./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/systemc/token_ring.03.cil-2.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version cf1a7837 Calling Ultimate with: /usr/lib/jvm/java-1.11.0-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7185a143-1d39-47a5-9e1d-afd264039b53/bin/utaipan-verify-NcY6lQBIFX/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7185a143-1d39-47a5-9e1d-afd264039b53/bin/utaipan-verify-NcY6lQBIFX/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7185a143-1d39-47a5-9e1d-afd264039b53/bin/utaipan-verify-NcY6lQBIFX/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7185a143-1d39-47a5-9e1d-afd264039b53/bin/utaipan-verify-NcY6lQBIFX/config/TaipanReach.xml -i ../../sv-benchmarks/c/systemc/token_ring.03.cil-2.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7185a143-1d39-47a5-9e1d-afd264039b53/bin/utaipan-verify-NcY6lQBIFX/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7185a143-1d39-47a5-9e1d-afd264039b53/bin/utaipan-verify-NcY6lQBIFX --witnessprinter.witness.filename witness --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 4996a252ab084c920e1b9a19c3119ce328d4cb97d6d45029062c9dac50449e19 --- Real Ultimate output --- This is Ultimate 0.2.3-dev-cf1a783 [2023-11-12 00:41:55,379 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-12 00:41:55,518 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7185a143-1d39-47a5-9e1d-afd264039b53/bin/utaipan-verify-NcY6lQBIFX/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-11-12 00:41:55,526 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-12 00:41:55,527 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-12 00:41:55,567 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-12 00:41:55,568 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-12 00:41:55,569 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-12 00:41:55,570 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-12 00:41:55,575 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-12 00:41:55,575 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-12 00:41:55,576 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-12 00:41:55,576 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-12 00:41:55,578 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-12 00:41:55,579 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-12 00:41:55,579 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-12 00:41:55,580 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-12 00:41:55,581 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-12 00:41:55,581 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-12 00:41:55,582 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-12 00:41:55,582 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-12 00:41:55,583 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-12 00:41:55,584 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-12 00:41:55,585 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-11-12 00:41:55,585 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-12 00:41:55,586 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-12 00:41:55,586 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-12 00:41:55,587 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-12 00:41:55,587 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-11-12 00:41:55,588 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-12 00:41:55,589 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-11-12 00:41:55,590 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-12 00:41:55,590 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-11-12 00:41:55,591 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-12 00:41:55,591 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-12 00:41:55,591 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-12 00:41:55,592 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-12 00:41:55,592 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-12 00:41:55,592 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-12 00:41:55,593 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-11-12 00:41:55,593 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-12 00:41:55,594 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-12 00:41:55,594 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-11-12 00:41:55,594 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-12 00:41:55,595 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-12 00:41:55,595 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_7185a143-1d39-47a5-9e1d-afd264039b53/bin/utaipan-verify-NcY6lQBIFX/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7185a143-1d39-47a5-9e1d-afd264039b53/bin/utaipan-verify-NcY6lQBIFX Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 4996a252ab084c920e1b9a19c3119ce328d4cb97d6d45029062c9dac50449e19 [2023-11-12 00:41:55,956 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-12 00:41:55,991 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-12 00:41:55,994 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-12 00:41:55,995 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-12 00:41:55,996 INFO L274 PluginConnector]: CDTParser initialized [2023-11-12 00:41:55,998 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7185a143-1d39-47a5-9e1d-afd264039b53/bin/utaipan-verify-NcY6lQBIFX/../../sv-benchmarks/c/systemc/token_ring.03.cil-2.c [2023-11-12 00:41:59,174 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-12 00:41:59,423 INFO L384 CDTParser]: Found 1 translation units. [2023-11-12 00:41:59,424 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7185a143-1d39-47a5-9e1d-afd264039b53/sv-benchmarks/c/systemc/token_ring.03.cil-2.c [2023-11-12 00:41:59,452 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7185a143-1d39-47a5-9e1d-afd264039b53/bin/utaipan-verify-NcY6lQBIFX/data/00f262c07/092cd103b84344eca94ff8db8af0f931/FLAG2987458e7 [2023-11-12 00:41:59,475 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7185a143-1d39-47a5-9e1d-afd264039b53/bin/utaipan-verify-NcY6lQBIFX/data/00f262c07/092cd103b84344eca94ff8db8af0f931 [2023-11-12 00:41:59,485 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-12 00:41:59,486 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-12 00:41:59,492 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-12 00:41:59,492 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-12 00:41:59,499 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-12 00:41:59,500 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 12.11 12:41:59" (1/1) ... [2023-11-12 00:41:59,501 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3d55c530 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:41:59, skipping insertion in model container [2023-11-12 00:41:59,502 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 12.11 12:41:59" (1/1) ... [2023-11-12 00:41:59,564 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-12 00:41:59,728 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_7185a143-1d39-47a5-9e1d-afd264039b53/sv-benchmarks/c/systemc/token_ring.03.cil-2.c[671,684] [2023-11-12 00:41:59,795 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-12 00:41:59,807 INFO L202 MainTranslator]: Completed pre-run [2023-11-12 00:41:59,818 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_7185a143-1d39-47a5-9e1d-afd264039b53/sv-benchmarks/c/systemc/token_ring.03.cil-2.c[671,684] [2023-11-12 00:41:59,861 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-12 00:41:59,880 INFO L206 MainTranslator]: Completed translation [2023-11-12 00:41:59,880 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:41:59 WrapperNode [2023-11-12 00:41:59,881 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-12 00:41:59,882 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-12 00:41:59,882 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-12 00:41:59,882 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-12 00:41:59,890 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:41:59" (1/1) ... [2023-11-12 00:41:59,900 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:41:59" (1/1) ... [2023-11-12 00:41:59,935 INFO L138 Inliner]: procedures = 34, calls = 40, calls flagged for inlining = 18, calls inlined = 18, statements flattened = 339 [2023-11-12 00:41:59,936 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-12 00:41:59,937 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-12 00:41:59,937 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-12 00:41:59,937 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-12 00:41:59,947 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:41:59" (1/1) ... [2023-11-12 00:41:59,947 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:41:59" (1/1) ... [2023-11-12 00:41:59,951 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:41:59" (1/1) ... [2023-11-12 00:41:59,952 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:41:59" (1/1) ... [2023-11-12 00:41:59,960 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:41:59" (1/1) ... [2023-11-12 00:41:59,968 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:41:59" (1/1) ... [2023-11-12 00:41:59,970 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:41:59" (1/1) ... [2023-11-12 00:41:59,973 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:41:59" (1/1) ... [2023-11-12 00:41:59,977 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-12 00:41:59,979 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-12 00:41:59,979 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-12 00:41:59,979 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-12 00:41:59,980 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:41:59" (1/1) ... [2023-11-12 00:41:59,987 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-12 00:42:00,003 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7185a143-1d39-47a5-9e1d-afd264039b53/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:42:00,021 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7185a143-1d39-47a5-9e1d-afd264039b53/bin/utaipan-verify-NcY6lQBIFX/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-12 00:42:00,057 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7185a143-1d39-47a5-9e1d-afd264039b53/bin/utaipan-verify-NcY6lQBIFX/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-12 00:42:00,081 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-12 00:42:00,081 INFO L130 BoogieDeclarations]: Found specification of procedure fire_delta_events [2023-11-12 00:42:00,081 INFO L138 BoogieDeclarations]: Found implementation of procedure fire_delta_events [2023-11-12 00:42:00,081 INFO L130 BoogieDeclarations]: Found specification of procedure activate_threads [2023-11-12 00:42:00,081 INFO L138 BoogieDeclarations]: Found implementation of procedure activate_threads [2023-11-12 00:42:00,081 INFO L130 BoogieDeclarations]: Found specification of procedure immediate_notify [2023-11-12 00:42:00,082 INFO L138 BoogieDeclarations]: Found implementation of procedure immediate_notify [2023-11-12 00:42:00,082 INFO L130 BoogieDeclarations]: Found specification of procedure exists_runnable_thread [2023-11-12 00:42:00,082 INFO L138 BoogieDeclarations]: Found implementation of procedure exists_runnable_thread [2023-11-12 00:42:00,082 INFO L130 BoogieDeclarations]: Found specification of procedure reset_delta_events [2023-11-12 00:42:00,082 INFO L138 BoogieDeclarations]: Found implementation of procedure reset_delta_events [2023-11-12 00:42:00,082 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-12 00:42:00,083 INFO L130 BoogieDeclarations]: Found specification of procedure update_channels [2023-11-12 00:42:00,083 INFO L138 BoogieDeclarations]: Found implementation of procedure update_channels [2023-11-12 00:42:00,083 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-12 00:42:00,083 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-12 00:42:00,161 INFO L236 CfgBuilder]: Building ICFG [2023-11-12 00:42:00,163 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-12 00:42:00,635 INFO L277 CfgBuilder]: Performing block encoding [2023-11-12 00:42:00,942 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-12 00:42:00,942 INFO L302 CfgBuilder]: Removed 6 assume(true) statements. [2023-11-12 00:42:00,945 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 12.11 12:42:00 BoogieIcfgContainer [2023-11-12 00:42:00,945 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-12 00:42:00,948 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-12 00:42:00,949 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-12 00:42:00,952 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-12 00:42:00,952 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 12.11 12:41:59" (1/3) ... [2023-11-12 00:42:00,953 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7a0c8e56 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 12.11 12:42:00, skipping insertion in model container [2023-11-12 00:42:00,954 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:41:59" (2/3) ... [2023-11-12 00:42:00,955 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7a0c8e56 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 12.11 12:42:00, skipping insertion in model container [2023-11-12 00:42:00,955 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 12.11 12:42:00" (3/3) ... [2023-11-12 00:42:00,956 INFO L112 eAbstractionObserver]: Analyzing ICFG token_ring.03.cil-2.c [2023-11-12 00:42:00,977 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-12 00:42:00,977 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-11-12 00:42:01,036 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-12 00:42:01,043 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;@17249884, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-12 00:42:01,043 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-11-12 00:42:01,048 INFO L276 IsEmpty]: Start isEmpty. Operand has 93 states, 68 states have (on average 1.4705882352941178) internal successors, (100), 70 states have internal predecessors, (100), 17 states have call successors, (17), 6 states have call predecessors, (17), 6 states have return successors, (17), 17 states have call predecessors, (17), 17 states have call successors, (17) [2023-11-12 00:42:01,058 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2023-11-12 00:42:01,058 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:42:01,059 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:42:01,059 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 00:42:01,065 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:42:01,065 INFO L85 PathProgramCache]: Analyzing trace with hash 2071427691, now seen corresponding path program 1 times [2023-11-12 00:42:01,075 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:42:01,076 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1879694079] [2023-11-12 00:42:01,076 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:42:01,076 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:42:01,200 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:42:01,544 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 00:42:01,546 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:42:01,546 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1879694079] [2023-11-12 00:42:01,547 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1879694079] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 00:42:01,547 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-12 00:42:01,548 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-11-12 00:42:01,549 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1407717770] [2023-11-12 00:42:01,550 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 00:42:01,555 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-12 00:42:01,556 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:42:01,599 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-12 00:42:01,600 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-12 00:42:01,604 INFO L87 Difference]: Start difference. First operand has 93 states, 68 states have (on average 1.4705882352941178) internal successors, (100), 70 states have internal predecessors, (100), 17 states have call successors, (17), 6 states have call predecessors, (17), 6 states have return successors, (17), 17 states have call predecessors, (17), 17 states have call successors, (17) Second operand has 4 states, 4 states have (on average 7.25) internal successors, (29), 4 states have internal predecessors, (29), 2 states have call successors, (5), 1 states have call predecessors, (5), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2023-11-12 00:42:02,026 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:42:02,026 INFO L93 Difference]: Finished difference Result 263 states and 385 transitions. [2023-11-12 00:42:02,028 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-12 00:42:02,029 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 7.25) internal successors, (29), 4 states have internal predecessors, (29), 2 states have call successors, (5), 1 states have call predecessors, (5), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) Word has length 39 [2023-11-12 00:42:02,029 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:42:02,044 INFO L225 Difference]: With dead ends: 263 [2023-11-12 00:42:02,045 INFO L226 Difference]: Without dead ends: 171 [2023-11-12 00:42:02,051 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-12 00:42:02,055 INFO L413 NwaCegarLoop]: 192 mSDtfsCounter, 223 mSDsluCounter, 130 mSDsCounter, 0 mSdLazyCounter, 160 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 223 SdHoareTripleChecker+Valid, 322 SdHoareTripleChecker+Invalid, 171 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 160 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-11-12 00:42:02,057 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [223 Valid, 322 Invalid, 171 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 160 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-11-12 00:42:02,077 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 171 states. [2023-11-12 00:42:02,144 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 171 to 170. [2023-11-12 00:42:02,148 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 170 states, 127 states have (on average 1.3858267716535433) internal successors, (176), 129 states have internal predecessors, (176), 30 states have call successors, (30), 12 states have call predecessors, (30), 12 states have return successors, (30), 29 states have call predecessors, (30), 30 states have call successors, (30) [2023-11-12 00:42:02,156 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 170 states to 170 states and 236 transitions. [2023-11-12 00:42:02,157 INFO L78 Accepts]: Start accepts. Automaton has 170 states and 236 transitions. Word has length 39 [2023-11-12 00:42:02,158 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:42:02,159 INFO L495 AbstractCegarLoop]: Abstraction has 170 states and 236 transitions. [2023-11-12 00:42:02,159 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 7.25) internal successors, (29), 4 states have internal predecessors, (29), 2 states have call successors, (5), 1 states have call predecessors, (5), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2023-11-12 00:42:02,160 INFO L276 IsEmpty]: Start isEmpty. Operand 170 states and 236 transitions. [2023-11-12 00:42:02,172 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2023-11-12 00:42:02,172 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:42:02,173 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:42:02,173 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-12 00:42:02,174 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 00:42:02,175 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:42:02,175 INFO L85 PathProgramCache]: Analyzing trace with hash 347511880, now seen corresponding path program 1 times [2023-11-12 00:42:02,175 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:42:02,176 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [29164882] [2023-11-12 00:42:02,176 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:42:02,176 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:42:02,234 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:42:02,468 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2023-11-12 00:42:02,469 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:42:02,469 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [29164882] [2023-11-12 00:42:02,469 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [29164882] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:42:02,470 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [472794829] [2023-11-12 00:42:02,470 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:42:02,470 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:42:02,470 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7185a143-1d39-47a5-9e1d-afd264039b53/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:42:02,474 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7185a143-1d39-47a5-9e1d-afd264039b53/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:42:02,488 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7185a143-1d39-47a5-9e1d-afd264039b53/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-12 00:42:02,637 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:42:02,640 INFO L262 TraceCheckSpWp]: Trace formula consists of 377 conjuncts, 2 conjunts are in the unsatisfiable core [2023-11-12 00:42:02,649 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:42:02,800 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-11-12 00:42:02,801 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-12 00:42:02,801 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [472794829] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 00:42:02,801 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-12 00:42:02,802 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [4] total 5 [2023-11-12 00:42:02,803 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1818464542] [2023-11-12 00:42:02,803 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 00:42:02,805 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-12 00:42:02,805 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:42:02,806 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-12 00:42:02,806 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-11-12 00:42:02,807 INFO L87 Difference]: Start difference. First operand 170 states and 236 transitions. Second operand has 3 states, 3 states have (on average 16.333333333333332) internal successors, (49), 2 states have internal predecessors, (49), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-11-12 00:42:02,936 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:42:02,937 INFO L93 Difference]: Finished difference Result 493 states and 693 transitions. [2023-11-12 00:42:02,937 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-12 00:42:02,938 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 16.333333333333332) internal successors, (49), 2 states have internal predecessors, (49), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 73 [2023-11-12 00:42:02,938 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:42:02,945 INFO L225 Difference]: With dead ends: 493 [2023-11-12 00:42:02,945 INFO L226 Difference]: Without dead ends: 328 [2023-11-12 00:42:02,948 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 73 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-11-12 00:42:02,951 INFO L413 NwaCegarLoop]: 138 mSDtfsCounter, 101 mSDsluCounter, 95 mSDsCounter, 0 mSdLazyCounter, 49 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 101 SdHoareTripleChecker+Valid, 233 SdHoareTripleChecker+Invalid, 51 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 49 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-12 00:42:02,952 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [101 Valid, 233 Invalid, 51 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 49 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-12 00:42:02,953 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 328 states. [2023-11-12 00:42:02,995 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 328 to 324. [2023-11-12 00:42:02,997 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 324 states, 245 states have (on average 1.3755102040816327) internal successors, (337), 248 states have internal predecessors, (337), 54 states have call successors, (54), 24 states have call predecessors, (54), 24 states have return successors, (54), 52 states have call predecessors, (54), 54 states have call successors, (54) [2023-11-12 00:42:03,001 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 324 states to 324 states and 445 transitions. [2023-11-12 00:42:03,001 INFO L78 Accepts]: Start accepts. Automaton has 324 states and 445 transitions. Word has length 73 [2023-11-12 00:42:03,002 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:42:03,002 INFO L495 AbstractCegarLoop]: Abstraction has 324 states and 445 transitions. [2023-11-12 00:42:03,002 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 16.333333333333332) internal successors, (49), 2 states have internal predecessors, (49), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-11-12 00:42:03,003 INFO L276 IsEmpty]: Start isEmpty. Operand 324 states and 445 transitions. [2023-11-12 00:42:03,005 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2023-11-12 00:42:03,006 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:42:03,006 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:42:03,019 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7185a143-1d39-47a5-9e1d-afd264039b53/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-11-12 00:42:03,213 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7185a143-1d39-47a5-9e1d-afd264039b53/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:42:03,214 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 00:42:03,215 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:42:03,215 INFO L85 PathProgramCache]: Analyzing trace with hash -1140081850, now seen corresponding path program 1 times [2023-11-12 00:42:03,216 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:42:03,216 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1182111403] [2023-11-12 00:42:03,216 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:42:03,217 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:42:03,267 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:42:03,426 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2023-11-12 00:42:03,426 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:42:03,426 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1182111403] [2023-11-12 00:42:03,427 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1182111403] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:42:03,427 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1506237634] [2023-11-12 00:42:03,428 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:42:03,428 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:42:03,428 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7185a143-1d39-47a5-9e1d-afd264039b53/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:42:03,430 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7185a143-1d39-47a5-9e1d-afd264039b53/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:42:03,469 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7185a143-1d39-47a5-9e1d-afd264039b53/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-12 00:42:03,607 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:42:03,610 INFO L262 TraceCheckSpWp]: Trace formula consists of 371 conjuncts, 2 conjunts are in the unsatisfiable core [2023-11-12 00:42:03,614 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:42:03,681 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2023-11-12 00:42:03,681 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-12 00:42:03,682 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1506237634] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 00:42:03,682 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-12 00:42:03,682 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [4] total 5 [2023-11-12 00:42:03,682 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [180968134] [2023-11-12 00:42:03,682 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 00:42:03,683 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-12 00:42:03,683 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:42:03,684 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-12 00:42:03,684 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2023-11-12 00:42:03,684 INFO L87 Difference]: Start difference. First operand 324 states and 445 transitions. Second operand has 3 states, 3 states have (on average 15.333333333333334) internal successors, (46), 2 states have internal predecessors, (46), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-11-12 00:42:03,802 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:42:03,802 INFO L93 Difference]: Finished difference Result 949 states and 1320 transitions. [2023-11-12 00:42:03,802 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-12 00:42:03,803 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 15.333333333333334) internal successors, (46), 2 states have internal predecessors, (46), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 73 [2023-11-12 00:42:03,803 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:42:03,809 INFO L225 Difference]: With dead ends: 949 [2023-11-12 00:42:03,809 INFO L226 Difference]: Without dead ends: 630 [2023-11-12 00:42:03,811 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 73 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2023-11-12 00:42:03,813 INFO L413 NwaCegarLoop]: 104 mSDtfsCounter, 104 mSDsluCounter, 95 mSDsCounter, 0 mSdLazyCounter, 46 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 104 SdHoareTripleChecker+Valid, 199 SdHoareTripleChecker+Invalid, 48 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 46 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-12 00:42:03,813 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [104 Valid, 199 Invalid, 48 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 46 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-12 00:42:03,815 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 630 states. [2023-11-12 00:42:03,882 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 630 to 624. [2023-11-12 00:42:03,883 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 624 states, 475 states have (on average 1.3621052631578947) internal successors, (647), 480 states have internal predecessors, (647), 100 states have call successors, (100), 48 states have call predecessors, (100), 48 states have return successors, (100), 96 states have call predecessors, (100), 100 states have call successors, (100) [2023-11-12 00:42:03,910 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 624 states to 624 states and 847 transitions. [2023-11-12 00:42:03,910 INFO L78 Accepts]: Start accepts. Automaton has 624 states and 847 transitions. Word has length 73 [2023-11-12 00:42:03,910 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:42:03,911 INFO L495 AbstractCegarLoop]: Abstraction has 624 states and 847 transitions. [2023-11-12 00:42:03,911 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 15.333333333333334) internal successors, (46), 2 states have internal predecessors, (46), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-11-12 00:42:03,911 INFO L276 IsEmpty]: Start isEmpty. Operand 624 states and 847 transitions. [2023-11-12 00:42:03,914 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2023-11-12 00:42:03,914 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:42:03,914 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:42:03,935 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7185a143-1d39-47a5-9e1d-afd264039b53/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-11-12 00:42:04,120 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7185a143-1d39-47a5-9e1d-afd264039b53/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:42:04,120 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 00:42:04,121 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:42:04,121 INFO L85 PathProgramCache]: Analyzing trace with hash 1722635144, now seen corresponding path program 1 times [2023-11-12 00:42:04,121 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:42:04,122 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [123138614] [2023-11-12 00:42:04,122 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:42:04,122 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:42:04,147 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:42:04,481 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2023-11-12 00:42:04,481 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:42:04,481 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [123138614] [2023-11-12 00:42:04,482 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [123138614] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 00:42:04,484 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-12 00:42:04,484 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2023-11-12 00:42:04,484 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2015766396] [2023-11-12 00:42:04,485 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 00:42:04,489 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-11-12 00:42:04,490 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:42:04,491 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-11-12 00:42:04,492 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2023-11-12 00:42:04,492 INFO L87 Difference]: Start difference. First operand 624 states and 847 transitions. Second operand has 6 states, 6 states have (on average 7.166666666666667) internal successors, (43), 6 states have internal predecessors, (43), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2023-11-12 00:42:04,925 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:42:04,925 INFO L93 Difference]: Finished difference Result 1908 states and 2585 transitions. [2023-11-12 00:42:04,926 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-11-12 00:42:04,926 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 7.166666666666667) internal successors, (43), 6 states have internal predecessors, (43), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) Word has length 73 [2023-11-12 00:42:04,927 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:42:04,936 INFO L225 Difference]: With dead ends: 1908 [2023-11-12 00:42:04,937 INFO L226 Difference]: Without dead ends: 1290 [2023-11-12 00:42:04,939 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=41, Invalid=69, Unknown=0, NotChecked=0, Total=110 [2023-11-12 00:42:04,940 INFO L413 NwaCegarLoop]: 121 mSDtfsCounter, 291 mSDsluCounter, 175 mSDsCounter, 0 mSdLazyCounter, 164 mSolverCounterSat, 65 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 303 SdHoareTripleChecker+Valid, 296 SdHoareTripleChecker+Invalid, 229 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 65 IncrementalHoareTripleChecker+Valid, 164 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-12 00:42:04,941 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [303 Valid, 296 Invalid, 229 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [65 Valid, 164 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-12 00:42:04,943 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1290 states. [2023-11-12 00:42:05,045 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1290 to 1192. [2023-11-12 00:42:05,048 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1192 states, 907 states have (on average 1.3439911797133406) internal successors, (1219), 916 states have internal predecessors, (1219), 188 states have call successors, (188), 96 states have call predecessors, (188), 96 states have return successors, (188), 180 states have call predecessors, (188), 188 states have call successors, (188) [2023-11-12 00:42:05,058 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1192 states to 1192 states and 1595 transitions. [2023-11-12 00:42:05,058 INFO L78 Accepts]: Start accepts. Automaton has 1192 states and 1595 transitions. Word has length 73 [2023-11-12 00:42:05,059 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:42:05,059 INFO L495 AbstractCegarLoop]: Abstraction has 1192 states and 1595 transitions. [2023-11-12 00:42:05,059 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 7.166666666666667) internal successors, (43), 6 states have internal predecessors, (43), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2023-11-12 00:42:05,060 INFO L276 IsEmpty]: Start isEmpty. Operand 1192 states and 1595 transitions. [2023-11-12 00:42:05,063 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2023-11-12 00:42:05,063 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:42:05,063 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:42:05,064 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2023-11-12 00:42:05,064 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 00:42:05,064 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:42:05,065 INFO L85 PathProgramCache]: Analyzing trace with hash -1137855973, now seen corresponding path program 1 times [2023-11-12 00:42:05,065 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:42:05,065 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1017805819] [2023-11-12 00:42:05,065 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:42:05,066 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:42:05,085 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:42:05,292 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 10 proven. 14 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2023-11-12 00:42:05,292 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:42:05,293 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1017805819] [2023-11-12 00:42:05,293 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1017805819] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:42:05,296 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [389969025] [2023-11-12 00:42:05,296 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:42:05,297 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:42:05,297 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7185a143-1d39-47a5-9e1d-afd264039b53/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:42:05,300 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7185a143-1d39-47a5-9e1d-afd264039b53/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:42:05,328 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7185a143-1d39-47a5-9e1d-afd264039b53/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-12 00:42:05,440 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:42:05,443 INFO L262 TraceCheckSpWp]: Trace formula consists of 396 conjuncts, 2 conjunts are in the unsatisfiable core [2023-11-12 00:42:05,447 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:42:05,505 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 19 proven. 0 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2023-11-12 00:42:05,505 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-12 00:42:05,505 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [389969025] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 00:42:05,506 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-12 00:42:05,506 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2023-11-12 00:42:05,506 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1334006962] [2023-11-12 00:42:05,506 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 00:42:05,507 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-12 00:42:05,507 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:42:05,508 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-12 00:42:05,508 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-11-12 00:42:05,508 INFO L87 Difference]: Start difference. First operand 1192 states and 1595 transitions. Second operand has 3 states, 3 states have (on average 17.333333333333332) internal successors, (52), 3 states have internal predecessors, (52), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2023-11-12 00:42:05,681 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:42:05,682 INFO L93 Difference]: Finished difference Result 2117 states and 2862 transitions. [2023-11-12 00:42:05,682 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-12 00:42:05,682 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 17.333333333333332) internal successors, (52), 3 states have internal predecessors, (52), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) Word has length 87 [2023-11-12 00:42:05,683 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:42:05,693 INFO L225 Difference]: With dead ends: 2117 [2023-11-12 00:42:05,693 INFO L226 Difference]: Without dead ends: 1507 [2023-11-12 00:42:05,696 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 89 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-11-12 00:42:05,697 INFO L413 NwaCegarLoop]: 158 mSDtfsCounter, 48 mSDsluCounter, 107 mSDsCounter, 0 mSdLazyCounter, 54 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 48 SdHoareTripleChecker+Valid, 265 SdHoareTripleChecker+Invalid, 54 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 54 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-12 00:42:05,697 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [48 Valid, 265 Invalid, 54 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 54 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-12 00:42:05,700 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1507 states. [2023-11-12 00:42:05,800 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1507 to 1376. [2023-11-12 00:42:05,803 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1376 states, 1075 states have (on average 1.3646511627906976) internal successors, (1467), 1084 states have internal predecessors, (1467), 196 states have call successors, (196), 104 states have call predecessors, (196), 104 states have return successors, (196), 188 states have call predecessors, (196), 196 states have call successors, (196) [2023-11-12 00:42:05,813 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1376 states to 1376 states and 1859 transitions. [2023-11-12 00:42:05,813 INFO L78 Accepts]: Start accepts. Automaton has 1376 states and 1859 transitions. Word has length 87 [2023-11-12 00:42:05,814 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:42:05,814 INFO L495 AbstractCegarLoop]: Abstraction has 1376 states and 1859 transitions. [2023-11-12 00:42:05,814 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 17.333333333333332) internal successors, (52), 3 states have internal predecessors, (52), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2023-11-12 00:42:05,815 INFO L276 IsEmpty]: Start isEmpty. Operand 1376 states and 1859 transitions. [2023-11-12 00:42:05,820 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2023-11-12 00:42:05,820 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:42:05,821 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:42:05,831 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7185a143-1d39-47a5-9e1d-afd264039b53/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-11-12 00:42:06,026 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7185a143-1d39-47a5-9e1d-afd264039b53/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:42:06,027 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 00:42:06,027 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:42:06,027 INFO L85 PathProgramCache]: Analyzing trace with hash 48890440, now seen corresponding path program 1 times [2023-11-12 00:42:06,027 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:42:06,028 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1922447602] [2023-11-12 00:42:06,028 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:42:06,028 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:42:06,055 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:42:06,119 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2023-11-12 00:42:06,120 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:42:06,121 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1922447602] [2023-11-12 00:42:06,121 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1922447602] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 00:42:06,121 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-12 00:42:06,121 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-12 00:42:06,121 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [388155772] [2023-11-12 00:42:06,122 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 00:42:06,122 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-12 00:42:06,123 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:42:06,124 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-12 00:42:06,124 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-12 00:42:06,124 INFO L87 Difference]: Start difference. First operand 1376 states and 1859 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, (9), 1 states have call predecessors, (9), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2023-11-12 00:42:06,392 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:42:06,393 INFO L93 Difference]: Finished difference Result 3429 states and 4660 transitions. [2023-11-12 00:42:06,393 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-12 00:42:06,393 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, (9), 1 states have call predecessors, (9), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 97 [2023-11-12 00:42:06,394 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:42:06,407 INFO L225 Difference]: With dead ends: 3429 [2023-11-12 00:42:06,408 INFO L226 Difference]: Without dead ends: 2058 [2023-11-12 00:42:06,414 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-12 00:42:06,415 INFO L413 NwaCegarLoop]: 138 mSDtfsCounter, 96 mSDsluCounter, 95 mSDsCounter, 0 mSdLazyCounter, 49 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 96 SdHoareTripleChecker+Valid, 233 SdHoareTripleChecker+Invalid, 51 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 49 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-12 00:42:06,416 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [96 Valid, 233 Invalid, 51 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 49 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-12 00:42:06,419 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2058 states. [2023-11-12 00:42:06,572 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2058 to 2044. [2023-11-12 00:42:06,577 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2044 states, 1599 states have (on average 1.3502188868042526) internal successors, (2159), 1612 states have internal predecessors, (2159), 288 states have call successors, (288), 156 states have call predecessors, (288), 156 states have return successors, (288), 276 states have call predecessors, (288), 288 states have call successors, (288) [2023-11-12 00:42:06,596 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2044 states to 2044 states and 2735 transitions. [2023-11-12 00:42:06,597 INFO L78 Accepts]: Start accepts. Automaton has 2044 states and 2735 transitions. Word has length 97 [2023-11-12 00:42:06,598 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:42:06,598 INFO L495 AbstractCegarLoop]: Abstraction has 2044 states and 2735 transitions. [2023-11-12 00:42:06,598 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, (9), 1 states have call predecessors, (9), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2023-11-12 00:42:06,598 INFO L276 IsEmpty]: Start isEmpty. Operand 2044 states and 2735 transitions. [2023-11-12 00:42:06,606 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2023-11-12 00:42:06,606 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:42:06,607 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:42:06,607 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2023-11-12 00:42:06,607 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 00:42:06,608 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:42:06,608 INFO L85 PathProgramCache]: Analyzing trace with hash 2051827291, now seen corresponding path program 1 times [2023-11-12 00:42:06,608 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:42:06,608 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1250639910] [2023-11-12 00:42:06,608 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:42:06,609 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:42:06,640 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:42:06,774 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 23 proven. 1 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2023-11-12 00:42:06,774 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:42:06,774 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1250639910] [2023-11-12 00:42:06,775 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1250639910] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:42:06,775 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [786454215] [2023-11-12 00:42:06,775 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:42:06,775 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:42:06,776 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7185a143-1d39-47a5-9e1d-afd264039b53/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:42:06,777 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7185a143-1d39-47a5-9e1d-afd264039b53/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:42:06,796 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7185a143-1d39-47a5-9e1d-afd264039b53/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-11-12 00:42:06,939 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:42:06,942 INFO L262 TraceCheckSpWp]: Trace formula consists of 497 conjuncts, 2 conjunts are in the unsatisfiable core [2023-11-12 00:42:06,948 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:42:06,993 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 59 proven. 0 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2023-11-12 00:42:06,993 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-12 00:42:06,994 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [786454215] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 00:42:06,994 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-12 00:42:06,994 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [5] total 6 [2023-11-12 00:42:06,994 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1093924669] [2023-11-12 00:42:06,995 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 00:42:06,996 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-12 00:42:06,996 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:42:06,997 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-12 00:42:06,998 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2023-11-12 00:42:06,998 INFO L87 Difference]: Start difference. First operand 2044 states and 2735 transitions. Second operand has 3 states, 3 states have (on average 25.333333333333332) internal successors, (76), 3 states have internal predecessors, (76), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2023-11-12 00:42:07,269 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:42:07,269 INFO L93 Difference]: Finished difference Result 3852 states and 5213 transitions. [2023-11-12 00:42:07,269 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-12 00:42:07,270 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 25.333333333333332) internal successors, (76), 3 states have internal predecessors, (76), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) Word has length 111 [2023-11-12 00:42:07,270 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:42:07,289 INFO L225 Difference]: With dead ends: 3852 [2023-11-12 00:42:07,289 INFO L226 Difference]: Without dead ends: 2482 [2023-11-12 00:42:07,294 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 115 GetRequests, 111 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2023-11-12 00:42:07,295 INFO L413 NwaCegarLoop]: 154 mSDtfsCounter, 57 mSDsluCounter, 108 mSDsCounter, 0 mSdLazyCounter, 51 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 57 SdHoareTripleChecker+Valid, 262 SdHoareTripleChecker+Invalid, 51 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 51 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-12 00:42:07,296 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [57 Valid, 262 Invalid, 51 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 51 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-12 00:42:07,300 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2482 states. [2023-11-12 00:42:07,537 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2482 to 2288. [2023-11-12 00:42:07,542 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2288 states, 1819 states have (on average 1.3694337548103352) internal successors, (2491), 1832 states have internal predecessors, (2491), 300 states have call successors, (300), 168 states have call predecessors, (300), 168 states have return successors, (300), 288 states have call predecessors, (300), 300 states have call successors, (300) [2023-11-12 00:42:07,558 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2288 states to 2288 states and 3091 transitions. [2023-11-12 00:42:07,559 INFO L78 Accepts]: Start accepts. Automaton has 2288 states and 3091 transitions. Word has length 111 [2023-11-12 00:42:07,560 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:42:07,560 INFO L495 AbstractCegarLoop]: Abstraction has 2288 states and 3091 transitions. [2023-11-12 00:42:07,560 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 25.333333333333332) internal successors, (76), 3 states have internal predecessors, (76), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2023-11-12 00:42:07,561 INFO L276 IsEmpty]: Start isEmpty. Operand 2288 states and 3091 transitions. [2023-11-12 00:42:07,569 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2023-11-12 00:42:07,569 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:42:07,570 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:42:07,585 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7185a143-1d39-47a5-9e1d-afd264039b53/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-11-12 00:42:07,786 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7185a143-1d39-47a5-9e1d-afd264039b53/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2023-11-12 00:42:07,786 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 00:42:07,787 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:42:07,789 INFO L85 PathProgramCache]: Analyzing trace with hash 2087491547, now seen corresponding path program 2 times [2023-11-12 00:42:07,789 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:42:07,789 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [164212190] [2023-11-12 00:42:07,790 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:42:07,790 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:42:07,814 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:42:08,131 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 10 proven. 27 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2023-11-12 00:42:08,131 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:42:08,131 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [164212190] [2023-11-12 00:42:08,132 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [164212190] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:42:08,132 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [462954421] [2023-11-12 00:42:08,132 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-12 00:42:08,132 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:42:08,133 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7185a143-1d39-47a5-9e1d-afd264039b53/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:42:08,134 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7185a143-1d39-47a5-9e1d-afd264039b53/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:42:08,138 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7185a143-1d39-47a5-9e1d-afd264039b53/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-11-12 00:42:08,263 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2023-11-12 00:42:08,263 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-12 00:42:08,265 INFO L262 TraceCheckSpWp]: Trace formula consists of 317 conjuncts, 3 conjunts are in the unsatisfiable core [2023-11-12 00:42:08,271 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:42:08,309 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 49 proven. 0 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2023-11-12 00:42:08,309 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-12 00:42:08,309 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [462954421] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 00:42:08,309 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-12 00:42:08,310 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2023-11-12 00:42:08,310 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1951256869] [2023-11-12 00:42:08,310 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 00:42:08,311 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-12 00:42:08,311 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:42:08,311 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-12 00:42:08,312 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-11-12 00:42:08,312 INFO L87 Difference]: Start difference. First operand 2288 states and 3091 transitions. Second operand has 3 states, 3 states have (on average 23.333333333333332) internal successors, (70), 3 states have internal predecessors, (70), 3 states have call successors, (10), 3 states have call predecessors, (10), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) [2023-11-12 00:42:08,579 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:42:08,579 INFO L93 Difference]: Finished difference Result 3912 states and 5393 transitions. [2023-11-12 00:42:08,579 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-12 00:42:08,580 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 23.333333333333332) internal successors, (70), 3 states have internal predecessors, (70), 3 states have call successors, (10), 3 states have call predecessors, (10), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) Word has length 111 [2023-11-12 00:42:08,580 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:42:08,595 INFO L225 Difference]: With dead ends: 3912 [2023-11-12 00:42:08,595 INFO L226 Difference]: Without dead ends: 2298 [2023-11-12 00:42:08,600 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 118 GetRequests, 113 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-11-12 00:42:08,602 INFO L413 NwaCegarLoop]: 162 mSDtfsCounter, 107 mSDsluCounter, 97 mSDsCounter, 0 mSdLazyCounter, 54 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 107 SdHoareTripleChecker+Valid, 259 SdHoareTripleChecker+Invalid, 57 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 54 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-12 00:42:08,602 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [107 Valid, 259 Invalid, 57 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 54 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-12 00:42:08,605 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2298 states. [2023-11-12 00:42:08,781 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2298 to 2280. [2023-11-12 00:42:08,787 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2280 states, 1811 states have (on average 1.348978464936499) internal successors, (2443), 1824 states have internal predecessors, (2443), 300 states have call successors, (300), 168 states have call predecessors, (300), 168 states have return successors, (300), 288 states have call predecessors, (300), 300 states have call successors, (300) [2023-11-12 00:42:08,799 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2280 states to 2280 states and 3043 transitions. [2023-11-12 00:42:08,800 INFO L78 Accepts]: Start accepts. Automaton has 2280 states and 3043 transitions. Word has length 111 [2023-11-12 00:42:08,801 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:42:08,802 INFO L495 AbstractCegarLoop]: Abstraction has 2280 states and 3043 transitions. [2023-11-12 00:42:08,802 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 23.333333333333332) internal successors, (70), 3 states have internal predecessors, (70), 3 states have call successors, (10), 3 states have call predecessors, (10), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) [2023-11-12 00:42:08,802 INFO L276 IsEmpty]: Start isEmpty. Operand 2280 states and 3043 transitions. [2023-11-12 00:42:08,813 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2023-11-12 00:42:08,813 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:42:08,814 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:42:08,828 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7185a143-1d39-47a5-9e1d-afd264039b53/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-11-12 00:42:09,025 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7185a143-1d39-47a5-9e1d-afd264039b53/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:42:09,025 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 00:42:09,026 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:42:09,026 INFO L85 PathProgramCache]: Analyzing trace with hash -1338602309, now seen corresponding path program 1 times [2023-11-12 00:42:09,026 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:42:09,026 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1386553459] [2023-11-12 00:42:09,026 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:42:09,027 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:42:09,049 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:42:09,322 INFO L134 CoverageAnalysis]: Checked inductivity of 71 backedges. 10 proven. 25 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2023-11-12 00:42:09,323 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:42:09,323 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1386553459] [2023-11-12 00:42:09,323 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1386553459] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:42:09,323 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [985225512] [2023-11-12 00:42:09,323 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:42:09,324 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:42:09,324 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7185a143-1d39-47a5-9e1d-afd264039b53/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:42:09,325 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7185a143-1d39-47a5-9e1d-afd264039b53/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:42:09,348 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7185a143-1d39-47a5-9e1d-afd264039b53/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-11-12 00:42:09,484 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:42:09,487 INFO L262 TraceCheckSpWp]: Trace formula consists of 503 conjuncts, 2 conjunts are in the unsatisfiable core [2023-11-12 00:42:09,492 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:42:09,533 INFO L134 CoverageAnalysis]: Checked inductivity of 71 backedges. 51 proven. 0 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2023-11-12 00:42:09,533 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-12 00:42:09,533 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [985225512] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 00:42:09,534 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-12 00:42:09,534 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2023-11-12 00:42:09,534 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2114593323] [2023-11-12 00:42:09,534 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 00:42:09,535 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-12 00:42:09,535 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:42:09,536 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-12 00:42:09,537 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-11-12 00:42:09,537 INFO L87 Difference]: Start difference. First operand 2280 states and 3043 transitions. Second operand has 3 states, 3 states have (on average 24.666666666666668) internal successors, (74), 3 states have internal predecessors, (74), 3 states have call successors, (10), 3 states have call predecessors, (10), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) [2023-11-12 00:42:09,750 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:42:09,750 INFO L93 Difference]: Finished difference Result 4250 states and 5666 transitions. [2023-11-12 00:42:09,751 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-12 00:42:09,751 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 24.666666666666668) internal successors, (74), 3 states have internal predecessors, (74), 3 states have call successors, (10), 3 states have call predecessors, (10), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) Word has length 111 [2023-11-12 00:42:09,751 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:42:09,769 INFO L225 Difference]: With dead ends: 4250 [2023-11-12 00:42:09,769 INFO L226 Difference]: Without dead ends: 2728 [2023-11-12 00:42:09,775 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 118 GetRequests, 113 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-11-12 00:42:09,777 INFO L413 NwaCegarLoop]: 117 mSDtfsCounter, 105 mSDsluCounter, 24 mSDsCounter, 0 mSdLazyCounter, 28 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 105 SdHoareTripleChecker+Valid, 141 SdHoareTripleChecker+Invalid, 32 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 28 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-12 00:42:09,778 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [105 Valid, 141 Invalid, 32 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 28 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-12 00:42:09,782 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2728 states. [2023-11-12 00:42:10,053 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2728 to 2728. [2023-11-12 00:42:10,060 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2728 states, 2195 states have (on average 1.3207289293849658) internal successors, (2899), 2208 states have internal predecessors, (2899), 320 states have call successors, (320), 212 states have call predecessors, (320), 212 states have return successors, (320), 308 states have call predecessors, (320), 320 states have call successors, (320) [2023-11-12 00:42:10,073 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2728 states to 2728 states and 3539 transitions. [2023-11-12 00:42:10,074 INFO L78 Accepts]: Start accepts. Automaton has 2728 states and 3539 transitions. Word has length 111 [2023-11-12 00:42:10,074 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:42:10,075 INFO L495 AbstractCegarLoop]: Abstraction has 2728 states and 3539 transitions. [2023-11-12 00:42:10,075 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 24.666666666666668) internal successors, (74), 3 states have internal predecessors, (74), 3 states have call successors, (10), 3 states have call predecessors, (10), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) [2023-11-12 00:42:10,075 INFO L276 IsEmpty]: Start isEmpty. Operand 2728 states and 3539 transitions. [2023-11-12 00:42:10,083 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 113 [2023-11-12 00:42:10,083 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:42:10,084 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:42:10,099 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7185a143-1d39-47a5-9e1d-afd264039b53/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2023-11-12 00:42:10,290 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7185a143-1d39-47a5-9e1d-afd264039b53/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:42:10,290 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 00:42:10,291 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:42:10,291 INFO L85 PathProgramCache]: Analyzing trace with hash 1765926664, now seen corresponding path program 1 times [2023-11-12 00:42:10,291 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:42:10,292 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [28283117] [2023-11-12 00:42:10,292 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:42:10,292 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:42:10,314 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:42:10,560 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 10 proven. 26 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2023-11-12 00:42:10,561 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:42:10,561 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [28283117] [2023-11-12 00:42:10,561 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [28283117] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:42:10,561 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1892514527] [2023-11-12 00:42:10,562 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:42:10,564 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:42:10,564 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7185a143-1d39-47a5-9e1d-afd264039b53/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:42:10,565 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7185a143-1d39-47a5-9e1d-afd264039b53/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:42:10,584 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7185a143-1d39-47a5-9e1d-afd264039b53/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-11-12 00:42:10,722 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:42:10,725 INFO L262 TraceCheckSpWp]: Trace formula consists of 502 conjuncts, 3 conjunts are in the unsatisfiable core [2023-11-12 00:42:10,729 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:42:10,763 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 54 proven. 0 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2023-11-12 00:42:10,763 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-12 00:42:10,794 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1892514527] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 00:42:10,794 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-12 00:42:10,795 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2023-11-12 00:42:10,795 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [654353412] [2023-11-12 00:42:10,795 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 00:42:10,795 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-12 00:42:10,795 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:42:10,796 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-12 00:42:10,796 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-11-12 00:42:10,796 INFO L87 Difference]: Start difference. First operand 2728 states and 3539 transitions. Second operand has 3 states, 3 states have (on average 26.0) internal successors, (78), 3 states have internal predecessors, (78), 3 states have call successors, (10), 3 states have call predecessors, (10), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2023-11-12 00:42:11,079 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:42:11,080 INFO L93 Difference]: Finished difference Result 6506 states and 8536 transitions. [2023-11-12 00:42:11,080 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-12 00:42:11,080 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 26.0) internal successors, (78), 3 states have internal predecessors, (78), 3 states have call successors, (10), 3 states have call predecessors, (10), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) Word has length 112 [2023-11-12 00:42:11,081 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:42:11,106 INFO L225 Difference]: With dead ends: 6506 [2023-11-12 00:42:11,106 INFO L226 Difference]: Without dead ends: 3784 [2023-11-12 00:42:11,114 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 119 GetRequests, 114 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-11-12 00:42:11,115 INFO L413 NwaCegarLoop]: 120 mSDtfsCounter, 53 mSDsluCounter, 94 mSDsCounter, 0 mSdLazyCounter, 45 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 53 SdHoareTripleChecker+Valid, 214 SdHoareTripleChecker+Invalid, 47 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 45 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-12 00:42:11,115 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [53 Valid, 214 Invalid, 47 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 45 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-12 00:42:11,121 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3784 states. [2023-11-12 00:42:11,377 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3784 to 3068. [2023-11-12 00:42:11,385 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3068 states, 2499 states have (on average 1.3377350940376151) internal successors, (3343), 2513 states have internal predecessors, (3343), 338 states have call successors, (338), 230 states have call predecessors, (338), 230 states have return successors, (338), 325 states have call predecessors, (338), 338 states have call successors, (338) [2023-11-12 00:42:11,398 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3068 states to 3068 states and 4019 transitions. [2023-11-12 00:42:11,399 INFO L78 Accepts]: Start accepts. Automaton has 3068 states and 4019 transitions. Word has length 112 [2023-11-12 00:42:11,399 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:42:11,399 INFO L495 AbstractCegarLoop]: Abstraction has 3068 states and 4019 transitions. [2023-11-12 00:42:11,400 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 26.0) internal successors, (78), 3 states have internal predecessors, (78), 3 states have call successors, (10), 3 states have call predecessors, (10), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2023-11-12 00:42:11,400 INFO L276 IsEmpty]: Start isEmpty. Operand 3068 states and 4019 transitions. [2023-11-12 00:42:11,420 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2023-11-12 00:42:11,420 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:42:11,421 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:42:11,428 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7185a143-1d39-47a5-9e1d-afd264039b53/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2023-11-12 00:42:11,627 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7185a143-1d39-47a5-9e1d-afd264039b53/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:42:11,628 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 00:42:11,628 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:42:11,628 INFO L85 PathProgramCache]: Analyzing trace with hash -1026057191, now seen corresponding path program 1 times [2023-11-12 00:42:11,628 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:42:11,628 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [609413688] [2023-11-12 00:42:11,628 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:42:11,629 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:42:11,648 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:42:11,912 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 20 proven. 26 refuted. 0 times theorem prover too weak. 29 trivial. 0 not checked. [2023-11-12 00:42:11,913 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:42:11,913 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [609413688] [2023-11-12 00:42:11,913 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [609413688] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:42:11,913 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [902803659] [2023-11-12 00:42:11,913 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:42:11,914 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:42:11,914 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7185a143-1d39-47a5-9e1d-afd264039b53/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:42:11,915 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7185a143-1d39-47a5-9e1d-afd264039b53/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:42:11,940 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7185a143-1d39-47a5-9e1d-afd264039b53/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-11-12 00:42:12,088 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:42:12,091 INFO L262 TraceCheckSpWp]: Trace formula consists of 508 conjuncts, 9 conjunts are in the unsatisfiable core [2023-11-12 00:42:12,096 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:42:12,287 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 49 proven. 0 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2023-11-12 00:42:12,288 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-12 00:42:12,288 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [902803659] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 00:42:12,288 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-12 00:42:12,288 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [6] total 10 [2023-11-12 00:42:12,289 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1930744421] [2023-11-12 00:42:12,289 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 00:42:12,289 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-11-12 00:42:12,289 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:42:12,290 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-11-12 00:42:12,290 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=70, Unknown=0, NotChecked=0, Total=90 [2023-11-12 00:42:12,291 INFO L87 Difference]: Start difference. First operand 3068 states and 4019 transitions. Second operand has 6 states, 6 states have (on average 12.333333333333334) internal successors, (74), 5 states have internal predecessors, (74), 3 states have call successors, (9), 4 states have call predecessors, (9), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2023-11-12 00:42:12,898 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:42:12,898 INFO L93 Difference]: Finished difference Result 7540 states and 9849 transitions. [2023-11-12 00:42:12,899 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-11-12 00:42:12,899 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 12.333333333333334) internal successors, (74), 5 states have internal predecessors, (74), 3 states have call successors, (9), 4 states have call predecessors, (9), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 114 [2023-11-12 00:42:12,899 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:42:12,931 INFO L225 Difference]: With dead ends: 7540 [2023-11-12 00:42:12,931 INFO L226 Difference]: Without dead ends: 4478 [2023-11-12 00:42:12,938 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 125 GetRequests, 113 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=45, Invalid=137, Unknown=0, NotChecked=0, Total=182 [2023-11-12 00:42:12,939 INFO L413 NwaCegarLoop]: 104 mSDtfsCounter, 340 mSDsluCounter, 129 mSDsCounter, 0 mSdLazyCounter, 105 mSolverCounterSat, 117 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 352 SdHoareTripleChecker+Valid, 233 SdHoareTripleChecker+Invalid, 222 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 117 IncrementalHoareTripleChecker+Valid, 105 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-12 00:42:12,940 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [352 Valid, 233 Invalid, 222 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [117 Valid, 105 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-12 00:42:12,946 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4478 states. [2023-11-12 00:42:13,435 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4478 to 4476. [2023-11-12 00:42:13,454 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4476 states, 3637 states have (on average 1.3150948583997801) internal successors, (4783), 3657 states have internal predecessors, (4783), 496 states have call successors, (496), 342 states have call predecessors, (496), 342 states have return successors, (496), 477 states have call predecessors, (496), 496 states have call successors, (496) [2023-11-12 00:42:13,484 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4476 states to 4476 states and 5775 transitions. [2023-11-12 00:42:13,485 INFO L78 Accepts]: Start accepts. Automaton has 4476 states and 5775 transitions. Word has length 114 [2023-11-12 00:42:13,485 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:42:13,486 INFO L495 AbstractCegarLoop]: Abstraction has 4476 states and 5775 transitions. [2023-11-12 00:42:13,486 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 12.333333333333334) internal successors, (74), 5 states have internal predecessors, (74), 3 states have call successors, (9), 4 states have call predecessors, (9), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2023-11-12 00:42:13,487 INFO L276 IsEmpty]: Start isEmpty. Operand 4476 states and 5775 transitions. [2023-11-12 00:42:13,499 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 116 [2023-11-12 00:42:13,500 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:42:13,500 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:42:13,511 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7185a143-1d39-47a5-9e1d-afd264039b53/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Ended with exit code 0 [2023-11-12 00:42:13,706 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7185a143-1d39-47a5-9e1d-afd264039b53/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:42:13,707 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 00:42:13,708 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:42:13,708 INFO L85 PathProgramCache]: Analyzing trace with hash 1945405189, now seen corresponding path program 1 times [2023-11-12 00:42:13,709 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:42:13,709 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [759706087] [2023-11-12 00:42:13,709 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:42:13,709 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:42:13,734 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:42:13,843 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 22 proven. 4 refuted. 0 times theorem prover too weak. 47 trivial. 0 not checked. [2023-11-12 00:42:13,843 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:42:13,843 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [759706087] [2023-11-12 00:42:13,843 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [759706087] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:42:13,844 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [438034494] [2023-11-12 00:42:13,844 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:42:13,844 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:42:13,844 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7185a143-1d39-47a5-9e1d-afd264039b53/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:42:13,845 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7185a143-1d39-47a5-9e1d-afd264039b53/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:42:13,872 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7185a143-1d39-47a5-9e1d-afd264039b53/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2023-11-12 00:42:14,004 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:42:14,007 INFO L262 TraceCheckSpWp]: Trace formula consists of 512 conjuncts, 2 conjunts are in the unsatisfiable core [2023-11-12 00:42:14,011 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:42:14,040 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 59 proven. 0 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2023-11-12 00:42:14,040 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-12 00:42:14,040 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [438034494] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 00:42:14,041 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-12 00:42:14,041 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [5] total 6 [2023-11-12 00:42:14,041 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1599540029] [2023-11-12 00:42:14,041 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 00:42:14,042 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-12 00:42:14,042 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:42:14,042 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-12 00:42:14,043 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2023-11-12 00:42:14,043 INFO L87 Difference]: Start difference. First operand 4476 states and 5775 transitions. Second operand has 3 states, 3 states have (on average 26.666666666666668) internal successors, (80), 3 states have internal predecessors, (80), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2023-11-12 00:42:14,535 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:42:14,535 INFO L93 Difference]: Finished difference Result 8504 states and 11085 transitions. [2023-11-12 00:42:14,536 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-12 00:42:14,536 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 26.666666666666668) internal successors, (80), 3 states have internal predecessors, (80), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) Word has length 115 [2023-11-12 00:42:14,536 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:42:14,583 INFO L225 Difference]: With dead ends: 8504 [2023-11-12 00:42:14,583 INFO L226 Difference]: Without dead ends: 5522 [2023-11-12 00:42:14,592 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 119 GetRequests, 115 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2023-11-12 00:42:14,592 INFO L413 NwaCegarLoop]: 163 mSDtfsCounter, 60 mSDsluCounter, 107 mSDsCounter, 0 mSdLazyCounter, 53 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 60 SdHoareTripleChecker+Valid, 270 SdHoareTripleChecker+Invalid, 53 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 53 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-12 00:42:14,593 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [60 Valid, 270 Invalid, 53 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 53 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-12 00:42:14,602 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5522 states. [2023-11-12 00:42:15,073 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5522 to 5028. [2023-11-12 00:42:15,081 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5028 states, 4125 states have (on average 1.3263030303030303) internal successors, (5471), 4145 states have internal predecessors, (5471), 528 states have call successors, (528), 374 states have call predecessors, (528), 374 states have return successors, (528), 509 states have call predecessors, (528), 528 states have call successors, (528) [2023-11-12 00:42:15,107 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5028 states to 5028 states and 6527 transitions. [2023-11-12 00:42:15,108 INFO L78 Accepts]: Start accepts. Automaton has 5028 states and 6527 transitions. Word has length 115 [2023-11-12 00:42:15,108 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:42:15,108 INFO L495 AbstractCegarLoop]: Abstraction has 5028 states and 6527 transitions. [2023-11-12 00:42:15,108 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 26.666666666666668) internal successors, (80), 3 states have internal predecessors, (80), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2023-11-12 00:42:15,109 INFO L276 IsEmpty]: Start isEmpty. Operand 5028 states and 6527 transitions. [2023-11-12 00:42:15,124 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2023-11-12 00:42:15,124 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:42:15,124 INFO L195 NwaCegarLoop]: trace histogram [5, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 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] [2023-11-12 00:42:15,137 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7185a143-1d39-47a5-9e1d-afd264039b53/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2023-11-12 00:42:15,331 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7185a143-1d39-47a5-9e1d-afd264039b53/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2023-11-12 00:42:15,331 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 00:42:15,332 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:42:15,332 INFO L85 PathProgramCache]: Analyzing trace with hash 1987844196, now seen corresponding path program 1 times [2023-11-12 00:42:15,332 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:42:15,332 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1829185769] [2023-11-12 00:42:15,333 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:42:15,333 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:42:15,363 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:42:15,761 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 12 proven. 26 refuted. 0 times theorem prover too weak. 44 trivial. 0 not checked. [2023-11-12 00:42:15,761 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:42:15,761 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1829185769] [2023-11-12 00:42:15,762 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1829185769] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:42:15,762 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1309368962] [2023-11-12 00:42:15,762 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:42:15,762 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:42:15,762 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7185a143-1d39-47a5-9e1d-afd264039b53/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:42:15,763 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7185a143-1d39-47a5-9e1d-afd264039b53/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:42:15,800 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7185a143-1d39-47a5-9e1d-afd264039b53/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2023-11-12 00:42:15,988 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:42:15,992 INFO L262 TraceCheckSpWp]: Trace formula consists of 580 conjuncts, 15 conjunts are in the unsatisfiable core [2023-11-12 00:42:15,996 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:42:16,136 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 62 proven. 14 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-11-12 00:42:16,136 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 00:42:16,548 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 17 proven. 3 refuted. 0 times theorem prover too weak. 62 trivial. 0 not checked. [2023-11-12 00:42:16,549 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1309368962] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-12 00:42:16,549 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1298397237] [2023-11-12 00:42:16,576 INFO L159 IcfgInterpreter]: Started Sifa with 69 locations of interest [2023-11-12 00:42:16,576 INFO L166 IcfgInterpreter]: Building call graph [2023-11-12 00:42:16,580 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-12 00:42:16,586 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-12 00:42:16,587 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-12 00:42:22,911 INFO L197 IcfgInterpreter]: Interpreting procedure reset_delta_events with input of size 95 for LOIs [2023-11-12 00:42:23,011 INFO L197 IcfgInterpreter]: Interpreting procedure fire_delta_events with input of size 106 for LOIs [2023-11-12 00:42:23,195 INFO L197 IcfgInterpreter]: Interpreting procedure update_channels with input of size 81 for LOIs [2023-11-12 00:42:23,283 INFO L197 IcfgInterpreter]: Interpreting procedure exists_runnable_thread with input of size 1 for LOIs [2023-11-12 00:42:23,298 INFO L197 IcfgInterpreter]: Interpreting procedure immediate_notify with input of size 43 for LOIs [2023-11-12 00:42:23,455 INFO L197 IcfgInterpreter]: Interpreting procedure activate_threads with input of size 14 for LOIs [2023-11-12 00:42:23,511 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-12 00:42:29,390 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '90383#(and (<= |ULTIMATE.start_eval_~tmp_ndt_1~0#1| 2147483647) (= |ULTIMATE.start_start_simulation_~kernel_st~0#1| 1) (<= |ULTIMATE.start_eval_~tmp~0#1| 1) (<= 0 (+ |ULTIMATE.start_eval_~tmp_ndt_1~0#1| 2147483648)) (not (= |ULTIMATE.start_eval_~tmp~0#1| 0)) (= ~m_pc~0 1) (not (= ~token~0 (+ 3 ~local~0))) (not (= |ULTIMATE.start_eval_~tmp_ndt_1~0#1| 0)) (= ~m_st~0 1) (<= 0 |ULTIMATE.start_eval_~tmp~0#1|))' at error location [2023-11-12 00:42:29,390 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-12 00:42:29,390 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-12 00:42:29,390 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 8, 6] total 16 [2023-11-12 00:42:29,390 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [408098376] [2023-11-12 00:42:29,391 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-12 00:42:29,391 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2023-11-12 00:42:29,392 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:42:29,392 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2023-11-12 00:42:29,395 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=388, Invalid=4168, Unknown=0, NotChecked=0, Total=4556 [2023-11-12 00:42:29,395 INFO L87 Difference]: Start difference. First operand 5028 states and 6527 transitions. Second operand has 16 states, 14 states have (on average 10.285714285714286) internal successors, (144), 14 states have internal predecessors, (144), 8 states have call successors, (33), 5 states have call predecessors, (33), 6 states have return successors, (33), 8 states have call predecessors, (33), 8 states have call successors, (33) [2023-11-12 00:42:35,153 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:42:35,153 INFO L93 Difference]: Finished difference Result 15470 states and 20485 transitions. [2023-11-12 00:42:35,153 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 118 states. [2023-11-12 00:42:35,154 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 14 states have (on average 10.285714285714286) internal successors, (144), 14 states have internal predecessors, (144), 8 states have call successors, (33), 5 states have call predecessors, (33), 6 states have return successors, (33), 8 states have call predecessors, (33), 8 states have call successors, (33) Word has length 121 [2023-11-12 00:42:35,154 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:42:35,196 INFO L225 Difference]: With dead ends: 15470 [2023-11-12 00:42:35,196 INFO L226 Difference]: Without dead ends: 10448 [2023-11-12 00:42:35,229 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 546 GetRequests, 365 SyntacticMatches, 0 SemanticMatches, 181 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13443 ImplicationChecksByTransitivity, 8.9s TimeCoverageRelationStatistics Valid=2674, Invalid=30632, Unknown=0, NotChecked=0, Total=33306 [2023-11-12 00:42:35,230 INFO L413 NwaCegarLoop]: 370 mSDtfsCounter, 1175 mSDsluCounter, 2973 mSDsCounter, 0 mSdLazyCounter, 2198 mSolverCounterSat, 301 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1181 SdHoareTripleChecker+Valid, 3343 SdHoareTripleChecker+Invalid, 2499 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 301 IncrementalHoareTripleChecker+Valid, 2198 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.9s IncrementalHoareTripleChecker+Time [2023-11-12 00:42:35,231 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1181 Valid, 3343 Invalid, 2499 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [301 Valid, 2198 Invalid, 0 Unknown, 0 Unchecked, 1.9s Time] [2023-11-12 00:42:35,245 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10448 states. [2023-11-12 00:42:35,974 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10448 to 7521. [2023-11-12 00:42:35,984 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 7521 states, 6350 states have (on average 1.2872440944881889) internal successors, (8174), 6376 states have internal predecessors, (8174), 633 states have call successors, (633), 537 states have call predecessors, (633), 537 states have return successors, (633), 608 states have call predecessors, (633), 633 states have call successors, (633) [2023-11-12 00:42:36,017 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7521 states to 7521 states and 9440 transitions. [2023-11-12 00:42:36,018 INFO L78 Accepts]: Start accepts. Automaton has 7521 states and 9440 transitions. Word has length 121 [2023-11-12 00:42:36,018 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:42:36,019 INFO L495 AbstractCegarLoop]: Abstraction has 7521 states and 9440 transitions. [2023-11-12 00:42:36,019 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 14 states have (on average 10.285714285714286) internal successors, (144), 14 states have internal predecessors, (144), 8 states have call successors, (33), 5 states have call predecessors, (33), 6 states have return successors, (33), 8 states have call predecessors, (33), 8 states have call successors, (33) [2023-11-12 00:42:36,019 INFO L276 IsEmpty]: Start isEmpty. Operand 7521 states and 9440 transitions. [2023-11-12 00:42:36,034 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 121 [2023-11-12 00:42:36,034 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:42:36,035 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:42:36,049 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7185a143-1d39-47a5-9e1d-afd264039b53/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2023-11-12 00:42:36,241 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7185a143-1d39-47a5-9e1d-afd264039b53/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2023-11-12 00:42:36,241 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 00:42:36,242 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:42:36,242 INFO L85 PathProgramCache]: Analyzing trace with hash -493498182, now seen corresponding path program 1 times [2023-11-12 00:42:36,242 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:42:36,242 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1153563893] [2023-11-12 00:42:36,242 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:42:36,242 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:42:36,275 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:42:36,370 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 21 proven. 5 refuted. 0 times theorem prover too weak. 47 trivial. 0 not checked. [2023-11-12 00:42:36,370 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:42:36,370 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1153563893] [2023-11-12 00:42:36,370 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1153563893] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:42:36,371 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1252911420] [2023-11-12 00:42:36,371 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:42:36,372 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:42:36,372 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7185a143-1d39-47a5-9e1d-afd264039b53/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:42:36,373 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7185a143-1d39-47a5-9e1d-afd264039b53/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:42:36,394 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7185a143-1d39-47a5-9e1d-afd264039b53/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2023-11-12 00:42:36,524 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:42:36,527 INFO L262 TraceCheckSpWp]: Trace formula consists of 527 conjuncts, 2 conjunts are in the unsatisfiable core [2023-11-12 00:42:36,530 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:42:36,555 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 59 proven. 0 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2023-11-12 00:42:36,556 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-12 00:42:36,556 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1252911420] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 00:42:36,556 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-12 00:42:36,556 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [5] total 6 [2023-11-12 00:42:36,557 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [588061911] [2023-11-12 00:42:36,557 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 00:42:36,557 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-12 00:42:36,557 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:42:36,558 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-12 00:42:36,558 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2023-11-12 00:42:36,558 INFO L87 Difference]: Start difference. First operand 7521 states and 9440 transitions. Second operand has 3 states, 3 states have (on average 28.333333333333332) internal successors, (85), 3 states have internal predecessors, (85), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2023-11-12 00:42:37,076 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:42:37,076 INFO L93 Difference]: Finished difference Result 13899 states and 17629 transitions. [2023-11-12 00:42:37,076 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-12 00:42:37,077 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 28.333333333333332) internal successors, (85), 3 states have internal predecessors, (85), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) Word has length 120 [2023-11-12 00:42:37,077 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:42:37,112 INFO L225 Difference]: With dead ends: 13899 [2023-11-12 00:42:37,112 INFO L226 Difference]: Without dead ends: 8519 [2023-11-12 00:42:37,209 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 124 GetRequests, 120 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2023-11-12 00:42:37,211 INFO L413 NwaCegarLoop]: 171 mSDtfsCounter, 66 mSDsluCounter, 109 mSDsCounter, 0 mSdLazyCounter, 55 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 66 SdHoareTripleChecker+Valid, 280 SdHoareTripleChecker+Invalid, 55 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 55 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-12 00:42:37,212 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [66 Valid, 280 Invalid, 55 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 55 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-12 00:42:37,222 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8519 states. [2023-11-12 00:42:38,095 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8519 to 7966. [2023-11-12 00:42:38,106 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 7966 states, 6712 states have (on average 1.2818831942789035) internal successors, (8604), 6734 states have internal predecessors, (8604), 674 states have call successors, (674), 579 states have call predecessors, (674), 579 states have return successors, (674), 653 states have call predecessors, (674), 674 states have call successors, (674) [2023-11-12 00:42:38,131 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7966 states to 7966 states and 9952 transitions. [2023-11-12 00:42:38,132 INFO L78 Accepts]: Start accepts. Automaton has 7966 states and 9952 transitions. Word has length 120 [2023-11-12 00:42:38,132 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:42:38,132 INFO L495 AbstractCegarLoop]: Abstraction has 7966 states and 9952 transitions. [2023-11-12 00:42:38,132 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 28.333333333333332) internal successors, (85), 3 states have internal predecessors, (85), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2023-11-12 00:42:38,133 INFO L276 IsEmpty]: Start isEmpty. Operand 7966 states and 9952 transitions. [2023-11-12 00:42:38,145 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 123 [2023-11-12 00:42:38,145 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:42:38,146 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:42:38,157 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7185a143-1d39-47a5-9e1d-afd264039b53/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2023-11-12 00:42:38,352 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7185a143-1d39-47a5-9e1d-afd264039b53/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2023-11-12 00:42:38,352 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 00:42:38,352 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:42:38,353 INFO L85 PathProgramCache]: Analyzing trace with hash -1807959159, now seen corresponding path program 1 times [2023-11-12 00:42:38,353 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:42:38,353 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1359538960] [2023-11-12 00:42:38,353 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:42:38,353 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:42:38,378 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:42:38,530 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 25 proven. 20 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2023-11-12 00:42:38,531 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:42:38,531 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1359538960] [2023-11-12 00:42:38,531 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1359538960] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:42:38,531 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1786709294] [2023-11-12 00:42:38,531 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:42:38,531 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:42:38,532 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7185a143-1d39-47a5-9e1d-afd264039b53/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:42:38,533 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7185a143-1d39-47a5-9e1d-afd264039b53/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:42:38,537 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7185a143-1d39-47a5-9e1d-afd264039b53/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2023-11-12 00:42:38,681 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:42:38,684 INFO L262 TraceCheckSpWp]: Trace formula consists of 539 conjuncts, 5 conjunts are in the unsatisfiable core [2023-11-12 00:42:38,687 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:42:38,716 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 62 proven. 0 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2023-11-12 00:42:38,716 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-12 00:42:38,716 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1786709294] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 00:42:38,717 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-12 00:42:38,717 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [6] total 7 [2023-11-12 00:42:38,717 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1076226993] [2023-11-12 00:42:38,717 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 00:42:38,718 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-12 00:42:38,718 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:42:38,719 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-12 00:42:38,719 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2023-11-12 00:42:38,719 INFO L87 Difference]: Start difference. First operand 7966 states and 9952 transitions. Second operand has 4 states, 4 states have (on average 22.75) internal successors, (91), 4 states have internal predecessors, (91), 2 states have call successors, (10), 2 states have call predecessors, (10), 3 states have return successors, (10), 3 states have call predecessors, (10), 2 states have call successors, (10) [2023-11-12 00:42:39,298 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:42:39,299 INFO L93 Difference]: Finished difference Result 11766 states and 14744 transitions. [2023-11-12 00:42:39,299 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-11-12 00:42:39,300 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 22.75) internal successors, (91), 4 states have internal predecessors, (91), 2 states have call successors, (10), 2 states have call predecessors, (10), 3 states have return successors, (10), 3 states have call predecessors, (10), 2 states have call successors, (10) Word has length 122 [2023-11-12 00:42:39,300 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:42:39,323 INFO L225 Difference]: With dead ends: 11766 [2023-11-12 00:42:39,323 INFO L226 Difference]: Without dead ends: 8256 [2023-11-12 00:42:39,334 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 130 GetRequests, 124 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2023-11-12 00:42:39,335 INFO L413 NwaCegarLoop]: 152 mSDtfsCounter, 69 mSDsluCounter, 249 mSDsCounter, 0 mSdLazyCounter, 81 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 69 SdHoareTripleChecker+Valid, 401 SdHoareTripleChecker+Invalid, 84 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 81 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-12 00:42:39,335 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [69 Valid, 401 Invalid, 84 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 81 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-12 00:42:39,347 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8256 states. [2023-11-12 00:42:40,031 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8256 to 8170. [2023-11-12 00:42:40,043 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 8170 states, 6880 states have (on average 1.2819767441860466) internal successors, (8820), 6920 states have internal predecessors, (8820), 674 states have call successors, (674), 579 states have call predecessors, (674), 615 states have return successors, (710), 671 states have call predecessors, (710), 674 states have call successors, (710) [2023-11-12 00:42:40,069 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8170 states to 8170 states and 10204 transitions. [2023-11-12 00:42:40,070 INFO L78 Accepts]: Start accepts. Automaton has 8170 states and 10204 transitions. Word has length 122 [2023-11-12 00:42:40,070 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:42:40,070 INFO L495 AbstractCegarLoop]: Abstraction has 8170 states and 10204 transitions. [2023-11-12 00:42:40,071 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 22.75) internal successors, (91), 4 states have internal predecessors, (91), 2 states have call successors, (10), 2 states have call predecessors, (10), 3 states have return successors, (10), 3 states have call predecessors, (10), 2 states have call successors, (10) [2023-11-12 00:42:40,071 INFO L276 IsEmpty]: Start isEmpty. Operand 8170 states and 10204 transitions. [2023-11-12 00:42:40,084 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2023-11-12 00:42:40,084 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:42:40,085 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:42:40,097 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7185a143-1d39-47a5-9e1d-afd264039b53/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2023-11-12 00:42:40,291 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7185a143-1d39-47a5-9e1d-afd264039b53/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2023-11-12 00:42:40,291 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 00:42:40,291 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:42:40,291 INFO L85 PathProgramCache]: Analyzing trace with hash -964925812, now seen corresponding path program 1 times [2023-11-12 00:42:40,292 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:42:40,292 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [613505475] [2023-11-12 00:42:40,292 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:42:40,292 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:42:40,313 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:42:40,358 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 31 proven. 11 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2023-11-12 00:42:40,358 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:42:40,358 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [613505475] [2023-11-12 00:42:40,359 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [613505475] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:42:40,359 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [870377885] [2023-11-12 00:42:40,359 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:42:40,359 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:42:40,359 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7185a143-1d39-47a5-9e1d-afd264039b53/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:42:40,361 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7185a143-1d39-47a5-9e1d-afd264039b53/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:42:40,380 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7185a143-1d39-47a5-9e1d-afd264039b53/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2023-11-12 00:42:40,509 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:42:40,512 INFO L262 TraceCheckSpWp]: Trace formula consists of 538 conjuncts, 3 conjunts are in the unsatisfiable core [2023-11-12 00:42:40,514 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:42:40,528 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 58 proven. 0 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2023-11-12 00:42:40,528 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-12 00:42:40,528 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [870377885] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 00:42:40,529 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-12 00:42:40,529 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [4] total 4 [2023-11-12 00:42:40,529 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1806958259] [2023-11-12 00:42:40,529 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 00:42:40,530 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-12 00:42:40,530 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:42:40,530 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-12 00:42:40,531 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-12 00:42:40,531 INFO L87 Difference]: Start difference. First operand 8170 states and 10204 transitions. Second operand has 3 states, 3 states have (on average 29.0) internal successors, (87), 3 states have internal predecessors, (87), 3 states have call successors, (10), 3 states have call predecessors, (10), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) [2023-11-12 00:42:41,092 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:42:41,092 INFO L93 Difference]: Finished difference Result 11737 states and 14764 transitions. [2023-11-12 00:42:41,092 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-12 00:42:41,093 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 29.0) internal successors, (87), 3 states have internal predecessors, (87), 3 states have call successors, (10), 3 states have call predecessors, (10), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) Word has length 123 [2023-11-12 00:42:41,093 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:42:41,117 INFO L225 Difference]: With dead ends: 11737 [2023-11-12 00:42:41,117 INFO L226 Difference]: Without dead ends: 7903 [2023-11-12 00:42:41,127 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 126 GetRequests, 124 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-12 00:42:41,128 INFO L413 NwaCegarLoop]: 118 mSDtfsCounter, 22 mSDsluCounter, 102 mSDsCounter, 0 mSdLazyCounter, 46 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 22 SdHoareTripleChecker+Valid, 220 SdHoareTripleChecker+Invalid, 46 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 46 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-12 00:42:41,128 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [22 Valid, 220 Invalid, 46 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 46 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-12 00:42:41,140 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7903 states.