./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/systemc/token_ring.06.cil-1.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version e7bb482b 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_14072271-7222-41d6-96bc-9a6f4d4a5c7e/bin/utaipan-verify-FOvIYxoinp/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_14072271-7222-41d6-96bc-9a6f4d4a5c7e/bin/utaipan-verify-FOvIYxoinp/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_14072271-7222-41d6-96bc-9a6f4d4a5c7e/bin/utaipan-verify-FOvIYxoinp/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_14072271-7222-41d6-96bc-9a6f4d4a5c7e/bin/utaipan-verify-FOvIYxoinp/config/TaipanReach.xml -i ../../sv-benchmarks/c/systemc/token_ring.06.cil-1.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_14072271-7222-41d6-96bc-9a6f4d4a5c7e/bin/utaipan-verify-FOvIYxoinp/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_14072271-7222-41d6-96bc-9a6f4d4a5c7e/bin/utaipan-verify-FOvIYxoinp --witnessprinter.witness.filename witness.graphml --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 4ff0d99c6257365cafb7459615c8e1194d53bcc0d71dc100705abd4bb2d65c37 --- Real Ultimate output --- This is Ultimate 0.2.3-dev-e7bb482 [2023-11-06 20:29:59,596 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-06 20:29:59,665 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_14072271-7222-41d6-96bc-9a6f4d4a5c7e/bin/utaipan-verify-FOvIYxoinp/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-11-06 20:29:59,672 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-06 20:29:59,672 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-06 20:29:59,715 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-06 20:29:59,716 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-06 20:29:59,716 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-06 20:29:59,717 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-06 20:29:59,718 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-06 20:29:59,718 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-06 20:29:59,719 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-06 20:29:59,720 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-06 20:29:59,720 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-06 20:29:59,721 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-06 20:29:59,721 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-06 20:29:59,722 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-06 20:29:59,722 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-06 20:29:59,723 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-06 20:29:59,723 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-06 20:29:59,727 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-06 20:29:59,728 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-06 20:29:59,730 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-06 20:29:59,730 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-11-06 20:29:59,736 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-06 20:29:59,737 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-06 20:29:59,737 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-06 20:29:59,739 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-06 20:29:59,739 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-11-06 20:29:59,740 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-06 20:29:59,741 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-11-06 20:29:59,741 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-06 20:29:59,742 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-11-06 20:29:59,742 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-06 20:29:59,742 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-06 20:29:59,743 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-06 20:29:59,743 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-06 20:29:59,743 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-06 20:29:59,757 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-06 20:29:59,758 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2023-11-06 20:29:59,758 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-06 20:29:59,758 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-06 20:29:59,759 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-11-06 20:29:59,759 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-06 20:29:59,760 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-06 20:29:59,760 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_14072271-7222-41d6-96bc-9a6f4d4a5c7e/bin/utaipan-verify-FOvIYxoinp/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_14072271-7222-41d6-96bc-9a6f4d4a5c7e/bin/utaipan-verify-FOvIYxoinp Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 4ff0d99c6257365cafb7459615c8e1194d53bcc0d71dc100705abd4bb2d65c37 [2023-11-06 20:30:00,030 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-06 20:30:00,060 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-06 20:30:00,063 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-06 20:30:00,065 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-06 20:30:00,065 INFO L274 PluginConnector]: CDTParser initialized [2023-11-06 20:30:00,069 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_14072271-7222-41d6-96bc-9a6f4d4a5c7e/bin/utaipan-verify-FOvIYxoinp/../../sv-benchmarks/c/systemc/token_ring.06.cil-1.c [2023-11-06 20:30:03,246 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-06 20:30:03,492 INFO L384 CDTParser]: Found 1 translation units. [2023-11-06 20:30:03,493 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_14072271-7222-41d6-96bc-9a6f4d4a5c7e/sv-benchmarks/c/systemc/token_ring.06.cil-1.c [2023-11-06 20:30:03,517 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_14072271-7222-41d6-96bc-9a6f4d4a5c7e/bin/utaipan-verify-FOvIYxoinp/data/089ebe9b4/3393534f68fa4895a9848b523d32c347/FLAG3656befb7 [2023-11-06 20:30:03,534 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_14072271-7222-41d6-96bc-9a6f4d4a5c7e/bin/utaipan-verify-FOvIYxoinp/data/089ebe9b4/3393534f68fa4895a9848b523d32c347 [2023-11-06 20:30:03,538 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-06 20:30:03,540 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-06 20:30:03,547 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-06 20:30:03,547 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-06 20:30:03,556 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-06 20:30:03,556 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.11 08:30:03" (1/1) ... [2023-11-06 20:30:03,558 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@42dec8bc and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:30:03, skipping insertion in model container [2023-11-06 20:30:03,558 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.11 08:30:03" (1/1) ... [2023-11-06 20:30:03,617 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-06 20:30:03,820 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_14072271-7222-41d6-96bc-9a6f4d4a5c7e/sv-benchmarks/c/systemc/token_ring.06.cil-1.c[671,684] [2023-11-06 20:30:03,939 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-06 20:30:03,965 INFO L202 MainTranslator]: Completed pre-run [2023-11-06 20:30:03,982 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_14072271-7222-41d6-96bc-9a6f4d4a5c7e/sv-benchmarks/c/systemc/token_ring.06.cil-1.c[671,684] [2023-11-06 20:30:04,036 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-06 20:30:04,057 INFO L206 MainTranslator]: Completed translation [2023-11-06 20:30:04,058 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:30:04 WrapperNode [2023-11-06 20:30:04,058 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-06 20:30:04,059 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-06 20:30:04,060 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-06 20:30:04,060 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-06 20:30:04,069 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:30:04" (1/1) ... [2023-11-06 20:30:04,083 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:30:04" (1/1) ... [2023-11-06 20:30:04,127 INFO L138 Inliner]: procedures = 40, calls = 50, calls flagged for inlining = 23, calls inlined = 23, statements flattened = 525 [2023-11-06 20:30:04,128 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-06 20:30:04,129 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-06 20:30:04,129 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-06 20:30:04,129 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-06 20:30:04,137 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:30:04" (1/1) ... [2023-11-06 20:30:04,137 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:30:04" (1/1) ... [2023-11-06 20:30:04,141 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:30:04" (1/1) ... [2023-11-06 20:30:04,141 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:30:04" (1/1) ... [2023-11-06 20:30:04,153 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:30:04" (1/1) ... [2023-11-06 20:30:04,164 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:30:04" (1/1) ... [2023-11-06 20:30:04,168 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:30:04" (1/1) ... [2023-11-06 20:30:04,171 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:30:04" (1/1) ... [2023-11-06 20:30:04,177 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-06 20:30:04,178 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-06 20:30:04,178 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-06 20:30:04,179 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-06 20:30:04,179 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:30:04" (1/1) ... [2023-11-06 20:30:04,188 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-06 20:30:04,228 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_14072271-7222-41d6-96bc-9a6f4d4a5c7e/bin/utaipan-verify-FOvIYxoinp/z3 [2023-11-06 20:30:04,245 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_14072271-7222-41d6-96bc-9a6f4d4a5c7e/bin/utaipan-verify-FOvIYxoinp/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-06 20:30:04,272 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_14072271-7222-41d6-96bc-9a6f4d4a5c7e/bin/utaipan-verify-FOvIYxoinp/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-06 20:30:04,295 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-06 20:30:04,295 INFO L130 BoogieDeclarations]: Found specification of procedure error [2023-11-06 20:30:04,295 INFO L138 BoogieDeclarations]: Found implementation of procedure error [2023-11-06 20:30:04,295 INFO L130 BoogieDeclarations]: Found specification of procedure fire_delta_events [2023-11-06 20:30:04,296 INFO L138 BoogieDeclarations]: Found implementation of procedure fire_delta_events [2023-11-06 20:30:04,296 INFO L130 BoogieDeclarations]: Found specification of procedure activate_threads [2023-11-06 20:30:04,296 INFO L138 BoogieDeclarations]: Found implementation of procedure activate_threads [2023-11-06 20:30:04,296 INFO L130 BoogieDeclarations]: Found specification of procedure immediate_notify [2023-11-06 20:30:04,296 INFO L138 BoogieDeclarations]: Found implementation of procedure immediate_notify [2023-11-06 20:30:04,296 INFO L130 BoogieDeclarations]: Found specification of procedure exists_runnable_thread [2023-11-06 20:30:04,296 INFO L138 BoogieDeclarations]: Found implementation of procedure exists_runnable_thread [2023-11-06 20:30:04,297 INFO L130 BoogieDeclarations]: Found specification of procedure reset_delta_events [2023-11-06 20:30:04,297 INFO L138 BoogieDeclarations]: Found implementation of procedure reset_delta_events [2023-11-06 20:30:04,297 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-06 20:30:04,297 INFO L130 BoogieDeclarations]: Found specification of procedure update_channels [2023-11-06 20:30:04,297 INFO L138 BoogieDeclarations]: Found implementation of procedure update_channels [2023-11-06 20:30:04,297 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-06 20:30:04,298 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-06 20:30:04,399 INFO L236 CfgBuilder]: Building ICFG [2023-11-06 20:30:04,401 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-06 20:30:05,112 INFO L277 CfgBuilder]: Performing block encoding [2023-11-06 20:30:05,468 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-06 20:30:05,468 INFO L302 CfgBuilder]: Removed 9 assume(true) statements. [2023-11-06 20:30:05,471 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.11 08:30:05 BoogieIcfgContainer [2023-11-06 20:30:05,472 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-06 20:30:05,476 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-06 20:30:05,476 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-06 20:30:05,480 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-06 20:30:05,481 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.11 08:30:03" (1/3) ... [2023-11-06 20:30:05,482 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2d7cf260 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.11 08:30:05, skipping insertion in model container [2023-11-06 20:30:05,482 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:30:04" (2/3) ... [2023-11-06 20:30:05,484 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2d7cf260 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.11 08:30:05, skipping insertion in model container [2023-11-06 20:30:05,485 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.11 08:30:05" (3/3) ... [2023-11-06 20:30:05,486 INFO L112 eAbstractionObserver]: Analyzing ICFG token_ring.06.cil-1.c [2023-11-06 20:30:05,508 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-06 20:30:05,508 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-11-06 20:30:05,570 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-06 20:30:05,577 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=LoopsAndPotentialCycles, 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;@3149859f, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-06 20:30:05,578 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-11-06 20:30:05,584 INFO L276 IsEmpty]: Start isEmpty. Operand has 135 states, 104 states have (on average 1.5096153846153846) internal successors, (157), 108 states have internal predecessors, (157), 22 states have call successors, (22), 7 states have call predecessors, (22), 7 states have return successors, (22), 21 states have call predecessors, (22), 22 states have call successors, (22) [2023-11-06 20:30:05,601 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2023-11-06 20:30:05,601 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 20:30:05,602 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] [2023-11-06 20:30:05,603 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-06 20:30:05,610 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 20:30:05,611 INFO L85 PathProgramCache]: Analyzing trace with hash 90528386, now seen corresponding path program 1 times [2023-11-06 20:30:05,621 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 20:30:05,622 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1461476392] [2023-11-06 20:30:05,622 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:30:05,623 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 20:30:05,864 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:30:06,288 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-06 20:30:06,289 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 20:30:06,289 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1461476392] [2023-11-06 20:30:06,290 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1461476392] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-06 20:30:06,290 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-06 20:30:06,291 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-11-06 20:30:06,293 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1935081532] [2023-11-06 20:30:06,294 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-06 20:30:06,300 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-06 20:30:06,300 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 20:30:06,350 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-06 20:30:06,351 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-06 20:30:06,353 INFO L87 Difference]: Start difference. First operand has 135 states, 104 states have (on average 1.5096153846153846) internal successors, (157), 108 states have internal predecessors, (157), 22 states have call successors, (22), 7 states have call predecessors, (22), 7 states have return successors, (22), 21 states have call predecessors, (22), 22 states have call successors, (22) Second operand has 4 states, 4 states have (on average 9.5) internal successors, (38), 4 states have internal predecessors, (38), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2023-11-06 20:30:06,894 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 20:30:06,895 INFO L93 Difference]: Finished difference Result 382 states and 579 transitions. [2023-11-06 20:30:06,896 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-06 20:30:06,897 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 9.5) internal successors, (38), 4 states have internal predecessors, (38), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) Word has length 49 [2023-11-06 20:30:06,898 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 20:30:06,913 INFO L225 Difference]: With dead ends: 382 [2023-11-06 20:30:06,913 INFO L226 Difference]: Without dead ends: 248 [2023-11-06 20:30:06,918 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 [2023-11-06 20:30:06,922 INFO L413 NwaCegarLoop]: 295 mSDtfsCounter, 336 mSDsluCounter, 219 mSDsCounter, 0 mSdLazyCounter, 212 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 336 SdHoareTripleChecker+Valid, 514 SdHoareTripleChecker+Invalid, 223 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 212 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-11-06 20:30:06,923 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [336 Valid, 514 Invalid, 223 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 212 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-11-06 20:30:06,941 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 248 states. [2023-11-06 20:30:06,995 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 248 to 247. [2023-11-06 20:30:06,997 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 247 states, 196 states have (on average 1.4489795918367347) internal successors, (284), 199 states have internal predecessors, (284), 38 states have call successors, (38), 13 states have call predecessors, (38), 12 states have return successors, (36), 35 states have call predecessors, (36), 36 states have call successors, (36) [2023-11-06 20:30:07,001 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 247 states to 247 states and 358 transitions. [2023-11-06 20:30:07,003 INFO L78 Accepts]: Start accepts. Automaton has 247 states and 358 transitions. Word has length 49 [2023-11-06 20:30:07,003 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 20:30:07,003 INFO L495 AbstractCegarLoop]: Abstraction has 247 states and 358 transitions. [2023-11-06 20:30:07,004 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 9.5) internal successors, (38), 4 states have internal predecessors, (38), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2023-11-06 20:30:07,004 INFO L276 IsEmpty]: Start isEmpty. Operand 247 states and 358 transitions. [2023-11-06 20:30:07,010 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2023-11-06 20:30:07,010 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 20:30:07,011 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 20:30:07,011 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-06 20:30:07,011 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-06 20:30:07,012 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 20:30:07,012 INFO L85 PathProgramCache]: Analyzing trace with hash 2050691104, now seen corresponding path program 1 times [2023-11-06 20:30:07,012 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 20:30:07,013 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1768356553] [2023-11-06 20:30:07,013 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:30:07,013 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 20:30:07,065 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:30:07,382 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2023-11-06 20:30:07,383 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 20:30:07,383 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1768356553] [2023-11-06 20:30:07,383 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1768356553] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-06 20:30:07,384 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2033972552] [2023-11-06 20:30:07,384 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:30:07,384 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 20:30:07,384 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_14072271-7222-41d6-96bc-9a6f4d4a5c7e/bin/utaipan-verify-FOvIYxoinp/z3 [2023-11-06 20:30:07,388 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_14072271-7222-41d6-96bc-9a6f4d4a5c7e/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-06 20:30:07,397 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_14072271-7222-41d6-96bc-9a6f4d4a5c7e/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-06 20:30:07,611 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:30:07,616 INFO L262 TraceCheckSpWp]: Trace formula consists of 582 conjuncts, 2 conjunts are in the unsatisfiable core [2023-11-06 20:30:07,627 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-06 20:30:07,704 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2023-11-06 20:30:07,704 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-06 20:30:07,705 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2033972552] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-06 20:30:07,705 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-06 20:30:07,705 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2023-11-06 20:30:07,706 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1055602957] [2023-11-06 20:30:07,707 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-06 20:30:07,708 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-06 20:30:07,708 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 20:30:07,709 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-06 20:30:07,709 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-06 20:30:07,710 INFO L87 Difference]: Start difference. First operand 247 states and 358 transitions. Second operand has 3 states, 3 states have (on average 20.333333333333332) internal successors, (61), 2 states have internal predecessors, (61), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-11-06 20:30:07,850 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 20:30:07,851 INFO L93 Difference]: Finished difference Result 724 states and 1065 transitions. [2023-11-06 20:30:07,851 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-06 20:30:07,852 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 20.333333333333332) internal successors, (61), 2 states have internal predecessors, (61), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 95 [2023-11-06 20:30:07,852 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 20:30:07,859 INFO L225 Difference]: With dead ends: 724 [2023-11-06 20:30:07,859 INFO L226 Difference]: Without dead ends: 482 [2023-11-06 20:30:07,861 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 99 GetRequests, 95 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-06 20:30:07,863 INFO L413 NwaCegarLoop]: 206 mSDtfsCounter, 166 mSDsluCounter, 150 mSDsCounter, 0 mSdLazyCounter, 70 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 166 SdHoareTripleChecker+Valid, 356 SdHoareTripleChecker+Invalid, 72 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 70 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-06 20:30:07,864 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [166 Valid, 356 Invalid, 72 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 70 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-06 20:30:07,865 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 482 states. [2023-11-06 20:30:07,909 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 482 to 476. [2023-11-06 20:30:07,911 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 476 states, 383 states have (on average 1.443864229765013) internal successors, (553), 387 states have internal predecessors, (553), 68 states have call successors, (68), 25 states have call predecessors, (68), 24 states have return successors, (66), 64 states have call predecessors, (66), 66 states have call successors, (66) [2023-11-06 20:30:07,915 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 476 states to 476 states and 687 transitions. [2023-11-06 20:30:07,916 INFO L78 Accepts]: Start accepts. Automaton has 476 states and 687 transitions. Word has length 95 [2023-11-06 20:30:07,916 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 20:30:07,917 INFO L495 AbstractCegarLoop]: Abstraction has 476 states and 687 transitions. [2023-11-06 20:30:07,917 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 20.333333333333332) internal successors, (61), 2 states have internal predecessors, (61), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-11-06 20:30:07,917 INFO L276 IsEmpty]: Start isEmpty. Operand 476 states and 687 transitions. [2023-11-06 20:30:07,921 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2023-11-06 20:30:07,921 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 20:30:07,922 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 20:30:07,934 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_14072271-7222-41d6-96bc-9a6f4d4a5c7e/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-11-06 20:30:08,128 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_14072271-7222-41d6-96bc-9a6f4d4a5c7e/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 20:30:08,129 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-06 20:30:08,129 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 20:30:08,129 INFO L85 PathProgramCache]: Analyzing trace with hash -1039898368, now seen corresponding path program 1 times [2023-11-06 20:30:08,130 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 20:30:08,130 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [900126119] [2023-11-06 20:30:08,130 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:30:08,130 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 20:30:08,158 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:30:08,315 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2023-11-06 20:30:08,315 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 20:30:08,315 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [900126119] [2023-11-06 20:30:08,316 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [900126119] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-06 20:30:08,316 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1897925148] [2023-11-06 20:30:08,316 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:30:08,316 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 20:30:08,317 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_14072271-7222-41d6-96bc-9a6f4d4a5c7e/bin/utaipan-verify-FOvIYxoinp/z3 [2023-11-06 20:30:08,318 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_14072271-7222-41d6-96bc-9a6f4d4a5c7e/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-06 20:30:08,324 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_14072271-7222-41d6-96bc-9a6f4d4a5c7e/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-06 20:30:08,517 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:30:08,520 INFO L262 TraceCheckSpWp]: Trace formula consists of 576 conjuncts, 2 conjunts are in the unsatisfiable core [2023-11-06 20:30:08,527 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-06 20:30:08,580 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2023-11-06 20:30:08,580 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-06 20:30:08,580 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1897925148] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-06 20:30:08,581 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-06 20:30:08,581 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2023-11-06 20:30:08,581 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [973014162] [2023-11-06 20:30:08,581 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-06 20:30:08,582 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-06 20:30:08,583 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 20:30:08,585 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-06 20:30:08,585 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-06 20:30:08,586 INFO L87 Difference]: Start difference. First operand 476 states and 687 transitions. Second operand has 3 states, 3 states have (on average 19.333333333333332) internal successors, (58), 2 states have internal predecessors, (58), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-11-06 20:30:08,760 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 20:30:08,761 INFO L93 Difference]: Finished difference Result 1405 states and 2058 transitions. [2023-11-06 20:30:08,761 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-06 20:30:08,761 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 19.333333333333332) internal successors, (58), 2 states have internal predecessors, (58), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 95 [2023-11-06 20:30:08,762 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 20:30:08,771 INFO L225 Difference]: With dead ends: 1405 [2023-11-06 20:30:08,771 INFO L226 Difference]: Without dead ends: 934 [2023-11-06 20:30:08,774 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 99 GetRequests, 95 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-06 20:30:08,777 INFO L413 NwaCegarLoop]: 204 mSDtfsCounter, 169 mSDsluCounter, 150 mSDsCounter, 0 mSdLazyCounter, 70 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 169 SdHoareTripleChecker+Valid, 354 SdHoareTripleChecker+Invalid, 72 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 70 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-06 20:30:08,778 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [169 Valid, 354 Invalid, 72 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 70 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-06 20:30:08,782 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 934 states. [2023-11-06 20:30:08,862 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 934 to 926. [2023-11-06 20:30:08,865 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 926 states, 751 states have (on average 1.4367509986684421) internal successors, (1079), 757 states have internal predecessors, (1079), 126 states have call successors, (126), 49 states have call predecessors, (126), 48 states have return successors, (124), 120 states have call predecessors, (124), 124 states have call successors, (124) [2023-11-06 20:30:08,873 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 926 states to 926 states and 1329 transitions. [2023-11-06 20:30:08,874 INFO L78 Accepts]: Start accepts. Automaton has 926 states and 1329 transitions. Word has length 95 [2023-11-06 20:30:08,875 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 20:30:08,875 INFO L495 AbstractCegarLoop]: Abstraction has 926 states and 1329 transitions. [2023-11-06 20:30:08,876 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 19.333333333333332) internal successors, (58), 2 states have internal predecessors, (58), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-11-06 20:30:08,876 INFO L276 IsEmpty]: Start isEmpty. Operand 926 states and 1329 transitions. [2023-11-06 20:30:08,882 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2023-11-06 20:30:08,882 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 20:30:08,882 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 20:30:08,893 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_14072271-7222-41d6-96bc-9a6f4d4a5c7e/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2023-11-06 20:30:09,088 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_14072271-7222-41d6-96bc-9a6f4d4a5c7e/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 20:30:09,088 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-06 20:30:09,089 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 20:30:09,089 INFO L85 PathProgramCache]: Analyzing trace with hash -1576934368, now seen corresponding path program 1 times [2023-11-06 20:30:09,089 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 20:30:09,089 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1208676992] [2023-11-06 20:30:09,089 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:30:09,090 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 20:30:09,122 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:30:09,257 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2023-11-06 20:30:09,258 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 20:30:09,258 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1208676992] [2023-11-06 20:30:09,259 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1208676992] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-06 20:30:09,259 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [192404342] [2023-11-06 20:30:09,259 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:30:09,259 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 20:30:09,260 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_14072271-7222-41d6-96bc-9a6f4d4a5c7e/bin/utaipan-verify-FOvIYxoinp/z3 [2023-11-06 20:30:09,261 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_14072271-7222-41d6-96bc-9a6f4d4a5c7e/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-06 20:30:09,294 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_14072271-7222-41d6-96bc-9a6f4d4a5c7e/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-06 20:30:09,455 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:30:09,458 INFO L262 TraceCheckSpWp]: Trace formula consists of 570 conjuncts, 2 conjunts are in the unsatisfiable core [2023-11-06 20:30:09,474 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-06 20:30:09,539 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 17 proven. 0 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2023-11-06 20:30:09,540 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-06 20:30:09,540 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [192404342] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-06 20:30:09,540 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-06 20:30:09,540 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [4] total 4 [2023-11-06 20:30:09,541 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2085087639] [2023-11-06 20:30:09,541 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-06 20:30:09,543 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-06 20:30:09,543 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 20:30:09,544 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-06 20:30:09,544 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-06 20:30:09,545 INFO L87 Difference]: Start difference. First operand 926 states and 1329 transitions. Second operand has 3 states, 3 states have (on average 22.333333333333332) internal successors, (67), 2 states have internal predecessors, (67), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-11-06 20:30:09,783 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 20:30:09,783 INFO L93 Difference]: Finished difference Result 2743 states and 3994 transitions. [2023-11-06 20:30:09,784 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-06 20:30:09,784 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 22.333333333333332) internal successors, (67), 2 states have internal predecessors, (67), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 95 [2023-11-06 20:30:09,785 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 20:30:09,801 INFO L225 Difference]: With dead ends: 2743 [2023-11-06 20:30:09,801 INFO L226 Difference]: Without dead ends: 1822 [2023-11-06 20:30:09,805 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 96 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-06 20:30:09,808 INFO L413 NwaCegarLoop]: 159 mSDtfsCounter, 160 mSDsluCounter, 150 mSDsCounter, 0 mSdLazyCounter, 66 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 160 SdHoareTripleChecker+Valid, 309 SdHoareTripleChecker+Invalid, 68 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 66 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-06 20:30:09,810 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [160 Valid, 309 Invalid, 68 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 66 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-06 20:30:09,814 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1822 states. [2023-11-06 20:30:09,951 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1822 to 1810. [2023-11-06 20:30:09,955 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1810 states, 1475 states have (on average 1.4284745762711863) internal successors, (2107), 1485 states have internal predecessors, (2107), 238 states have call successors, (238), 97 states have call predecessors, (238), 96 states have return successors, (236), 228 states have call predecessors, (236), 236 states have call successors, (236) [2023-11-06 20:30:09,970 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1810 states to 1810 states and 2581 transitions. [2023-11-06 20:30:09,971 INFO L78 Accepts]: Start accepts. Automaton has 1810 states and 2581 transitions. Word has length 95 [2023-11-06 20:30:09,972 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 20:30:09,972 INFO L495 AbstractCegarLoop]: Abstraction has 1810 states and 2581 transitions. [2023-11-06 20:30:09,972 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 22.333333333333332) internal successors, (67), 2 states have internal predecessors, (67), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-11-06 20:30:09,973 INFO L276 IsEmpty]: Start isEmpty. Operand 1810 states and 2581 transitions. [2023-11-06 20:30:09,985 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2023-11-06 20:30:09,985 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 20:30:09,985 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 20:30:09,997 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_14072271-7222-41d6-96bc-9a6f4d4a5c7e/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-11-06 20:30:10,191 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_14072271-7222-41d6-96bc-9a6f4d4a5c7e/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 20:30:10,192 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-06 20:30:10,192 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 20:30:10,192 INFO L85 PathProgramCache]: Analyzing trace with hash 1853318400, now seen corresponding path program 1 times [2023-11-06 20:30:10,193 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 20:30:10,193 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [864542372] [2023-11-06 20:30:10,193 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:30:10,193 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 20:30:10,222 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:30:10,318 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2023-11-06 20:30:10,318 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 20:30:10,319 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [864542372] [2023-11-06 20:30:10,319 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [864542372] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-06 20:30:10,319 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-06 20:30:10,319 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-06 20:30:10,319 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [166772037] [2023-11-06 20:30:10,320 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-06 20:30:10,321 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-06 20:30:10,325 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 20:30:10,325 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-06 20:30:10,325 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-06 20:30:10,326 INFO L87 Difference]: Start difference. First operand 1810 states and 2581 transitions. Second operand has 3 states, 3 states have (on average 18.333333333333332) internal successors, (55), 3 states have internal predecessors, (55), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2023-11-06 20:30:10,559 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 20:30:10,559 INFO L93 Difference]: Finished difference Result 3238 states and 4680 transitions. [2023-11-06 20:30:10,561 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-06 20:30:10,561 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 18.333333333333332) internal successors, (55), 3 states have internal predecessors, (55), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) Word has length 95 [2023-11-06 20:30:10,562 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 20:30:10,586 INFO L225 Difference]: With dead ends: 3238 [2023-11-06 20:30:10,587 INFO L226 Difference]: Without dead ends: 2306 [2023-11-06 20:30:10,591 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-06 20:30:10,592 INFO L413 NwaCegarLoop]: 244 mSDtfsCounter, 80 mSDsluCounter, 166 mSDsCounter, 0 mSdLazyCounter, 80 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 80 SdHoareTripleChecker+Valid, 410 SdHoareTripleChecker+Invalid, 80 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 80 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-06 20:30:10,592 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [80 Valid, 410 Invalid, 80 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 80 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-06 20:30:10,596 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2306 states. [2023-11-06 20:30:10,756 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2306 to 2150. [2023-11-06 20:30:10,761 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2150 states, 1799 states have (on average 1.4558087826570316) internal successors, (2619), 1809 states have internal predecessors, (2619), 246 states have call successors, (246), 105 states have call predecessors, (246), 104 states have return successors, (244), 236 states have call predecessors, (244), 244 states have call successors, (244) [2023-11-06 20:30:10,780 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2150 states to 2150 states and 3109 transitions. [2023-11-06 20:30:10,780 INFO L78 Accepts]: Start accepts. Automaton has 2150 states and 3109 transitions. Word has length 95 [2023-11-06 20:30:10,782 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 20:30:10,782 INFO L495 AbstractCegarLoop]: Abstraction has 2150 states and 3109 transitions. [2023-11-06 20:30:10,782 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 18.333333333333332) internal successors, (55), 3 states have internal predecessors, (55), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2023-11-06 20:30:10,782 INFO L276 IsEmpty]: Start isEmpty. Operand 2150 states and 3109 transitions. [2023-11-06 20:30:10,792 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 129 [2023-11-06 20:30:10,792 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 20:30:10,792 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 20:30:10,793 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2023-11-06 20:30:10,793 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-06 20:30:10,794 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 20:30:10,794 INFO L85 PathProgramCache]: Analyzing trace with hash 1507396186, now seen corresponding path program 1 times [2023-11-06 20:30:10,794 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 20:30:10,794 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [798113149] [2023-11-06 20:30:10,795 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:30:10,795 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 20:30:10,831 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:30:10,897 INFO L134 CoverageAnalysis]: Checked inductivity of 79 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 72 trivial. 0 not checked. [2023-11-06 20:30:10,897 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 20:30:10,898 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [798113149] [2023-11-06 20:30:10,898 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [798113149] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-06 20:30:10,898 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-06 20:30:10,898 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-06 20:30:10,899 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [782077657] [2023-11-06 20:30:10,899 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-06 20:30:10,900 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-06 20:30:10,900 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 20:30:10,900 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-06 20:30:10,901 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-06 20:30:10,901 INFO L87 Difference]: Start difference. First operand 2150 states and 3109 transitions. Second operand has 3 states, 3 states have (on average 21.0) internal successors, (63), 3 states have internal predecessors, (63), 3 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2023-11-06 20:30:11,251 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 20:30:11,251 INFO L93 Difference]: Finished difference Result 6367 states and 9302 transitions. [2023-11-06 20:30:11,252 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-06 20:30:11,252 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 21.0) internal successors, (63), 3 states have internal predecessors, (63), 3 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 128 [2023-11-06 20:30:11,254 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 20:30:11,285 INFO L225 Difference]: With dead ends: 6367 [2023-11-06 20:30:11,286 INFO L226 Difference]: Without dead ends: 4222 [2023-11-06 20:30:11,294 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-06 20:30:11,295 INFO L413 NwaCegarLoop]: 161 mSDtfsCounter, 157 mSDsluCounter, 150 mSDsCounter, 0 mSdLazyCounter, 64 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 157 SdHoareTripleChecker+Valid, 311 SdHoareTripleChecker+Invalid, 66 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 64 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-06 20:30:11,298 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [157 Valid, 311 Invalid, 66 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 64 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-06 20:30:11,304 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4222 states. [2023-11-06 20:30:11,554 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4222 to 4194. [2023-11-06 20:30:11,563 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4194 states, 3515 states have (on average 1.4438122332859176) internal successors, (5075), 3533 states have internal predecessors, (5075), 470 states have call successors, (470), 209 states have call predecessors, (470), 208 states have return successors, (468), 452 states have call predecessors, (468), 468 states have call successors, (468) [2023-11-06 20:30:11,597 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4194 states to 4194 states and 6013 transitions. [2023-11-06 20:30:11,598 INFO L78 Accepts]: Start accepts. Automaton has 4194 states and 6013 transitions. Word has length 128 [2023-11-06 20:30:11,598 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 20:30:11,598 INFO L495 AbstractCegarLoop]: Abstraction has 4194 states and 6013 transitions. [2023-11-06 20:30:11,599 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 21.0) internal successors, (63), 3 states have internal predecessors, (63), 3 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2023-11-06 20:30:11,599 INFO L276 IsEmpty]: Start isEmpty. Operand 4194 states and 6013 transitions. [2023-11-06 20:30:11,614 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 129 [2023-11-06 20:30:11,614 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 20:30:11,632 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 20:30:11,632 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2023-11-06 20:30:11,633 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-06 20:30:11,633 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 20:30:11,633 INFO L85 PathProgramCache]: Analyzing trace with hash -1228639553, now seen corresponding path program 1 times [2023-11-06 20:30:11,634 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 20:30:11,634 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1022352041] [2023-11-06 20:30:11,634 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:30:11,634 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 20:30:11,680 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:30:11,759 INFO L134 CoverageAnalysis]: Checked inductivity of 79 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 72 trivial. 0 not checked. [2023-11-06 20:30:11,759 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 20:30:11,759 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1022352041] [2023-11-06 20:30:11,760 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1022352041] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-06 20:30:11,760 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-06 20:30:11,760 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-06 20:30:11,760 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1775407247] [2023-11-06 20:30:11,761 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-06 20:30:11,761 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-06 20:30:11,761 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 20:30:11,763 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-06 20:30:11,763 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-06 20:30:11,763 INFO L87 Difference]: Start difference. First operand 4194 states and 6013 transitions. Second operand has 3 states, 3 states have (on average 21.0) internal successors, (63), 3 states have internal predecessors, (63), 3 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2023-11-06 20:30:12,288 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 20:30:12,289 INFO L93 Difference]: Finished difference Result 12427 states and 17990 transitions. [2023-11-06 20:30:12,289 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-06 20:30:12,290 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 21.0) internal successors, (63), 3 states have internal predecessors, (63), 3 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 128 [2023-11-06 20:30:12,291 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 20:30:12,356 INFO L225 Difference]: With dead ends: 12427 [2023-11-06 20:30:12,356 INFO L226 Difference]: Without dead ends: 8238 [2023-11-06 20:30:12,372 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-06 20:30:12,373 INFO L413 NwaCegarLoop]: 161 mSDtfsCounter, 159 mSDsluCounter, 150 mSDsCounter, 0 mSdLazyCounter, 64 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 159 SdHoareTripleChecker+Valid, 311 SdHoareTripleChecker+Invalid, 66 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 64 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-06 20:30:12,373 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [159 Valid, 311 Invalid, 66 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 64 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-06 20:30:12,385 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8238 states. [2023-11-06 20:30:12,881 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8238 to 8186. [2023-11-06 20:30:12,899 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 8186 states, 6867 states have (on average 1.4310470365516237) internal successors, (9827), 6901 states have internal predecessors, (9827), 902 states have call successors, (902), 417 states have call predecessors, (902), 416 states have return successors, (900), 868 states have call predecessors, (900), 900 states have call successors, (900) [2023-11-06 20:30:12,963 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8186 states to 8186 states and 11629 transitions. [2023-11-06 20:30:12,964 INFO L78 Accepts]: Start accepts. Automaton has 8186 states and 11629 transitions. Word has length 128 [2023-11-06 20:30:12,965 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 20:30:12,965 INFO L495 AbstractCegarLoop]: Abstraction has 8186 states and 11629 transitions. [2023-11-06 20:30:12,965 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 21.0) internal successors, (63), 3 states have internal predecessors, (63), 3 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2023-11-06 20:30:12,965 INFO L276 IsEmpty]: Start isEmpty. Operand 8186 states and 11629 transitions. [2023-11-06 20:30:12,995 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 129 [2023-11-06 20:30:12,995 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 20:30:12,996 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 20:30:12,996 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2023-11-06 20:30:12,996 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-06 20:30:12,997 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 20:30:12,997 INFO L85 PathProgramCache]: Analyzing trace with hash 1406277919, now seen corresponding path program 1 times [2023-11-06 20:30:12,997 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 20:30:12,997 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1762210694] [2023-11-06 20:30:12,998 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:30:12,998 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 20:30:13,078 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:30:13,165 INFO L134 CoverageAnalysis]: Checked inductivity of 79 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 72 trivial. 0 not checked. [2023-11-06 20:30:13,165 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 20:30:13,166 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1762210694] [2023-11-06 20:30:13,166 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1762210694] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-06 20:30:13,166 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-06 20:30:13,166 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-06 20:30:13,166 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1194560724] [2023-11-06 20:30:13,167 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-06 20:30:13,167 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-06 20:30:13,167 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 20:30:13,168 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-06 20:30:13,168 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-06 20:30:13,169 INFO L87 Difference]: Start difference. First operand 8186 states and 11629 transitions. Second operand has 3 states, 3 states have (on average 21.0) internal successors, (63), 3 states have internal predecessors, (63), 3 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2023-11-06 20:30:14,134 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 20:30:14,134 INFO L93 Difference]: Finished difference Result 24259 states and 34774 transitions. [2023-11-06 20:30:14,135 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-06 20:30:14,135 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 21.0) internal successors, (63), 3 states have internal predecessors, (63), 3 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 128 [2023-11-06 20:30:14,135 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 20:30:14,256 INFO L225 Difference]: With dead ends: 24259 [2023-11-06 20:30:14,256 INFO L226 Difference]: Without dead ends: 16078 [2023-11-06 20:30:14,290 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-06 20:30:14,293 INFO L413 NwaCegarLoop]: 175 mSDtfsCounter, 162 mSDsluCounter, 150 mSDsCounter, 0 mSdLazyCounter, 65 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 162 SdHoareTripleChecker+Valid, 325 SdHoareTripleChecker+Invalid, 67 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 65 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-06 20:30:14,294 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [162 Valid, 325 Invalid, 67 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 65 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-06 20:30:14,318 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16078 states. [2023-11-06 20:30:15,246 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16078 to 15978. [2023-11-06 20:30:15,273 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15978 states, 13411 states have (on average 1.4175676683319662) internal successors, (19011), 13477 states have internal predecessors, (19011), 1734 states have call successors, (1734), 833 states have call predecessors, (1734), 832 states have return successors, (1732), 1668 states have call predecessors, (1732), 1732 states have call successors, (1732) [2023-11-06 20:30:15,412 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15978 states to 15978 states and 22477 transitions. [2023-11-06 20:30:15,415 INFO L78 Accepts]: Start accepts. Automaton has 15978 states and 22477 transitions. Word has length 128 [2023-11-06 20:30:15,415 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 20:30:15,415 INFO L495 AbstractCegarLoop]: Abstraction has 15978 states and 22477 transitions. [2023-11-06 20:30:15,416 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 21.0) internal successors, (63), 3 states have internal predecessors, (63), 3 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2023-11-06 20:30:15,416 INFO L276 IsEmpty]: Start isEmpty. Operand 15978 states and 22477 transitions. [2023-11-06 20:30:15,486 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 150 [2023-11-06 20:30:15,486 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 20:30:15,487 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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] [2023-11-06 20:30:15,487 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2023-11-06 20:30:15,487 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-06 20:30:15,487 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 20:30:15,488 INFO L85 PathProgramCache]: Analyzing trace with hash 418071210, now seen corresponding path program 1 times [2023-11-06 20:30:15,488 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 20:30:15,488 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1003441844] [2023-11-06 20:30:15,488 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:30:15,489 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 20:30:15,520 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:30:15,911 INFO L134 CoverageAnalysis]: Checked inductivity of 103 backedges. 10 proven. 45 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2023-11-06 20:30:15,912 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 20:30:15,912 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1003441844] [2023-11-06 20:30:15,912 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1003441844] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-06 20:30:15,912 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1052970150] [2023-11-06 20:30:15,912 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:30:15,913 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 20:30:15,913 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_14072271-7222-41d6-96bc-9a6f4d4a5c7e/bin/utaipan-verify-FOvIYxoinp/z3 [2023-11-06 20:30:15,914 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_14072271-7222-41d6-96bc-9a6f4d4a5c7e/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-06 20:30:15,936 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_14072271-7222-41d6-96bc-9a6f4d4a5c7e/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-11-06 20:30:16,119 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:30:16,124 INFO L262 TraceCheckSpWp]: Trace formula consists of 766 conjuncts, 3 conjunts are in the unsatisfiable core [2023-11-06 20:30:16,129 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-06 20:30:16,193 INFO L134 CoverageAnalysis]: Checked inductivity of 103 backedges. 98 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2023-11-06 20:30:16,193 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-06 20:30:16,193 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1052970150] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-06 20:30:16,193 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-06 20:30:16,194 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2023-11-06 20:30:16,194 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1765780052] [2023-11-06 20:30:16,194 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-06 20:30:16,195 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-06 20:30:16,195 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 20:30:16,195 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-06 20:30:16,196 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-11-06 20:30:16,196 INFO L87 Difference]: Start difference. First operand 15978 states and 22477 transitions. Second operand has 3 states, 3 states have (on average 41.0) internal successors, (123), 3 states have internal predecessors, (123), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2023-11-06 20:30:17,380 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 20:30:17,380 INFO L93 Difference]: Finished difference Result 24226 states and 34643 transitions. [2023-11-06 20:30:17,381 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-06 20:30:17,381 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 41.0) internal successors, (123), 3 states have internal predecessors, (123), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) Word has length 149 [2023-11-06 20:30:17,381 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 20:30:17,444 INFO L225 Difference]: With dead ends: 24226 [2023-11-06 20:30:17,444 INFO L226 Difference]: Without dead ends: 16046 [2023-11-06 20:30:17,469 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 156 GetRequests, 151 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-11-06 20:30:17,470 INFO L413 NwaCegarLoop]: 294 mSDtfsCounter, 147 mSDsluCounter, 153 mSDsCounter, 0 mSdLazyCounter, 88 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 147 SdHoareTripleChecker+Valid, 447 SdHoareTripleChecker+Invalid, 90 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 88 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-06 20:30:17,470 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [147 Valid, 447 Invalid, 90 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 88 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-06 20:30:17,490 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16046 states. [2023-11-06 20:30:18,331 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16046 to 15914. [2023-11-06 20:30:18,361 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15914 states, 13347 states have (on average 1.4003896006593242) internal successors, (18691), 13413 states have internal predecessors, (18691), 1734 states have call successors, (1734), 833 states have call predecessors, (1734), 832 states have return successors, (1732), 1668 states have call predecessors, (1732), 1732 states have call successors, (1732) [2023-11-06 20:30:18,443 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15914 states to 15914 states and 22157 transitions. [2023-11-06 20:30:18,445 INFO L78 Accepts]: Start accepts. Automaton has 15914 states and 22157 transitions. Word has length 149 [2023-11-06 20:30:18,446 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 20:30:18,446 INFO L495 AbstractCegarLoop]: Abstraction has 15914 states and 22157 transitions. [2023-11-06 20:30:18,447 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 41.0) internal successors, (123), 3 states have internal predecessors, (123), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2023-11-06 20:30:18,447 INFO L276 IsEmpty]: Start isEmpty. Operand 15914 states and 22157 transitions. [2023-11-06 20:30:18,514 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 150 [2023-11-06 20:30:18,514 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 20:30:18,515 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 20:30:18,526 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_14072271-7222-41d6-96bc-9a6f4d4a5c7e/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-11-06 20:30:18,721 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_14072271-7222-41d6-96bc-9a6f4d4a5c7e/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 20:30:18,722 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-06 20:30:18,722 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 20:30:18,722 INFO L85 PathProgramCache]: Analyzing trace with hash 153815050, now seen corresponding path program 1 times [2023-11-06 20:30:18,722 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 20:30:18,722 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [305856197] [2023-11-06 20:30:18,723 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:30:18,723 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 20:30:18,751 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:30:19,231 INFO L134 CoverageAnalysis]: Checked inductivity of 101 backedges. 10 proven. 43 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2023-11-06 20:30:19,231 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 20:30:19,232 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [305856197] [2023-11-06 20:30:19,232 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [305856197] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-06 20:30:19,232 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1267256853] [2023-11-06 20:30:19,232 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:30:19,232 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 20:30:19,233 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_14072271-7222-41d6-96bc-9a6f4d4a5c7e/bin/utaipan-verify-FOvIYxoinp/z3 [2023-11-06 20:30:19,234 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_14072271-7222-41d6-96bc-9a6f4d4a5c7e/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-06 20:30:19,256 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_14072271-7222-41d6-96bc-9a6f4d4a5c7e/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-11-06 20:30:19,446 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:30:19,450 INFO L262 TraceCheckSpWp]: Trace formula consists of 772 conjuncts, 3 conjunts are in the unsatisfiable core [2023-11-06 20:30:19,454 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-06 20:30:19,491 INFO L134 CoverageAnalysis]: Checked inductivity of 101 backedges. 71 proven. 0 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2023-11-06 20:30:19,492 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-06 20:30:19,492 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1267256853] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-06 20:30:19,492 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-06 20:30:19,492 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2023-11-06 20:30:19,493 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1801947846] [2023-11-06 20:30:19,493 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-06 20:30:19,493 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-06 20:30:19,494 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 20:30:19,494 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-06 20:30:19,494 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-11-06 20:30:19,495 INFO L87 Difference]: Start difference. First operand 15914 states and 22157 transitions. Second operand has 3 states, 3 states have (on average 34.0) internal successors, (102), 3 states have internal predecessors, (102), 3 states have call successors, (11), 3 states have call predecessors, (11), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) [2023-11-06 20:30:20,485 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 20:30:20,486 INFO L93 Difference]: Finished difference Result 24130 states and 34163 transitions. [2023-11-06 20:30:20,486 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-06 20:30:20,487 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 34.0) internal successors, (102), 3 states have internal predecessors, (102), 3 states have call successors, (11), 3 states have call predecessors, (11), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) Word has length 149 [2023-11-06 20:30:20,487 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 20:30:20,566 INFO L225 Difference]: With dead ends: 24130 [2023-11-06 20:30:20,567 INFO L226 Difference]: Without dead ends: 15982 [2023-11-06 20:30:20,603 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 156 GetRequests, 151 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-11-06 20:30:20,604 INFO L413 NwaCegarLoop]: 289 mSDtfsCounter, 163 mSDsluCounter, 152 mSDsCounter, 0 mSdLazyCounter, 88 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 163 SdHoareTripleChecker+Valid, 441 SdHoareTripleChecker+Invalid, 90 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 88 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-06 20:30:20,605 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [163 Valid, 441 Invalid, 90 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 88 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-06 20:30:20,626 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15982 states. [2023-11-06 20:30:21,834 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15982 to 15850. [2023-11-06 20:30:21,853 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15850 states, 13283 states have (on average 1.3830459986448844) internal successors, (18371), 13349 states have internal predecessors, (18371), 1734 states have call successors, (1734), 833 states have call predecessors, (1734), 832 states have return successors, (1732), 1668 states have call predecessors, (1732), 1732 states have call successors, (1732) [2023-11-06 20:30:21,909 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15850 states to 15850 states and 21837 transitions. [2023-11-06 20:30:21,911 INFO L78 Accepts]: Start accepts. Automaton has 15850 states and 21837 transitions. Word has length 149 [2023-11-06 20:30:21,912 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 20:30:21,912 INFO L495 AbstractCegarLoop]: Abstraction has 15850 states and 21837 transitions. [2023-11-06 20:30:21,912 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 34.0) internal successors, (102), 3 states have internal predecessors, (102), 3 states have call successors, (11), 3 states have call predecessors, (11), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) [2023-11-06 20:30:21,912 INFO L276 IsEmpty]: Start isEmpty. Operand 15850 states and 21837 transitions. [2023-11-06 20:30:21,956 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 150 [2023-11-06 20:30:21,956 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 20:30:21,957 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 20:30:21,969 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_14072271-7222-41d6-96bc-9a6f4d4a5c7e/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-11-06 20:30:22,163 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_14072271-7222-41d6-96bc-9a6f4d4a5c7e/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2023-11-06 20:30:22,164 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-06 20:30:22,164 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 20:30:22,164 INFO L85 PathProgramCache]: Analyzing trace with hash -971444919, now seen corresponding path program 1 times [2023-11-06 20:30:22,164 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 20:30:22,165 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [260184348] [2023-11-06 20:30:22,165 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:30:22,165 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 20:30:22,190 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:30:22,514 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 10 proven. 42 refuted. 0 times theorem prover too weak. 47 trivial. 0 not checked. [2023-11-06 20:30:22,514 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 20:30:22,514 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [260184348] [2023-11-06 20:30:22,514 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [260184348] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-06 20:30:22,515 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [902647642] [2023-11-06 20:30:22,515 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:30:22,515 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 20:30:22,515 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_14072271-7222-41d6-96bc-9a6f4d4a5c7e/bin/utaipan-verify-FOvIYxoinp/z3 [2023-11-06 20:30:22,516 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_14072271-7222-41d6-96bc-9a6f4d4a5c7e/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-06 20:30:22,536 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_14072271-7222-41d6-96bc-9a6f4d4a5c7e/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-11-06 20:30:22,722 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:30:22,726 INFO L262 TraceCheckSpWp]: Trace formula consists of 775 conjuncts, 2 conjunts are in the unsatisfiable core [2023-11-06 20:30:22,729 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-06 20:30:22,779 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 70 proven. 0 refuted. 0 times theorem prover too weak. 29 trivial. 0 not checked. [2023-11-06 20:30:22,780 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-06 20:30:22,780 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [902647642] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-06 20:30:22,780 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-06 20:30:22,780 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2023-11-06 20:30:22,783 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1977380675] [2023-11-06 20:30:22,783 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-06 20:30:22,784 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-06 20:30:22,784 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 20:30:22,784 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-06 20:30:22,785 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-11-06 20:30:22,785 INFO L87 Difference]: Start difference. First operand 15850 states and 21837 transitions. Second operand has 3 states, 3 states have (on average 34.0) internal successors, (102), 3 states have internal predecessors, (102), 3 states have call successors, (11), 3 states have call predecessors, (11), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) [2023-11-06 20:30:23,912 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 20:30:23,912 INFO L93 Difference]: Finished difference Result 27672 states and 37770 transitions. [2023-11-06 20:30:23,913 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-06 20:30:23,913 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 34.0) internal successors, (102), 3 states have internal predecessors, (102), 3 states have call successors, (11), 3 states have call predecessors, (11), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) Word has length 149 [2023-11-06 20:30:23,914 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 20:30:23,994 INFO L225 Difference]: With dead ends: 27672 [2023-11-06 20:30:23,995 INFO L226 Difference]: Without dead ends: 19620 [2023-11-06 20:30:24,020 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 156 GetRequests, 151 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-11-06 20:30:24,022 INFO L413 NwaCegarLoop]: 180 mSDtfsCounter, 160 mSDsluCounter, 39 mSDsCounter, 0 mSdLazyCounter, 41 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 160 SdHoareTripleChecker+Valid, 219 SdHoareTripleChecker+Invalid, 45 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 41 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-06 20:30:24,022 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [160 Valid, 219 Invalid, 45 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 41 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-06 20:30:24,043 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19620 states. [2023-11-06 20:30:24,955 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19620 to 19620. [2023-11-06 20:30:24,985 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19620 states, 16673 states have (on average 1.347387992562826) internal successors, (22465), 16739 states have internal predecessors, (22465), 1860 states have call successors, (1860), 1087 states have call predecessors, (1860), 1086 states have return successors, (1858), 1794 states have call predecessors, (1858), 1858 states have call successors, (1858) [2023-11-06 20:30:25,058 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19620 states to 19620 states and 26183 transitions. [2023-11-06 20:30:25,061 INFO L78 Accepts]: Start accepts. Automaton has 19620 states and 26183 transitions. Word has length 149 [2023-11-06 20:30:25,061 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 20:30:25,062 INFO L495 AbstractCegarLoop]: Abstraction has 19620 states and 26183 transitions. [2023-11-06 20:30:25,062 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 34.0) internal successors, (102), 3 states have internal predecessors, (102), 3 states have call successors, (11), 3 states have call predecessors, (11), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) [2023-11-06 20:30:25,062 INFO L276 IsEmpty]: Start isEmpty. Operand 19620 states and 26183 transitions. [2023-11-06 20:30:25,126 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 149 [2023-11-06 20:30:25,126 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 20:30:25,127 INFO L195 NwaCegarLoop]: trace histogram [5, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 20:30:25,139 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_14072271-7222-41d6-96bc-9a6f4d4a5c7e/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2023-11-06 20:30:25,334 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_14072271-7222-41d6-96bc-9a6f4d4a5c7e/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2023-11-06 20:30:25,335 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-06 20:30:25,335 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 20:30:25,335 INFO L85 PathProgramCache]: Analyzing trace with hash -1598559207, now seen corresponding path program 1 times [2023-11-06 20:30:25,336 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 20:30:25,336 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1615698801] [2023-11-06 20:30:25,336 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:30:25,336 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 20:30:25,385 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:30:26,046 INFO L134 CoverageAnalysis]: Checked inductivity of 109 backedges. 12 proven. 44 refuted. 0 times theorem prover too weak. 53 trivial. 0 not checked. [2023-11-06 20:30:26,047 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 20:30:26,047 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1615698801] [2023-11-06 20:30:26,047 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1615698801] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-06 20:30:26,047 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1005048538] [2023-11-06 20:30:26,048 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:30:26,048 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 20:30:26,048 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_14072271-7222-41d6-96bc-9a6f4d4a5c7e/bin/utaipan-verify-FOvIYxoinp/z3 [2023-11-06 20:30:26,049 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_14072271-7222-41d6-96bc-9a6f4d4a5c7e/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-06 20:30:26,080 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_14072271-7222-41d6-96bc-9a6f4d4a5c7e/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-11-06 20:30:26,284 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:30:26,289 INFO L262 TraceCheckSpWp]: Trace formula consists of 869 conjuncts, 24 conjunts are in the unsatisfiable core [2023-11-06 20:30:26,295 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-06 20:30:26,756 INFO L134 CoverageAnalysis]: Checked inductivity of 109 backedges. 70 proven. 17 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2023-11-06 20:30:26,756 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-06 20:30:27,199 INFO L134 CoverageAnalysis]: Checked inductivity of 109 backedges. 13 proven. 44 refuted. 0 times theorem prover too weak. 52 trivial. 0 not checked. [2023-11-06 20:30:27,199 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1005048538] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-06 20:30:27,199 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [397045018] [2023-11-06 20:30:27,226 INFO L159 IcfgInterpreter]: Started Sifa with 78 locations of interest [2023-11-06 20:30:27,226 INFO L166 IcfgInterpreter]: Building call graph [2023-11-06 20:30:27,231 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-06 20:30:27,237 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-06 20:30:27,237 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs