./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/combinations/pc_sfifo_3.cil+token_ring.10.cil-1.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 527bcce2 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_476983e8-cf6d-4a5d-8b08-f92d47554185/bin/utaipan-verify-QoSU8krkJ5/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_476983e8-cf6d-4a5d-8b08-f92d47554185/bin/utaipan-verify-QoSU8krkJ5/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_476983e8-cf6d-4a5d-8b08-f92d47554185/bin/utaipan-verify-QoSU8krkJ5/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_476983e8-cf6d-4a5d-8b08-f92d47554185/bin/utaipan-verify-QoSU8krkJ5/config/TaipanReach.xml -i ../../sv-benchmarks/c/combinations/pc_sfifo_3.cil+token_ring.10.cil-1.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_476983e8-cf6d-4a5d-8b08-f92d47554185/bin/utaipan-verify-QoSU8krkJ5/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_476983e8-cf6d-4a5d-8b08-f92d47554185/bin/utaipan-verify-QoSU8krkJ5 --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 5fa3500dbb7b48d33bda6025d194df10b5d868e3a16ab8452fef68790ebc5c6f --- Real Ultimate output --- This is Ultimate 0.2.3-dev-527bcce [2023-11-21 19:02:58,593 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-21 19:02:58,691 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_476983e8-cf6d-4a5d-8b08-f92d47554185/bin/utaipan-verify-QoSU8krkJ5/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-11-21 19:02:58,697 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-21 19:02:58,698 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-21 19:02:58,725 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-21 19:02:58,726 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-21 19:02:58,727 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-21 19:02:58,727 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-21 19:02:58,728 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-21 19:02:58,728 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-21 19:02:58,729 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-21 19:02:58,730 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-21 19:02:58,730 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-21 19:02:58,733 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-21 19:02:58,734 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-21 19:02:58,734 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-21 19:02:58,735 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-21 19:02:58,738 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-21 19:02:58,739 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-21 19:02:58,739 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-21 19:02:58,740 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-21 19:02:58,741 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-21 19:02:58,742 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-11-21 19:02:58,742 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-21 19:02:58,743 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-21 19:02:58,743 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-21 19:02:58,743 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-21 19:02:58,744 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-11-21 19:02:58,745 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-21 19:02:58,745 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-11-21 19:02:58,745 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-21 19:02:58,746 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-11-21 19:02:58,746 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-21 19:02:58,747 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-21 19:02:58,747 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-11-21 19:02:58,748 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-21 19:02:58,748 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-21 19:02:58,749 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-21 19:02:58,749 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-21 19:02:58,749 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-11-21 19:02:58,750 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-21 19:02:58,750 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-21 19:02:58,751 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-11-21 19:02:58,751 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-11-21 19:02:58,751 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-21 19:02:58,752 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-21 19:02:58,752 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_476983e8-cf6d-4a5d-8b08-f92d47554185/bin/utaipan-verify-QoSU8krkJ5/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_476983e8-cf6d-4a5d-8b08-f92d47554185/bin/utaipan-verify-QoSU8krkJ5 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 5fa3500dbb7b48d33bda6025d194df10b5d868e3a16ab8452fef68790ebc5c6f [2023-11-21 19:02:59,048 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-21 19:02:59,098 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-21 19:02:59,103 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-21 19:02:59,104 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-21 19:02:59,105 INFO L274 PluginConnector]: CDTParser initialized [2023-11-21 19:02:59,106 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_476983e8-cf6d-4a5d-8b08-f92d47554185/bin/utaipan-verify-QoSU8krkJ5/../../sv-benchmarks/c/combinations/pc_sfifo_3.cil+token_ring.10.cil-1.c [2023-11-21 19:03:02,156 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-21 19:03:02,492 INFO L384 CDTParser]: Found 1 translation units. [2023-11-21 19:03:02,492 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_476983e8-cf6d-4a5d-8b08-f92d47554185/sv-benchmarks/c/combinations/pc_sfifo_3.cil+token_ring.10.cil-1.c [2023-11-21 19:03:02,529 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_476983e8-cf6d-4a5d-8b08-f92d47554185/bin/utaipan-verify-QoSU8krkJ5/data/f42f41a38/b94b0fbf3a96432bac295fe7b13c65df/FLAG88f1d64b6 [2023-11-21 19:03:02,546 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_476983e8-cf6d-4a5d-8b08-f92d47554185/bin/utaipan-verify-QoSU8krkJ5/data/f42f41a38/b94b0fbf3a96432bac295fe7b13c65df [2023-11-21 19:03:02,552 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-21 19:03:02,555 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-21 19:03:02,559 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-21 19:03:02,559 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-21 19:03:02,565 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-21 19:03:02,566 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 07:03:02" (1/1) ... [2023-11-21 19:03:02,567 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@c6e48a5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:03:02, skipping insertion in model container [2023-11-21 19:03:02,567 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 07:03:02" (1/1) ... [2023-11-21 19:03:02,650 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-21 19:03:02,870 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_476983e8-cf6d-4a5d-8b08-f92d47554185/sv-benchmarks/c/combinations/pc_sfifo_3.cil+token_ring.10.cil-1.c[911,924] [2023-11-21 19:03:02,965 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_476983e8-cf6d-4a5d-8b08-f92d47554185/sv-benchmarks/c/combinations/pc_sfifo_3.cil+token_ring.10.cil-1.c[8416,8429] [2023-11-21 19:03:03,123 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-21 19:03:03,153 INFO L202 MainTranslator]: Completed pre-run [2023-11-21 19:03:03,168 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_476983e8-cf6d-4a5d-8b08-f92d47554185/sv-benchmarks/c/combinations/pc_sfifo_3.cil+token_ring.10.cil-1.c[911,924] [2023-11-21 19:03:03,217 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_476983e8-cf6d-4a5d-8b08-f92d47554185/sv-benchmarks/c/combinations/pc_sfifo_3.cil+token_ring.10.cil-1.c[8416,8429] [2023-11-21 19:03:03,305 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-21 19:03:03,330 INFO L206 MainTranslator]: Completed translation [2023-11-21 19:03:03,331 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:03:03 WrapperNode [2023-11-21 19:03:03,331 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-21 19:03:03,332 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-21 19:03:03,332 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-21 19:03:03,333 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-21 19:03:03,339 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:03:03" (1/1) ... [2023-11-21 19:03:03,357 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:03:03" (1/1) ... [2023-11-21 19:03:03,423 INFO L138 Inliner]: procedures = 75, calls = 92, calls flagged for inlining = 43, calls inlined = 43, statements flattened = 994 [2023-11-21 19:03:03,423 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-21 19:03:03,424 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-21 19:03:03,424 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-21 19:03:03,424 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-21 19:03:03,435 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:03:03" (1/1) ... [2023-11-21 19:03:03,435 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:03:03" (1/1) ... [2023-11-21 19:03:03,445 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:03:03" (1/1) ... [2023-11-21 19:03:03,446 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:03:03" (1/1) ... [2023-11-21 19:03:03,466 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:03:03" (1/1) ... [2023-11-21 19:03:03,490 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:03:03" (1/1) ... [2023-11-21 19:03:03,494 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:03:03" (1/1) ... [2023-11-21 19:03:03,499 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:03:03" (1/1) ... [2023-11-21 19:03:03,523 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-21 19:03:03,524 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-21 19:03:03,524 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-21 19:03:03,524 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-21 19:03:03,525 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:03:03" (1/1) ... [2023-11-21 19:03:03,550 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-21 19:03:03,578 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_476983e8-cf6d-4a5d-8b08-f92d47554185/bin/utaipan-verify-QoSU8krkJ5/z3 [2023-11-21 19:03:03,605 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_476983e8-cf6d-4a5d-8b08-f92d47554185/bin/utaipan-verify-QoSU8krkJ5/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-21 19:03:03,636 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_476983e8-cf6d-4a5d-8b08-f92d47554185/bin/utaipan-verify-QoSU8krkJ5/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-21 19:03:03,657 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-21 19:03:03,658 INFO L130 BoogieDeclarations]: Found specification of procedure immediate_notify [2023-11-21 19:03:03,659 INFO L138 BoogieDeclarations]: Found implementation of procedure immediate_notify [2023-11-21 19:03:03,659 INFO L130 BoogieDeclarations]: Found specification of procedure is_do_write_p_triggered [2023-11-21 19:03:03,660 INFO L138 BoogieDeclarations]: Found implementation of procedure is_do_write_p_triggered [2023-11-21 19:03:03,660 INFO L130 BoogieDeclarations]: Found specification of procedure exists_runnable_thread1 [2023-11-21 19:03:03,660 INFO L138 BoogieDeclarations]: Found implementation of procedure exists_runnable_thread1 [2023-11-21 19:03:03,660 INFO L130 BoogieDeclarations]: Found specification of procedure exists_runnable_thread2 [2023-11-21 19:03:03,660 INFO L138 BoogieDeclarations]: Found implementation of procedure exists_runnable_thread2 [2023-11-21 19:03:03,661 INFO L130 BoogieDeclarations]: Found specification of procedure reset_delta_events1 [2023-11-21 19:03:03,661 INFO L138 BoogieDeclarations]: Found implementation of procedure reset_delta_events1 [2023-11-21 19:03:03,661 INFO L130 BoogieDeclarations]: Found specification of procedure reset_delta_events2 [2023-11-21 19:03:03,661 INFO L138 BoogieDeclarations]: Found implementation of procedure reset_delta_events2 [2023-11-21 19:03:03,661 INFO L130 BoogieDeclarations]: Found specification of procedure activate_threads2 [2023-11-21 19:03:03,662 INFO L138 BoogieDeclarations]: Found implementation of procedure activate_threads2 [2023-11-21 19:03:03,662 INFO L130 BoogieDeclarations]: Found specification of procedure activate_threads1 [2023-11-21 19:03:03,662 INFO L138 BoogieDeclarations]: Found implementation of procedure activate_threads1 [2023-11-21 19:03:03,663 INFO L130 BoogieDeclarations]: Found specification of procedure is_do_read_c_triggered [2023-11-21 19:03:03,663 INFO L138 BoogieDeclarations]: Found implementation of procedure is_do_read_c_triggered [2023-11-21 19:03:03,663 INFO L130 BoogieDeclarations]: Found specification of procedure update_channels1 [2023-11-21 19:03:03,664 INFO L138 BoogieDeclarations]: Found implementation of procedure update_channels1 [2023-11-21 19:03:03,665 INFO L130 BoogieDeclarations]: Found specification of procedure update_channels2 [2023-11-21 19:03:03,665 INFO L138 BoogieDeclarations]: Found implementation of procedure update_channels2 [2023-11-21 19:03:03,665 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-21 19:03:03,666 INFO L130 BoogieDeclarations]: Found specification of procedure fire_delta_events2 [2023-11-21 19:03:03,666 INFO L138 BoogieDeclarations]: Found implementation of procedure fire_delta_events2 [2023-11-21 19:03:03,666 INFO L130 BoogieDeclarations]: Found specification of procedure fire_delta_events1 [2023-11-21 19:03:03,666 INFO L138 BoogieDeclarations]: Found implementation of procedure fire_delta_events1 [2023-11-21 19:03:03,667 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-21 19:03:03,667 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-21 19:03:03,667 INFO L130 BoogieDeclarations]: Found specification of procedure error1 [2023-11-21 19:03:03,667 INFO L138 BoogieDeclarations]: Found implementation of procedure error1 [2023-11-21 19:03:03,667 INFO L130 BoogieDeclarations]: Found specification of procedure error2 [2023-11-21 19:03:03,668 INFO L138 BoogieDeclarations]: Found implementation of procedure error2 [2023-11-21 19:03:03,911 INFO L240 CfgBuilder]: Building ICFG [2023-11-21 19:03:03,915 INFO L266 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-21 19:03:04,899 INFO L774 $ProcedureCfgBuilder]: dead code at ProgramPoint $Ultimate##56: assume !(1 == ~q_free~0); [2023-11-21 19:03:04,899 INFO L774 $ProcedureCfgBuilder]: dead code at ProgramPoint $Ultimate##55: assume 1 == ~q_free~0;~c_dr_st~0 := 2;~c_dr_pc~0 := 2;~a_t~0 := do_read_c_~a~0#1; [2023-11-21 19:03:05,013 INFO L281 CfgBuilder]: Performing block encoding [2023-11-21 19:03:05,610 INFO L303 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-21 19:03:05,611 INFO L308 CfgBuilder]: Removed 17 assume(true) statements. [2023-11-21 19:03:05,612 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 07:03:05 BoogieIcfgContainer [2023-11-21 19:03:05,613 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-21 19:03:05,615 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-21 19:03:05,616 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-21 19:03:05,619 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-21 19:03:05,619 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.11 07:03:02" (1/3) ... [2023-11-21 19:03:05,620 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@735c969c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 07:03:05, skipping insertion in model container [2023-11-21 19:03:05,620 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:03:03" (2/3) ... [2023-11-21 19:03:05,620 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@735c969c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 07:03:05, skipping insertion in model container [2023-11-21 19:03:05,621 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 07:03:05" (3/3) ... [2023-11-21 19:03:05,622 INFO L112 eAbstractionObserver]: Analyzing ICFG pc_sfifo_3.cil+token_ring.10.cil-1.c [2023-11-21 19:03:05,642 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-21 19:03:05,642 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 2 error locations. [2023-11-21 19:03:05,709 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-21 19:03:05,719 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;@1a86fc24, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-21 19:03:05,719 INFO L358 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2023-11-21 19:03:05,728 INFO L276 IsEmpty]: Start isEmpty. Operand has 262 states, 202 states have (on average 1.5148514851485149) internal successors, (306), 210 states have internal predecessors, (306), 42 states have call successors, (42), 15 states have call predecessors, (42), 15 states have return successors, (42), 40 states have call predecessors, (42), 42 states have call successors, (42) [2023-11-21 19:03:05,743 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2023-11-21 19:03:05,743 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:03:05,744 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 19:03:05,744 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-21 19:03:05,752 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:03:05,752 INFO L85 PathProgramCache]: Analyzing trace with hash 1880275647, now seen corresponding path program 1 times [2023-11-21 19:03:05,763 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:03:05,763 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2138256407] [2023-11-21 19:03:05,764 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:03:05,764 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:03:05,928 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:03:06,245 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 19:03:06,245 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:03:06,246 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2138256407] [2023-11-21 19:03:06,247 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2138256407] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-21 19:03:06,247 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-21 19:03:06,247 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-11-21 19:03:06,249 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1305862364] [2023-11-21 19:03:06,249 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-21 19:03:06,254 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-21 19:03:06,255 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-21 19:03:06,296 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-21 19:03:06,297 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-21 19:03:06,300 INFO L87 Difference]: Start difference. First operand has 262 states, 202 states have (on average 1.5148514851485149) internal successors, (306), 210 states have internal predecessors, (306), 42 states have call successors, (42), 15 states have call predecessors, (42), 15 states have return successors, (42), 40 states have call predecessors, (42), 42 states have call successors, (42) Second operand has 4 states, 4 states have (on average 7.25) internal successors, (29), 4 states have internal predecessors, (29), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 3 states have call predecessors, (7), 4 states have call successors, (7) [2023-11-21 19:03:06,864 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 19:03:06,864 INFO L93 Difference]: Finished difference Result 646 states and 958 transitions. [2023-11-21 19:03:06,865 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-21 19:03:06,866 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 7.25) internal successors, (29), 4 states have internal predecessors, (29), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 3 states have call predecessors, (7), 4 states have call successors, (7) Word has length 44 [2023-11-21 19:03:06,867 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 19:03:06,889 INFO L225 Difference]: With dead ends: 646 [2023-11-21 19:03:06,889 INFO L226 Difference]: Without dead ends: 385 [2023-11-21 19:03:06,895 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 [2023-11-21 19:03:06,898 INFO L413 NwaCegarLoop]: 373 mSDtfsCounter, 439 mSDsluCounter, 288 mSDsCounter, 0 mSdLazyCounter, 294 mSolverCounterSat, 22 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 439 SdHoareTripleChecker+Valid, 661 SdHoareTripleChecker+Invalid, 316 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 294 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-11-21 19:03:06,899 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [439 Valid, 661 Invalid, 316 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 294 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-11-21 19:03:06,918 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 385 states. [2023-11-21 19:03:06,973 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 385 to 374. [2023-11-21 19:03:06,976 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 374 states, 283 states have (on average 1.4346289752650176) internal successors, (406), 288 states have internal predecessors, (406), 62 states have call successors, (62), 29 states have call predecessors, (62), 27 states have return successors, (61), 58 states have call predecessors, (61), 58 states have call successors, (61) [2023-11-21 19:03:06,979 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 374 states to 374 states and 529 transitions. [2023-11-21 19:03:06,981 INFO L78 Accepts]: Start accepts. Automaton has 374 states and 529 transitions. Word has length 44 [2023-11-21 19:03:06,981 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 19:03:06,982 INFO L495 AbstractCegarLoop]: Abstraction has 374 states and 529 transitions. [2023-11-21 19:03:06,982 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 7.25) internal successors, (29), 4 states have internal predecessors, (29), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 3 states have call predecessors, (7), 4 states have call successors, (7) [2023-11-21 19:03:06,982 INFO L276 IsEmpty]: Start isEmpty. Operand 374 states and 529 transitions. [2023-11-21 19:03:06,985 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2023-11-21 19:03:06,985 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:03:06,985 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 19:03:06,986 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-21 19:03:06,986 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-21 19:03:06,986 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:03:06,987 INFO L85 PathProgramCache]: Analyzing trace with hash -1530905144, now seen corresponding path program 1 times [2023-11-21 19:03:06,987 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:03:06,987 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [164671601] [2023-11-21 19:03:06,987 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:03:06,988 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:03:07,017 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:03:07,162 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 19:03:07,163 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:03:07,164 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [164671601] [2023-11-21 19:03:07,164 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [164671601] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-21 19:03:07,164 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-21 19:03:07,165 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2023-11-21 19:03:07,165 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1126892164] [2023-11-21 19:03:07,165 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-21 19:03:07,167 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-11-21 19:03:07,167 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-21 19:03:07,169 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-11-21 19:03:07,169 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-21 19:03:07,170 INFO L87 Difference]: Start difference. First operand 374 states and 529 transitions. Second operand has 6 states, 6 states have (on average 5.0) internal successors, (30), 6 states have internal predecessors, (30), 4 states have call successors, (8), 2 states have call predecessors, (8), 4 states have return successors, (7), 4 states have call predecessors, (7), 4 states have call successors, (7) [2023-11-21 19:03:08,139 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 19:03:08,139 INFO L93 Difference]: Finished difference Result 911 states and 1252 transitions. [2023-11-21 19:03:08,140 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-11-21 19:03:08,141 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 5.0) internal successors, (30), 6 states have internal predecessors, (30), 4 states have call successors, (8), 2 states have call predecessors, (8), 4 states have return successors, (7), 4 states have call predecessors, (7), 4 states have call successors, (7) Word has length 45 [2023-11-21 19:03:08,141 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 19:03:08,148 INFO L225 Difference]: With dead ends: 911 [2023-11-21 19:03:08,148 INFO L226 Difference]: Without dead ends: 445 [2023-11-21 19:03:08,153 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2023-11-21 19:03:08,155 INFO L413 NwaCegarLoop]: 421 mSDtfsCounter, 944 mSDsluCounter, 674 mSDsCounter, 0 mSdLazyCounter, 753 mSolverCounterSat, 272 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 952 SdHoareTripleChecker+Valid, 1095 SdHoareTripleChecker+Invalid, 1025 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 272 IncrementalHoareTripleChecker+Valid, 753 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2023-11-21 19:03:08,157 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [952 Valid, 1095 Invalid, 1025 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [272 Valid, 753 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2023-11-21 19:03:08,162 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 445 states. [2023-11-21 19:03:08,230 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 445 to 360. [2023-11-21 19:03:08,232 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 360 states, 269 states have (on average 1.3866171003717471) internal successors, (373), 274 states have internal predecessors, (373), 62 states have call successors, (62), 29 states have call predecessors, (62), 27 states have return successors, (58), 58 states have call predecessors, (58), 58 states have call successors, (58) [2023-11-21 19:03:08,236 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 360 states to 360 states and 493 transitions. [2023-11-21 19:03:08,237 INFO L78 Accepts]: Start accepts. Automaton has 360 states and 493 transitions. Word has length 45 [2023-11-21 19:03:08,238 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 19:03:08,239 INFO L495 AbstractCegarLoop]: Abstraction has 360 states and 493 transitions. [2023-11-21 19:03:08,242 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 5.0) internal successors, (30), 6 states have internal predecessors, (30), 4 states have call successors, (8), 2 states have call predecessors, (8), 4 states have return successors, (7), 4 states have call predecessors, (7), 4 states have call successors, (7) [2023-11-21 19:03:08,243 INFO L276 IsEmpty]: Start isEmpty. Operand 360 states and 493 transitions. [2023-11-21 19:03:08,252 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2023-11-21 19:03:08,253 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:03:08,254 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 19:03:08,255 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-11-21 19:03:08,257 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-21 19:03:08,257 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:03:08,258 INFO L85 PathProgramCache]: Analyzing trace with hash -819987586, now seen corresponding path program 1 times [2023-11-21 19:03:08,259 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:03:08,259 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1896688941] [2023-11-21 19:03:08,259 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:03:08,260 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:03:08,302 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:03:08,696 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 19:03:08,696 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:03:08,696 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1896688941] [2023-11-21 19:03:08,697 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1896688941] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-21 19:03:08,697 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-21 19:03:08,697 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2023-11-21 19:03:08,697 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [296343594] [2023-11-21 19:03:08,697 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-21 19:03:08,698 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-11-21 19:03:08,698 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-21 19:03:08,699 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-11-21 19:03:08,699 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2023-11-21 19:03:08,699 INFO L87 Difference]: Start difference. First operand 360 states and 493 transitions. Second operand has 8 states, 7 states have (on average 4.428571428571429) internal successors, (31), 7 states have internal predecessors, (31), 4 states have call successors, (8), 3 states have call predecessors, (8), 3 states have return successors, (7), 4 states have call predecessors, (7), 3 states have call successors, (7) [2023-11-21 19:03:09,752 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 19:03:09,752 INFO L93 Difference]: Finished difference Result 662 states and 861 transitions. [2023-11-21 19:03:09,753 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2023-11-21 19:03:09,753 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 4.428571428571429) internal successors, (31), 7 states have internal predecessors, (31), 4 states have call successors, (8), 3 states have call predecessors, (8), 3 states have return successors, (7), 4 states have call predecessors, (7), 3 states have call successors, (7) Word has length 46 [2023-11-21 19:03:09,754 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 19:03:09,758 INFO L225 Difference]: With dead ends: 662 [2023-11-21 19:03:09,758 INFO L226 Difference]: Without dead ends: 488 [2023-11-21 19:03:09,759 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=90, Invalid=216, Unknown=0, NotChecked=0, Total=306 [2023-11-21 19:03:09,761 INFO L413 NwaCegarLoop]: 209 mSDtfsCounter, 526 mSDsluCounter, 896 mSDsCounter, 0 mSdLazyCounter, 1075 mSolverCounterSat, 101 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 557 SdHoareTripleChecker+Valid, 1105 SdHoareTripleChecker+Invalid, 1176 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 101 IncrementalHoareTripleChecker+Valid, 1075 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2023-11-21 19:03:09,762 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [557 Valid, 1105 Invalid, 1176 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [101 Valid, 1075 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2023-11-21 19:03:09,764 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 488 states. [2023-11-21 19:03:09,810 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 488 to 462. [2023-11-21 19:03:09,812 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 462 states, 337 states have (on average 1.3501483679525224) internal successors, (455), 342 states have internal predecessors, (455), 82 states have call successors, (82), 43 states have call predecessors, (82), 41 states have return successors, (78), 78 states have call predecessors, (78), 78 states have call successors, (78) [2023-11-21 19:03:09,815 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 462 states to 462 states and 615 transitions. [2023-11-21 19:03:09,815 INFO L78 Accepts]: Start accepts. Automaton has 462 states and 615 transitions. Word has length 46 [2023-11-21 19:03:09,816 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 19:03:09,816 INFO L495 AbstractCegarLoop]: Abstraction has 462 states and 615 transitions. [2023-11-21 19:03:09,816 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 4.428571428571429) internal successors, (31), 7 states have internal predecessors, (31), 4 states have call successors, (8), 3 states have call predecessors, (8), 3 states have return successors, (7), 4 states have call predecessors, (7), 3 states have call successors, (7) [2023-11-21 19:03:09,817 INFO L276 IsEmpty]: Start isEmpty. Operand 462 states and 615 transitions. [2023-11-21 19:03:09,838 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2023-11-21 19:03:09,838 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:03:09,838 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 19:03:09,838 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2023-11-21 19:03:09,839 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-21 19:03:09,840 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:03:09,840 INFO L85 PathProgramCache]: Analyzing trace with hash -2069530293, now seen corresponding path program 1 times [2023-11-21 19:03:09,840 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:03:09,840 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1979744854] [2023-11-21 19:03:09,841 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:03:09,841 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:03:09,860 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:03:09,896 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 19:03:09,896 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:03:09,897 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1979744854] [2023-11-21 19:03:09,897 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1979744854] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-21 19:03:09,897 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-21 19:03:09,897 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-21 19:03:09,898 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1744116378] [2023-11-21 19:03:09,898 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-21 19:03:09,898 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-21 19:03:09,899 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-21 19:03:09,899 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-21 19:03:09,899 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-21 19:03:09,900 INFO L87 Difference]: Start difference. First operand 462 states and 615 transitions. Second operand has 3 states, 3 states have (on average 10.666666666666666) internal successors, (32), 3 states have internal predecessors, (32), 3 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-11-21 19:03:10,027 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 19:03:10,027 INFO L93 Difference]: Finished difference Result 727 states and 951 transitions. [2023-11-21 19:03:10,028 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-21 19:03:10,028 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 10.666666666666666) internal successors, (32), 3 states have internal predecessors, (32), 3 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 47 [2023-11-21 19:03:10,029 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 19:03:10,030 INFO L225 Difference]: With dead ends: 727 [2023-11-21 19:03:10,030 INFO L226 Difference]: Without dead ends: 181 [2023-11-21 19:03:10,032 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 [2023-11-21 19:03:10,033 INFO L413 NwaCegarLoop]: 296 mSDtfsCounter, 340 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 60 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 340 SdHoareTripleChecker+Valid, 296 SdHoareTripleChecker+Invalid, 62 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 60 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-21 19:03:10,034 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [340 Valid, 296 Invalid, 62 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 60 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-21 19:03:10,035 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 181 states. [2023-11-21 19:03:10,049 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 181 to 181. [2023-11-21 19:03:10,049 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 181 states, 148 states have (on average 1.4864864864864864) internal successors, (220), 150 states have internal predecessors, (220), 26 states have call successors, (26), 7 states have call predecessors, (26), 6 states have return successors, (24), 24 states have call predecessors, (24), 24 states have call successors, (24) [2023-11-21 19:03:10,051 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 181 states to 181 states and 270 transitions. [2023-11-21 19:03:10,052 INFO L78 Accepts]: Start accepts. Automaton has 181 states and 270 transitions. Word has length 47 [2023-11-21 19:03:10,052 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 19:03:10,052 INFO L495 AbstractCegarLoop]: Abstraction has 181 states and 270 transitions. [2023-11-21 19:03:10,052 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 10.666666666666666) internal successors, (32), 3 states have internal predecessors, (32), 3 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-11-21 19:03:10,053 INFO L276 IsEmpty]: Start isEmpty. Operand 181 states and 270 transitions. [2023-11-21 19:03:10,054 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2023-11-21 19:03:10,054 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:03:10,054 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 19:03:10,054 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2023-11-21 19:03:10,055 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-21 19:03:10,055 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:03:10,055 INFO L85 PathProgramCache]: Analyzing trace with hash 1087810920, now seen corresponding path program 1 times [2023-11-21 19:03:10,055 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:03:10,056 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2007331168] [2023-11-21 19:03:10,056 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:03:10,056 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:03:10,085 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:03:10,236 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 19:03:10,237 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:03:10,237 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2007331168] [2023-11-21 19:03:10,237 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2007331168] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-21 19:03:10,239 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-21 19:03:10,239 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-11-21 19:03:10,239 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [732615194] [2023-11-21 19:03:10,239 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-21 19:03:10,241 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-21 19:03:10,241 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-21 19:03:10,241 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-21 19:03:10,242 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-11-21 19:03:10,242 INFO L87 Difference]: Start difference. First operand 181 states and 270 transitions. Second operand has 5 states, 5 states have (on average 10.2) internal successors, (51), 5 states have internal predecessors, (51), 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) [2023-11-21 19:03:11,058 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 19:03:11,058 INFO L93 Difference]: Finished difference Result 1014 states and 1606 transitions. [2023-11-21 19:03:11,059 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-21 19:03:11,059 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 10.2) internal successors, (51), 5 states have internal predecessors, (51), 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 62 [2023-11-21 19:03:11,059 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 19:03:11,066 INFO L225 Difference]: With dead ends: 1014 [2023-11-21 19:03:11,067 INFO L226 Difference]: Without dead ends: 839 [2023-11-21 19:03:11,068 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2023-11-21 19:03:11,069 INFO L413 NwaCegarLoop]: 421 mSDtfsCounter, 1203 mSDsluCounter, 740 mSDsCounter, 0 mSdLazyCounter, 463 mSolverCounterSat, 181 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1204 SdHoareTripleChecker+Valid, 1161 SdHoareTripleChecker+Invalid, 644 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 181 IncrementalHoareTripleChecker+Valid, 463 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2023-11-21 19:03:11,070 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1204 Valid, 1161 Invalid, 644 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [181 Valid, 463 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2023-11-21 19:03:11,072 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 839 states. [2023-11-21 19:03:11,161 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 839 to 826. [2023-11-21 19:03:11,166 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 826 states, 692 states have (on average 1.4797687861271676) internal successors, (1024), 697 states have internal predecessors, (1024), 103 states have call successors, (103), 31 states have call predecessors, (103), 30 states have return successors, (155), 98 states have call predecessors, (155), 101 states have call successors, (155) [2023-11-21 19:03:11,173 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 826 states to 826 states and 1282 transitions. [2023-11-21 19:03:11,173 INFO L78 Accepts]: Start accepts. Automaton has 826 states and 1282 transitions. Word has length 62 [2023-11-21 19:03:11,173 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 19:03:11,174 INFO L495 AbstractCegarLoop]: Abstraction has 826 states and 1282 transitions. [2023-11-21 19:03:11,174 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 10.2) internal successors, (51), 5 states have internal predecessors, (51), 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) [2023-11-21 19:03:11,174 INFO L276 IsEmpty]: Start isEmpty. Operand 826 states and 1282 transitions. [2023-11-21 19:03:11,178 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2023-11-21 19:03:11,178 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:03:11,178 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 19:03:11,184 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2023-11-21 19:03:11,186 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-21 19:03:11,186 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:03:11,187 INFO L85 PathProgramCache]: Analyzing trace with hash -677334081, now seen corresponding path program 1 times [2023-11-21 19:03:11,187 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:03:11,187 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1393343406] [2023-11-21 19:03:11,187 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:03:11,187 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:03:11,230 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:03:11,437 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 0 proven. 33 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2023-11-21 19:03:11,438 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:03:11,438 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1393343406] [2023-11-21 19:03:11,438 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1393343406] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-21 19:03:11,438 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [668477640] [2023-11-21 19:03:11,438 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:03:11,439 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:03:11,439 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_476983e8-cf6d-4a5d-8b08-f92d47554185/bin/utaipan-verify-QoSU8krkJ5/z3 [2023-11-21 19:03:11,443 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_476983e8-cf6d-4a5d-8b08-f92d47554185/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-21 19:03:11,480 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_476983e8-cf6d-4a5d-8b08-f92d47554185/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-21 19:03:11,724 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:03:11,730 INFO L262 TraceCheckSpWp]: Trace formula consists of 916 conjuncts, 2 conjunts are in the unsatisfiable core [2023-11-21 19:03:11,740 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-21 19:03:11,817 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2023-11-21 19:03:11,822 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-21 19:03:11,823 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [668477640] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-21 19:03:11,823 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-21 19:03:11,823 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2023-11-21 19:03:11,823 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [291670743] [2023-11-21 19:03:11,824 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-21 19:03:11,824 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-21 19:03:11,826 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-21 19:03:11,826 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-21 19:03:11,827 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-21 19:03:11,827 INFO L87 Difference]: Start difference. First operand 826 states and 1282 transitions. Second operand has 3 states, 3 states have (on average 26.0) internal successors, (78), 2 states have internal predecessors, (78), 2 states have call successors, (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) [2023-11-21 19:03:12,087 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 19:03:12,088 INFO L93 Difference]: Finished difference Result 2450 states and 3910 transitions. [2023-11-21 19:03:12,088 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-21 19:03:12,089 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 26.0) internal successors, (78), 2 states have internal predecessors, (78), 2 states have call successors, (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 124 [2023-11-21 19:03:12,089 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 19:03:12,101 INFO L225 Difference]: With dead ends: 2450 [2023-11-21 19:03:12,101 INFO L226 Difference]: Without dead ends: 1630 [2023-11-21 19:03:12,107 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 128 GetRequests, 124 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-21 19:03:12,108 INFO L413 NwaCegarLoop]: 228 mSDtfsCounter, 242 mSDsluCounter, 214 mSDsCounter, 0 mSdLazyCounter, 91 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 242 SdHoareTripleChecker+Valid, 442 SdHoareTripleChecker+Invalid, 93 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 91 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-21 19:03:12,108 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [242 Valid, 442 Invalid, 93 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 91 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-21 19:03:12,111 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1630 states. [2023-11-21 19:03:12,233 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1630 to 1621. [2023-11-21 19:03:12,237 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1621 states, 1365 states have (on average 1.4754578754578755) internal successors, (2014), 1373 states have internal predecessors, (2014), 195 states have call successors, (195), 61 states have call predecessors, (195), 60 states have return successors, (297), 187 states have call predecessors, (297), 193 states have call successors, (297) [2023-11-21 19:03:12,285 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1621 states to 1621 states and 2506 transitions. [2023-11-21 19:03:12,286 INFO L78 Accepts]: Start accepts. Automaton has 1621 states and 2506 transitions. Word has length 124 [2023-11-21 19:03:12,287 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 19:03:12,287 INFO L495 AbstractCegarLoop]: Abstraction has 1621 states and 2506 transitions. [2023-11-21 19:03:12,288 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 26.0) internal successors, (78), 2 states have internal predecessors, (78), 2 states have call successors, (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) [2023-11-21 19:03:12,288 INFO L276 IsEmpty]: Start isEmpty. Operand 1621 states and 2506 transitions. [2023-11-21 19:03:12,294 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2023-11-21 19:03:12,295 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:03:12,295 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 19:03:12,325 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_476983e8-cf6d-4a5d-8b08-f92d47554185/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-11-21 19:03:12,516 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_476983e8-cf6d-4a5d-8b08-f92d47554185/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2023-11-21 19:03:12,517 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-21 19:03:12,517 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:03:12,517 INFO L85 PathProgramCache]: Analyzing trace with hash 2106201631, now seen corresponding path program 1 times [2023-11-21 19:03:12,517 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:03:12,517 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1775105959] [2023-11-21 19:03:12,518 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:03:12,518 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:03:12,557 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:03:12,747 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 0 proven. 33 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2023-11-21 19:03:12,748 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:03:12,748 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1775105959] [2023-11-21 19:03:12,748 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1775105959] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-21 19:03:12,750 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1802797460] [2023-11-21 19:03:12,751 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:03:12,751 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:03:12,751 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_476983e8-cf6d-4a5d-8b08-f92d47554185/bin/utaipan-verify-QoSU8krkJ5/z3 [2023-11-21 19:03:12,752 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_476983e8-cf6d-4a5d-8b08-f92d47554185/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-21 19:03:12,767 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_476983e8-cf6d-4a5d-8b08-f92d47554185/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-21 19:03:12,998 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:03:13,002 INFO L262 TraceCheckSpWp]: Trace formula consists of 910 conjuncts, 2 conjunts are in the unsatisfiable core [2023-11-21 19:03:13,009 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-21 19:03:13,103 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 32 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-11-21 19:03:13,104 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-21 19:03:13,104 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1802797460] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-21 19:03:13,104 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-21 19:03:13,105 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2023-11-21 19:03:13,105 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [568077570] [2023-11-21 19:03:13,105 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-21 19:03:13,106 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-21 19:03:13,106 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-21 19:03:13,107 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-21 19:03:13,107 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-21 19:03:13,107 INFO L87 Difference]: Start difference. First operand 1621 states and 2506 transitions. Second operand has 3 states, 3 states have (on average 33.0) internal successors, (99), 2 states have internal predecessors, (99), 2 states have call successors, (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) [2023-11-21 19:03:13,455 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 19:03:13,455 INFO L93 Difference]: Finished difference Result 4820 states and 7656 transitions. [2023-11-21 19:03:13,456 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-21 19:03:13,456 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 33.0) internal successors, (99), 2 states have internal predecessors, (99), 2 states have call successors, (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 124 [2023-11-21 19:03:13,456 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 19:03:13,479 INFO L225 Difference]: With dead ends: 4820 [2023-11-21 19:03:13,479 INFO L226 Difference]: Without dead ends: 3205 [2023-11-21 19:03:13,487 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 128 GetRequests, 124 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-21 19:03:13,488 INFO L413 NwaCegarLoop]: 223 mSDtfsCounter, 221 mSDsluCounter, 214 mSDsCounter, 0 mSdLazyCounter, 91 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 221 SdHoareTripleChecker+Valid, 437 SdHoareTripleChecker+Invalid, 93 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 91 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-21 19:03:13,488 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [221 Valid, 437 Invalid, 93 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 91 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-21 19:03:13,492 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3205 states. [2023-11-21 19:03:13,710 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3205 to 3191. [2023-11-21 19:03:13,717 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3191 states, 2696 states have (on average 1.470326409495549) internal successors, (3964), 2710 states have internal predecessors, (3964), 374 states have call successors, (374), 121 states have call predecessors, (374), 120 states have return successors, (572), 360 states have call predecessors, (572), 372 states have call successors, (572) [2023-11-21 19:03:13,744 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3191 states to 3191 states and 4910 transitions. [2023-11-21 19:03:13,745 INFO L78 Accepts]: Start accepts. Automaton has 3191 states and 4910 transitions. Word has length 124 [2023-11-21 19:03:13,745 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 19:03:13,745 INFO L495 AbstractCegarLoop]: Abstraction has 3191 states and 4910 transitions. [2023-11-21 19:03:13,745 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 33.0) internal successors, (99), 2 states have internal predecessors, (99), 2 states have call successors, (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) [2023-11-21 19:03:13,745 INFO L276 IsEmpty]: Start isEmpty. Operand 3191 states and 4910 transitions. [2023-11-21 19:03:13,753 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2023-11-21 19:03:13,753 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:03:13,753 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 19:03:13,779 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_476983e8-cf6d-4a5d-8b08-f92d47554185/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-11-21 19:03:13,974 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_476983e8-cf6d-4a5d-8b08-f92d47554185/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2023-11-21 19:03:13,974 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-21 19:03:13,975 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:03:13,975 INFO L85 PathProgramCache]: Analyzing trace with hash 1625028543, now seen corresponding path program 1 times [2023-11-21 19:03:13,975 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:03:13,975 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1646591642] [2023-11-21 19:03:13,975 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:03:13,975 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:03:14,017 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:03:14,162 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 0 proven. 33 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2023-11-21 19:03:14,162 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:03:14,163 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1646591642] [2023-11-21 19:03:14,163 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1646591642] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-21 19:03:14,165 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1345778726] [2023-11-21 19:03:14,165 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:03:14,165 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:03:14,165 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_476983e8-cf6d-4a5d-8b08-f92d47554185/bin/utaipan-verify-QoSU8krkJ5/z3 [2023-11-21 19:03:14,166 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_476983e8-cf6d-4a5d-8b08-f92d47554185/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-21 19:03:14,188 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_476983e8-cf6d-4a5d-8b08-f92d47554185/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-21 19:03:14,402 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:03:14,406 INFO L262 TraceCheckSpWp]: Trace formula consists of 904 conjuncts, 2 conjunts are in the unsatisfiable core [2023-11-21 19:03:14,414 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-21 19:03:14,469 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 14 proven. 0 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2023-11-21 19:03:14,469 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-21 19:03:14,470 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1345778726] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-21 19:03:14,470 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-21 19:03:14,470 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2023-11-21 19:03:14,470 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [354387269] [2023-11-21 19:03:14,470 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-21 19:03:14,471 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-21 19:03:14,471 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-21 19:03:14,472 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-21 19:03:14,472 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-21 19:03:14,472 INFO L87 Difference]: Start difference. First operand 3191 states and 4910 transitions. Second operand has 3 states, 3 states have (on average 27.0) internal successors, (81), 2 states have internal predecessors, (81), 2 states have call successors, (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) [2023-11-21 19:03:14,980 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 19:03:14,981 INFO L93 Difference]: Finished difference Result 9500 states and 15007 transitions. [2023-11-21 19:03:14,981 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-21 19:03:14,981 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 27.0) internal successors, (81), 2 states have internal predecessors, (81), 2 states have call successors, (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 124 [2023-11-21 19:03:14,982 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 19:03:15,035 INFO L225 Difference]: With dead ends: 9500 [2023-11-21 19:03:15,036 INFO L226 Difference]: Without dead ends: 6315 [2023-11-21 19:03:15,056 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 128 GetRequests, 124 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-21 19:03:15,058 INFO L413 NwaCegarLoop]: 223 mSDtfsCounter, 239 mSDsluCounter, 214 mSDsCounter, 0 mSdLazyCounter, 91 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 239 SdHoareTripleChecker+Valid, 437 SdHoareTripleChecker+Invalid, 93 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 91 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-21 19:03:15,058 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [239 Valid, 437 Invalid, 93 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 91 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-21 19:03:15,067 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6315 states. [2023-11-21 19:03:15,602 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6315 to 6291. [2023-11-21 19:03:15,616 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 6291 states, 5328 states have (on average 1.4647147147147148) internal successors, (7804), 5354 states have internal predecessors, (7804), 722 states have call successors, (722), 241 states have call predecessors, (722), 240 states have return successors, (1104), 696 states have call predecessors, (1104), 720 states have call successors, (1104) [2023-11-21 19:03:15,655 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6291 states to 6291 states and 9630 transitions. [2023-11-21 19:03:15,656 INFO L78 Accepts]: Start accepts. Automaton has 6291 states and 9630 transitions. Word has length 124 [2023-11-21 19:03:15,656 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 19:03:15,656 INFO L495 AbstractCegarLoop]: Abstraction has 6291 states and 9630 transitions. [2023-11-21 19:03:15,657 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 27.0) internal successors, (81), 2 states have internal predecessors, (81), 2 states have call successors, (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) [2023-11-21 19:03:15,657 INFO L276 IsEmpty]: Start isEmpty. Operand 6291 states and 9630 transitions. [2023-11-21 19:03:15,669 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2023-11-21 19:03:15,669 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:03:15,670 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 19:03:15,696 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_476983e8-cf6d-4a5d-8b08-f92d47554185/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-11-21 19:03:15,891 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_476983e8-cf6d-4a5d-8b08-f92d47554185/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:03:15,891 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-21 19:03:15,892 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:03:15,892 INFO L85 PathProgramCache]: Analyzing trace with hash -1135300257, now seen corresponding path program 1 times [2023-11-21 19:03:15,892 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:03:15,892 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1295264718] [2023-11-21 19:03:15,892 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:03:15,893 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:03:15,925 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:03:16,110 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 0 proven. 33 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2023-11-21 19:03:16,110 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:03:16,110 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1295264718] [2023-11-21 19:03:16,110 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1295264718] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-21 19:03:16,110 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [383721989] [2023-11-21 19:03:16,111 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:03:16,111 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:03:16,111 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_476983e8-cf6d-4a5d-8b08-f92d47554185/bin/utaipan-verify-QoSU8krkJ5/z3 [2023-11-21 19:03:16,112 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_476983e8-cf6d-4a5d-8b08-f92d47554185/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-21 19:03:16,132 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_476983e8-cf6d-4a5d-8b08-f92d47554185/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-11-21 19:03:16,344 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:03:16,348 INFO L262 TraceCheckSpWp]: Trace formula consists of 898 conjuncts, 2 conjunts are in the unsatisfiable core [2023-11-21 19:03:16,352 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-21 19:03:16,418 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 26 proven. 0 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2023-11-21 19:03:16,418 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-21 19:03:16,419 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [383721989] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-21 19:03:16,419 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-21 19:03:16,419 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2023-11-21 19:03:16,419 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1207655379] [2023-11-21 19:03:16,419 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-21 19:03:16,420 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-21 19:03:16,420 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-21 19:03:16,420 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-21 19:03:16,421 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-21 19:03:16,421 INFO L87 Difference]: Start difference. First operand 6291 states and 9630 transitions. Second operand has 3 states, 3 states have (on average 31.0) internal successors, (93), 2 states have internal predecessors, (93), 2 states have call successors, (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) [2023-11-21 19:03:17,237 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 19:03:17,238 INFO L93 Difference]: Finished difference Result 18740 states and 29427 transitions. [2023-11-21 19:03:17,238 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-21 19:03:17,238 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 31.0) internal successors, (93), 2 states have internal predecessors, (93), 2 states have call successors, (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 124 [2023-11-21 19:03:17,240 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 19:03:17,355 INFO L225 Difference]: With dead ends: 18740 [2023-11-21 19:03:17,356 INFO L226 Difference]: Without dead ends: 12455 [2023-11-21 19:03:17,386 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 128 GetRequests, 124 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-21 19:03:17,388 INFO L413 NwaCegarLoop]: 223 mSDtfsCounter, 227 mSDsluCounter, 214 mSDsCounter, 0 mSdLazyCounter, 91 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 227 SdHoareTripleChecker+Valid, 437 SdHoareTripleChecker+Invalid, 93 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 91 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-21 19:03:17,389 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [227 Valid, 437 Invalid, 93 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 91 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-21 19:03:17,405 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12455 states. [2023-11-21 19:03:18,457 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12455 to 12411. [2023-11-21 19:03:18,501 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 12411 states, 10532 states have (on average 1.4587922521838208) internal successors, (15364), 10582 states have internal predecessors, (15364), 1398 states have call successors, (1398), 481 states have call predecessors, (1398), 480 states have return successors, (2132), 1348 states have call predecessors, (2132), 1396 states have call successors, (2132) [2023-11-21 19:03:18,556 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12411 states to 12411 states and 18894 transitions. [2023-11-21 19:03:18,557 INFO L78 Accepts]: Start accepts. Automaton has 12411 states and 18894 transitions. Word has length 124 [2023-11-21 19:03:18,557 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 19:03:18,558 INFO L495 AbstractCegarLoop]: Abstraction has 12411 states and 18894 transitions. [2023-11-21 19:03:18,559 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 31.0) internal successors, (93), 2 states have internal predecessors, (93), 2 states have call successors, (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) [2023-11-21 19:03:18,559 INFO L276 IsEmpty]: Start isEmpty. Operand 12411 states and 18894 transitions. [2023-11-21 19:03:18,579 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2023-11-21 19:03:18,579 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:03:18,579 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 19:03:18,610 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_476983e8-cf6d-4a5d-8b08-f92d47554185/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-11-21 19:03:18,792 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_476983e8-cf6d-4a5d-8b08-f92d47554185/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2023-11-21 19:03:18,792 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-21 19:03:18,792 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:03:18,793 INFO L85 PathProgramCache]: Analyzing trace with hash -1998660865, now seen corresponding path program 1 times [2023-11-21 19:03:18,793 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:03:18,793 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [242371512] [2023-11-21 19:03:18,793 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:03:18,793 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:03:18,832 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:03:18,988 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 0 proven. 33 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2023-11-21 19:03:18,989 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:03:18,989 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [242371512] [2023-11-21 19:03:18,989 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [242371512] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-21 19:03:18,989 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1583842581] [2023-11-21 19:03:18,990 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:03:18,990 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:03:18,990 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_476983e8-cf6d-4a5d-8b08-f92d47554185/bin/utaipan-verify-QoSU8krkJ5/z3 [2023-11-21 19:03:18,991 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_476983e8-cf6d-4a5d-8b08-f92d47554185/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-21 19:03:19,016 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_476983e8-cf6d-4a5d-8b08-f92d47554185/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-11-21 19:03:19,232 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:03:19,236 INFO L262 TraceCheckSpWp]: Trace formula consists of 892 conjuncts, 2 conjunts are in the unsatisfiable core [2023-11-21 19:03:19,242 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-21 19:03:19,291 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 20 proven. 0 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2023-11-21 19:03:19,292 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-21 19:03:19,292 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1583842581] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-21 19:03:19,292 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-21 19:03:19,292 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2023-11-21 19:03:19,292 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [881057456] [2023-11-21 19:03:19,293 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-21 19:03:19,293 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-21 19:03:19,293 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-21 19:03:19,294 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-21 19:03:19,294 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-21 19:03:19,294 INFO L87 Difference]: Start difference. First operand 12411 states and 18894 transitions. Second operand has 3 states, 3 states have (on average 29.0) internal successors, (87), 2 states have internal predecessors, (87), 2 states have call successors, (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) [2023-11-21 19:03:20,609 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 19:03:20,610 INFO L93 Difference]: Finished difference Result 36980 states and 57703 transitions. [2023-11-21 19:03:20,610 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-21 19:03:20,611 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 29.0) internal successors, (87), 2 states have internal predecessors, (87), 2 states have call successors, (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 124 [2023-11-21 19:03:20,611 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 19:03:20,748 INFO L225 Difference]: With dead ends: 36980 [2023-11-21 19:03:20,748 INFO L226 Difference]: Without dead ends: 24575 [2023-11-21 19:03:20,810 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 128 GetRequests, 124 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-21 19:03:20,811 INFO L413 NwaCegarLoop]: 223 mSDtfsCounter, 233 mSDsluCounter, 214 mSDsCounter, 0 mSdLazyCounter, 91 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 233 SdHoareTripleChecker+Valid, 437 SdHoareTripleChecker+Invalid, 93 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 91 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-21 19:03:20,813 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [233 Valid, 437 Invalid, 93 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 91 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-21 19:03:20,844 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24575 states. [2023-11-21 19:03:22,574 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24575 to 24491. [2023-11-21 19:03:22,611 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24491 states, 20820 states have (on average 1.4526416906820365) internal successors, (30244), 20918 states have internal predecessors, (30244), 2710 states have call successors, (2710), 961 states have call predecessors, (2710), 960 states have return successors, (4116), 2612 states have call predecessors, (4116), 2708 states have call successors, (4116) [2023-11-21 19:03:22,839 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24491 states to 24491 states and 37070 transitions. [2023-11-21 19:03:22,841 INFO L78 Accepts]: Start accepts. Automaton has 24491 states and 37070 transitions. Word has length 124 [2023-11-21 19:03:22,841 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 19:03:22,841 INFO L495 AbstractCegarLoop]: Abstraction has 24491 states and 37070 transitions. [2023-11-21 19:03:22,842 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 29.0) internal successors, (87), 2 states have internal predecessors, (87), 2 states have call successors, (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) [2023-11-21 19:03:22,842 INFO L276 IsEmpty]: Start isEmpty. Operand 24491 states and 37070 transitions. [2023-11-21 19:03:22,879 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2023-11-21 19:03:22,880 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:03:22,880 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 19:03:22,904 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_476983e8-cf6d-4a5d-8b08-f92d47554185/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-11-21 19:03:23,102 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_476983e8-cf6d-4a5d-8b08-f92d47554185/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2023-11-21 19:03:23,103 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-21 19:03:23,103 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:03:23,103 INFO L85 PathProgramCache]: Analyzing trace with hash 894127263, now seen corresponding path program 1 times [2023-11-21 19:03:23,103 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:03:23,104 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [255470210] [2023-11-21 19:03:23,104 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:03:23,104 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:03:23,164 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:03:23,689 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 37 trivial. 0 not checked. [2023-11-21 19:03:23,690 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:03:23,690 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [255470210] [2023-11-21 19:03:23,690 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [255470210] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-21 19:03:23,690 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-21 19:03:23,691 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2023-11-21 19:03:23,693 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [115158225] [2023-11-21 19:03:23,693 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-21 19:03:23,694 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-11-21 19:03:23,694 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-21 19:03:23,694 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-11-21 19:03:23,695 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2023-11-21 19:03:23,695 INFO L87 Difference]: Start difference. First operand 24491 states and 37070 transitions. Second operand has 6 states, 6 states have (on average 12.0) internal successors, (72), 6 states have internal predecessors, (72), 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) [2023-11-21 19:03:26,594 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 19:03:26,595 INFO L93 Difference]: Finished difference Result 65715 states and 100452 transitions. [2023-11-21 19:03:26,595 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2023-11-21 19:03:26,595 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 12.0) internal successors, (72), 6 states have internal predecessors, (72), 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 124 [2023-11-21 19:03:26,596 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 19:03:26,848 INFO L225 Difference]: With dead ends: 65715 [2023-11-21 19:03:26,848 INFO L226 Difference]: Without dead ends: 41231 [2023-11-21 19:03:26,932 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=41, Invalid=69, Unknown=0, NotChecked=0, Total=110 [2023-11-21 19:03:26,932 INFO L413 NwaCegarLoop]: 260 mSDtfsCounter, 692 mSDsluCounter, 640 mSDsCounter, 0 mSdLazyCounter, 382 mSolverCounterSat, 100 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 699 SdHoareTripleChecker+Valid, 900 SdHoareTripleChecker+Invalid, 482 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 100 IncrementalHoareTripleChecker+Valid, 382 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-11-21 19:03:26,933 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [699 Valid, 900 Invalid, 482 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [100 Valid, 382 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-11-21 19:03:26,982 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41231 states. [2023-11-21 19:03:29,510 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41231 to 38763. [2023-11-21 19:03:29,542 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38763 states, 32932 states have (on average 1.4460099599174057) internal successors, (47620), 33094 states have internal predecessors, (47620), 4294 states have call successors, (4294), 1537 states have call predecessors, (4294), 1536 states have return successors, (6708), 4132 states have call predecessors, (6708), 4292 states have call successors, (6708) [2023-11-21 19:03:29,699 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38763 states to 38763 states and 58622 transitions. [2023-11-21 19:03:29,702 INFO L78 Accepts]: Start accepts. Automaton has 38763 states and 58622 transitions. Word has length 124 [2023-11-21 19:03:29,703 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 19:03:29,703 INFO L495 AbstractCegarLoop]: Abstraction has 38763 states and 58622 transitions. [2023-11-21 19:03:29,703 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 12.0) internal successors, (72), 6 states have internal predecessors, (72), 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) [2023-11-21 19:03:29,703 INFO L276 IsEmpty]: Start isEmpty. Operand 38763 states and 58622 transitions. [2023-11-21 19:03:29,750 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 127 [2023-11-21 19:03:29,750 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:03:29,751 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 19:03:29,751 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2023-11-21 19:03:29,751 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-21 19:03:29,751 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:03:29,752 INFO L85 PathProgramCache]: Analyzing trace with hash 749487098, now seen corresponding path program 1 times [2023-11-21 19:03:29,752 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:03:29,752 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [640636382] [2023-11-21 19:03:29,752 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:03:29,752 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:03:29,792 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:03:30,361 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 37 trivial. 0 not checked. [2023-11-21 19:03:30,361 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:03:30,362 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [640636382] [2023-11-21 19:03:30,362 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [640636382] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-21 19:03:30,362 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-21 19:03:30,362 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2023-11-21 19:03:30,362 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [600667139] [2023-11-21 19:03:30,363 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-21 19:03:30,364 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-11-21 19:03:30,364 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-21 19:03:30,364 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-11-21 19:03:30,365 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2023-11-21 19:03:30,365 INFO L87 Difference]: Start difference. First operand 38763 states and 58622 transitions. Second operand has 6 states, 6 states have (on average 12.333333333333334) internal successors, (74), 6 states have internal predecessors, (74), 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) [2023-11-21 19:03:34,591 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 19:03:34,591 INFO L93 Difference]: Finished difference Result 98947 states and 151492 transitions. [2023-11-21 19:03:34,591 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2023-11-21 19:03:34,592 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 12.333333333333334) internal successors, (74), 6 states have internal predecessors, (74), 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 126 [2023-11-21 19:03:34,592 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 19:03:34,943 INFO L225 Difference]: With dead ends: 98947 [2023-11-21 19:03:34,943 INFO L226 Difference]: Without dead ends: 60191 [2023-11-21 19:03:35,077 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=41, Invalid=69, Unknown=0, NotChecked=0, Total=110 [2023-11-21 19:03:35,078 INFO L413 NwaCegarLoop]: 207 mSDtfsCounter, 720 mSDsluCounter, 536 mSDsCounter, 0 mSdLazyCounter, 310 mSolverCounterSat, 135 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 726 SdHoareTripleChecker+Valid, 743 SdHoareTripleChecker+Invalid, 445 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 135 IncrementalHoareTripleChecker+Valid, 310 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-11-21 19:03:35,079 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [726 Valid, 743 Invalid, 445 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [135 Valid, 310 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-11-21 19:03:35,146 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60191 states. [2023-11-21 19:03:39,644 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60191 to 57627. [2023-11-21 19:03:39,685 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 57627 states, 48948 states have (on average 1.4409577510827818) internal successors, (70532), 49190 states have internal predecessors, (70532), 6374 states have call successors, (6374), 2305 states have call predecessors, (6374), 2304 states have return successors, (9940), 6132 states have call predecessors, (9940), 6372 states have call successors, (9940) [2023-11-21 19:03:39,935 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57627 states to 57627 states and 86846 transitions. [2023-11-21 19:03:39,939 INFO L78 Accepts]: Start accepts. Automaton has 57627 states and 86846 transitions. Word has length 126 [2023-11-21 19:03:39,940 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 19:03:39,940 INFO L495 AbstractCegarLoop]: Abstraction has 57627 states and 86846 transitions. [2023-11-21 19:03:39,940 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 12.333333333333334) internal successors, (74), 6 states have internal predecessors, (74), 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) [2023-11-21 19:03:39,940 INFO L276 IsEmpty]: Start isEmpty. Operand 57627 states and 86846 transitions. [2023-11-21 19:03:39,994 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 129 [2023-11-21 19:03:39,995 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:03:39,995 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 19:03:39,995 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2023-11-21 19:03:39,995 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-21 19:03:39,997 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:03:39,997 INFO L85 PathProgramCache]: Analyzing trace with hash 1999969119, now seen corresponding path program 1 times [2023-11-21 19:03:39,997 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:03:39,997 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1290497677] [2023-11-21 19:03:39,997 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:03:39,997 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:03:40,033 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:03:40,518 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 37 trivial. 0 not checked. [2023-11-21 19:03:40,518 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:03:40,518 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1290497677] [2023-11-21 19:03:40,518 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1290497677] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-21 19:03:40,518 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-21 19:03:40,519 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2023-11-21 19:03:40,519 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1485219902] [2023-11-21 19:03:40,519 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-21 19:03:40,519 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-11-21 19:03:40,520 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-21 19:03:40,520 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-11-21 19:03:40,520 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2023-11-21 19:03:40,521 INFO L87 Difference]: Start difference. First operand 57627 states and 86846 transitions. Second operand has 6 states, 6 states have (on average 12.666666666666666) internal successors, (76), 6 states have internal predecessors, (76), 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)