./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/systemc/token_ring.12.cil-1.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version cf1a7837 Calling Ultimate with: /usr/lib/jvm/java-11-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ce818b8-874c-443f-8de7-54cce8ad57bb/bin/utaipan-verify-NcY6lQBIFX/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ce818b8-874c-443f-8de7-54cce8ad57bb/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_5ce818b8-874c-443f-8de7-54cce8ad57bb/bin/utaipan-verify-NcY6lQBIFX/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ce818b8-874c-443f-8de7-54cce8ad57bb/bin/utaipan-verify-NcY6lQBIFX/config/TaipanReach.xml -i ../../sv-benchmarks/c/systemc/token_ring.12.cil-1.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ce818b8-874c-443f-8de7-54cce8ad57bb/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_5ce818b8-874c-443f-8de7-54cce8ad57bb/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 962623ba1d780e7ad35b9b6d7f5839750bc2f361556d46080824a3701cf71595 --- Real Ultimate output --- This is Ultimate 0.2.3-dev-cf1a783 [2023-11-12 01:00:32,345 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-12 01:00:32,500 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ce818b8-874c-443f-8de7-54cce8ad57bb/bin/utaipan-verify-NcY6lQBIFX/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-11-12 01:00:32,513 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-12 01:00:32,514 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-12 01:00:32,558 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-12 01:00:32,559 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-12 01:00:32,560 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-12 01:00:32,561 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-12 01:00:32,566 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-12 01:00:32,567 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-12 01:00:32,568 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-12 01:00:32,568 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-12 01:00:32,570 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-12 01:00:32,571 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-12 01:00:32,571 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-12 01:00:32,572 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-12 01:00:32,572 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-12 01:00:32,573 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-12 01:00:32,573 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-12 01:00:32,575 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-12 01:00:32,576 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-12 01:00:32,577 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-12 01:00:32,577 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-11-12 01:00:32,578 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-12 01:00:32,578 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-12 01:00:32,579 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-12 01:00:32,579 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-12 01:00:32,580 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-11-12 01:00:32,580 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-12 01:00:32,582 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-11-12 01:00:32,582 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-12 01:00:32,582 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-11-12 01:00:32,582 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-12 01:00:32,583 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-12 01:00:32,583 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-12 01:00:32,583 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-12 01:00:32,584 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-12 01:00:32,584 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-12 01:00:32,584 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-11-12 01:00:32,584 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-12 01:00:32,585 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-12 01:00:32,585 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-11-12 01:00:32,585 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-12 01:00:32,586 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-12 01:00:32,586 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_5ce818b8-874c-443f-8de7-54cce8ad57bb/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ce818b8-874c-443f-8de7-54cce8ad57bb/bin/utaipan-verify-NcY6lQBIFX Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 962623ba1d780e7ad35b9b6d7f5839750bc2f361556d46080824a3701cf71595 [2023-11-12 01:00:33,009 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-12 01:00:33,037 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-12 01:00:33,041 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-12 01:00:33,042 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-12 01:00:33,043 INFO L274 PluginConnector]: CDTParser initialized [2023-11-12 01:00:33,046 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ce818b8-874c-443f-8de7-54cce8ad57bb/bin/utaipan-verify-NcY6lQBIFX/../../sv-benchmarks/c/systemc/token_ring.12.cil-1.c [2023-11-12 01:00:36,264 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-12 01:00:36,502 INFO L384 CDTParser]: Found 1 translation units. [2023-11-12 01:00:36,503 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ce818b8-874c-443f-8de7-54cce8ad57bb/sv-benchmarks/c/systemc/token_ring.12.cil-1.c [2023-11-12 01:00:36,520 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ce818b8-874c-443f-8de7-54cce8ad57bb/bin/utaipan-verify-NcY6lQBIFX/data/6f9696d38/a48bd2da93dc4f12a7492a02221facd8/FLAGe9fe97509 [2023-11-12 01:00:36,537 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ce818b8-874c-443f-8de7-54cce8ad57bb/bin/utaipan-verify-NcY6lQBIFX/data/6f9696d38/a48bd2da93dc4f12a7492a02221facd8 [2023-11-12 01:00:36,540 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-12 01:00:36,542 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-12 01:00:36,544 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-12 01:00:36,544 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-12 01:00:36,551 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-12 01:00:36,551 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 12.11 01:00:36" (1/1) ... [2023-11-12 01:00:36,553 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7cb88824 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 01:00:36, skipping insertion in model container [2023-11-12 01:00:36,553 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 12.11 01:00:36" (1/1) ... [2023-11-12 01:00:36,641 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-12 01:00:36,896 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_5ce818b8-874c-443f-8de7-54cce8ad57bb/sv-benchmarks/c/systemc/token_ring.12.cil-1.c[671,684] [2023-11-12 01:00:37,074 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-12 01:00:37,101 INFO L202 MainTranslator]: Completed pre-run [2023-11-12 01:00:37,115 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_5ce818b8-874c-443f-8de7-54cce8ad57bb/sv-benchmarks/c/systemc/token_ring.12.cil-1.c[671,684] [2023-11-12 01:00:37,184 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-12 01:00:37,208 INFO L206 MainTranslator]: Completed translation [2023-11-12 01:00:37,208 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 01:00:37 WrapperNode [2023-11-12 01:00:37,208 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-12 01:00:37,210 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-12 01:00:37,210 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-12 01:00:37,210 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-12 01:00:37,217 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 01:00:37" (1/1) ... [2023-11-12 01:00:37,232 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 01:00:37" (1/1) ... [2023-11-12 01:00:37,288 INFO L138 Inliner]: procedures = 52, calls = 68, calls flagged for inlining = 35, calls inlined = 35, statements flattened = 885 [2023-11-12 01:00:37,289 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-12 01:00:37,290 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-12 01:00:37,290 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-12 01:00:37,290 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-12 01:00:37,303 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 01:00:37" (1/1) ... [2023-11-12 01:00:37,304 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 01:00:37" (1/1) ... [2023-11-12 01:00:37,319 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 01:00:37" (1/1) ... [2023-11-12 01:00:37,319 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 01:00:37" (1/1) ... [2023-11-12 01:00:37,343 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 01:00:37" (1/1) ... [2023-11-12 01:00:37,377 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 01:00:37" (1/1) ... [2023-11-12 01:00:37,381 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 01:00:37" (1/1) ... [2023-11-12 01:00:37,388 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 01:00:37" (1/1) ... [2023-11-12 01:00:37,395 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-12 01:00:37,396 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-12 01:00:37,396 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-12 01:00:37,396 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-12 01:00:37,401 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 01:00:37" (1/1) ... [2023-11-12 01:00:37,410 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-12 01:00:37,424 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ce818b8-874c-443f-8de7-54cce8ad57bb/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 01:00:37,444 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ce818b8-874c-443f-8de7-54cce8ad57bb/bin/utaipan-verify-NcY6lQBIFX/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-12 01:00:37,478 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ce818b8-874c-443f-8de7-54cce8ad57bb/bin/utaipan-verify-NcY6lQBIFX/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-12 01:00:37,490 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-12 01:00:37,490 INFO L130 BoogieDeclarations]: Found specification of procedure activate_threads [2023-11-12 01:00:37,490 INFO L138 BoogieDeclarations]: Found implementation of procedure activate_threads [2023-11-12 01:00:37,491 INFO L130 BoogieDeclarations]: Found specification of procedure immediate_notify [2023-11-12 01:00:37,491 INFO L138 BoogieDeclarations]: Found implementation of procedure immediate_notify [2023-11-12 01:00:37,491 INFO L130 BoogieDeclarations]: Found specification of procedure update_channels [2023-11-12 01:00:37,491 INFO L138 BoogieDeclarations]: Found implementation of procedure update_channels [2023-11-12 01:00:37,491 INFO L130 BoogieDeclarations]: Found specification of procedure error [2023-11-12 01:00:37,491 INFO L138 BoogieDeclarations]: Found implementation of procedure error [2023-11-12 01:00:37,492 INFO L130 BoogieDeclarations]: Found specification of procedure fire_delta_events [2023-11-12 01:00:37,492 INFO L138 BoogieDeclarations]: Found implementation of procedure fire_delta_events [2023-11-12 01:00:37,492 INFO L130 BoogieDeclarations]: Found specification of procedure exists_runnable_thread [2023-11-12 01:00:37,492 INFO L138 BoogieDeclarations]: Found implementation of procedure exists_runnable_thread [2023-11-12 01:00:37,492 INFO L130 BoogieDeclarations]: Found specification of procedure reset_delta_events [2023-11-12 01:00:37,492 INFO L138 BoogieDeclarations]: Found implementation of procedure reset_delta_events [2023-11-12 01:00:37,493 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-12 01:00:37,493 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-12 01:00:37,493 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-12 01:00:37,630 INFO L236 CfgBuilder]: Building ICFG [2023-11-12 01:00:37,632 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-12 01:00:38,677 INFO L277 CfgBuilder]: Performing block encoding [2023-11-12 01:00:39,294 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-12 01:00:39,294 INFO L302 CfgBuilder]: Removed 15 assume(true) statements. [2023-11-12 01:00:39,298 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 12.11 01:00:39 BoogieIcfgContainer [2023-11-12 01:00:39,298 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-12 01:00:39,300 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-12 01:00:39,300 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-12 01:00:39,304 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-12 01:00:39,304 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 12.11 01:00:36" (1/3) ... [2023-11-12 01:00:39,305 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@73772c6d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 12.11 01:00:39, skipping insertion in model container [2023-11-12 01:00:39,305 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 01:00:37" (2/3) ... [2023-11-12 01:00:39,306 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@73772c6d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 12.11 01:00:39, skipping insertion in model container [2023-11-12 01:00:39,306 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 12.11 01:00:39" (3/3) ... [2023-11-12 01:00:39,307 INFO L112 eAbstractionObserver]: Analyzing ICFG token_ring.12.cil-1.c [2023-11-12 01:00:39,328 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-12 01:00:39,329 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-11-12 01:00:39,387 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-12 01:00:39,394 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;@160edae8, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-12 01:00:39,394 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-11-12 01:00:39,401 INFO L276 IsEmpty]: Start isEmpty. Operand has 207 states, 170 states have (on average 1.5235294117647058) internal successors, (259), 174 states have internal predecessors, (259), 28 states have call successors, (28), 7 states have call predecessors, (28), 7 states have return successors, (28), 27 states have call predecessors, (28), 28 states have call successors, (28) [2023-11-12 01:00:39,413 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2023-11-12 01:00:39,413 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 01:00:39,414 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, 1, 1, 1, 1, 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 01:00:39,415 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 01:00:39,420 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 01:00:39,420 INFO L85 PathProgramCache]: Analyzing trace with hash -542008476, now seen corresponding path program 1 times [2023-11-12 01:00:39,431 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 01:00:39,431 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1112989146] [2023-11-12 01:00:39,432 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 01:00:39,432 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 01:00:39,693 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 01:00:40,031 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 01:00:40,032 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 01:00:40,032 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1112989146] [2023-11-12 01:00:40,033 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1112989146] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 01:00:40,033 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-12 01:00:40,034 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-11-12 01:00:40,036 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [30307726] [2023-11-12 01:00:40,037 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 01:00:40,042 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-12 01:00:40,042 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 01:00:40,073 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-12 01:00:40,074 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-12 01:00:40,077 INFO L87 Difference]: Start difference. First operand has 207 states, 170 states have (on average 1.5235294117647058) internal successors, (259), 174 states have internal predecessors, (259), 28 states have call successors, (28), 7 states have call predecessors, (28), 7 states have return successors, (28), 27 states have call predecessors, (28), 28 states have call successors, (28) Second operand has 4 states, 4 states have (on average 14.0) internal successors, (56), 4 states have internal predecessors, (56), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2023-11-12 01:00:40,783 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 01:00:40,783 INFO L93 Difference]: Finished difference Result 598 states and 927 transitions. [2023-11-12 01:00:40,784 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-12 01:00:40,786 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 14.0) internal successors, (56), 4 states have internal predecessors, (56), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) Word has length 67 [2023-11-12 01:00:40,786 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 01:00:40,800 INFO L225 Difference]: With dead ends: 598 [2023-11-12 01:00:40,800 INFO L226 Difference]: Without dead ends: 392 [2023-11-12 01:00:40,806 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 01:00:40,810 INFO L413 NwaCegarLoop]: 487 mSDtfsCounter, 546 mSDsluCounter, 387 mSDsCounter, 0 mSdLazyCounter, 308 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 546 SdHoareTripleChecker+Valid, 874 SdHoareTripleChecker+Invalid, 319 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 308 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-11-12 01:00:40,811 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [546 Valid, 874 Invalid, 319 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 308 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-11-12 01:00:40,833 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 392 states. [2023-11-12 01:00:40,939 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 392 to 391. [2023-11-12 01:00:40,945 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 391 states, 328 states have (on average 1.4878048780487805) internal successors, (488), 331 states have internal predecessors, (488), 50 states have call successors, (50), 13 states have call predecessors, (50), 12 states have return successors, (48), 47 states have call predecessors, (48), 48 states have call successors, (48) [2023-11-12 01:00:40,951 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 391 states to 391 states and 586 transitions. [2023-11-12 01:00:40,953 INFO L78 Accepts]: Start accepts. Automaton has 391 states and 586 transitions. Word has length 67 [2023-11-12 01:00:40,954 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 01:00:40,954 INFO L495 AbstractCegarLoop]: Abstraction has 391 states and 586 transitions. [2023-11-12 01:00:40,955 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 14.0) internal successors, (56), 4 states have internal predecessors, (56), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2023-11-12 01:00:40,956 INFO L276 IsEmpty]: Start isEmpty. Operand 391 states and 586 transitions. [2023-11-12 01:00:40,972 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2023-11-12 01:00:40,974 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 01:00:40,976 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, 2, 2, 2, 2, 2, 2, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 01:00:40,976 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-12 01:00:40,977 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 01:00:40,977 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 01:00:40,978 INFO L85 PathProgramCache]: Analyzing trace with hash -1539494569, now seen corresponding path program 1 times [2023-11-12 01:00:40,978 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 01:00:40,979 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1074854060] [2023-11-12 01:00:40,979 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 01:00:40,979 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 01:00:41,034 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 01:00:41,408 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2023-11-12 01:00:41,409 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 01:00:41,410 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1074854060] [2023-11-12 01:00:41,410 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1074854060] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 01:00:41,410 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [584158182] [2023-11-12 01:00:41,411 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 01:00:41,411 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 01:00:41,411 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ce818b8-874c-443f-8de7-54cce8ad57bb/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 01:00:41,415 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ce818b8-874c-443f-8de7-54cce8ad57bb/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 01:00:41,436 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ce818b8-874c-443f-8de7-54cce8ad57bb/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-12 01:00:41,726 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 01:00:41,733 INFO L262 TraceCheckSpWp]: Trace formula consists of 990 conjuncts, 2 conjunts are in the unsatisfiable core [2023-11-12 01:00:41,745 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 01:00:41,834 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 39 trivial. 0 not checked. [2023-11-12 01:00:41,834 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-12 01:00:41,834 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [584158182] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 01:00:41,835 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-12 01:00:41,835 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2023-11-12 01:00:41,836 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1762767879] [2023-11-12 01:00:41,836 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 01:00:41,837 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-12 01:00:41,837 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 01:00:41,838 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-12 01:00:41,838 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-12 01:00:41,839 INFO L87 Difference]: Start difference. First operand 391 states and 586 transitions. Second operand has 3 states, 3 states have (on average 28.333333333333332) internal successors, (85), 2 states have internal predecessors, (85), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-11-12 01:00:42,078 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 01:00:42,079 INFO L93 Difference]: Finished difference Result 1156 states and 1761 transitions. [2023-11-12 01:00:42,079 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-12 01:00:42,080 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 28.333333333333332) internal successors, (85), 2 states have internal predecessors, (85), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 137 [2023-11-12 01:00:42,080 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 01:00:42,089 INFO L225 Difference]: With dead ends: 1156 [2023-11-12 01:00:42,090 INFO L226 Difference]: Without dead ends: 770 [2023-11-12 01:00:42,092 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 141 GetRequests, 137 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-12 01:00:42,094 INFO L413 NwaCegarLoop]: 314 mSDtfsCounter, 280 mSDsluCounter, 246 mSDsCounter, 0 mSdLazyCounter, 106 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 280 SdHoareTripleChecker+Valid, 560 SdHoareTripleChecker+Invalid, 108 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 106 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-12 01:00:42,095 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [280 Valid, 560 Invalid, 108 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 106 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-12 01:00:42,099 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 770 states. [2023-11-12 01:00:42,146 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 770 to 764. [2023-11-12 01:00:42,149 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 764 states, 647 states have (on average 1.4853168469860896) internal successors, (961), 651 states have internal predecessors, (961), 92 states have call successors, (92), 25 states have call predecessors, (92), 24 states have return successors, (90), 88 states have call predecessors, (90), 90 states have call successors, (90) [2023-11-12 01:00:42,155 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 764 states to 764 states and 1143 transitions. [2023-11-12 01:00:42,155 INFO L78 Accepts]: Start accepts. Automaton has 764 states and 1143 transitions. Word has length 137 [2023-11-12 01:00:42,156 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 01:00:42,156 INFO L495 AbstractCegarLoop]: Abstraction has 764 states and 1143 transitions. [2023-11-12 01:00:42,156 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 28.333333333333332) internal successors, (85), 2 states have internal predecessors, (85), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-11-12 01:00:42,157 INFO L276 IsEmpty]: Start isEmpty. Operand 764 states and 1143 transitions. [2023-11-12 01:00:42,166 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2023-11-12 01:00:42,167 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 01:00:42,167 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, 2, 2, 2, 2, 2, 2, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 01:00:42,181 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ce818b8-874c-443f-8de7-54cce8ad57bb/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2023-11-12 01:00:42,376 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ce818b8-874c-443f-8de7-54cce8ad57bb/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 01:00:42,376 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 01:00:42,378 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 01:00:42,378 INFO L85 PathProgramCache]: Analyzing trace with hash -1388217225, now seen corresponding path program 1 times [2023-11-12 01:00:42,378 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 01:00:42,379 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1261633629] [2023-11-12 01:00:42,379 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 01:00:42,379 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 01:00:42,451 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 01:00:42,760 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2023-11-12 01:00:42,761 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 01:00:42,761 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1261633629] [2023-11-12 01:00:42,761 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1261633629] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 01:00:42,762 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [501848804] [2023-11-12 01:00:42,762 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 01:00:42,762 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 01:00:42,762 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ce818b8-874c-443f-8de7-54cce8ad57bb/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 01:00:42,764 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ce818b8-874c-443f-8de7-54cce8ad57bb/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 01:00:42,784 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ce818b8-874c-443f-8de7-54cce8ad57bb/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-12 01:00:43,044 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 01:00:43,050 INFO L262 TraceCheckSpWp]: Trace formula consists of 984 conjuncts, 2 conjunts are in the unsatisfiable core [2023-11-12 01:00:43,058 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 01:00:43,098 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2023-11-12 01:00:43,098 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-12 01:00:43,099 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [501848804] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 01:00:43,099 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-12 01:00:43,099 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2023-11-12 01:00:43,099 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [164648021] [2023-11-12 01:00:43,100 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 01:00:43,100 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-12 01:00:43,100 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 01:00:43,101 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-12 01:00:43,101 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-12 01:00:43,102 INFO L87 Difference]: Start difference. First operand 764 states and 1143 transitions. Second operand has 3 states, 3 states have (on average 27.333333333333332) internal successors, (82), 2 states have internal predecessors, (82), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-11-12 01:00:43,355 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 01:00:43,355 INFO L93 Difference]: Finished difference Result 2269 states and 3450 transitions. [2023-11-12 01:00:43,356 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-12 01:00:43,356 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 27.333333333333332) internal successors, (82), 2 states have internal predecessors, (82), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 137 [2023-11-12 01:00:43,356 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 01:00:43,368 INFO L225 Difference]: With dead ends: 2269 [2023-11-12 01:00:43,368 INFO L226 Difference]: Without dead ends: 1510 [2023-11-12 01:00:43,372 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 141 GetRequests, 137 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-12 01:00:43,374 INFO L413 NwaCegarLoop]: 312 mSDtfsCounter, 283 mSDsluCounter, 246 mSDsCounter, 0 mSdLazyCounter, 106 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 283 SdHoareTripleChecker+Valid, 558 SdHoareTripleChecker+Invalid, 108 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 106 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-12 01:00:43,374 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [283 Valid, 558 Invalid, 108 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 106 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-12 01:00:43,377 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1510 states. [2023-11-12 01:00:43,453 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1510 to 1502. [2023-11-12 01:00:43,457 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1502 states, 1279 states have (on average 1.4816262705238468) internal successors, (1895), 1285 states have internal predecessors, (1895), 174 states have call successors, (174), 49 states have call predecessors, (174), 48 states have return successors, (172), 168 states have call predecessors, (172), 172 states have call successors, (172) [2023-11-12 01:00:43,470 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1502 states to 1502 states and 2241 transitions. [2023-11-12 01:00:43,470 INFO L78 Accepts]: Start accepts. Automaton has 1502 states and 2241 transitions. Word has length 137 [2023-11-12 01:00:43,470 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 01:00:43,471 INFO L495 AbstractCegarLoop]: Abstraction has 1502 states and 2241 transitions. [2023-11-12 01:00:43,471 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 27.333333333333332) internal successors, (82), 2 states have internal predecessors, (82), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-11-12 01:00:43,471 INFO L276 IsEmpty]: Start isEmpty. Operand 1502 states and 2241 transitions. [2023-11-12 01:00:43,477 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2023-11-12 01:00:43,478 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 01:00:43,478 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, 2, 2, 2, 2, 2, 2, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 01:00:43,490 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ce818b8-874c-443f-8de7-54cce8ad57bb/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-11-12 01:00:43,685 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ce818b8-874c-443f-8de7-54cce8ad57bb/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 01:00:43,686 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 01:00:43,686 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 01:00:43,687 INFO L85 PathProgramCache]: Analyzing trace with hash -105555625, now seen corresponding path program 1 times [2023-11-12 01:00:43,687 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 01:00:43,687 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1265246396] [2023-11-12 01:00:43,687 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 01:00:43,688 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 01:00:43,762 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 01:00:43,895 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2023-11-12 01:00:43,895 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 01:00:43,895 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1265246396] [2023-11-12 01:00:43,896 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1265246396] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 01:00:43,896 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1993313116] [2023-11-12 01:00:43,896 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 01:00:43,896 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 01:00:43,897 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ce818b8-874c-443f-8de7-54cce8ad57bb/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 01:00:43,898 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ce818b8-874c-443f-8de7-54cce8ad57bb/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 01:00:43,930 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ce818b8-874c-443f-8de7-54cce8ad57bb/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-12 01:00:44,189 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 01:00:44,194 INFO L262 TraceCheckSpWp]: Trace formula consists of 978 conjuncts, 2 conjunts are in the unsatisfiable core [2023-11-12 01:00:44,200 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 01:00:44,297 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 29 proven. 0 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2023-11-12 01:00:44,297 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-12 01:00:44,298 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1993313116] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 01:00:44,298 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-12 01:00:44,298 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [4] total 5 [2023-11-12 01:00:44,299 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2015193524] [2023-11-12 01:00:44,299 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 01:00:44,299 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-12 01:00:44,300 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 01:00:44,300 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-12 01:00:44,301 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-11-12 01:00:44,301 INFO L87 Difference]: Start difference. First operand 1502 states and 2241 transitions. Second operand has 3 states, 3 states have (on average 34.333333333333336) internal successors, (103), 2 states have internal predecessors, (103), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-11-12 01:00:44,592 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 01:00:44,592 INFO L93 Difference]: Finished difference Result 4471 states and 6778 transitions. [2023-11-12 01:00:44,593 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-12 01:00:44,593 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 34.333333333333336) internal successors, (103), 2 states have internal predecessors, (103), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 137 [2023-11-12 01:00:44,594 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 01:00:44,617 INFO L225 Difference]: With dead ends: 4471 [2023-11-12 01:00:44,617 INFO L226 Difference]: Without dead ends: 2974 [2023-11-12 01:00:44,624 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 137 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 01:00:44,626 INFO L413 NwaCegarLoop]: 255 mSDtfsCounter, 262 mSDsluCounter, 246 mSDsCounter, 0 mSdLazyCounter, 102 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 262 SdHoareTripleChecker+Valid, 501 SdHoareTripleChecker+Invalid, 104 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 102 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-12 01:00:44,626 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [262 Valid, 501 Invalid, 104 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 102 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-12 01:00:44,631 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2974 states. [2023-11-12 01:00:44,852 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2974 to 2962. [2023-11-12 01:00:44,859 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2962 states, 2531 states have (on average 1.477281706835243) internal successors, (3739), 2541 states have internal predecessors, (3739), 334 states have call successors, (334), 97 states have call predecessors, (334), 96 states have return successors, (332), 324 states have call predecessors, (332), 332 states have call successors, (332) [2023-11-12 01:00:44,885 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2962 states to 2962 states and 4405 transitions. [2023-11-12 01:00:44,886 INFO L78 Accepts]: Start accepts. Automaton has 2962 states and 4405 transitions. Word has length 137 [2023-11-12 01:00:44,886 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 01:00:44,887 INFO L495 AbstractCegarLoop]: Abstraction has 2962 states and 4405 transitions. [2023-11-12 01:00:44,887 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 34.333333333333336) internal successors, (103), 2 states have internal predecessors, (103), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-11-12 01:00:44,887 INFO L276 IsEmpty]: Start isEmpty. Operand 2962 states and 4405 transitions. [2023-11-12 01:00:44,899 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2023-11-12 01:00:44,900 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 01:00:44,900 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, 2, 2, 2, 2, 2, 2, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 01:00:44,912 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ce818b8-874c-443f-8de7-54cce8ad57bb/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-11-12 01:00:45,107 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ce818b8-874c-443f-8de7-54cce8ad57bb/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 01:00:45,107 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 01:00:45,107 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 01:00:45,108 INFO L85 PathProgramCache]: Analyzing trace with hash 789917815, now seen corresponding path program 1 times [2023-11-12 01:00:45,108 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 01:00:45,108 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [403626580] [2023-11-12 01:00:45,108 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 01:00:45,109 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 01:00:45,148 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 01:00:45,266 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2023-11-12 01:00:45,266 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 01:00:45,267 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [403626580] [2023-11-12 01:00:45,267 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [403626580] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 01:00:45,267 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [308124008] [2023-11-12 01:00:45,267 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 01:00:45,267 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 01:00:45,268 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ce818b8-874c-443f-8de7-54cce8ad57bb/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 01:00:45,269 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ce818b8-874c-443f-8de7-54cce8ad57bb/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 01:00:45,294 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ce818b8-874c-443f-8de7-54cce8ad57bb/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-11-12 01:00:45,569 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 01:00:45,574 INFO L262 TraceCheckSpWp]: Trace formula consists of 972 conjuncts, 2 conjunts are in the unsatisfiable core [2023-11-12 01:00:45,578 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 01:00:45,623 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 17 proven. 0 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2023-11-12 01:00:45,624 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-12 01:00:45,624 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [308124008] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 01:00:45,624 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-12 01:00:45,624 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [4] total 4 [2023-11-12 01:00:45,625 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [467749860] [2023-11-12 01:00:45,625 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 01:00:45,625 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-12 01:00:45,626 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 01:00:45,626 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-12 01:00:45,627 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-12 01:00:45,627 INFO L87 Difference]: Start difference. First operand 2962 states and 4405 transitions. Second operand has 3 states, 3 states have (on average 30.333333333333332) internal successors, (91), 2 states have internal predecessors, (91), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-11-12 01:00:46,039 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 01:00:46,040 INFO L93 Difference]: Finished difference Result 8827 states and 13334 transitions. [2023-11-12 01:00:46,040 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-12 01:00:46,041 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 30.333333333333332) internal successors, (91), 2 states have internal predecessors, (91), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 137 [2023-11-12 01:00:46,041 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 01:00:46,086 INFO L225 Difference]: With dead ends: 8827 [2023-11-12 01:00:46,086 INFO L226 Difference]: Without dead ends: 5870 [2023-11-12 01:00:46,101 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 138 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 01:00:46,104 INFO L413 NwaCegarLoop]: 255 mSDtfsCounter, 274 mSDsluCounter, 246 mSDsCounter, 0 mSdLazyCounter, 102 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 274 SdHoareTripleChecker+Valid, 501 SdHoareTripleChecker+Invalid, 104 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 102 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-12 01:00:46,104 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [274 Valid, 501 Invalid, 104 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 102 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-12 01:00:46,113 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5870 states. [2023-11-12 01:00:46,411 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5870 to 5850. [2023-11-12 01:00:46,424 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5850 states, 5011 states have (on average 1.4725603671921772) internal successors, (7379), 5029 states have internal predecessors, (7379), 646 states have call successors, (646), 193 states have call predecessors, (646), 192 states have return successors, (644), 628 states have call predecessors, (644), 644 states have call successors, (644) [2023-11-12 01:00:46,455 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5850 states to 5850 states and 8669 transitions. [2023-11-12 01:00:46,456 INFO L78 Accepts]: Start accepts. Automaton has 5850 states and 8669 transitions. Word has length 137 [2023-11-12 01:00:46,456 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 01:00:46,456 INFO L495 AbstractCegarLoop]: Abstraction has 5850 states and 8669 transitions. [2023-11-12 01:00:46,456 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 30.333333333333332) internal successors, (91), 2 states have internal predecessors, (91), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-11-12 01:00:46,457 INFO L276 IsEmpty]: Start isEmpty. Operand 5850 states and 8669 transitions. [2023-11-12 01:00:46,472 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2023-11-12 01:00:46,472 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 01:00:46,472 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, 2, 2, 2, 2, 2, 2, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 01:00:46,485 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ce818b8-874c-443f-8de7-54cce8ad57bb/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-11-12 01:00:46,680 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ce818b8-874c-443f-8de7-54cce8ad57bb/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 01:00:46,680 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 01:00:46,680 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 01:00:46,681 INFO L85 PathProgramCache]: Analyzing trace with hash 684414871, now seen corresponding path program 1 times [2023-11-12 01:00:46,681 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 01:00:46,681 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1163592799] [2023-11-12 01:00:46,681 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 01:00:46,681 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 01:00:46,738 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 01:00:46,863 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2023-11-12 01:00:46,864 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 01:00:46,864 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1163592799] [2023-11-12 01:00:46,864 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1163592799] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 01:00:46,864 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [463047766] [2023-11-12 01:00:46,865 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 01:00:46,865 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 01:00:46,865 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ce818b8-874c-443f-8de7-54cce8ad57bb/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 01:00:46,866 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ce818b8-874c-443f-8de7-54cce8ad57bb/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 01:00:46,896 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ce818b8-874c-443f-8de7-54cce8ad57bb/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-11-12 01:00:47,126 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 01:00:47,131 INFO L262 TraceCheckSpWp]: Trace formula consists of 966 conjuncts, 2 conjunts are in the unsatisfiable core [2023-11-12 01:00:47,136 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 01:00:47,216 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 38 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-11-12 01:00:47,216 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-12 01:00:47,217 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [463047766] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 01:00:47,217 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-12 01:00:47,217 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [4] total 5 [2023-11-12 01:00:47,217 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1586912125] [2023-11-12 01:00:47,218 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 01:00:47,218 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-12 01:00:47,218 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 01:00:47,219 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-12 01:00:47,219 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-11-12 01:00:47,219 INFO L87 Difference]: Start difference. First operand 5850 states and 8669 transitions. Second operand has 3 states, 3 states have (on average 37.333333333333336) internal successors, (112), 2 states have internal predecessors, (112), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-11-12 01:00:47,760 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 01:00:47,760 INFO L93 Difference]: Finished difference Result 17443 states and 26246 transitions. [2023-11-12 01:00:47,761 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-12 01:00:47,762 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 37.333333333333336) internal successors, (112), 2 states have internal predecessors, (112), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 137 [2023-11-12 01:00:47,763 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 01:00:47,850 INFO L225 Difference]: With dead ends: 17443 [2023-11-12 01:00:47,850 INFO L226 Difference]: Without dead ends: 11598 [2023-11-12 01:00:47,876 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 137 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 01:00:47,879 INFO L413 NwaCegarLoop]: 255 mSDtfsCounter, 253 mSDsluCounter, 246 mSDsCounter, 0 mSdLazyCounter, 102 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 253 SdHoareTripleChecker+Valid, 501 SdHoareTripleChecker+Invalid, 104 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 102 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-12 01:00:47,880 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [253 Valid, 501 Invalid, 104 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 102 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-12 01:00:47,899 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11598 states. [2023-11-12 01:00:48,491 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11598 to 11562. [2023-11-12 01:00:48,614 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 11562 states, 9923 states have (on average 1.46760052403507) internal successors, (14563), 9957 states have internal predecessors, (14563), 1254 states have call successors, (1254), 385 states have call predecessors, (1254), 384 states have return successors, (1252), 1220 states have call predecessors, (1252), 1252 states have call successors, (1252) [2023-11-12 01:00:48,693 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11562 states to 11562 states and 17069 transitions. [2023-11-12 01:00:48,694 INFO L78 Accepts]: Start accepts. Automaton has 11562 states and 17069 transitions. Word has length 137 [2023-11-12 01:00:48,694 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 01:00:48,694 INFO L495 AbstractCegarLoop]: Abstraction has 11562 states and 17069 transitions. [2023-11-12 01:00:48,696 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 37.333333333333336) internal successors, (112), 2 states have internal predecessors, (112), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-11-12 01:00:48,696 INFO L276 IsEmpty]: Start isEmpty. Operand 11562 states and 17069 transitions. [2023-11-12 01:00:48,722 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2023-11-12 01:00:48,723 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 01:00:48,723 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, 2, 2, 2, 2, 2, 2, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 01:00:48,731 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ce818b8-874c-443f-8de7-54cce8ad57bb/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2023-11-12 01:00:48,931 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ce818b8-874c-443f-8de7-54cce8ad57bb/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 01:00:48,932 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 01:00:48,932 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 01:00:48,932 INFO L85 PathProgramCache]: Analyzing trace with hash -2105082761, now seen corresponding path program 1 times [2023-11-12 01:00:48,933 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 01:00:48,933 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1968657819] [2023-11-12 01:00:48,933 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 01:00:48,933 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 01:00:48,967 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 01:00:49,088 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2023-11-12 01:00:49,088 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 01:00:49,088 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1968657819] [2023-11-12 01:00:49,088 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1968657819] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 01:00:49,089 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [909133717] [2023-11-12 01:00:49,089 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 01:00:49,089 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 01:00:49,089 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ce818b8-874c-443f-8de7-54cce8ad57bb/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 01:00:49,090 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ce818b8-874c-443f-8de7-54cce8ad57bb/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 01:00:49,099 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ce818b8-874c-443f-8de7-54cce8ad57bb/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-11-12 01:00:49,369 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 01:00:49,375 INFO L262 TraceCheckSpWp]: Trace formula consists of 960 conjuncts, 2 conjunts are in the unsatisfiable core [2023-11-12 01:00:49,380 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 01:00:49,464 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 35 proven. 0 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2023-11-12 01:00:49,465 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-12 01:00:49,465 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [909133717] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 01:00:49,465 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-12 01:00:49,466 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [4] total 5 [2023-11-12 01:00:49,466 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1932750492] [2023-11-12 01:00:49,466 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 01:00:49,467 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-12 01:00:49,467 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 01:00:49,468 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-12 01:00:49,468 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-11-12 01:00:49,469 INFO L87 Difference]: Start difference. First operand 11562 states and 17069 transitions. Second operand has 3 states, 3 states have (on average 36.333333333333336) internal successors, (109), 2 states have internal predecessors, (109), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-11-12 01:00:50,549 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 01:00:50,549 INFO L93 Difference]: Finished difference Result 34483 states and 51670 transitions. [2023-11-12 01:00:50,550 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-12 01:00:50,550 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 36.333333333333336) internal successors, (109), 2 states have internal predecessors, (109), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 137 [2023-11-12 01:00:50,551 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 01:00:50,679 INFO L225 Difference]: With dead ends: 34483 [2023-11-12 01:00:50,680 INFO L226 Difference]: Without dead ends: 22926 [2023-11-12 01:00:50,720 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 137 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 01:00:50,721 INFO L413 NwaCegarLoop]: 255 mSDtfsCounter, 256 mSDsluCounter, 246 mSDsCounter, 0 mSdLazyCounter, 102 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 256 SdHoareTripleChecker+Valid, 501 SdHoareTripleChecker+Invalid, 104 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 102 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-12 01:00:50,721 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [256 Valid, 501 Invalid, 104 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 102 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-12 01:00:50,754 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22926 states. [2023-11-12 01:00:52,016 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22926 to 22858. [2023-11-12 01:00:52,059 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22858 states, 19651 states have (on average 1.4624701033026308) internal successors, (28739), 19717 states have internal predecessors, (28739), 2438 states have call successors, (2438), 769 states have call predecessors, (2438), 768 states have return successors, (2436), 2372 states have call predecessors, (2436), 2436 states have call successors, (2436) [2023-11-12 01:00:52,179 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22858 states to 22858 states and 33613 transitions. [2023-11-12 01:00:52,181 INFO L78 Accepts]: Start accepts. Automaton has 22858 states and 33613 transitions. Word has length 137 [2023-11-12 01:00:52,182 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 01:00:52,182 INFO L495 AbstractCegarLoop]: Abstraction has 22858 states and 33613 transitions. [2023-11-12 01:00:52,182 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 36.333333333333336) internal successors, (109), 2 states have internal predecessors, (109), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-11-12 01:00:52,183 INFO L276 IsEmpty]: Start isEmpty. Operand 22858 states and 33613 transitions. [2023-11-12 01:00:52,231 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2023-11-12 01:00:52,231 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 01:00:52,231 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, 2, 2, 2, 2, 2, 2, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 01:00:52,240 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ce818b8-874c-443f-8de7-54cce8ad57bb/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2023-11-12 01:00:52,439 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ce818b8-874c-443f-8de7-54cce8ad57bb/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 01:00:52,440 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 01:00:52,440 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 01:00:52,440 INFO L85 PathProgramCache]: Analyzing trace with hash -706827369, now seen corresponding path program 1 times [2023-11-12 01:00:52,440 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 01:00:52,440 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1401014786] [2023-11-12 01:00:52,441 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 01:00:52,441 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 01:00:52,478 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 01:00:52,708 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2023-11-12 01:00:52,709 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 01:00:52,709 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1401014786] [2023-11-12 01:00:52,709 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1401014786] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 01:00:52,709 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1520116367] [2023-11-12 01:00:52,709 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 01:00:52,710 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 01:00:52,710 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ce818b8-874c-443f-8de7-54cce8ad57bb/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 01:00:52,711 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ce818b8-874c-443f-8de7-54cce8ad57bb/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 01:00:52,742 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ce818b8-874c-443f-8de7-54cce8ad57bb/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-11-12 01:00:52,997 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 01:00:53,003 INFO L262 TraceCheckSpWp]: Trace formula consists of 954 conjuncts, 2 conjunts are in the unsatisfiable core [2023-11-12 01:00:53,007 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 01:00:53,063 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 23 proven. 0 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2023-11-12 01:00:53,063 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-12 01:00:53,063 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1520116367] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 01:00:53,064 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-12 01:00:53,064 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [4] total 4 [2023-11-12 01:00:53,064 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [450581131] [2023-11-12 01:00:53,064 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 01:00:53,065 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-12 01:00:53,065 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 01:00:53,066 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-12 01:00:53,066 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-12 01:00:53,066 INFO L87 Difference]: Start difference. First operand 22858 states and 33613 transitions. Second operand has 3 states, 3 states have (on average 32.333333333333336) internal successors, (97), 2 states have internal predecessors, (97), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-11-12 01:00:54,952 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 01:00:54,952 INFO L93 Difference]: Finished difference Result 68179 states and 101718 transitions. [2023-11-12 01:00:54,953 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-12 01:00:54,953 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 32.333333333333336) internal successors, (97), 2 states have internal predecessors, (97), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 137 [2023-11-12 01:00:54,954 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 01:00:55,160 INFO L225 Difference]: With dead ends: 68179 [2023-11-12 01:00:55,160 INFO L226 Difference]: Without dead ends: 45326 [2023-11-12 01:00:55,250 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 138 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 01:00:55,252 INFO L413 NwaCegarLoop]: 255 mSDtfsCounter, 268 mSDsluCounter, 246 mSDsCounter, 0 mSdLazyCounter, 102 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 268 SdHoareTripleChecker+Valid, 501 SdHoareTripleChecker+Invalid, 104 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 102 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-12 01:00:55,252 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [268 Valid, 501 Invalid, 104 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 102 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-12 01:00:55,304 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45326 states. [2023-11-12 01:00:57,387 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45326 to 45194. [2023-11-12 01:00:57,461 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45194 states, 38915 states have (on average 1.4572015932159836) internal successors, (56707), 39045 states have internal predecessors, (56707), 4742 states have call successors, (4742), 1537 states have call predecessors, (4742), 1536 states have return successors, (4740), 4612 states have call predecessors, (4740), 4740 states have call successors, (4740) [2023-11-12 01:00:57,983 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45194 states to 45194 states and 66189 transitions. [2023-11-12 01:00:57,987 INFO L78 Accepts]: Start accepts. Automaton has 45194 states and 66189 transitions. Word has length 137 [2023-11-12 01:00:57,987 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 01:00:57,988 INFO L495 AbstractCegarLoop]: Abstraction has 45194 states and 66189 transitions. [2023-11-12 01:00:57,988 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 32.333333333333336) internal successors, (97), 2 states have internal predecessors, (97), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-11-12 01:00:57,988 INFO L276 IsEmpty]: Start isEmpty. Operand 45194 states and 66189 transitions. [2023-11-12 01:00:58,084 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2023-11-12 01:00:58,084 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 01:00:58,085 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, 2, 2, 2, 2, 2, 2, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 01:00:58,097 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ce818b8-874c-443f-8de7-54cce8ad57bb/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2023-11-12 01:00:58,296 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ce818b8-874c-443f-8de7-54cce8ad57bb/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 01:00:58,297 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 01:00:58,297 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 01:00:58,297 INFO L85 PathProgramCache]: Analyzing trace with hash 1082698423, now seen corresponding path program 1 times [2023-11-12 01:00:58,297 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 01:00:58,298 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [165219325] [2023-11-12 01:00:58,298 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 01:00:58,298 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 01:00:58,356 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 01:00:59,319 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 43 trivial. 0 not checked. [2023-11-12 01:00:59,320 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 01:00:59,320 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [165219325] [2023-11-12 01:00:59,320 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [165219325] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 01:00:59,321 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-12 01:00:59,321 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2023-11-12 01:00:59,321 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [551048221] [2023-11-12 01:00:59,321 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 01:00:59,322 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-11-12 01:00:59,322 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 01:00:59,323 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-11-12 01:00:59,323 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2023-11-12 01:00:59,324 INFO L87 Difference]: Start difference. First operand 45194 states and 66189 transitions. Second operand has 6 states, 6 states have (on average 13.166666666666666) internal successors, (79), 6 states have internal predecessors, (79), 4 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2023-11-12 01:01:03,203 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 01:01:03,203 INFO L93 Difference]: Finished difference Result 145682 states and 214163 transitions. [2023-11-12 01:01:03,204 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-11-12 01:01:03,204 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 13.166666666666666) internal successors, (79), 6 states have internal predecessors, (79), 4 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) Word has length 137 [2023-11-12 01:01:03,205 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 01:01:03,840 INFO L225 Difference]: With dead ends: 145682 [2023-11-12 01:01:03,841 INFO L226 Difference]: Without dead ends: 100494 [2023-11-12 01:01:03,959 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 01:01:03,962 INFO L413 NwaCegarLoop]: 281 mSDtfsCounter, 882 mSDsluCounter, 499 mSDsCounter, 0 mSdLazyCounter, 323 mSolverCounterSat, 109 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 903 SdHoareTripleChecker+Valid, 780 SdHoareTripleChecker+Invalid, 432 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 109 IncrementalHoareTripleChecker+Valid, 323 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2023-11-12 01:01:03,963 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [903 Valid, 780 Invalid, 432 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [109 Valid, 323 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2023-11-12 01:01:04,066 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100494 states. [2023-11-12 01:01:08,378 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100494 to 88842. [2023-11-12 01:01:08,471 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 88842 states, 76547 states have (on average 1.4514873215148862) internal successors, (111107), 76805 states have internal predecessors, (111107), 9222 states have call successors, (9222), 3073 states have call predecessors, (9222), 3072 states have return successors, (9220), 8964 states have call predecessors, (9220), 9220 states have call successors, (9220) [2023-11-12 01:01:08,938 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88842 states to 88842 states and 129549 transitions. [2023-11-12 01:01:08,944 INFO L78 Accepts]: Start accepts. Automaton has 88842 states and 129549 transitions. Word has length 137 [2023-11-12 01:01:08,945 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 01:01:08,945 INFO L495 AbstractCegarLoop]: Abstraction has 88842 states and 129549 transitions. [2023-11-12 01:01:08,946 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 13.166666666666666) internal successors, (79), 6 states have internal predecessors, (79), 4 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2023-11-12 01:01:08,946 INFO L276 IsEmpty]: Start isEmpty. Operand 88842 states and 129549 transitions. [2023-11-12 01:01:09,139 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 161 [2023-11-12 01:01:09,139 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 01:01:09,140 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, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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, 1, 1, 1, 1, 1] [2023-11-12 01:01:09,140 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2023-11-12 01:01:09,141 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 01:01:09,141 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 01:01:09,141 INFO L85 PathProgramCache]: Analyzing trace with hash -503215806, now seen corresponding path program 1 times [2023-11-12 01:01:09,142 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 01:01:09,142 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [730366181] [2023-11-12 01:01:09,142 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 01:01:09,142 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 01:01:09,476 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 01:01:09,897 INFO L134 CoverageAnalysis]: Checked inductivity of 76 backedges. 10 proven. 41 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2023-11-12 01:01:09,898 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 01:01:09,900 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [730366181] [2023-11-12 01:01:09,900 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [730366181] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 01:01:09,900 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [968956090] [2023-11-12 01:01:09,900 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 01:01:09,901 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 01:01:09,901 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ce818b8-874c-443f-8de7-54cce8ad57bb/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 01:01:09,905 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ce818b8-874c-443f-8de7-54cce8ad57bb/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 01:01:09,932 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ce818b8-874c-443f-8de7-54cce8ad57bb/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-11-12 01:01:10,175 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 01:01:10,180 INFO L262 TraceCheckSpWp]: Trace formula consists of 988 conjuncts, 2 conjunts are in the unsatisfiable core [2023-11-12 01:01:10,185 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 01:01:10,229 INFO L134 CoverageAnalysis]: Checked inductivity of 76 backedges. 28 proven. 0 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2023-11-12 01:01:10,229 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-12 01:01:10,229 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [968956090] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 01:01:10,230 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-12 01:01:10,230 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2023-11-12 01:01:10,230 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [551538762] [2023-11-12 01:01:10,230 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 01:01:10,231 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-12 01:01:10,231 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 01:01:10,232 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-12 01:01:10,232 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-11-12 01:01:10,232 INFO L87 Difference]: Start difference. First operand 88842 states and 129549 transitions. Second operand has 3 states, 3 states have (on average 32.333333333333336) internal successors, (97), 3 states have internal predecessors, (97), 3 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2023-11-12 01:01:13,839 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 01:01:13,839 INFO L93 Difference]: Finished difference Result 159118 states and 235408 transitions. [2023-11-12 01:01:13,839 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-12 01:01:13,839 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 32.333333333333336) internal successors, (97), 3 states have internal predecessors, (97), 3 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) Word has length 160 [2023-11-12 01:01:13,840 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 01:01:14,366 INFO L225 Difference]: With dead ends: 159118 [2023-11-12 01:01:14,366 INFO L226 Difference]: Without dead ends: 113802 [2023-11-12 01:01:14,471 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 167 GetRequests, 162 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 01:01:14,472 INFO L413 NwaCegarLoop]: 399 mSDtfsCounter, 138 mSDsluCounter, 267 mSDsCounter, 0 mSdLazyCounter, 128 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 138 SdHoareTripleChecker+Valid, 666 SdHoareTripleChecker+Invalid, 128 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 128 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-12 01:01:14,474 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [138 Valid, 666 Invalid, 128 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 128 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-12 01:01:14,578 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113802 states.