./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/systemc/token_ring.08.cil-1.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 0e0057cc Calling Ultimate with: /usr/lib/jvm/java-1.11.0-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dbc2aff6-d1f5-4493-9e3f-648dd75d4178/bin/utaipan-verify-nQ1chXbOIh/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dbc2aff6-d1f5-4493-9e3f-648dd75d4178/bin/utaipan-verify-nQ1chXbOIh/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dbc2aff6-d1f5-4493-9e3f-648dd75d4178/bin/utaipan-verify-nQ1chXbOIh/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dbc2aff6-d1f5-4493-9e3f-648dd75d4178/bin/utaipan-verify-nQ1chXbOIh/config/TaipanReach.xml -i ../../sv-benchmarks/c/systemc/token_ring.08.cil-1.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dbc2aff6-d1f5-4493-9e3f-648dd75d4178/bin/utaipan-verify-nQ1chXbOIh/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dbc2aff6-d1f5-4493-9e3f-648dd75d4178/bin/utaipan-verify-nQ1chXbOIh --witnessprinter.witness.filename witness --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 42e706fd1a5bd201d46dd2f3322f156b6d900789b8c9ace16cba5458f69fdc62 --- Real Ultimate output --- This is Ultimate 0.2.4-dev-0e0057c [2023-12-02 16:29:14,861 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-12-02 16:29:14,930 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dbc2aff6-d1f5-4493-9e3f-648dd75d4178/bin/utaipan-verify-nQ1chXbOIh/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-12-02 16:29:14,935 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-12-02 16:29:14,935 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-12-02 16:29:14,961 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-12-02 16:29:14,962 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-12-02 16:29:14,962 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-12-02 16:29:14,963 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-12-02 16:29:14,964 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-12-02 16:29:14,964 INFO L153 SettingsManager]: * User list type=DISABLED [2023-12-02 16:29:14,965 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-12-02 16:29:14,966 INFO L153 SettingsManager]: * Explicit value domain=true [2023-12-02 16:29:14,966 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-12-02 16:29:14,967 INFO L153 SettingsManager]: * Octagon Domain=false [2023-12-02 16:29:14,967 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-12-02 16:29:14,968 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-12-02 16:29:14,968 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-12-02 16:29:14,969 INFO L153 SettingsManager]: * Interval Domain=false [2023-12-02 16:29:14,970 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-12-02 16:29:14,970 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-12-02 16:29:14,971 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-12-02 16:29:14,972 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-12-02 16:29:14,972 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-12-02 16:29:14,973 INFO L153 SettingsManager]: * sizeof long=4 [2023-12-02 16:29:14,973 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-12-02 16:29:14,974 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-12-02 16:29:14,974 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-12-02 16:29:14,975 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-12-02 16:29:14,975 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-12-02 16:29:14,976 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-12-02 16:29:14,976 INFO L153 SettingsManager]: * sizeof long double=12 [2023-12-02 16:29:14,976 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-12-02 16:29:14,977 INFO L153 SettingsManager]: * Use constant arrays=true [2023-12-02 16:29:14,977 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-12-02 16:29:14,977 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-12-02 16:29:14,977 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-12-02 16:29:14,978 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-12-02 16:29:14,978 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-12-02 16:29:14,978 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-12-02 16:29:14,978 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-12-02 16:29:14,979 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-12-02 16:29:14,979 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-12-02 16:29:14,979 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-12-02 16:29:14,979 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-12-02 16:29:14,979 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-12-02 16:29:14,980 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-12-02 16:29:14,980 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_dbc2aff6-d1f5-4493-9e3f-648dd75d4178/bin/utaipan-verify-nQ1chXbOIh/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dbc2aff6-d1f5-4493-9e3f-648dd75d4178/bin/utaipan-verify-nQ1chXbOIh Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 42e706fd1a5bd201d46dd2f3322f156b6d900789b8c9ace16cba5458f69fdc62 [2023-12-02 16:29:15,201 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-12-02 16:29:15,225 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-12-02 16:29:15,228 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-12-02 16:29:15,230 INFO L270 PluginConnector]: Initializing CDTParser... [2023-12-02 16:29:15,230 INFO L274 PluginConnector]: CDTParser initialized [2023-12-02 16:29:15,232 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dbc2aff6-d1f5-4493-9e3f-648dd75d4178/bin/utaipan-verify-nQ1chXbOIh/../../sv-benchmarks/c/systemc/token_ring.08.cil-1.c [2023-12-02 16:29:18,139 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-12-02 16:29:18,351 INFO L384 CDTParser]: Found 1 translation units. [2023-12-02 16:29:18,352 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dbc2aff6-d1f5-4493-9e3f-648dd75d4178/sv-benchmarks/c/systemc/token_ring.08.cil-1.c [2023-12-02 16:29:18,369 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dbc2aff6-d1f5-4493-9e3f-648dd75d4178/bin/utaipan-verify-nQ1chXbOIh/data/3b5470aff/95df2b17355445b88c4b1889c39865f5/FLAG3840a5e3a [2023-12-02 16:29:18,386 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dbc2aff6-d1f5-4493-9e3f-648dd75d4178/bin/utaipan-verify-nQ1chXbOIh/data/3b5470aff/95df2b17355445b88c4b1889c39865f5 [2023-12-02 16:29:18,389 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-12-02 16:29:18,391 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-12-02 16:29:18,393 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-12-02 16:29:18,393 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-12-02 16:29:18,400 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-12-02 16:29:18,400 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.12 04:29:18" (1/1) ... [2023-12-02 16:29:18,402 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@313870ec and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 04:29:18, skipping insertion in model container [2023-12-02 16:29:18,402 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.12 04:29:18" (1/1) ... [2023-12-02 16:29:18,465 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-12-02 16:29:18,630 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_dbc2aff6-d1f5-4493-9e3f-648dd75d4178/sv-benchmarks/c/systemc/token_ring.08.cil-1.c[671,684] [2023-12-02 16:29:18,749 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-12-02 16:29:18,763 INFO L202 MainTranslator]: Completed pre-run [2023-12-02 16:29:18,778 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_dbc2aff6-d1f5-4493-9e3f-648dd75d4178/sv-benchmarks/c/systemc/token_ring.08.cil-1.c[671,684] [2023-12-02 16:29:18,840 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-12-02 16:29:18,864 INFO L206 MainTranslator]: Completed translation [2023-12-02 16:29:18,865 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 04:29:18 WrapperNode [2023-12-02 16:29:18,865 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-12-02 16:29:18,866 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-12-02 16:29:18,866 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-12-02 16:29:18,866 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-12-02 16:29:18,875 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 04:29:18" (1/1) ... [2023-12-02 16:29:18,892 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 04:29:18" (1/1) ... [2023-12-02 16:29:18,935 INFO L138 Inliner]: procedures = 44, calls = 55, calls flagged for inlining = 28, calls inlined = 28, statements flattened = 639 [2023-12-02 16:29:18,936 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-12-02 16:29:18,936 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-12-02 16:29:18,937 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-12-02 16:29:18,937 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-12-02 16:29:18,947 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 04:29:18" (1/1) ... [2023-12-02 16:29:18,948 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 04:29:18" (1/1) ... [2023-12-02 16:29:18,952 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 04:29:18" (1/1) ... [2023-12-02 16:29:18,952 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 04:29:18" (1/1) ... [2023-12-02 16:29:18,963 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 04:29:18" (1/1) ... [2023-12-02 16:29:18,972 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 04:29:18" (1/1) ... [2023-12-02 16:29:18,974 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 04:29:18" (1/1) ... [2023-12-02 16:29:18,976 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 04:29:18" (1/1) ... [2023-12-02 16:29:18,981 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-12-02 16:29:18,982 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-12-02 16:29:18,982 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-12-02 16:29:18,982 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-12-02 16:29:18,983 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 04:29:18" (1/1) ... [2023-12-02 16:29:18,991 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-12-02 16:29:19,004 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dbc2aff6-d1f5-4493-9e3f-648dd75d4178/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:29:19,021 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dbc2aff6-d1f5-4493-9e3f-648dd75d4178/bin/utaipan-verify-nQ1chXbOIh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-12-02 16:29:19,036 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dbc2aff6-d1f5-4493-9e3f-648dd75d4178/bin/utaipan-verify-nQ1chXbOIh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-12-02 16:29:19,068 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-12-02 16:29:19,084 INFO L130 BoogieDeclarations]: Found specification of procedure fire_delta_events [2023-12-02 16:29:19,084 INFO L138 BoogieDeclarations]: Found implementation of procedure fire_delta_events [2023-12-02 16:29:19,084 INFO L130 BoogieDeclarations]: Found specification of procedure activate_threads [2023-12-02 16:29:19,084 INFO L138 BoogieDeclarations]: Found implementation of procedure activate_threads [2023-12-02 16:29:19,085 INFO L130 BoogieDeclarations]: Found specification of procedure immediate_notify [2023-12-02 16:29:19,085 INFO L138 BoogieDeclarations]: Found implementation of procedure immediate_notify [2023-12-02 16:29:19,085 INFO L130 BoogieDeclarations]: Found specification of procedure exists_runnable_thread [2023-12-02 16:29:19,085 INFO L138 BoogieDeclarations]: Found implementation of procedure exists_runnable_thread [2023-12-02 16:29:19,085 INFO L130 BoogieDeclarations]: Found specification of procedure reset_delta_events [2023-12-02 16:29:19,085 INFO L138 BoogieDeclarations]: Found implementation of procedure reset_delta_events [2023-12-02 16:29:19,086 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-12-02 16:29:19,086 INFO L130 BoogieDeclarations]: Found specification of procedure update_channels [2023-12-02 16:29:19,086 INFO L138 BoogieDeclarations]: Found implementation of procedure update_channels [2023-12-02 16:29:19,086 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-12-02 16:29:19,086 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-12-02 16:29:19,222 INFO L241 CfgBuilder]: Building ICFG [2023-12-02 16:29:19,225 INFO L267 CfgBuilder]: Building CFG for each procedure with an implementation [2023-12-02 16:29:19,802 INFO L282 CfgBuilder]: Performing block encoding [2023-12-02 16:29:20,138 INFO L304 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-12-02 16:29:20,139 INFO L309 CfgBuilder]: Removed 11 assume(true) statements. [2023-12-02 16:29:20,140 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.12 04:29:20 BoogieIcfgContainer [2023-12-02 16:29:20,141 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-12-02 16:29:20,143 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-12-02 16:29:20,144 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-12-02 16:29:20,146 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-12-02 16:29:20,147 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.12 04:29:18" (1/3) ... [2023-12-02 16:29:20,147 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@36597353 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.12 04:29:20, skipping insertion in model container [2023-12-02 16:29:20,148 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 04:29:18" (2/3) ... [2023-12-02 16:29:20,148 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@36597353 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.12 04:29:20, skipping insertion in model container [2023-12-02 16:29:20,148 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.12 04:29:20" (3/3) ... [2023-12-02 16:29:20,150 INFO L112 eAbstractionObserver]: Analyzing ICFG token_ring.08.cil-1.c [2023-12-02 16:29:20,167 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-12-02 16:29:20,167 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-12-02 16:29:20,218 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-12-02 16:29:20,225 INFO L357 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopHeads, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mPorIndependenceSettings=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@278d0a10, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-12-02 16:29:20,225 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-12-02 16:29:20,230 INFO L276 IsEmpty]: Start isEmpty. Operand has 153 states, 123 states have (on average 1.5040650406504066) internal successors, (185), 125 states have internal predecessors, (185), 22 states have call successors, (22), 6 states have call predecessors, (22), 6 states have return successors, (22), 22 states have call predecessors, (22), 22 states have call successors, (22) [2023-12-02 16:29:20,241 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2023-12-02 16:29:20,242 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:29:20,242 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] [2023-12-02 16:29:20,243 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:29:20,248 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:29:20,249 INFO L85 PathProgramCache]: Analyzing trace with hash 326566009, now seen corresponding path program 1 times [2023-12-02 16:29:20,257 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:29:20,258 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1693236229] [2023-12-02 16:29:20,258 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:29:20,258 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:29:20,411 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:29:20,685 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 16:29:20,686 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:29:20,687 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1693236229] [2023-12-02 16:29:20,688 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1693236229] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:29:20,688 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 16:29:20,688 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-12-02 16:29:20,690 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [812375795] [2023-12-02 16:29:20,691 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:29:20,696 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-12-02 16:29:20,697 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:29:20,730 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-12-02 16:29:20,731 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-12-02 16:29:20,734 INFO L87 Difference]: Start difference. First operand has 153 states, 123 states have (on average 1.5040650406504066) internal successors, (185), 125 states have internal predecessors, (185), 22 states have call successors, (22), 6 states have call predecessors, (22), 6 states have return successors, (22), 22 states have call predecessors, (22), 22 states have call successors, (22) Second operand has 4 states, 4 states have (on average 11.0) internal successors, (44), 4 states have internal predecessors, (44), 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) [2023-12-02 16:29:21,241 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:29:21,242 INFO L93 Difference]: Finished difference Result 442 states and 685 transitions. [2023-12-02 16:29:21,243 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-12-02 16:29:21,245 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 11.0) internal successors, (44), 4 states have internal predecessors, (44), 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 54 [2023-12-02 16:29:21,245 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:29:21,260 INFO L225 Difference]: With dead ends: 442 [2023-12-02 16:29:21,260 INFO L226 Difference]: Without dead ends: 290 [2023-12-02 16:29:21,267 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 [2023-12-02 16:29:21,272 INFO L413 NwaCegarLoop]: 352 mSDtfsCounter, 394 mSDsluCounter, 270 mSDsCounter, 0 mSdLazyCounter, 232 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 394 SdHoareTripleChecker+Valid, 622 SdHoareTripleChecker+Invalid, 245 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 232 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-12-02 16:29:21,273 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [394 Valid, 622 Invalid, 245 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 232 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-12-02 16:29:21,295 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 290 states. [2023-12-02 16:29:21,348 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 290 to 289. [2023-12-02 16:29:21,351 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 289 states, 236 states have (on average 1.4491525423728813) internal successors, (342), 238 states have internal predecessors, (342), 40 states have call successors, (40), 12 states have call predecessors, (40), 12 states have return successors, (40), 39 states have call predecessors, (40), 40 states have call successors, (40) [2023-12-02 16:29:21,355 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 289 states to 289 states and 422 transitions. [2023-12-02 16:29:21,356 INFO L78 Accepts]: Start accepts. Automaton has 289 states and 422 transitions. Word has length 54 [2023-12-02 16:29:21,357 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:29:21,357 INFO L495 AbstractCegarLoop]: Abstraction has 289 states and 422 transitions. [2023-12-02 16:29:21,357 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 11.0) internal successors, (44), 4 states have internal predecessors, (44), 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) [2023-12-02 16:29:21,357 INFO L276 IsEmpty]: Start isEmpty. Operand 289 states and 422 transitions. [2023-12-02 16:29:21,364 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 109 [2023-12-02 16:29:21,365 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:29:21,365 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:29:21,365 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-12-02 16:29:21,366 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:29:21,366 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:29:21,366 INFO L85 PathProgramCache]: Analyzing trace with hash 801736412, now seen corresponding path program 1 times [2023-12-02 16:29:21,367 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:29:21,367 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1669595025] [2023-12-02 16:29:21,367 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:29:21,367 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:29:21,405 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:29:21,652 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2023-12-02 16:29:21,652 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:29:21,653 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1669595025] [2023-12-02 16:29:21,653 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1669595025] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:29:21,653 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [321709003] [2023-12-02 16:29:21,654 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:29:21,654 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:29:21,654 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dbc2aff6-d1f5-4493-9e3f-648dd75d4178/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:29:21,655 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dbc2aff6-d1f5-4493-9e3f-648dd75d4178/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:29:21,659 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dbc2aff6-d1f5-4493-9e3f-648dd75d4178/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-12-02 16:29:21,910 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:29:21,915 INFO L262 TraceCheckSpWp]: Trace formula consists of 709 conjuncts, 2 conjunts are in the unsatisfiable core [2023-12-02 16:29:21,928 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:29:22,010 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2023-12-02 16:29:22,010 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 16:29:22,014 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [321709003] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:29:22,015 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 16:29:22,015 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2023-12-02 16:29:22,016 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1543912950] [2023-12-02 16:29:22,016 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:29:22,017 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 16:29:22,017 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:29:22,018 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 16:29:22,018 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-12-02 16:29:22,018 INFO L87 Difference]: Start difference. First operand 289 states and 422 transitions. Second operand has 3 states, 3 states have (on average 22.0) internal successors, (66), 2 states have internal predecessors, (66), 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) [2023-12-02 16:29:22,166 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:29:22,166 INFO L93 Difference]: Finished difference Result 850 states and 1261 transitions. [2023-12-02 16:29:22,166 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 16:29:22,167 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 22.0) internal successors, (66), 2 states have internal predecessors, (66), 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 108 [2023-12-02 16:29:22,167 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:29:22,174 INFO L225 Difference]: With dead ends: 850 [2023-12-02 16:29:22,174 INFO L226 Difference]: Without dead ends: 566 [2023-12-02 16:29:22,176 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 112 GetRequests, 108 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-12-02 16:29:22,178 INFO L413 NwaCegarLoop]: 228 mSDtfsCounter, 198 mSDsluCounter, 174 mSDsCounter, 0 mSdLazyCounter, 79 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 198 SdHoareTripleChecker+Valid, 402 SdHoareTripleChecker+Invalid, 81 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 79 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 16:29:22,178 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [198 Valid, 402 Invalid, 81 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 79 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 16:29:22,180 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 566 states. [2023-12-02 16:29:22,219 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 566 to 562. [2023-12-02 16:29:22,221 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 562 states, 463 states have (on average 1.4449244060475162) internal successors, (669), 466 states have internal predecessors, (669), 74 states have call successors, (74), 24 states have call predecessors, (74), 24 states have return successors, (74), 72 states have call predecessors, (74), 74 states have call successors, (74) [2023-12-02 16:29:22,227 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 562 states to 562 states and 817 transitions. [2023-12-02 16:29:22,227 INFO L78 Accepts]: Start accepts. Automaton has 562 states and 817 transitions. Word has length 108 [2023-12-02 16:29:22,227 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:29:22,228 INFO L495 AbstractCegarLoop]: Abstraction has 562 states and 817 transitions. [2023-12-02 16:29:22,228 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 22.0) internal successors, (66), 2 states have internal predecessors, (66), 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) [2023-12-02 16:29:22,228 INFO L276 IsEmpty]: Start isEmpty. Operand 562 states and 817 transitions. [2023-12-02 16:29:22,232 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 109 [2023-12-02 16:29:22,232 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:29:22,233 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:29:22,245 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dbc2aff6-d1f5-4493-9e3f-648dd75d4178/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-12-02 16:29:22,433 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dbc2aff6-d1f5-4493-9e3f-648dd75d4178/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2023-12-02 16:29:22,434 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:29:22,434 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:29:22,434 INFO L85 PathProgramCache]: Analyzing trace with hash 1576731772, now seen corresponding path program 1 times [2023-12-02 16:29:22,435 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:29:22,435 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1598279974] [2023-12-02 16:29:22,435 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:29:22,435 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:29:22,465 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:29:22,637 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2023-12-02 16:29:22,638 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:29:22,638 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1598279974] [2023-12-02 16:29:22,638 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1598279974] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:29:22,639 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2109855759] [2023-12-02 16:29:22,639 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:29:22,639 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:29:22,639 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dbc2aff6-d1f5-4493-9e3f-648dd75d4178/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:29:22,640 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dbc2aff6-d1f5-4493-9e3f-648dd75d4178/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:29:22,647 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dbc2aff6-d1f5-4493-9e3f-648dd75d4178/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-12-02 16:29:22,840 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:29:22,843 INFO L262 TraceCheckSpWp]: Trace formula consists of 703 conjuncts, 2 conjunts are in the unsatisfiable core [2023-12-02 16:29:22,849 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:29:22,893 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2023-12-02 16:29:22,893 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 16:29:22,894 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2109855759] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:29:22,894 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 16:29:22,894 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2023-12-02 16:29:22,894 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [300215885] [2023-12-02 16:29:22,895 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:29:22,895 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 16:29:22,896 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:29:22,896 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 16:29:22,897 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-12-02 16:29:22,897 INFO L87 Difference]: Start difference. First operand 562 states and 817 transitions. Second operand has 3 states, 3 states have (on average 23.0) internal successors, (69), 2 states have internal predecessors, (69), 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) [2023-12-02 16:29:23,055 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:29:23,055 INFO L93 Difference]: Finished difference Result 1663 states and 2456 transitions. [2023-12-02 16:29:23,055 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 16:29:23,056 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 23.0) internal successors, (69), 2 states have internal predecessors, (69), 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 108 [2023-12-02 16:29:23,056 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:29:23,064 INFO L225 Difference]: With dead ends: 1663 [2023-12-02 16:29:23,064 INFO L226 Difference]: Without dead ends: 1106 [2023-12-02 16:29:23,066 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 112 GetRequests, 108 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-12-02 16:29:23,067 INFO L413 NwaCegarLoop]: 226 mSDtfsCounter, 195 mSDsluCounter, 174 mSDsCounter, 0 mSdLazyCounter, 79 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 195 SdHoareTripleChecker+Valid, 400 SdHoareTripleChecker+Invalid, 81 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 79 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 16:29:23,068 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [195 Valid, 400 Invalid, 81 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 79 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 16:29:23,070 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1106 states. [2023-12-02 16:29:23,118 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1106 to 1100. [2023-12-02 16:29:23,120 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1100 states, 911 states have (on average 1.4390779363336992) internal successors, (1311), 916 states have internal predecessors, (1311), 140 states have call successors, (140), 48 states have call predecessors, (140), 48 states have return successors, (140), 136 states have call predecessors, (140), 140 states have call successors, (140) [2023-12-02 16:29:23,127 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1100 states to 1100 states and 1591 transitions. [2023-12-02 16:29:23,128 INFO L78 Accepts]: Start accepts. Automaton has 1100 states and 1591 transitions. Word has length 108 [2023-12-02 16:29:23,128 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:29:23,128 INFO L495 AbstractCegarLoop]: Abstraction has 1100 states and 1591 transitions. [2023-12-02 16:29:23,128 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 23.0) internal successors, (69), 2 states have internal predecessors, (69), 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) [2023-12-02 16:29:23,129 INFO L276 IsEmpty]: Start isEmpty. Operand 1100 states and 1591 transitions. [2023-12-02 16:29:23,132 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 109 [2023-12-02 16:29:23,133 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:29:23,133 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:29:23,139 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dbc2aff6-d1f5-4493-9e3f-648dd75d4178/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2023-12-02 16:29:23,335 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dbc2aff6-d1f5-4493-9e3f-648dd75d4178/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:29:23,335 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:29:23,336 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:29:23,336 INFO L85 PathProgramCache]: Analyzing trace with hash -1085052196, now seen corresponding path program 1 times [2023-12-02 16:29:23,336 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:29:23,336 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [644910468] [2023-12-02 16:29:23,336 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:29:23,337 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:29:23,357 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:29:23,484 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2023-12-02 16:29:23,484 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:29:23,484 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [644910468] [2023-12-02 16:29:23,485 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [644910468] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:29:23,485 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [8975450] [2023-12-02 16:29:23,485 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:29:23,485 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:29:23,486 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dbc2aff6-d1f5-4493-9e3f-648dd75d4178/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:29:23,487 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dbc2aff6-d1f5-4493-9e3f-648dd75d4178/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:29:23,503 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dbc2aff6-d1f5-4493-9e3f-648dd75d4178/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-12-02 16:29:23,699 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:29:23,703 INFO L262 TraceCheckSpWp]: Trace formula consists of 697 conjuncts, 2 conjunts are in the unsatisfiable core [2023-12-02 16:29:23,709 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:29:23,772 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 23 proven. 0 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2023-12-02 16:29:23,772 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 16:29:23,773 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [8975450] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:29:23,773 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 16:29:23,773 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2023-12-02 16:29:23,774 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1668966613] [2023-12-02 16:29:23,774 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:29:23,775 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 16:29:23,775 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:29:23,776 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 16:29:23,776 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-12-02 16:29:23,776 INFO L87 Difference]: Start difference. First operand 1100 states and 1591 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) [2023-12-02 16:29:23,971 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:29:23,971 INFO L93 Difference]: Finished difference Result 3265 states and 4796 transitions. [2023-12-02 16:29:23,971 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 16:29:23,972 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 108 [2023-12-02 16:29:23,972 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:29:23,984 INFO L225 Difference]: With dead ends: 3265 [2023-12-02 16:29:23,984 INFO L226 Difference]: Without dead ends: 2170 [2023-12-02 16:29:23,988 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 112 GetRequests, 108 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-12-02 16:29:23,989 INFO L413 NwaCegarLoop]: 201 mSDtfsCounter, 183 mSDsluCounter, 174 mSDsCounter, 0 mSdLazyCounter, 79 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 183 SdHoareTripleChecker+Valid, 375 SdHoareTripleChecker+Invalid, 81 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 79 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 16:29:23,989 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [183 Valid, 375 Invalid, 81 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 79 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 16:29:23,992 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2170 states. [2023-12-02 16:29:24,065 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2170 to 2160. [2023-12-02 16:29:24,069 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2160 states, 1795 states have (on average 1.4323119777158775) internal successors, (2571), 1804 states have internal predecessors, (2571), 268 states have call successors, (268), 96 states have call predecessors, (268), 96 states have return successors, (268), 260 states have call predecessors, (268), 268 states have call successors, (268) [2023-12-02 16:29:24,117 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2160 states to 2160 states and 3107 transitions. [2023-12-02 16:29:24,117 INFO L78 Accepts]: Start accepts. Automaton has 2160 states and 3107 transitions. Word has length 108 [2023-12-02 16:29:24,118 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:29:24,118 INFO L495 AbstractCegarLoop]: Abstraction has 2160 states and 3107 transitions. [2023-12-02 16:29:24,118 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) [2023-12-02 16:29:24,119 INFO L276 IsEmpty]: Start isEmpty. Operand 2160 states and 3107 transitions. [2023-12-02 16:29:24,124 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 109 [2023-12-02 16:29:24,124 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:29:24,124 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:29:24,130 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dbc2aff6-d1f5-4493-9e3f-648dd75d4178/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2023-12-02 16:29:24,325 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dbc2aff6-d1f5-4493-9e3f-648dd75d4178/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:29:24,325 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:29:24,326 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:29:24,326 INFO L85 PathProgramCache]: Analyzing trace with hash -2008391364, now seen corresponding path program 1 times [2023-12-02 16:29:24,326 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:29:24,327 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1698634954] [2023-12-02 16:29:24,327 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:29:24,327 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:29:24,360 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:29:24,507 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2023-12-02 16:29:24,507 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:29:24,508 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1698634954] [2023-12-02 16:29:24,508 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1698634954] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:29:24,508 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [521481406] [2023-12-02 16:29:24,508 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:29:24,508 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:29:24,509 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dbc2aff6-d1f5-4493-9e3f-648dd75d4178/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:29:24,510 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dbc2aff6-d1f5-4493-9e3f-648dd75d4178/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:29:24,514 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dbc2aff6-d1f5-4493-9e3f-648dd75d4178/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-12-02 16:29:24,698 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:29:24,702 INFO L262 TraceCheckSpWp]: Trace formula consists of 691 conjuncts, 2 conjunts are in the unsatisfiable core [2023-12-02 16:29:24,707 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:29:24,749 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 17 proven. 0 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2023-12-02 16:29:24,749 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 16:29:24,750 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [521481406] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:29:24,750 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 16:29:24,750 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2023-12-02 16:29:24,750 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [962207161] [2023-12-02 16:29:24,751 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:29:24,751 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 16:29:24,751 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:29:24,752 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 16:29:24,752 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-12-02 16:29:24,752 INFO L87 Difference]: Start difference. First operand 2160 states and 3107 transitions. Second operand has 3 states, 3 states have (on average 25.0) internal successors, (75), 2 states have internal predecessors, (75), 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) [2023-12-02 16:29:25,022 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:29:25,023 INFO L93 Difference]: Finished difference Result 6421 states and 9376 transitions. [2023-12-02 16:29:25,023 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 16:29:25,024 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 25.0) internal successors, (75), 2 states have internal predecessors, (75), 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 108 [2023-12-02 16:29:25,024 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:29:25,052 INFO L225 Difference]: With dead ends: 6421 [2023-12-02 16:29:25,052 INFO L226 Difference]: Without dead ends: 4266 [2023-12-02 16:29:25,061 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 112 GetRequests, 108 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-12-02 16:29:25,062 INFO L413 NwaCegarLoop]: 201 mSDtfsCounter, 189 mSDsluCounter, 174 mSDsCounter, 0 mSdLazyCounter, 79 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 189 SdHoareTripleChecker+Valid, 375 SdHoareTripleChecker+Invalid, 81 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 79 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 16:29:25,062 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [189 Valid, 375 Invalid, 81 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 79 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 16:29:25,068 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4266 states. [2023-12-02 16:29:25,238 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4266 to 4248. [2023-12-02 16:29:25,247 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4248 states, 3539 states have (on average 1.4249788075727607) internal successors, (5043), 3556 states have internal predecessors, (5043), 516 states have call successors, (516), 192 states have call predecessors, (516), 192 states have return successors, (516), 500 states have call predecessors, (516), 516 states have call successors, (516) [2023-12-02 16:29:25,276 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4248 states to 4248 states and 6075 transitions. [2023-12-02 16:29:25,277 INFO L78 Accepts]: Start accepts. Automaton has 4248 states and 6075 transitions. Word has length 108 [2023-12-02 16:29:25,277 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:29:25,277 INFO L495 AbstractCegarLoop]: Abstraction has 4248 states and 6075 transitions. [2023-12-02 16:29:25,277 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 25.0) internal successors, (75), 2 states have internal predecessors, (75), 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) [2023-12-02 16:29:25,277 INFO L276 IsEmpty]: Start isEmpty. Operand 4248 states and 6075 transitions. [2023-12-02 16:29:25,287 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 109 [2023-12-02 16:29:25,287 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:29:25,287 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:29:25,294 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dbc2aff6-d1f5-4493-9e3f-648dd75d4178/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2023-12-02 16:29:25,491 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dbc2aff6-d1f5-4493-9e3f-648dd75d4178/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:29:25,492 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:29:25,492 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:29:25,492 INFO L85 PathProgramCache]: Analyzing trace with hash 1409748892, now seen corresponding path program 1 times [2023-12-02 16:29:25,492 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:29:25,492 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [559425580] [2023-12-02 16:29:25,493 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:29:25,493 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:29:25,527 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:29:25,643 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 31 trivial. 0 not checked. [2023-12-02 16:29:25,644 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:29:25,644 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [559425580] [2023-12-02 16:29:25,644 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [559425580] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:29:25,644 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 16:29:25,644 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-12-02 16:29:25,644 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [563298587] [2023-12-02 16:29:25,645 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:29:25,645 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 16:29:25,645 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:29:25,646 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 16:29:25,646 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 16:29:25,646 INFO L87 Difference]: Start difference. First operand 4248 states and 6075 transitions. Second operand has 3 states, 3 states have (on average 21.0) internal successors, (63), 3 states have internal predecessors, (63), 2 states have call successors, (8), 1 states have call predecessors, (8), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2023-12-02 16:29:25,910 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:29:25,910 INFO L93 Difference]: Finished difference Result 7610 states and 11020 transitions. [2023-12-02 16:29:25,910 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 16:29:25,910 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 21.0) internal successors, (63), 3 states have internal predecessors, (63), 2 states have call successors, (8), 1 states have call predecessors, (8), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) Word has length 108 [2023-12-02 16:29:25,911 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:29:25,945 INFO L225 Difference]: With dead ends: 7610 [2023-12-02 16:29:25,945 INFO L226 Difference]: Without dead ends: 5448 [2023-12-02 16:29:25,953 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 16:29:25,954 INFO L413 NwaCegarLoop]: 287 mSDtfsCounter, 99 mSDsluCounter, 192 mSDsCounter, 0 mSdLazyCounter, 94 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 99 SdHoareTripleChecker+Valid, 479 SdHoareTripleChecker+Invalid, 94 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 94 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 16:29:25,955 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [99 Valid, 479 Invalid, 94 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 94 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 16:29:25,962 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5448 states. [2023-12-02 16:29:26,166 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5448 to 5112. [2023-12-02 16:29:26,175 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5112 states, 4371 states have (on average 1.457561198810341) internal successors, (6371), 4388 states have internal predecessors, (6371), 532 states have call successors, (532), 208 states have call predecessors, (532), 208 states have return successors, (532), 516 states have call predecessors, (532), 532 states have call successors, (532) [2023-12-02 16:29:26,190 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5112 states to 5112 states and 7435 transitions. [2023-12-02 16:29:26,190 INFO L78 Accepts]: Start accepts. Automaton has 5112 states and 7435 transitions. Word has length 108 [2023-12-02 16:29:26,191 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:29:26,191 INFO L495 AbstractCegarLoop]: Abstraction has 5112 states and 7435 transitions. [2023-12-02 16:29:26,191 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 21.0) internal successors, (63), 3 states have internal predecessors, (63), 2 states have call successors, (8), 1 states have call predecessors, (8), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2023-12-02 16:29:26,191 INFO L276 IsEmpty]: Start isEmpty. Operand 5112 states and 7435 transitions. [2023-12-02 16:29:26,202 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 148 [2023-12-02 16:29:26,203 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:29:26,203 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:29:26,203 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2023-12-02 16:29:26,204 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:29:26,204 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:29:26,204 INFO L85 PathProgramCache]: Analyzing trace with hash -1130010481, now seen corresponding path program 1 times [2023-12-02 16:29:26,204 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:29:26,205 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1062423359] [2023-12-02 16:29:26,205 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:29:26,205 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:29:26,237 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:29:26,308 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 90 trivial. 0 not checked. [2023-12-02 16:29:26,308 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:29:26,308 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1062423359] [2023-12-02 16:29:26,308 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1062423359] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:29:26,308 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 16:29:26,308 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-12-02 16:29:26,309 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [672640527] [2023-12-02 16:29:26,309 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:29:26,309 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 16:29:26,309 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:29:26,310 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 16:29:26,310 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 16:29:26,310 INFO L87 Difference]: Start difference. First operand 5112 states and 7435 transitions. Second operand has 3 states, 3 states have (on average 23.666666666666668) internal successors, (71), 3 states have internal predecessors, (71), 3 states have call successors, (9), 1 states have call predecessors, (9), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2023-12-02 16:29:26,761 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:29:26,761 INFO L93 Difference]: Finished difference Result 15181 states and 22320 transitions. [2023-12-02 16:29:26,762 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 16:29:26,762 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 23.666666666666668) internal successors, (71), 3 states have internal predecessors, (71), 3 states have call successors, (9), 1 states have call predecessors, (9), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 147 [2023-12-02 16:29:26,762 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:29:26,833 INFO L225 Difference]: With dead ends: 15181 [2023-12-02 16:29:26,833 INFO L226 Difference]: Without dead ends: 10074 [2023-12-02 16:29:26,853 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 16:29:26,854 INFO L413 NwaCegarLoop]: 185 mSDtfsCounter, 184 mSDsluCounter, 174 mSDsCounter, 0 mSdLazyCounter, 74 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 184 SdHoareTripleChecker+Valid, 359 SdHoareTripleChecker+Invalid, 76 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 74 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 16:29:26,854 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [184 Valid, 359 Invalid, 76 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 74 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 16:29:26,870 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10074 states. [2023-12-02 16:29:27,266 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10074 to 10024. [2023-12-02 16:29:27,284 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 10024 states, 8579 states have (on average 1.4476046159226017) internal successors, (12419), 8612 states have internal predecessors, (12419), 1028 states have call successors, (1028), 416 states have call predecessors, (1028), 416 states have return successors, (1028), 996 states have call predecessors, (1028), 1028 states have call successors, (1028) [2023-12-02 16:29:27,313 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10024 states to 10024 states and 14475 transitions. [2023-12-02 16:29:27,314 INFO L78 Accepts]: Start accepts. Automaton has 10024 states and 14475 transitions. Word has length 147 [2023-12-02 16:29:27,314 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:29:27,314 INFO L495 AbstractCegarLoop]: Abstraction has 10024 states and 14475 transitions. [2023-12-02 16:29:27,315 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 23.666666666666668) internal successors, (71), 3 states have internal predecessors, (71), 3 states have call successors, (9), 1 states have call predecessors, (9), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2023-12-02 16:29:27,315 INFO L276 IsEmpty]: Start isEmpty. Operand 10024 states and 14475 transitions. [2023-12-02 16:29:27,339 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 148 [2023-12-02 16:29:27,339 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:29:27,339 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:29:27,339 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2023-12-02 16:29:27,340 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:29:27,340 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:29:27,340 INFO L85 PathProgramCache]: Analyzing trace with hash 1232285216, now seen corresponding path program 1 times [2023-12-02 16:29:27,341 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:29:27,341 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [679030783] [2023-12-02 16:29:27,341 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:29:27,341 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:29:27,368 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:29:27,424 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 90 trivial. 0 not checked. [2023-12-02 16:29:27,424 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:29:27,425 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [679030783] [2023-12-02 16:29:27,425 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [679030783] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:29:27,425 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 16:29:27,425 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-12-02 16:29:27,426 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2001670487] [2023-12-02 16:29:27,426 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:29:27,426 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 16:29:27,427 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:29:27,427 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 16:29:27,428 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 16:29:27,428 INFO L87 Difference]: Start difference. First operand 10024 states and 14475 transitions. Second operand has 3 states, 3 states have (on average 23.666666666666668) internal successors, (71), 3 states have internal predecessors, (71), 3 states have call successors, (9), 1 states have call predecessors, (9), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2023-12-02 16:29:28,151 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:29:28,151 INFO L93 Difference]: Finished difference Result 29773 states and 43440 transitions. [2023-12-02 16:29:28,152 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 16:29:28,152 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 23.666666666666668) internal successors, (71), 3 states have internal predecessors, (71), 3 states have call successors, (9), 1 states have call predecessors, (9), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 147 [2023-12-02 16:29:28,153 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:29:28,245 INFO L225 Difference]: With dead ends: 29773 [2023-12-02 16:29:28,245 INFO L226 Difference]: Without dead ends: 19754 [2023-12-02 16:29:28,281 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 16:29:28,282 INFO L413 NwaCegarLoop]: 185 mSDtfsCounter, 186 mSDsluCounter, 174 mSDsCounter, 0 mSdLazyCounter, 74 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 186 SdHoareTripleChecker+Valid, 359 SdHoareTripleChecker+Invalid, 76 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 74 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 16:29:28,283 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [186 Valid, 359 Invalid, 76 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 74 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 16:29:28,312 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19754 states. [2023-12-02 16:29:29,085 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19754 to 19656. [2023-12-02 16:29:29,116 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19656 states, 16835 states have (on average 1.4371844371844371) internal successors, (24195), 16900 states have internal predecessors, (24195), 1988 states have call successors, (1988), 832 states have call predecessors, (1988), 832 states have return successors, (1988), 1924 states have call predecessors, (1988), 1988 states have call successors, (1988) [2023-12-02 16:29:29,186 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19656 states to 19656 states and 28171 transitions. [2023-12-02 16:29:29,187 INFO L78 Accepts]: Start accepts. Automaton has 19656 states and 28171 transitions. Word has length 147 [2023-12-02 16:29:29,188 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:29:29,188 INFO L495 AbstractCegarLoop]: Abstraction has 19656 states and 28171 transitions. [2023-12-02 16:29:29,189 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 23.666666666666668) internal successors, (71), 3 states have internal predecessors, (71), 3 states have call successors, (9), 1 states have call predecessors, (9), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2023-12-02 16:29:29,189 INFO L276 IsEmpty]: Start isEmpty. Operand 19656 states and 28171 transitions. [2023-12-02 16:29:29,266 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 148 [2023-12-02 16:29:29,266 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:29:29,267 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:29:29,267 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2023-12-02 16:29:29,267 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:29:29,268 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:29:29,268 INFO L85 PathProgramCache]: Analyzing trace with hash -1868040064, now seen corresponding path program 1 times [2023-12-02 16:29:29,268 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:29:29,268 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [338129116] [2023-12-02 16:29:29,268 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:29:29,269 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:29:29,305 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:29:29,387 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 90 trivial. 0 not checked. [2023-12-02 16:29:29,387 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:29:29,388 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [338129116] [2023-12-02 16:29:29,388 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [338129116] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:29:29,388 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 16:29:29,388 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-12-02 16:29:29,388 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [28223958] [2023-12-02 16:29:29,389 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:29:29,389 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 16:29:29,389 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:29:29,390 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 16:29:29,390 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 16:29:29,390 INFO L87 Difference]: Start difference. First operand 19656 states and 28171 transitions. Second operand has 3 states, 3 states have (on average 23.666666666666668) internal successors, (71), 3 states have internal predecessors, (71), 3 states have call successors, (9), 1 states have call predecessors, (9), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2023-12-02 16:29:30,813 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:29:30,814 INFO L93 Difference]: Finished difference Result 58381 states and 84496 transitions. [2023-12-02 16:29:30,814 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 16:29:30,814 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 23.666666666666668) internal successors, (71), 3 states have internal predecessors, (71), 3 states have call successors, (9), 1 states have call predecessors, (9), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 147 [2023-12-02 16:29:30,815 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:29:30,950 INFO L225 Difference]: With dead ends: 58381 [2023-12-02 16:29:30,950 INFO L226 Difference]: Without dead ends: 38730 [2023-12-02 16:29:30,992 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 16:29:30,993 INFO L413 NwaCegarLoop]: 213 mSDtfsCounter, 188 mSDsluCounter, 174 mSDsCounter, 0 mSdLazyCounter, 77 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 188 SdHoareTripleChecker+Valid, 387 SdHoareTripleChecker+Invalid, 79 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 77 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-12-02 16:29:30,994 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [188 Valid, 387 Invalid, 79 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 77 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-12-02 16:29:31,028 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38730 states. [2023-12-02 16:29:32,272 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38730 to 38536. [2023-12-02 16:29:32,297 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38536 states, 33027 states have (on average 1.4263178611439125) internal successors, (47107), 33156 states have internal predecessors, (47107), 3844 states have call successors, (3844), 1664 states have call predecessors, (3844), 1664 states have return successors, (3844), 3716 states have call predecessors, (3844), 3844 states have call successors, (3844) [2023-12-02 16:29:32,407 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38536 states to 38536 states and 54795 transitions. [2023-12-02 16:29:32,409 INFO L78 Accepts]: Start accepts. Automaton has 38536 states and 54795 transitions. Word has length 147 [2023-12-02 16:29:32,409 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:29:32,409 INFO L495 AbstractCegarLoop]: Abstraction has 38536 states and 54795 transitions. [2023-12-02 16:29:32,409 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 23.666666666666668) internal successors, (71), 3 states have internal predecessors, (71), 3 states have call successors, (9), 1 states have call predecessors, (9), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2023-12-02 16:29:32,409 INFO L276 IsEmpty]: Start isEmpty. Operand 38536 states and 54795 transitions. [2023-12-02 16:29:32,506 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 148 [2023-12-02 16:29:32,506 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:29:32,507 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:29:32,507 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2023-12-02 16:29:32,507 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:29:32,507 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:29:32,508 INFO L85 PathProgramCache]: Analyzing trace with hash 557293634, now seen corresponding path program 1 times [2023-12-02 16:29:32,508 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:29:32,508 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1070280748] [2023-12-02 16:29:32,508 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:29:32,508 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:29:32,541 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:29:32,608 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 90 trivial. 0 not checked. [2023-12-02 16:29:32,608 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:29:32,609 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1070280748] [2023-12-02 16:29:32,609 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1070280748] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:29:32,609 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 16:29:32,609 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-12-02 16:29:32,609 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1832967880] [2023-12-02 16:29:32,609 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:29:32,610 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 16:29:32,610 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:29:32,610 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 16:29:32,610 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 16:29:32,610 INFO L87 Difference]: Start difference. First operand 38536 states and 54795 transitions. Second operand has 3 states, 3 states have (on average 23.666666666666668) internal successors, (71), 3 states have internal predecessors, (71), 3 states have call successors, (9), 1 states have call predecessors, (9), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2023-12-02 16:29:35,504 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:29:35,504 INFO L93 Difference]: Finished difference Result 114445 states and 164240 transitions. [2023-12-02 16:29:35,505 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 16:29:35,505 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 23.666666666666668) internal successors, (71), 3 states have internal predecessors, (71), 3 states have call successors, (9), 1 states have call predecessors, (9), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 147 [2023-12-02 16:29:35,505 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:29:35,740 INFO L225 Difference]: With dead ends: 114445 [2023-12-02 16:29:35,740 INFO L226 Difference]: Without dead ends: 75914 [2023-12-02 16:29:35,799 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 16:29:35,799 INFO L413 NwaCegarLoop]: 203 mSDtfsCounter, 191 mSDsluCounter, 174 mSDsCounter, 0 mSdLazyCounter, 74 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 191 SdHoareTripleChecker+Valid, 377 SdHoareTripleChecker+Invalid, 76 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 74 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 16:29:35,800 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [191 Valid, 377 Invalid, 76 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 74 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 16:29:35,857 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75914 states. [2023-12-02 16:29:38,308 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75914 to 75528. [2023-12-02 16:29:38,366 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75528 states, 64771 states have (on average 1.415000540365287) internal successors, (91651), 65028 states have internal predecessors, (91651), 7428 states have call successors, (7428), 3328 states have call predecessors, (7428), 3328 states have return successors, (7428), 7172 states have call predecessors, (7428), 7428 states have call successors, (7428) [2023-12-02 16:29:38,676 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75528 states to 75528 states and 106507 transitions. [2023-12-02 16:29:38,679 INFO L78 Accepts]: Start accepts. Automaton has 75528 states and 106507 transitions. Word has length 147 [2023-12-02 16:29:38,679 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:29:38,679 INFO L495 AbstractCegarLoop]: Abstraction has 75528 states and 106507 transitions. [2023-12-02 16:29:38,680 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 23.666666666666668) internal successors, (71), 3 states have internal predecessors, (71), 3 states have call successors, (9), 1 states have call predecessors, (9), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2023-12-02 16:29:38,680 INFO L276 IsEmpty]: Start isEmpty. Operand 75528 states and 106507 transitions. [2023-12-02 16:29:38,864 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 171 [2023-12-02 16:29:38,864 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:29:38,864 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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] [2023-12-02 16:29:38,865 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2023-12-02 16:29:38,865 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:29:38,865 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:29:38,865 INFO L85 PathProgramCache]: Analyzing trace with hash -1873859753, now seen corresponding path program 1 times [2023-12-02 16:29:38,866 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:29:38,866 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1712262170] [2023-12-02 16:29:38,866 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:29:38,866 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:29:38,905 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:29:39,359 INFO L134 CoverageAnalysis]: Checked inductivity of 123 backedges. 10 proven. 57 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2023-12-02 16:29:39,360 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:29:39,360 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1712262170] [2023-12-02 16:29:39,360 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1712262170] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:29:39,360 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [495852766] [2023-12-02 16:29:39,361 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:29:39,361 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:29:39,361 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dbc2aff6-d1f5-4493-9e3f-648dd75d4178/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:29:39,362 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dbc2aff6-d1f5-4493-9e3f-648dd75d4178/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:29:39,366 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dbc2aff6-d1f5-4493-9e3f-648dd75d4178/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-12-02 16:29:39,613 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:29:39,617 INFO L262 TraceCheckSpWp]: Trace formula consists of 925 conjuncts, 3 conjunts are in the unsatisfiable core [2023-12-02 16:29:39,625 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:29:39,686 INFO L134 CoverageAnalysis]: Checked inductivity of 123 backedges. 97 proven. 0 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2023-12-02 16:29:39,686 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 16:29:39,686 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [495852766] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:29:39,686 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 16:29:39,687 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2023-12-02 16:29:39,687 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [609699465] [2023-12-02 16:29:39,687 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:29:39,688 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 16:29:39,688 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:29:39,689 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 16:29:39,689 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-12-02 16:29:39,690 INFO L87 Difference]: Start difference. First operand 75528 states and 106507 transitions. Second operand has 3 states, 3 states have (on average 41.333333333333336) internal successors, (124), 3 states have internal predecessors, (124), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2023-12-02 16:29:42,225 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:29:42,226 INFO L93 Difference]: Finished difference Result 114316 states and 163725 transitions. [2023-12-02 16:29:42,226 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 16:29:42,227 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 41.333333333333336) internal successors, (124), 3 states have internal predecessors, (124), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) Word has length 170 [2023-12-02 16:29:42,227 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:29:42,563 INFO L225 Difference]: With dead ends: 114316 [2023-12-02 16:29:42,563 INFO L226 Difference]: Without dead ends: 75786 [2023-12-02 16:29:42,640 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 177 GetRequests, 172 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-12-02 16:29:42,641 INFO L413 NwaCegarLoop]: 335 mSDtfsCounter, 180 mSDsluCounter, 177 mSDsCounter, 0 mSdLazyCounter, 104 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 180 SdHoareTripleChecker+Valid, 512 SdHoareTripleChecker+Invalid, 106 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 104 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 16:29:42,642 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [180 Valid, 512 Invalid, 106 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 104 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 16:29:42,705 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75786 states. [2023-12-02 16:29:45,227 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75786 to 75272. [2023-12-02 16:29:45,283 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75272 states, 64515 states have (on average 1.4007750135627373) internal successors, (90371), 64772 states have internal predecessors, (90371), 7428 states have call successors, (7428), 3328 states have call predecessors, (7428), 3328 states have return successors, (7428), 7172 states have call predecessors, (7428), 7428 states have call successors, (7428) [2023-12-02 16:29:45,570 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75272 states to 75272 states and 105227 transitions. [2023-12-02 16:29:45,574 INFO L78 Accepts]: Start accepts. Automaton has 75272 states and 105227 transitions. Word has length 170 [2023-12-02 16:29:45,574 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:29:45,575 INFO L495 AbstractCegarLoop]: Abstraction has 75272 states and 105227 transitions. [2023-12-02 16:29:45,575 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 41.333333333333336) internal successors, (124), 3 states have internal predecessors, (124), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2023-12-02 16:29:45,575 INFO L276 IsEmpty]: Start isEmpty. Operand 75272 states and 105227 transitions. [2023-12-02 16:29:45,759 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 171 [2023-12-02 16:29:45,759 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:29:45,760 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:29:45,766 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dbc2aff6-d1f5-4493-9e3f-648dd75d4178/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2023-12-02 16:29:45,960 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dbc2aff6-d1f5-4493-9e3f-648dd75d4178/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2023-12-02 16:29:45,961 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:29:45,961 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:29:45,961 INFO L85 PathProgramCache]: Analyzing trace with hash 1668335927, now seen corresponding path program 1 times [2023-12-02 16:29:45,961 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:29:45,961 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1317045068] [2023-12-02 16:29:45,961 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:29:45,962 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:29:45,994 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:29:46,316 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 10 proven. 55 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2023-12-02 16:29:46,317 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:29:46,317 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1317045068] [2023-12-02 16:29:46,317 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1317045068] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:29:46,317 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [597231153] [2023-12-02 16:29:46,317 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:29:46,317 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:29:46,318 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dbc2aff6-d1f5-4493-9e3f-648dd75d4178/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:29:46,319 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dbc2aff6-d1f5-4493-9e3f-648dd75d4178/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:29:46,321 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dbc2aff6-d1f5-4493-9e3f-648dd75d4178/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-12-02 16:29:46,668 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:29:46,672 INFO L262 TraceCheckSpWp]: Trace formula consists of 931 conjuncts, 2 conjunts are in the unsatisfiable core [2023-12-02 16:29:46,675 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:29:46,709 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 86 proven. 0 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2023-12-02 16:29:46,709 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 16:29:46,710 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [597231153] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:29:46,710 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 16:29:46,710 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2023-12-02 16:29:46,710 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1061285095] [2023-12-02 16:29:46,710 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:29:46,711 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 16:29:46,711 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:29:46,711 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 16:29:46,711 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-12-02 16:29:46,712 INFO L87 Difference]: Start difference. First operand 75272 states and 105227 transitions. Second operand has 3 states, 3 states have (on average 39.333333333333336) internal successors, (118), 3 states have internal predecessors, (118), 3 states have call successors, (10), 3 states have call predecessors, (10), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) [2023-12-02 16:29:48,762 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:29:48,762 INFO L93 Difference]: Finished difference Result 132100 states and 182790 transitions. [2023-12-02 16:29:48,762 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 16:29:48,762 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 39.333333333333336) internal successors, (118), 3 states have internal predecessors, (118), 3 states have call successors, (10), 3 states have call predecessors, (10), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) Word has length 170 [2023-12-02 16:29:48,763 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:29:49,017 INFO L225 Difference]: With dead ends: 132100 [2023-12-02 16:29:49,017 INFO L226 Difference]: Without dead ends: 93954 [2023-12-02 16:29:49,111 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 177 GetRequests, 172 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-12-02 16:29:49,112 INFO L413 NwaCegarLoop]: 211 mSDtfsCounter, 192 mSDsluCounter, 49 mSDsCounter, 0 mSdLazyCounter, 48 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 192 SdHoareTripleChecker+Valid, 260 SdHoareTripleChecker+Invalid, 52 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 48 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 16:29:49,113 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [192 Valid, 260 Invalid, 52 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 48 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 16:29:49,204 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93954 states. [2023-12-02 16:29:52,189 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93954 to 93954. [2023-12-02 16:29:52,250 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 93954 states, 81665 states have (on average 1.3636319108553236) internal successors, (111361), 81922 states have internal predecessors, (111361), 7938 states have call successors, (7938), 4350 states have call predecessors, (7938), 4350 states have return successors, (7938), 7682 states have call predecessors, (7938), 7938 states have call successors, (7938) [2023-12-02 16:29:52,553 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93954 states to 93954 states and 127237 transitions. [2023-12-02 16:29:52,557 INFO L78 Accepts]: Start accepts. Automaton has 93954 states and 127237 transitions. Word has length 170 [2023-12-02 16:29:52,557 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:29:52,557 INFO L495 AbstractCegarLoop]: Abstraction has 93954 states and 127237 transitions. [2023-12-02 16:29:52,558 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 39.333333333333336) internal successors, (118), 3 states have internal predecessors, (118), 3 states have call successors, (10), 3 states have call predecessors, (10), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) [2023-12-02 16:29:52,558 INFO L276 IsEmpty]: Start isEmpty. Operand 93954 states and 127237 transitions. [2023-12-02 16:29:52,761 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 168 [2023-12-02 16:29:52,762 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:29:52,762 INFO L195 NwaCegarLoop]: trace histogram [5, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:29:52,769 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dbc2aff6-d1f5-4493-9e3f-648dd75d4178/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2023-12-02 16:29:52,962 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dbc2aff6-d1f5-4493-9e3f-648dd75d4178/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2023-12-02 16:29:52,963 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:29:52,963 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:29:52,964 INFO L85 PathProgramCache]: Analyzing trace with hash -687678662, now seen corresponding path program 1 times [2023-12-02 16:29:52,964 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:29:52,964 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1631839624] [2023-12-02 16:29:52,964 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:29:52,964 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:29:53,008 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:29:53,600 INFO L134 CoverageAnalysis]: Checked inductivity of 127 backedges. 12 proven. 56 refuted. 0 times theorem prover too weak. 59 trivial. 0 not checked. [2023-12-02 16:29:53,600 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:29:53,601 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1631839624] [2023-12-02 16:29:53,601 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1631839624] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:29:53,601 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [299102873] [2023-12-02 16:29:53,601 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:29:53,601 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:29:53,601 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dbc2aff6-d1f5-4493-9e3f-648dd75d4178/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:29:53,602 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dbc2aff6-d1f5-4493-9e3f-648dd75d4178/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:29:53,604 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dbc2aff6-d1f5-4493-9e3f-648dd75d4178/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-12-02 16:29:54,017 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:29:54,024 INFO L262 TraceCheckSpWp]: Trace formula consists of 1058 conjuncts, 24 conjunts are in the unsatisfiable core [2023-12-02 16:29:54,031 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:29:54,268 INFO L134 CoverageAnalysis]: Checked inductivity of 127 backedges. 82 proven. 23 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2023-12-02 16:29:54,268 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 16:29:54,712 INFO L134 CoverageAnalysis]: Checked inductivity of 127 backedges. 13 proven. 56 refuted. 0 times theorem prover too weak. 58 trivial. 0 not checked. [2023-12-02 16:29:54,712 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [299102873] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 16:29:54,712 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1022678769] [2023-12-02 16:29:54,738 INFO L159 IcfgInterpreter]: Started Sifa with 85 locations of interest [2023-12-02 16:29:54,738 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 16:29:54,742 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 16:29:54,748 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 16:29:54,748 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 16:30:11,698 INFO L197 IcfgInterpreter]: Interpreting procedure reset_delta_events with input of size 1 for LOIs [2023-12-02 16:30:11,714 INFO L197 IcfgInterpreter]: Interpreting procedure fire_delta_events with input of size 182 for LOIs [2023-12-02 16:30:11,908 INFO L197 IcfgInterpreter]: Interpreting procedure update_channels with input of size 1 for LOIs [2023-12-02 16:30:11,909 INFO L197 IcfgInterpreter]: Interpreting procedure exists_runnable_thread with input of size 1 for LOIs [2023-12-02 16:30:11,951 INFO L197 IcfgInterpreter]: Interpreting procedure immediate_notify with input of size 58 for LOIs [2023-12-02 16:30:12,093 INFO L197 IcfgInterpreter]: Interpreting procedure activate_threads with input of size 1 for LOIs [2023-12-02 16:30:12,378 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 16:30:23,912 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '974897#(and (<= |ULTIMATE.start_eval_~tmp_ndt_1~0#1| 2147483647) (= |ULTIMATE.start_start_simulation_~kernel_st~0#1| 1) (<= |ULTIMATE.start_eval_~tmp~0#1| 1) (<= 0 (+ |ULTIMATE.start_eval_~tmp_ndt_1~0#1| 2147483648)) (not (= |ULTIMATE.start_eval_~tmp~0#1| 0)) (= ~m_pc~0 1) (not (= |ULTIMATE.start_eval_~tmp_ndt_1~0#1| 0)) (= ~m_st~0 1) (not (= ~token~0 (+ 8 ~local~0))) (<= 0 |ULTIMATE.start_eval_~tmp~0#1|))' at error location [2023-12-02 16:30:23,912 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 16:30:23,912 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 16:30:23,912 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 9 [2023-12-02 16:30:23,913 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [959140886] [2023-12-02 16:30:23,913 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 16:30:23,914 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2023-12-02 16:30:23,914 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:30:23,915 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2023-12-02 16:30:23,918 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=511, Invalid=5495, Unknown=0, NotChecked=0, Total=6006 [2023-12-02 16:30:23,919 INFO L87 Difference]: Start difference. First operand 93954 states and 127237 transitions. Second operand has 9 states, 9 states have (on average 21.22222222222222) internal successors, (191), 9 states have internal predecessors, (191), 5 states have call successors, (28), 6 states have call predecessors, (28), 7 states have return successors, (30), 6 states have call predecessors, (30), 5 states have call successors, (30) [2023-12-02 16:30:28,116 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:30:28,116 INFO L93 Difference]: Finished difference Result 241402 states and 326011 transitions. [2023-12-02 16:30:28,116 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2023-12-02 16:30:28,117 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 21.22222222222222) internal successors, (191), 9 states have internal predecessors, (191), 5 states have call successors, (28), 6 states have call predecessors, (28), 7 states have return successors, (30), 6 states have call predecessors, (30), 5 states have call successors, (30) Word has length 167 [2023-12-02 16:30:28,117 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:30:28,433 INFO L225 Difference]: With dead ends: 241402 [2023-12-02 16:30:28,433 INFO L226 Difference]: Without dead ends: 147454 [2023-12-02 16:30:28,586 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 522 GetRequests, 440 SyntacticMatches, 0 SemanticMatches, 82 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2403 ImplicationChecksByTransitivity, 11.7s TimeCoverageRelationStatistics Valid=572, Invalid=6400, Unknown=0, NotChecked=0, Total=6972 [2023-12-02 16:30:28,587 INFO L413 NwaCegarLoop]: 204 mSDtfsCounter, 566 mSDsluCounter, 631 mSDsCounter, 0 mSdLazyCounter, 352 mSolverCounterSat, 107 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 583 SdHoareTripleChecker+Valid, 835 SdHoareTripleChecker+Invalid, 459 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 107 IncrementalHoareTripleChecker+Valid, 352 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-12-02 16:30:28,587 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [583 Valid, 835 Invalid, 459 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [107 Valid, 352 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-12-02 16:30:28,691 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 147454 states. [2023-12-02 16:30:32,520 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 147454 to 139900. [2023-12-02 16:30:32,625 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 139900 states, 121599 states have (on average 1.3578976800796059) internal successors, (165119), 121984 states have internal predecessors, (165119), 11776 states have call successors, (11776), 6524 states have call predecessors, (11776), 6524 states have return successors, (11776), 11392 states have call predecessors, (11776), 11776 states have call successors, (11776) [2023-12-02 16:30:33,687 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 139900 states to 139900 states and 188671 transitions. [2023-12-02 16:30:33,692 INFO L78 Accepts]: Start accepts. Automaton has 139900 states and 188671 transitions. Word has length 167 [2023-12-02 16:30:33,692 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:30:33,693 INFO L495 AbstractCegarLoop]: Abstraction has 139900 states and 188671 transitions. [2023-12-02 16:30:33,693 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 21.22222222222222) internal successors, (191), 9 states have internal predecessors, (191), 5 states have call successors, (28), 6 states have call predecessors, (28), 7 states have return successors, (30), 6 states have call predecessors, (30), 5 states have call successors, (30) [2023-12-02 16:30:33,693 INFO L276 IsEmpty]: Start isEmpty. Operand 139900 states and 188671 transitions. [2023-12-02 16:30:33,883 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 172 [2023-12-02 16:30:33,883 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:30:33,884 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:30:33,890 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dbc2aff6-d1f5-4493-9e3f-648dd75d4178/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2023-12-02 16:30:34,084 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dbc2aff6-d1f5-4493-9e3f-648dd75d4178/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:30:34,084 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:30:34,085 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:30:34,085 INFO L85 PathProgramCache]: Analyzing trace with hash -1958723858, now seen corresponding path program 1 times [2023-12-02 16:30:34,085 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:30:34,085 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [978046602] [2023-12-02 16:30:34,085 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:30:34,085 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:30:34,108 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:30:34,313 INFO L134 CoverageAnalysis]: Checked inductivity of 122 backedges. 10 proven. 56 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2023-12-02 16:30:34,314 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:30:34,314 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [978046602] [2023-12-02 16:30:34,314 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [978046602] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:30:34,314 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [598798053] [2023-12-02 16:30:34,314 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:30:34,314 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:30:34,314 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dbc2aff6-d1f5-4493-9e3f-648dd75d4178/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:30:34,315 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dbc2aff6-d1f5-4493-9e3f-648dd75d4178/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:30:34,317 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dbc2aff6-d1f5-4493-9e3f-648dd75d4178/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-12-02 16:30:34,518 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:30:34,522 INFO L262 TraceCheckSpWp]: Trace formula consists of 930 conjuncts, 3 conjunts are in the unsatisfiable core [2023-12-02 16:30:34,525 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:30:34,576 INFO L134 CoverageAnalysis]: Checked inductivity of 122 backedges. 117 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2023-12-02 16:30:34,576 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 16:30:34,577 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [598798053] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:30:34,577 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 16:30:34,577 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2023-12-02 16:30:34,577 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1214429376] [2023-12-02 16:30:34,577 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:30:34,578 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 16:30:34,578 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:30:34,578 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 16:30:34,579 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-12-02 16:30:34,579 INFO L87 Difference]: Start difference. First operand 139900 states and 188671 transitions. Second operand has 3 states, 3 states have (on average 48.666666666666664) internal successors, (146), 3 states have internal predecessors, (146), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2023-12-02 16:30:38,086 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:30:38,086 INFO L93 Difference]: Finished difference Result 211584 states and 289857 transitions. [2023-12-02 16:30:38,087 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 16:30:38,087 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 48.666666666666664) internal successors, (146), 3 states have internal predecessors, (146), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) Word has length 171 [2023-12-02 16:30:38,087 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:30:38,477 INFO L225 Difference]: With dead ends: 211584 [2023-12-02 16:30:38,477 INFO L226 Difference]: Without dead ends: 140286 [2023-12-02 16:30:38,559 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 178 GetRequests, 173 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-12-02 16:30:38,560 INFO L413 NwaCegarLoop]: 346 mSDtfsCounter, 169 mSDsluCounter, 176 mSDsCounter, 0 mSdLazyCounter, 104 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 169 SdHoareTripleChecker+Valid, 522 SdHoareTripleChecker+Invalid, 106 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 104 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 16:30:38,560 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [169 Valid, 522 Invalid, 106 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 104 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 16:30:38,657 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 140286 states. [2023-12-02 16:30:42,877 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 140286 to 139516. [2023-12-02 16:30:42,954 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 139516 states, 121215 states have (on average 1.3431918491935817) internal successors, (162815), 121600 states have internal predecessors, (162815), 11776 states have call successors, (11776), 6524 states have call predecessors, (11776), 6524 states have return successors, (11776), 11392 states have call predecessors, (11776), 11776 states have call successors, (11776) [2023-12-02 16:30:43,520 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 139516 states to 139516 states and 186367 transitions. [2023-12-02 16:30:43,526 INFO L78 Accepts]: Start accepts. Automaton has 139516 states and 186367 transitions. Word has length 171 [2023-12-02 16:30:43,526 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:30:43,526 INFO L495 AbstractCegarLoop]: Abstraction has 139516 states and 186367 transitions. [2023-12-02 16:30:43,526 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 48.666666666666664) internal successors, (146), 3 states have internal predecessors, (146), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2023-12-02 16:30:43,527 INFO L276 IsEmpty]: Start isEmpty. Operand 139516 states and 186367 transitions. [2023-12-02 16:30:43,764 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 172 [2023-12-02 16:30:43,764 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:30:43,764 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:30:43,770 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dbc2aff6-d1f5-4493-9e3f-648dd75d4178/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Ended with exit code 0 [2023-12-02 16:30:43,965 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dbc2aff6-d1f5-4493-9e3f-648dd75d4178/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:30:43,966 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:30:43,967 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:30:43,968 INFO L85 PathProgramCache]: Analyzing trace with hash -2122863764, now seen corresponding path program 1 times [2023-12-02 16:30:43,968 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:30:43,969 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [961020776] [2023-12-02 16:30:43,969 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:30:43,969 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:30:44,002 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:30:44,526 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 10 proven. 54 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2023-12-02 16:30:44,527 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:30:44,527 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [961020776] [2023-12-02 16:30:44,527 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [961020776] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:30:44,527 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1727306934] [2023-12-02 16:30:44,527 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:30:44,527 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:30:44,527 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dbc2aff6-d1f5-4493-9e3f-648dd75d4178/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:30:44,528 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dbc2aff6-d1f5-4493-9e3f-648dd75d4178/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:30:44,529 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dbc2aff6-d1f5-4493-9e3f-648dd75d4178/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2023-12-02 16:30:44,723 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:30:44,726 INFO L262 TraceCheckSpWp]: Trace formula consists of 936 conjuncts, 5 conjunts are in the unsatisfiable core [2023-12-02 16:30:44,729 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:30:44,776 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 108 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-12-02 16:30:44,776 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 16:30:44,776 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1727306934] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:30:44,776 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 16:30:44,777 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [6] total 8 [2023-12-02 16:30:44,777 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [509868841] [2023-12-02 16:30:44,777 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:30:44,777 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-12-02 16:30:44,778 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:30:44,778 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-12-02 16:30:44,778 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2023-12-02 16:30:44,779 INFO L87 Difference]: Start difference. First operand 139516 states and 186367 transitions. Second operand has 4 states, 4 states have (on average 35.25) internal successors, (141), 4 states have internal predecessors, (141), 2 states have call successors, (10), 2 states have call predecessors, (10), 3 states have return successors, (10), 3 states have call predecessors, (10), 2 states have call successors, (10) [2023-12-02 16:30:48,561 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:30:48,561 INFO L93 Difference]: Finished difference Result 200929 states and 268777 transitions. [2023-12-02 16:30:48,562 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-12-02 16:30:48,562 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 35.25) internal successors, (141), 4 states have internal predecessors, (141), 2 states have call successors, (10), 2 states have call predecessors, (10), 3 states have return successors, (10), 3 states have call predecessors, (10), 2 states have call successors, (10) Word has length 171 [2023-12-02 16:30:48,562 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:30:48,987 INFO L225 Difference]: With dead ends: 200929 [2023-12-02 16:30:48,987 INFO L226 Difference]: Without dead ends: 147682 [2023-12-02 16:30:49,065 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 179 GetRequests, 172 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=54, Unknown=0, NotChecked=0, Total=72 [2023-12-02 16:30:49,065 INFO L413 NwaCegarLoop]: 265 mSDtfsCounter, 174 mSDsluCounter, 440 mSDsCounter, 0 mSdLazyCounter, 156 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 174 SdHoareTripleChecker+Valid, 705 SdHoareTripleChecker+Invalid, 159 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 156 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 16:30:49,065 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [174 Valid, 705 Invalid, 159 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 156 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 16:30:49,179 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 147682 states. [2023-12-02 16:30:54,118 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 147682 to 146869. [2023-12-02 16:30:54,196 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 146869 states, 128043 states have (on average 1.3379021110095828) internal successors, (171309), 128684 states have internal predecessors, (171309), 11784 states have call successors, (11784), 6529 states have call predecessors, (11784), 7041 states have return successors, (12296), 11656 states have call predecessors, (12296), 11784 states have call successors, (12296) [2023-12-02 16:30:54,806 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 146869 states to 146869 states and 195389 transitions. [2023-12-02 16:30:54,809 INFO L78 Accepts]: Start accepts. Automaton has 146869 states and 195389 transitions. Word has length 171 [2023-12-02 16:30:54,810 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:30:54,810 INFO L495 AbstractCegarLoop]: Abstraction has 146869 states and 195389 transitions. [2023-12-02 16:30:54,810 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 35.25) internal successors, (141), 4 states have internal predecessors, (141), 2 states have call successors, (10), 2 states have call predecessors, (10), 3 states have return successors, (10), 3 states have call predecessors, (10), 2 states have call successors, (10) [2023-12-02 16:30:54,810 INFO L276 IsEmpty]: Start isEmpty. Operand 146869 states and 195389 transitions. [2023-12-02 16:30:55,033 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 172 [2023-12-02 16:30:55,034 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:30:55,034 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:30:55,040 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dbc2aff6-d1f5-4493-9e3f-648dd75d4178/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Ended with exit code 0 [2023-12-02 16:30:55,234 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dbc2aff6-d1f5-4493-9e3f-648dd75d4178/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:30:55,235 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:30:55,235 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:30:55,235 INFO L85 PathProgramCache]: Analyzing trace with hash -1648218194, now seen corresponding path program 1 times [2023-12-02 16:30:55,235 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:30:55,235 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [128149177] [2023-12-02 16:30:55,235 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:30:55,235 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:30:55,255 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:30:55,576 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 14 proven. 57 refuted. 0 times theorem prover too weak. 50 trivial. 0 not checked. [2023-12-02 16:30:55,576 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:30:55,576 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [128149177] [2023-12-02 16:30:55,576 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [128149177] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:30:55,576 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1529966085] [2023-12-02 16:30:55,577 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:30:55,577 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:30:55,577 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dbc2aff6-d1f5-4493-9e3f-648dd75d4178/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:30:55,578 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dbc2aff6-d1f5-4493-9e3f-648dd75d4178/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:30:55,596 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dbc2aff6-d1f5-4493-9e3f-648dd75d4178/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2023-12-02 16:30:55,783 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:30:55,786 INFO L262 TraceCheckSpWp]: Trace formula consists of 930 conjuncts, 2 conjunts are in the unsatisfiable core [2023-12-02 16:30:55,789 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:30:55,810 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 92 proven. 0 refuted. 0 times theorem prover too weak. 29 trivial. 0 not checked. [2023-12-02 16:30:55,810 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 16:30:55,811 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1529966085] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:30:55,811 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 16:30:55,811 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2023-12-02 16:30:55,811 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [428465915] [2023-12-02 16:30:55,811 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:30:55,811 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 16:30:55,811 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:30:55,812 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 16:30:55,812 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-12-02 16:30:55,812 INFO L87 Difference]: Start difference. First operand 146869 states and 195389 transitions. Second operand has 3 states, 3 states have (on average 40.333333333333336) internal successors, (121), 3 states have internal predecessors, (121), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2023-12-02 16:31:01,177 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:31:01,177 INFO L93 Difference]: Finished difference Result 283701 states and 381303 transitions. [2023-12-02 16:31:01,177 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 16:31:01,177 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 40.333333333333336) internal successors, (121), 3 states have internal predecessors, (121), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) Word has length 171 [2023-12-02 16:31:01,178 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:31:02,035 INFO L225 Difference]: With dead ends: 283701 [2023-12-02 16:31:02,035 INFO L226 Difference]: Without dead ends: 209267 [2023-12-02 16:31:02,270 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 184 GetRequests, 179 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-12-02 16:31:02,271 INFO L413 NwaCegarLoop]: 322 mSDtfsCounter, 146 mSDsluCounter, 192 mSDsCounter, 0 mSdLazyCounter, 100 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 146 SdHoareTripleChecker+Valid, 514 SdHoareTripleChecker+Invalid, 100 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 100 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 16:31:02,271 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [146 Valid, 514 Invalid, 100 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 100 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 16:31:02,431 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 209267 states. [2023-12-02 16:31:08,282 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 209267 to 173173. [2023-12-02 16:31:08,356 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 173173 states, 153195 states have (on average 1.3701556839322433) internal successors, (209901), 153836 states have internal predecessors, (209901), 12360 states have call successors, (12360), 7105 states have call predecessors, (12360), 7617 states have return successors, (12872), 12232 states have call predecessors, (12872), 12360 states have call successors, (12872) [2023-12-02 16:31:08,754 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 173173 states to 173173 states and 235133 transitions. [2023-12-02 16:31:08,759 INFO L78 Accepts]: Start accepts. Automaton has 173173 states and 235133 transitions. Word has length 171 [2023-12-02 16:31:08,759 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:31:08,759 INFO L495 AbstractCegarLoop]: Abstraction has 173173 states and 235133 transitions. [2023-12-02 16:31:08,759 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 40.333333333333336) internal successors, (121), 3 states have internal predecessors, (121), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2023-12-02 16:31:08,759 INFO L276 IsEmpty]: Start isEmpty. Operand 173173 states and 235133 transitions. [2023-12-02 16:31:08,976 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 173 [2023-12-02 16:31:08,976 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:31:08,977 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:31:08,982 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dbc2aff6-d1f5-4493-9e3f-648dd75d4178/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Ended with exit code 0 [2023-12-02 16:31:09,177 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dbc2aff6-d1f5-4493-9e3f-648dd75d4178/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:31:09,177 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:31:09,177 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:31:09,177 INFO L85 PathProgramCache]: Analyzing trace with hash -1011709991, now seen corresponding path program 2 times [2023-12-02 16:31:09,178 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:31:09,178 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [874642384] [2023-12-02 16:31:09,178 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:31:09,178 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:31:09,199 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:31:09,638 INFO L134 CoverageAnalysis]: Checked inductivity of 122 backedges. 10 proven. 55 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2023-12-02 16:31:09,639 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:31:09,639 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [874642384] [2023-12-02 16:31:09,639 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [874642384] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:31:09,639 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2076335872] [2023-12-02 16:31:09,639 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 16:31:09,639 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:31:09,639 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dbc2aff6-d1f5-4493-9e3f-648dd75d4178/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:31:09,640 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dbc2aff6-d1f5-4493-9e3f-648dd75d4178/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:31:09,640 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dbc2aff6-d1f5-4493-9e3f-648dd75d4178/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2023-12-02 16:31:09,830 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-12-02 16:31:09,830 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 16:31:09,833 INFO L262 TraceCheckSpWp]: Trace formula consists of 886 conjuncts, 3 conjunts are in the unsatisfiable core [2023-12-02 16:31:09,836 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:31:09,853 INFO L134 CoverageAnalysis]: Checked inductivity of 122 backedges. 89 proven. 0 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2023-12-02 16:31:09,853 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 16:31:09,853 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2076335872] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:31:09,853 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 16:31:09,854 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2023-12-02 16:31:09,854 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [599429188] [2023-12-02 16:31:09,854 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:31:09,855 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 16:31:09,855 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:31:09,855 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 16:31:09,856 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-12-02 16:31:09,856 INFO L87 Difference]: Start difference. First operand 173173 states and 235133 transitions. Second operand has 3 states, 3 states have (on average 40.666666666666664) internal successors, (122), 3 states have internal predecessors, (122), 3 states have call successors, (10), 3 states have call predecessors, (10), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) [2023-12-02 16:31:14,482 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:31:14,482 INFO L93 Difference]: Finished difference Result 240692 states and 329083 transitions. [2023-12-02 16:31:14,483 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 16:31:14,483 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 40.666666666666664) internal successors, (122), 3 states have internal predecessors, (122), 3 states have call successors, (10), 3 states have call predecessors, (10), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) Word has length 172 [2023-12-02 16:31:14,483 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:31:14,836 INFO L225 Difference]: With dead ends: 240692 [2023-12-02 16:31:14,836 INFO L226 Difference]: Without dead ends: 164981 [2023-12-02 16:31:14,931 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 179 GetRequests, 174 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-12-02 16:31:14,931 INFO L413 NwaCegarLoop]: 206 mSDtfsCounter, 52 mSDsluCounter, 180 mSDsCounter, 0 mSdLazyCounter, 81 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 52 SdHoareTripleChecker+Valid, 386 SdHoareTripleChecker+Invalid, 81 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 81 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 16:31:14,932 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [52 Valid, 386 Invalid, 81 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 81 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 16:31:15,059 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 164981 states. [2023-12-02 16:31:19,963 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 164981 to 154741. [2023-12-02 16:31:20,035 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 154741 states, 136299 states have (on average 1.3859896257492719) internal successors, (188909), 136556 states have internal predecessors, (188909), 11848 states have call successors, (11848), 6593 states have call predecessors, (11848), 6593 states have return successors, (11848), 11592 states have call predecessors, (11848), 11848 states have call successors, (11848) [2023-12-02 16:31:20,570 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 154741 states to 154741 states and 212605 transitions. [2023-12-02 16:31:20,573 INFO L78 Accepts]: Start accepts. Automaton has 154741 states and 212605 transitions. Word has length 172 [2023-12-02 16:31:20,573 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:31:20,573 INFO L495 AbstractCegarLoop]: Abstraction has 154741 states and 212605 transitions. [2023-12-02 16:31:20,573 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 40.666666666666664) internal successors, (122), 3 states have internal predecessors, (122), 3 states have call successors, (10), 3 states have call predecessors, (10), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) [2023-12-02 16:31:20,573 INFO L276 IsEmpty]: Start isEmpty. Operand 154741 states and 212605 transitions. [2023-12-02 16:31:20,761 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 174 [2023-12-02 16:31:20,761 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:31:20,762 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:31:20,767 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dbc2aff6-d1f5-4493-9e3f-648dd75d4178/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2023-12-02 16:31:20,962 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dbc2aff6-d1f5-4493-9e3f-648dd75d4178/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2023-12-02 16:31:20,962 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:31:20,962 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:31:20,963 INFO L85 PathProgramCache]: Analyzing trace with hash -202568720, now seen corresponding path program 1 times [2023-12-02 16:31:20,963 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:31:20,963 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1447246228] [2023-12-02 16:31:20,963 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:31:20,963 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:31:20,979 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:31:21,150 INFO L134 CoverageAnalysis]: Checked inductivity of 123 backedges. 10 proven. 55 refuted. 0 times theorem prover too weak. 58 trivial. 0 not checked. [2023-12-02 16:31:21,150 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:31:21,150 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1447246228] [2023-12-02 16:31:21,151 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1447246228] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:31:21,151 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [276796608] [2023-12-02 16:31:21,151 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:31:21,151 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:31:21,151 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dbc2aff6-d1f5-4493-9e3f-648dd75d4178/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:31:21,152 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dbc2aff6-d1f5-4493-9e3f-648dd75d4178/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:31:21,154 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dbc2aff6-d1f5-4493-9e3f-648dd75d4178/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2023-12-02 16:31:21,306 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:31:21,309 INFO L262 TraceCheckSpWp]: Trace formula consists of 939 conjuncts, 3 conjunts are in the unsatisfiable core [2023-12-02 16:31:21,312 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:31:21,341 INFO L134 CoverageAnalysis]: Checked inductivity of 123 backedges. 90 proven. 0 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2023-12-02 16:31:21,341 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 16:31:21,341 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [276796608] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:31:21,341 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 16:31:21,341 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2023-12-02 16:31:21,341 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1031847208] [2023-12-02 16:31:21,342 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:31:21,342 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 16:31:21,342 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:31:21,342 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 16:31:21,343 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-12-02 16:31:21,343 INFO L87 Difference]: Start difference. First operand 154741 states and 212605 transitions. Second operand has 3 states, 3 states have (on average 41.333333333333336) internal successors, (124), 3 states have internal predecessors, (124), 3 states have call successors, (10), 3 states have call predecessors, (10), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2023-12-02 16:31:28,911 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:31:28,911 INFO L93 Difference]: Finished difference Result 377383 states and 525994 transitions. [2023-12-02 16:31:28,912 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 16:31:28,912 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 41.333333333333336) internal successors, (124), 3 states have internal predecessors, (124), 3 states have call successors, (10), 3 states have call predecessors, (10), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) Word has length 173 [2023-12-02 16:31:28,912 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:31:29,426 INFO L225 Difference]: With dead ends: 377383 [2023-12-02 16:31:29,426 INFO L226 Difference]: Without dead ends: 222705 [2023-12-02 16:31:29,571 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 180 GetRequests, 175 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-12-02 16:31:29,572 INFO L413 NwaCegarLoop]: 203 mSDtfsCounter, 99 mSDsluCounter, 173 mSDsCounter, 0 mSdLazyCounter, 76 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 99 SdHoareTripleChecker+Valid, 376 SdHoareTripleChecker+Invalid, 78 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 76 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 16:31:29,572 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [99 Valid, 376 Invalid, 78 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 76 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 16:31:29,725 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 222705 states. [2023-12-02 16:31:36,107 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 222705 to 181049. [2023-12-02 16:31:36,332 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 181049 states, 161453 states have (on average 1.4090973843781163) internal successors, (227503), 161711 states have internal predecessors, (227503), 12425 states have call successors, (12425), 7170 states have call predecessors, (12425), 7170 states have return successors, (12425), 12168 states have call predecessors, (12425), 12425 states have call successors, (12425) [2023-12-02 16:31:36,816 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 181049 states to 181049 states and 252353 transitions. [2023-12-02 16:31:36,827 INFO L78 Accepts]: Start accepts. Automaton has 181049 states and 252353 transitions. Word has length 173 [2023-12-02 16:31:36,827 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:31:36,827 INFO L495 AbstractCegarLoop]: Abstraction has 181049 states and 252353 transitions. [2023-12-02 16:31:36,827 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 41.333333333333336) internal successors, (124), 3 states have internal predecessors, (124), 3 states have call successors, (10), 3 states have call predecessors, (10), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2023-12-02 16:31:36,828 INFO L276 IsEmpty]: Start isEmpty. Operand 181049 states and 252353 transitions. [2023-12-02 16:31:37,102 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 176 [2023-12-02 16:31:37,103 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:31:37,103 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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] [2023-12-02 16:31:37,109 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dbc2aff6-d1f5-4493-9e3f-648dd75d4178/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2023-12-02 16:31:37,303 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dbc2aff6-d1f5-4493-9e3f-648dd75d4178/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2023-12-02 16:31:37,303 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:31:37,304 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:31:37,304 INFO L85 PathProgramCache]: Analyzing trace with hash -1014746495, now seen corresponding path program 1 times [2023-12-02 16:31:37,304 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:31:37,304 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2143364179] [2023-12-02 16:31:37,304 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:31:37,304 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:31:37,323 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:31:37,490 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 17 proven. 55 refuted. 0 times theorem prover too weak. 54 trivial. 0 not checked. [2023-12-02 16:31:37,490 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:31:37,491 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2143364179] [2023-12-02 16:31:37,491 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2143364179] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:31:37,491 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [882657431] [2023-12-02 16:31:37,491 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:31:37,491 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:31:37,491 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dbc2aff6-d1f5-4493-9e3f-648dd75d4178/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:31:37,492 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dbc2aff6-d1f5-4493-9e3f-648dd75d4178/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:31:37,493 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dbc2aff6-d1f5-4493-9e3f-648dd75d4178/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2023-12-02 16:31:37,682 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:31:37,687 INFO L262 TraceCheckSpWp]: Trace formula consists of 945 conjuncts, 9 conjunts are in the unsatisfiable core [2023-12-02 16:31:37,690 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:31:37,800 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 78 proven. 0 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2023-12-02 16:31:37,801 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 16:31:37,801 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [882657431] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:31:37,801 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 16:31:37,801 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [6] total 10 [2023-12-02 16:31:37,801 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [929962656] [2023-12-02 16:31:37,801 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:31:37,802 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-12-02 16:31:37,802 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:31:37,803 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-12-02 16:31:37,803 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=70, Unknown=0, NotChecked=0, Total=90 [2023-12-02 16:31:37,803 INFO L87 Difference]: Start difference. First operand 181049 states and 252353 transitions. Second operand has 6 states, 6 states have (on average 19.0) internal successors, (114), 5 states have internal predecessors, (114), 3 states have call successors, (9), 4 states have call predecessors, (9), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2023-12-02 16:31:47,401 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:31:47,402 INFO L93 Difference]: Finished difference Result 449001 states and 625391 transitions. [2023-12-02 16:31:47,402 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-12-02 16:31:47,402 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 19.0) internal successors, (114), 5 states have internal predecessors, (114), 3 states have call successors, (9), 4 states have call predecessors, (9), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 175 [2023-12-02 16:31:47,403 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:31:48,099 INFO L225 Difference]: With dead ends: 449001 [2023-12-02 16:31:48,100 INFO L226 Difference]: Without dead ends: 268015 [2023-12-02 16:31:48,285 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 186 GetRequests, 174 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=45, Invalid=137, Unknown=0, NotChecked=0, Total=182 [2023-12-02 16:31:48,286 INFO L413 NwaCegarLoop]: 171 mSDtfsCounter, 588 mSDsluCounter, 349 mSDsCounter, 0 mSdLazyCounter, 205 mSolverCounterSat, 132 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 605 SdHoareTripleChecker+Valid, 520 SdHoareTripleChecker+Invalid, 337 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 132 IncrementalHoareTripleChecker+Valid, 205 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-12-02 16:31:48,286 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [605 Valid, 520 Invalid, 337 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [132 Valid, 205 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-12-02 16:31:48,499 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 268015 states. [2023-12-02 16:31:58,412 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 268015 to 268013. [2023-12-02 16:31:58,559 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 268013 states, 238825 states have (on average 1.3982246414738826) internal successors, (333931), 239211 states have internal predecessors, (333931), 18437 states have call successors, (18437), 10750 states have call predecessors, (18437), 10750 states have return successors, (18437), 18052 states have call predecessors, (18437), 18437 states have call successors, (18437) [2023-12-02 16:31:59,320 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 268013 states to 268013 states and 370805 transitions. [2023-12-02 16:31:59,328 INFO L78 Accepts]: Start accepts. Automaton has 268013 states and 370805 transitions. Word has length 175 [2023-12-02 16:31:59,329 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:31:59,329 INFO L495 AbstractCegarLoop]: Abstraction has 268013 states and 370805 transitions. [2023-12-02 16:31:59,329 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 19.0) internal successors, (114), 5 states have internal predecessors, (114), 3 states have call successors, (9), 4 states have call predecessors, (9), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2023-12-02 16:31:59,329 INFO L276 IsEmpty]: Start isEmpty. Operand 268013 states and 370805 transitions. [2023-12-02 16:32:00,099 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 180 [2023-12-02 16:32:00,099 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:32:00,099 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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] [2023-12-02 16:32:00,104 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dbc2aff6-d1f5-4493-9e3f-648dd75d4178/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Ended with exit code 0 [2023-12-02 16:32:00,300 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dbc2aff6-d1f5-4493-9e3f-648dd75d4178/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:32:00,300 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:32:00,300 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:32:00,300 INFO L85 PathProgramCache]: Analyzing trace with hash 1466742071, now seen corresponding path program 1 times [2023-12-02 16:32:00,300 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:32:00,300 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [882475423] [2023-12-02 16:32:00,301 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:32:00,301 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:32:00,318 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:32:00,483 INFO L134 CoverageAnalysis]: Checked inductivity of 128 backedges. 17 proven. 55 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2023-12-02 16:32:00,483 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:32:00,483 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [882475423] [2023-12-02 16:32:00,483 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [882475423] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:32:00,484 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1418144679] [2023-12-02 16:32:00,484 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:32:00,484 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:32:00,484 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dbc2aff6-d1f5-4493-9e3f-648dd75d4178/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:32:00,485 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dbc2aff6-d1f5-4493-9e3f-648dd75d4178/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:32:00,487 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dbc2aff6-d1f5-4493-9e3f-648dd75d4178/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2023-12-02 16:32:00,688 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:32:00,691 INFO L262 TraceCheckSpWp]: Trace formula consists of 957 conjuncts, 9 conjunts are in the unsatisfiable core [2023-12-02 16:32:00,695 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:32:00,770 INFO L134 CoverageAnalysis]: Checked inductivity of 128 backedges. 81 proven. 0 refuted. 0 times theorem prover too weak. 47 trivial. 0 not checked. [2023-12-02 16:32:00,771 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 16:32:00,771 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1418144679] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:32:00,771 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 16:32:00,771 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [6] total 10 [2023-12-02 16:32:00,771 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1790623322] [2023-12-02 16:32:00,771 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:32:00,772 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-12-02 16:32:00,772 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:32:00,772 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-12-02 16:32:00,772 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=70, Unknown=0, NotChecked=0, Total=90 [2023-12-02 16:32:00,773 INFO L87 Difference]: Start difference. First operand 268013 states and 370805 transitions. Second operand has 6 states, 6 states have (on average 19.833333333333332) internal successors, (119), 5 states have internal predecessors, (119), 3 states have call successors, (9), 4 states have call predecessors, (9), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9)