./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/combinations/Problem05_label41+token_ring.01.cil-1.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 30e01a73 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_a61b6e24-04f0-4e3f-84a4-4bfa55a3d796/bin/utaipan-verify-mE87zJ7Ire/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a61b6e24-04f0-4e3f-84a4-4bfa55a3d796/bin/utaipan-verify-mE87zJ7Ire/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a61b6e24-04f0-4e3f-84a4-4bfa55a3d796/bin/utaipan-verify-mE87zJ7Ire/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a61b6e24-04f0-4e3f-84a4-4bfa55a3d796/bin/utaipan-verify-mE87zJ7Ire/config/TaipanReach.xml -i ../../sv-benchmarks/c/combinations/Problem05_label41+token_ring.01.cil-1.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a61b6e24-04f0-4e3f-84a4-4bfa55a3d796/bin/utaipan-verify-mE87zJ7Ire/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a61b6e24-04f0-4e3f-84a4-4bfa55a3d796/bin/utaipan-verify-mE87zJ7Ire --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 738a2e75c3974a334a4730af8ad8a1bca696e22b6aef9e5670f827b7767c7884 --- Real Ultimate output --- This is Ultimate 0.2.3-dev-30e01a7 [2023-11-23 21:26:50,403 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-23 21:26:50,514 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a61b6e24-04f0-4e3f-84a4-4bfa55a3d796/bin/utaipan-verify-mE87zJ7Ire/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-11-23 21:26:50,520 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-23 21:26:50,521 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-23 21:26:50,565 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-23 21:26:50,566 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-23 21:26:50,567 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-23 21:26:50,568 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-23 21:26:50,569 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-23 21:26:50,569 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-23 21:26:50,570 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-23 21:26:50,571 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-23 21:26:50,572 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-23 21:26:50,573 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-23 21:26:50,573 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-23 21:26:50,574 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-23 21:26:50,575 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-23 21:26:50,575 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-23 21:26:50,576 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-23 21:26:50,576 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-23 21:26:50,577 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-23 21:26:50,578 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-23 21:26:50,579 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-11-23 21:26:50,579 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-23 21:26:50,580 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-23 21:26:50,580 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-23 21:26:50,581 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-23 21:26:50,581 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-11-23 21:26:50,582 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-23 21:26:50,583 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-11-23 21:26:50,583 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-23 21:26:50,584 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-11-23 21:26:50,584 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-23 21:26:50,584 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-23 21:26:50,585 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-11-23 21:26:50,585 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-23 21:26:50,585 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-23 21:26:50,586 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-23 21:26:50,586 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-23 21:26:50,587 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-11-23 21:26:50,587 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-23 21:26:50,587 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-23 21:26:50,588 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-11-23 21:26:50,588 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-11-23 21:26:50,588 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-23 21:26:50,589 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-23 21:26:50,589 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_a61b6e24-04f0-4e3f-84a4-4bfa55a3d796/bin/utaipan-verify-mE87zJ7Ire/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a61b6e24-04f0-4e3f-84a4-4bfa55a3d796/bin/utaipan-verify-mE87zJ7Ire Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 738a2e75c3974a334a4730af8ad8a1bca696e22b6aef9e5670f827b7767c7884 [2023-11-23 21:26:51,026 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-23 21:26:51,081 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-23 21:26:51,084 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-23 21:26:51,087 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-23 21:26:51,088 INFO L274 PluginConnector]: CDTParser initialized [2023-11-23 21:26:51,090 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a61b6e24-04f0-4e3f-84a4-4bfa55a3d796/bin/utaipan-verify-mE87zJ7Ire/../../sv-benchmarks/c/combinations/Problem05_label41+token_ring.01.cil-1.c [2023-11-23 21:26:54,558 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-23 21:26:55,484 INFO L384 CDTParser]: Found 1 translation units. [2023-11-23 21:26:55,485 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a61b6e24-04f0-4e3f-84a4-4bfa55a3d796/sv-benchmarks/c/combinations/Problem05_label41+token_ring.01.cil-1.c [2023-11-23 21:26:55,547 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a61b6e24-04f0-4e3f-84a4-4bfa55a3d796/bin/utaipan-verify-mE87zJ7Ire/data/669360f40/63c7cd97c3d0421691f5857267ae2ed6/FLAGf24d1dfde [2023-11-23 21:26:55,569 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a61b6e24-04f0-4e3f-84a4-4bfa55a3d796/bin/utaipan-verify-mE87zJ7Ire/data/669360f40/63c7cd97c3d0421691f5857267ae2ed6 [2023-11-23 21:26:55,572 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-23 21:26:55,574 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-23 21:26:55,576 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-23 21:26:55,576 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-23 21:26:55,582 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-23 21:26:55,583 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 09:26:55" (1/1) ... [2023-11-23 21:26:55,585 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@ce7ec26 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:26:55, skipping insertion in model container [2023-11-23 21:26:55,585 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 09:26:55" (1/1) ... [2023-11-23 21:26:55,880 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-23 21:26:58,575 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_a61b6e24-04f0-4e3f-84a4-4bfa55a3d796/sv-benchmarks/c/combinations/Problem05_label41+token_ring.01.cil-1.c[376251,376264] [2023-11-23 21:26:58,614 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_a61b6e24-04f0-4e3f-84a4-4bfa55a3d796/sv-benchmarks/c/combinations/Problem05_label41+token_ring.01.cil-1.c[383339,383352] [2023-11-23 21:26:58,813 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-23 21:26:58,828 INFO L202 MainTranslator]: Completed pre-run [2023-11-23 21:27:00,289 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_a61b6e24-04f0-4e3f-84a4-4bfa55a3d796/sv-benchmarks/c/combinations/Problem05_label41+token_ring.01.cil-1.c[376251,376264] [2023-11-23 21:27:00,315 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_a61b6e24-04f0-4e3f-84a4-4bfa55a3d796/sv-benchmarks/c/combinations/Problem05_label41+token_ring.01.cil-1.c[383339,383352] [2023-11-23 21:27:00,349 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-23 21:27:00,439 INFO L206 MainTranslator]: Completed translation [2023-11-23 21:27:00,440 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:27:00 WrapperNode [2023-11-23 21:27:00,440 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-23 21:27:00,442 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-23 21:27:00,442 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-23 21:27:00,442 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-23 21:27:00,452 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:27:00" (1/1) ... [2023-11-23 21:27:00,555 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:27:00" (1/1) ... [2023-11-23 21:27:01,124 INFO L138 Inliner]: procedures = 46, calls = 44, calls flagged for inlining = 24, calls inlined = 24, statements flattened = 12568 [2023-11-23 21:27:01,125 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-23 21:27:01,126 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-23 21:27:01,126 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-23 21:27:01,126 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-23 21:27:01,138 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:27:00" (1/1) ... [2023-11-23 21:27:01,139 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:27:00" (1/1) ... [2023-11-23 21:27:01,214 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:27:00" (1/1) ... [2023-11-23 21:27:01,228 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:27:00" (1/1) ... [2023-11-23 21:27:01,517 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:27:00" (1/1) ... [2023-11-23 21:27:01,580 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:27:00" (1/1) ... [2023-11-23 21:27:01,645 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:27:00" (1/1) ... [2023-11-23 21:27:01,667 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:27:00" (1/1) ... [2023-11-23 21:27:01,807 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-23 21:27:01,807 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-23 21:27:01,807 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-23 21:27:01,808 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-23 21:27:01,808 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:27:00" (1/1) ... [2023-11-23 21:27:01,815 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-23 21:27:01,830 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a61b6e24-04f0-4e3f-84a4-4bfa55a3d796/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:27:01,855 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a61b6e24-04f0-4e3f-84a4-4bfa55a3d796/bin/utaipan-verify-mE87zJ7Ire/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-23 21:27:01,910 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-23 21:27:01,911 INFO L130 BoogieDeclarations]: Found specification of procedure fire_delta_events [2023-11-23 21:27:01,911 INFO L138 BoogieDeclarations]: Found implementation of procedure fire_delta_events [2023-11-23 21:27:01,911 INFO L130 BoogieDeclarations]: Found specification of procedure activate_threads [2023-11-23 21:27:01,911 INFO L138 BoogieDeclarations]: Found implementation of procedure activate_threads [2023-11-23 21:27:01,912 INFO L130 BoogieDeclarations]: Found specification of procedure immediate_notify [2023-11-23 21:27:01,912 INFO L138 BoogieDeclarations]: Found implementation of procedure immediate_notify [2023-11-23 21:27:01,912 INFO L130 BoogieDeclarations]: Found specification of procedure exists_runnable_thread [2023-11-23 21:27:01,912 INFO L138 BoogieDeclarations]: Found implementation of procedure exists_runnable_thread [2023-11-23 21:27:01,912 INFO L130 BoogieDeclarations]: Found specification of procedure reset_delta_events [2023-11-23 21:27:01,912 INFO L138 BoogieDeclarations]: Found implementation of procedure reset_delta_events [2023-11-23 21:27:01,913 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-23 21:27:01,913 INFO L130 BoogieDeclarations]: Found specification of procedure update_channels [2023-11-23 21:27:01,913 INFO L138 BoogieDeclarations]: Found implementation of procedure update_channels [2023-11-23 21:27:01,914 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-23 21:27:01,915 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-23 21:27:01,891 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a61b6e24-04f0-4e3f-84a4-4bfa55a3d796/bin/utaipan-verify-mE87zJ7Ire/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-23 21:27:02,077 INFO L241 CfgBuilder]: Building ICFG [2023-11-23 21:27:02,080 INFO L267 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-23 21:27:12,568 INFO L282 CfgBuilder]: Performing block encoding [2023-11-23 21:27:14,897 INFO L304 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-23 21:27:14,897 INFO L309 CfgBuilder]: Removed 5 assume(true) statements. [2023-11-23 21:27:14,900 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 09:27:14 BoogieIcfgContainer [2023-11-23 21:27:14,900 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-23 21:27:14,903 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-23 21:27:14,903 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-23 21:27:14,907 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-23 21:27:14,907 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 09:26:55" (1/3) ... [2023-11-23 21:27:14,908 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1abdd2d6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 09:27:14, skipping insertion in model container [2023-11-23 21:27:14,908 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:27:00" (2/3) ... [2023-11-23 21:27:14,908 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1abdd2d6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 09:27:14, skipping insertion in model container [2023-11-23 21:27:14,909 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 09:27:14" (3/3) ... [2023-11-23 21:27:14,910 INFO L112 eAbstractionObserver]: Analyzing ICFG Problem05_label41+token_ring.01.cil-1.c [2023-11-23 21:27:14,931 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-23 21:27:14,931 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 2 error locations. [2023-11-23 21:27:15,024 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-23 21:27:15,031 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;@498747c4, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-23 21:27:15,032 INFO L358 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2023-11-23 21:27:15,043 INFO L276 IsEmpty]: Start isEmpty. Operand has 1712 states, 1688 states have (on average 1.978080568720379) internal successors, (3339), 1691 states have internal predecessors, (3339), 15 states have call successors, (15), 6 states have call predecessors, (15), 6 states have return successors, (15), 15 states have call predecessors, (15), 15 states have call successors, (15) [2023-11-23 21:27:15,055 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2023-11-23 21:27:15,055 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:27:15,056 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] [2023-11-23 21:27:15,056 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:27:15,063 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:27:15,063 INFO L85 PathProgramCache]: Analyzing trace with hash 506430079, now seen corresponding path program 1 times [2023-11-23 21:27:15,075 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:27:15,075 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1718730749] [2023-11-23 21:27:15,076 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:27:15,076 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:27:15,214 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:27:15,481 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:27:15,482 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:27:15,483 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1718730749] [2023-11-23 21:27:15,484 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1718730749] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:27:15,484 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 21:27:15,484 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-11-23 21:27:15,486 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [454247426] [2023-11-23 21:27:15,487 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:27:15,497 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-23 21:27:15,497 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:27:15,545 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-23 21:27:15,546 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-23 21:27:15,555 INFO L87 Difference]: Start difference. First operand has 1712 states, 1688 states have (on average 1.978080568720379) internal successors, (3339), 1691 states have internal predecessors, (3339), 15 states have call successors, (15), 6 states have call predecessors, (15), 6 states have return successors, (15), 15 states have call predecessors, (15), 15 states have call successors, (15) Second operand has 4 states, 4 states have (on average 6.0) internal successors, (24), 4 states have internal predecessors, (24), 2 states have call successors, (5), 1 states have call predecessors, (5), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2023-11-23 21:27:16,502 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:27:16,503 INFO L93 Difference]: Finished difference Result 3476 states and 6817 transitions. [2023-11-23 21:27:16,504 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-23 21:27:16,505 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 6.0) internal successors, (24), 4 states have internal predecessors, (24), 2 states have call successors, (5), 1 states have call predecessors, (5), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) Word has length 34 [2023-11-23 21:27:16,506 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:27:16,539 INFO L225 Difference]: With dead ends: 3476 [2023-11-23 21:27:16,540 INFO L226 Difference]: Without dead ends: 1763 [2023-11-23 21:27:16,554 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 [2023-11-23 21:27:16,559 INFO L413 NwaCegarLoop]: 3185 mSDtfsCounter, 3420 mSDsluCounter, 3131 mSDsCounter, 0 mSdLazyCounter, 550 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3420 SdHoareTripleChecker+Valid, 6316 SdHoareTripleChecker+Invalid, 564 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 550 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2023-11-23 21:27:16,561 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3420 Valid, 6316 Invalid, 564 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [14 Valid, 550 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2023-11-23 21:27:16,587 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1763 states. [2023-11-23 21:27:16,732 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1763 to 1762. [2023-11-23 21:27:16,739 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1762 states, 1722 states have (on average 1.9581881533101044) internal successors, (3372), 1725 states have internal predecessors, (3372), 26 states have call successors, (26), 12 states have call predecessors, (26), 12 states have return successors, (26), 25 states have call predecessors, (26), 26 states have call successors, (26) [2023-11-23 21:27:16,752 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1762 states to 1762 states and 3424 transitions. [2023-11-23 21:27:16,754 INFO L78 Accepts]: Start accepts. Automaton has 1762 states and 3424 transitions. Word has length 34 [2023-11-23 21:27:16,754 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:27:16,754 INFO L495 AbstractCegarLoop]: Abstraction has 1762 states and 3424 transitions. [2023-11-23 21:27:16,755 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 6.0) internal successors, (24), 4 states have internal predecessors, (24), 2 states have call successors, (5), 1 states have call predecessors, (5), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2023-11-23 21:27:16,755 INFO L276 IsEmpty]: Start isEmpty. Operand 1762 states and 3424 transitions. [2023-11-23 21:27:16,759 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2023-11-23 21:27:16,759 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:27:16,759 INFO L195 NwaCegarLoop]: trace histogram [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] [2023-11-23 21:27:16,760 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-23 21:27:16,760 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:27:16,761 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:27:16,761 INFO L85 PathProgramCache]: Analyzing trace with hash -1690116064, now seen corresponding path program 1 times [2023-11-23 21:27:16,761 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:27:16,761 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1043175949] [2023-11-23 21:27:16,762 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:27:16,762 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:27:16,795 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:27:17,403 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-11-23 21:27:17,403 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:27:17,404 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1043175949] [2023-11-23 21:27:17,404 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1043175949] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:27:17,404 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 21:27:17,404 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2023-11-23 21:27:17,405 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1379129304] [2023-11-23 21:27:17,405 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:27:17,407 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-11-23 21:27:17,408 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:27:17,409 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-11-23 21:27:17,414 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2023-11-23 21:27:17,414 INFO L87 Difference]: Start difference. First operand 1762 states and 3424 transitions. Second operand has 6 states, 6 states have (on average 6.0) internal successors, (36), 6 states have internal predecessors, (36), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2023-11-23 21:27:18,410 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:27:18,411 INFO L93 Difference]: Finished difference Result 1990 states and 3712 transitions. [2023-11-23 21:27:18,411 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2023-11-23 21:27:18,412 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 6.0) internal successors, (36), 6 states have internal predecessors, (36), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) Word has length 60 [2023-11-23 21:27:18,412 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:27:18,427 INFO L225 Difference]: With dead ends: 1990 [2023-11-23 21:27:18,427 INFO L226 Difference]: Without dead ends: 1875 [2023-11-23 21:27:18,428 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=41, Invalid=69, Unknown=0, NotChecked=0, Total=110 [2023-11-23 21:27:18,429 INFO L413 NwaCegarLoop]: 3145 mSDtfsCounter, 3427 mSDsluCounter, 6218 mSDsCounter, 0 mSdLazyCounter, 769 mSolverCounterSat, 57 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3436 SdHoareTripleChecker+Valid, 9363 SdHoareTripleChecker+Invalid, 826 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.2s SdHoareTripleChecker+Time, 57 IncrementalHoareTripleChecker+Valid, 769 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2023-11-23 21:27:18,430 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3436 Valid, 9363 Invalid, 826 Unknown, 0 Unchecked, 0.2s Time], IncrementalHoareTripleChecker [57 Valid, 769 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2023-11-23 21:27:18,435 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1875 states. [2023-11-23 21:27:18,498 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1875 to 1863. [2023-11-23 21:27:18,503 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1863 states, 1791 states have (on average 1.9290898939140144) internal successors, (3455), 1795 states have internal predecessors, (3455), 46 states have call successors, (46), 24 states have call predecessors, (46), 24 states have return successors, (46), 44 states have call predecessors, (46), 46 states have call successors, (46) [2023-11-23 21:27:18,518 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1863 states to 1863 states and 3547 transitions. [2023-11-23 21:27:18,518 INFO L78 Accepts]: Start accepts. Automaton has 1863 states and 3547 transitions. Word has length 60 [2023-11-23 21:27:18,519 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:27:18,519 INFO L495 AbstractCegarLoop]: Abstraction has 1863 states and 3547 transitions. [2023-11-23 21:27:18,519 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 6.0) internal successors, (36), 6 states have internal predecessors, (36), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2023-11-23 21:27:18,520 INFO L276 IsEmpty]: Start isEmpty. Operand 1863 states and 3547 transitions. [2023-11-23 21:27:18,523 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2023-11-23 21:27:18,523 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:27:18,524 INFO L195 NwaCegarLoop]: trace histogram [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] [2023-11-23 21:27:18,524 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-11-23 21:27:18,524 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:27:18,525 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:27:18,525 INFO L85 PathProgramCache]: Analyzing trace with hash -573836101, now seen corresponding path program 1 times [2023-11-23 21:27:18,525 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:27:18,525 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1899305368] [2023-11-23 21:27:18,526 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:27:18,526 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:27:18,547 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:27:18,632 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-11-23 21:27:18,632 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:27:18,632 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1899305368] [2023-11-23 21:27:18,633 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1899305368] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:27:18,633 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 21:27:18,633 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-23 21:27:18,633 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1631377963] [2023-11-23 21:27:18,633 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:27:18,634 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-23 21:27:18,634 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:27:18,635 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-23 21:27:18,635 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-23 21:27:18,635 INFO L87 Difference]: Start difference. First operand 1863 states and 3547 transitions. Second operand has 3 states, 3 states have (on average 12.666666666666666) internal successors, (38), 3 states have internal predecessors, (38), 2 states have call successors, (8), 1 states have call predecessors, (8), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2023-11-23 21:27:19,207 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:27:19,207 INFO L93 Difference]: Finished difference Result 2031 states and 3757 transitions. [2023-11-23 21:27:19,213 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-23 21:27:19,213 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 12.666666666666666) internal successors, (38), 3 states have internal predecessors, (38), 2 states have call successors, (8), 1 states have call predecessors, (8), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) Word has length 62 [2023-11-23 21:27:19,214 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:27:19,230 INFO L225 Difference]: With dead ends: 2031 [2023-11-23 21:27:19,230 INFO L226 Difference]: Without dead ends: 1917 [2023-11-23 21:27:19,235 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 [2023-11-23 21:27:19,240 INFO L413 NwaCegarLoop]: 3159 mSDtfsCounter, 27 mSDsluCounter, 3127 mSDsCounter, 0 mSdLazyCounter, 464 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 27 SdHoareTripleChecker+Valid, 6286 SdHoareTripleChecker+Invalid, 464 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 464 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-11-23 21:27:19,241 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [27 Valid, 6286 Invalid, 464 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 464 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-11-23 21:27:19,247 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1917 states. [2023-11-23 21:27:19,324 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1917 to 1887. [2023-11-23 21:27:19,331 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1887 states, 1811 states have (on average 1.9221424627277748) internal successors, (3481), 1815 states have internal predecessors, (3481), 48 states have call successors, (48), 26 states have call predecessors, (48), 26 states have return successors, (48), 46 states have call predecessors, (48), 48 states have call successors, (48) [2023-11-23 21:27:19,346 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1887 states to 1887 states and 3577 transitions. [2023-11-23 21:27:19,347 INFO L78 Accepts]: Start accepts. Automaton has 1887 states and 3577 transitions. Word has length 62 [2023-11-23 21:27:19,349 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:27:19,349 INFO L495 AbstractCegarLoop]: Abstraction has 1887 states and 3577 transitions. [2023-11-23 21:27:19,349 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 12.666666666666666) internal successors, (38), 3 states have internal predecessors, (38), 2 states have call successors, (8), 1 states have call predecessors, (8), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2023-11-23 21:27:19,349 INFO L276 IsEmpty]: Start isEmpty. Operand 1887 states and 3577 transitions. [2023-11-23 21:27:19,355 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2023-11-23 21:27:19,355 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:27:19,356 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:27:19,357 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2023-11-23 21:27:19,357 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:27:19,358 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:27:19,358 INFO L85 PathProgramCache]: Analyzing trace with hash 351206585, now seen corresponding path program 1 times [2023-11-23 21:27:19,358 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:27:19,358 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [23256775] [2023-11-23 21:27:19,359 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:27:19,359 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:27:19,393 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:27:19,456 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2023-11-23 21:27:19,457 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:27:19,457 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [23256775] [2023-11-23 21:27:19,457 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [23256775] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:27:19,457 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 21:27:19,457 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-23 21:27:19,458 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [282747935] [2023-11-23 21:27:19,458 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:27:19,458 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-23 21:27:19,459 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:27:19,459 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-23 21:27:19,459 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-23 21:27:19,460 INFO L87 Difference]: Start difference. First operand 1887 states and 3577 transitions. Second operand has 3 states, 3 states have (on average 14.666666666666666) internal successors, (44), 3 states have internal predecessors, (44), 3 states have call successors, (9), 1 states have call predecessors, (9), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2023-11-23 21:27:19,966 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:27:19,967 INFO L93 Difference]: Finished difference Result 2248 states and 4033 transitions. [2023-11-23 21:27:19,967 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-23 21:27:19,967 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 14.666666666666666) internal successors, (44), 3 states have internal predecessors, (44), 3 states have call successors, (9), 1 states have call predecessors, (9), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 78 [2023-11-23 21:27:19,968 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:27:19,982 INFO L225 Difference]: With dead ends: 2248 [2023-11-23 21:27:19,982 INFO L226 Difference]: Without dead ends: 2007 [2023-11-23 21:27:19,984 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 [2023-11-23 21:27:19,986 INFO L413 NwaCegarLoop]: 3159 mSDtfsCounter, 3324 mSDsluCounter, 62 mSDsCounter, 0 mSdLazyCounter, 248 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3324 SdHoareTripleChecker+Valid, 3221 SdHoareTripleChecker+Invalid, 250 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 248 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-11-23 21:27:19,986 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3324 Valid, 3221 Invalid, 250 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 248 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-11-23 21:27:19,991 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2007 states. [2023-11-23 21:27:20,065 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2007 to 2002. [2023-11-23 21:27:20,071 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2002 states, 1892 states have (on average 1.890063424947146) internal successors, (3576), 1897 states have internal predecessors, (3576), 69 states have call successors, (69), 39 states have call predecessors, (69), 39 states have return successors, (69), 66 states have call predecessors, (69), 69 states have call successors, (69) [2023-11-23 21:27:20,086 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2002 states to 2002 states and 3714 transitions. [2023-11-23 21:27:20,086 INFO L78 Accepts]: Start accepts. Automaton has 2002 states and 3714 transitions. Word has length 78 [2023-11-23 21:27:20,087 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:27:20,087 INFO L495 AbstractCegarLoop]: Abstraction has 2002 states and 3714 transitions. [2023-11-23 21:27:20,087 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 14.666666666666666) internal successors, (44), 3 states have internal predecessors, (44), 3 states have call successors, (9), 1 states have call predecessors, (9), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2023-11-23 21:27:20,088 INFO L276 IsEmpty]: Start isEmpty. Operand 2002 states and 3714 transitions. [2023-11-23 21:27:20,090 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2023-11-23 21:27:20,091 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:27:20,091 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:27:20,091 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2023-11-23 21:27:20,092 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:27:20,092 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:27:20,092 INFO L85 PathProgramCache]: Analyzing trace with hash 1717459186, now seen corresponding path program 1 times [2023-11-23 21:27:20,093 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:27:20,093 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1040143605] [2023-11-23 21:27:20,093 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:27:20,093 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:27:20,123 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:27:20,235 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 21 proven. 1 refuted. 0 times theorem prover too weak. 31 trivial. 0 not checked. [2023-11-23 21:27:20,235 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:27:20,235 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1040143605] [2023-11-23 21:27:20,235 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1040143605] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:27:20,236 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [872850199] [2023-11-23 21:27:20,236 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:27:20,236 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:27:20,236 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a61b6e24-04f0-4e3f-84a4-4bfa55a3d796/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:27:20,238 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a61b6e24-04f0-4e3f-84a4-4bfa55a3d796/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:27:20,264 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a61b6e24-04f0-4e3f-84a4-4bfa55a3d796/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-23 21:27:20,369 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:27:20,372 INFO L262 TraceCheckSpWp]: Trace formula consists of 367 conjuncts, 2 conjunts are in the unsatisfiable core [2023-11-23 21:27:20,382 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:27:20,427 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 45 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-11-23 21:27:20,428 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-23 21:27:20,431 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [872850199] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:27:20,432 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-23 21:27:20,432 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [5] total 6 [2023-11-23 21:27:20,433 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [85910453] [2023-11-23 21:27:20,433 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:27:20,434 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-23 21:27:20,434 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:27:20,434 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-23 21:27:20,435 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2023-11-23 21:27:20,436 INFO L87 Difference]: Start difference. First operand 2002 states and 3714 transitions. Second operand has 3 states, 3 states have (on average 20.333333333333332) internal successors, (61), 3 states have internal predecessors, (61), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2023-11-23 21:27:21,016 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:27:21,016 INFO L93 Difference]: Finished difference Result 2317 states and 4109 transitions. [2023-11-23 21:27:21,017 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-23 21:27:21,017 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 20.333333333333332) internal successors, (61), 3 states have internal predecessors, (61), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) Word has length 90 [2023-11-23 21:27:21,018 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:27:21,036 INFO L225 Difference]: With dead ends: 2317 [2023-11-23 21:27:21,037 INFO L226 Difference]: Without dead ends: 2077 [2023-11-23 21:27:21,039 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 90 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2023-11-23 21:27:21,042 INFO L413 NwaCegarLoop]: 3156 mSDtfsCounter, 36 mSDsluCounter, 3128 mSDsCounter, 0 mSdLazyCounter, 463 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 36 SdHoareTripleChecker+Valid, 6284 SdHoareTripleChecker+Invalid, 463 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 463 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-11-23 21:27:21,043 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [36 Valid, 6284 Invalid, 463 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 463 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-11-23 21:27:21,050 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2077 states. [2023-11-23 21:27:21,172 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2077 to 2030. [2023-11-23 21:27:21,178 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2030 states, 1914 states have (on average 1.8834900731452455) internal successors, (3605), 1919 states have internal predecessors, (3605), 72 states have call successors, (72), 42 states have call predecessors, (72), 42 states have return successors, (72), 69 states have call predecessors, (72), 72 states have call successors, (72) [2023-11-23 21:27:21,199 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2030 states to 2030 states and 3749 transitions. [2023-11-23 21:27:21,199 INFO L78 Accepts]: Start accepts. Automaton has 2030 states and 3749 transitions. Word has length 90 [2023-11-23 21:27:21,204 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:27:21,205 INFO L495 AbstractCegarLoop]: Abstraction has 2030 states and 3749 transitions. [2023-11-23 21:27:21,205 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 20.333333333333332) internal successors, (61), 3 states have internal predecessors, (61), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2023-11-23 21:27:21,205 INFO L276 IsEmpty]: Start isEmpty. Operand 2030 states and 3749 transitions. [2023-11-23 21:27:21,209 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2023-11-23 21:27:21,210 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:27:21,213 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:27:21,242 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a61b6e24-04f0-4e3f-84a4-4bfa55a3d796/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-11-23 21:27:21,428 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a61b6e24-04f0-4e3f-84a4-4bfa55a3d796/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:27:21,429 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:27:21,429 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:27:21,429 INFO L85 PathProgramCache]: Analyzing trace with hash 1115955378, now seen corresponding path program 2 times [2023-11-23 21:27:21,429 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:27:21,430 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2020229496] [2023-11-23 21:27:21,430 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:27:21,430 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:27:21,453 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:27:21,726 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 10 proven. 15 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2023-11-23 21:27:21,726 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:27:21,727 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2020229496] [2023-11-23 21:27:21,727 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2020229496] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:27:21,727 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [9532661] [2023-11-23 21:27:21,727 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-23 21:27:21,728 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:27:21,728 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a61b6e24-04f0-4e3f-84a4-4bfa55a3d796/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:27:21,729 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a61b6e24-04f0-4e3f-84a4-4bfa55a3d796/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:27:21,756 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a61b6e24-04f0-4e3f-84a4-4bfa55a3d796/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-23 21:27:21,843 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2023-11-23 21:27:21,843 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-23 21:27:21,845 INFO L262 TraceCheckSpWp]: Trace formula consists of 245 conjuncts, 3 conjunts are in the unsatisfiable core [2023-11-23 21:27:21,852 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:27:21,891 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 35 proven. 0 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2023-11-23 21:27:21,892 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-23 21:27:21,892 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [9532661] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:27:21,892 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-23 21:27:21,892 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2023-11-23 21:27:21,893 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1844598415] [2023-11-23 21:27:21,893 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:27:21,894 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-23 21:27:21,894 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:27:21,895 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-23 21:27:21,896 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-11-23 21:27:21,897 INFO L87 Difference]: Start difference. First operand 2030 states and 3749 transitions. Second operand has 3 states, 3 states have (on average 18.333333333333332) internal successors, (55), 3 states have internal predecessors, (55), 3 states have call successors, (10), 3 states have call predecessors, (10), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) [2023-11-23 21:27:22,466 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:27:22,467 INFO L93 Difference]: Finished difference Result 2302 states and 4104 transitions. [2023-11-23 21:27:22,467 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-23 21:27:22,468 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 18.333333333333332) internal successors, (55), 3 states have internal predecessors, (55), 3 states have call successors, (10), 3 states have call predecessors, (10), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) Word has length 90 [2023-11-23 21:27:22,468 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:27:22,482 INFO L225 Difference]: With dead ends: 2302 [2023-11-23 21:27:22,482 INFO L226 Difference]: Without dead ends: 2034 [2023-11-23 21:27:22,484 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 92 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-11-23 21:27:22,489 INFO L413 NwaCegarLoop]: 3152 mSDtfsCounter, 68 mSDsluCounter, 3119 mSDsCounter, 0 mSdLazyCounter, 464 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 68 SdHoareTripleChecker+Valid, 6271 SdHoareTripleChecker+Invalid, 467 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 464 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-11-23 21:27:22,489 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [68 Valid, 6271 Invalid, 467 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 464 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-11-23 21:27:22,494 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2034 states. [2023-11-23 21:27:22,577 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2034 to 2028. [2023-11-23 21:27:22,582 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2028 states, 1912 states have (on average 1.87918410041841) internal successors, (3593), 1917 states have internal predecessors, (3593), 72 states have call successors, (72), 42 states have call predecessors, (72), 42 states have return successors, (72), 69 states have call predecessors, (72), 72 states have call successors, (72) [2023-11-23 21:27:22,598 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2028 states to 2028 states and 3737 transitions. [2023-11-23 21:27:22,598 INFO L78 Accepts]: Start accepts. Automaton has 2028 states and 3737 transitions. Word has length 90 [2023-11-23 21:27:22,599 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:27:22,599 INFO L495 AbstractCegarLoop]: Abstraction has 2028 states and 3737 transitions. [2023-11-23 21:27:22,599 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 18.333333333333332) internal successors, (55), 3 states have internal predecessors, (55), 3 states have call successors, (10), 3 states have call predecessors, (10), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) [2023-11-23 21:27:22,599 INFO L276 IsEmpty]: Start isEmpty. Operand 2028 states and 3737 transitions. [2023-11-23 21:27:22,606 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2023-11-23 21:27:22,607 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:27:22,607 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:27:22,628 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a61b6e24-04f0-4e3f-84a4-4bfa55a3d796/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-11-23 21:27:22,827 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a61b6e24-04f0-4e3f-84a4-4bfa55a3d796/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2023-11-23 21:27:22,828 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:27:22,828 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:27:22,828 INFO L85 PathProgramCache]: Analyzing trace with hash 1689453138, now seen corresponding path program 1 times [2023-11-23 21:27:22,829 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:27:22,829 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [305536265] [2023-11-23 21:27:22,829 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:27:22,829 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:27:22,850 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:27:23,082 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 10 proven. 13 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2023-11-23 21:27:23,083 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:27:23,083 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [305536265] [2023-11-23 21:27:23,083 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [305536265] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:27:23,084 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [818181119] [2023-11-23 21:27:23,084 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:27:23,085 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:27:23,085 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a61b6e24-04f0-4e3f-84a4-4bfa55a3d796/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:27:23,086 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a61b6e24-04f0-4e3f-84a4-4bfa55a3d796/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:27:23,120 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a61b6e24-04f0-4e3f-84a4-4bfa55a3d796/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-23 21:27:23,277 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:27:23,279 INFO L262 TraceCheckSpWp]: Trace formula consists of 373 conjuncts, 2 conjunts are in the unsatisfiable core [2023-11-23 21:27:23,294 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:27:23,446 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 37 proven. 0 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2023-11-23 21:27:23,446 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-23 21:27:23,446 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [818181119] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:27:23,447 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-23 21:27:23,447 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2023-11-23 21:27:23,447 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1880519128] [2023-11-23 21:27:23,447 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:27:23,448 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-23 21:27:23,448 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:27:23,449 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-23 21:27:23,449 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-11-23 21:27:23,449 INFO L87 Difference]: Start difference. First operand 2028 states and 3737 transitions. Second operand has 3 states, 3 states have (on average 19.666666666666668) internal successors, (59), 3 states have internal predecessors, (59), 3 states have call successors, (10), 3 states have call predecessors, (10), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) [2023-11-23 21:27:23,852 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:27:23,852 INFO L93 Difference]: Finished difference Result 2345 states and 4122 transitions. [2023-11-23 21:27:23,852 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-23 21:27:23,853 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 19.666666666666668) internal successors, (59), 3 states have internal predecessors, (59), 3 states have call successors, (10), 3 states have call predecessors, (10), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) Word has length 90 [2023-11-23 21:27:23,853 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:27:23,866 INFO L225 Difference]: With dead ends: 2345 [2023-11-23 21:27:23,867 INFO L226 Difference]: Without dead ends: 2089 [2023-11-23 21:27:23,868 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 92 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-11-23 21:27:23,869 INFO L413 NwaCegarLoop]: 3133 mSDtfsCounter, 3334 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 233 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3334 SdHoareTripleChecker+Valid, 3147 SdHoareTripleChecker+Invalid, 237 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 233 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-11-23 21:27:23,870 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3334 Valid, 3147 Invalid, 237 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 233 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-11-23 21:27:23,874 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2089 states. [2023-11-23 21:27:23,939 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2089 to 2089. [2023-11-23 21:27:23,945 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2089 states, 1963 states have (on average 1.857870606214977) internal successors, (3647), 1968 states have internal predecessors, (3647), 74 states have call successors, (74), 50 states have call predecessors, (74), 50 states have return successors, (74), 71 states have call predecessors, (74), 74 states have call successors, (74) [2023-11-23 21:27:23,964 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2089 states to 2089 states and 3795 transitions. [2023-11-23 21:27:23,964 INFO L78 Accepts]: Start accepts. Automaton has 2089 states and 3795 transitions. Word has length 90 [2023-11-23 21:27:23,964 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:27:23,965 INFO L495 AbstractCegarLoop]: Abstraction has 2089 states and 3795 transitions. [2023-11-23 21:27:23,965 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 19.666666666666668) internal successors, (59), 3 states have internal predecessors, (59), 3 states have call successors, (10), 3 states have call predecessors, (10), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) [2023-11-23 21:27:23,965 INFO L276 IsEmpty]: Start isEmpty. Operand 2089 states and 3795 transitions. [2023-11-23 21:27:23,969 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2023-11-23 21:27:23,969 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:27:23,969 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:27:23,995 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a61b6e24-04f0-4e3f-84a4-4bfa55a3d796/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-11-23 21:27:24,184 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a61b6e24-04f0-4e3f-84a4-4bfa55a3d796/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2023-11-23 21:27:24,185 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:27:24,185 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:27:24,185 INFO L85 PathProgramCache]: Analyzing trace with hash 975032071, now seen corresponding path program 1 times [2023-11-23 21:27:24,185 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:27:24,185 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [874054514] [2023-11-23 21:27:24,185 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:27:24,186 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:27:24,211 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:27:24,427 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 10 proven. 14 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2023-11-23 21:27:24,429 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:27:24,430 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [874054514] [2023-11-23 21:27:24,430 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [874054514] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:27:24,430 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [712141875] [2023-11-23 21:27:24,430 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:27:24,430 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:27:24,431 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a61b6e24-04f0-4e3f-84a4-4bfa55a3d796/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:27:24,432 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a61b6e24-04f0-4e3f-84a4-4bfa55a3d796/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:27:24,456 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a61b6e24-04f0-4e3f-84a4-4bfa55a3d796/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-11-23 21:27:24,552 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:27:24,555 INFO L262 TraceCheckSpWp]: Trace formula consists of 372 conjuncts, 3 conjunts are in the unsatisfiable core [2023-11-23 21:27:24,557 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:27:24,599 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 40 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-11-23 21:27:24,600 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-23 21:27:24,600 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [712141875] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:27:24,600 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-23 21:27:24,600 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2023-11-23 21:27:24,601 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1662776105] [2023-11-23 21:27:24,601 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:27:24,601 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-23 21:27:24,602 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:27:24,602 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-23 21:27:24,602 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-11-23 21:27:24,603 INFO L87 Difference]: Start difference. First operand 2089 states and 3795 transitions. Second operand has 3 states, 3 states have (on average 21.0) internal successors, (63), 3 states have internal predecessors, (63), 3 states have call successors, (10), 3 states have call predecessors, (10), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2023-11-23 21:27:25,123 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:27:25,123 INFO L93 Difference]: Finished difference Result 2698 states and 4514 transitions. [2023-11-23 21:27:25,124 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-23 21:27:25,124 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 21.0) internal successors, (63), 3 states have internal predecessors, (63), 3 states have call successors, (10), 3 states have call predecessors, (10), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) Word has length 91 [2023-11-23 21:27:25,125 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:27:25,138 INFO L225 Difference]: With dead ends: 2698 [2023-11-23 21:27:25,138 INFO L226 Difference]: Without dead ends: 2256 [2023-11-23 21:27:25,141 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 93 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-11-23 21:27:25,143 INFO L413 NwaCegarLoop]: 3142 mSDtfsCounter, 32 mSDsluCounter, 3117 mSDsCounter, 0 mSdLazyCounter, 459 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 32 SdHoareTripleChecker+Valid, 6259 SdHoareTripleChecker+Invalid, 461 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 459 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-11-23 21:27:25,143 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [32 Valid, 6259 Invalid, 461 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 459 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-11-23 21:27:25,148 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2256 states. [2023-11-23 21:27:25,226 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2256 to 2136. [2023-11-23 21:27:25,232 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2136 states, 1998 states have (on average 1.8463463463463463) internal successors, (3689), 2004 states have internal predecessors, (3689), 80 states have call successors, (80), 56 states have call predecessors, (80), 56 states have return successors, (80), 76 states have call predecessors, (80), 80 states have call successors, (80) [2023-11-23 21:27:25,240 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2136 states to 2136 states and 3849 transitions. [2023-11-23 21:27:25,241 INFO L78 Accepts]: Start accepts. Automaton has 2136 states and 3849 transitions. Word has length 91 [2023-11-23 21:27:25,242 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:27:25,243 INFO L495 AbstractCegarLoop]: Abstraction has 2136 states and 3849 transitions. [2023-11-23 21:27:25,243 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 21.0) internal successors, (63), 3 states have internal predecessors, (63), 3 states have call successors, (10), 3 states have call predecessors, (10), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2023-11-23 21:27:25,243 INFO L276 IsEmpty]: Start isEmpty. Operand 2136 states and 3849 transitions. [2023-11-23 21:27:25,245 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2023-11-23 21:27:25,245 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:27:25,246 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:27:25,266 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a61b6e24-04f0-4e3f-84a4-4bfa55a3d796/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-11-23 21:27:25,460 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a61b6e24-04f0-4e3f-84a4-4bfa55a3d796/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:27:25,460 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:27:25,461 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:27:25,461 INFO L85 PathProgramCache]: Analyzing trace with hash -2010999944, now seen corresponding path program 1 times [2023-11-23 21:27:25,461 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:27:25,461 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1506765446] [2023-11-23 21:27:25,461 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:27:25,461 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:27:25,483 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:27:25,593 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 19 proven. 0 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2023-11-23 21:27:25,593 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:27:25,593 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1506765446] [2023-11-23 21:27:25,593 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1506765446] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:27:25,594 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 21:27:25,594 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-11-23 21:27:25,594 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1521449445] [2023-11-23 21:27:25,594 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:27:25,595 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-23 21:27:25,595 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:27:25,595 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-23 21:27:25,595 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-23 21:27:25,596 INFO L87 Difference]: Start difference. First operand 2136 states and 3849 transitions. Second operand has 4 states, 4 states have (on average 13.5) internal successors, (54), 4 states have internal predecessors, (54), 3 states have call successors, (9), 1 states have call predecessors, (9), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2023-11-23 21:27:26,304 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:27:26,304 INFO L93 Difference]: Finished difference Result 2906 states and 4768 transitions. [2023-11-23 21:27:26,305 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-23 21:27:26,305 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 13.5) internal successors, (54), 4 states have internal predecessors, (54), 3 states have call successors, (9), 1 states have call predecessors, (9), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 93 [2023-11-23 21:27:26,306 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:27:26,324 INFO L225 Difference]: With dead ends: 2906 [2023-11-23 21:27:26,324 INFO L226 Difference]: Without dead ends: 2654 [2023-11-23 21:27:26,326 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 [2023-11-23 21:27:26,327 INFO L413 NwaCegarLoop]: 3180 mSDtfsCounter, 3397 mSDsluCounter, 3136 mSDsCounter, 0 mSdLazyCounter, 532 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3397 SdHoareTripleChecker+Valid, 6316 SdHoareTripleChecker+Invalid, 535 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 532 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-11-23 21:27:26,328 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3397 Valid, 6316 Invalid, 535 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 532 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-11-23 21:27:26,333 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2654 states. [2023-11-23 21:27:26,465 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2654 to 2452. [2023-11-23 21:27:26,473 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2452 states, 2228 states have (on average 1.7809694793536803) internal successors, (3968), 2233 states have internal predecessors, (3968), 131 states have call successors, (131), 91 states have call predecessors, (131), 91 states have return successors, (131), 128 states have call predecessors, (131), 131 states have call successors, (131) [2023-11-23 21:27:26,482 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2452 states to 2452 states and 4230 transitions. [2023-11-23 21:27:26,482 INFO L78 Accepts]: Start accepts. Automaton has 2452 states and 4230 transitions. Word has length 93 [2023-11-23 21:27:26,483 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:27:26,483 INFO L495 AbstractCegarLoop]: Abstraction has 2452 states and 4230 transitions. [2023-11-23 21:27:26,483 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 13.5) internal successors, (54), 4 states have internal predecessors, (54), 3 states have call successors, (9), 1 states have call predecessors, (9), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2023-11-23 21:27:26,484 INFO L276 IsEmpty]: Start isEmpty. Operand 2452 states and 4230 transitions. [2023-11-23 21:27:26,487 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 101 [2023-11-23 21:27:26,487 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:27:26,487 INFO L195 NwaCegarLoop]: trace histogram [5, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:27:26,487 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2023-11-23 21:27:26,488 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:27:26,488 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:27:26,489 INFO L85 PathProgramCache]: Analyzing trace with hash 1122035630, now seen corresponding path program 1 times [2023-11-23 21:27:26,489 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:27:26,489 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1098390511] [2023-11-23 21:27:26,489 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:27:26,489 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:27:26,513 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:27:26,719 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 17 proven. 14 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2023-11-23 21:27:26,719 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:27:26,719 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1098390511] [2023-11-23 21:27:26,719 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1098390511] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:27:26,719 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2002734658] [2023-11-23 21:27:26,720 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:27:26,720 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:27:26,720 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a61b6e24-04f0-4e3f-84a4-4bfa55a3d796/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:27:26,721 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a61b6e24-04f0-4e3f-84a4-4bfa55a3d796/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:27:26,744 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a61b6e24-04f0-4e3f-84a4-4bfa55a3d796/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-11-23 21:27:26,850 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:27:26,852 INFO L262 TraceCheckSpWp]: Trace formula consists of 414 conjuncts, 8 conjunts are in the unsatisfiable core [2023-11-23 21:27:26,855 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:27:26,998 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 50 proven. 0 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2023-11-23 21:27:26,998 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-23 21:27:26,999 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2002734658] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:27:26,999 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-23 21:27:26,999 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [8] total 13 [2023-11-23 21:27:26,999 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1764031837] [2023-11-23 21:27:27,000 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:27:27,000 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-11-23 21:27:27,000 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:27:27,001 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-11-23 21:27:27,001 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=125, Unknown=0, NotChecked=0, Total=156 [2023-11-23 21:27:27,001 INFO L87 Difference]: Start difference. First operand 2452 states and 4230 transitions. Second operand has 7 states, 6 states have (on average 10.166666666666666) internal successors, (61), 6 states have internal predecessors, (61), 3 states have call successors, (15), 3 states have call predecessors, (15), 3 states have return successors, (15), 3 states have call predecessors, (15), 3 states have call successors, (15) [2023-11-23 21:27:28,107 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:27:28,107 INFO L93 Difference]: Finished difference Result 2960 states and 4838 transitions. [2023-11-23 21:27:28,108 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2023-11-23 21:27:28,108 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 10.166666666666666) internal successors, (61), 6 states have internal predecessors, (61), 3 states have call successors, (15), 3 states have call predecessors, (15), 3 states have return successors, (15), 3 states have call predecessors, (15), 3 states have call successors, (15) Word has length 100 [2023-11-23 21:27:28,108 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:27:28,124 INFO L225 Difference]: With dead ends: 2960 [2023-11-23 21:27:28,124 INFO L226 Difference]: Without dead ends: 2464 [2023-11-23 21:27:28,127 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 114 GetRequests, 99 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=63, Invalid=209, Unknown=0, NotChecked=0, Total=272 [2023-11-23 21:27:28,127 INFO L413 NwaCegarLoop]: 3163 mSDtfsCounter, 51 mSDsluCounter, 12590 mSDsCounter, 0 mSdLazyCounter, 1220 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 53 SdHoareTripleChecker+Valid, 15753 SdHoareTripleChecker+Invalid, 1223 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 1220 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2023-11-23 21:27:28,128 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [53 Valid, 15753 Invalid, 1223 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [3 Valid, 1220 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2023-11-23 21:27:28,133 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2464 states. [2023-11-23 21:27:28,233 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2464 to 2414. [2023-11-23 21:27:28,239 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2414 states, 2201 states have (on average 1.7873693775556565) internal successors, (3934), 2206 states have internal predecessors, (3934), 124 states have call successors, (124), 87 states have call predecessors, (124), 87 states have return successors, (124), 121 states have call predecessors, (124), 124 states have call successors, (124) [2023-11-23 21:27:28,245 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2414 states to 2414 states and 4182 transitions. [2023-11-23 21:27:28,246 INFO L78 Accepts]: Start accepts. Automaton has 2414 states and 4182 transitions. Word has length 100 [2023-11-23 21:27:28,246 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:27:28,246 INFO L495 AbstractCegarLoop]: Abstraction has 2414 states and 4182 transitions. [2023-11-23 21:27:28,247 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 10.166666666666666) internal successors, (61), 6 states have internal predecessors, (61), 3 states have call successors, (15), 3 states have call predecessors, (15), 3 states have return successors, (15), 3 states have call predecessors, (15), 3 states have call successors, (15) [2023-11-23 21:27:28,247 INFO L276 IsEmpty]: Start isEmpty. Operand 2414 states and 4182 transitions. [2023-11-23 21:27:28,249 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2023-11-23 21:27:28,249 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:27:28,249 INFO L195 NwaCegarLoop]: trace histogram [5, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:27:28,275 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a61b6e24-04f0-4e3f-84a4-4bfa55a3d796/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-11-23 21:27:28,470 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a61b6e24-04f0-4e3f-84a4-4bfa55a3d796/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2023-11-23 21:27:28,471 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:27:28,471 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:27:28,471 INFO L85 PathProgramCache]: Analyzing trace with hash 1753264576, now seen corresponding path program 1 times [2023-11-23 21:27:28,471 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:27:28,472 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1489203024] [2023-11-23 21:27:28,472 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:27:28,472 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:27:28,495 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:27:29,342 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 19 proven. 21 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2023-11-23 21:27:29,342 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:27:29,342 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1489203024] [2023-11-23 21:27:29,343 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1489203024] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:27:29,343 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1298194365] [2023-11-23 21:27:29,343 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:27:29,343 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:27:29,343 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a61b6e24-04f0-4e3f-84a4-4bfa55a3d796/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:27:29,344 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a61b6e24-04f0-4e3f-84a4-4bfa55a3d796/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:27:29,364 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a61b6e24-04f0-4e3f-84a4-4bfa55a3d796/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-11-23 21:27:29,467 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:27:29,470 INFO L262 TraceCheckSpWp]: Trace formula consists of 423 conjuncts, 27 conjunts are in the unsatisfiable core [2023-11-23 21:27:29,475 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:27:29,777 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 50 proven. 0 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2023-11-23 21:27:29,777 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-23 21:27:29,778 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1298194365] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:27:29,778 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-23 21:27:29,778 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [18] total 22 [2023-11-23 21:27:29,780 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1286934830] [2023-11-23 21:27:29,781 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:27:29,781 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2023-11-23 21:27:29,781 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:27:29,782 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2023-11-23 21:27:29,782 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=399, Unknown=0, NotChecked=0, Total=462 [2023-11-23 21:27:29,783 INFO L87 Difference]: Start difference. First operand 2414 states and 4182 transitions. Second operand has 9 states, 6 states have (on average 10.666666666666666) internal successors, (64), 6 states have internal predecessors, (64), 3 states have call successors, (15), 5 states have call predecessors, (15), 6 states have return successors, (15), 3 states have call predecessors, (15), 3 states have call successors, (15) [2023-11-23 21:27:31,475 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:27:31,475 INFO L93 Difference]: Finished difference Result 2973 states and 4849 transitions. [2023-11-23 21:27:31,476 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2023-11-23 21:27:31,476 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 6 states have (on average 10.666666666666666) internal successors, (64), 6 states have internal predecessors, (64), 3 states have call successors, (15), 5 states have call predecessors, (15), 6 states have return successors, (15), 3 states have call predecessors, (15), 3 states have call successors, (15) Word has length 103 [2023-11-23 21:27:31,476 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:27:31,494 INFO L225 Difference]: With dead ends: 2973 [2023-11-23 21:27:31,494 INFO L226 Difference]: Without dead ends: 2536 [2023-11-23 21:27:31,497 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 130 GetRequests, 103 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 145 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=149, Invalid=663, Unknown=0, NotChecked=0, Total=812 [2023-11-23 21:27:31,498 INFO L413 NwaCegarLoop]: 3104 mSDtfsCounter, 6750 mSDsluCounter, 12375 mSDsCounter, 0 mSdLazyCounter, 1348 mSolverCounterSat, 125 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6764 SdHoareTripleChecker+Valid, 15479 SdHoareTripleChecker+Invalid, 1473 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 125 IncrementalHoareTripleChecker+Valid, 1348 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.3s IncrementalHoareTripleChecker+Time [2023-11-23 21:27:31,499 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [6764 Valid, 15479 Invalid, 1473 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [125 Valid, 1348 Invalid, 0 Unknown, 0 Unchecked, 1.3s Time] [2023-11-23 21:27:31,505 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2536 states. [2023-11-23 21:27:31,624 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2536 to 2374. [2023-11-23 21:27:31,629 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2374 states, 2177 states have (on average 1.788240698208544) internal successors, (3893), 2182 states have internal predecessors, (3893), 113 states have call successors, (113), 82 states have call predecessors, (113), 82 states have return successors, (113), 110 states have call predecessors, (113), 113 states have call successors, (113) [2023-11-23 21:27:31,636 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2374 states to 2374 states and 4119 transitions. [2023-11-23 21:27:31,636 INFO L78 Accepts]: Start accepts. Automaton has 2374 states and 4119 transitions. Word has length 103 [2023-11-23 21:27:31,637 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:27:31,637 INFO L495 AbstractCegarLoop]: Abstraction has 2374 states and 4119 transitions. [2023-11-23 21:27:31,638 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 6 states have (on average 10.666666666666666) internal successors, (64), 6 states have internal predecessors, (64), 3 states have call successors, (15), 5 states have call predecessors, (15), 6 states have return successors, (15), 3 states have call predecessors, (15), 3 states have call successors, (15) [2023-11-23 21:27:31,639 INFO L276 IsEmpty]: Start isEmpty. Operand 2374 states and 4119 transitions. [2023-11-23 21:27:31,641 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2023-11-23 21:27:31,642 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:27:31,642 INFO L195 NwaCegarLoop]: trace histogram [5, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:27:31,677 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a61b6e24-04f0-4e3f-84a4-4bfa55a3d796/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2023-11-23 21:27:31,852 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a61b6e24-04f0-4e3f-84a4-4bfa55a3d796/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2023-11-23 21:27:31,853 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:27:31,853 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:27:31,854 INFO L85 PathProgramCache]: Analyzing trace with hash -1360093710, now seen corresponding path program 1 times [2023-11-23 21:27:31,854 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:27:31,854 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1344616041] [2023-11-23 21:27:31,854 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:27:31,854 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:27:31,887 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:27:32,611 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 28 proven. 17 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2023-11-23 21:27:32,611 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:27:32,612 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1344616041] [2023-11-23 21:27:32,612 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1344616041] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:27:32,612 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [904281806] [2023-11-23 21:27:32,612 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:27:32,613 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:27:32,613 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a61b6e24-04f0-4e3f-84a4-4bfa55a3d796/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:27:32,614 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a61b6e24-04f0-4e3f-84a4-4bfa55a3d796/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:27:32,632 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a61b6e24-04f0-4e3f-84a4-4bfa55a3d796/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-11-23 21:27:32,756 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:27:32,758 INFO L262 TraceCheckSpWp]: Trace formula consists of 422 conjuncts, 18 conjunts are in the unsatisfiable core [2023-11-23 21:27:32,762 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:27:32,917 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 40 proven. 2 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2023-11-23 21:27:32,918 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 21:27:33,139 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 28 proven. 0 refuted. 0 times theorem prover too weak. 38 trivial. 0 not checked. [2023-11-23 21:27:33,140 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [904281806] provided 1 perfect and 1 imperfect interpolant sequences [2023-11-23 21:27:33,140 INFO L185 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2023-11-23 21:27:33,140 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [16, 6] total 22 [2023-11-23 21:27:33,141 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [176536814] [2023-11-23 21:27:33,141 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:27:33,141 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-23 21:27:33,142 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:27:33,142 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-23 21:27:33,143 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=395, Unknown=0, NotChecked=0, Total=462 [2023-11-23 21:27:33,143 INFO L87 Difference]: Start difference. First operand 2374 states and 4119 transitions. Second operand has 5 states, 5 states have (on average 11.6) internal successors, (58), 5 states have internal predecessors, (58), 2 states have call successors, (14), 2 states have call predecessors, (14), 2 states have return successors, (14), 2 states have call predecessors, (14), 2 states have call successors, (14) [2023-11-23 21:27:34,233 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:27:34,233 INFO L93 Difference]: Finished difference Result 3393 states and 5308 transitions. [2023-11-23 21:27:34,234 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-23 21:27:34,234 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 11.6) internal successors, (58), 5 states have internal predecessors, (58), 2 states have call successors, (14), 2 states have call predecessors, (14), 2 states have return successors, (14), 2 states have call predecessors, (14), 2 states have call successors, (14) Word has length 104 [2023-11-23 21:27:34,234 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:27:34,246 INFO L225 Difference]: With dead ends: 3393 [2023-11-23 21:27:34,247 INFO L226 Difference]: Without dead ends: 2500 [2023-11-23 21:27:34,250 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 227 GetRequests, 206 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 81 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=73, Invalid=433, Unknown=0, NotChecked=0, Total=506 [2023-11-23 21:27:34,251 INFO L413 NwaCegarLoop]: 3140 mSDtfsCounter, 47 mSDsluCounter, 9284 mSDsCounter, 0 mSdLazyCounter, 993 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 47 SdHoareTripleChecker+Valid, 12424 SdHoareTripleChecker+Invalid, 1012 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 993 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2023-11-23 21:27:34,251 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [47 Valid, 12424 Invalid, 1012 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 993 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2023-11-23 21:27:34,256 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2500 states. [2023-11-23 21:27:34,383 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2500 to 2442. [2023-11-23 21:27:34,388 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2442 states, 2202 states have (on average 1.7724795640326976) internal successors, (3903), 2213 states have internal predecessors, (3903), 141 states have call successors, (141), 93 states have call predecessors, (141), 97 states have return successors, (147), 136 states have call predecessors, (147), 141 states have call successors, (147) [2023-11-23 21:27:34,394 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2442 states to 2442 states and 4191 transitions. [2023-11-23 21:27:34,395 INFO L78 Accepts]: Start accepts. Automaton has 2442 states and 4191 transitions. Word has length 104 [2023-11-23 21:27:34,396 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:27:34,396 INFO L495 AbstractCegarLoop]: Abstraction has 2442 states and 4191 transitions. [2023-11-23 21:27:34,396 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 11.6) internal successors, (58), 5 states have internal predecessors, (58), 2 states have call successors, (14), 2 states have call predecessors, (14), 2 states have return successors, (14), 2 states have call predecessors, (14), 2 states have call successors, (14) [2023-11-23 21:27:34,396 INFO L276 IsEmpty]: Start isEmpty. Operand 2442 states and 4191 transitions. [2023-11-23 21:27:34,400 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 161 [2023-11-23 21:27:34,400 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:27:34,401 INFO L195 NwaCegarLoop]: trace histogram [7, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:27:34,428 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a61b6e24-04f0-4e3f-84a4-4bfa55a3d796/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2023-11-23 21:27:34,616 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a61b6e24-04f0-4e3f-84a4-4bfa55a3d796/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:27:34,617 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:27:34,617 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:27:34,617 INFO L85 PathProgramCache]: Analyzing trace with hash 1170306624, now seen corresponding path program 1 times [2023-11-23 21:27:34,617 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:27:34,617 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1180519136] [2023-11-23 21:27:34,618 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:27:34,618 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:27:34,640 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat