520), 180 states have call predecessors, (520), 178 states have return successors, (737), 510 states have call predecessors, (737), 509 states have call successors, (737) [2023-11-19 05:14:37,801 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2476 states to 2476 states and 3859 transitions. [2023-11-19 05:14:37,802 INFO L78 Accepts]: Start accepts. Automaton has 2476 states and 3859 transitions. Word has length 108 [2023-11-19 05:14:37,803 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:14:37,803 INFO L495 AbstractCegarLoop]: Abstraction has 2476 states and 3859 transitions. [2023-11-19 05:14:37,803 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 15.5) internal successors, (62), 4 states have internal predecessors, (62), 2 states have call successors, (19), 2 states have call predecessors, (19), 2 states have return successors, (17), 2 states have call predecessors, (17), 2 states have call successors, (17) [2023-11-19 05:14:37,803 INFO L276 IsEmpty]: Start isEmpty. Operand 2476 states and 3859 transitions. [2023-11-19 05:14:37,808 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2023-11-19 05:14:37,808 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:14:37,808 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:14:37,837 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25db2b55-aa14-44a1-92ce-3befb4013adf/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2023-11-19 05:14:38,029 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25db2b55-aa14-44a1-92ce-3befb4013adf/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:14:38,030 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:14:38,030 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:14:38,030 INFO L85 PathProgramCache]: Analyzing trace with hash 1673155987, now seen corresponding path program 1 times [2023-11-19 05:14:38,030 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:14:38,030 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [512571132] [2023-11-19 05:14:38,031 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:14:38,031 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:14:38,084 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:14:38,252 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2023-11-19 05:14:38,252 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:14:38,252 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [512571132] [2023-11-19 05:14:38,252 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [512571132] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 05:14:38,253 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1393235241] [2023-11-19 05:14:38,253 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:14:38,253 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:14:38,253 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25db2b55-aa14-44a1-92ce-3befb4013adf/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:14:38,254 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25db2b55-aa14-44a1-92ce-3befb4013adf/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:14:38,262 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25db2b55-aa14-44a1-92ce-3befb4013adf/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2023-11-19 05:14:38,576 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:14:38,583 INFO L262 TraceCheckSpWp]: Trace formula consists of 1364 conjuncts, 4 conjunts are in the unsatisfiable core [2023-11-19 05:14:38,588 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:14:38,649 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-11-19 05:14:38,650 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-19 05:14:38,650 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1393235241] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 05:14:38,650 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-19 05:14:38,650 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [4] total 7 [2023-11-19 05:14:38,652 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1977162798] [2023-11-19 05:14:38,652 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 05:14:38,653 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-19 05:14:38,653 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:14:38,654 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-19 05:14:38,654 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-11-19 05:14:38,654 INFO L87 Difference]: Start difference. First operand 2476 states and 3859 transitions. Second operand has 5 states, 5 states have (on average 13.0) internal successors, (65), 5 states have internal predecessors, (65), 3 states have call successors, (19), 3 states have call predecessors, (19), 3 states have return successors, (17), 3 states have call predecessors, (17), 3 states have call successors, (17) [2023-11-19 05:14:39,893 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:14:39,894 INFO L93 Difference]: Finished difference Result 5527 states and 8868 transitions. [2023-11-19 05:14:39,894 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-19 05:14:39,895 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 13.0) internal successors, (65), 5 states have internal predecessors, (65), 3 states have call successors, (19), 3 states have call predecessors, (19), 3 states have return successors, (17), 3 states have call predecessors, (17), 3 states have call successors, (17) Word has length 109 [2023-11-19 05:14:39,897 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:14:39,931 INFO L225 Difference]: With dead ends: 5527 [2023-11-19 05:14:39,932 INFO L226 Difference]: Without dead ends: 3493 [2023-11-19 05:14:39,950 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 114 GetRequests, 108 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2023-11-19 05:14:39,951 INFO L413 NwaCegarLoop]: 729 mSDtfsCounter, 679 mSDsluCounter, 1298 mSDsCounter, 0 mSdLazyCounter, 879 mSolverCounterSat, 30 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 681 SdHoareTripleChecker+Valid, 2027 SdHoareTripleChecker+Invalid, 909 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 30 IncrementalHoareTripleChecker+Valid, 879 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2023-11-19 05:14:39,953 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [681 Valid, 2027 Invalid, 909 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [30 Valid, 879 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2023-11-19 05:14:39,959 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3493 states. [2023-11-19 05:14:40,194 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3493 to 3444. [2023-11-19 05:14:40,214 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3444 states, 2471 states have (on average 1.462161068393363) internal successors, (3613), 2566 states have internal predecessors, (3613), 722 states have call successors, (722), 252 states have call predecessors, (722), 250 states have return successors, (1171), 710 states have call predecessors, (1171), 707 states have call successors, (1171) [2023-11-19 05:14:40,263 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3444 states to 3444 states and 5506 transitions. [2023-11-19 05:14:40,264 INFO L78 Accepts]: Start accepts. Automaton has 3444 states and 5506 transitions. Word has length 109 [2023-11-19 05:14:40,264 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:14:40,265 INFO L495 AbstractCegarLoop]: Abstraction has 3444 states and 5506 transitions. [2023-11-19 05:14:40,266 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 13.0) internal successors, (65), 5 states have internal predecessors, (65), 3 states have call successors, (19), 3 states have call predecessors, (19), 3 states have return successors, (17), 3 states have call predecessors, (17), 3 states have call successors, (17) [2023-11-19 05:14:40,266 INFO L276 IsEmpty]: Start isEmpty. Operand 3444 states and 5506 transitions. [2023-11-19 05:14:40,271 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 111 [2023-11-19 05:14:40,272 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:14:40,272 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:14:40,304 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25db2b55-aa14-44a1-92ce-3befb4013adf/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2023-11-19 05:14:40,498 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25db2b55-aa14-44a1-92ce-3befb4013adf/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2023-11-19 05:14:40,498 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:14:40,498 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:14:40,499 INFO L85 PathProgramCache]: Analyzing trace with hash -1207147004, now seen corresponding path program 1 times [2023-11-19 05:14:40,499 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:14:40,499 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [862819152] [2023-11-19 05:14:40,499 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:14:40,499 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:14:40,546 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:14:40,711 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2023-11-19 05:14:40,711 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:14:40,712 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [862819152] [2023-11-19 05:14:40,712 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [862819152] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 05:14:40,712 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1172884734] [2023-11-19 05:14:40,712 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:14:40,713 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:14:40,713 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25db2b55-aa14-44a1-92ce-3befb4013adf/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:14:40,714 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25db2b55-aa14-44a1-92ce-3befb4013adf/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:14:40,750 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25db2b55-aa14-44a1-92ce-3befb4013adf/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2023-11-19 05:14:41,082 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:14:41,088 INFO L262 TraceCheckSpWp]: Trace formula consists of 1365 conjuncts, 4 conjunts are in the unsatisfiable core [2023-11-19 05:14:41,093 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:14:41,155 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-11-19 05:14:41,156 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-19 05:14:41,156 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1172884734] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 05:14:41,156 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-19 05:14:41,156 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [4] total 7 [2023-11-19 05:14:41,157 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1856404958] [2023-11-19 05:14:41,157 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 05:14:41,157 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-19 05:14:41,157 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:14:41,158 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-19 05:14:41,158 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-11-19 05:14:41,158 INFO L87 Difference]: Start difference. First operand 3444 states and 5506 transitions. Second operand has 5 states, 5 states have (on average 13.2) internal successors, (66), 5 states have internal predecessors, (66), 3 states have call successors, (19), 3 states have call predecessors, (19), 3 states have return successors, (17), 3 states have call predecessors, (17), 3 states have call successors, (17) [2023-11-19 05:14:42,444 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:14:42,445 INFO L93 Difference]: Finished difference Result 7369 states and 12029 transitions. [2023-11-19 05:14:42,445 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-19 05:14:42,446 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 13.2) internal successors, (66), 5 states have internal predecessors, (66), 3 states have call successors, (19), 3 states have call predecessors, (19), 3 states have return successors, (17), 3 states have call predecessors, (17), 3 states have call successors, (17) Word has length 110 [2023-11-19 05:14:42,446 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:14:42,488 INFO L225 Difference]: With dead ends: 7369 [2023-11-19 05:14:42,488 INFO L226 Difference]: Without dead ends: 4370 [2023-11-19 05:14:42,508 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 115 GetRequests, 109 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2023-11-19 05:14:42,509 INFO L413 NwaCegarLoop]: 734 mSDtfsCounter, 700 mSDsluCounter, 1302 mSDsCounter, 0 mSdLazyCounter, 870 mSolverCounterSat, 26 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 702 SdHoareTripleChecker+Valid, 2036 SdHoareTripleChecker+Invalid, 896 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 26 IncrementalHoareTripleChecker+Valid, 870 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2023-11-19 05:14:42,509 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [702 Valid, 2036 Invalid, 896 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [26 Valid, 870 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2023-11-19 05:14:42,516 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4370 states. [2023-11-19 05:14:42,915 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4370 to 4237. [2023-11-19 05:14:42,924 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4237 states, 3011 states have (on average 1.4613085353703088) internal successors, (4400), 3130 states have internal predecessors, (4400), 913 states have call successors, (913), 317 states have call predecessors, (913), 312 states have return successors, (1586), 898 states have call predecessors, (1586), 895 states have call successors, (1586) [2023-11-19 05:14:42,982 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4237 states to 4237 states and 6899 transitions. [2023-11-19 05:14:42,984 INFO L78 Accepts]: Start accepts. Automaton has 4237 states and 6899 transitions. Word has length 110 [2023-11-19 05:14:42,985 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:14:42,985 INFO L495 AbstractCegarLoop]: Abstraction has 4237 states and 6899 transitions. [2023-11-19 05:14:42,985 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 13.2) internal successors, (66), 5 states have internal predecessors, (66), 3 states have call successors, (19), 3 states have call predecessors, (19), 3 states have return successors, (17), 3 states have call predecessors, (17), 3 states have call successors, (17) [2023-11-19 05:14:42,985 INFO L276 IsEmpty]: Start isEmpty. Operand 4237 states and 6899 transitions. [2023-11-19 05:14:42,991 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2023-11-19 05:14:42,992 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:14:42,992 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:14:43,029 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25db2b55-aa14-44a1-92ce-3befb4013adf/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2023-11-19 05:14:43,205 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25db2b55-aa14-44a1-92ce-3befb4013adf/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:14:43,206 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:14:43,206 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:14:43,206 INFO L85 PathProgramCache]: Analyzing trace with hash -1496276200, now seen corresponding path program 1 times [2023-11-19 05:14:43,206 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:14:43,207 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [435575738] [2023-11-19 05:14:43,207 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:14:43,207 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:14:43,265 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:14:43,458 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2023-11-19 05:14:43,458 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:14:43,459 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [435575738] [2023-11-19 05:14:43,459 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [435575738] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 05:14:43,459 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1487681258] [2023-11-19 05:14:43,459 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:14:43,460 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:14:43,460 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25db2b55-aa14-44a1-92ce-3befb4013adf/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:14:43,461 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25db2b55-aa14-44a1-92ce-3befb4013adf/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:14:43,480 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_25db2b55-aa14-44a1-92ce-3befb4013adf/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2023-11-19 05:14:43,807 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:14:43,813 INFO L262 TraceCheckSpWp]: Trace formula consists of 1363 conjuncts, 5 conjunts are in the unsatisfiable core [2023-11-19 05:14:43,818 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:14:43,922 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 7 proven. 2 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-11-19 05:14:43,923 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 05:14:44,139 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2023-11-19 05:14:44,139 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1487681258] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 05:14:44,140 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [444869545] [2023-11-19 05:14:44,167 INFO L159 IcfgInterpreter]: Started Sifa with 91 locations of interest [2023-11-19 05:14:44,168 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 05:14:44,172 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 05:14:44,178 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 05:14:44,179 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs