./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/combinations/Problem05_label49+token_ring.03.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_7cefd2f5-a2d9-4289-9d32-123615026949/bin/utaipan-verify-SwPr7d2a91/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7cefd2f5-a2d9-4289-9d32-123615026949/bin/utaipan-verify-SwPr7d2a91/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7cefd2f5-a2d9-4289-9d32-123615026949/bin/utaipan-verify-SwPr7d2a91/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7cefd2f5-a2d9-4289-9d32-123615026949/bin/utaipan-verify-SwPr7d2a91/config/TaipanReach.xml -i ../../sv-benchmarks/c/combinations/Problem05_label49+token_ring.03.cil-1.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7cefd2f5-a2d9-4289-9d32-123615026949/bin/utaipan-verify-SwPr7d2a91/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7cefd2f5-a2d9-4289-9d32-123615026949/bin/utaipan-verify-SwPr7d2a91 --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 45212159197fe0bc553796025c4b5584a047c150b6d840572b407bf4bd1f9446 --- Real Ultimate output --- This is Ultimate 0.2.4-dev-0e0057c [2023-11-25 00:02:53,064 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-25 00:02:53,149 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7cefd2f5-a2d9-4289-9d32-123615026949/bin/utaipan-verify-SwPr7d2a91/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-11-25 00:02:53,156 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-25 00:02:53,156 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-25 00:02:53,198 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-25 00:02:53,199 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-25 00:02:53,199 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-25 00:02:53,200 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-25 00:02:53,201 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-25 00:02:53,202 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-25 00:02:53,202 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-25 00:02:53,203 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-25 00:02:53,203 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-25 00:02:53,204 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-25 00:02:53,205 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-25 00:02:53,205 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-25 00:02:53,206 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-25 00:02:53,206 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-25 00:02:53,207 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-25 00:02:53,207 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-25 00:02:53,208 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-25 00:02:53,209 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-25 00:02:53,209 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-11-25 00:02:53,210 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-25 00:02:53,210 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-25 00:02:53,211 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-25 00:02:53,211 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-25 00:02:53,211 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-11-25 00:02:53,212 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-25 00:02:53,212 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-11-25 00:02:53,213 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-25 00:02:53,213 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-11-25 00:02:53,213 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-25 00:02:53,214 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-25 00:02:53,214 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-11-25 00:02:53,215 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-25 00:02:53,226 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-25 00:02:53,227 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-25 00:02:53,227 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-25 00:02:53,227 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-11-25 00:02:53,228 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-25 00:02:53,229 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-25 00:02:53,229 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-11-25 00:02:53,229 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-11-25 00:02:53,229 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-25 00:02:53,230 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-25 00:02:53,230 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_7cefd2f5-a2d9-4289-9d32-123615026949/bin/utaipan-verify-SwPr7d2a91/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7cefd2f5-a2d9-4289-9d32-123615026949/bin/utaipan-verify-SwPr7d2a91 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 45212159197fe0bc553796025c4b5584a047c150b6d840572b407bf4bd1f9446 [2023-11-25 00:02:53,512 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-25 00:02:53,547 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-25 00:02:53,550 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-25 00:02:53,552 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-25 00:02:53,553 INFO L274 PluginConnector]: CDTParser initialized [2023-11-25 00:02:53,554 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7cefd2f5-a2d9-4289-9d32-123615026949/bin/utaipan-verify-SwPr7d2a91/../../sv-benchmarks/c/combinations/Problem05_label49+token_ring.03.cil-1.c [2023-11-25 00:02:56,610 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-25 00:02:57,346 INFO L384 CDTParser]: Found 1 translation units. [2023-11-25 00:02:57,347 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7cefd2f5-a2d9-4289-9d32-123615026949/sv-benchmarks/c/combinations/Problem05_label49+token_ring.03.cil-1.c [2023-11-25 00:02:57,398 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7cefd2f5-a2d9-4289-9d32-123615026949/bin/utaipan-verify-SwPr7d2a91/data/8dc69ad12/c4a4ff1e11394590a37348ea39572868/FLAG5c7e976e4 [2023-11-25 00:02:57,413 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7cefd2f5-a2d9-4289-9d32-123615026949/bin/utaipan-verify-SwPr7d2a91/data/8dc69ad12/c4a4ff1e11394590a37348ea39572868 [2023-11-25 00:02:57,417 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-25 00:02:57,418 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-25 00:02:57,420 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-25 00:02:57,420 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-25 00:02:57,426 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-25 00:02:57,427 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 12:02:57" (1/1) ... [2023-11-25 00:02:57,428 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@9f1e19b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 12:02:57, skipping insertion in model container [2023-11-25 00:02:57,428 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 12:02:57" (1/1) ... [2023-11-25 00:02:57,717 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-25 00:03:00,209 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_7cefd2f5-a2d9-4289-9d32-123615026949/sv-benchmarks/c/combinations/Problem05_label49+token_ring.03.cil-1.c[380593,380606] [2023-11-25 00:03:00,244 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_7cefd2f5-a2d9-4289-9d32-123615026949/sv-benchmarks/c/combinations/Problem05_label49+token_ring.03.cil-1.c[383339,383352] [2023-11-25 00:03:00,483 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-25 00:03:00,495 INFO L202 MainTranslator]: Completed pre-run [2023-11-25 00:03:01,658 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_7cefd2f5-a2d9-4289-9d32-123615026949/sv-benchmarks/c/combinations/Problem05_label49+token_ring.03.cil-1.c[380593,380606] [2023-11-25 00:03:01,666 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_7cefd2f5-a2d9-4289-9d32-123615026949/sv-benchmarks/c/combinations/Problem05_label49+token_ring.03.cil-1.c[383339,383352] [2023-11-25 00:03:01,678 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-25 00:03:01,763 INFO L206 MainTranslator]: Completed translation [2023-11-25 00:03:01,763 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 12:03:01 WrapperNode [2023-11-25 00:03:01,764 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-25 00:03:01,765 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-25 00:03:01,765 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-25 00:03:01,765 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-25 00:03:01,773 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 12:03:01" (1/1) ... [2023-11-25 00:03:01,860 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 12:03:01" (1/1) ... [2023-11-25 00:03:02,344 INFO L138 Inliner]: procedures = 50, calls = 51, calls flagged for inlining = 27, calls inlined = 27, statements flattened = 12694 [2023-11-25 00:03:02,348 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-25 00:03:02,349 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-25 00:03:02,349 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-25 00:03:02,349 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-25 00:03:02,360 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 12:03:01" (1/1) ... [2023-11-25 00:03:02,360 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 12:03:01" (1/1) ... [2023-11-25 00:03:02,419 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 12:03:01" (1/1) ... [2023-11-25 00:03:02,420 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 12:03:01" (1/1) ... [2023-11-25 00:03:02,664 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 12:03:01" (1/1) ... [2023-11-25 00:03:02,719 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 12:03:01" (1/1) ... [2023-11-25 00:03:02,739 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 12:03:01" (1/1) ... [2023-11-25 00:03:02,766 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 12:03:01" (1/1) ... [2023-11-25 00:03:02,824 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-25 00:03:02,826 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-25 00:03:02,826 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-25 00:03:02,826 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-25 00:03:02,827 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 12:03:01" (1/1) ... [2023-11-25 00:03:02,833 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-25 00:03:02,845 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7cefd2f5-a2d9-4289-9d32-123615026949/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-25 00:03:02,865 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7cefd2f5-a2d9-4289-9d32-123615026949/bin/utaipan-verify-SwPr7d2a91/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-25 00:03:02,867 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7cefd2f5-a2d9-4289-9d32-123615026949/bin/utaipan-verify-SwPr7d2a91/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-25 00:03:02,897 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-25 00:03:02,898 INFO L130 BoogieDeclarations]: Found specification of procedure activate_threads [2023-11-25 00:03:02,898 INFO L138 BoogieDeclarations]: Found implementation of procedure activate_threads [2023-11-25 00:03:02,898 INFO L130 BoogieDeclarations]: Found specification of procedure immediate_notify [2023-11-25 00:03:02,898 INFO L138 BoogieDeclarations]: Found implementation of procedure immediate_notify [2023-11-25 00:03:02,899 INFO L130 BoogieDeclarations]: Found specification of procedure update_channels [2023-11-25 00:03:02,899 INFO L138 BoogieDeclarations]: Found implementation of procedure update_channels [2023-11-25 00:03:02,899 INFO L130 BoogieDeclarations]: Found specification of procedure error [2023-11-25 00:03:02,899 INFO L138 BoogieDeclarations]: Found implementation of procedure error [2023-11-25 00:03:02,899 INFO L130 BoogieDeclarations]: Found specification of procedure fire_delta_events [2023-11-25 00:03:02,900 INFO L138 BoogieDeclarations]: Found implementation of procedure fire_delta_events [2023-11-25 00:03:02,900 INFO L130 BoogieDeclarations]: Found specification of procedure exists_runnable_thread [2023-11-25 00:03:02,900 INFO L138 BoogieDeclarations]: Found implementation of procedure exists_runnable_thread [2023-11-25 00:03:02,900 INFO L130 BoogieDeclarations]: Found specification of procedure reset_delta_events [2023-11-25 00:03:02,901 INFO L138 BoogieDeclarations]: Found implementation of procedure reset_delta_events [2023-11-25 00:03:02,901 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-25 00:03:02,901 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-25 00:03:02,901 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-25 00:03:03,030 INFO L241 CfgBuilder]: Building ICFG [2023-11-25 00:03:03,032 INFO L267 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-25 00:03:12,783 INFO L282 CfgBuilder]: Performing block encoding [2023-11-25 00:03:15,269 INFO L304 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-25 00:03:15,269 INFO L309 CfgBuilder]: Removed 7 assume(true) statements. [2023-11-25 00:03:15,272 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 12:03:15 BoogieIcfgContainer [2023-11-25 00:03:15,272 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-25 00:03:15,274 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-25 00:03:15,275 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-25 00:03:15,278 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-25 00:03:15,279 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 25.11 12:02:57" (1/3) ... [2023-11-25 00:03:15,279 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@35570699 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 12:03:15, skipping insertion in model container [2023-11-25 00:03:15,280 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 12:03:01" (2/3) ... [2023-11-25 00:03:15,280 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@35570699 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 12:03:15, skipping insertion in model container [2023-11-25 00:03:15,280 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 12:03:15" (3/3) ... [2023-11-25 00:03:15,282 INFO L112 eAbstractionObserver]: Analyzing ICFG Problem05_label49+token_ring.03.cil-1.c [2023-11-25 00:03:15,304 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-25 00:03:15,304 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 2 error locations. [2023-11-25 00:03:15,398 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-25 00:03:15,406 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;@32a6fa25, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-25 00:03:15,406 INFO L358 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2023-11-25 00:03:15,421 INFO L276 IsEmpty]: Start isEmpty. Operand has 1742 states, 1713 states have (on average 1.9725627553998832) internal successors, (3379), 1718 states have internal predecessors, (3379), 19 states have call successors, (19), 7 states have call predecessors, (19), 7 states have return successors, (19), 18 states have call predecessors, (19), 19 states have call successors, (19) [2023-11-25 00:03:15,437 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2023-11-25 00:03:15,438 INFO L187 NwaCegarLoop]: Found error trace [2023-11-25 00:03:15,438 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] [2023-11-25 00:03:15,440 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-25 00:03:15,447 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-25 00:03:15,448 INFO L85 PathProgramCache]: Analyzing trace with hash 1503082760, now seen corresponding path program 1 times [2023-11-25 00:03:15,457 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-25 00:03:15,457 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1776476175] [2023-11-25 00:03:15,458 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-25 00:03:15,458 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-25 00:03:15,618 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-25 00:03:15,969 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-25 00:03:15,970 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-25 00:03:15,970 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1776476175] [2023-11-25 00:03:15,971 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1776476175] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-25 00:03:15,972 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-25 00:03:15,972 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-11-25 00:03:15,974 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [399667917] [2023-11-25 00:03:15,975 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-25 00:03:15,979 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-25 00:03:15,980 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-25 00:03:16,031 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-25 00:03:16,033 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-25 00:03:16,042 INFO L87 Difference]: Start difference. First operand has 1742 states, 1713 states have (on average 1.9725627553998832) internal successors, (3379), 1718 states have internal predecessors, (3379), 19 states have call successors, (19), 7 states have call predecessors, (19), 7 states have return successors, (19), 18 states have call predecessors, (19), 19 states have call successors, (19) Second operand has 4 states, 4 states have (on average 7.5) internal successors, (30), 4 states have internal predecessors, (30), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2023-11-25 00:03:17,127 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-25 00:03:17,127 INFO L93 Difference]: Finished difference Result 3559 states and 6955 transitions. [2023-11-25 00:03:17,128 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-25 00:03:17,130 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 7.5) internal successors, (30), 4 states have internal predecessors, (30), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) Word has length 41 [2023-11-25 00:03:17,131 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-25 00:03:17,166 INFO L225 Difference]: With dead ends: 3559 [2023-11-25 00:03:17,166 INFO L226 Difference]: Without dead ends: 1816 [2023-11-25 00:03:17,179 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-25 00:03:17,191 INFO L413 NwaCegarLoop]: 3256 mSDtfsCounter, 3498 mSDsluCounter, 3192 mSDsCounter, 0 mSdLazyCounter, 586 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3498 SdHoareTripleChecker+Valid, 6448 SdHoareTripleChecker+Invalid, 600 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 586 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2023-11-25 00:03:17,192 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3498 Valid, 6448 Invalid, 600 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [14 Valid, 586 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2023-11-25 00:03:17,211 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1816 states. [2023-11-25 00:03:17,341 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1816 to 1815. [2023-11-25 00:03:17,347 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1815 states, 1769 states have (on average 1.9479932165065008) internal successors, (3446), 1773 states have internal predecessors, (3446), 32 states have call successors, (32), 13 states have call predecessors, (32), 12 states have return successors, (30), 29 states have call predecessors, (30), 30 states have call successors, (30) [2023-11-25 00:03:17,361 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1815 states to 1815 states and 3508 transitions. [2023-11-25 00:03:17,363 INFO L78 Accepts]: Start accepts. Automaton has 1815 states and 3508 transitions. Word has length 41 [2023-11-25 00:03:17,363 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-25 00:03:17,363 INFO L495 AbstractCegarLoop]: Abstraction has 1815 states and 3508 transitions. [2023-11-25 00:03:17,364 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 7.5) internal successors, (30), 4 states have internal predecessors, (30), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2023-11-25 00:03:17,364 INFO L276 IsEmpty]: Start isEmpty. Operand 1815 states and 3508 transitions. [2023-11-25 00:03:17,369 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2023-11-25 00:03:17,370 INFO L187 NwaCegarLoop]: Found error trace [2023-11-25 00:03:17,370 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-25 00:03:17,370 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-25 00:03:17,371 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-25 00:03:17,371 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-25 00:03:17,372 INFO L85 PathProgramCache]: Analyzing trace with hash -153585464, now seen corresponding path program 1 times [2023-11-25 00:03:17,372 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-25 00:03:17,372 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1715966367] [2023-11-25 00:03:17,373 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-25 00:03:17,373 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-25 00:03:17,399 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-25 00:03:17,578 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2023-11-25 00:03:17,578 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-25 00:03:17,579 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1715966367] [2023-11-25 00:03:17,579 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1715966367] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-25 00:03:17,579 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1559196723] [2023-11-25 00:03:17,580 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-25 00:03:17,580 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-25 00:03:17,580 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7cefd2f5-a2d9-4289-9d32-123615026949/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-25 00:03:17,584 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7cefd2f5-a2d9-4289-9d32-123615026949/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-25 00:03:17,597 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7cefd2f5-a2d9-4289-9d32-123615026949/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-25 00:03:17,734 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-25 00:03:17,737 INFO L262 TraceCheckSpWp]: Trace formula consists of 424 conjuncts, 2 conjunts are in the unsatisfiable core [2023-11-25 00:03:17,745 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-25 00:03:17,823 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-11-25 00:03:17,824 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-25 00:03:17,826 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1559196723] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-25 00:03:17,827 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-25 00:03:17,827 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2023-11-25 00:03:17,828 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1295854081] [2023-11-25 00:03:17,828 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-25 00:03:17,829 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-25 00:03:17,829 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-25 00:03:17,830 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-25 00:03:17,831 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-25 00:03:17,831 INFO L87 Difference]: Start difference. First operand 1815 states and 3508 transitions. Second operand has 3 states, 3 states have (on average 16.666666666666668) internal successors, (50), 2 states have internal predecessors, (50), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-11-25 00:03:18,340 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-25 00:03:18,340 INFO L93 Difference]: Finished difference Result 2146 states and 3973 transitions. [2023-11-25 00:03:18,341 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-25 00:03:18,341 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 16.666666666666668) internal successors, (50), 2 states have internal predecessors, (50), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 75 [2023-11-25 00:03:18,341 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-25 00:03:18,362 INFO L225 Difference]: With dead ends: 2146 [2023-11-25 00:03:18,362 INFO L226 Difference]: Without dead ends: 1977 [2023-11-25 00:03:18,365 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 75 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-25 00:03:18,366 INFO L413 NwaCegarLoop]: 3207 mSDtfsCounter, 3375 mSDsluCounter, 101 mSDsCounter, 0 mSdLazyCounter, 265 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3375 SdHoareTripleChecker+Valid, 3308 SdHoareTripleChecker+Invalid, 267 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 265 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-11-25 00:03:18,367 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3375 Valid, 3308 Invalid, 267 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 265 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-11-25 00:03:18,374 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1977 states. [2023-11-25 00:03:18,438 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1977 to 1971. [2023-11-25 00:03:18,444 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1971 states, 1889 states have (on average 1.9105346744309157) internal successors, (3609), 1894 states have internal predecessors, (3609), 56 states have call successors, (56), 25 states have call predecessors, (56), 24 states have return successors, (54), 52 states have call predecessors, (54), 54 states have call successors, (54) [2023-11-25 00:03:18,458 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1971 states to 1971 states and 3719 transitions. [2023-11-25 00:03:18,458 INFO L78 Accepts]: Start accepts. Automaton has 1971 states and 3719 transitions. Word has length 75 [2023-11-25 00:03:18,459 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-25 00:03:18,459 INFO L495 AbstractCegarLoop]: Abstraction has 1971 states and 3719 transitions. [2023-11-25 00:03:18,459 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 16.666666666666668) internal successors, (50), 2 states have internal predecessors, (50), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-11-25 00:03:18,460 INFO L276 IsEmpty]: Start isEmpty. Operand 1971 states and 3719 transitions. [2023-11-25 00:03:18,467 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2023-11-25 00:03:18,467 INFO L187 NwaCegarLoop]: Found error trace [2023-11-25 00:03:18,468 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-25 00:03:18,480 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7cefd2f5-a2d9-4289-9d32-123615026949/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2023-11-25 00:03:18,675 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7cefd2f5-a2d9-4289-9d32-123615026949/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-25 00:03:18,675 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-25 00:03:18,676 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-25 00:03:18,676 INFO L85 PathProgramCache]: Analyzing trace with hash 975649162, now seen corresponding path program 1 times [2023-11-25 00:03:18,676 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-25 00:03:18,677 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1685109194] [2023-11-25 00:03:18,677 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-25 00:03:18,677 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-25 00:03:18,717 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-25 00:03:18,849 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2023-11-25 00:03:18,850 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-25 00:03:18,850 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1685109194] [2023-11-25 00:03:18,850 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1685109194] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-25 00:03:18,853 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1845560659] [2023-11-25 00:03:18,853 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-25 00:03:18,854 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-25 00:03:18,854 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7cefd2f5-a2d9-4289-9d32-123615026949/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-25 00:03:18,857 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7cefd2f5-a2d9-4289-9d32-123615026949/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-25 00:03:18,880 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7cefd2f5-a2d9-4289-9d32-123615026949/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-25 00:03:19,009 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-25 00:03:19,011 INFO L262 TraceCheckSpWp]: Trace formula consists of 418 conjuncts, 2 conjunts are in the unsatisfiable core [2023-11-25 00:03:19,016 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-25 00:03:19,066 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2023-11-25 00:03:19,067 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-25 00:03:19,067 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1845560659] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-25 00:03:19,067 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-25 00:03:19,067 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2023-11-25 00:03:19,068 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [851344418] [2023-11-25 00:03:19,068 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-25 00:03:19,068 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-25 00:03:19,069 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-25 00:03:19,069 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-25 00:03:19,070 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-25 00:03:19,070 INFO L87 Difference]: Start difference. First operand 1971 states and 3719 transitions. Second operand has 3 states, 3 states have (on average 15.666666666666666) internal successors, (47), 2 states have internal predecessors, (47), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-11-25 00:03:19,613 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-25 00:03:19,613 INFO L93 Difference]: Finished difference Result 2608 states and 4606 transitions. [2023-11-25 00:03:19,613 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-25 00:03:19,614 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 15.666666666666666) internal successors, (47), 2 states have internal predecessors, (47), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 75 [2023-11-25 00:03:19,614 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-25 00:03:19,630 INFO L225 Difference]: With dead ends: 2608 [2023-11-25 00:03:19,630 INFO L226 Difference]: Without dead ends: 2283 [2023-11-25 00:03:19,633 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 75 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-25 00:03:19,634 INFO L413 NwaCegarLoop]: 3205 mSDtfsCounter, 3378 mSDsluCounter, 101 mSDsCounter, 0 mSdLazyCounter, 265 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3378 SdHoareTripleChecker+Valid, 3306 SdHoareTripleChecker+Invalid, 267 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 265 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-11-25 00:03:19,635 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3378 Valid, 3306 Invalid, 267 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 265 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-11-25 00:03:19,641 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2283 states. [2023-11-25 00:03:19,718 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2283 to 2275. [2023-11-25 00:03:19,724 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2275 states, 2123 states have (on average 1.8478568064060292) internal successors, (3923), 2130 states have internal predecessors, (3923), 102 states have call successors, (102), 49 states have call predecessors, (102), 48 states have return successors, (100), 96 states have call predecessors, (100), 100 states have call successors, (100) [2023-11-25 00:03:19,740 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2275 states to 2275 states and 4125 transitions. [2023-11-25 00:03:19,741 INFO L78 Accepts]: Start accepts. Automaton has 2275 states and 4125 transitions. Word has length 75 [2023-11-25 00:03:19,741 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-25 00:03:19,741 INFO L495 AbstractCegarLoop]: Abstraction has 2275 states and 4125 transitions. [2023-11-25 00:03:19,742 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 15.666666666666666) internal successors, (47), 2 states have internal predecessors, (47), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-11-25 00:03:19,742 INFO L276 IsEmpty]: Start isEmpty. Operand 2275 states and 4125 transitions. [2023-11-25 00:03:19,744 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2023-11-25 00:03:19,745 INFO L187 NwaCegarLoop]: Found error trace [2023-11-25 00:03:19,745 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-25 00:03:19,757 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7cefd2f5-a2d9-4289-9d32-123615026949/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-11-25 00:03:19,951 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7cefd2f5-a2d9-4289-9d32-123615026949/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-25 00:03:19,951 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-25 00:03:19,952 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-25 00:03:19,952 INFO L85 PathProgramCache]: Analyzing trace with hash -474437240, now seen corresponding path program 1 times [2023-11-25 00:03:19,952 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-25 00:03:19,952 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [296373380] [2023-11-25 00:03:19,952 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-25 00:03:19,952 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-25 00:03:19,976 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-25 00:03:20,478 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2023-11-25 00:03:20,478 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-25 00:03:20,478 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [296373380] [2023-11-25 00:03:20,481 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [296373380] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-25 00:03:20,482 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-25 00:03:20,482 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2023-11-25 00:03:20,483 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1548169293] [2023-11-25 00:03:20,486 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-25 00:03:20,487 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-11-25 00:03:20,488 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-25 00:03:20,488 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-11-25 00:03:20,488 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2023-11-25 00:03:20,489 INFO L87 Difference]: Start difference. First operand 2275 states and 4125 transitions. Second operand has 6 states, 6 states have (on average 7.333333333333333) internal successors, (44), 6 states have internal predecessors, (44), 4 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2023-11-25 00:03:21,697 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-25 00:03:21,697 INFO L93 Difference]: Finished difference Result 3579 states and 5883 transitions. [2023-11-25 00:03:21,698 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2023-11-25 00:03:21,698 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 7.333333333333333) internal successors, (44), 6 states have internal predecessors, (44), 4 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) Word has length 75 [2023-11-25 00:03:21,700 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-25 00:03:21,724 INFO L225 Difference]: With dead ends: 3579 [2023-11-25 00:03:21,724 INFO L226 Difference]: Without dead ends: 2951 [2023-11-25 00:03:21,728 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=41, Invalid=69, Unknown=0, NotChecked=0, Total=110 [2023-11-25 00:03:21,731 INFO L413 NwaCegarLoop]: 3175 mSDtfsCounter, 3577 mSDsluCounter, 9412 mSDsCounter, 0 mSdLazyCounter, 1054 mSolverCounterSat, 82 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3589 SdHoareTripleChecker+Valid, 12587 SdHoareTripleChecker+Invalid, 1136 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 82 IncrementalHoareTripleChecker+Valid, 1054 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2023-11-25 00:03:21,732 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3589 Valid, 12587 Invalid, 1136 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [82 Valid, 1054 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2023-11-25 00:03:21,739 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2951 states. [2023-11-25 00:03:21,876 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2951 to 2851. [2023-11-25 00:03:21,884 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2851 states, 2563 states have (on average 1.7569254779555208) internal successors, (4503), 2574 states have internal predecessors, (4503), 190 states have call successors, (190), 97 states have call predecessors, (190), 96 states have return successors, (188), 180 states have call predecessors, (188), 188 states have call successors, (188) [2023-11-25 00:03:21,905 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2851 states to 2851 states and 4881 transitions. [2023-11-25 00:03:21,905 INFO L78 Accepts]: Start accepts. Automaton has 2851 states and 4881 transitions. Word has length 75 [2023-11-25 00:03:21,906 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-25 00:03:21,906 INFO L495 AbstractCegarLoop]: Abstraction has 2851 states and 4881 transitions. [2023-11-25 00:03:21,906 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 7.333333333333333) internal successors, (44), 6 states have internal predecessors, (44), 4 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2023-11-25 00:03:21,907 INFO L276 IsEmpty]: Start isEmpty. Operand 2851 states and 4881 transitions. [2023-11-25 00:03:21,910 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2023-11-25 00:03:21,910 INFO L187 NwaCegarLoop]: Found error trace [2023-11-25 00:03:21,911 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-25 00:03:21,911 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2023-11-25 00:03:21,911 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-25 00:03:21,912 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-25 00:03:21,912 INFO L85 PathProgramCache]: Analyzing trace with hash 1139237829, now seen corresponding path program 1 times [2023-11-25 00:03:21,912 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-25 00:03:21,912 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [563574085] [2023-11-25 00:03:21,912 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-25 00:03:21,913 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-25 00:03:21,937 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-25 00:03:22,379 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 10 proven. 14 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2023-11-25 00:03:22,380 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-25 00:03:22,380 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [563574085] [2023-11-25 00:03:22,380 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [563574085] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-25 00:03:22,380 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1346779714] [2023-11-25 00:03:22,381 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-25 00:03:22,381 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-25 00:03:22,381 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7cefd2f5-a2d9-4289-9d32-123615026949/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-25 00:03:22,382 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7cefd2f5-a2d9-4289-9d32-123615026949/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-25 00:03:22,416 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7cefd2f5-a2d9-4289-9d32-123615026949/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-25 00:03:22,552 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-25 00:03:22,555 INFO L262 TraceCheckSpWp]: Trace formula consists of 443 conjuncts, 2 conjunts are in the unsatisfiable core [2023-11-25 00:03:22,568 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-25 00:03:22,611 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 19 proven. 0 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2023-11-25 00:03:22,612 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-25 00:03:22,612 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1346779714] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-25 00:03:22,612 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-25 00:03:22,613 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2023-11-25 00:03:22,613 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1377861001] [2023-11-25 00:03:22,613 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-25 00:03:22,614 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-25 00:03:22,614 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-25 00:03:22,615 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-25 00:03:22,615 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-11-25 00:03:22,617 INFO L87 Difference]: Start difference. First operand 2851 states and 4881 transitions. Second operand has 3 states, 3 states have (on average 17.666666666666668) internal successors, (53), 3 states have internal predecessors, (53), 3 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2023-11-25 00:03:23,336 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-25 00:03:23,336 INFO L93 Difference]: Finished difference Result 3802 states and 6174 transitions. [2023-11-25 00:03:23,337 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-25 00:03:23,337 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 17.666666666666668) internal successors, (53), 3 states have internal predecessors, (53), 3 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) Word has length 89 [2023-11-25 00:03:23,338 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-25 00:03:23,360 INFO L225 Difference]: With dead ends: 3802 [2023-11-25 00:03:23,360 INFO L226 Difference]: Without dead ends: 3166 [2023-11-25 00:03:23,364 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 96 GetRequests, 91 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-11-25 00:03:23,364 INFO L413 NwaCegarLoop]: 3218 mSDtfsCounter, 47 mSDsluCounter, 3168 mSDsCounter, 0 mSdLazyCounter, 482 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 47 SdHoareTripleChecker+Valid, 6386 SdHoareTripleChecker+Invalid, 482 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 482 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-11-25 00:03:23,365 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [47 Valid, 6386 Invalid, 482 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 482 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-11-25 00:03:23,371 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3166 states. [2023-11-25 00:03:23,520 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3166 to 3035. [2023-11-25 00:03:23,528 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3035 states, 2731 states have (on average 1.7396558037348957) internal successors, (4751), 2742 states have internal predecessors, (4751), 198 states have call successors, (198), 105 states have call predecessors, (198), 104 states have return successors, (196), 188 states have call predecessors, (196), 196 states have call successors, (196) [2023-11-25 00:03:23,545 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3035 states to 3035 states and 5145 transitions. [2023-11-25 00:03:23,547 INFO L78 Accepts]: Start accepts. Automaton has 3035 states and 5145 transitions. Word has length 89 [2023-11-25 00:03:23,548 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-25 00:03:23,548 INFO L495 AbstractCegarLoop]: Abstraction has 3035 states and 5145 transitions. [2023-11-25 00:03:23,549 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 17.666666666666668) internal successors, (53), 3 states have internal predecessors, (53), 3 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2023-11-25 00:03:23,549 INFO L276 IsEmpty]: Start isEmpty. Operand 3035 states and 5145 transitions. [2023-11-25 00:03:23,562 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2023-11-25 00:03:23,562 INFO L187 NwaCegarLoop]: Found error trace [2023-11-25 00:03:23,562 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-25 00:03:23,574 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7cefd2f5-a2d9-4289-9d32-123615026949/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-11-25 00:03:23,774 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7cefd2f5-a2d9-4289-9d32-123615026949/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-25 00:03:23,775 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-25 00:03:23,775 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-25 00:03:23,775 INFO L85 PathProgramCache]: Analyzing trace with hash -1076987692, now seen corresponding path program 1 times [2023-11-25 00:03:23,776 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-25 00:03:23,776 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1308602290] [2023-11-25 00:03:23,776 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-25 00:03:23,776 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-25 00:03:23,805 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-25 00:03:23,874 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2023-11-25 00:03:23,874 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-25 00:03:23,875 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1308602290] [2023-11-25 00:03:23,875 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1308602290] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-25 00:03:23,875 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-25 00:03:23,875 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-25 00:03:23,875 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1994636187] [2023-11-25 00:03:23,876 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-25 00:03:23,876 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-25 00:03:23,876 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-25 00:03:23,877 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-25 00:03:23,877 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-25 00:03:23,877 INFO L87 Difference]: Start difference. First operand 3035 states and 5145 transitions. Second operand has 3 states, 3 states have (on average 17.333333333333332) internal successors, (52), 3 states have internal predecessors, (52), 3 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2023-11-25 00:03:24,535 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-25 00:03:24,535 INFO L93 Difference]: Finished difference Result 5116 states and 7974 transitions. [2023-11-25 00:03:24,536 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-25 00:03:24,536 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 17.333333333333332) internal successors, (52), 3 states have internal predecessors, (52), 3 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 99 [2023-11-25 00:03:24,537 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-25 00:03:24,563 INFO L225 Difference]: With dead ends: 5116 [2023-11-25 00:03:24,563 INFO L226 Difference]: Without dead ends: 3727 [2023-11-25 00:03:24,570 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-25 00:03:24,571 INFO L413 NwaCegarLoop]: 3207 mSDtfsCounter, 3370 mSDsluCounter, 101 mSDsCounter, 0 mSdLazyCounter, 265 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3370 SdHoareTripleChecker+Valid, 3308 SdHoareTripleChecker+Invalid, 267 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 265 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-11-25 00:03:24,571 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3370 Valid, 3308 Invalid, 267 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 265 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-11-25 00:03:24,578 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3727 states. [2023-11-25 00:03:24,794 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3727 to 3711. [2023-11-25 00:03:24,803 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3711 states, 3263 states have (on average 1.6705485749310451) internal successors, (5451), 3278 states have internal predecessors, (5451), 290 states have call successors, (290), 157 states have call predecessors, (290), 156 states have return successors, (288), 276 states have call predecessors, (288), 288 states have call successors, (288) [2023-11-25 00:03:24,818 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3711 states to 3711 states and 6029 transitions. [2023-11-25 00:03:24,819 INFO L78 Accepts]: Start accepts. Automaton has 3711 states and 6029 transitions. Word has length 99 [2023-11-25 00:03:24,819 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-25 00:03:24,820 INFO L495 AbstractCegarLoop]: Abstraction has 3711 states and 6029 transitions. [2023-11-25 00:03:24,820 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 17.333333333333332) internal successors, (52), 3 states have internal predecessors, (52), 3 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2023-11-25 00:03:24,820 INFO L276 IsEmpty]: Start isEmpty. Operand 3711 states and 6029 transitions. [2023-11-25 00:03:24,829 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2023-11-25 00:03:24,829 INFO L187 NwaCegarLoop]: Found error trace [2023-11-25 00:03:24,830 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-25 00:03:24,830 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2023-11-25 00:03:24,830 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-25 00:03:24,831 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-25 00:03:24,831 INFO L85 PathProgramCache]: Analyzing trace with hash -1921938415, now seen corresponding path program 1 times [2023-11-25 00:03:24,831 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-25 00:03:24,831 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [837378603] [2023-11-25 00:03:24,832 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-25 00:03:24,832 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-25 00:03:24,856 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-25 00:03:25,183 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 10 proven. 27 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2023-11-25 00:03:25,183 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-25 00:03:25,184 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [837378603] [2023-11-25 00:03:25,184 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [837378603] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-25 00:03:25,184 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1265336876] [2023-11-25 00:03:25,184 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-25 00:03:25,184 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-25 00:03:25,185 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7cefd2f5-a2d9-4289-9d32-123615026949/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-25 00:03:25,186 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7cefd2f5-a2d9-4289-9d32-123615026949/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-25 00:03:25,212 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7cefd2f5-a2d9-4289-9d32-123615026949/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-11-25 00:03:25,360 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-25 00:03:25,364 INFO L262 TraceCheckSpWp]: Trace formula consists of 544 conjuncts, 3 conjunts are in the unsatisfiable core [2023-11-25 00:03:25,374 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-25 00:03:25,433 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 62 proven. 0 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2023-11-25 00:03:25,433 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-25 00:03:25,434 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1265336876] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-25 00:03:25,434 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-25 00:03:25,434 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2023-11-25 00:03:25,434 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [463840239] [2023-11-25 00:03:25,435 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-25 00:03:25,435 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-25 00:03:25,436 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-25 00:03:25,436 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-25 00:03:25,437 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-11-25 00:03:25,437 INFO L87 Difference]: Start difference. First operand 3711 states and 6029 transitions. Second operand has 3 states, 3 states have (on average 27.0) internal successors, (81), 3 states have internal predecessors, (81), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2023-11-25 00:03:26,199 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-25 00:03:26,199 INFO L93 Difference]: Finished difference Result 5111 states and 7995 transitions. [2023-11-25 00:03:26,199 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-25 00:03:26,200 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 27.0) internal successors, (81), 3 states have internal predecessors, (81), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) Word has length 113 [2023-11-25 00:03:26,200 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-25 00:03:26,226 INFO L225 Difference]: With dead ends: 5111 [2023-11-25 00:03:26,227 INFO L226 Difference]: Without dead ends: 3723 [2023-11-25 00:03:26,234 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 120 GetRequests, 115 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-11-25 00:03:26,236 INFO L413 NwaCegarLoop]: 3221 mSDtfsCounter, 102 mSDsluCounter, 3158 mSDsCounter, 0 mSdLazyCounter, 482 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 102 SdHoareTripleChecker+Valid, 6379 SdHoareTripleChecker+Invalid, 484 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 482 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-11-25 00:03:26,236 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [102 Valid, 6379 Invalid, 484 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 482 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-11-25 00:03:26,244 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3723 states. [2023-11-25 00:03:26,465 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3723 to 3703. [2023-11-25 00:03:26,474 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3703 states, 3255 states have (on average 1.6599078341013824) internal successors, (5403), 3270 states have internal predecessors, (5403), 290 states have call successors, (290), 157 states have call predecessors, (290), 156 states have return successors, (288), 276 states have call predecessors, (288), 288 states have call successors, (288) [2023-11-25 00:03:26,491 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3703 states to 3703 states and 5981 transitions. [2023-11-25 00:03:26,492 INFO L78 Accepts]: Start accepts. Automaton has 3703 states and 5981 transitions. Word has length 113 [2023-11-25 00:03:26,492 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-25 00:03:26,492 INFO L495 AbstractCegarLoop]: Abstraction has 3703 states and 5981 transitions. [2023-11-25 00:03:26,493 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 27.0) internal successors, (81), 3 states have internal predecessors, (81), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2023-11-25 00:03:26,493 INFO L276 IsEmpty]: Start isEmpty. Operand 3703 states and 5981 transitions. [2023-11-25 00:03:26,503 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2023-11-25 00:03:26,503 INFO L187 NwaCegarLoop]: Found error trace [2023-11-25 00:03:26,504 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-25 00:03:26,510 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7cefd2f5-a2d9-4289-9d32-123615026949/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-11-25 00:03:26,710 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7cefd2f5-a2d9-4289-9d32-123615026949/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-25 00:03:26,710 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-25 00:03:26,710 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-25 00:03:26,711 INFO L85 PathProgramCache]: Analyzing trace with hash -756665551, now seen corresponding path program 1 times [2023-11-25 00:03:26,711 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-25 00:03:26,711 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [203437846] [2023-11-25 00:03:26,711 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-25 00:03:26,711 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-25 00:03:26,746 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-25 00:03:27,029 INFO L134 CoverageAnalysis]: Checked inductivity of 71 backedges. 10 proven. 25 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2023-11-25 00:03:27,029 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-25 00:03:27,029 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [203437846] [2023-11-25 00:03:27,030 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [203437846] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-25 00:03:27,030 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1268217884] [2023-11-25 00:03:27,030 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-25 00:03:27,030 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-25 00:03:27,031 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7cefd2f5-a2d9-4289-9d32-123615026949/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-25 00:03:27,032 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7cefd2f5-a2d9-4289-9d32-123615026949/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-25 00:03:27,052 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7cefd2f5-a2d9-4289-9d32-123615026949/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-11-25 00:03:27,199 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-25 00:03:27,202 INFO L262 TraceCheckSpWp]: Trace formula consists of 550 conjuncts, 2 conjunts are in the unsatisfiable core [2023-11-25 00:03:27,210 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-25 00:03:27,248 INFO L134 CoverageAnalysis]: Checked inductivity of 71 backedges. 51 proven. 0 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2023-11-25 00:03:27,248 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-25 00:03:27,249 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1268217884] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-25 00:03:27,249 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-25 00:03:27,249 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2023-11-25 00:03:27,249 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1318914703] [2023-11-25 00:03:27,250 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-25 00:03:27,251 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-25 00:03:27,251 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-25 00:03:27,252 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-25 00:03:27,252 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-11-25 00:03:27,252 INFO L87 Difference]: Start difference. First operand 3703 states and 5981 transitions. Second operand has 3 states, 3 states have (on average 25.0) internal successors, (75), 3 states have internal predecessors, (75), 3 states have call successors, (11), 3 states have call predecessors, (11), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) [2023-11-25 00:03:27,892 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-25 00:03:27,892 INFO L93 Difference]: Finished difference Result 5523 states and 8362 transitions. [2023-11-25 00:03:27,892 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-25 00:03:27,893 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 25.0) internal successors, (75), 3 states have internal predecessors, (75), 3 states have call successors, (11), 3 states have call predecessors, (11), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) Word has length 113 [2023-11-25 00:03:27,907 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-25 00:03:27,956 INFO L225 Difference]: With dead ends: 5523 [2023-11-25 00:03:27,956 INFO L226 Difference]: Without dead ends: 4151 [2023-11-25 00:03:27,963 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 120 GetRequests, 115 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-11-25 00:03:27,965 INFO L413 NwaCegarLoop]: 3178 mSDtfsCounter, 3380 mSDsluCounter, 24 mSDsCounter, 0 mSdLazyCounter, 242 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3380 SdHoareTripleChecker+Valid, 3202 SdHoareTripleChecker+Invalid, 246 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 242 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-11-25 00:03:27,965 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3380 Valid, 3202 Invalid, 246 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 242 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-11-25 00:03:27,973 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4151 states. [2023-11-25 00:03:28,179 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4151 to 4151. [2023-11-25 00:03:28,195 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4151 states, 3639 states have (on average 1.606760098928277) internal successors, (5847), 3654 states have internal predecessors, (5847), 310 states have call successors, (310), 201 states have call predecessors, (310), 200 states have return successors, (308), 296 states have call predecessors, (308), 308 states have call successors, (308) [2023-11-25 00:03:28,208 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4151 states to 4151 states and 6465 transitions. [2023-11-25 00:03:28,209 INFO L78 Accepts]: Start accepts. Automaton has 4151 states and 6465 transitions. Word has length 113 [2023-11-25 00:03:28,210 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-25 00:03:28,210 INFO L495 AbstractCegarLoop]: Abstraction has 4151 states and 6465 transitions. [2023-11-25 00:03:28,211 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 25.0) internal successors, (75), 3 states have internal predecessors, (75), 3 states have call successors, (11), 3 states have call predecessors, (11), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) [2023-11-25 00:03:28,211 INFO L276 IsEmpty]: Start isEmpty. Operand 4151 states and 6465 transitions. [2023-11-25 00:03:28,220 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2023-11-25 00:03:28,220 INFO L187 NwaCegarLoop]: Found error trace [2023-11-25 00:03:28,220 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-25 00:03:28,232 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7cefd2f5-a2d9-4289-9d32-123615026949/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2023-11-25 00:03:28,437 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7cefd2f5-a2d9-4289-9d32-123615026949/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-25 00:03:28,437 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-25 00:03:28,438 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-25 00:03:28,438 INFO L85 PathProgramCache]: Analyzing trace with hash -1516024224, now seen corresponding path program 1 times [2023-11-25 00:03:28,438 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-25 00:03:28,438 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [634978589] [2023-11-25 00:03:28,438 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-25 00:03:28,439 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-25 00:03:28,457 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-25 00:03:28,716 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 10 proven. 26 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2023-11-25 00:03:28,717 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-25 00:03:28,717 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [634978589] [2023-11-25 00:03:28,717 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [634978589] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-25 00:03:28,717 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [749819613] [2023-11-25 00:03:28,718 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-25 00:03:28,718 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-25 00:03:28,718 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7cefd2f5-a2d9-4289-9d32-123615026949/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-25 00:03:28,719 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7cefd2f5-a2d9-4289-9d32-123615026949/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-25 00:03:28,741 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7cefd2f5-a2d9-4289-9d32-123615026949/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-11-25 00:03:28,886 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-25 00:03:28,889 INFO L262 TraceCheckSpWp]: Trace formula consists of 549 conjuncts, 3 conjunts are in the unsatisfiable core [2023-11-25 00:03:28,893 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-25 00:03:28,926 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 54 proven. 0 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2023-11-25 00:03:28,926 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-25 00:03:28,927 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [749819613] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-25 00:03:28,927 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-25 00:03:28,927 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2023-11-25 00:03:28,927 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1900891682] [2023-11-25 00:03:28,927 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-25 00:03:28,928 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-25 00:03:28,929 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-25 00:03:28,929 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-25 00:03:28,929 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-11-25 00:03:28,930 INFO L87 Difference]: Start difference. First operand 4151 states and 6465 transitions. Second operand has 3 states, 3 states have (on average 26.333333333333332) internal successors, (79), 3 states have internal predecessors, (79), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2023-11-25 00:03:29,656 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-25 00:03:29,656 INFO L93 Difference]: Finished difference Result 7559 states and 10884 transitions. [2023-11-25 00:03:29,657 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-25 00:03:29,657 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 26.333333333333332) internal successors, (79), 3 states have internal predecessors, (79), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) Word has length 114 [2023-11-25 00:03:29,657 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-25 00:03:29,676 INFO L225 Difference]: With dead ends: 7559 [2023-11-25 00:03:29,676 INFO L226 Difference]: Without dead ends: 5055 [2023-11-25 00:03:29,685 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 121 GetRequests, 116 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-11-25 00:03:29,686 INFO L413 NwaCegarLoop]: 3181 mSDtfsCounter, 60 mSDsluCounter, 3149 mSDsCounter, 0 mSdLazyCounter, 472 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 60 SdHoareTripleChecker+Valid, 6330 SdHoareTripleChecker+Invalid, 474 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 472 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-11-25 00:03:29,687 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [60 Valid, 6330 Invalid, 474 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 472 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-11-25 00:03:29,695 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5055 states. [2023-11-25 00:03:30,034 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5055 to 4415. [2023-11-25 00:03:30,041 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4415 states, 3875 states have (on average 1.5976774193548386) internal successors, (6191), 3891 states have internal predecessors, (6191), 324 states have call successors, (324), 215 states have call predecessors, (324), 214 states have return successors, (322), 309 states have call predecessors, (322), 322 states have call successors, (322) [2023-11-25 00:03:30,056 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4415 states to 4415 states and 6837 transitions. [2023-11-25 00:03:30,057 INFO L78 Accepts]: Start accepts. Automaton has 4415 states and 6837 transitions. Word has length 114 [2023-11-25 00:03:30,058 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-25 00:03:30,058 INFO L495 AbstractCegarLoop]: Abstraction has 4415 states and 6837 transitions. [2023-11-25 00:03:30,058 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 26.333333333333332) internal successors, (79), 3 states have internal predecessors, (79), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2023-11-25 00:03:30,058 INFO L276 IsEmpty]: Start isEmpty. Operand 4415 states and 6837 transitions. [2023-11-25 00:03:30,068 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2023-11-25 00:03:30,068 INFO L187 NwaCegarLoop]: Found error trace [2023-11-25 00:03:30,068 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-25 00:03:30,084 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7cefd2f5-a2d9-4289-9d32-123615026949/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2023-11-25 00:03:30,275 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7cefd2f5-a2d9-4289-9d32-123615026949/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2023-11-25 00:03:30,275 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-25 00:03:30,275 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-25 00:03:30,276 INFO L85 PathProgramCache]: Analyzing trace with hash 978884863, now seen corresponding path program 1 times [2023-11-25 00:03:30,276 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-25 00:03:30,276 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1057548129] [2023-11-25 00:03:30,276 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-25 00:03:30,276 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-25 00:03:30,301 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-25 00:03:30,392 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 23 proven. 1 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2023-11-25 00:03:30,393 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-25 00:03:30,393 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1057548129] [2023-11-25 00:03:30,393 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1057548129] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-25 00:03:30,393 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [44179954] [2023-11-25 00:03:30,393 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-25 00:03:30,393 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-25 00:03:30,393 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7cefd2f5-a2d9-4289-9d32-123615026949/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-25 00:03:30,396 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7cefd2f5-a2d9-4289-9d32-123615026949/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-25 00:03:30,420 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7cefd2f5-a2d9-4289-9d32-123615026949/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-11-25 00:03:30,563 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-25 00:03:30,566 INFO L262 TraceCheckSpWp]: Trace formula consists of 546 conjuncts, 2 conjunts are in the unsatisfiable core [2023-11-25 00:03:30,568 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-25 00:03:30,594 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 59 proven. 0 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2023-11-25 00:03:30,594 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-25 00:03:30,594 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [44179954] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-25 00:03:30,595 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-25 00:03:30,595 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [5] total 6 [2023-11-25 00:03:30,595 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [886743217] [2023-11-25 00:03:30,595 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-25 00:03:30,596 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-25 00:03:30,596 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-25 00:03:30,597 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-25 00:03:30,597 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2023-11-25 00:03:30,597 INFO L87 Difference]: Start difference. First operand 4415 states and 6837 transitions. Second operand has 3 states, 3 states have (on average 26.0) internal successors, (78), 3 states have internal predecessors, (78), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2023-11-25 00:03:31,309 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-25 00:03:31,309 INFO L93 Difference]: Finished difference Result 6851 states and 10037 transitions. [2023-11-25 00:03:31,310 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-25 00:03:31,310 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 26.0) internal successors, (78), 3 states have internal predecessors, (78), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) Word has length 114 [2023-11-25 00:03:31,311 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-25 00:03:31,326 INFO L225 Difference]: With dead ends: 6851 [2023-11-25 00:03:31,326 INFO L226 Difference]: Without dead ends: 5013 [2023-11-25 00:03:31,333 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 118 GetRequests, 114 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2023-11-25 00:03:31,334 INFO L413 NwaCegarLoop]: 3216 mSDtfsCounter, 63 mSDsluCounter, 3168 mSDsCounter, 0 mSdLazyCounter, 479 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 63 SdHoareTripleChecker+Valid, 6384 SdHoareTripleChecker+Invalid, 479 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 479 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-11-25 00:03:31,334 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [63 Valid, 6384 Invalid, 479 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 479 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-11-25 00:03:31,343 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5013 states. [2023-11-25 00:03:31,541 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5013 to 4735. [2023-11-25 00:03:31,550 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4735 states, 4163 states have (on average 1.5909200096084555) internal successors, (6623), 4179 states have internal predecessors, (6623), 340 states have call successors, (340), 231 states have call predecessors, (340), 230 states have return successors, (338), 325 states have call predecessors, (338), 338 states have call successors, (338) [2023-11-25 00:03:31,563 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4735 states to 4735 states and 7301 transitions. [2023-11-25 00:03:31,564 INFO L78 Accepts]: Start accepts. Automaton has 4735 states and 7301 transitions. Word has length 114 [2023-11-25 00:03:31,564 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-25 00:03:31,565 INFO L495 AbstractCegarLoop]: Abstraction has 4735 states and 7301 transitions. [2023-11-25 00:03:31,565 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 26.0) internal successors, (78), 3 states have internal predecessors, (78), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2023-11-25 00:03:31,565 INFO L276 IsEmpty]: Start isEmpty. Operand 4735 states and 7301 transitions. [2023-11-25 00:03:31,575 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2023-11-25 00:03:31,576 INFO L187 NwaCegarLoop]: Found error trace [2023-11-25 00:03:31,576 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-25 00:03:31,588 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7cefd2f5-a2d9-4289-9d32-123615026949/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2023-11-25 00:03:31,782 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7cefd2f5-a2d9-4289-9d32-123615026949/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-25 00:03:31,783 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-25 00:03:31,783 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-25 00:03:31,783 INFO L85 PathProgramCache]: Analyzing trace with hash -2022867159, now seen corresponding path program 1 times [2023-11-25 00:03:31,784 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-25 00:03:31,784 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [429365295] [2023-11-25 00:03:31,784 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-25 00:03:31,784 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-25 00:03:31,802 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-25 00:03:32,045 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 19 proven. 26 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2023-11-25 00:03:32,045 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-25 00:03:32,046 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [429365295] [2023-11-25 00:03:32,046 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [429365295] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-25 00:03:32,046 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1607698051] [2023-11-25 00:03:32,046 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-25 00:03:32,046 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-25 00:03:32,047 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7cefd2f5-a2d9-4289-9d32-123615026949/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-25 00:03:32,048 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7cefd2f5-a2d9-4289-9d32-123615026949/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-25 00:03:32,068 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7cefd2f5-a2d9-4289-9d32-123615026949/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-11-25 00:03:32,214 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-25 00:03:32,217 INFO L262 TraceCheckSpWp]: Trace formula consists of 555 conjuncts, 9 conjunts are in the unsatisfiable core [2023-11-25 00:03:32,220 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-25 00:03:32,330 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 49 proven. 0 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2023-11-25 00:03:32,331 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-25 00:03:32,331 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1607698051] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-25 00:03:32,331 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-25 00:03:32,331 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [6] total 7 [2023-11-25 00:03:32,332 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1353723479] [2023-11-25 00:03:32,333 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-25 00:03:32,333 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-11-25 00:03:32,334 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-25 00:03:32,334 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-11-25 00:03:32,334 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2023-11-25 00:03:32,335 INFO L87 Difference]: Start difference. First operand 4735 states and 7301 transitions. Second operand has 6 states, 6 states have (on average 12.5) internal successors, (75), 6 states have internal predecessors, (75), 3 states have call successors, (10), 4 states have call predecessors, (10), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2023-11-25 00:03:33,560 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-25 00:03:33,561 INFO L93 Difference]: Finished difference Result 9247 states and 13153 transitions. [2023-11-25 00:03:33,561 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-11-25 00:03:33,561 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 12.5) internal successors, (75), 6 states have internal predecessors, (75), 3 states have call successors, (10), 4 states have call predecessors, (10), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 116 [2023-11-25 00:03:33,562 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-25 00:03:33,582 INFO L225 Difference]: With dead ends: 9247 [2023-11-25 00:03:33,582 INFO L226 Difference]: Without dead ends: 6159 [2023-11-25 00:03:33,592 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 127 GetRequests, 118 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=40, Invalid=70, Unknown=0, NotChecked=0, Total=110 [2023-11-25 00:03:33,593 INFO L413 NwaCegarLoop]: 3171 mSDtfsCounter, 3554 mSDsluCounter, 6310 mSDsCounter, 0 mSdLazyCounter, 789 mSolverCounterSat, 85 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3566 SdHoareTripleChecker+Valid, 9481 SdHoareTripleChecker+Invalid, 874 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 85 IncrementalHoareTripleChecker+Valid, 789 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2023-11-25 00:03:33,593 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3566 Valid, 9481 Invalid, 874 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [85 Valid, 789 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2023-11-25 00:03:33,603 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6159 states. [2023-11-25 00:03:33,920 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6159 to 6155. [2023-11-25 00:03:33,930 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 6155 states, 5313 states have (on average 1.5187276491624317) internal successors, (8069), 5335 states have internal predecessors, (8069), 498 states have call successors, (498), 343 states have call predecessors, (498), 342 states have return successors, (496), 477 states have call predecessors, (496), 496 states have call successors, (496) [2023-11-25 00:03:33,948 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6155 states to 6155 states and 9063 transitions. [2023-11-25 00:03:33,949 INFO L78 Accepts]: Start accepts. Automaton has 6155 states and 9063 transitions. Word has length 116 [2023-11-25 00:03:33,949 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-25 00:03:33,949 INFO L495 AbstractCegarLoop]: Abstraction has 6155 states and 9063 transitions. [2023-11-25 00:03:33,950 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 12.5) internal successors, (75), 6 states have internal predecessors, (75), 3 states have call successors, (10), 4 states have call predecessors, (10), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2023-11-25 00:03:33,950 INFO L276 IsEmpty]: Start isEmpty. Operand 6155 states and 9063 transitions. [2023-11-25 00:03:33,963 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2023-11-25 00:03:33,963 INFO L187 NwaCegarLoop]: Found error trace [2023-11-25 00:03:33,963 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-25 00:03:33,974 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7cefd2f5-a2d9-4289-9d32-123615026949/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2023-11-25 00:03:34,169 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7cefd2f5-a2d9-4289-9d32-123615026949/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-25 00:03:34,170 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-25 00:03:34,170 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-25 00:03:34,170 INFO L85 PathProgramCache]: Analyzing trace with hash 1935291708, now seen corresponding path program 1 times [2023-11-25 00:03:34,170 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-25 00:03:34,170 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [917670649] [2023-11-25 00:03:34,171 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-25 00:03:34,171 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-25 00:03:34,207 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-25 00:03:34,297 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 22 proven. 4 refuted. 0 times theorem prover too weak. 47 trivial. 0 not checked. [2023-11-25 00:03:34,298 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-25 00:03:34,298 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [917670649] [2023-11-25 00:03:34,298 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [917670649] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-25 00:03:34,298 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1218857870] [2023-11-25 00:03:34,298 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-25 00:03:34,299 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-25 00:03:34,299 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7cefd2f5-a2d9-4289-9d32-123615026949/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-25 00:03:34,300 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7cefd2f5-a2d9-4289-9d32-123615026949/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-25 00:03:34,332 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7cefd2f5-a2d9-4289-9d32-123615026949/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2023-11-25 00:03:34,479 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-25 00:03:34,482 INFO L262 TraceCheckSpWp]: Trace formula consists of 559 conjuncts, 2 conjunts are in the unsatisfiable core [2023-11-25 00:03:34,486 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-25 00:03:34,513 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 59 proven. 0 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2023-11-25 00:03:34,513 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-25 00:03:34,513 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1218857870] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-25 00:03:34,513 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-25 00:03:34,514 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [5] total 6 [2023-11-25 00:03:34,514 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1090081186] [2023-11-25 00:03:34,514 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-25 00:03:34,514 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-25 00:03:34,515 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-25 00:03:34,515 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-25 00:03:34,515 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2023-11-25 00:03:34,516 INFO L87 Difference]: Start difference. First operand 6155 states and 9063 transitions. Second operand has 3 states, 3 states have (on average 27.0) internal successors, (81), 3 states have internal predecessors, (81), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2023-11-25 00:03:35,363 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-25 00:03:35,363 INFO L93 Difference]: Finished difference Result 10223 states and 14395 transitions. [2023-11-25 00:03:35,364 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-25 00:03:35,364 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 27.0) internal successors, (81), 3 states have internal predecessors, (81), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) Word has length 117 [2023-11-25 00:03:35,364 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-25 00:03:35,386 INFO L225 Difference]: With dead ends: 10223 [2023-11-25 00:03:35,387 INFO L226 Difference]: Without dead ends: 7215 [2023-11-25 00:03:35,396 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 121 GetRequests, 117 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2023-11-25 00:03:35,397 INFO L413 NwaCegarLoop]: 3222 mSDtfsCounter, 67 mSDsluCounter, 3168 mSDsCounter, 0 mSdLazyCounter, 481 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 67 SdHoareTripleChecker+Valid, 6390 SdHoareTripleChecker+Invalid, 481 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 481 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-11-25 00:03:35,397 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [67 Valid, 6390 Invalid, 481 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 481 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-11-25 00:03:35,410 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7215 states. [2023-11-25 00:03:35,853 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7215 to 6707. [2023-11-25 00:03:35,861 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 6707 states, 5801 states have (on average 1.5095673159800034) internal successors, (8757), 5823 states have internal predecessors, (8757), 530 states have call successors, (530), 375 states have call predecessors, (530), 374 states have return successors, (528), 509 states have call predecessors, (528), 528 states have call successors, (528) [2023-11-25 00:03:35,877 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6707 states to 6707 states and 9815 transitions. [2023-11-25 00:03:35,878 INFO L78 Accepts]: Start accepts. Automaton has 6707 states and 9815 transitions. Word has length 117 [2023-11-25 00:03:35,878 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-25 00:03:35,878 INFO L495 AbstractCegarLoop]: Abstraction has 6707 states and 9815 transitions. [2023-11-25 00:03:35,878 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 27.0) internal successors, (81), 3 states have internal predecessors, (81), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2023-11-25 00:03:35,879 INFO L276 IsEmpty]: Start isEmpty. Operand 6707 states and 9815 transitions. [2023-11-25 00:03:35,893 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2023-11-25 00:03:35,893 INFO L187 NwaCegarLoop]: Found error trace [2023-11-25 00:03:35,893 INFO L195 NwaCegarLoop]: trace histogram [5, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-25 00:03:35,905 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7cefd2f5-a2d9-4289-9d32-123615026949/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2023-11-25 00:03:36,099 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7cefd2f5-a2d9-4289-9d32-123615026949/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-25 00:03:36,100 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-25 00:03:36,100 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-25 00:03:36,100 INFO L85 PathProgramCache]: Analyzing trace with hash -569375838, now seen corresponding path program 1 times [2023-11-25 00:03:36,100 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-25 00:03:36,100 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1605770809] [2023-11-25 00:03:36,101 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-25 00:03:36,101 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-25 00:03:36,128 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-25 00:03:36,546 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 12 proven. 26 refuted. 0 times theorem prover too weak. 44 trivial. 0 not checked. [2023-11-25 00:03:36,546 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-25 00:03:36,547 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1605770809] [2023-11-25 00:03:36,547 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1605770809] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-25 00:03:36,547 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1350802006] [2023-11-25 00:03:36,547 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-25 00:03:36,547 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-25 00:03:36,548 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7cefd2f5-a2d9-4289-9d32-123615026949/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-25 00:03:36,553 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7cefd2f5-a2d9-4289-9d32-123615026949/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-25 00:03:36,580 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7cefd2f5-a2d9-4289-9d32-123615026949/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2023-11-25 00:03:36,735 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-25 00:03:36,739 INFO L262 TraceCheckSpWp]: Trace formula consists of 627 conjuncts, 15 conjunts are in the unsatisfiable core [2023-11-25 00:03:36,743 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-25 00:03:36,903 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 62 proven. 14 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-11-25 00:03:36,903 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-25 00:03:37,360 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 17 proven. 3 refuted. 0 times theorem prover too weak. 62 trivial. 0 not checked. [2023-11-25 00:03:37,360 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1350802006] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-25 00:03:37,361 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [568022730] [2023-11-25 00:03:37,387 INFO L159 IcfgInterpreter]: Started Sifa with 71 locations of interest [2023-11-25 00:03:37,387 INFO L166 IcfgInterpreter]: Building call graph [2023-11-25 00:03:37,392 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-25 00:03:37,397 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-25 00:03:37,397 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs