./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/combinations/Problem05_label41+token_ring.12.cil-2.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 30e01a73 Calling Ultimate with: /usr/lib/jvm/java-1.11.0-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_064c7419-6cb6-4406-9c82-cd63c2c0171d/bin/utaipan-verify-mE87zJ7Ire/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_064c7419-6cb6-4406-9c82-cd63c2c0171d/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_064c7419-6cb6-4406-9c82-cd63c2c0171d/bin/utaipan-verify-mE87zJ7Ire/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_064c7419-6cb6-4406-9c82-cd63c2c0171d/bin/utaipan-verify-mE87zJ7Ire/config/TaipanReach.xml -i ../../sv-benchmarks/c/combinations/Problem05_label41+token_ring.12.cil-2.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_064c7419-6cb6-4406-9c82-cd63c2c0171d/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_064c7419-6cb6-4406-9c82-cd63c2c0171d/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 b5cd7deef4282090ab6b6f93cd9f668fbdecc3b4b6223d600f0bc6a04f939e1e --- Real Ultimate output --- This is Ultimate 0.2.3-dev-30e01a7 [2023-11-23 21:28:47,024 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-23 21:28:47,183 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_064c7419-6cb6-4406-9c82-cd63c2c0171d/bin/utaipan-verify-mE87zJ7Ire/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-11-23 21:28:47,206 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-23 21:28:47,207 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-23 21:28:47,286 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-23 21:28:47,288 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-23 21:28:47,288 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-23 21:28:47,290 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-23 21:28:47,297 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-23 21:28:47,298 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-23 21:28:47,299 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-23 21:28:47,300 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-23 21:28:47,302 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-23 21:28:47,303 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-23 21:28:47,304 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-23 21:28:47,304 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-23 21:28:47,305 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-23 21:28:47,305 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-23 21:28:47,306 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-23 21:28:47,307 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-23 21:28:47,307 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-23 21:28:47,309 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-23 21:28:47,310 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-11-23 21:28:47,310 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-23 21:28:47,311 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-23 21:28:47,312 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-23 21:28:47,312 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-23 21:28:47,313 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-11-23 21:28:47,313 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-23 21:28:47,315 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-11-23 21:28:47,316 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-23 21:28:47,327 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-11-23 21:28:47,328 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-23 21:28:47,328 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-23 21:28:47,329 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-11-23 21:28:47,329 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-23 21:28:47,329 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-23 21:28:47,330 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-23 21:28:47,330 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-23 21:28:47,330 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-11-23 21:28:47,331 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-23 21:28:47,331 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-23 21:28:47,331 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-11-23 21:28:47,332 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-11-23 21:28:47,333 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-23 21:28:47,333 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-23 21:28:47,333 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_064c7419-6cb6-4406-9c82-cd63c2c0171d/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_064c7419-6cb6-4406-9c82-cd63c2c0171d/bin/utaipan-verify-mE87zJ7Ire Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> b5cd7deef4282090ab6b6f93cd9f668fbdecc3b4b6223d600f0bc6a04f939e1e [2023-11-23 21:28:47,797 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-23 21:28:47,845 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-23 21:28:47,849 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-23 21:28:47,852 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-23 21:28:47,853 INFO L274 PluginConnector]: CDTParser initialized [2023-11-23 21:28:47,855 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_064c7419-6cb6-4406-9c82-cd63c2c0171d/bin/utaipan-verify-mE87zJ7Ire/../../sv-benchmarks/c/combinations/Problem05_label41+token_ring.12.cil-2.c [2023-11-23 21:28:51,578 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-23 21:28:52,501 INFO L384 CDTParser]: Found 1 translation units. [2023-11-23 21:28:52,505 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_064c7419-6cb6-4406-9c82-cd63c2c0171d/sv-benchmarks/c/combinations/Problem05_label41+token_ring.12.cil-2.c [2023-11-23 21:28:52,583 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_064c7419-6cb6-4406-9c82-cd63c2c0171d/bin/utaipan-verify-mE87zJ7Ire/data/3474bc68b/1c90bb2b5caa40dcbc3e0e3dca8a1d01/FLAG51081a38f [2023-11-23 21:28:52,605 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_064c7419-6cb6-4406-9c82-cd63c2c0171d/bin/utaipan-verify-mE87zJ7Ire/data/3474bc68b/1c90bb2b5caa40dcbc3e0e3dca8a1d01 [2023-11-23 21:28:52,612 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-23 21:28:52,615 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-23 21:28:52,620 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-23 21:28:52,620 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-23 21:28:52,627 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-23 21:28:52,630 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 09:28:52" (1/1) ... [2023-11-23 21:28:52,631 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5f1cea23 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:28:52, skipping insertion in model container [2023-11-23 21:28:52,632 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 09:28:52" (1/1) ... [2023-11-23 21:28:53,035 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-23 21:28:55,913 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_064c7419-6cb6-4406-9c82-cd63c2c0171d/sv-benchmarks/c/combinations/Problem05_label41+token_ring.12.cil-2.c[376251,376264] [2023-11-23 21:28:55,950 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_064c7419-6cb6-4406-9c82-cd63c2c0171d/sv-benchmarks/c/combinations/Problem05_label41+token_ring.12.cil-2.c[383339,383352] [2023-11-23 21:28:56,326 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-23 21:28:56,343 INFO L202 MainTranslator]: Completed pre-run [2023-11-23 21:28:57,816 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_064c7419-6cb6-4406-9c82-cd63c2c0171d/sv-benchmarks/c/combinations/Problem05_label41+token_ring.12.cil-2.c[376251,376264] [2023-11-23 21:28:57,830 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_064c7419-6cb6-4406-9c82-cd63c2c0171d/sv-benchmarks/c/combinations/Problem05_label41+token_ring.12.cil-2.c[383339,383352] [2023-11-23 21:28:57,887 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-23 21:28:57,983 INFO L206 MainTranslator]: Completed translation [2023-11-23 21:28:57,983 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:28:57 WrapperNode [2023-11-23 21:28:57,984 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-23 21:28:57,985 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-23 21:28:57,985 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-23 21:28:57,986 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-23 21:28:57,994 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:28:57" (1/1) ... [2023-11-23 21:28:58,146 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:28:57" (1/1) ... [2023-11-23 21:28:58,601 INFO L138 Inliner]: procedures = 68, calls = 77, calls flagged for inlining = 46, calls inlined = 46, statements flattened = 13228 [2023-11-23 21:28:58,602 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-23 21:28:58,602 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-23 21:28:58,603 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-23 21:28:58,603 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-23 21:28:58,612 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:28:57" (1/1) ... [2023-11-23 21:28:58,613 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:28:57" (1/1) ... [2023-11-23 21:28:58,679 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:28:57" (1/1) ... [2023-11-23 21:28:58,679 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:28:57" (1/1) ... [2023-11-23 21:28:58,998 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:28:57" (1/1) ... [2023-11-23 21:28:59,054 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:28:57" (1/1) ... [2023-11-23 21:28:59,101 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:28:57" (1/1) ... [2023-11-23 21:28:59,123 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:28:57" (1/1) ... [2023-11-23 21:28:59,174 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-23 21:28:59,175 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-23 21:28:59,175 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-23 21:28:59,175 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-23 21:28:59,176 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:28:57" (1/1) ... [2023-11-23 21:28:59,182 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-23 21:28:59,194 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_064c7419-6cb6-4406-9c82-cd63c2c0171d/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:28:59,206 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_064c7419-6cb6-4406-9c82-cd63c2c0171d/bin/utaipan-verify-mE87zJ7Ire/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-23 21:28:59,240 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_064c7419-6cb6-4406-9c82-cd63c2c0171d/bin/utaipan-verify-mE87zJ7Ire/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-23 21:28:59,254 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-23 21:28:59,255 INFO L130 BoogieDeclarations]: Found specification of procedure activate_threads [2023-11-23 21:28:59,256 INFO L138 BoogieDeclarations]: Found implementation of procedure activate_threads [2023-11-23 21:28:59,256 INFO L130 BoogieDeclarations]: Found specification of procedure immediate_notify [2023-11-23 21:28:59,256 INFO L138 BoogieDeclarations]: Found implementation of procedure immediate_notify [2023-11-23 21:28:59,256 INFO L130 BoogieDeclarations]: Found specification of procedure update_channels [2023-11-23 21:28:59,257 INFO L138 BoogieDeclarations]: Found implementation of procedure update_channels [2023-11-23 21:28:59,257 INFO L130 BoogieDeclarations]: Found specification of procedure fire_delta_events [2023-11-23 21:28:59,257 INFO L138 BoogieDeclarations]: Found implementation of procedure fire_delta_events [2023-11-23 21:28:59,257 INFO L130 BoogieDeclarations]: Found specification of procedure exists_runnable_thread [2023-11-23 21:28:59,257 INFO L138 BoogieDeclarations]: Found implementation of procedure exists_runnable_thread [2023-11-23 21:28:59,257 INFO L130 BoogieDeclarations]: Found specification of procedure reset_delta_events [2023-11-23 21:28:59,257 INFO L138 BoogieDeclarations]: Found implementation of procedure reset_delta_events [2023-11-23 21:28:59,258 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-23 21:28:59,258 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-23 21:28:59,258 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-23 21:28:59,516 INFO L241 CfgBuilder]: Building ICFG [2023-11-23 21:28:59,519 INFO L267 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-23 21:29:10,030 INFO L282 CfgBuilder]: Performing block encoding [2023-11-23 21:29:12,877 INFO L304 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-23 21:29:12,877 INFO L309 CfgBuilder]: Removed 16 assume(true) statements. [2023-11-23 21:29:12,880 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 09:29:12 BoogieIcfgContainer [2023-11-23 21:29:12,880 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-23 21:29:12,883 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-23 21:29:12,883 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-23 21:29:12,887 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-23 21:29:12,887 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 09:28:52" (1/3) ... [2023-11-23 21:29:12,888 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2eec32f8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 09:29:12, skipping insertion in model container [2023-11-23 21:29:12,888 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:28:57" (2/3) ... [2023-11-23 21:29:12,888 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2eec32f8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 09:29:12, skipping insertion in model container [2023-11-23 21:29:12,889 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 09:29:12" (3/3) ... [2023-11-23 21:29:12,890 INFO L112 eAbstractionObserver]: Analyzing ICFG Problem05_label41+token_ring.12.cil-2.c [2023-11-23 21:29:12,912 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-23 21:29:12,912 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 2 error locations. [2023-11-23 21:29:13,005 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-23 21:29:13,012 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;@6f926cc7, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-23 21:29:13,012 INFO L358 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2023-11-23 21:29:13,025 INFO L276 IsEmpty]: Start isEmpty. Operand has 1844 states, 1809 states have (on average 1.94914317302377) internal successors, (3526), 1812 states have internal predecessors, (3526), 26 states have call successors, (26), 6 states have call predecessors, (26), 6 states have return successors, (26), 26 states have call predecessors, (26), 26 states have call successors, (26) [2023-11-23 21:29:13,052 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2023-11-23 21:29:13,053 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:29:13,054 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:29:13,054 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:29:13,060 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:29:13,060 INFO L85 PathProgramCache]: Analyzing trace with hash 453925802, now seen corresponding path program 1 times [2023-11-23 21:29:13,071 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:29:13,071 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [449873356] [2023-11-23 21:29:13,072 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:29:13,072 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:29:13,258 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:29:13,760 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 21:29:13,760 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:29:13,761 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [449873356] [2023-11-23 21:29:13,762 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [449873356] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:29:13,762 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 21:29:13,762 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-11-23 21:29:13,764 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [498216929] [2023-11-23 21:29:13,765 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:29:13,769 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-23 21:29:13,770 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:29:13,809 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-23 21:29:13,810 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-23 21:29:13,817 INFO L87 Difference]: Start difference. First operand has 1844 states, 1809 states have (on average 1.94914317302377) internal successors, (3526), 1812 states have internal predecessors, (3526), 26 states have call successors, (26), 6 states have call predecessors, (26), 6 states have return successors, (26), 26 states have call predecessors, (26), 26 states have call successors, (26) Second operand has 4 states, 4 states have (on average 14.25) internal successors, (57), 4 states have internal predecessors, (57), 2 states have call successors, (5), 1 states have call predecessors, (5), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2023-11-23 21:29:15,072 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:29:15,073 INFO L93 Difference]: Finished difference Result 3872 states and 7466 transitions. [2023-11-23 21:29:15,074 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-23 21:29:15,076 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 14.25) internal successors, (57), 4 states have internal predecessors, (57), 2 states have call successors, (5), 1 states have call predecessors, (5), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) Word has length 67 [2023-11-23 21:29:15,076 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:29:15,102 INFO L225 Difference]: With dead ends: 3872 [2023-11-23 21:29:15,103 INFO L226 Difference]: Without dead ends: 2027 [2023-11-23 21:29:15,112 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 21:29:15,116 INFO L413 NwaCegarLoop]: 3537 mSDtfsCounter, 3805 mSDsluCounter, 3439 mSDsCounter, 0 mSdLazyCounter, 726 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3805 SdHoareTripleChecker+Valid, 6976 SdHoareTripleChecker+Invalid, 740 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 726 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2023-11-23 21:29:15,117 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3805 Valid, 6976 Invalid, 740 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [14 Valid, 726 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2023-11-23 21:29:15,138 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2027 states. [2023-11-23 21:29:15,382 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2027 to 2026. [2023-11-23 21:29:15,389 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2026 states, 1964 states have (on average 1.9073319755600815) internal successors, (3746), 1967 states have internal predecessors, (3746), 48 states have call successors, (48), 12 states have call predecessors, (48), 12 states have return successors, (48), 47 states have call predecessors, (48), 48 states have call successors, (48) [2023-11-23 21:29:15,405 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2026 states to 2026 states and 3842 transitions. [2023-11-23 21:29:15,406 INFO L78 Accepts]: Start accepts. Automaton has 2026 states and 3842 transitions. Word has length 67 [2023-11-23 21:29:15,407 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:29:15,407 INFO L495 AbstractCegarLoop]: Abstraction has 2026 states and 3842 transitions. [2023-11-23 21:29:15,408 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 14.25) internal successors, (57), 4 states have internal predecessors, (57), 2 states have call successors, (5), 1 states have call predecessors, (5), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2023-11-23 21:29:15,408 INFO L276 IsEmpty]: Start isEmpty. Operand 2026 states and 3842 transitions. [2023-11-23 21:29:15,417 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2023-11-23 21:29:15,417 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:29:15,418 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:29:15,418 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-23 21:29:15,419 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:29:15,419 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:29:15,420 INFO L85 PathProgramCache]: Analyzing trace with hash -1966683170, now seen corresponding path program 1 times [2023-11-23 21:29:15,420 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:29:15,420 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1243367537] [2023-11-23 21:29:15,420 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:29:15,421 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:29:15,462 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:29:15,824 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 39 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2023-11-23 21:29:15,825 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:29:15,825 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1243367537] [2023-11-23 21:29:15,825 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1243367537] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:29:15,826 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1411734656] [2023-11-23 21:29:15,826 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:29:15,826 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:29:15,826 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_064c7419-6cb6-4406-9c82-cd63c2c0171d/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:29:15,832 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_064c7419-6cb6-4406-9c82-cd63c2c0171d/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:29:15,835 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_064c7419-6cb6-4406-9c82-cd63c2c0171d/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-23 21:29:16,095 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:29:16,101 INFO L262 TraceCheckSpWp]: Trace formula consists of 1041 conjuncts, 2 conjunts are in the unsatisfiable core [2023-11-23 21:29:16,112 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:29:16,210 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 29 proven. 0 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2023-11-23 21:29:16,211 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-23 21:29:16,211 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1411734656] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:29:16,211 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-23 21:29:16,211 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2023-11-23 21:29:16,212 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [273542530] [2023-11-23 21:29:16,212 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:29:16,213 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-23 21:29:16,214 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:29:16,214 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-23 21:29:16,215 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-23 21:29:16,215 INFO L87 Difference]: Start difference. First operand 2026 states and 3842 transitions. Second operand has 3 states, 3 states have (on average 34.666666666666664) internal successors, (104), 2 states have internal predecessors, (104), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-11-23 21:29:16,828 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:29:16,828 INFO L93 Difference]: Finished difference Result 2779 states and 4993 transitions. [2023-11-23 21:29:16,828 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-23 21:29:16,829 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 34.666666666666664) internal successors, (104), 2 states have internal predecessors, (104), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 137 [2023-11-23 21:29:16,829 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:29:16,849 INFO L225 Difference]: With dead ends: 2779 [2023-11-23 21:29:16,849 INFO L226 Difference]: Without dead ends: 2399 [2023-11-23 21:29:16,852 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 141 GetRequests, 137 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 21:29:16,853 INFO L413 NwaCegarLoop]: 3355 mSDtfsCounter, 3520 mSDsluCounter, 238 mSDsCounter, 0 mSdLazyCounter, 316 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3520 SdHoareTripleChecker+Valid, 3593 SdHoareTripleChecker+Invalid, 318 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 316 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-11-23 21:29:16,854 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3520 Valid, 3593 Invalid, 318 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 316 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-11-23 21:29:16,859 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2399 states. [2023-11-23 21:29:16,934 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2399 to 2395. [2023-11-23 21:29:16,941 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2395 states, 2279 states have (on average 1.8468626590609916) internal successors, (4209), 2283 states have internal predecessors, (4209), 90 states have call successors, (90), 24 states have call predecessors, (90), 24 states have return successors, (90), 88 states have call predecessors, (90), 90 states have call successors, (90) [2023-11-23 21:29:16,959 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2395 states to 2395 states and 4389 transitions. [2023-11-23 21:29:16,960 INFO L78 Accepts]: Start accepts. Automaton has 2395 states and 4389 transitions. Word has length 137 [2023-11-23 21:29:16,960 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:29:16,960 INFO L495 AbstractCegarLoop]: Abstraction has 2395 states and 4389 transitions. [2023-11-23 21:29:16,961 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 34.666666666666664) internal successors, (104), 2 states have internal predecessors, (104), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-11-23 21:29:16,961 INFO L276 IsEmpty]: Start isEmpty. Operand 2395 states and 4389 transitions. [2023-11-23 21:29:16,965 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2023-11-23 21:29:16,966 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:29:16,966 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:29:16,994 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_064c7419-6cb6-4406-9c82-cd63c2c0171d/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-11-23 21:29:17,189 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_064c7419-6cb6-4406-9c82-cd63c2c0171d/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:29:17,189 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:29:17,190 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:29:17,190 INFO L85 PathProgramCache]: Analyzing trace with hash -1937796930, now seen corresponding path program 1 times [2023-11-23 21:29:17,190 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:29:17,190 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1079301465] [2023-11-23 21:29:17,191 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:29:17,191 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:29:17,227 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:29:17,410 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 39 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2023-11-23 21:29:17,410 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:29:17,410 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1079301465] [2023-11-23 21:29:17,412 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1079301465] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:29:17,413 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [132947328] [2023-11-23 21:29:17,413 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:29:17,413 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:29:17,413 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_064c7419-6cb6-4406-9c82-cd63c2c0171d/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:29:17,418 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_064c7419-6cb6-4406-9c82-cd63c2c0171d/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:29:17,441 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_064c7419-6cb6-4406-9c82-cd63c2c0171d/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-23 21:29:17,683 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:29:17,688 INFO L262 TraceCheckSpWp]: Trace formula consists of 1035 conjuncts, 2 conjunts are in the unsatisfiable core [2023-11-23 21:29:17,695 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:29:17,735 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 39 trivial. 0 not checked. [2023-11-23 21:29:17,735 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-23 21:29:17,735 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [132947328] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:29:17,735 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-23 21:29:17,735 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2023-11-23 21:29:17,736 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1719663053] [2023-11-23 21:29:17,736 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:29:17,737 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-23 21:29:17,737 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:29:17,737 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-23 21:29:17,738 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-23 21:29:17,738 INFO L87 Difference]: Start difference. First operand 2395 states and 4389 transitions. Second operand has 3 states, 3 states have (on average 28.666666666666668) internal successors, (86), 2 states have internal predecessors, (86), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-11-23 21:29:18,328 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:29:18,328 INFO L93 Difference]: Finished difference Result 3880 states and 6652 transitions. [2023-11-23 21:29:18,329 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-23 21:29:18,329 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 28.666666666666668) internal successors, (86), 2 states have internal predecessors, (86), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 137 [2023-11-23 21:29:18,329 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:29:18,351 INFO L225 Difference]: With dead ends: 3880 [2023-11-23 21:29:18,351 INFO L226 Difference]: Without dead ends: 3131 [2023-11-23 21:29:18,356 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 141 GetRequests, 137 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 21:29:18,357 INFO L413 NwaCegarLoop]: 3353 mSDtfsCounter, 3538 mSDsluCounter, 238 mSDsCounter, 0 mSdLazyCounter, 316 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3538 SdHoareTripleChecker+Valid, 3591 SdHoareTripleChecker+Invalid, 318 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 316 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-11-23 21:29:18,358 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3538 Valid, 3591 Invalid, 318 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 316 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-11-23 21:29:18,364 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3131 states. [2023-11-23 21:29:18,492 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3131 to 3125. [2023-11-23 21:29:18,503 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3125 states, 2903 states have (on average 1.764726145366862) internal successors, (5123), 2909 states have internal predecessors, (5123), 172 states have call successors, (172), 48 states have call predecessors, (172), 48 states have return successors, (172), 168 states have call predecessors, (172), 172 states have call successors, (172) [2023-11-23 21:29:18,527 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3125 states to 3125 states and 5467 transitions. [2023-11-23 21:29:18,527 INFO L78 Accepts]: Start accepts. Automaton has 3125 states and 5467 transitions. Word has length 137 [2023-11-23 21:29:18,528 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:29:18,528 INFO L495 AbstractCegarLoop]: Abstraction has 3125 states and 5467 transitions. [2023-11-23 21:29:18,528 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 28.666666666666668) internal successors, (86), 2 states have internal predecessors, (86), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-11-23 21:29:18,529 INFO L276 IsEmpty]: Start isEmpty. Operand 3125 states and 5467 transitions. [2023-11-23 21:29:18,535 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2023-11-23 21:29:18,535 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:29:18,536 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:29:18,568 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_064c7419-6cb6-4406-9c82-cd63c2c0171d/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-11-23 21:29:18,758 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_064c7419-6cb6-4406-9c82-cd63c2c0171d/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:29:18,758 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:29:18,758 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:29:18,759 INFO L85 PathProgramCache]: Analyzing trace with hash -131801698, now seen corresponding path program 1 times [2023-11-23 21:29:18,759 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:29:18,759 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1610783336] [2023-11-23 21:29:18,759 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:29:18,759 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:29:18,790 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:29:18,977 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 39 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2023-11-23 21:29:18,977 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:29:18,980 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1610783336] [2023-11-23 21:29:18,982 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1610783336] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:29:18,986 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [188985550] [2023-11-23 21:29:18,986 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:29:18,987 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:29:18,987 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_064c7419-6cb6-4406-9c82-cd63c2c0171d/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:29:18,988 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_064c7419-6cb6-4406-9c82-cd63c2c0171d/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:29:19,005 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_064c7419-6cb6-4406-9c82-cd63c2c0171d/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-23 21:29:19,242 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:29:19,247 INFO L262 TraceCheckSpWp]: Trace formula consists of 1029 conjuncts, 2 conjunts are in the unsatisfiable core [2023-11-23 21:29:19,252 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:29:19,305 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 17 proven. 0 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2023-11-23 21:29:19,305 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-23 21:29:19,306 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [188985550] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:29:19,306 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-23 21:29:19,306 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2023-11-23 21:29:19,306 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1216835128] [2023-11-23 21:29:19,307 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:29:19,307 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-23 21:29:19,307 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:29:19,309 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-23 21:29:19,309 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-23 21:29:19,309 INFO L87 Difference]: Start difference. First operand 3125 states and 5467 transitions. Second operand has 3 states, 3 states have (on average 30.666666666666668) internal successors, (92), 2 states have internal predecessors, (92), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-11-23 21:29:19,940 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:29:19,941 INFO L93 Difference]: Finished difference Result 6058 states and 9920 transitions. [2023-11-23 21:29:19,941 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-23 21:29:19,941 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 30.666666666666668) internal successors, (92), 2 states have internal predecessors, (92), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 137 [2023-11-23 21:29:19,942 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:29:19,975 INFO L225 Difference]: With dead ends: 6058 [2023-11-23 21:29:19,975 INFO L226 Difference]: Without dead ends: 4579 [2023-11-23 21:29:19,983 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 141 GetRequests, 137 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 21:29:19,985 INFO L413 NwaCegarLoop]: 3302 mSDtfsCounter, 3532 mSDsluCounter, 238 mSDsCounter, 0 mSdLazyCounter, 313 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3532 SdHoareTripleChecker+Valid, 3540 SdHoareTripleChecker+Invalid, 315 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 313 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-11-23 21:29:19,987 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3532 Valid, 3540 Invalid, 315 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 313 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-11-23 21:29:19,996 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4579 states. [2023-11-23 21:29:20,161 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4579 to 4569. [2023-11-23 21:29:20,172 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4569 states, 4139 states have (on average 1.673592655230732) internal successors, (6927), 4149 states have internal predecessors, (6927), 332 states have call successors, (332), 96 states have call predecessors, (332), 96 states have return successors, (332), 324 states have call predecessors, (332), 332 states have call successors, (332) [2023-11-23 21:29:20,194 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4569 states to 4569 states and 7591 transitions. [2023-11-23 21:29:20,195 INFO L78 Accepts]: Start accepts. Automaton has 4569 states and 7591 transitions. Word has length 137 [2023-11-23 21:29:20,195 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:29:20,195 INFO L495 AbstractCegarLoop]: Abstraction has 4569 states and 7591 transitions. [2023-11-23 21:29:20,195 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 30.666666666666668) internal successors, (92), 2 states have internal predecessors, (92), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-11-23 21:29:20,196 INFO L276 IsEmpty]: Start isEmpty. Operand 4569 states and 7591 transitions. [2023-11-23 21:29:20,204 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2023-11-23 21:29:20,204 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:29:20,205 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:29:20,232 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_064c7419-6cb6-4406-9c82-cd63c2c0171d/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-11-23 21:29:20,421 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_064c7419-6cb6-4406-9c82-cd63c2c0171d/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:29:20,421 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:29:20,422 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:29:20,422 INFO L85 PathProgramCache]: Analyzing trace with hash 696078974, now seen corresponding path program 1 times [2023-11-23 21:29:20,422 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:29:20,422 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [593902720] [2023-11-23 21:29:20,422 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:29:20,422 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:29:20,453 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:29:20,619 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 39 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2023-11-23 21:29:20,620 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:29:20,620 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [593902720] [2023-11-23 21:29:20,620 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [593902720] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:29:20,620 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1857751568] [2023-11-23 21:29:20,620 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:29:20,621 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:29:20,625 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_064c7419-6cb6-4406-9c82-cd63c2c0171d/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:29:20,626 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_064c7419-6cb6-4406-9c82-cd63c2c0171d/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:29:20,648 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_064c7419-6cb6-4406-9c82-cd63c2c0171d/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-11-23 21:29:20,882 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:29:20,887 INFO L262 TraceCheckSpWp]: Trace formula consists of 1023 conjuncts, 2 conjunts are in the unsatisfiable core [2023-11-23 21:29:20,891 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:29:20,932 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2023-11-23 21:29:20,932 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-23 21:29:20,932 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1857751568] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:29:20,932 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-23 21:29:20,933 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2023-11-23 21:29:20,933 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [416415630] [2023-11-23 21:29:20,933 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:29:20,934 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-23 21:29:20,934 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:29:20,935 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-23 21:29:20,935 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-23 21:29:20,935 INFO L87 Difference]: Start difference. First operand 4569 states and 7591 transitions. Second operand has 3 states, 3 states have (on average 27.666666666666668) internal successors, (83), 2 states have internal predecessors, (83), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-11-23 21:29:21,612 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:29:21,612 INFO L93 Difference]: Finished difference Result 10366 states and 16356 transitions. [2023-11-23 21:29:21,613 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-23 21:29:21,613 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 27.666666666666668) internal successors, (83), 2 states have internal predecessors, (83), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 137 [2023-11-23 21:29:21,613 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:29:21,665 INFO L225 Difference]: With dead ends: 10366 [2023-11-23 21:29:21,665 INFO L226 Difference]: Without dead ends: 7443 [2023-11-23 21:29:21,681 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 141 GetRequests, 137 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 21:29:21,682 INFO L413 NwaCegarLoop]: 3349 mSDtfsCounter, 3541 mSDsluCounter, 238 mSDsCounter, 0 mSdLazyCounter, 316 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3541 SdHoareTripleChecker+Valid, 3587 SdHoareTripleChecker+Invalid, 318 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 316 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-11-23 21:29:21,682 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3541 Valid, 3587 Invalid, 318 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 316 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-11-23 21:29:21,694 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7443 states. [2023-11-23 21:29:22,099 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7443 to 7425. [2023-11-23 21:29:22,123 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 7425 states, 6587 states have (on average 1.5920752998330043) internal successors, (10487), 6605 states have internal predecessors, (10487), 644 states have call successors, (644), 192 states have call predecessors, (644), 192 states have return successors, (644), 628 states have call predecessors, (644), 644 states have call successors, (644) [2023-11-23 21:29:22,158 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7425 states to 7425 states and 11775 transitions. [2023-11-23 21:29:22,158 INFO L78 Accepts]: Start accepts. Automaton has 7425 states and 11775 transitions. Word has length 137 [2023-11-23 21:29:22,159 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:29:22,159 INFO L495 AbstractCegarLoop]: Abstraction has 7425 states and 11775 transitions. [2023-11-23 21:29:22,160 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 27.666666666666668) internal successors, (83), 2 states have internal predecessors, (83), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-11-23 21:29:22,160 INFO L276 IsEmpty]: Start isEmpty. Operand 7425 states and 11775 transitions. [2023-11-23 21:29:22,175 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2023-11-23 21:29:22,175 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:29:22,175 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:29:22,198 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_064c7419-6cb6-4406-9c82-cd63c2c0171d/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2023-11-23 21:29:22,398 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_064c7419-6cb6-4406-9c82-cd63c2c0171d/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:29:22,398 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:29:22,399 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:29:22,399 INFO L85 PathProgramCache]: Analyzing trace with hash 44718494, now seen corresponding path program 1 times [2023-11-23 21:29:22,399 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:29:22,399 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [866002003] [2023-11-23 21:29:22,399 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:29:22,399 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:29:22,437 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:29:22,643 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 39 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2023-11-23 21:29:22,644 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:29:22,644 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [866002003] [2023-11-23 21:29:22,644 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [866002003] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:29:22,644 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1292463828] [2023-11-23 21:29:22,644 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:29:22,644 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:29:22,644 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_064c7419-6cb6-4406-9c82-cd63c2c0171d/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:29:22,645 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_064c7419-6cb6-4406-9c82-cd63c2c0171d/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:29:22,661 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_064c7419-6cb6-4406-9c82-cd63c2c0171d/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-11-23 21:29:22,898 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:29:22,903 INFO L262 TraceCheckSpWp]: Trace formula consists of 1017 conjuncts, 2 conjunts are in the unsatisfiable core [2023-11-23 21:29:22,908 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:29:22,985 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 38 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-11-23 21:29:22,986 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-23 21:29:22,986 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1292463828] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:29:22,986 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-23 21:29:22,986 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2023-11-23 21:29:22,987 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [626983718] [2023-11-23 21:29:22,987 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:29:22,987 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-23 21:29:22,988 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:29:22,988 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-23 21:29:22,988 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-23 21:29:22,989 INFO L87 Difference]: Start difference. First operand 7425 states and 11775 transitions. Second operand has 3 states, 3 states have (on average 37.666666666666664) internal successors, (113), 2 states have internal predecessors, (113), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-11-23 21:29:23,767 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:29:23,768 INFO L93 Difference]: Finished difference Result 18886 states and 29028 transitions. [2023-11-23 21:29:23,768 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-23 21:29:23,768 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 37.666666666666664) internal successors, (113), 2 states have internal predecessors, (113), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 137 [2023-11-23 21:29:23,769 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:29:23,862 INFO L225 Difference]: With dead ends: 18886 [2023-11-23 21:29:23,862 INFO L226 Difference]: Without dead ends: 13107 [2023-11-23 21:29:23,886 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 141 GetRequests, 137 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 21:29:23,887 INFO L413 NwaCegarLoop]: 3302 mSDtfsCounter, 3511 mSDsluCounter, 238 mSDsCounter, 0 mSdLazyCounter, 313 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3511 SdHoareTripleChecker+Valid, 3540 SdHoareTripleChecker+Invalid, 315 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 313 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-11-23 21:29:23,888 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3511 Valid, 3540 Invalid, 315 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 313 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-11-23 21:29:23,907 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13107 states. [2023-11-23 21:29:24,380 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13107 to 13073. [2023-11-23 21:29:24,401 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13073 states, 11435 states have (on average 1.5313511149978136) internal successors, (17511), 11469 states have internal predecessors, (17511), 1252 states have call successors, (1252), 384 states have call predecessors, (1252), 384 states have return successors, (1252), 1220 states have call predecessors, (1252), 1252 states have call successors, (1252) [2023-11-23 21:29:24,449 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13073 states to 13073 states and 20015 transitions. [2023-11-23 21:29:24,450 INFO L78 Accepts]: Start accepts. Automaton has 13073 states and 20015 transitions. Word has length 137 [2023-11-23 21:29:24,450 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:29:24,450 INFO L495 AbstractCegarLoop]: Abstraction has 13073 states and 20015 transitions. [2023-11-23 21:29:24,451 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 37.666666666666664) internal successors, (113), 2 states have internal predecessors, (113), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-11-23 21:29:24,451 INFO L276 IsEmpty]: Start isEmpty. Operand 13073 states and 20015 transitions. [2023-11-23 21:29:24,475 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2023-11-23 21:29:24,475 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:29:24,476 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:29:24,497 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_064c7419-6cb6-4406-9c82-cd63c2c0171d/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-11-23 21:29:24,697 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_064c7419-6cb6-4406-9c82-cd63c2c0171d/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:29:24,697 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:29:24,697 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:29:24,698 INFO L85 PathProgramCache]: Analyzing trace with hash -1569285954, now seen corresponding path program 1 times [2023-11-23 21:29:24,698 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:29:24,698 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1133867087] [2023-11-23 21:29:24,698 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:29:24,698 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:29:24,740 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:29:24,903 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 39 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2023-11-23 21:29:24,904 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:29:24,904 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1133867087] [2023-11-23 21:29:24,904 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1133867087] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:29:24,904 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1995924750] [2023-11-23 21:29:24,904 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:29:24,905 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:29:24,905 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_064c7419-6cb6-4406-9c82-cd63c2c0171d/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:29:24,906 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_064c7419-6cb6-4406-9c82-cd63c2c0171d/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:29:24,929 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_064c7419-6cb6-4406-9c82-cd63c2c0171d/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-11-23 21:29:25,163 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:29:25,168 INFO L262 TraceCheckSpWp]: Trace formula consists of 1011 conjuncts, 2 conjunts are in the unsatisfiable core [2023-11-23 21:29:25,172 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:29:25,248 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 35 proven. 0 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2023-11-23 21:29:25,249 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-23 21:29:25,249 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1995924750] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:29:25,249 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-23 21:29:25,249 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2023-11-23 21:29:25,250 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [777792509] [2023-11-23 21:29:25,250 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:29:25,253 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-23 21:29:25,253 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:29:25,253 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-23 21:29:25,254 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-23 21:29:25,254 INFO L87 Difference]: Start difference. First operand 13073 states and 20015 transitions. Second operand has 3 states, 3 states have (on average 36.666666666666664) internal successors, (110), 2 states have internal predecessors, (110), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-11-23 21:29:26,558 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:29:26,558 INFO L93 Difference]: Finished difference Result 35734 states and 53972 transitions. [2023-11-23 21:29:26,558 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-23 21:29:26,559 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 36.666666666666664) internal successors, (110), 2 states have internal predecessors, (110), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 137 [2023-11-23 21:29:26,559 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:29:26,664 INFO L225 Difference]: With dead ends: 35734 [2023-11-23 21:29:26,664 INFO L226 Difference]: Without dead ends: 24307 [2023-11-23 21:29:26,715 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 141 GetRequests, 137 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 21:29:26,715 INFO L413 NwaCegarLoop]: 3302 mSDtfsCounter, 3514 mSDsluCounter, 238 mSDsCounter, 0 mSdLazyCounter, 313 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3514 SdHoareTripleChecker+Valid, 3540 SdHoareTripleChecker+Invalid, 315 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 313 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-11-23 21:29:26,716 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3514 Valid, 3540 Invalid, 315 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 313 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-11-23 21:29:26,756 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24307 states. [2023-11-23 21:29:27,881 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24307 to 24241. [2023-11-23 21:29:27,914 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24241 states, 21035 states have (on average 1.4911813643926788) internal successors, (31367), 21101 states have internal predecessors, (31367), 2436 states have call successors, (2436), 768 states have call predecessors, (2436), 768 states have return successors, (2436), 2372 states have call predecessors, (2436), 2436 states have call successors, (2436) [2023-11-23 21:29:28,023 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24241 states to 24241 states and 36239 transitions. [2023-11-23 21:29:28,025 INFO L78 Accepts]: Start accepts. Automaton has 24241 states and 36239 transitions. Word has length 137 [2023-11-23 21:29:28,026 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:29:28,026 INFO L495 AbstractCegarLoop]: Abstraction has 24241 states and 36239 transitions. [2023-11-23 21:29:28,027 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 36.666666666666664) internal successors, (110), 2 states have internal predecessors, (110), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-11-23 21:29:28,027 INFO L276 IsEmpty]: Start isEmpty. Operand 24241 states and 36239 transitions. [2023-11-23 21:29:28,086 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2023-11-23 21:29:28,086 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:29:28,086 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:29:28,114 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_064c7419-6cb6-4406-9c82-cd63c2c0171d/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2023-11-23 21:29:28,309 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_064c7419-6cb6-4406-9c82-cd63c2c0171d/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:29:28,309 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:29:28,309 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:29:28,310 INFO L85 PathProgramCache]: Analyzing trace with hash 2078049694, now seen corresponding path program 1 times [2023-11-23 21:29:28,310 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:29:28,310 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1462491546] [2023-11-23 21:29:28,310 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:29:28,310 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:29:28,369 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:29:28,576 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 39 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2023-11-23 21:29:28,577 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:29:28,577 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1462491546] [2023-11-23 21:29:28,577 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1462491546] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:29:28,577 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [600739795] [2023-11-23 21:29:28,577 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:29:28,578 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:29:28,578 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_064c7419-6cb6-4406-9c82-cd63c2c0171d/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:29:28,579 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_064c7419-6cb6-4406-9c82-cd63c2c0171d/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:29:28,601 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_064c7419-6cb6-4406-9c82-cd63c2c0171d/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-11-23 21:29:28,837 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:29:28,841 INFO L262 TraceCheckSpWp]: Trace formula consists of 1005 conjuncts, 2 conjunts are in the unsatisfiable core [2023-11-23 21:29:28,845 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:29:28,896 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 23 proven. 0 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2023-11-23 21:29:28,897 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-23 21:29:28,897 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [600739795] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:29:28,897 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-23 21:29:28,897 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2023-11-23 21:29:28,897 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1502932544] [2023-11-23 21:29:28,898 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:29:28,898 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-23 21:29:28,898 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:29:28,899 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-23 21:29:28,899 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-23 21:29:28,899 INFO L87 Difference]: Start difference. First operand 24241 states and 36239 transitions. Second operand has 3 states, 3 states have (on average 32.666666666666664) internal successors, (98), 2 states have internal predecessors, (98), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-11-23 21:29:30,855 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:29:30,855 INFO L93 Difference]: Finished difference Result 69046 states and 103060 transitions. [2023-11-23 21:29:30,856 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-23 21:29:30,856 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 32.666666666666664) internal successors, (98), 2 states have internal predecessors, (98), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 137 [2023-11-23 21:29:30,856 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:29:31,035 INFO L225 Difference]: With dead ends: 69046 [2023-11-23 21:29:31,035 INFO L226 Difference]: Without dead ends: 46451 [2023-11-23 21:29:31,096 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 141 GetRequests, 137 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 21:29:31,097 INFO L413 NwaCegarLoop]: 3302 mSDtfsCounter, 3526 mSDsluCounter, 238 mSDsCounter, 0 mSdLazyCounter, 313 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3526 SdHoareTripleChecker+Valid, 3540 SdHoareTripleChecker+Invalid, 315 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 313 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-11-23 21:29:31,098 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3526 Valid, 3540 Invalid, 315 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 313 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-11-23 21:29:31,142 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46451 states.