./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/product-lines/elevator_spec3_product11.cil.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 30e01a73 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_360e8790-17da-475c-84b4-938ec2f8b4e4/bin/utaipan-verify-mE87zJ7Ire/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_360e8790-17da-475c-84b4-938ec2f8b4e4/bin/utaipan-verify-mE87zJ7Ire/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_360e8790-17da-475c-84b4-938ec2f8b4e4/bin/utaipan-verify-mE87zJ7Ire/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_360e8790-17da-475c-84b4-938ec2f8b4e4/bin/utaipan-verify-mE87zJ7Ire/config/TaipanReach.xml -i ../../sv-benchmarks/c/product-lines/elevator_spec3_product11.cil.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_360e8790-17da-475c-84b4-938ec2f8b4e4/bin/utaipan-verify-mE87zJ7Ire/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_360e8790-17da-475c-84b4-938ec2f8b4e4/bin/utaipan-verify-mE87zJ7Ire --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 79cd0e89b784c92aef5addf1ffd5f426704de99d9c0060c88cf4cdcbae792c3b --- Real Ultimate output --- This is Ultimate 0.2.3-dev-30e01a7 [2023-11-23 21:15:08,572 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-23 21:15:08,702 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_360e8790-17da-475c-84b4-938ec2f8b4e4/bin/utaipan-verify-mE87zJ7Ire/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-11-23 21:15:08,712 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-23 21:15:08,713 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-23 21:15:08,758 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-23 21:15:08,759 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-23 21:15:08,760 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-23 21:15:08,761 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-23 21:15:08,766 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-23 21:15:08,767 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-23 21:15:08,768 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-23 21:15:08,769 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-23 21:15:08,770 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-23 21:15:08,771 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-23 21:15:08,771 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-23 21:15:08,772 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-23 21:15:08,772 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-23 21:15:08,773 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-23 21:15:08,773 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-23 21:15:08,774 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-23 21:15:08,774 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-23 21:15:08,775 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-23 21:15:08,776 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-11-23 21:15:08,778 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-23 21:15:08,778 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-23 21:15:08,779 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-23 21:15:08,779 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-23 21:15:08,779 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-11-23 21:15:08,780 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-23 21:15:08,781 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-11-23 21:15:08,781 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-23 21:15:08,782 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-11-23 21:15:08,782 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-23 21:15:08,782 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-23 21:15:08,782 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-11-23 21:15:08,783 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-23 21:15:08,783 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-23 21:15:08,783 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-23 21:15:08,784 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-23 21:15:08,784 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-11-23 21:15:08,784 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-23 21:15:08,784 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-23 21:15:08,785 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-11-23 21:15:08,785 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-11-23 21:15:08,786 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-23 21:15:08,786 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-23 21:15:08,786 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_360e8790-17da-475c-84b4-938ec2f8b4e4/bin/utaipan-verify-mE87zJ7Ire/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_360e8790-17da-475c-84b4-938ec2f8b4e4/bin/utaipan-verify-mE87zJ7Ire Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 79cd0e89b784c92aef5addf1ffd5f426704de99d9c0060c88cf4cdcbae792c3b [2023-11-23 21:15:09,165 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-23 21:15:09,197 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-23 21:15:09,200 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-23 21:15:09,203 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-23 21:15:09,203 INFO L274 PluginConnector]: CDTParser initialized [2023-11-23 21:15:09,205 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_360e8790-17da-475c-84b4-938ec2f8b4e4/bin/utaipan-verify-mE87zJ7Ire/../../sv-benchmarks/c/product-lines/elevator_spec3_product11.cil.c [2023-11-23 21:15:12,282 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-23 21:15:12,726 INFO L384 CDTParser]: Found 1 translation units. [2023-11-23 21:15:12,726 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_360e8790-17da-475c-84b4-938ec2f8b4e4/sv-benchmarks/c/product-lines/elevator_spec3_product11.cil.c [2023-11-23 21:15:12,789 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_360e8790-17da-475c-84b4-938ec2f8b4e4/bin/utaipan-verify-mE87zJ7Ire/data/aec21ac87/0cdb7f6e555f41e5adc692f59e24dbd3/FLAGe12f0c294 [2023-11-23 21:15:12,824 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_360e8790-17da-475c-84b4-938ec2f8b4e4/bin/utaipan-verify-mE87zJ7Ire/data/aec21ac87/0cdb7f6e555f41e5adc692f59e24dbd3 [2023-11-23 21:15:12,831 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-23 21:15:12,834 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-23 21:15:12,838 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-23 21:15:12,838 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-23 21:15:12,844 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-23 21:15:12,845 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 09:15:12" (1/1) ... [2023-11-23 21:15:12,846 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@598d5d66 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:15:12, skipping insertion in model container [2023-11-23 21:15:12,846 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 09:15:12" (1/1) ... [2023-11-23 21:15:12,925 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-23 21:15:13,112 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_360e8790-17da-475c-84b4-938ec2f8b4e4/sv-benchmarks/c/product-lines/elevator_spec3_product11.cil.c[1545,1558] [2023-11-23 21:15:13,601 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-23 21:15:13,620 INFO L202 MainTranslator]: Completed pre-run [2023-11-23 21:15:13,632 WARN L75 lationResultReporter]: Unsoundness Warning: Ignoring preprocessor pragma C: #pragma merger(0,"wsllib_check.i","") [48] [2023-11-23 21:15:13,634 WARN L75 lationResultReporter]: Unsoundness Warning: Ignoring preprocessor pragma C: #pragma merger(0,"libacc.i","") [57] [2023-11-23 21:15:13,634 WARN L75 lationResultReporter]: Unsoundness Warning: Ignoring preprocessor pragma C: #pragma merger(0,"UnitTests.i","") [423] [2023-11-23 21:15:13,635 WARN L75 lationResultReporter]: Unsoundness Warning: Ignoring preprocessor pragma C: #pragma merger(0,"Person.i","") [523] [2023-11-23 21:15:13,635 WARN L75 lationResultReporter]: Unsoundness Warning: Ignoring preprocessor pragma C: #pragma merger(0,"Specification3_spec.i","") [643] [2023-11-23 21:15:13,636 WARN L75 lationResultReporter]: Unsoundness Warning: Ignoring preprocessor pragma C: #pragma merger(0,"Test.i","") [832] [2023-11-23 21:15:13,636 WARN L75 lationResultReporter]: Unsoundness Warning: Ignoring preprocessor pragma C: #pragma merger(0,"scenario.i","") [1185] [2023-11-23 21:15:13,637 WARN L75 lationResultReporter]: Unsoundness Warning: Ignoring preprocessor pragma C: #pragma merger(0,"Elevator.i","") [1200] [2023-11-23 21:15:13,637 WARN L75 lationResultReporter]: Unsoundness Warning: Ignoring preprocessor pragma C: #pragma merger(0,"Floor.i","") [2726] [2023-11-23 21:15:13,638 WARN L75 lationResultReporter]: Unsoundness Warning: Ignoring preprocessor pragma C: #pragma merger(0,"featureselect.i","") [3387] [2023-11-23 21:15:13,644 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_360e8790-17da-475c-84b4-938ec2f8b4e4/sv-benchmarks/c/product-lines/elevator_spec3_product11.cil.c[1545,1558] [2023-11-23 21:15:13,785 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-23 21:15:13,825 INFO L206 MainTranslator]: Completed translation [2023-11-23 21:15:13,826 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:15:13 WrapperNode [2023-11-23 21:15:13,826 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-23 21:15:13,827 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-23 21:15:13,827 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-23 21:15:13,827 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-23 21:15:13,835 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:15:13" (1/1) ... [2023-11-23 21:15:13,893 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:15:13" (1/1) ... [2023-11-23 21:15:13,977 INFO L138 Inliner]: procedures = 91, calls = 344, calls flagged for inlining = 23, calls inlined = 20, statements flattened = 1100 [2023-11-23 21:15:13,977 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-23 21:15:13,978 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-23 21:15:13,978 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-23 21:15:13,979 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-23 21:15:13,999 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:15:13" (1/1) ... [2023-11-23 21:15:14,000 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:15:13" (1/1) ... [2023-11-23 21:15:14,015 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:15:13" (1/1) ... [2023-11-23 21:15:14,016 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:15:13" (1/1) ... [2023-11-23 21:15:14,074 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:15:13" (1/1) ... [2023-11-23 21:15:14,108 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:15:13" (1/1) ... [2023-11-23 21:15:14,115 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:15:13" (1/1) ... [2023-11-23 21:15:14,128 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:15:13" (1/1) ... [2023-11-23 21:15:14,155 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-23 21:15:14,156 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-23 21:15:14,157 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-23 21:15:14,157 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-23 21:15:14,180 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:15:13" (1/1) ... [2023-11-23 21:15:14,192 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-23 21:15:14,208 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_360e8790-17da-475c-84b4-938ec2f8b4e4/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:15:14,228 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_360e8790-17da-475c-84b4-938ec2f8b4e4/bin/utaipan-verify-mE87zJ7Ire/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-23 21:15:14,254 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_360e8790-17da-475c-84b4-938ec2f8b4e4/bin/utaipan-verify-mE87zJ7Ire/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-23 21:15:14,276 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-23 21:15:14,277 INFO L130 BoogieDeclarations]: Found specification of procedure getCurrentHeading [2023-11-23 21:15:14,277 INFO L138 BoogieDeclarations]: Found implementation of procedure getCurrentHeading [2023-11-23 21:15:14,277 INFO L130 BoogieDeclarations]: Found specification of procedure enterElevator [2023-11-23 21:15:14,278 INFO L138 BoogieDeclarations]: Found implementation of procedure enterElevator [2023-11-23 21:15:14,279 INFO L130 BoogieDeclarations]: Found specification of procedure isExecutiveFloorCalling [2023-11-23 21:15:14,279 INFO L138 BoogieDeclarations]: Found implementation of procedure isExecutiveFloorCalling [2023-11-23 21:15:14,280 INFO L130 BoogieDeclarations]: Found specification of procedure stopRequestedInDirection [2023-11-23 21:15:14,280 INFO L138 BoogieDeclarations]: Found implementation of procedure stopRequestedInDirection [2023-11-23 21:15:14,280 INFO L130 BoogieDeclarations]: Found specification of procedure bobCall [2023-11-23 21:15:14,280 INFO L138 BoogieDeclarations]: Found implementation of procedure bobCall [2023-11-23 21:15:14,281 INFO L130 BoogieDeclarations]: Found specification of procedure getReverseHeading [2023-11-23 21:15:14,282 INFO L138 BoogieDeclarations]: Found implementation of procedure getReverseHeading [2023-11-23 21:15:14,282 INFO L130 BoogieDeclarations]: Found specification of procedure cleanup [2023-11-23 21:15:14,282 INFO L138 BoogieDeclarations]: Found implementation of procedure cleanup [2023-11-23 21:15:14,283 INFO L130 BoogieDeclarations]: Found specification of procedure timeShift [2023-11-23 21:15:14,285 INFO L138 BoogieDeclarations]: Found implementation of procedure timeShift [2023-11-23 21:15:14,286 INFO L130 BoogieDeclarations]: Found specification of procedure __automaton_fail [2023-11-23 21:15:14,286 INFO L138 BoogieDeclarations]: Found implementation of procedure __automaton_fail [2023-11-23 21:15:14,286 INFO L130 BoogieDeclarations]: Found specification of procedure isTopFloor [2023-11-23 21:15:14,286 INFO L138 BoogieDeclarations]: Found implementation of procedure isTopFloor [2023-11-23 21:15:14,286 INFO L130 BoogieDeclarations]: Found specification of procedure getDestination [2023-11-23 21:15:14,287 INFO L138 BoogieDeclarations]: Found implementation of procedure getDestination [2023-11-23 21:15:14,287 INFO L130 BoogieDeclarations]: Found specification of procedure isBlocked [2023-11-23 21:15:14,287 INFO L138 BoogieDeclarations]: Found implementation of procedure isBlocked [2023-11-23 21:15:14,288 INFO L130 BoogieDeclarations]: Found specification of procedure getCurrentFloorID [2023-11-23 21:15:14,288 INFO L138 BoogieDeclarations]: Found implementation of procedure getCurrentFloorID [2023-11-23 21:15:14,288 INFO L130 BoogieDeclarations]: Found specification of procedure initTopDown [2023-11-23 21:15:14,289 INFO L138 BoogieDeclarations]: Found implementation of procedure initTopDown [2023-11-23 21:15:14,289 INFO L130 BoogieDeclarations]: Found specification of procedure resetCallOnFloor [2023-11-23 21:15:14,289 INFO L138 BoogieDeclarations]: Found implementation of procedure resetCallOnFloor [2023-11-23 21:15:14,289 INFO L130 BoogieDeclarations]: Found specification of procedure stopRequestedAtCurrentFloor__wrappee__empty [2023-11-23 21:15:14,290 INFO L138 BoogieDeclarations]: Found implementation of procedure stopRequestedAtCurrentFloor__wrappee__empty [2023-11-23 21:15:14,290 INFO L130 BoogieDeclarations]: Found specification of procedure initFloors [2023-11-23 21:15:14,290 INFO L138 BoogieDeclarations]: Found implementation of procedure initFloors [2023-11-23 21:15:14,290 INFO L130 BoogieDeclarations]: Found specification of procedure initPersonOnFloor [2023-11-23 21:15:14,291 INFO L138 BoogieDeclarations]: Found implementation of procedure initPersonOnFloor [2023-11-23 21:15:14,291 INFO L130 BoogieDeclarations]: Found specification of procedure removePersonFromFloor [2023-11-23 21:15:14,291 INFO L138 BoogieDeclarations]: Found implementation of procedure removePersonFromFloor [2023-11-23 21:15:14,291 INFO L130 BoogieDeclarations]: Found specification of procedure getOrigin [2023-11-23 21:15:14,291 INFO L138 BoogieDeclarations]: Found implementation of procedure getOrigin [2023-11-23 21:15:14,292 INFO L130 BoogieDeclarations]: Found specification of procedure continueInDirection [2023-11-23 21:15:14,292 INFO L138 BoogieDeclarations]: Found implementation of procedure continueInDirection [2023-11-23 21:15:14,292 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-23 21:15:14,292 INFO L130 BoogieDeclarations]: Found specification of procedure buttonForFloorIsPressed [2023-11-23 21:15:14,292 INFO L138 BoogieDeclarations]: Found implementation of procedure buttonForFloorIsPressed [2023-11-23 21:15:14,293 INFO L130 BoogieDeclarations]: Found specification of procedure pressInLiftFloorButton [2023-11-23 21:15:14,293 INFO L138 BoogieDeclarations]: Found implementation of procedure pressInLiftFloorButton [2023-11-23 21:15:14,293 INFO L130 BoogieDeclarations]: Found specification of procedure leaveElevator [2023-11-23 21:15:14,294 INFO L138 BoogieDeclarations]: Found implementation of procedure leaveElevator [2023-11-23 21:15:14,295 INFO L130 BoogieDeclarations]: Found specification of procedure isPersonOnFloor [2023-11-23 21:15:14,295 INFO L138 BoogieDeclarations]: Found implementation of procedure isPersonOnFloor [2023-11-23 21:15:14,295 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-23 21:15:14,296 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-23 21:15:14,296 INFO L130 BoogieDeclarations]: Found specification of procedure isFloorCalling [2023-11-23 21:15:14,296 INFO L138 BoogieDeclarations]: Found implementation of procedure isFloorCalling [2023-11-23 21:15:14,530 INFO L241 CfgBuilder]: Building ICFG [2023-11-23 21:15:14,535 INFO L267 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-23 21:15:15,945 INFO L282 CfgBuilder]: Performing block encoding [2023-11-23 21:15:16,950 INFO L304 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-23 21:15:16,951 INFO L309 CfgBuilder]: Removed 1 assume(true) statements. [2023-11-23 21:15:16,953 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 09:15:16 BoogieIcfgContainer [2023-11-23 21:15:16,953 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-23 21:15:16,957 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-23 21:15:16,957 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-23 21:15:16,961 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-23 21:15:16,961 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 09:15:12" (1/3) ... [2023-11-23 21:15:16,962 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@47ef2e99 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 09:15:16, skipping insertion in model container [2023-11-23 21:15:16,963 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:15:13" (2/3) ... [2023-11-23 21:15:16,965 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@47ef2e99 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 09:15:16, skipping insertion in model container [2023-11-23 21:15:16,965 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 09:15:16" (3/3) ... [2023-11-23 21:15:16,967 INFO L112 eAbstractionObserver]: Analyzing ICFG elevator_spec3_product11.cil.c [2023-11-23 21:15:16,992 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-23 21:15:16,993 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-11-23 21:15:17,054 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-23 21:15:17,061 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;@6541e7c4, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-23 21:15:17,061 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-11-23 21:15:17,068 INFO L276 IsEmpty]: Start isEmpty. Operand has 404 states, 270 states have (on average 1.5740740740740742) internal successors, (425), 288 states have internal predecessors, (425), 106 states have call successors, (106), 26 states have call predecessors, (106), 26 states have return successors, (106), 103 states have call predecessors, (106), 106 states have call successors, (106) [2023-11-23 21:15:17,091 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2023-11-23 21:15:17,091 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:15:17,092 INFO L195 NwaCegarLoop]: trace histogram [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] [2023-11-23 21:15:17,093 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:15:17,098 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:15:17,099 INFO L85 PathProgramCache]: Analyzing trace with hash 1209484934, now seen corresponding path program 1 times [2023-11-23 21:15:17,109 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:15:17,109 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1330574155] [2023-11-23 21:15:17,110 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:15:17,110 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:15:17,460 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:15:18,287 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-11-23 21:15:18,288 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:15:18,288 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1330574155] [2023-11-23 21:15:18,289 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1330574155] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:15:18,289 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 21:15:18,290 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2023-11-23 21:15:18,291 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1033735319] [2023-11-23 21:15:18,292 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:15:18,298 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-11-23 21:15:18,299 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:15:18,348 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-11-23 21:15:18,350 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-23 21:15:18,355 INFO L87 Difference]: Start difference. First operand has 404 states, 270 states have (on average 1.5740740740740742) internal successors, (425), 288 states have internal predecessors, (425), 106 states have call successors, (106), 26 states have call predecessors, (106), 26 states have return successors, (106), 103 states have call predecessors, (106), 106 states have call successors, (106) Second operand has 6 states, 5 states have (on average 9.6) internal successors, (48), 5 states have internal predecessors, (48), 3 states have call successors, (17), 3 states have call predecessors, (17), 3 states have return successors, (15), 4 states have call predecessors, (15), 3 states have call successors, (15) [2023-11-23 21:15:19,446 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:15:19,448 INFO L93 Difference]: Finished difference Result 1197 states and 1926 transitions. [2023-11-23 21:15:19,449 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-11-23 21:15:19,451 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 9.6) internal successors, (48), 5 states have internal predecessors, (48), 3 states have call successors, (17), 3 states have call predecessors, (17), 3 states have return successors, (15), 4 states have call predecessors, (15), 3 states have call successors, (15) Word has length 87 [2023-11-23 21:15:19,452 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:15:19,483 INFO L225 Difference]: With dead ends: 1197 [2023-11-23 21:15:19,484 INFO L226 Difference]: Without dead ends: 795 [2023-11-23 21:15:19,498 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2023-11-23 21:15:19,508 INFO L413 NwaCegarLoop]: 684 mSDtfsCounter, 629 mSDsluCounter, 2418 mSDsCounter, 0 mSdLazyCounter, 477 mSolverCounterSat, 33 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 644 SdHoareTripleChecker+Valid, 3102 SdHoareTripleChecker+Invalid, 510 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 33 IncrementalHoareTripleChecker+Valid, 477 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2023-11-23 21:15:19,509 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [644 Valid, 3102 Invalid, 510 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [33 Valid, 477 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2023-11-23 21:15:19,532 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 795 states. [2023-11-23 21:15:19,721 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 795 to 744. [2023-11-23 21:15:19,728 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 744 states, 509 states have (on average 1.5658153241650294) internal successors, (797), 539 states have internal predecessors, (797), 190 states have call successors, (190), 47 states have call predecessors, (190), 44 states have return successors, (197), 177 states have call predecessors, (197), 186 states have call successors, (197) [2023-11-23 21:15:19,748 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 744 states to 744 states and 1184 transitions. [2023-11-23 21:15:19,750 INFO L78 Accepts]: Start accepts. Automaton has 744 states and 1184 transitions. Word has length 87 [2023-11-23 21:15:19,751 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:15:19,752 INFO L495 AbstractCegarLoop]: Abstraction has 744 states and 1184 transitions. [2023-11-23 21:15:19,753 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 9.6) internal successors, (48), 5 states have internal predecessors, (48), 3 states have call successors, (17), 3 states have call predecessors, (17), 3 states have return successors, (15), 4 states have call predecessors, (15), 3 states have call successors, (15) [2023-11-23 21:15:19,753 INFO L276 IsEmpty]: Start isEmpty. Operand 744 states and 1184 transitions. [2023-11-23 21:15:19,768 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2023-11-23 21:15:19,768 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:15:19,769 INFO L195 NwaCegarLoop]: trace histogram [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] [2023-11-23 21:15:19,769 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-23 21:15:19,770 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:15:19,771 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:15:19,771 INFO L85 PathProgramCache]: Analyzing trace with hash 1044215575, now seen corresponding path program 1 times [2023-11-23 21:15:19,771 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:15:19,772 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [479289407] [2023-11-23 21:15:19,772 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:15:19,772 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:15:19,861 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:15:20,340 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2023-11-23 21:15:20,342 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:15:20,345 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [479289407] [2023-11-23 21:15:20,346 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [479289407] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:15:20,346 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2138883858] [2023-11-23 21:15:20,347 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:15:20,348 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:15:20,348 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_360e8790-17da-475c-84b4-938ec2f8b4e4/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:15:20,356 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_360e8790-17da-475c-84b4-938ec2f8b4e4/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:15:20,384 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_360e8790-17da-475c-84b4-938ec2f8b4e4/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-23 21:15:20,825 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:15:20,834 INFO L262 TraceCheckSpWp]: Trace formula consists of 1571 conjuncts, 2 conjunts are in the unsatisfiable core [2023-11-23 21:15:20,852 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:15:21,027 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-11-23 21:15:21,028 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-23 21:15:21,028 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2138883858] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:15:21,029 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-23 21:15:21,029 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2023-11-23 21:15:21,034 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [6082665] [2023-11-23 21:15:21,035 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:15:21,036 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-23 21:15:21,036 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:15:21,037 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-23 21:15:21,037 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2023-11-23 21:15:21,038 INFO L87 Difference]: Start difference. First operand 744 states and 1184 transitions. Second operand has 3 states, 3 states have (on average 16.666666666666668) internal successors, (50), 3 states have internal predecessors, (50), 3 states have call successors, (16), 3 states have call predecessors, (16), 3 states have return successors, (14), 3 states have call predecessors, (14), 3 states have call successors, (14) [2023-11-23 21:15:21,341 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:15:21,341 INFO L93 Difference]: Finished difference Result 2108 states and 3421 transitions. [2023-11-23 21:15:21,342 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-23 21:15:21,342 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 16.666666666666668) internal successors, (50), 3 states have internal predecessors, (50), 3 states have call successors, (16), 3 states have call predecessors, (16), 3 states have return successors, (14), 3 states have call predecessors, (14), 3 states have call successors, (14) Word has length 86 [2023-11-23 21:15:21,343 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:15:21,357 INFO L225 Difference]: With dead ends: 2108 [2023-11-23 21:15:21,358 INFO L226 Difference]: Without dead ends: 1376 [2023-11-23 21:15:21,366 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 93 GetRequests, 88 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2023-11-23 21:15:21,367 INFO L413 NwaCegarLoop]: 1015 mSDtfsCounter, 557 mSDsluCounter, 501 mSDsCounter, 0 mSdLazyCounter, 91 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 557 SdHoareTripleChecker+Valid, 1516 SdHoareTripleChecker+Invalid, 98 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 91 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-23 21:15:21,368 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [557 Valid, 1516 Invalid, 98 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 91 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-23 21:15:21,372 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1376 states. [2023-11-23 21:15:21,462 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1376 to 1343. [2023-11-23 21:15:21,466 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1343 states, 926 states have (on average 1.5755939524838012) internal successors, (1459), 985 states have internal predecessors, (1459), 333 states have call successors, (333), 84 states have call predecessors, (333), 83 states have return successors, (360), 313 states have call predecessors, (360), 329 states have call successors, (360) [2023-11-23 21:15:21,493 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1343 states to 1343 states and 2152 transitions. [2023-11-23 21:15:21,494 INFO L78 Accepts]: Start accepts. Automaton has 1343 states and 2152 transitions. Word has length 86 [2023-11-23 21:15:21,495 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:15:21,496 INFO L495 AbstractCegarLoop]: Abstraction has 1343 states and 2152 transitions. [2023-11-23 21:15:21,496 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 16.666666666666668) internal successors, (50), 3 states have internal predecessors, (50), 3 states have call successors, (16), 3 states have call predecessors, (16), 3 states have return successors, (14), 3 states have call predecessors, (14), 3 states have call successors, (14) [2023-11-23 21:15:21,496 INFO L276 IsEmpty]: Start isEmpty. Operand 1343 states and 2152 transitions. [2023-11-23 21:15:21,501 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2023-11-23 21:15:21,501 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:15:21,502 INFO L195 NwaCegarLoop]: trace histogram [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] [2023-11-23 21:15:21,530 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_360e8790-17da-475c-84b4-938ec2f8b4e4/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-11-23 21:15:21,720 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_360e8790-17da-475c-84b4-938ec2f8b4e4/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:15:21,721 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:15:21,721 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:15:21,721 INFO L85 PathProgramCache]: Analyzing trace with hash 1197743293, now seen corresponding path program 1 times [2023-11-23 21:15:21,722 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:15:21,722 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [163248706] [2023-11-23 21:15:21,722 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:15:21,722 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:15:21,776 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:15:22,204 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2023-11-23 21:15:22,204 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:15:22,205 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [163248706] [2023-11-23 21:15:22,205 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [163248706] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:15:22,205 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2075702343] [2023-11-23 21:15:22,205 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:15:22,206 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:15:22,206 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_360e8790-17da-475c-84b4-938ec2f8b4e4/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:15:22,207 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_360e8790-17da-475c-84b4-938ec2f8b4e4/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:15:22,224 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_360e8790-17da-475c-84b4-938ec2f8b4e4/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-23 21:15:22,632 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:15:22,640 INFO L262 TraceCheckSpWp]: Trace formula consists of 1584 conjuncts, 2 conjunts are in the unsatisfiable core [2023-11-23 21:15:22,653 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:15:22,674 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-11-23 21:15:22,675 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-23 21:15:22,675 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2075702343] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:15:22,675 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-23 21:15:22,676 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2023-11-23 21:15:22,676 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1685602191] [2023-11-23 21:15:22,676 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:15:22,677 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-23 21:15:22,677 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:15:22,678 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-23 21:15:22,679 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2023-11-23 21:15:22,679 INFO L87 Difference]: Start difference. First operand 1343 states and 2152 transitions. Second operand has 3 states, 3 states have (on average 17.0) internal successors, (51), 3 states have internal predecessors, (51), 2 states have call successors, (17), 2 states have call predecessors, (17), 2 states have return successors, (15), 2 states have call predecessors, (15), 2 states have call successors, (15) [2023-11-23 21:15:22,953 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:15:22,953 INFO L93 Difference]: Finished difference Result 2708 states and 4383 transitions. [2023-11-23 21:15:22,954 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-23 21:15:22,954 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 17.0) internal successors, (51), 3 states have internal predecessors, (51), 2 states have call successors, (17), 2 states have call predecessors, (17), 2 states have return successors, (15), 2 states have call predecessors, (15), 2 states have call successors, (15) Word has length 88 [2023-11-23 21:15:22,955 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:15:22,968 INFO L225 Difference]: With dead ends: 2708 [2023-11-23 21:15:22,968 INFO L226 Difference]: Without dead ends: 1377 [2023-11-23 21:15:22,984 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 95 GetRequests, 90 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2023-11-23 21:15:22,986 INFO L413 NwaCegarLoop]: 599 mSDtfsCounter, 20 mSDsluCounter, 563 mSDsCounter, 0 mSdLazyCounter, 97 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 25 SdHoareTripleChecker+Valid, 1162 SdHoareTripleChecker+Invalid, 106 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 97 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 21:15:22,987 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [25 Valid, 1162 Invalid, 106 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 97 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 21:15:22,990 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1377 states. [2023-11-23 21:15:23,063 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1377 to 1371. [2023-11-23 21:15:23,067 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1371 states, 950 states have (on average 1.565263157894737) internal successors, (1487), 1009 states have internal predecessors, (1487), 337 states have call successors, (337), 84 states have call predecessors, (337), 83 states have return successors, (364), 317 states have call predecessors, (364), 333 states have call successors, (364) [2023-11-23 21:15:23,089 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1371 states to 1371 states and 2188 transitions. [2023-11-23 21:15:23,090 INFO L78 Accepts]: Start accepts. Automaton has 1371 states and 2188 transitions. Word has length 88 [2023-11-23 21:15:23,090 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:15:23,091 INFO L495 AbstractCegarLoop]: Abstraction has 1371 states and 2188 transitions. [2023-11-23 21:15:23,091 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 17.0) internal successors, (51), 3 states have internal predecessors, (51), 2 states have call successors, (17), 2 states have call predecessors, (17), 2 states have return successors, (15), 2 states have call predecessors, (15), 2 states have call successors, (15) [2023-11-23 21:15:23,091 INFO L276 IsEmpty]: Start isEmpty. Operand 1371 states and 2188 transitions. [2023-11-23 21:15:23,095 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2023-11-23 21:15:23,095 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:15:23,096 INFO L195 NwaCegarLoop]: trace histogram [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] [2023-11-23 21:15:23,126 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_360e8790-17da-475c-84b4-938ec2f8b4e4/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-11-23 21:15:23,312 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_360e8790-17da-475c-84b4-938ec2f8b4e4/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:15:23,313 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:15:23,313 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:15:23,313 INFO L85 PathProgramCache]: Analyzing trace with hash 909059588, now seen corresponding path program 1 times [2023-11-23 21:15:23,313 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:15:23,314 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1299947560] [2023-11-23 21:15:23,314 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:15:23,314 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:15:23,362 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:15:23,745 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2023-11-23 21:15:23,746 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:15:23,746 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1299947560] [2023-11-23 21:15:23,747 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1299947560] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:15:23,749 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [195823752] [2023-11-23 21:15:23,749 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:15:23,751 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:15:23,751 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_360e8790-17da-475c-84b4-938ec2f8b4e4/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:15:23,757 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_360e8790-17da-475c-84b4-938ec2f8b4e4/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:15:23,780 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_360e8790-17da-475c-84b4-938ec2f8b4e4/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-23 21:15:24,128 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:15:24,136 INFO L262 TraceCheckSpWp]: Trace formula consists of 1572 conjuncts, 2 conjunts are in the unsatisfiable core [2023-11-23 21:15:24,144 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:15:24,249 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-11-23 21:15:24,250 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-23 21:15:24,255 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [195823752] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:15:24,255 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-23 21:15:24,255 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2023-11-23 21:15:24,255 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [225218612] [2023-11-23 21:15:24,256 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:15:24,256 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-23 21:15:24,256 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:15:24,257 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-23 21:15:24,258 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2023-11-23 21:15:24,258 INFO L87 Difference]: Start difference. First operand 1371 states and 2188 transitions. Second operand has 3 states, 3 states have (on average 17.0) internal successors, (51), 3 states have internal predecessors, (51), 3 states have call successors, (16), 3 states have call predecessors, (16), 3 states have return successors, (14), 3 states have call predecessors, (14), 3 states have call successors, (14) [2023-11-23 21:15:24,629 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:15:24,629 INFO L93 Difference]: Finished difference Result 3362 states and 5441 transitions. [2023-11-23 21:15:24,629 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-23 21:15:24,630 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 17.0) internal successors, (51), 3 states have internal predecessors, (51), 3 states have call successors, (16), 3 states have call predecessors, (16), 3 states have return successors, (14), 3 states have call predecessors, (14), 3 states have call successors, (14) Word has length 87 [2023-11-23 21:15:24,630 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:15:24,659 INFO L225 Difference]: With dead ends: 3362 [2023-11-23 21:15:24,659 INFO L226 Difference]: Without dead ends: 2003 [2023-11-23 21:15:24,708 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 89 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2023-11-23 21:15:24,710 INFO L413 NwaCegarLoop]: 1055 mSDtfsCounter, 558 mSDsluCounter, 500 mSDsCounter, 0 mSdLazyCounter, 96 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 558 SdHoareTripleChecker+Valid, 1555 SdHoareTripleChecker+Invalid, 102 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 96 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-23 21:15:24,710 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [558 Valid, 1555 Invalid, 102 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 96 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-23 21:15:24,714 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2003 states. [2023-11-23 21:15:24,874 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2003 to 1958. [2023-11-23 21:15:24,880 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1958 states, 1361 states have (on average 1.5716385011021308) internal successors, (2139), 1449 states have internal predecessors, (2139), 477 states have call successors, (477), 118 states have call predecessors, (477), 119 states have return successors, (524), 450 states have call predecessors, (524), 473 states have call successors, (524) [2023-11-23 21:15:24,911 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1958 states to 1958 states and 3140 transitions. [2023-11-23 21:15:24,912 INFO L78 Accepts]: Start accepts. Automaton has 1958 states and 3140 transitions. Word has length 87 [2023-11-23 21:15:24,913 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:15:24,913 INFO L495 AbstractCegarLoop]: Abstraction has 1958 states and 3140 transitions. [2023-11-23 21:15:24,914 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 17.0) internal successors, (51), 3 states have internal predecessors, (51), 3 states have call successors, (16), 3 states have call predecessors, (16), 3 states have return successors, (14), 3 states have call predecessors, (14), 3 states have call successors, (14) [2023-11-23 21:15:24,914 INFO L276 IsEmpty]: Start isEmpty. Operand 1958 states and 3140 transitions. [2023-11-23 21:15:24,920 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2023-11-23 21:15:24,920 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:15:24,921 INFO L195 NwaCegarLoop]: trace histogram [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] [2023-11-23 21:15:24,948 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_360e8790-17da-475c-84b4-938ec2f8b4e4/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-11-23 21:15:25,144 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_360e8790-17da-475c-84b4-938ec2f8b4e4/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:15:25,145 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:15:25,145 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:15:25,145 INFO L85 PathProgramCache]: Analyzing trace with hash 2030264545, now seen corresponding path program 1 times [2023-11-23 21:15:25,146 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:15:25,146 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [688491912] [2023-11-23 21:15:25,146 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:15:25,146 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:15:25,206 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:15:25,553 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2023-11-23 21:15:25,553 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:15:25,554 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [688491912] [2023-11-23 21:15:25,554 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [688491912] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:15:25,554 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1392552955] [2023-11-23 21:15:25,554 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:15:25,555 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:15:25,556 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_360e8790-17da-475c-84b4-938ec2f8b4e4/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:15:25,557 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_360e8790-17da-475c-84b4-938ec2f8b4e4/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:15:25,559 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_360e8790-17da-475c-84b4-938ec2f8b4e4/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-11-23 21:15:25,967 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:15:25,976 INFO L262 TraceCheckSpWp]: Trace formula consists of 1585 conjuncts, 4 conjunts are in the unsatisfiable core [2023-11-23 21:15:25,983 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:15:26,154 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-11-23 21:15:26,155 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-23 21:15:26,155 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1392552955] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:15:26,155 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-23 21:15:26,155 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2023-11-23 21:15:26,156 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1160745315] [2023-11-23 21:15:26,156 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:15:26,157 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-23 21:15:26,157 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:15:26,158 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-23 21:15:26,158 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2023-11-23 21:15:26,158 INFO L87 Difference]: Start difference. First operand 1958 states and 3140 transitions. Second operand has 3 states, 3 states have (on average 16.666666666666668) internal successors, (50), 3 states have internal predecessors, (50), 3 states have call successors, (17), 3 states have call predecessors, (17), 2 states have return successors, (15), 2 states have call predecessors, (15), 3 states have call successors, (15) [2023-11-23 21:15:26,737 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:15:26,738 INFO L93 Difference]: Finished difference Result 5614 states and 9107 transitions. [2023-11-23 21:15:26,738 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-23 21:15:26,739 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 16.666666666666668) internal successors, (50), 3 states have internal predecessors, (50), 3 states have call successors, (17), 3 states have call predecessors, (17), 2 states have return successors, (15), 2 states have call predecessors, (15), 3 states have call successors, (15) Word has length 88 [2023-11-23 21:15:26,739 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:15:26,782 INFO L225 Difference]: With dead ends: 5614 [2023-11-23 21:15:26,782 INFO L226 Difference]: Without dead ends: 3669 [2023-11-23 21:15:26,806 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 89 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2023-11-23 21:15:26,807 INFO L413 NwaCegarLoop]: 627 mSDtfsCounter, 493 mSDsluCounter, 513 mSDsCounter, 0 mSdLazyCounter, 161 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 493 SdHoareTripleChecker+Valid, 1140 SdHoareTripleChecker+Invalid, 182 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 161 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-11-23 21:15:26,807 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [493 Valid, 1140 Invalid, 182 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 161 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-11-23 21:15:26,814 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3669 states. [2023-11-23 21:15:27,069 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3669 to 3641. [2023-11-23 21:15:27,081 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3641 states, 2511 states have (on average 1.5205097570688968) internal successors, (3818), 2685 states have internal predecessors, (3818), 902 states have call successors, (902), 230 states have call predecessors, (902), 227 states have return successors, (1033), 839 states have call predecessors, (1033), 896 states have call successors, (1033) [2023-11-23 21:15:27,135 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3641 states to 3641 states and 5753 transitions. [2023-11-23 21:15:27,136 INFO L78 Accepts]: Start accepts. Automaton has 3641 states and 5753 transitions. Word has length 88 [2023-11-23 21:15:27,137 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:15:27,137 INFO L495 AbstractCegarLoop]: Abstraction has 3641 states and 5753 transitions. [2023-11-23 21:15:27,138 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 16.666666666666668) internal successors, (50), 3 states have internal predecessors, (50), 3 states have call successors, (17), 3 states have call predecessors, (17), 2 states have return successors, (15), 2 states have call predecessors, (15), 3 states have call successors, (15) [2023-11-23 21:15:27,138 INFO L276 IsEmpty]: Start isEmpty. Operand 3641 states and 5753 transitions. [2023-11-23 21:15:27,143 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2023-11-23 21:15:27,144 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:15:27,144 INFO L195 NwaCegarLoop]: trace histogram [3, 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] [2023-11-23 21:15:27,178 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_360e8790-17da-475c-84b4-938ec2f8b4e4/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-11-23 21:15:27,358 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_360e8790-17da-475c-84b4-938ec2f8b4e4/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:15:27,359 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:15:27,359 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:15:27,360 INFO L85 PathProgramCache]: Analyzing trace with hash 1210101479, now seen corresponding path program 1 times [2023-11-23 21:15:27,360 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:15:27,360 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [396042761] [2023-11-23 21:15:27,360 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:15:27,360 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:15:27,422 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:15:27,869 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2023-11-23 21:15:27,869 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:15:27,869 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [396042761] [2023-11-23 21:15:27,869 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [396042761] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:15:27,869 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1341466667] [2023-11-23 21:15:27,869 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:15:27,870 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:15:27,870 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_360e8790-17da-475c-84b4-938ec2f8b4e4/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:15:27,871 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_360e8790-17da-475c-84b4-938ec2f8b4e4/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:15:27,892 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_360e8790-17da-475c-84b4-938ec2f8b4e4/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-11-23 21:15:28,261 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:15:28,269 INFO L262 TraceCheckSpWp]: Trace formula consists of 1580 conjuncts, 9 conjunts are in the unsatisfiable core [2023-11-23 21:15:28,275 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:15:28,394 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-11-23 21:15:28,394 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-23 21:15:28,394 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1341466667] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:15:28,394 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-23 21:15:28,395 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [6] total 10 [2023-11-23 21:15:28,395 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1638019494] [2023-11-23 21:15:28,395 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:15:28,396 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-11-23 21:15:28,396 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:15:28,397 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-11-23 21:15:28,397 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=72, Unknown=0, NotChecked=0, Total=90 [2023-11-23 21:15:28,397 INFO L87 Difference]: Start difference. First operand 3641 states and 5753 transitions. Second operand has 6 states, 5 states have (on average 9.8) internal successors, (49), 5 states have internal predecessors, (49), 4 states have call successors, (18), 3 states have call predecessors, (18), 4 states have return successors, (16), 4 states have call predecessors, (16), 4 states have call successors, (16) [2023-11-23 21:15:29,750 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:15:29,751 INFO L93 Difference]: Finished difference Result 6882 states and 10919 transitions. [2023-11-23 21:15:29,751 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-11-23 21:15:29,752 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 9.8) internal successors, (49), 5 states have internal predecessors, (49), 4 states have call successors, (18), 3 states have call predecessors, (18), 4 states have return successors, (16), 4 states have call predecessors, (16), 4 states have call successors, (16) Word has length 89 [2023-11-23 21:15:29,752 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:15:29,778 INFO L225 Difference]: With dead ends: 6882 [2023-11-23 21:15:29,779 INFO L226 Difference]: Without dead ends: 3253 [2023-11-23 21:15:29,810 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 87 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=26, Invalid=106, Unknown=0, NotChecked=0, Total=132 [2023-11-23 21:15:29,812 INFO L413 NwaCegarLoop]: 602 mSDtfsCounter, 511 mSDsluCounter, 1950 mSDsCounter, 0 mSdLazyCounter, 639 mSolverCounterSat, 26 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 516 SdHoareTripleChecker+Valid, 2552 SdHoareTripleChecker+Invalid, 665 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 26 IncrementalHoareTripleChecker+Valid, 639 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2023-11-23 21:15:29,813 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [516 Valid, 2552 Invalid, 665 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [26 Valid, 639 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2023-11-23 21:15:29,819 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3253 states. [2023-11-23 21:15:29,995 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3253 to 3232. [2023-11-23 21:15:30,003 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3232 states, 2238 states have (on average 1.513851653261841) internal successors, (3388), 2387 states have internal predecessors, (3388), 788 states have call successors, (788), 210 states have call predecessors, (788), 205 states have return successors, (891), 730 states have call predecessors, (891), 782 states have call successors, (891) [2023-11-23 21:15:30,036 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3232 states to 3232 states and 5067 transitions. [2023-11-23 21:15:30,037 INFO L78 Accepts]: Start accepts. Automaton has 3232 states and 5067 transitions. Word has length 89 [2023-11-23 21:15:30,039 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:15:30,039 INFO L495 AbstractCegarLoop]: Abstraction has 3232 states and 5067 transitions. [2023-11-23 21:15:30,040 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 9.8) internal successors, (49), 5 states have internal predecessors, (49), 4 states have call successors, (18), 3 states have call predecessors, (18), 4 states have return successors, (16), 4 states have call predecessors, (16), 4 states have call successors, (16) [2023-11-23 21:15:30,040 INFO L276 IsEmpty]: Start isEmpty. Operand 3232 states and 5067 transitions. [2023-11-23 21:15:30,042 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2023-11-23 21:15:30,043 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:15:30,043 INFO L195 NwaCegarLoop]: trace histogram [3, 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] [2023-11-23 21:15:30,073 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_360e8790-17da-475c-84b4-938ec2f8b4e4/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-11-23 21:15:30,268 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_360e8790-17da-475c-84b4-938ec2f8b4e4/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:15:30,268 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:15:30,269 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:15:30,269 INFO L85 PathProgramCache]: Analyzing trace with hash -1714611040, now seen corresponding path program 1 times [2023-11-23 21:15:30,270 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:15:30,270 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1456365254] [2023-11-23 21:15:30,270 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:15:30,270 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:15:30,329 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:15:31,133 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2023-11-23 21:15:31,133 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:15:31,133 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1456365254] [2023-11-23 21:15:31,134 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1456365254] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:15:31,134 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [680619034] [2023-11-23 21:15:31,134 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:15:31,134 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:15:31,135 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_360e8790-17da-475c-84b4-938ec2f8b4e4/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:15:31,137 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_360e8790-17da-475c-84b4-938ec2f8b4e4/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:15:31,160 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_360e8790-17da-475c-84b4-938ec2f8b4e4/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-11-23 21:15:31,490 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:15:31,497 INFO L262 TraceCheckSpWp]: Trace formula consists of 1594 conjuncts, 17 conjunts are in the unsatisfiable core [2023-11-23 21:15:31,504 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:15:31,859 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 13 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-11-23 21:15:31,860 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-23 21:15:31,860 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [680619034] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:15:31,860 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-23 21:15:31,860 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [10] total 15 [2023-11-23 21:15:31,861 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2060196170] [2023-11-23 21:15:31,861 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:15:31,861 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-11-23 21:15:31,862 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:15:31,862 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-11-23 21:15:31,863 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=175, Unknown=0, NotChecked=0, Total=210 [2023-11-23 21:15:31,863 INFO L87 Difference]: Start difference. First operand 3232 states and 5067 transitions. Second operand has 7 states, 6 states have (on average 9.166666666666666) internal successors, (55), 5 states have internal predecessors, (55), 3 states have call successors, (20), 3 states have call predecessors, (20), 3 states have return successors, (18), 3 states have call predecessors, (18), 3 states have call successors, (18) [2023-11-23 21:15:34,018 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:15:34,018 INFO L93 Difference]: Finished difference Result 6813 states and 10669 transitions. [2023-11-23 21:15:34,019 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-11-23 21:15:34,019 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 9.166666666666666) internal successors, (55), 5 states have internal predecessors, (55), 3 states have call successors, (20), 3 states have call predecessors, (20), 3 states have return successors, (18), 3 states have call predecessors, (18), 3 states have call successors, (18) Word has length 94 [2023-11-23 21:15:34,020 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:15:34,054 INFO L225 Difference]: With dead ends: 6813 [2023-11-23 21:15:34,055 INFO L226 Difference]: Without dead ends: 3593 [2023-11-23 21:15:34,080 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 91 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=45, Invalid=227, Unknown=0, NotChecked=0, Total=272 [2023-11-23 21:15:34,081 INFO L413 NwaCegarLoop]: 608 mSDtfsCounter, 1311 mSDsluCounter, 1445 mSDsCounter, 0 mSdLazyCounter, 1356 mSolverCounterSat, 133 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1314 SdHoareTripleChecker+Valid, 2053 SdHoareTripleChecker+Invalid, 1489 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 133 IncrementalHoareTripleChecker+Valid, 1356 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.7s IncrementalHoareTripleChecker+Time [2023-11-23 21:15:34,081 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1314 Valid, 2053 Invalid, 1489 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [133 Valid, 1356 Invalid, 0 Unknown, 0 Unchecked, 1.7s Time] [2023-11-23 21:15:34,088 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3593 states. [2023-11-23 21:15:34,345 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3593 to 3572. [2023-11-23 21:15:34,356 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3572 states, 2494 states have (on average 1.4939855653568566) internal successors, (3726), 2651 states have internal predecessors, (3726), 848 states have call successors, (848), 238 states have call predecessors, (848), 229 states have return successors, (953), 778 states have call predecessors, (953), 842 states have call successors, (953) [2023-11-23 21:15:34,402 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3572 states to 3572 states and 5527 transitions. [2023-11-23 21:15:34,403 INFO L78 Accepts]: Start accepts. Automaton has 3572 states and 5527 transitions. Word has length 94 [2023-11-23 21:15:34,404 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:15:34,404 INFO L495 AbstractCegarLoop]: Abstraction has 3572 states and 5527 transitions. [2023-11-23 21:15:34,405 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 9.166666666666666) internal successors, (55), 5 states have internal predecessors, (55), 3 states have call successors, (20), 3 states have call predecessors, (20), 3 states have return successors, (18), 3 states have call predecessors, (18), 3 states have call successors, (18) [2023-11-23 21:15:34,405 INFO L276 IsEmpty]: Start isEmpty. Operand 3572 states and 5527 transitions. [2023-11-23 21:15:34,408 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2023-11-23 21:15:34,409 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:15:34,409 INFO L195 NwaCegarLoop]: trace histogram [3, 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] [2023-11-23 21:15:34,443 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_360e8790-17da-475c-84b4-938ec2f8b4e4/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2023-11-23 21:15:34,624 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_360e8790-17da-475c-84b4-938ec2f8b4e4/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:15:34,624 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:15:34,625 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:15:34,625 INFO L85 PathProgramCache]: Analyzing trace with hash 573849948, now seen corresponding path program 1 times [2023-11-23 21:15:34,625 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:15:34,625 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1970134720] [2023-11-23 21:15:34,626 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:15:34,626 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:15:34,691 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:15:35,482 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2023-11-23 21:15:35,483 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:15:35,483 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1970134720] [2023-11-23 21:15:35,483 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1970134720] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:15:35,483 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1396704658] [2023-11-23 21:15:35,484 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:15:35,484 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:15:35,484 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_360e8790-17da-475c-84b4-938ec2f8b4e4/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:15:35,485 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_360e8790-17da-475c-84b4-938ec2f8b4e4/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:15:35,518 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_360e8790-17da-475c-84b4-938ec2f8b4e4/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-11-23 21:15:35,985 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:15:35,994 INFO L262 TraceCheckSpWp]: Trace formula consists of 1608 conjuncts, 7 conjunts are in the unsatisfiable core [2023-11-23 21:15:36,000 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:15:36,078 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 12 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-11-23 21:15:36,079 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-23 21:15:36,079 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1396704658] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:15:36,079 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-23 21:15:36,079 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [10] total 14 [2023-11-23 21:15:36,079 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1082478229] [2023-11-23 21:15:36,080 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:15:36,080 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-11-23 21:15:36,080 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:15:36,081 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-11-23 21:15:36,081 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=154, Unknown=0, NotChecked=0, Total=182 [2023-11-23 21:15:36,081 INFO L87 Difference]: Start difference. First operand 3572 states and 5527 transitions. Second operand has 6 states, 6 states have (on average 9.5) internal successors, (57), 5 states have internal predecessors, (57), 2 states have call successors, (21), 2 states have call predecessors, (21), 3 states have return successors, (19), 3 states have call predecessors, (19), 2 states have call successors, (19) [2023-11-23 21:15:36,779 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:15:36,780 INFO L93 Difference]: Finished difference Result 7163 states and 11292 transitions. [2023-11-23 21:15:36,780 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-23 21:15:36,781 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 9.5) internal successors, (57), 5 states have internal predecessors, (57), 2 states have call successors, (21), 2 states have call predecessors, (21), 3 states have return successors, (19), 3 states have call predecessors, (19), 2 states have call successors, (19) Word has length 99 [2023-11-23 21:15:36,781 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:15:36,831 INFO L225 Difference]: With dead ends: 7163 [2023-11-23 21:15:36,831 INFO L226 Difference]: Without dead ends: 4412 [2023-11-23 21:15:36,846 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 97 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=32, Invalid=178, Unknown=0, NotChecked=0, Total=210 [2023-11-23 21:15:36,847 INFO L413 NwaCegarLoop]: 610 mSDtfsCounter, 139 mSDsluCounter, 2409 mSDsCounter, 0 mSdLazyCounter, 192 mSolverCounterSat, 90 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 139 SdHoareTripleChecker+Valid, 3019 SdHoareTripleChecker+Invalid, 282 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 90 IncrementalHoareTripleChecker+Valid, 192 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-11-23 21:15:36,848 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [139 Valid, 3019 Invalid, 282 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [90 Valid, 192 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-11-23 21:15:36,856 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4412 states. [2023-11-23 21:15:37,212 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4412 to 3995. [2023-11-23 21:15:37,242 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3995 states, 2732 states have (on average 1.4860907759882869) internal successors, (4060), 2948 states have internal predecessors, (4060), 1018 states have call successors, (1018), 238 states have call predecessors, (1018), 244 states have return successors, (1169), 946 states have call predecessors, (1169), 1012 states have call successors, (1169) [2023-11-23 21:15:37,307 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3995 states to 3995 states and 6247 transitions. [2023-11-23 21:15:37,308 INFO L78 Accepts]: Start accepts. Automaton has 3995 states and 6247 transitions. Word has length 99 [2023-11-23 21:15:37,309 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:15:37,310 INFO L495 AbstractCegarLoop]: Abstraction has 3995 states and 6247 transitions. [2023-11-23 21:15:37,311 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 9.5) internal successors, (57), 5 states have internal predecessors, (57), 2 states have call successors, (21), 2 states have call predecessors, (21), 3 states have return successors, (19), 3 states have call predecessors, (19), 2 states have call successors, (19) [2023-11-23 21:15:37,311 INFO L276 IsEmpty]: Start isEmpty. Operand 3995 states and 6247 transitions. [2023-11-23 21:15:37,318 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2023-11-23 21:15:37,318 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:15:37,318 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 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] [2023-11-23 21:15:37,353 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_360e8790-17da-475c-84b4-938ec2f8b4e4/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2023-11-23 21:15:37,531 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_360e8790-17da-475c-84b4-938ec2f8b4e4/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:15:37,531 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:15:37,532 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:15:37,532 INFO L85 PathProgramCache]: Analyzing trace with hash -2016524804, now seen corresponding path program 1 times [2023-11-23 21:15:37,532 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:15:37,532 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1411270989] [2023-11-23 21:15:37,532 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:15:37,533 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:15:37,613 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:15:38,566 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2023-11-23 21:15:38,567 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:15:38,567 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1411270989] [2023-11-23 21:15:38,567 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1411270989] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:15:38,567 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [718469292] [2023-11-23 21:15:38,567 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:15:38,568 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:15:38,568 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_360e8790-17da-475c-84b4-938ec2f8b4e4/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:15:38,569 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_360e8790-17da-475c-84b4-938ec2f8b4e4/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:15:38,572 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_360e8790-17da-475c-84b4-938ec2f8b4e4/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-11-23 21:15:38,902 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:15:38,908 INFO L262 TraceCheckSpWp]: Trace formula consists of 1619 conjuncts, 17 conjunts are in the unsatisfiable core [2023-11-23 21:15:38,914 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:15:39,213 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2023-11-23 21:15:39,213 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 21:15:39,576 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2023-11-23 21:15:39,577 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [718469292] provided 1 perfect and 1 imperfect interpolant sequences [2023-11-23 21:15:39,577 INFO L185 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2023-11-23 21:15:39,577 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [10, 9] total 20 [2023-11-23 21:15:39,578 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [892253395] [2023-11-23 21:15:39,578 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:15:39,578 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2023-11-23 21:15:39,578 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:15:39,579 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2023-11-23 21:15:39,580 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=328, Unknown=0, NotChecked=0, Total=380 [2023-11-23 21:15:39,580 INFO L87 Difference]: Start difference. First operand 3995 states and 6247 transitions. Second operand has 9 states, 8 states have (on average 6.75) internal successors, (54), 8 states have internal predecessors, (54), 4 states have call successors, (21), 4 states have call predecessors, (21), 4 states have return successors, (19), 4 states have call predecessors, (19), 3 states have call successors, (19) [2023-11-23 21:15:43,923 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:15:43,923 INFO L93 Difference]: Finished difference Result 10683 states and 17206 transitions. [2023-11-23 21:15:43,924 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2023-11-23 21:15:43,925 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 6.75) internal successors, (54), 8 states have internal predecessors, (54), 4 states have call successors, (21), 4 states have call predecessors, (21), 4 states have return successors, (19), 4 states have call predecessors, (19), 3 states have call successors, (19) Word has length 103 [2023-11-23 21:15:43,925 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:15:44,018 INFO L225 Difference]: With dead ends: 10683 [2023-11-23 21:15:44,018 INFO L226 Difference]: Without dead ends: 7875 [2023-11-23 21:15:44,043 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 233 GetRequests, 201 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 139 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=160, Invalid=962, Unknown=0, NotChecked=0, Total=1122 [2023-11-23 21:15:44,046 INFO L413 NwaCegarLoop]: 597 mSDtfsCounter, 1896 mSDsluCounter, 2322 mSDsCounter, 0 mSdLazyCounter, 2135 mSolverCounterSat, 839 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1980 SdHoareTripleChecker+Valid, 2919 SdHoareTripleChecker+Invalid, 2974 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 839 IncrementalHoareTripleChecker+Valid, 2135 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.3s IncrementalHoareTripleChecker+Time [2023-11-23 21:15:44,047 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1980 Valid, 2919 Invalid, 2974 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [839 Valid, 2135 Invalid, 0 Unknown, 0 Unchecked, 3.3s Time] [2023-11-23 21:15:44,060 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7875 states. [2023-11-23 21:15:44,721 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7875 to 6984. [2023-11-23 21:15:44,736 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 6984 states, 4982 states have (on average 1.4939783219590526) internal successors, (7443), 5240 states have internal predecessors, (7443), 1503 states have call successors, (1503), 468 states have call predecessors, (1503), 498 states have return successors, (1996), 1419 states have call predecessors, (1996), 1495 states have call successors, (1996) [2023-11-23 21:15:44,838 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6984 states to 6984 states and 10942 transitions. [2023-11-23 21:15:44,840 INFO L78 Accepts]: Start accepts. Automaton has 6984 states and 10942 transitions. Word has length 103 [2023-11-23 21:15:44,840 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:15:44,841 INFO L495 AbstractCegarLoop]: Abstraction has 6984 states and 10942 transitions. [2023-11-23 21:15:44,841 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 8 states have (on average 6.75) internal successors, (54), 8 states have internal predecessors, (54), 4 states have call successors, (21), 4 states have call predecessors, (21), 4 states have return successors, (19), 4 states have call predecessors, (19), 3 states have call successors, (19) [2023-11-23 21:15:44,841 INFO L276 IsEmpty]: Start isEmpty. Operand 6984 states and 10942 transitions. [2023-11-23 21:15:44,846 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2023-11-23 21:15:44,846 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:15:44,846 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 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, 1] [2023-11-23 21:15:44,875 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_360e8790-17da-475c-84b4-938ec2f8b4e4/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2023-11-23 21:15:45,063 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_360e8790-17da-475c-84b4-938ec2f8b4e4/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:15:45,063 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:15:45,064 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:15:45,064 INFO L85 PathProgramCache]: Analyzing trace with hash 326928888, now seen corresponding path program 1 times [2023-11-23 21:15:45,064 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:15:45,064 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1840209669] [2023-11-23 21:15:45,064 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:15:45,065 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:15:45,121 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:15:45,934 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2023-11-23 21:15:45,934 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:15:45,934 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1840209669] [2023-11-23 21:15:45,935 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1840209669] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:15:45,935 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1732062312] [2023-11-23 21:15:45,935 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:15:45,935 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:15:45,935 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_360e8790-17da-475c-84b4-938ec2f8b4e4/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:15:45,936 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_360e8790-17da-475c-84b4-938ec2f8b4e4/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:15:45,940 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_360e8790-17da-475c-84b4-938ec2f8b4e4/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2023-11-23 21:15:46,334 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:15:46,342 INFO L262 TraceCheckSpWp]: Trace formula consists of 1636 conjuncts, 7 conjunts are in the unsatisfiable core [2023-11-23 21:15:46,349 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:15:46,555 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2023-11-23 21:15:46,555 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-23 21:15:46,556 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1732062312] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:15:46,556 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-23 21:15:46,556 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [10] total 13 [2023-11-23 21:15:46,557 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1873782161] [2023-11-23 21:15:46,557 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:15:46,558 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-23 21:15:46,559 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:15:46,559 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-23 21:15:46,560 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=129, Unknown=0, NotChecked=0, Total=156 [2023-11-23 21:15:46,560 INFO L87 Difference]: Start difference. First operand 6984 states and 10942 transitions. Second operand has 5 states, 5 states have (on average 11.2) internal successors, (56), 5 states have internal predecessors, (56), 4 states have call successors, (22), 3 states have call predecessors, (22), 4 states have return successors, (20), 3 states have call predecessors, (20), 4 states have call successors, (20) [2023-11-23 21:15:47,898 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:15:47,898 INFO L93 Difference]: Finished difference Result 12795 states and 20068 transitions. [2023-11-23 21:15:47,899 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-23 21:15:47,899 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 11.2) internal successors, (56), 5 states have internal predecessors, (56), 4 states have call successors, (22), 3 states have call predecessors, (22), 4 states have return successors, (20), 3 states have call predecessors, (20), 4 states have call successors, (20) Word has length 107 [2023-11-23 21:15:47,900 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:15:47,972 INFO L225 Difference]: With dead ends: 12795 [2023-11-23 21:15:47,972 INFO L226 Difference]: Without dead ends: 7006 [2023-11-23 21:15:48,012 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 120 GetRequests, 107 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=35, Invalid=175, Unknown=0, NotChecked=0, Total=210 [2023-11-23 21:15:48,013 INFO L413 NwaCegarLoop]: 650 mSDtfsCounter, 417 mSDsluCounter, 1694 mSDsCounter, 0 mSdLazyCounter, 370 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 417 SdHoareTripleChecker+Valid, 2344 SdHoareTripleChecker+Invalid, 377 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 370 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2023-11-23 21:15:48,014 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [417 Valid, 2344 Invalid, 377 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 370 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2023-11-23 21:15:48,026 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7006 states. [2023-11-23 21:15:48,715 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7006 to 6984. [2023-11-23 21:15:48,728 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 6984 states, 4982 states have (on average 1.4939783219590526) internal successors, (7443), 5240 states have internal predecessors, (7443), 1503 states have call successors, (1503), 468 states have call predecessors, (1503), 498 states have return successors, (1988), 1419 states have call predecessors, (1988), 1495 states have call successors, (1988) [2023-11-23 21:15:48,806 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6984 states to 6984 states and 10934 transitions. [2023-11-23 21:15:48,808 INFO L78 Accepts]: Start accepts. Automaton has 6984 states and 10934 transitions. Word has length 107 [2023-11-23 21:15:48,809 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:15:48,810 INFO L495 AbstractCegarLoop]: Abstraction has 6984 states and 10934 transitions. [2023-11-23 21:15:48,810 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 11.2) internal successors, (56), 5 states have internal predecessors, (56), 4 states have call successors, (22), 3 states have call predecessors, (22), 4 states have return successors, (20), 3 states have call predecessors, (20), 4 states have call successors, (20) [2023-11-23 21:15:48,810 INFO L276 IsEmpty]: Start isEmpty. Operand 6984 states and 10934 transitions. [2023-11-23 21:15:48,817 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 135 [2023-11-23 21:15:48,817 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:15:48,818 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 3, 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, 1, 1] [2023-11-23 21:15:48,851 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_360e8790-17da-475c-84b4-938ec2f8b4e4/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2023-11-23 21:15:49,042 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_360e8790-17da-475c-84b4-938ec2f8b4e4/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2023-11-23 21:15:49,043 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:15:49,043 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:15:49,043 INFO L85 PathProgramCache]: Analyzing trace with hash 951929086, now seen corresponding path program 1 times [2023-11-23 21:15:49,043 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:15:49,044 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [52794160] [2023-11-23 21:15:49,044 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:15:49,044 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:15:49,138 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:15:49,984 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2023-11-23 21:15:49,984 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:15:49,985 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [52794160] [2023-11-23 21:15:49,985 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [52794160] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:15:49,985 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1318905030] [2023-11-23 21:15:49,985 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:15:49,986 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:15:49,986 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_360e8790-17da-475c-84b4-938ec2f8b4e4/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:15:49,987 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_360e8790-17da-475c-84b4-938ec2f8b4e4/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:15:50,012 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_360e8790-17da-475c-84b4-938ec2f8b4e4/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2023-11-23 21:15:50,444 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:15:50,454 INFO L262 TraceCheckSpWp]: Trace formula consists of 1732 conjuncts, 33 conjunts are in the unsatisfiable core [2023-11-23 21:15:50,470 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:15:50,944 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 46 trivial. 0 not checked. [2023-11-23 21:15:50,945 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 21:15:51,540 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 47 trivial. 0 not checked. [2023-11-23 21:15:51,540 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1318905030] provided 1 perfect and 1 imperfect interpolant sequences [2023-11-23 21:15:51,540 INFO L185 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2023-11-23 21:15:51,540 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [10, 11] total 27 [2023-11-23 21:15:51,541 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [102398748] [2023-11-23 21:15:51,541 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:15:51,541 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2023-11-23 21:15:51,541 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:15:51,542 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2023-11-23 21:15:51,543 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=76, Invalid=626, Unknown=0, NotChecked=0, Total=702 [2023-11-23 21:15:51,543 INFO L87 Difference]: Start difference. First operand 6984 states and 10934 transitions. Second operand has 11 states, 9 states have (on average 6.777777777777778) internal successors, (61), 9 states have internal predecessors, (61), 5 states have call successors, (25), 4 states have call predecessors, (25), 5 states have return successors, (23), 5 states have call predecessors, (23), 4 states have call successors, (23)