./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/systemc/token_ring.11.cil-2.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version e7bb482b 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_f4b1f3db-46df-4fde-a80f-481a85c52b9e/bin/utaipan-verify-FOvIYxoinp/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4b1f3db-46df-4fde-a80f-481a85c52b9e/bin/utaipan-verify-FOvIYxoinp/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4b1f3db-46df-4fde-a80f-481a85c52b9e/bin/utaipan-verify-FOvIYxoinp/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4b1f3db-46df-4fde-a80f-481a85c52b9e/bin/utaipan-verify-FOvIYxoinp/config/TaipanReach.xml -i ../../sv-benchmarks/c/systemc/token_ring.11.cil-2.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4b1f3db-46df-4fde-a80f-481a85c52b9e/bin/utaipan-verify-FOvIYxoinp/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4b1f3db-46df-4fde-a80f-481a85c52b9e/bin/utaipan-verify-FOvIYxoinp --witnessprinter.witness.filename witness.graphml --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 c5f603027c62ff37561a520351662dbe2fd253b52e04e36028cb9a624978ef8e --- Real Ultimate output --- This is Ultimate 0.2.3-dev-e7bb482 [2023-11-06 20:33:13,952 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-06 20:33:14,026 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4b1f3db-46df-4fde-a80f-481a85c52b9e/bin/utaipan-verify-FOvIYxoinp/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-11-06 20:33:14,032 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-06 20:33:14,033 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-06 20:33:14,087 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-06 20:33:14,088 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-06 20:33:14,089 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-06 20:33:14,090 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-06 20:33:14,092 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-06 20:33:14,092 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-06 20:33:14,094 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-06 20:33:14,095 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-06 20:33:14,098 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-06 20:33:14,098 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-06 20:33:14,099 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-06 20:33:14,101 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-06 20:33:14,103 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-06 20:33:14,108 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-06 20:33:14,108 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-06 20:33:14,109 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-06 20:33:14,110 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-06 20:33:14,111 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-06 20:33:14,111 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-11-06 20:33:14,112 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-06 20:33:14,112 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-06 20:33:14,113 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-06 20:33:14,113 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-06 20:33:14,114 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-11-06 20:33:14,114 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-06 20:33:14,115 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-11-06 20:33:14,115 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-06 20:33:14,116 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-11-06 20:33:14,116 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-06 20:33:14,117 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-06 20:33:14,117 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-06 20:33:14,118 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-06 20:33:14,118 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-06 20:33:14,119 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-06 20:33:14,119 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2023-11-06 20:33:14,120 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-06 20:33:14,123 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-06 20:33:14,123 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-11-06 20:33:14,124 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-06 20:33:14,134 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-06 20:33:14,136 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_f4b1f3db-46df-4fde-a80f-481a85c52b9e/bin/utaipan-verify-FOvIYxoinp/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4b1f3db-46df-4fde-a80f-481a85c52b9e/bin/utaipan-verify-FOvIYxoinp Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> c5f603027c62ff37561a520351662dbe2fd253b52e04e36028cb9a624978ef8e [2023-11-06 20:33:14,525 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-06 20:33:14,560 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-06 20:33:14,565 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-06 20:33:14,567 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-06 20:33:14,568 INFO L274 PluginConnector]: CDTParser initialized [2023-11-06 20:33:14,571 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4b1f3db-46df-4fde-a80f-481a85c52b9e/bin/utaipan-verify-FOvIYxoinp/../../sv-benchmarks/c/systemc/token_ring.11.cil-2.c [2023-11-06 20:33:17,938 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-06 20:33:18,182 INFO L384 CDTParser]: Found 1 translation units. [2023-11-06 20:33:18,183 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4b1f3db-46df-4fde-a80f-481a85c52b9e/sv-benchmarks/c/systemc/token_ring.11.cil-2.c [2023-11-06 20:33:18,203 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4b1f3db-46df-4fde-a80f-481a85c52b9e/bin/utaipan-verify-FOvIYxoinp/data/625e3637b/5ffa6d3a3b584fcf86ffd158eab041af/FLAG15600557e [2023-11-06 20:33:18,219 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4b1f3db-46df-4fde-a80f-481a85c52b9e/bin/utaipan-verify-FOvIYxoinp/data/625e3637b/5ffa6d3a3b584fcf86ffd158eab041af [2023-11-06 20:33:18,222 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-06 20:33:18,223 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-06 20:33:18,225 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-06 20:33:18,225 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-06 20:33:18,234 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-06 20:33:18,236 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.11 08:33:18" (1/1) ... [2023-11-06 20:33:18,238 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6b69b7cb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:33:18, skipping insertion in model container [2023-11-06 20:33:18,239 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.11 08:33:18" (1/1) ... [2023-11-06 20:33:18,305 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-06 20:33:18,466 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_f4b1f3db-46df-4fde-a80f-481a85c52b9e/sv-benchmarks/c/systemc/token_ring.11.cil-2.c[671,684] [2023-11-06 20:33:18,645 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-06 20:33:18,664 INFO L202 MainTranslator]: Completed pre-run [2023-11-06 20:33:18,676 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_f4b1f3db-46df-4fde-a80f-481a85c52b9e/sv-benchmarks/c/systemc/token_ring.11.cil-2.c[671,684] [2023-11-06 20:33:18,776 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-06 20:33:18,824 INFO L206 MainTranslator]: Completed translation [2023-11-06 20:33:18,825 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:33:18 WrapperNode [2023-11-06 20:33:18,825 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-06 20:33:18,827 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-06 20:33:18,827 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-06 20:33:18,828 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-06 20:33:18,837 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:33:18" (1/1) ... [2023-11-06 20:33:18,871 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:33:18" (1/1) ... [2023-11-06 20:33:18,935 INFO L138 Inliner]: procedures = 50, calls = 64, calls flagged for inlining = 34, calls inlined = 34, statements flattened = 819 [2023-11-06 20:33:18,936 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-06 20:33:18,936 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-06 20:33:18,937 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-06 20:33:18,937 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-06 20:33:18,949 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:33:18" (1/1) ... [2023-11-06 20:33:18,950 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:33:18" (1/1) ... [2023-11-06 20:33:18,956 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:33:18" (1/1) ... [2023-11-06 20:33:18,956 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:33:18" (1/1) ... [2023-11-06 20:33:18,976 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:33:18" (1/1) ... [2023-11-06 20:33:18,993 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:33:18" (1/1) ... [2023-11-06 20:33:18,997 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:33:18" (1/1) ... [2023-11-06 20:33:19,002 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:33:18" (1/1) ... [2023-11-06 20:33:19,010 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-06 20:33:19,011 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-06 20:33:19,012 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-06 20:33:19,012 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-06 20:33:19,013 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:33:18" (1/1) ... [2023-11-06 20:33:19,026 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-06 20:33:19,044 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4b1f3db-46df-4fde-a80f-481a85c52b9e/bin/utaipan-verify-FOvIYxoinp/z3 [2023-11-06 20:33:19,061 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4b1f3db-46df-4fde-a80f-481a85c52b9e/bin/utaipan-verify-FOvIYxoinp/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-06 20:33:19,124 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4b1f3db-46df-4fde-a80f-481a85c52b9e/bin/utaipan-verify-FOvIYxoinp/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-06 20:33:19,170 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-06 20:33:19,171 INFO L130 BoogieDeclarations]: Found specification of procedure activate_threads [2023-11-06 20:33:19,171 INFO L138 BoogieDeclarations]: Found implementation of procedure activate_threads [2023-11-06 20:33:19,171 INFO L130 BoogieDeclarations]: Found specification of procedure immediate_notify [2023-11-06 20:33:19,171 INFO L138 BoogieDeclarations]: Found implementation of procedure immediate_notify [2023-11-06 20:33:19,172 INFO L130 BoogieDeclarations]: Found specification of procedure update_channels [2023-11-06 20:33:19,174 INFO L138 BoogieDeclarations]: Found implementation of procedure update_channels [2023-11-06 20:33:19,175 INFO L130 BoogieDeclarations]: Found specification of procedure fire_delta_events [2023-11-06 20:33:19,176 INFO L138 BoogieDeclarations]: Found implementation of procedure fire_delta_events [2023-11-06 20:33:19,176 INFO L130 BoogieDeclarations]: Found specification of procedure exists_runnable_thread [2023-11-06 20:33:19,176 INFO L138 BoogieDeclarations]: Found implementation of procedure exists_runnable_thread [2023-11-06 20:33:19,176 INFO L130 BoogieDeclarations]: Found specification of procedure reset_delta_events [2023-11-06 20:33:19,176 INFO L138 BoogieDeclarations]: Found implementation of procedure reset_delta_events [2023-11-06 20:33:19,177 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-06 20:33:19,177 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-06 20:33:19,177 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-06 20:33:19,413 INFO L236 CfgBuilder]: Building ICFG [2023-11-06 20:33:19,417 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-06 20:33:20,595 INFO L277 CfgBuilder]: Performing block encoding [2023-11-06 20:33:21,277 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-06 20:33:21,277 INFO L302 CfgBuilder]: Removed 14 assume(true) statements. [2023-11-06 20:33:21,282 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.11 08:33:21 BoogieIcfgContainer [2023-11-06 20:33:21,282 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-06 20:33:21,286 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-06 20:33:21,287 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-06 20:33:21,291 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-06 20:33:21,292 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.11 08:33:18" (1/3) ... [2023-11-06 20:33:21,293 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@26ca57e1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.11 08:33:21, skipping insertion in model container [2023-11-06 20:33:21,294 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:33:18" (2/3) ... [2023-11-06 20:33:21,296 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@26ca57e1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.11 08:33:21, skipping insertion in model container [2023-11-06 20:33:21,296 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.11 08:33:21" (3/3) ... [2023-11-06 20:33:21,298 INFO L112 eAbstractionObserver]: Analyzing ICFG token_ring.11.cil-2.c [2023-11-06 20:33:21,320 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-06 20:33:21,320 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-11-06 20:33:21,400 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-06 20:33:21,407 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=LoopsAndPotentialCycles, 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;@1b2387c4, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-06 20:33:21,408 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-11-06 20:33:21,414 INFO L276 IsEmpty]: Start isEmpty. Operand has 189 states, 156 states have (on average 1.5128205128205128) internal successors, (236), 158 states have internal predecessors, (236), 25 states have call successors, (25), 6 states have call predecessors, (25), 6 states have return successors, (25), 25 states have call predecessors, (25), 25 states have call successors, (25) [2023-11-06 20:33:21,428 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2023-11-06 20:33:21,428 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 20:33:21,429 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] [2023-11-06 20:33:21,430 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-06 20:33:21,438 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 20:33:21,438 INFO L85 PathProgramCache]: Analyzing trace with hash -1890282970, now seen corresponding path program 1 times [2023-11-06 20:33:21,448 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 20:33:21,449 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [174230676] [2023-11-06 20:33:21,449 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:33:21,449 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 20:33:21,617 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:33:22,016 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-06 20:33:22,017 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 20:33:22,017 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [174230676] [2023-11-06 20:33:22,018 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [174230676] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-06 20:33:22,018 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-06 20:33:22,018 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-11-06 20:33:22,020 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [885486762] [2023-11-06 20:33:22,021 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-06 20:33:22,028 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-06 20:33:22,028 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 20:33:22,070 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-06 20:33:22,071 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-06 20:33:22,076 INFO L87 Difference]: Start difference. First operand has 189 states, 156 states have (on average 1.5128205128205128) internal successors, (236), 158 states have internal predecessors, (236), 25 states have call successors, (25), 6 states have call predecessors, (25), 6 states have return successors, (25), 25 states have call predecessors, (25), 25 states have call successors, (25) Second operand has 4 states, 4 states have (on average 13.25) internal successors, (53), 4 states have internal predecessors, (53), 2 states have call successors, (5), 1 states have call predecessors, (5), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2023-11-06 20:33:22,691 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 20:33:22,691 INFO L93 Difference]: Finished difference Result 551 states and 849 transitions. [2023-11-06 20:33:22,693 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-06 20:33:22,694 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 13.25) internal successors, (53), 4 states have internal predecessors, (53), 2 states have call successors, (5), 1 states have call predecessors, (5), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) Word has length 63 [2023-11-06 20:33:22,694 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 20:33:22,708 INFO L225 Difference]: With dead ends: 551 [2023-11-06 20:33:22,708 INFO L226 Difference]: Without dead ends: 363 [2023-11-06 20:33:22,715 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 [2023-11-06 20:33:22,718 INFO L413 NwaCegarLoop]: 448 mSDtfsCounter, 503 mSDsluCounter, 354 mSDsCounter, 0 mSdLazyCounter, 288 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 503 SdHoareTripleChecker+Valid, 802 SdHoareTripleChecker+Invalid, 299 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 288 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-11-06 20:33:22,719 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [503 Valid, 802 Invalid, 299 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 288 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-11-06 20:33:22,770 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 363 states. [2023-11-06 20:33:22,825 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 363 to 362. [2023-11-06 20:33:22,828 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 362 states, 303 states have (on average 1.4785478547854785) internal successors, (448), 305 states have internal predecessors, (448), 46 states have call successors, (46), 12 states have call predecessors, (46), 12 states have return successors, (46), 45 states have call predecessors, (46), 46 states have call successors, (46) [2023-11-06 20:33:22,832 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 362 states to 362 states and 540 transitions. [2023-11-06 20:33:22,833 INFO L78 Accepts]: Start accepts. Automaton has 362 states and 540 transitions. Word has length 63 [2023-11-06 20:33:22,834 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 20:33:22,834 INFO L495 AbstractCegarLoop]: Abstraction has 362 states and 540 transitions. [2023-11-06 20:33:22,835 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 13.25) internal successors, (53), 4 states have internal predecessors, (53), 2 states have call successors, (5), 1 states have call predecessors, (5), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2023-11-06 20:33:22,835 INFO L276 IsEmpty]: Start isEmpty. Operand 362 states and 540 transitions. [2023-11-06 20:33:22,845 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2023-11-06 20:33:22,846 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 20:33:22,846 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 20:33:22,846 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-06 20:33:22,847 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-06 20:33:22,847 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 20:33:22,848 INFO L85 PathProgramCache]: Analyzing trace with hash 727241580, now seen corresponding path program 1 times [2023-11-06 20:33:22,848 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 20:33:22,848 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1304799985] [2023-11-06 20:33:22,848 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:33:22,849 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 20:33:22,894 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:33:23,230 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2023-11-06 20:33:23,230 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 20:33:23,231 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1304799985] [2023-11-06 20:33:23,231 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1304799985] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-06 20:33:23,231 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [953435689] [2023-11-06 20:33:23,231 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:33:23,232 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 20:33:23,232 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4b1f3db-46df-4fde-a80f-481a85c52b9e/bin/utaipan-verify-FOvIYxoinp/z3 [2023-11-06 20:33:23,236 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4b1f3db-46df-4fde-a80f-481a85c52b9e/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-06 20:33:23,260 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4b1f3db-46df-4fde-a80f-481a85c52b9e/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-06 20:33:23,542 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:33:23,549 INFO L262 TraceCheckSpWp]: Trace formula consists of 913 conjuncts, 2 conjunts are in the unsatisfiable core [2023-11-06 20:33:23,561 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-06 20:33:23,660 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 29 proven. 0 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2023-11-06 20:33:23,663 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-06 20:33:23,665 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [953435689] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-06 20:33:23,665 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-06 20:33:23,666 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [4] total 5 [2023-11-06 20:33:23,667 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1130459238] [2023-11-06 20:33:23,668 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-06 20:33:23,669 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-06 20:33:23,670 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 20:33:23,671 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-06 20:33:23,672 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-11-06 20:33:23,673 INFO L87 Difference]: Start difference. First operand 362 states and 540 transitions. Second operand has 3 states, 3 states have (on average 33.0) internal successors, (99), 2 states have internal predecessors, (99), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-11-06 20:33:23,890 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 20:33:23,890 INFO L93 Difference]: Finished difference Result 1069 states and 1621 transitions. [2023-11-06 20:33:23,891 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-06 20:33:23,891 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 33.0) internal successors, (99), 2 states have internal predecessors, (99), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 129 [2023-11-06 20:33:23,892 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 20:33:23,926 INFO L225 Difference]: With dead ends: 1069 [2023-11-06 20:33:23,927 INFO L226 Difference]: Without dead ends: 712 [2023-11-06 20:33:23,929 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 132 GetRequests, 129 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-11-06 20:33:23,930 INFO L413 NwaCegarLoop]: 282 mSDtfsCounter, 235 mSDsluCounter, 223 mSDsCounter, 0 mSdLazyCounter, 97 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 235 SdHoareTripleChecker+Valid, 505 SdHoareTripleChecker+Invalid, 99 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 97 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-06 20:33:23,931 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [235 Valid, 505 Invalid, 99 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 97 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-06 20:33:23,933 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 712 states. [2023-11-06 20:33:23,989 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 712 to 708. [2023-11-06 20:33:23,992 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 708 states, 597 states have (on average 1.4757118927973198) internal successors, (881), 600 states have internal predecessors, (881), 86 states have call successors, (86), 24 states have call predecessors, (86), 24 states have return successors, (86), 84 states have call predecessors, (86), 86 states have call successors, (86) [2023-11-06 20:33:23,998 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 708 states to 708 states and 1053 transitions. [2023-11-06 20:33:23,999 INFO L78 Accepts]: Start accepts. Automaton has 708 states and 1053 transitions. Word has length 129 [2023-11-06 20:33:23,999 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 20:33:23,999 INFO L495 AbstractCegarLoop]: Abstraction has 708 states and 1053 transitions. [2023-11-06 20:33:24,000 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 33.0) internal successors, (99), 2 states have internal predecessors, (99), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-11-06 20:33:24,000 INFO L276 IsEmpty]: Start isEmpty. Operand 708 states and 1053 transitions. [2023-11-06 20:33:24,005 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2023-11-06 20:33:24,005 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 20:33:24,006 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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] [2023-11-06 20:33:24,017 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4b1f3db-46df-4fde-a80f-481a85c52b9e/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-11-06 20:33:24,214 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4b1f3db-46df-4fde-a80f-481a85c52b9e/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2023-11-06 20:33:24,214 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-06 20:33:24,215 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 20:33:24,215 INFO L85 PathProgramCache]: Analyzing trace with hash -375967510, now seen corresponding path program 1 times [2023-11-06 20:33:24,215 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 20:33:24,216 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1878400595] [2023-11-06 20:33:24,216 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:33:24,216 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 20:33:24,253 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:33:24,436 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2023-11-06 20:33:24,436 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 20:33:24,437 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1878400595] [2023-11-06 20:33:24,437 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1878400595] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-06 20:33:24,437 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2084116368] [2023-11-06 20:33:24,437 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:33:24,438 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 20:33:24,438 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4b1f3db-46df-4fde-a80f-481a85c52b9e/bin/utaipan-verify-FOvIYxoinp/z3 [2023-11-06 20:33:24,444 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4b1f3db-46df-4fde-a80f-481a85c52b9e/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-06 20:33:24,449 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4b1f3db-46df-4fde-a80f-481a85c52b9e/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-06 20:33:24,688 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:33:24,693 INFO L262 TraceCheckSpWp]: Trace formula consists of 907 conjuncts, 2 conjunts are in the unsatisfiable core [2023-11-06 20:33:24,699 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-06 20:33:24,739 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2023-11-06 20:33:24,739 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-06 20:33:24,740 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2084116368] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-06 20:33:24,740 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-06 20:33:24,740 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [4] total 5 [2023-11-06 20:33:24,740 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [855905620] [2023-11-06 20:33:24,741 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-06 20:33:24,741 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-06 20:33:24,741 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 20:33:24,742 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-06 20:33:24,742 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-11-06 20:33:24,743 INFO L87 Difference]: Start difference. First operand 708 states and 1053 transitions. Second operand has 3 states, 3 states have (on average 27.0) internal successors, (81), 2 states have internal predecessors, (81), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-11-06 20:33:24,966 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 20:33:24,966 INFO L93 Difference]: Finished difference Result 2101 states and 3176 transitions. [2023-11-06 20:33:24,967 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-06 20:33:24,967 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 27.0) internal successors, (81), 2 states have internal predecessors, (81), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 129 [2023-11-06 20:33:24,968 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 20:33:24,978 INFO L225 Difference]: With dead ends: 2101 [2023-11-06 20:33:24,978 INFO L226 Difference]: Without dead ends: 1398 [2023-11-06 20:33:24,981 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 132 GetRequests, 129 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-11-06 20:33:24,983 INFO L413 NwaCegarLoop]: 280 mSDtfsCounter, 253 mSDsluCounter, 223 mSDsCounter, 0 mSdLazyCounter, 97 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 253 SdHoareTripleChecker+Valid, 503 SdHoareTripleChecker+Invalid, 99 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 97 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-06 20:33:24,984 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [253 Valid, 503 Invalid, 99 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 97 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-06 20:33:24,986 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1398 states. [2023-11-06 20:33:25,070 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1398 to 1392. [2023-11-06 20:33:25,073 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1392 states, 1179 states have (on average 1.4715860899067006) internal successors, (1735), 1184 states have internal predecessors, (1735), 164 states have call successors, (164), 48 states have call predecessors, (164), 48 states have return successors, (164), 160 states have call predecessors, (164), 164 states have call successors, (164) [2023-11-06 20:33:25,085 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1392 states to 1392 states and 2063 transitions. [2023-11-06 20:33:25,086 INFO L78 Accepts]: Start accepts. Automaton has 1392 states and 2063 transitions. Word has length 129 [2023-11-06 20:33:25,086 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 20:33:25,087 INFO L495 AbstractCegarLoop]: Abstraction has 1392 states and 2063 transitions. [2023-11-06 20:33:25,087 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 27.0) internal successors, (81), 2 states have internal predecessors, (81), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-11-06 20:33:25,087 INFO L276 IsEmpty]: Start isEmpty. Operand 1392 states and 2063 transitions. [2023-11-06 20:33:25,093 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2023-11-06 20:33:25,094 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 20:33:25,094 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 20:33:25,104 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4b1f3db-46df-4fde-a80f-481a85c52b9e/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-11-06 20:33:25,301 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4b1f3db-46df-4fde-a80f-481a85c52b9e/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 20:33:25,302 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-06 20:33:25,302 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 20:33:25,302 INFO L85 PathProgramCache]: Analyzing trace with hash -206279960, now seen corresponding path program 1 times [2023-11-06 20:33:25,302 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 20:33:25,302 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1056290407] [2023-11-06 20:33:25,303 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:33:25,303 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 20:33:25,334 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:33:25,471 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2023-11-06 20:33:25,472 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 20:33:25,473 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1056290407] [2023-11-06 20:33:25,474 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1056290407] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-06 20:33:25,474 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1556459254] [2023-11-06 20:33:25,474 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:33:25,474 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 20:33:25,475 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4b1f3db-46df-4fde-a80f-481a85c52b9e/bin/utaipan-verify-FOvIYxoinp/z3 [2023-11-06 20:33:25,481 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4b1f3db-46df-4fde-a80f-481a85c52b9e/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-06 20:33:25,504 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4b1f3db-46df-4fde-a80f-481a85c52b9e/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-06 20:33:25,730 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:33:25,735 INFO L262 TraceCheckSpWp]: Trace formula consists of 901 conjuncts, 2 conjunts are in the unsatisfiable core [2023-11-06 20:33:25,741 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-06 20:33:25,856 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 39 trivial. 0 not checked. [2023-11-06 20:33:25,856 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-06 20:33:25,857 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1556459254] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-06 20:33:25,857 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-06 20:33:25,857 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [4] total 5 [2023-11-06 20:33:25,857 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2771072] [2023-11-06 20:33:25,858 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-06 20:33:25,858 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-06 20:33:25,859 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 20:33:25,859 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-06 20:33:25,860 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2023-11-06 20:33:25,860 INFO L87 Difference]: Start difference. First operand 1392 states and 2063 transitions. Second operand has 3 states, 3 states have (on average 26.0) internal successors, (78), 2 states have internal predecessors, (78), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-11-06 20:33:26,169 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 20:33:26,170 INFO L93 Difference]: Finished difference Result 4141 states and 6236 transitions. [2023-11-06 20:33:26,171 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-06 20:33:26,171 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 26.0) internal successors, (78), 2 states have internal predecessors, (78), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 129 [2023-11-06 20:33:26,171 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 20:33:26,196 INFO L225 Difference]: With dead ends: 4141 [2023-11-06 20:33:26,196 INFO L226 Difference]: Without dead ends: 2754 [2023-11-06 20:33:26,206 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 132 GetRequests, 129 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2023-11-06 20:33:26,209 INFO L413 NwaCegarLoop]: 232 mSDtfsCounter, 256 mSDsluCounter, 223 mSDsCounter, 0 mSdLazyCounter, 94 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 256 SdHoareTripleChecker+Valid, 455 SdHoareTripleChecker+Invalid, 96 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 94 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-06 20:33:26,214 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [256 Valid, 455 Invalid, 96 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 94 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-06 20:33:26,221 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2754 states. [2023-11-06 20:33:26,471 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2754 to 2744. [2023-11-06 20:33:26,478 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2744 states, 2331 states have (on average 1.4667524667524667) internal successors, (3419), 2340 states have internal predecessors, (3419), 316 states have call successors, (316), 96 states have call predecessors, (316), 96 states have return successors, (316), 308 states have call predecessors, (316), 316 states have call successors, (316) [2023-11-06 20:33:26,510 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2744 states to 2744 states and 4051 transitions. [2023-11-06 20:33:26,511 INFO L78 Accepts]: Start accepts. Automaton has 2744 states and 4051 transitions. Word has length 129 [2023-11-06 20:33:26,511 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 20:33:26,511 INFO L495 AbstractCegarLoop]: Abstraction has 2744 states and 4051 transitions. [2023-11-06 20:33:26,512 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 26.0) internal successors, (78), 2 states have internal predecessors, (78), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-11-06 20:33:26,512 INFO L276 IsEmpty]: Start isEmpty. Operand 2744 states and 4051 transitions. [2023-11-06 20:33:26,524 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2023-11-06 20:33:26,524 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 20:33:26,525 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 20:33:26,540 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4b1f3db-46df-4fde-a80f-481a85c52b9e/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-11-06 20:33:26,736 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4b1f3db-46df-4fde-a80f-481a85c52b9e/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 20:33:26,737 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-06 20:33:26,737 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 20:33:26,738 INFO L85 PathProgramCache]: Analyzing trace with hash -220985302, now seen corresponding path program 1 times [2023-11-06 20:33:26,738 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 20:33:26,738 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [134131641] [2023-11-06 20:33:26,738 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:33:26,738 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 20:33:26,783 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:33:26,956 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2023-11-06 20:33:26,957 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 20:33:26,957 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [134131641] [2023-11-06 20:33:26,957 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [134131641] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-06 20:33:26,958 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [804453104] [2023-11-06 20:33:26,958 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:33:26,958 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 20:33:26,958 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4b1f3db-46df-4fde-a80f-481a85c52b9e/bin/utaipan-verify-FOvIYxoinp/z3 [2023-11-06 20:33:26,960 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4b1f3db-46df-4fde-a80f-481a85c52b9e/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-06 20:33:26,978 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4b1f3db-46df-4fde-a80f-481a85c52b9e/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-11-06 20:33:27,213 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:33:27,220 INFO L262 TraceCheckSpWp]: Trace formula consists of 895 conjuncts, 2 conjunts are in the unsatisfiable core [2023-11-06 20:33:27,225 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-06 20:33:27,290 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 17 proven. 0 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2023-11-06 20:33:27,290 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-06 20:33:27,291 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [804453104] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-06 20:33:27,291 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-06 20:33:27,293 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2023-11-06 20:33:27,293 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [345698992] [2023-11-06 20:33:27,293 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-06 20:33:27,302 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-06 20:33:27,302 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 20:33:27,303 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-06 20:33:27,304 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-06 20:33:27,304 INFO L87 Difference]: Start difference. First operand 2744 states and 4051 transitions. Second operand has 3 states, 3 states have (on average 29.0) internal successors, (87), 2 states have internal predecessors, (87), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-11-06 20:33:27,789 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 20:33:27,791 INFO L93 Difference]: Finished difference Result 8173 states and 12256 transitions. [2023-11-06 20:33:27,791 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-06 20:33:27,791 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 29.0) internal successors, (87), 2 states have internal predecessors, (87), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 129 [2023-11-06 20:33:27,792 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 20:33:27,830 INFO L225 Difference]: With dead ends: 8173 [2023-11-06 20:33:27,831 INFO L226 Difference]: Without dead ends: 5434 [2023-11-06 20:33:27,843 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 133 GetRequests, 129 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-06 20:33:27,846 INFO L413 NwaCegarLoop]: 232 mSDtfsCounter, 247 mSDsluCounter, 223 mSDsCounter, 0 mSdLazyCounter, 94 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 247 SdHoareTripleChecker+Valid, 455 SdHoareTripleChecker+Invalid, 96 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 94 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-06 20:33:27,846 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [247 Valid, 455 Invalid, 96 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [2 Valid, 94 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-06 20:33:27,854 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5434 states. [2023-11-06 20:33:28,230 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5434 to 5416. [2023-11-06 20:33:28,242 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5416 states, 4611 states have (on average 1.4615050965083496) internal successors, (6739), 4628 states have internal predecessors, (6739), 612 states have call successors, (612), 192 states have call predecessors, (612), 192 states have return successors, (612), 596 states have call predecessors, (612), 612 states have call successors, (612) [2023-11-06 20:33:28,274 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5416 states to 5416 states and 7963 transitions. [2023-11-06 20:33:28,275 INFO L78 Accepts]: Start accepts. Automaton has 5416 states and 7963 transitions. Word has length 129 [2023-11-06 20:33:28,275 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 20:33:28,275 INFO L495 AbstractCegarLoop]: Abstraction has 5416 states and 7963 transitions. [2023-11-06 20:33:28,276 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 29.0) internal successors, (87), 2 states have internal predecessors, (87), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-11-06 20:33:28,276 INFO L276 IsEmpty]: Start isEmpty. Operand 5416 states and 7963 transitions. [2023-11-06 20:33:28,290 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2023-11-06 20:33:28,291 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 20:33:28,291 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 20:33:28,300 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4b1f3db-46df-4fde-a80f-481a85c52b9e/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2023-11-06 20:33:28,497 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4b1f3db-46df-4fde-a80f-481a85c52b9e/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 20:33:28,498 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-06 20:33:28,498 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 20:33:28,498 INFO L85 PathProgramCache]: Analyzing trace with hash 1105991848, now seen corresponding path program 1 times [2023-11-06 20:33:28,498 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 20:33:28,498 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [147391770] [2023-11-06 20:33:28,499 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:33:28,499 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 20:33:28,533 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:33:28,623 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2023-11-06 20:33:28,624 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 20:33:28,624 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [147391770] [2023-11-06 20:33:28,624 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [147391770] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-06 20:33:28,624 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [877235747] [2023-11-06 20:33:28,624 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:33:28,625 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 20:33:28,625 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4b1f3db-46df-4fde-a80f-481a85c52b9e/bin/utaipan-verify-FOvIYxoinp/z3 [2023-11-06 20:33:28,626 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4b1f3db-46df-4fde-a80f-481a85c52b9e/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-06 20:33:28,680 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4b1f3db-46df-4fde-a80f-481a85c52b9e/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-11-06 20:33:28,899 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:33:28,904 INFO L262 TraceCheckSpWp]: Trace formula consists of 889 conjuncts, 2 conjunts are in the unsatisfiable core [2023-11-06 20:33:28,908 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-06 20:33:28,975 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 35 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-11-06 20:33:28,975 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-06 20:33:28,975 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [877235747] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-06 20:33:28,975 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-06 20:33:28,976 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [4] total 5 [2023-11-06 20:33:28,976 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1652660109] [2023-11-06 20:33:28,976 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-06 20:33:28,976 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-06 20:33:28,977 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 20:33:28,977 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-06 20:33:28,977 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-11-06 20:33:28,978 INFO L87 Difference]: Start difference. First operand 5416 states and 7963 transitions. Second operand has 3 states, 3 states have (on average 35.0) internal successors, (105), 2 states have internal predecessors, (105), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-11-06 20:33:29,673 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 20:33:29,673 INFO L93 Difference]: Finished difference Result 16141 states and 24096 transitions. [2023-11-06 20:33:29,674 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-06 20:33:29,674 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 35.0) internal successors, (105), 2 states have internal predecessors, (105), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 129 [2023-11-06 20:33:29,674 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 20:33:29,749 INFO L225 Difference]: With dead ends: 16141 [2023-11-06 20:33:29,749 INFO L226 Difference]: Without dead ends: 10730 [2023-11-06 20:33:29,770 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 132 GetRequests, 129 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-11-06 20:33:29,771 INFO L413 NwaCegarLoop]: 232 mSDtfsCounter, 229 mSDsluCounter, 223 mSDsCounter, 0 mSdLazyCounter, 94 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 229 SdHoareTripleChecker+Valid, 455 SdHoareTripleChecker+Invalid, 96 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 94 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-06 20:33:29,771 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [229 Valid, 455 Invalid, 96 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 94 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-06 20:33:29,786 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10730 states. [2023-11-06 20:33:30,459 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10730 to 10696. [2023-11-06 20:33:30,499 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 10696 states, 9123 states have (on average 1.4559903540502028) internal successors, (13283), 9156 states have internal predecessors, (13283), 1188 states have call successors, (1188), 384 states have call predecessors, (1188), 384 states have return successors, (1188), 1156 states have call predecessors, (1188), 1188 states have call successors, (1188) [2023-11-06 20:33:30,616 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10696 states to 10696 states and 15659 transitions. [2023-11-06 20:33:30,618 INFO L78 Accepts]: Start accepts. Automaton has 10696 states and 15659 transitions. Word has length 129 [2023-11-06 20:33:30,620 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 20:33:30,620 INFO L495 AbstractCegarLoop]: Abstraction has 10696 states and 15659 transitions. [2023-11-06 20:33:30,621 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 35.0) internal successors, (105), 2 states have internal predecessors, (105), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-11-06 20:33:30,621 INFO L276 IsEmpty]: Start isEmpty. Operand 10696 states and 15659 transitions. [2023-11-06 20:33:30,644 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2023-11-06 20:33:30,645 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 20:33:30,645 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 20:33:30,652 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4b1f3db-46df-4fde-a80f-481a85c52b9e/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-11-06 20:33:30,852 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4b1f3db-46df-4fde-a80f-481a85c52b9e/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2023-11-06 20:33:30,852 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-06 20:33:30,852 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 20:33:30,852 INFO L85 PathProgramCache]: Analyzing trace with hash -1348080474, now seen corresponding path program 1 times [2023-11-06 20:33:30,853 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 20:33:30,853 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1231046867] [2023-11-06 20:33:30,853 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:33:30,853 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 20:33:30,896 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:33:31,052 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2023-11-06 20:33:31,053 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 20:33:31,053 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1231046867] [2023-11-06 20:33:31,053 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1231046867] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-06 20:33:31,053 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [271524473] [2023-11-06 20:33:31,054 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:33:31,054 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 20:33:31,054 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4b1f3db-46df-4fde-a80f-481a85c52b9e/bin/utaipan-verify-FOvIYxoinp/z3 [2023-11-06 20:33:31,055 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4b1f3db-46df-4fde-a80f-481a85c52b9e/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-06 20:33:31,081 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4b1f3db-46df-4fde-a80f-481a85c52b9e/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-11-06 20:33:31,341 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:33:31,347 INFO L262 TraceCheckSpWp]: Trace formula consists of 883 conjuncts, 2 conjunts are in the unsatisfiable core [2023-11-06 20:33:31,351 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-06 20:33:31,410 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 23 proven. 0 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2023-11-06 20:33:31,411 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-06 20:33:31,411 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [271524473] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-06 20:33:31,411 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-06 20:33:31,411 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [4] total 4 [2023-11-06 20:33:31,412 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1078909499] [2023-11-06 20:33:31,412 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-06 20:33:31,412 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-06 20:33:31,413 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 20:33:31,413 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-06 20:33:31,414 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-06 20:33:31,414 INFO L87 Difference]: Start difference. First operand 10696 states and 15659 transitions. Second operand has 3 states, 3 states have (on average 31.0) internal successors, (93), 2 states have internal predecessors, (93), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-11-06 20:33:32,773 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 20:33:32,773 INFO L93 Difference]: Finished difference Result 31885 states and 47376 transitions. [2023-11-06 20:33:32,774 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-06 20:33:32,774 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 31.0) internal successors, (93), 2 states have internal predecessors, (93), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 129 [2023-11-06 20:33:32,774 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 20:33:32,911 INFO L225 Difference]: With dead ends: 31885 [2023-11-06 20:33:32,911 INFO L226 Difference]: Without dead ends: 21194 [2023-11-06 20:33:32,965 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 132 GetRequests, 130 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-06 20:33:32,968 INFO L413 NwaCegarLoop]: 232 mSDtfsCounter, 241 mSDsluCounter, 223 mSDsCounter, 0 mSdLazyCounter, 94 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 241 SdHoareTripleChecker+Valid, 455 SdHoareTripleChecker+Invalid, 96 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 94 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-11-06 20:33:32,968 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [241 Valid, 455 Invalid, 96 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 94 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-11-06 20:33:32,999 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21194 states. [2023-11-06 20:33:34,294 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21194 to 21128. [2023-11-06 20:33:34,324 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21128 states, 18051 states have (on average 1.4502797628940225) internal successors, (26179), 18116 states have internal predecessors, (26179), 2308 states have call successors, (2308), 768 states have call predecessors, (2308), 768 states have return successors, (2308), 2244 states have call predecessors, (2308), 2308 states have call successors, (2308) [2023-11-06 20:33:34,403 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21128 states to 21128 states and 30795 transitions. [2023-11-06 20:33:34,406 INFO L78 Accepts]: Start accepts. Automaton has 21128 states and 30795 transitions. Word has length 129 [2023-11-06 20:33:34,406 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 20:33:34,406 INFO L495 AbstractCegarLoop]: Abstraction has 21128 states and 30795 transitions. [2023-11-06 20:33:34,407 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 31.0) internal successors, (93), 2 states have internal predecessors, (93), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-11-06 20:33:34,407 INFO L276 IsEmpty]: Start isEmpty. Operand 21128 states and 30795 transitions. [2023-11-06 20:33:34,449 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2023-11-06 20:33:34,450 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 20:33:34,450 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 20:33:34,462 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4b1f3db-46df-4fde-a80f-481a85c52b9e/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2023-11-06 20:33:34,657 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4b1f3db-46df-4fde-a80f-481a85c52b9e/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2023-11-06 20:33:34,658 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-06 20:33:34,659 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 20:33:34,659 INFO L85 PathProgramCache]: Analyzing trace with hash -197413980, now seen corresponding path program 1 times [2023-11-06 20:33:34,659 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 20:33:34,659 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1723902204] [2023-11-06 20:33:34,659 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:33:34,660 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 20:33:34,708 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:33:35,448 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2023-11-06 20:33:35,449 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 20:33:35,449 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1723902204] [2023-11-06 20:33:35,449 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1723902204] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-06 20:33:35,449 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-06 20:33:35,450 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2023-11-06 20:33:35,450 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [562639427] [2023-11-06 20:33:35,450 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-06 20:33:35,450 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-11-06 20:33:35,451 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 20:33:35,451 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-11-06 20:33:35,451 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2023-11-06 20:33:35,452 INFO L87 Difference]: Start difference. First operand 21128 states and 30795 transitions. Second operand has 6 states, 6 states have (on average 12.5) internal successors, (75), 6 states have internal predecessors, (75), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2023-11-06 20:33:38,037 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 20:33:38,038 INFO L93 Difference]: Finished difference Result 55020 states and 80557 transitions. [2023-11-06 20:33:38,038 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-11-06 20:33:38,039 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 12.5) internal successors, (75), 6 states have internal predecessors, (75), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) Word has length 129 [2023-11-06 20:33:38,039 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 20:33:38,210 INFO L225 Difference]: With dead ends: 55020 [2023-11-06 20:33:38,210 INFO L226 Difference]: Without dead ends: 33898 [2023-11-06 20:33:38,271 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 [2023-11-06 20:33:38,273 INFO L413 NwaCegarLoop]: 267 mSDtfsCounter, 733 mSDsluCounter, 664 mSDsCounter, 0 mSdLazyCounter, 380 mSolverCounterSat, 101 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 739 SdHoareTripleChecker+Valid, 931 SdHoareTripleChecker+Invalid, 481 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 101 IncrementalHoareTripleChecker+Valid, 380 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-11-06 20:33:38,274 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [739 Valid, 931 Invalid, 481 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [101 Valid, 380 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-11-06 20:33:38,318 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33898 states. [2023-11-06 20:33:40,668 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33898 to 31432. [2023-11-06 20:33:40,714 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31432 states, 26851 states have (on average 1.4457189676362148) internal successors, (38819), 26948 states have internal predecessors, (38819), 3428 states have call successors, (3428), 1152 states have call predecessors, (3428), 1152 states have return successors, (3428), 3332 states have call predecessors, (3428), 3428 states have call successors, (3428) [2023-11-06 20:33:40,923 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31432 states to 31432 states and 45675 transitions. [2023-11-06 20:33:40,929 INFO L78 Accepts]: Start accepts. Automaton has 31432 states and 45675 transitions. Word has length 129 [2023-11-06 20:33:40,930 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 20:33:40,930 INFO L495 AbstractCegarLoop]: Abstraction has 31432 states and 45675 transitions. [2023-11-06 20:33:40,931 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 12.5) internal successors, (75), 6 states have internal predecessors, (75), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2023-11-06 20:33:40,931 INFO L276 IsEmpty]: Start isEmpty. Operand 31432 states and 45675 transitions. [2023-11-06 20:33:41,002 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 132 [2023-11-06 20:33:41,002 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 20:33:41,003 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 20:33:41,003 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2023-11-06 20:33:41,003 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-06 20:33:41,004 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 20:33:41,004 INFO L85 PathProgramCache]: Analyzing trace with hash 1309333737, now seen corresponding path program 1 times [2023-11-06 20:33:41,004 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 20:33:41,004 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [4327805] [2023-11-06 20:33:41,005 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:33:41,005 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 20:33:41,070 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:33:41,790 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2023-11-06 20:33:41,790 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 20:33:41,791 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [4327805] [2023-11-06 20:33:41,791 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [4327805] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-06 20:33:41,791 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-06 20:33:41,791 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2023-11-06 20:33:41,791 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [503036180] [2023-11-06 20:33:41,792 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-06 20:33:41,792 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-11-06 20:33:41,792 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 20:33:41,793 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-11-06 20:33:41,793 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2023-11-06 20:33:41,794 INFO L87 Difference]: Start difference. First operand 31432 states and 45675 transitions. Second operand has 6 states, 6 states have (on average 12.833333333333334) internal successors, (77), 6 states have internal predecessors, (77), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8)