./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/combinations/Problem05_label49+token_ring.03.cil-1.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 30e01a73 Calling Ultimate with: /usr/lib/jvm/java-11-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81be26ac-cc45-4fcc-b375-69635166c334/bin/utaipan-verify-mE87zJ7Ire/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81be26ac-cc45-4fcc-b375-69635166c334/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_81be26ac-cc45-4fcc-b375-69635166c334/bin/utaipan-verify-mE87zJ7Ire/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81be26ac-cc45-4fcc-b375-69635166c334/bin/utaipan-verify-mE87zJ7Ire/config/TaipanReach.xml -i ../../sv-benchmarks/c/combinations/Problem05_label49+token_ring.03.cil-1.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81be26ac-cc45-4fcc-b375-69635166c334/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_81be26ac-cc45-4fcc-b375-69635166c334/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 45212159197fe0bc553796025c4b5584a047c150b6d840572b407bf4bd1f9446 --- Real Ultimate output --- This is Ultimate 0.2.3-dev-30e01a7 [2023-11-23 21:12:47,893 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-23 21:12:47,973 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81be26ac-cc45-4fcc-b375-69635166c334/bin/utaipan-verify-mE87zJ7Ire/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-11-23 21:12:47,980 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-23 21:12:47,981 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-23 21:12:48,012 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-23 21:12:48,013 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-23 21:12:48,014 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-23 21:12:48,015 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-23 21:12:48,016 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-23 21:12:48,017 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-23 21:12:48,018 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-23 21:12:48,018 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-23 21:12:48,019 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-23 21:12:48,020 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-23 21:12:48,021 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-23 21:12:48,022 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-23 21:12:48,022 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-23 21:12:48,023 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-23 21:12:48,024 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-23 21:12:48,024 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-23 21:12:48,025 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-23 21:12:48,026 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-23 21:12:48,027 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-11-23 21:12:48,028 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-23 21:12:48,028 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-23 21:12:48,029 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-23 21:12:48,029 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-23 21:12:48,030 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-11-23 21:12:48,031 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-23 21:12:48,031 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-11-23 21:12:48,032 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-23 21:12:48,032 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-11-23 21:12:48,033 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-23 21:12:48,033 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-23 21:12:48,033 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-11-23 21:12:48,034 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-23 21:12:48,034 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-23 21:12:48,035 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-23 21:12:48,035 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-23 21:12:48,036 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-11-23 21:12:48,036 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-23 21:12:48,037 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-23 21:12:48,037 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-11-23 21:12:48,037 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-11-23 21:12:48,038 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-23 21:12:48,038 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-23 21:12:48,039 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_81be26ac-cc45-4fcc-b375-69635166c334/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81be26ac-cc45-4fcc-b375-69635166c334/bin/utaipan-verify-mE87zJ7Ire Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 45212159197fe0bc553796025c4b5584a047c150b6d840572b407bf4bd1f9446 [2023-11-23 21:12:48,379 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-23 21:12:48,412 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-23 21:12:48,415 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-23 21:12:48,418 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-23 21:12:48,418 INFO L274 PluginConnector]: CDTParser initialized [2023-11-23 21:12:48,420 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81be26ac-cc45-4fcc-b375-69635166c334/bin/utaipan-verify-mE87zJ7Ire/../../sv-benchmarks/c/combinations/Problem05_label49+token_ring.03.cil-1.c [2023-11-23 21:12:51,578 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-23 21:12:52,380 INFO L384 CDTParser]: Found 1 translation units. [2023-11-23 21:12:52,381 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81be26ac-cc45-4fcc-b375-69635166c334/sv-benchmarks/c/combinations/Problem05_label49+token_ring.03.cil-1.c [2023-11-23 21:12:52,461 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81be26ac-cc45-4fcc-b375-69635166c334/bin/utaipan-verify-mE87zJ7Ire/data/1e2644a8d/f03b3d75b9d141b6baa0064baa0e2036/FLAGa5d117cd0 [2023-11-23 21:12:52,486 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81be26ac-cc45-4fcc-b375-69635166c334/bin/utaipan-verify-mE87zJ7Ire/data/1e2644a8d/f03b3d75b9d141b6baa0064baa0e2036 [2023-11-23 21:12:52,495 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-23 21:12:52,498 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-23 21:12:52,499 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-23 21:12:52,500 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-23 21:12:52,506 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-23 21:12:52,506 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 09:12:52" (1/1) ... [2023-11-23 21:12:52,508 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@662f4e1a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:12:52, skipping insertion in model container [2023-11-23 21:12:52,508 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 09:12:52" (1/1) ... [2023-11-23 21:12:52,796 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-23 21:12:55,416 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_81be26ac-cc45-4fcc-b375-69635166c334/sv-benchmarks/c/combinations/Problem05_label49+token_ring.03.cil-1.c[380593,380606] [2023-11-23 21:12:55,454 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_81be26ac-cc45-4fcc-b375-69635166c334/sv-benchmarks/c/combinations/Problem05_label49+token_ring.03.cil-1.c[383339,383352] [2023-11-23 21:12:55,732 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-23 21:12:55,749 INFO L202 MainTranslator]: Completed pre-run [2023-11-23 21:12:57,100 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_81be26ac-cc45-4fcc-b375-69635166c334/sv-benchmarks/c/combinations/Problem05_label49+token_ring.03.cil-1.c[380593,380606] [2023-11-23 21:12:57,106 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_81be26ac-cc45-4fcc-b375-69635166c334/sv-benchmarks/c/combinations/Problem05_label49+token_ring.03.cil-1.c[383339,383352] [2023-11-23 21:12:57,121 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-23 21:12:57,206 INFO L206 MainTranslator]: Completed translation [2023-11-23 21:12:57,206 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:12:57 WrapperNode [2023-11-23 21:12:57,207 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-23 21:12:57,208 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-23 21:12:57,208 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-23 21:12:57,208 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-23 21:12:57,217 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:12:57" (1/1) ... [2023-11-23 21:12:57,348 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:12:57" (1/1) ... [2023-11-23 21:12:57,920 INFO L138 Inliner]: procedures = 50, calls = 51, calls flagged for inlining = 27, calls inlined = 27, statements flattened = 12694 [2023-11-23 21:12:57,921 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-23 21:12:57,922 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-23 21:12:57,922 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-23 21:12:57,923 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-23 21:12:57,969 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:12:57" (1/1) ... [2023-11-23 21:12:57,969 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:12:57" (1/1) ... [2023-11-23 21:12:58,121 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:12:57" (1/1) ... [2023-11-23 21:12:58,136 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:12:57" (1/1) ... [2023-11-23 21:12:58,463 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:12:57" (1/1) ... [2023-11-23 21:12:58,514 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:12:57" (1/1) ... [2023-11-23 21:12:58,537 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:12:57" (1/1) ... [2023-11-23 21:12:58,561 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:12:57" (1/1) ... [2023-11-23 21:12:58,713 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-23 21:12:58,714 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-23 21:12:58,714 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-23 21:12:58,714 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-23 21:12:58,716 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:12:57" (1/1) ... [2023-11-23 21:12:58,724 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-23 21:12:58,744 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81be26ac-cc45-4fcc-b375-69635166c334/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:12:58,758 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81be26ac-cc45-4fcc-b375-69635166c334/bin/utaipan-verify-mE87zJ7Ire/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-23 21:12:58,776 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81be26ac-cc45-4fcc-b375-69635166c334/bin/utaipan-verify-mE87zJ7Ire/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-23 21:12:58,805 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-23 21:12:58,805 INFO L130 BoogieDeclarations]: Found specification of procedure activate_threads [2023-11-23 21:12:58,805 INFO L138 BoogieDeclarations]: Found implementation of procedure activate_threads [2023-11-23 21:12:58,805 INFO L130 BoogieDeclarations]: Found specification of procedure immediate_notify [2023-11-23 21:12:58,805 INFO L138 BoogieDeclarations]: Found implementation of procedure immediate_notify [2023-11-23 21:12:58,806 INFO L130 BoogieDeclarations]: Found specification of procedure update_channels [2023-11-23 21:12:58,806 INFO L138 BoogieDeclarations]: Found implementation of procedure update_channels [2023-11-23 21:12:58,808 INFO L130 BoogieDeclarations]: Found specification of procedure error [2023-11-23 21:12:58,808 INFO L138 BoogieDeclarations]: Found implementation of procedure error [2023-11-23 21:12:58,809 INFO L130 BoogieDeclarations]: Found specification of procedure fire_delta_events [2023-11-23 21:12:58,809 INFO L138 BoogieDeclarations]: Found implementation of procedure fire_delta_events [2023-11-23 21:12:58,809 INFO L130 BoogieDeclarations]: Found specification of procedure exists_runnable_thread [2023-11-23 21:12:58,809 INFO L138 BoogieDeclarations]: Found implementation of procedure exists_runnable_thread [2023-11-23 21:12:58,810 INFO L130 BoogieDeclarations]: Found specification of procedure reset_delta_events [2023-11-23 21:12:58,810 INFO L138 BoogieDeclarations]: Found implementation of procedure reset_delta_events [2023-11-23 21:12:58,811 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-23 21:12:58,811 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-23 21:12:58,811 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-23 21:12:58,930 INFO L241 CfgBuilder]: Building ICFG [2023-11-23 21:12:58,932 INFO L267 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-23 21:13:08,942 INFO L282 CfgBuilder]: Performing block encoding [2023-11-23 21:13:11,447 INFO L304 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-23 21:13:11,447 INFO L309 CfgBuilder]: Removed 7 assume(true) statements. [2023-11-23 21:13:11,450 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 09:13:11 BoogieIcfgContainer [2023-11-23 21:13:11,450 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-23 21:13:11,454 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-23 21:13:11,454 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-23 21:13:11,458 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-23 21:13:11,458 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 09:12:52" (1/3) ... [2023-11-23 21:13:11,459 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@129c43e4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 09:13:11, skipping insertion in model container [2023-11-23 21:13:11,459 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:12:57" (2/3) ... [2023-11-23 21:13:11,460 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@129c43e4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 09:13:11, skipping insertion in model container [2023-11-23 21:13:11,460 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 09:13:11" (3/3) ... [2023-11-23 21:13:11,462 INFO L112 eAbstractionObserver]: Analyzing ICFG Problem05_label49+token_ring.03.cil-1.c [2023-11-23 21:13:11,484 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-23 21:13:11,484 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 2 error locations. [2023-11-23 21:13:11,613 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-23 21:13:11,621 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;@55c3ae15, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-23 21:13:11,622 INFO L358 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2023-11-23 21:13:11,636 INFO L276 IsEmpty]: Start isEmpty. Operand has 1742 states, 1713 states have (on average 1.9725627553998832) internal successors, (3379), 1718 states have internal predecessors, (3379), 19 states have call successors, (19), 7 states have call predecessors, (19), 7 states have return successors, (19), 18 states have call predecessors, (19), 19 states have call successors, (19) [2023-11-23 21:13:11,652 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2023-11-23 21:13:11,653 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:13:11,655 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:13:11,655 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:13:11,663 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:13:11,664 INFO L85 PathProgramCache]: Analyzing trace with hash 1503082760, now seen corresponding path program 1 times [2023-11-23 21:13:11,676 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:13:11,677 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1041313796] [2023-11-23 21:13:11,677 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:13:11,678 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:13:11,898 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:13:12,212 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 21:13:12,213 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:13:12,213 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1041313796] [2023-11-23 21:13:12,214 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1041313796] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:13:12,215 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 21:13:12,215 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-11-23 21:13:12,217 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1090338299] [2023-11-23 21:13:12,218 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:13:12,223 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-23 21:13:12,224 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:13:12,274 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-23 21:13:12,274 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-23 21:13:12,283 INFO L87 Difference]: Start difference. First operand has 1742 states, 1713 states have (on average 1.9725627553998832) internal successors, (3379), 1718 states have internal predecessors, (3379), 19 states have call successors, (19), 7 states have call predecessors, (19), 7 states have return successors, (19), 18 states have call predecessors, (19), 19 states have call successors, (19) Second operand has 4 states, 4 states have (on average 7.5) internal successors, (30), 4 states have internal predecessors, (30), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2023-11-23 21:13:13,315 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:13:13,315 INFO L93 Difference]: Finished difference Result 3559 states and 6955 transitions. [2023-11-23 21:13:13,317 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-23 21:13:13,318 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 7.5) internal successors, (30), 4 states have internal predecessors, (30), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) Word has length 41 [2023-11-23 21:13:13,319 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:13:13,352 INFO L225 Difference]: With dead ends: 3559 [2023-11-23 21:13:13,352 INFO L226 Difference]: Without dead ends: 1816 [2023-11-23 21:13:13,364 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 21:13:13,369 INFO L413 NwaCegarLoop]: 3256 mSDtfsCounter, 3498 mSDsluCounter, 3192 mSDsCounter, 0 mSdLazyCounter, 586 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3498 SdHoareTripleChecker+Valid, 6448 SdHoareTripleChecker+Invalid, 600 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 586 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2023-11-23 21:13:13,370 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3498 Valid, 6448 Invalid, 600 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [14 Valid, 586 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2023-11-23 21:13:13,395 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1816 states. [2023-11-23 21:13:13,518 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1816 to 1815. [2023-11-23 21:13:13,525 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1815 states, 1769 states have (on average 1.9479932165065008) internal successors, (3446), 1773 states have internal predecessors, (3446), 32 states have call successors, (32), 13 states have call predecessors, (32), 12 states have return successors, (30), 29 states have call predecessors, (30), 30 states have call successors, (30) [2023-11-23 21:13:13,539 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1815 states to 1815 states and 3508 transitions. [2023-11-23 21:13:13,541 INFO L78 Accepts]: Start accepts. Automaton has 1815 states and 3508 transitions. Word has length 41 [2023-11-23 21:13:13,542 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:13:13,542 INFO L495 AbstractCegarLoop]: Abstraction has 1815 states and 3508 transitions. [2023-11-23 21:13:13,544 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 7.5) internal successors, (30), 4 states have internal predecessors, (30), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2023-11-23 21:13:13,545 INFO L276 IsEmpty]: Start isEmpty. Operand 1815 states and 3508 transitions. [2023-11-23 21:13:13,558 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2023-11-23 21:13:13,559 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:13:13,559 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:13:13,559 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-23 21:13:13,560 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:13:13,560 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:13:13,561 INFO L85 PathProgramCache]: Analyzing trace with hash -153585464, now seen corresponding path program 1 times [2023-11-23 21:13:13,561 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:13:13,562 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1113124354] [2023-11-23 21:13:13,562 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:13:13,563 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:13:13,624 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:13:13,837 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2023-11-23 21:13:13,838 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:13:13,838 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1113124354] [2023-11-23 21:13:13,839 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1113124354] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:13:13,839 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1889925852] [2023-11-23 21:13:13,839 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:13:13,840 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:13:13,840 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81be26ac-cc45-4fcc-b375-69635166c334/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:13:13,846 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81be26ac-cc45-4fcc-b375-69635166c334/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:13:13,870 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81be26ac-cc45-4fcc-b375-69635166c334/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-23 21:13:14,022 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:13:14,026 INFO L262 TraceCheckSpWp]: Trace formula consists of 424 conjuncts, 2 conjunts are in the unsatisfiable core [2023-11-23 21:13:14,037 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:13:14,109 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-11-23 21:13:14,109 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-23 21:13:14,112 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1889925852] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:13:14,113 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-23 21:13:14,113 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2023-11-23 21:13:14,114 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [329186852] [2023-11-23 21:13:14,115 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:13:14,116 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-23 21:13:14,116 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:13:14,117 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-23 21:13:14,117 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-23 21:13:14,117 INFO L87 Difference]: Start difference. First operand 1815 states and 3508 transitions. Second operand has 3 states, 3 states have (on average 16.666666666666668) internal successors, (50), 2 states have internal predecessors, (50), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-11-23 21:13:14,619 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:13:14,619 INFO L93 Difference]: Finished difference Result 2146 states and 3973 transitions. [2023-11-23 21:13:14,620 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-23 21:13:14,620 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 16.666666666666668) internal successors, (50), 2 states have internal predecessors, (50), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 75 [2023-11-23 21:13:14,621 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:13:14,638 INFO L225 Difference]: With dead ends: 2146 [2023-11-23 21:13:14,638 INFO L226 Difference]: Without dead ends: 1977 [2023-11-23 21:13:14,640 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 75 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-23 21:13:14,642 INFO L413 NwaCegarLoop]: 3207 mSDtfsCounter, 3375 mSDsluCounter, 101 mSDsCounter, 0 mSdLazyCounter, 265 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3375 SdHoareTripleChecker+Valid, 3308 SdHoareTripleChecker+Invalid, 267 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 265 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-11-23 21:13:14,643 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3375 Valid, 3308 Invalid, 267 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 265 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-11-23 21:13:14,648 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1977 states. [2023-11-23 21:13:14,708 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1977 to 1971. [2023-11-23 21:13:14,714 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1971 states, 1889 states have (on average 1.9105346744309157) internal successors, (3609), 1894 states have internal predecessors, (3609), 56 states have call successors, (56), 25 states have call predecessors, (56), 24 states have return successors, (54), 52 states have call predecessors, (54), 54 states have call successors, (54) [2023-11-23 21:13:14,729 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1971 states to 1971 states and 3719 transitions. [2023-11-23 21:13:14,729 INFO L78 Accepts]: Start accepts. Automaton has 1971 states and 3719 transitions. Word has length 75 [2023-11-23 21:13:14,730 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:13:14,730 INFO L495 AbstractCegarLoop]: Abstraction has 1971 states and 3719 transitions. [2023-11-23 21:13:14,730 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 16.666666666666668) internal successors, (50), 2 states have internal predecessors, (50), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-11-23 21:13:14,731 INFO L276 IsEmpty]: Start isEmpty. Operand 1971 states and 3719 transitions. [2023-11-23 21:13:14,733 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2023-11-23 21:13:14,733 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:13:14,734 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:13:14,760 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81be26ac-cc45-4fcc-b375-69635166c334/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-11-23 21:13:14,948 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81be26ac-cc45-4fcc-b375-69635166c334/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2023-11-23 21:13:14,949 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:13:14,949 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:13:14,949 INFO L85 PathProgramCache]: Analyzing trace with hash 975649162, now seen corresponding path program 1 times [2023-11-23 21:13:14,950 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:13:14,950 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1421453914] [2023-11-23 21:13:14,950 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:13:14,950 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:13:14,976 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:13:15,195 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2023-11-23 21:13:15,195 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:13:15,196 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1421453914] [2023-11-23 21:13:15,200 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1421453914] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:13:15,200 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [151114103] [2023-11-23 21:13:15,201 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:13:15,201 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:13:15,201 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81be26ac-cc45-4fcc-b375-69635166c334/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:13:15,202 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81be26ac-cc45-4fcc-b375-69635166c334/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:13:15,215 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81be26ac-cc45-4fcc-b375-69635166c334/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-23 21:13:15,355 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:13:15,358 INFO L262 TraceCheckSpWp]: Trace formula consists of 418 conjuncts, 2 conjunts are in the unsatisfiable core [2023-11-23 21:13:15,365 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:13:15,418 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2023-11-23 21:13:15,418 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-23 21:13:15,419 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [151114103] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:13:15,419 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-23 21:13:15,419 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2023-11-23 21:13:15,419 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2007803882] [2023-11-23 21:13:15,420 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:13:15,420 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-23 21:13:15,420 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:13:15,421 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-23 21:13:15,421 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-23 21:13:15,422 INFO L87 Difference]: Start difference. First operand 1971 states and 3719 transitions. Second operand has 3 states, 3 states have (on average 15.666666666666666) internal successors, (47), 2 states have internal predecessors, (47), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-11-23 21:13:15,952 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:13:15,953 INFO L93 Difference]: Finished difference Result 2608 states and 4606 transitions. [2023-11-23 21:13:15,953 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-23 21:13:15,953 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 15.666666666666666) internal successors, (47), 2 states have internal predecessors, (47), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 75 [2023-11-23 21:13:15,954 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:13:15,970 INFO L225 Difference]: With dead ends: 2608 [2023-11-23 21:13:15,970 INFO L226 Difference]: Without dead ends: 2283 [2023-11-23 21:13:15,973 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 75 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-23 21:13:15,974 INFO L413 NwaCegarLoop]: 3205 mSDtfsCounter, 3378 mSDsluCounter, 101 mSDsCounter, 0 mSdLazyCounter, 265 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3378 SdHoareTripleChecker+Valid, 3306 SdHoareTripleChecker+Invalid, 267 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 265 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-11-23 21:13:15,975 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3378 Valid, 3306 Invalid, 267 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 265 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-11-23 21:13:15,980 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2283 states. [2023-11-23 21:13:16,065 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2283 to 2275. [2023-11-23 21:13:16,074 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2275 states, 2123 states have (on average 1.8478568064060292) internal successors, (3923), 2130 states have internal predecessors, (3923), 102 states have call successors, (102), 49 states have call predecessors, (102), 48 states have return successors, (100), 96 states have call predecessors, (100), 100 states have call successors, (100) [2023-11-23 21:13:16,094 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2275 states to 2275 states and 4125 transitions. [2023-11-23 21:13:16,095 INFO L78 Accepts]: Start accepts. Automaton has 2275 states and 4125 transitions. Word has length 75 [2023-11-23 21:13:16,095 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:13:16,096 INFO L495 AbstractCegarLoop]: Abstraction has 2275 states and 4125 transitions. [2023-11-23 21:13:16,096 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 15.666666666666666) internal successors, (47), 2 states have internal predecessors, (47), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-11-23 21:13:16,096 INFO L276 IsEmpty]: Start isEmpty. Operand 2275 states and 4125 transitions. [2023-11-23 21:13:16,100 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2023-11-23 21:13:16,101 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:13:16,101 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:13:16,127 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81be26ac-cc45-4fcc-b375-69635166c334/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-11-23 21:13:16,317 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81be26ac-cc45-4fcc-b375-69635166c334/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2023-11-23 21:13:16,318 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:13:16,318 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:13:16,318 INFO L85 PathProgramCache]: Analyzing trace with hash -474437240, now seen corresponding path program 1 times [2023-11-23 21:13:16,319 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:13:16,319 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1980093250] [2023-11-23 21:13:16,319 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:13:16,319 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:13:16,360 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:13:16,902 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2023-11-23 21:13:16,902 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:13:16,903 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1980093250] [2023-11-23 21:13:16,905 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1980093250] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:13:16,906 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 21:13:16,906 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2023-11-23 21:13:16,908 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [155837671] [2023-11-23 21:13:16,908 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:13:16,910 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-11-23 21:13:16,911 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:13:16,911 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-11-23 21:13:16,912 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2023-11-23 21:13:16,912 INFO L87 Difference]: Start difference. First operand 2275 states and 4125 transitions. Second operand has 6 states, 6 states have (on average 7.333333333333333) internal successors, (44), 6 states have internal predecessors, (44), 4 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2023-11-23 21:13:18,180 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:13:18,180 INFO L93 Difference]: Finished difference Result 3579 states and 5883 transitions. [2023-11-23 21:13:18,181 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2023-11-23 21:13:18,181 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 7.333333333333333) internal successors, (44), 6 states have internal predecessors, (44), 4 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) Word has length 75 [2023-11-23 21:13:18,182 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:13:18,205 INFO L225 Difference]: With dead ends: 3579 [2023-11-23 21:13:18,205 INFO L226 Difference]: Without dead ends: 2951 [2023-11-23 21:13:18,209 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 21:13:18,210 INFO L413 NwaCegarLoop]: 3175 mSDtfsCounter, 3577 mSDsluCounter, 9412 mSDsCounter, 0 mSdLazyCounter, 1054 mSolverCounterSat, 82 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3589 SdHoareTripleChecker+Valid, 12587 SdHoareTripleChecker+Invalid, 1136 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 82 IncrementalHoareTripleChecker+Valid, 1054 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2023-11-23 21:13:18,211 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3589 Valid, 12587 Invalid, 1136 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [82 Valid, 1054 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2023-11-23 21:13:18,217 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2951 states. [2023-11-23 21:13:18,336 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2951 to 2851. [2023-11-23 21:13:18,344 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2851 states, 2563 states have (on average 1.7569254779555208) internal successors, (4503), 2574 states have internal predecessors, (4503), 190 states have call successors, (190), 97 states have call predecessors, (190), 96 states have return successors, (188), 180 states have call predecessors, (188), 188 states have call successors, (188) [2023-11-23 21:13:18,362 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2851 states to 2851 states and 4881 transitions. [2023-11-23 21:13:18,363 INFO L78 Accepts]: Start accepts. Automaton has 2851 states and 4881 transitions. Word has length 75 [2023-11-23 21:13:18,363 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:13:18,364 INFO L495 AbstractCegarLoop]: Abstraction has 2851 states and 4881 transitions. [2023-11-23 21:13:18,364 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 7.333333333333333) internal successors, (44), 6 states have internal predecessors, (44), 4 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2023-11-23 21:13:18,364 INFO L276 IsEmpty]: Start isEmpty. Operand 2851 states and 4881 transitions. [2023-11-23 21:13:18,368 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2023-11-23 21:13:18,368 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:13:18,368 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:13:18,369 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2023-11-23 21:13:18,369 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:13:18,369 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:13:18,370 INFO L85 PathProgramCache]: Analyzing trace with hash 1139237829, now seen corresponding path program 1 times [2023-11-23 21:13:18,370 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:13:18,370 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [530838644] [2023-11-23 21:13:18,370 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:13:18,371 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:13:18,391 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:13:18,604 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 10 proven. 14 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2023-11-23 21:13:18,606 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:13:18,606 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [530838644] [2023-11-23 21:13:18,607 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [530838644] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:13:18,607 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1726855338] [2023-11-23 21:13:18,607 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:13:18,607 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:13:18,608 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81be26ac-cc45-4fcc-b375-69635166c334/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:13:18,609 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81be26ac-cc45-4fcc-b375-69635166c334/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:13:18,642 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81be26ac-cc45-4fcc-b375-69635166c334/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-23 21:13:18,759 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:13:18,761 INFO L262 TraceCheckSpWp]: Trace formula consists of 443 conjuncts, 2 conjunts are in the unsatisfiable core [2023-11-23 21:13:18,773 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:13:18,811 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 19 proven. 0 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2023-11-23 21:13:18,812 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-23 21:13:18,812 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1726855338] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:13:18,812 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-23 21:13:18,813 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2023-11-23 21:13:18,816 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [34693220] [2023-11-23 21:13:18,816 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:13:18,817 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-23 21:13:18,817 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:13:18,818 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-23 21:13:18,818 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-11-23 21:13:18,819 INFO L87 Difference]: Start difference. First operand 2851 states and 4881 transitions. Second operand has 3 states, 3 states have (on average 17.666666666666668) internal successors, (53), 3 states have internal predecessors, (53), 3 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2023-11-23 21:13:19,531 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:13:19,532 INFO L93 Difference]: Finished difference Result 3802 states and 6174 transitions. [2023-11-23 21:13:19,536 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-23 21:13:19,537 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 17.666666666666668) internal successors, (53), 3 states have internal predecessors, (53), 3 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) Word has length 89 [2023-11-23 21:13:19,538 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:13:19,557 INFO L225 Difference]: With dead ends: 3802 [2023-11-23 21:13:19,557 INFO L226 Difference]: Without dead ends: 3166 [2023-11-23 21:13:19,561 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 96 GetRequests, 91 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-11-23 21:13:19,564 INFO L413 NwaCegarLoop]: 3218 mSDtfsCounter, 47 mSDsluCounter, 3168 mSDsCounter, 0 mSdLazyCounter, 482 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 47 SdHoareTripleChecker+Valid, 6386 SdHoareTripleChecker+Invalid, 482 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 482 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2023-11-23 21:13:19,565 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [47 Valid, 6386 Invalid, 482 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 482 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2023-11-23 21:13:19,570 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3166 states. [2023-11-23 21:13:19,704 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3166 to 3035. [2023-11-23 21:13:19,711 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3035 states, 2731 states have (on average 1.7396558037348957) internal successors, (4751), 2742 states have internal predecessors, (4751), 198 states have call successors, (198), 105 states have call predecessors, (198), 104 states have return successors, (196), 188 states have call predecessors, (196), 196 states have call successors, (196) [2023-11-23 21:13:19,737 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3035 states to 3035 states and 5145 transitions. [2023-11-23 21:13:19,738 INFO L78 Accepts]: Start accepts. Automaton has 3035 states and 5145 transitions. Word has length 89 [2023-11-23 21:13:19,741 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:13:19,741 INFO L495 AbstractCegarLoop]: Abstraction has 3035 states and 5145 transitions. [2023-11-23 21:13:19,741 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 17.666666666666668) internal successors, (53), 3 states have internal predecessors, (53), 3 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2023-11-23 21:13:19,741 INFO L276 IsEmpty]: Start isEmpty. Operand 3035 states and 5145 transitions. [2023-11-23 21:13:19,753 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2023-11-23 21:13:19,753 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:13:19,753 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:13:19,780 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81be26ac-cc45-4fcc-b375-69635166c334/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-11-23 21:13:19,968 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81be26ac-cc45-4fcc-b375-69635166c334/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:13:19,969 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:13:19,969 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:13:19,969 INFO L85 PathProgramCache]: Analyzing trace with hash -1076987692, now seen corresponding path program 1 times [2023-11-23 21:13:19,969 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:13:19,969 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1179266942] [2023-11-23 21:13:19,969 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:13:19,970 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:13:19,994 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:13:20,051 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2023-11-23 21:13:20,051 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:13:20,051 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1179266942] [2023-11-23 21:13:20,051 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1179266942] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:13:20,052 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 21:13:20,052 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-23 21:13:20,052 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [818088774] [2023-11-23 21:13:20,052 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:13:20,053 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-23 21:13:20,053 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:13:20,053 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-23 21:13:20,054 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-23 21:13:20,054 INFO L87 Difference]: Start difference. First operand 3035 states and 5145 transitions. Second operand has 3 states, 3 states have (on average 17.333333333333332) internal successors, (52), 3 states have internal predecessors, (52), 3 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2023-11-23 21:13:20,604 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:13:20,604 INFO L93 Difference]: Finished difference Result 5116 states and 7974 transitions. [2023-11-23 21:13:20,604 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-23 21:13:20,604 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 17.333333333333332) internal successors, (52), 3 states have internal predecessors, (52), 3 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 99 [2023-11-23 21:13:20,606 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:13:20,629 INFO L225 Difference]: With dead ends: 5116 [2023-11-23 21:13:20,630 INFO L226 Difference]: Without dead ends: 3727 [2023-11-23 21:13:20,635 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 21:13:20,636 INFO L413 NwaCegarLoop]: 3207 mSDtfsCounter, 3370 mSDsluCounter, 101 mSDsCounter, 0 mSdLazyCounter, 265 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3370 SdHoareTripleChecker+Valid, 3308 SdHoareTripleChecker+Invalid, 267 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 265 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-11-23 21:13:20,637 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3370 Valid, 3308 Invalid, 267 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 265 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-11-23 21:13:20,644 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3727 states. [2023-11-23 21:13:20,793 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3727 to 3711. [2023-11-23 21:13:20,803 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3711 states, 3263 states have (on average 1.6705485749310451) internal successors, (5451), 3278 states have internal predecessors, (5451), 290 states have call successors, (290), 157 states have call predecessors, (290), 156 states have return successors, (288), 276 states have call predecessors, (288), 288 states have call successors, (288) [2023-11-23 21:13:20,829 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3711 states to 3711 states and 6029 transitions. [2023-11-23 21:13:20,829 INFO L78 Accepts]: Start accepts. Automaton has 3711 states and 6029 transitions. Word has length 99 [2023-11-23 21:13:20,830 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:13:20,830 INFO L495 AbstractCegarLoop]: Abstraction has 3711 states and 6029 transitions. [2023-11-23 21:13:20,830 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 17.333333333333332) internal successors, (52), 3 states have internal predecessors, (52), 3 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2023-11-23 21:13:20,830 INFO L276 IsEmpty]: Start isEmpty. Operand 3711 states and 6029 transitions. [2023-11-23 21:13:20,839 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2023-11-23 21:13:20,839 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:13:20,839 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:13:20,839 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2023-11-23 21:13:20,840 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:13:20,840 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:13:20,840 INFO L85 PathProgramCache]: Analyzing trace with hash -1921938415, now seen corresponding path program 1 times [2023-11-23 21:13:20,841 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:13:20,841 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1911279522] [2023-11-23 21:13:20,841 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:13:20,841 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:13:20,859 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:13:21,088 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 10 proven. 27 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2023-11-23 21:13:21,088 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:13:21,089 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1911279522] [2023-11-23 21:13:21,089 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1911279522] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:13:21,089 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [29094221] [2023-11-23 21:13:21,089 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:13:21,089 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:13:21,089 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81be26ac-cc45-4fcc-b375-69635166c334/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:13:21,090 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81be26ac-cc45-4fcc-b375-69635166c334/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:13:21,108 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81be26ac-cc45-4fcc-b375-69635166c334/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-11-23 21:13:21,270 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:13:21,273 INFO L262 TraceCheckSpWp]: Trace formula consists of 544 conjuncts, 3 conjunts are in the unsatisfiable core [2023-11-23 21:13:21,276 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:13:21,318 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 62 proven. 0 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2023-11-23 21:13:21,318 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-23 21:13:21,318 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [29094221] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:13:21,319 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-23 21:13:21,319 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2023-11-23 21:13:21,319 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1865878014] [2023-11-23 21:13:21,319 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:13:21,320 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-23 21:13:21,320 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:13:21,320 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-23 21:13:21,320 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-11-23 21:13:21,321 INFO L87 Difference]: Start difference. First operand 3711 states and 6029 transitions. Second operand has 3 states, 3 states have (on average 27.0) internal successors, (81), 3 states have internal predecessors, (81), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2023-11-23 21:13:21,979 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:13:21,979 INFO L93 Difference]: Finished difference Result 5111 states and 7995 transitions. [2023-11-23 21:13:21,980 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-23 21:13:21,980 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 27.0) internal successors, (81), 3 states have internal predecessors, (81), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) Word has length 113 [2023-11-23 21:13:21,980 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:13:22,003 INFO L225 Difference]: With dead ends: 5111 [2023-11-23 21:13:22,003 INFO L226 Difference]: Without dead ends: 3723 [2023-11-23 21:13:22,009 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 120 GetRequests, 115 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-11-23 21:13:22,009 INFO L413 NwaCegarLoop]: 3221 mSDtfsCounter, 102 mSDsluCounter, 3158 mSDsCounter, 0 mSdLazyCounter, 482 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 102 SdHoareTripleChecker+Valid, 6379 SdHoareTripleChecker+Invalid, 484 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 482 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-11-23 21:13:22,010 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [102 Valid, 6379 Invalid, 484 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 482 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-11-23 21:13:22,016 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3723 states. [2023-11-23 21:13:22,171 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3723 to 3703. [2023-11-23 21:13:22,186 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3703 states, 3255 states have (on average 1.6599078341013824) internal successors, (5403), 3270 states have internal predecessors, (5403), 290 states have call successors, (290), 157 states have call predecessors, (290), 156 states have return successors, (288), 276 states have call predecessors, (288), 288 states have call successors, (288) [2023-11-23 21:13:22,206 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3703 states to 3703 states and 5981 transitions. [2023-11-23 21:13:22,207 INFO L78 Accepts]: Start accepts. Automaton has 3703 states and 5981 transitions. Word has length 113 [2023-11-23 21:13:22,207 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:13:22,207 INFO L495 AbstractCegarLoop]: Abstraction has 3703 states and 5981 transitions. [2023-11-23 21:13:22,208 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 27.0) internal successors, (81), 3 states have internal predecessors, (81), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2023-11-23 21:13:22,208 INFO L276 IsEmpty]: Start isEmpty. Operand 3703 states and 5981 transitions. [2023-11-23 21:13:22,218 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2023-11-23 21:13:22,218 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:13:22,219 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:13:22,244 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81be26ac-cc45-4fcc-b375-69635166c334/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-11-23 21:13:22,432 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81be26ac-cc45-4fcc-b375-69635166c334/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2023-11-23 21:13:22,433 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:13:22,433 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:13:22,433 INFO L85 PathProgramCache]: Analyzing trace with hash -756665551, now seen corresponding path program 1 times [2023-11-23 21:13:22,433 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:13:22,433 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [657832905] [2023-11-23 21:13:22,433 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:13:22,434 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:13:22,457 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:13:22,682 INFO L134 CoverageAnalysis]: Checked inductivity of 71 backedges. 10 proven. 25 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2023-11-23 21:13:22,683 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:13:22,683 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [657832905] [2023-11-23 21:13:22,683 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [657832905] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:13:22,683 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [350980150] [2023-11-23 21:13:22,683 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:13:22,683 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:13:22,684 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81be26ac-cc45-4fcc-b375-69635166c334/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:13:22,684 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81be26ac-cc45-4fcc-b375-69635166c334/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:13:22,704 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81be26ac-cc45-4fcc-b375-69635166c334/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-11-23 21:13:22,838 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:13:22,841 INFO L262 TraceCheckSpWp]: Trace formula consists of 550 conjuncts, 2 conjunts are in the unsatisfiable core [2023-11-23 21:13:22,844 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:13:22,874 INFO L134 CoverageAnalysis]: Checked inductivity of 71 backedges. 51 proven. 0 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2023-11-23 21:13:22,875 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-23 21:13:22,875 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [350980150] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:13:22,875 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-23 21:13:22,875 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2023-11-23 21:13:22,875 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [615202201] [2023-11-23 21:13:22,876 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:13:22,876 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-23 21:13:22,876 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:13:22,877 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-23 21:13:22,877 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-11-23 21:13:22,877 INFO L87 Difference]: Start difference. First operand 3703 states and 5981 transitions. Second operand has 3 states, 3 states have (on average 25.0) internal successors, (75), 3 states have internal predecessors, (75), 3 states have call successors, (11), 3 states have call predecessors, (11), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) [2023-11-23 21:13:23,373 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:13:23,373 INFO L93 Difference]: Finished difference Result 5523 states and 8362 transitions. [2023-11-23 21:13:23,374 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-23 21:13:23,374 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 25.0) internal successors, (75), 3 states have internal predecessors, (75), 3 states have call successors, (11), 3 states have call predecessors, (11), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) Word has length 113 [2023-11-23 21:13:23,374 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:13:23,399 INFO L225 Difference]: With dead ends: 5523 [2023-11-23 21:13:23,399 INFO L226 Difference]: Without dead ends: 4151 [2023-11-23 21:13:23,404 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 120 GetRequests, 115 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-11-23 21:13:23,405 INFO L413 NwaCegarLoop]: 3178 mSDtfsCounter, 3380 mSDsluCounter, 24 mSDsCounter, 0 mSdLazyCounter, 242 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3380 SdHoareTripleChecker+Valid, 3202 SdHoareTripleChecker+Invalid, 246 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 242 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-11-23 21:13:23,406 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3380 Valid, 3202 Invalid, 246 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 242 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-11-23 21:13:23,413 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4151 states. [2023-11-23 21:13:23,580 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4151 to 4151. [2023-11-23 21:13:23,586 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4151 states, 3639 states have (on average 1.606760098928277) internal successors, (5847), 3654 states have internal predecessors, (5847), 310 states have call successors, (310), 201 states have call predecessors, (310), 200 states have return successors, (308), 296 states have call predecessors, (308), 308 states have call successors, (308) [2023-11-23 21:13:23,600 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4151 states to 4151 states and 6465 transitions. [2023-11-23 21:13:23,600 INFO L78 Accepts]: Start accepts. Automaton has 4151 states and 6465 transitions. Word has length 113 [2023-11-23 21:13:23,601 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:13:23,601 INFO L495 AbstractCegarLoop]: Abstraction has 4151 states and 6465 transitions. [2023-11-23 21:13:23,601 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 25.0) internal successors, (75), 3 states have internal predecessors, (75), 3 states have call successors, (11), 3 states have call predecessors, (11), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) [2023-11-23 21:13:23,601 INFO L276 IsEmpty]: Start isEmpty. Operand 4151 states and 6465 transitions. [2023-11-23 21:13:23,609 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2023-11-23 21:13:23,610 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:13:23,610 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:13:23,631 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81be26ac-cc45-4fcc-b375-69635166c334/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-11-23 21:13:23,831 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81be26ac-cc45-4fcc-b375-69635166c334/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:13:23,831 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:13:23,832 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:13:23,832 INFO L85 PathProgramCache]: Analyzing trace with hash -1516024224, now seen corresponding path program 1 times [2023-11-23 21:13:23,832 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:13:23,832 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [941241725] [2023-11-23 21:13:23,832 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:13:23,833 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:13:23,852 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:13:24,117 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 10 proven. 26 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2023-11-23 21:13:24,118 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:13:24,118 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [941241725] [2023-11-23 21:13:24,118 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [941241725] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:13:24,118 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [149759516] [2023-11-23 21:13:24,118 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:13:24,119 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:13:24,119 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81be26ac-cc45-4fcc-b375-69635166c334/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:13:24,120 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81be26ac-cc45-4fcc-b375-69635166c334/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:13:24,144 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81be26ac-cc45-4fcc-b375-69635166c334/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-11-23 21:13:24,274 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:13:24,277 INFO L262 TraceCheckSpWp]: Trace formula consists of 549 conjuncts, 3 conjunts are in the unsatisfiable core [2023-11-23 21:13:24,280 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:13:24,312 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 54 proven. 0 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2023-11-23 21:13:24,313 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-23 21:13:24,313 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [149759516] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:13:24,313 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-23 21:13:24,313 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2023-11-23 21:13:24,313 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1984500150] [2023-11-23 21:13:24,314 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:13:24,314 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-23 21:13:24,314 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:13:24,315 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-23 21:13:24,315 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-11-23 21:13:24,315 INFO L87 Difference]: Start difference. First operand 4151 states and 6465 transitions. Second operand has 3 states, 3 states have (on average 26.333333333333332) internal successors, (79), 3 states have internal predecessors, (79), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2023-11-23 21:13:25,125 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:13:25,126 INFO L93 Difference]: Finished difference Result 7559 states and 10884 transitions. [2023-11-23 21:13:25,126 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-23 21:13:25,127 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 26.333333333333332) internal successors, (79), 3 states have internal predecessors, (79), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) Word has length 114 [2023-11-23 21:13:25,127 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:13:25,166 INFO L225 Difference]: With dead ends: 7559 [2023-11-23 21:13:25,166 INFO L226 Difference]: Without dead ends: 5055 [2023-11-23 21:13:25,173 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 121 GetRequests, 116 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-11-23 21:13:25,175 INFO L413 NwaCegarLoop]: 3181 mSDtfsCounter, 60 mSDsluCounter, 3149 mSDsCounter, 0 mSdLazyCounter, 472 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 60 SdHoareTripleChecker+Valid, 6330 SdHoareTripleChecker+Invalid, 474 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 472 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-11-23 21:13:25,176 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [60 Valid, 6330 Invalid, 474 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 472 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-11-23 21:13:25,183 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5055 states. [2023-11-23 21:13:25,397 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5055 to 4415. [2023-11-23 21:13:25,403 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4415 states, 3875 states have (on average 1.5976774193548386) internal successors, (6191), 3891 states have internal predecessors, (6191), 324 states have call successors, (324), 215 states have call predecessors, (324), 214 states have return successors, (322), 309 states have call predecessors, (322), 322 states have call successors, (322) [2023-11-23 21:13:25,418 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4415 states to 4415 states and 6837 transitions. [2023-11-23 21:13:25,419 INFO L78 Accepts]: Start accepts. Automaton has 4415 states and 6837 transitions. Word has length 114 [2023-11-23 21:13:25,419 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:13:25,420 INFO L495 AbstractCegarLoop]: Abstraction has 4415 states and 6837 transitions. [2023-11-23 21:13:25,420 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 26.333333333333332) internal successors, (79), 3 states have internal predecessors, (79), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2023-11-23 21:13:25,420 INFO L276 IsEmpty]: Start isEmpty. Operand 4415 states and 6837 transitions. [2023-11-23 21:13:25,431 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2023-11-23 21:13:25,432 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:13:25,432 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:13:25,455 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81be26ac-cc45-4fcc-b375-69635166c334/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2023-11-23 21:13:25,648 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81be26ac-cc45-4fcc-b375-69635166c334/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2023-11-23 21:13:25,649 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:13:25,649 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:13:25,649 INFO L85 PathProgramCache]: Analyzing trace with hash 978884863, now seen corresponding path program 1 times [2023-11-23 21:13:25,649 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:13:25,649 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [575508712] [2023-11-23 21:13:25,649 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:13:25,650 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:13:25,673 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:13:25,760 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 23 proven. 1 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2023-11-23 21:13:25,760 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:13:25,760 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [575508712] [2023-11-23 21:13:25,761 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [575508712] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:13:25,761 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [687520607] [2023-11-23 21:13:25,761 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:13:25,761 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:13:25,761 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81be26ac-cc45-4fcc-b375-69635166c334/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:13:25,762 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81be26ac-cc45-4fcc-b375-69635166c334/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:13:25,784 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81be26ac-cc45-4fcc-b375-69635166c334/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-11-23 21:13:25,917 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:13:25,920 INFO L262 TraceCheckSpWp]: Trace formula consists of 546 conjuncts, 2 conjunts are in the unsatisfiable core [2023-11-23 21:13:25,923 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:13:25,947 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 59 proven. 0 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2023-11-23 21:13:25,947 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-23 21:13:25,947 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [687520607] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:13:25,948 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-23 21:13:25,948 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [5] total 6 [2023-11-23 21:13:25,948 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [119731313] [2023-11-23 21:13:25,948 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:13:25,949 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-23 21:13:25,949 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:13:25,949 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-23 21:13:25,950 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2023-11-23 21:13:25,950 INFO L87 Difference]: Start difference. First operand 4415 states and 6837 transitions. Second operand has 3 states, 3 states have (on average 26.0) internal successors, (78), 3 states have internal predecessors, (78), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2023-11-23 21:13:26,628 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:13:26,628 INFO L93 Difference]: Finished difference Result 6851 states and 10037 transitions. [2023-11-23 21:13:26,628 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-23 21:13:26,629 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 26.0) internal successors, (78), 3 states have internal predecessors, (78), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) Word has length 114 [2023-11-23 21:13:26,629 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:13:26,646 INFO L225 Difference]: With dead ends: 6851 [2023-11-23 21:13:26,646 INFO L226 Difference]: Without dead ends: 5013 [2023-11-23 21:13:26,653 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 118 GetRequests, 114 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2023-11-23 21:13:26,653 INFO L413 NwaCegarLoop]: 3216 mSDtfsCounter, 63 mSDsluCounter, 3168 mSDsCounter, 0 mSdLazyCounter, 479 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 63 SdHoareTripleChecker+Valid, 6384 SdHoareTripleChecker+Invalid, 479 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 479 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-11-23 21:13:26,654 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [63 Valid, 6384 Invalid, 479 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 479 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-11-23 21:13:26,663 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5013 states. [2023-11-23 21:13:26,867 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5013 to 4735. [2023-11-23 21:13:26,875 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4735 states, 4163 states have (on average 1.5909200096084555) internal successors, (6623), 4179 states have internal predecessors, (6623), 340 states have call successors, (340), 231 states have call predecessors, (340), 230 states have return successors, (338), 325 states have call predecessors, (338), 338 states have call successors, (338) [2023-11-23 21:13:26,890 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4735 states to 4735 states and 7301 transitions. [2023-11-23 21:13:26,891 INFO L78 Accepts]: Start accepts. Automaton has 4735 states and 7301 transitions. Word has length 114 [2023-11-23 21:13:26,891 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:13:26,891 INFO L495 AbstractCegarLoop]: Abstraction has 4735 states and 7301 transitions. [2023-11-23 21:13:26,891 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 26.0) internal successors, (78), 3 states have internal predecessors, (78), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2023-11-23 21:13:26,892 INFO L276 IsEmpty]: Start isEmpty. Operand 4735 states and 7301 transitions. [2023-11-23 21:13:26,901 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2023-11-23 21:13:26,901 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:13:26,902 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:13:26,928 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81be26ac-cc45-4fcc-b375-69635166c334/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2023-11-23 21:13:27,123 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81be26ac-cc45-4fcc-b375-69635166c334/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2023-11-23 21:13:27,123 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:13:27,123 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:13:27,124 INFO L85 PathProgramCache]: Analyzing trace with hash -2022867159, now seen corresponding path program 1 times [2023-11-23 21:13:27,124 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:13:27,124 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1538971592] [2023-11-23 21:13:27,124 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:13:27,124 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:13:27,145 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:13:27,370 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 19 proven. 26 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2023-11-23 21:13:27,370 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:13:27,370 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1538971592] [2023-11-23 21:13:27,371 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1538971592] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:13:27,371 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [968223322] [2023-11-23 21:13:27,371 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:13:27,371 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:13:27,371 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81be26ac-cc45-4fcc-b375-69635166c334/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:13:27,372 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81be26ac-cc45-4fcc-b375-69635166c334/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:13:27,374 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81be26ac-cc45-4fcc-b375-69635166c334/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-11-23 21:13:27,525 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:13:27,528 INFO L262 TraceCheckSpWp]: Trace formula consists of 555 conjuncts, 6 conjunts are in the unsatisfiable core [2023-11-23 21:13:27,531 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:13:27,665 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 67 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-11-23 21:13:27,665 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-23 21:13:27,666 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [968223322] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:13:27,666 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-23 21:13:27,666 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [6] total 8 [2023-11-23 21:13:27,666 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1000676716] [2023-11-23 21:13:27,667 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:13:27,667 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-23 21:13:27,667 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:13:27,668 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-23 21:13:27,668 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2023-11-23 21:13:27,668 INFO L87 Difference]: Start difference. First operand 4735 states and 7301 transitions. Second operand has 4 states, 4 states have (on average 22.0) internal successors, (88), 4 states have internal predecessors, (88), 4 states have call successors, (11), 4 states have call predecessors, (11), 3 states have return successors, (10), 3 states have call predecessors, (10), 4 states have call successors, (10) [2023-11-23 21:13:28,453 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:13:28,454 INFO L93 Difference]: Finished difference Result 7669 states and 11201 transitions. [2023-11-23 21:13:28,454 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-23 21:13:28,454 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 22.0) internal successors, (88), 4 states have internal predecessors, (88), 4 states have call successors, (11), 4 states have call predecessors, (11), 3 states have return successors, (10), 3 states have call predecessors, (10), 4 states have call successors, (10) Word has length 116 [2023-11-23 21:13:28,455 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:13:28,472 INFO L225 Difference]: With dead ends: 7669 [2023-11-23 21:13:28,473 INFO L226 Difference]: Without dead ends: 6067 [2023-11-23 21:13:28,479 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 123 GetRequests, 117 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2023-11-23 21:13:28,479 INFO L413 NwaCegarLoop]: 3243 mSDtfsCounter, 6710 mSDsluCounter, 102 mSDsCounter, 0 mSdLazyCounter, 312 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6710 SdHoareTripleChecker+Valid, 3345 SdHoareTripleChecker+Invalid, 324 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 312 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-11-23 21:13:28,480 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [6710 Valid, 3345 Invalid, 324 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 312 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-11-23 21:13:28,489 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6067 states. [2023-11-23 21:13:28,792 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6067 to 5888. [2023-11-23 21:13:28,799 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5888 states, 5189 states have (on average 1.5328579687801118) internal successors, (7954), 5205 states have internal predecessors, (7954), 392 states have call successors, (392), 306 states have call predecessors, (392), 305 states have return successors, (412), 377 states have call predecessors, (412), 390 states have call successors, (412) [2023-11-23 21:13:28,818 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5888 states to 5888 states and 8758 transitions. [2023-11-23 21:13:28,818 INFO L78 Accepts]: Start accepts. Automaton has 5888 states and 8758 transitions. Word has length 116 [2023-11-23 21:13:28,819 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:13:28,819 INFO L495 AbstractCegarLoop]: Abstraction has 5888 states and 8758 transitions. [2023-11-23 21:13:28,819 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 22.0) internal successors, (88), 4 states have internal predecessors, (88), 4 states have call successors, (11), 4 states have call predecessors, (11), 3 states have return successors, (10), 3 states have call predecessors, (10), 4 states have call successors, (10) [2023-11-23 21:13:28,819 INFO L276 IsEmpty]: Start isEmpty. Operand 5888 states and 8758 transitions. [2023-11-23 21:13:28,830 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2023-11-23 21:13:28,830 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:13:28,830 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:13:28,851 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81be26ac-cc45-4fcc-b375-69635166c334/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2023-11-23 21:13:29,051 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81be26ac-cc45-4fcc-b375-69635166c334/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2023-11-23 21:13:29,051 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:13:29,052 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:13:29,052 INFO L85 PathProgramCache]: Analyzing trace with hash -588481209, now seen corresponding path program 1 times [2023-11-23 21:13:29,052 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:13:29,052 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1375673219] [2023-11-23 21:13:29,052 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:13:29,052 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:13:29,086 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:13:29,172 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 21 proven. 5 refuted. 0 times theorem prover too weak. 47 trivial. 0 not checked. [2023-11-23 21:13:29,172 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:13:29,172 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1375673219] [2023-11-23 21:13:29,172 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1375673219] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:13:29,173 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [311429215] [2023-11-23 21:13:29,173 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:13:29,173 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:13:29,173 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81be26ac-cc45-4fcc-b375-69635166c334/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:13:29,174 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81be26ac-cc45-4fcc-b375-69635166c334/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:13:29,201 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81be26ac-cc45-4fcc-b375-69635166c334/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2023-11-23 21:13:29,328 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:13:29,331 INFO L262 TraceCheckSpWp]: Trace formula consists of 559 conjuncts, 2 conjunts are in the unsatisfiable core [2023-11-23 21:13:29,334 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:13:29,359 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 59 proven. 0 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2023-11-23 21:13:29,359 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-23 21:13:29,359 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [311429215] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:13:29,360 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-23 21:13:29,360 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [5] total 6 [2023-11-23 21:13:29,360 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [458428747] [2023-11-23 21:13:29,360 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:13:29,361 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-23 21:13:29,361 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:13:29,361 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-23 21:13:29,362 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2023-11-23 21:13:29,362 INFO L87 Difference]: Start difference. First operand 5888 states and 8758 transitions. Second operand has 3 states, 3 states have (on average 27.0) internal successors, (81), 3 states have internal predecessors, (81), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2023-11-23 21:13:30,330 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:13:30,330 INFO L93 Difference]: Finished difference Result 9714 states and 13825 transitions. [2023-11-23 21:13:30,330 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-23 21:13:30,331 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 27.0) internal successors, (81), 3 states have internal predecessors, (81), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) Word has length 117 [2023-11-23 21:13:30,331 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:13:30,357 INFO L225 Difference]: With dead ends: 9714 [2023-11-23 21:13:30,358 INFO L226 Difference]: Without dead ends: 7524 [2023-11-23 21:13:30,365 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 121 GetRequests, 117 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2023-11-23 21:13:30,366 INFO L413 NwaCegarLoop]: 3243 mSDtfsCounter, 73 mSDsluCounter, 3170 mSDsCounter, 0 mSdLazyCounter, 484 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 73 SdHoareTripleChecker+Valid, 6413 SdHoareTripleChecker+Invalid, 484 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 484 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-11-23 21:13:30,366 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [73 Valid, 6413 Invalid, 484 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 484 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-11-23 21:13:30,381 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7524 states. [2023-11-23 21:13:30,703 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7524 to 6706. [2023-11-23 21:13:30,712 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 6706 states, 5917 states have (on average 1.514449890147034) internal successors, (8961), 5933 states have internal predecessors, (8961), 437 states have call successors, (437), 351 states have call predecessors, (437), 350 states have return successors, (457), 422 states have call predecessors, (457), 435 states have call successors, (457) [2023-11-23 21:13:30,735 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6706 states to 6706 states and 9855 transitions. [2023-11-23 21:13:30,735 INFO L78 Accepts]: Start accepts. Automaton has 6706 states and 9855 transitions. Word has length 117 [2023-11-23 21:13:30,736 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:13:30,736 INFO L495 AbstractCegarLoop]: Abstraction has 6706 states and 9855 transitions. [2023-11-23 21:13:30,736 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 27.0) internal successors, (81), 3 states have internal predecessors, (81), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2023-11-23 21:13:30,736 INFO L276 IsEmpty]: Start isEmpty. Operand 6706 states and 9855 transitions. [2023-11-23 21:13:30,750 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2023-11-23 21:13:30,750 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:13:30,750 INFO L195 NwaCegarLoop]: trace histogram [5, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:13:30,773 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81be26ac-cc45-4fcc-b375-69635166c334/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2023-11-23 21:13:30,951 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81be26ac-cc45-4fcc-b375-69635166c334/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:13:30,951 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:13:30,951 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:13:30,952 INFO L85 PathProgramCache]: Analyzing trace with hash 15978791, now seen corresponding path program 1 times [2023-11-23 21:13:30,952 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:13:30,952 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [886843233] [2023-11-23 21:13:30,952 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:13:30,952 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:13:30,978 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:13:31,373 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 12 proven. 26 refuted. 0 times theorem prover too weak. 44 trivial. 0 not checked. [2023-11-23 21:13:31,374 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:13:31,374 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [886843233] [2023-11-23 21:13:31,374 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [886843233] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:13:31,374 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1079276669] [2023-11-23 21:13:31,374 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:13:31,375 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:13:31,375 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81be26ac-cc45-4fcc-b375-69635166c334/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:13:31,376 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81be26ac-cc45-4fcc-b375-69635166c334/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:13:31,396 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81be26ac-cc45-4fcc-b375-69635166c334/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2023-11-23 21:13:31,546 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:13:31,549 INFO L262 TraceCheckSpWp]: Trace formula consists of 621 conjuncts, 8 conjunts are in the unsatisfiable core [2023-11-23 21:13:31,553 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:13:31,649 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 62 proven. 0 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2023-11-23 21:13:31,649 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-23 21:13:31,650 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1079276669] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:13:31,650 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-23 21:13:31,650 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [6] total 11 [2023-11-23 21:13:31,650 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2051289120] [2023-11-23 21:13:31,650 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:13:31,651 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-11-23 21:13:31,651 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:13:31,652 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-11-23 21:13:31,652 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=87, Unknown=0, NotChecked=0, Total=110 [2023-11-23 21:13:31,652 INFO L87 Difference]: Start difference. First operand 6706 states and 9855 transitions. Second operand has 7 states, 6 states have (on average 12.5) internal successors, (75), 6 states have internal predecessors, (75), 3 states have call successors, (16), 3 states have call predecessors, (16), 3 states have return successors, (15), 3 states have call predecessors, (15), 3 states have call successors, (15)