./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/systemc/token_ring.13.cil-1.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 53f42b1a Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab1043d5-2658-44f7-8317-a94a0a52e3b7/bin/utaipan-TEXQjIfE4P/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab1043d5-2658-44f7-8317-a94a0a52e3b7/bin/utaipan-TEXQjIfE4P/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab1043d5-2658-44f7-8317-a94a0a52e3b7/bin/utaipan-TEXQjIfE4P/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab1043d5-2658-44f7-8317-a94a0a52e3b7/bin/utaipan-TEXQjIfE4P/config/TaipanReach.xml -i ../../sv-benchmarks/c/systemc/token_ring.13.cil-1.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab1043d5-2658-44f7-8317-a94a0a52e3b7/bin/utaipan-TEXQjIfE4P/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab1043d5-2658-44f7-8317-a94a0a52e3b7/bin/utaipan-TEXQjIfE4P --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 1b2c6a3c4af8091017033117c21d8fbc40cee2009788b890a114045d77587077 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-53f42b1 [2021-11-21 00:51:28,200 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-21 00:51:28,203 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-21 00:51:28,235 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-21 00:51:28,236 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-21 00:51:28,238 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-21 00:51:28,240 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-21 00:51:28,242 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-21 00:51:28,245 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-21 00:51:28,246 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-21 00:51:28,248 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-21 00:51:28,249 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-21 00:51:28,250 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-21 00:51:28,251 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-21 00:51:28,253 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-21 00:51:28,255 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-21 00:51:28,257 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-21 00:51:28,258 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-21 00:51:28,260 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-21 00:51:28,263 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-21 00:51:28,265 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-21 00:51:28,267 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-21 00:51:28,269 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-21 00:51:28,270 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-21 00:51:28,274 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-21 00:51:28,275 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-21 00:51:28,275 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-21 00:51:28,276 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-21 00:51:28,277 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-21 00:51:28,278 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-21 00:51:28,279 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-21 00:51:28,280 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-21 00:51:28,281 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-21 00:51:28,282 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-21 00:51:28,283 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-21 00:51:28,284 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-21 00:51:28,285 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-21 00:51:28,285 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-21 00:51:28,286 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-21 00:51:28,287 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-21 00:51:28,288 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-21 00:51:28,289 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab1043d5-2658-44f7-8317-a94a0a52e3b7/bin/utaipan-TEXQjIfE4P/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-21 00:51:28,315 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-21 00:51:28,315 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-21 00:51:28,316 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-21 00:51:28,316 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-21 00:51:28,317 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-21 00:51:28,317 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-21 00:51:28,317 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-21 00:51:28,318 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-21 00:51:28,318 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-21 00:51:28,318 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-21 00:51:28,318 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-21 00:51:28,319 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-21 00:51:28,319 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-21 00:51:28,319 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-21 00:51:28,319 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-21 00:51:28,320 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-21 00:51:28,320 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-21 00:51:28,320 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-21 00:51:28,321 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-21 00:51:28,321 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-21 00:51:28,322 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-21 00:51:28,322 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-21 00:51:28,322 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-21 00:51:28,322 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-21 00:51:28,323 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-21 00:51:28,323 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-21 00:51:28,323 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-21 00:51:28,323 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-21 00:51:28,324 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-21 00:51:28,324 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-21 00:51:28,324 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-21 00:51:28,324 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-21 00:51:28,325 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-21 00:51:28,325 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-21 00:51:28,325 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-21 00:51:28,326 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-21 00:51:28,326 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-21 00:51:28,326 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-21 00:51:28,326 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-21 00:51:28,326 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-21 00:51:28,327 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-21 00:51:28,327 INFO L138 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_ab1043d5-2658-44f7-8317-a94a0a52e3b7/bin/utaipan-TEXQjIfE4P/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab1043d5-2658-44f7-8317-a94a0a52e3b7/bin/utaipan-TEXQjIfE4P Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 1b2c6a3c4af8091017033117c21d8fbc40cee2009788b890a114045d77587077 [2021-11-21 00:51:28,588 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-21 00:51:28,613 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-21 00:51:28,616 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-21 00:51:28,617 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-21 00:51:28,619 INFO L275 PluginConnector]: CDTParser initialized [2021-11-21 00:51:28,620 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab1043d5-2658-44f7-8317-a94a0a52e3b7/bin/utaipan-TEXQjIfE4P/../../sv-benchmarks/c/systemc/token_ring.13.cil-1.c [2021-11-21 00:51:28,686 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab1043d5-2658-44f7-8317-a94a0a52e3b7/bin/utaipan-TEXQjIfE4P/data/b06a593a8/9bd36e932fe844b3ae775750c35e0ba4/FLAG78f0839bf [2021-11-21 00:51:29,280 INFO L306 CDTParser]: Found 1 translation units. [2021-11-21 00:51:29,281 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab1043d5-2658-44f7-8317-a94a0a52e3b7/sv-benchmarks/c/systemc/token_ring.13.cil-1.c [2021-11-21 00:51:29,300 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab1043d5-2658-44f7-8317-a94a0a52e3b7/bin/utaipan-TEXQjIfE4P/data/b06a593a8/9bd36e932fe844b3ae775750c35e0ba4/FLAG78f0839bf [2021-11-21 00:51:29,579 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab1043d5-2658-44f7-8317-a94a0a52e3b7/bin/utaipan-TEXQjIfE4P/data/b06a593a8/9bd36e932fe844b3ae775750c35e0ba4 [2021-11-21 00:51:29,582 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-21 00:51:29,584 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-21 00:51:29,586 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-21 00:51:29,586 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-21 00:51:29,596 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-21 00:51:29,597 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 12:51:29" (1/1) ... [2021-11-21 00:51:29,603 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@254cfe60 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:51:29, skipping insertion in model container [2021-11-21 00:51:29,603 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 12:51:29" (1/1) ... [2021-11-21 00:51:29,612 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-21 00:51:29,690 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-21 00:51:29,867 WARN L230 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_ab1043d5-2658-44f7-8317-a94a0a52e3b7/sv-benchmarks/c/systemc/token_ring.13.cil-1.c[671,684] [2021-11-21 00:51:30,012 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-21 00:51:30,028 INFO L203 MainTranslator]: Completed pre-run [2021-11-21 00:51:30,044 WARN L230 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_ab1043d5-2658-44f7-8317-a94a0a52e3b7/sv-benchmarks/c/systemc/token_ring.13.cil-1.c[671,684] [2021-11-21 00:51:30,152 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-21 00:51:30,191 INFO L208 MainTranslator]: Completed translation [2021-11-21 00:51:30,192 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:51:30 WrapperNode [2021-11-21 00:51:30,192 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-21 00:51:30,193 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-21 00:51:30,193 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-21 00:51:30,194 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-21 00:51:30,202 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:51:30" (1/1) ... [2021-11-21 00:51:30,221 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:51:30" (1/1) ... [2021-11-21 00:51:30,293 INFO L137 Inliner]: procedures = 54, calls = 71, calls flagged for inlining = 37, calls inlined = 37, statements flattened = 916 [2021-11-21 00:51:30,294 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-21 00:51:30,295 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-21 00:51:30,295 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-21 00:51:30,295 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-21 00:51:30,313 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:51:30" (1/1) ... [2021-11-21 00:51:30,313 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:51:30" (1/1) ... [2021-11-21 00:51:30,320 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:51:30" (1/1) ... [2021-11-21 00:51:30,321 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:51:30" (1/1) ... [2021-11-21 00:51:30,368 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:51:30" (1/1) ... [2021-11-21 00:51:30,396 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:51:30" (1/1) ... [2021-11-21 00:51:30,400 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:51:30" (1/1) ... [2021-11-21 00:51:30,407 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-21 00:51:30,407 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-21 00:51:30,408 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-21 00:51:30,424 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-21 00:51:30,425 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:51:30" (1/1) ... [2021-11-21 00:51:30,442 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-21 00:51:30,458 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab1043d5-2658-44f7-8317-a94a0a52e3b7/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:51:30,482 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab1043d5-2658-44f7-8317-a94a0a52e3b7/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-21 00:51:30,504 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab1043d5-2658-44f7-8317-a94a0a52e3b7/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-21 00:51:30,540 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-21 00:51:30,541 INFO L130 BoogieDeclarations]: Found specification of procedure activate_threads [2021-11-21 00:51:30,541 INFO L138 BoogieDeclarations]: Found implementation of procedure activate_threads [2021-11-21 00:51:30,542 INFO L130 BoogieDeclarations]: Found specification of procedure immediate_notify [2021-11-21 00:51:30,542 INFO L138 BoogieDeclarations]: Found implementation of procedure immediate_notify [2021-11-21 00:51:30,542 INFO L130 BoogieDeclarations]: Found specification of procedure update_channels [2021-11-21 00:51:30,542 INFO L138 BoogieDeclarations]: Found implementation of procedure update_channels [2021-11-21 00:51:30,542 INFO L130 BoogieDeclarations]: Found specification of procedure error [2021-11-21 00:51:30,543 INFO L138 BoogieDeclarations]: Found implementation of procedure error [2021-11-21 00:51:30,543 INFO L130 BoogieDeclarations]: Found specification of procedure fire_delta_events [2021-11-21 00:51:30,543 INFO L138 BoogieDeclarations]: Found implementation of procedure fire_delta_events [2021-11-21 00:51:30,543 INFO L130 BoogieDeclarations]: Found specification of procedure exists_runnable_thread [2021-11-21 00:51:30,543 INFO L138 BoogieDeclarations]: Found implementation of procedure exists_runnable_thread [2021-11-21 00:51:30,543 INFO L130 BoogieDeclarations]: Found specification of procedure reset_delta_events [2021-11-21 00:51:30,543 INFO L138 BoogieDeclarations]: Found implementation of procedure reset_delta_events [2021-11-21 00:51:30,543 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-21 00:51:30,544 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-21 00:51:30,544 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-21 00:51:30,755 INFO L236 CfgBuilder]: Building ICFG [2021-11-21 00:51:30,756 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-21 00:51:31,785 INFO L277 CfgBuilder]: Performing block encoding [2021-11-21 00:51:32,267 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-21 00:51:32,267 INFO L301 CfgBuilder]: Removed 16 assume(true) statements. [2021-11-21 00:51:32,272 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 12:51:32 BoogieIcfgContainer [2021-11-21 00:51:32,272 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-21 00:51:32,275 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-21 00:51:32,275 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-21 00:51:32,278 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-21 00:51:32,279 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.11 12:51:29" (1/3) ... [2021-11-21 00:51:32,280 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3ef38b46 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 12:51:32, skipping insertion in model container [2021-11-21 00:51:32,280 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:51:30" (2/3) ... [2021-11-21 00:51:32,281 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3ef38b46 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 12:51:32, skipping insertion in model container [2021-11-21 00:51:32,281 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 12:51:32" (3/3) ... [2021-11-21 00:51:32,285 INFO L111 eAbstractionObserver]: Analyzing ICFG token_ring.13.cil-1.c [2021-11-21 00:51:32,296 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-21 00:51:32,296 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-21 00:51:32,370 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-21 00:51:32,377 INFO L339 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, mLoopAccelerationTechnique=FAST_UPR [2021-11-21 00:51:32,377 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-21 00:51:32,402 INFO L276 IsEmpty]: Start isEmpty. Operand has 205 states, 167 states have (on average 1.5688622754491017) internal successors, (262), 171 states have internal predecessors, (262), 29 states have call successors, (29), 7 states have call predecessors, (29), 7 states have return successors, (29), 28 states have call predecessors, (29), 29 states have call successors, (29) [2021-11-21 00:51:32,413 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2021-11-21 00:51:32,413 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:51:32,414 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:51:32,415 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:51:32,420 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:51:32,421 INFO L85 PathProgramCache]: Analyzing trace with hash -1630160683, now seen corresponding path program 1 times [2021-11-21 00:51:32,461 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:51:32,462 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1599466335] [2021-11-21 00:51:32,463 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:51:32,464 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:51:32,633 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:51:32,928 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:51:32,929 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:51:32,929 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1599466335] [2021-11-21 00:51:32,930 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1599466335] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:51:32,930 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:51:32,930 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-21 00:51:32,932 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1742207744] [2021-11-21 00:51:32,933 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:51:32,938 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-21 00:51:32,938 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:51:32,976 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-21 00:51:32,978 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-21 00:51:32,985 INFO L87 Difference]: Start difference. First operand has 205 states, 167 states have (on average 1.5688622754491017) internal successors, (262), 171 states have internal predecessors, (262), 29 states have call successors, (29), 7 states have call predecessors, (29), 7 states have return successors, (29), 28 states have call predecessors, (29), 29 states have call successors, (29) Second operand has 4 states, 4 states have (on average 14.75) internal successors, (59), 4 states have internal predecessors, (59), 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) [2021-11-21 00:51:33,631 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:51:33,632 INFO L93 Difference]: Finished difference Result 591 states and 958 transitions. [2021-11-21 00:51:33,633 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-21 00:51:33,635 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 14.75) internal successors, (59), 4 states have internal predecessors, (59), 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 70 [2021-11-21 00:51:33,635 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:51:33,664 INFO L225 Difference]: With dead ends: 591 [2021-11-21 00:51:33,666 INFO L226 Difference]: Without dead ends: 387 [2021-11-21 00:51:33,677 INFO L932 BasicCegarLoop]: 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 [2021-11-21 00:51:33,683 INFO L933 BasicCegarLoop]: 491 mSDtfsCounter, 549 mSDsluCounter, 487 mSDsCounter, 0 mSdLazyCounter, 316 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 549 SdHoareTripleChecker+Valid, 878 SdHoareTripleChecker+Invalid, 329 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 316 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-21 00:51:33,685 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [549 Valid, 878 Invalid, 329 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 316 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-21 00:51:33,707 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 387 states. [2021-11-21 00:51:33,780 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 387 to 386. [2021-11-21 00:51:33,782 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 386 states, 321 states have (on average 1.5264797507788161) internal successors, (490), 324 states have internal predecessors, (490), 52 states have call successors, (52), 13 states have call predecessors, (52), 12 states have return successors, (50), 49 states have call predecessors, (50), 50 states have call successors, (50) [2021-11-21 00:51:33,787 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 386 states to 386 states and 592 transitions. [2021-11-21 00:51:33,789 INFO L78 Accepts]: Start accepts. Automaton has 386 states and 592 transitions. Word has length 70 [2021-11-21 00:51:33,789 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:51:33,790 INFO L470 AbstractCegarLoop]: Abstraction has 386 states and 592 transitions. [2021-11-21 00:51:33,790 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 14.75) internal successors, (59), 4 states have internal predecessors, (59), 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) [2021-11-21 00:51:33,790 INFO L276 IsEmpty]: Start isEmpty. Operand 386 states and 592 transitions. [2021-11-21 00:51:33,802 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 144 [2021-11-21 00:51:33,802 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:51:33,802 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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] [2021-11-21 00:51:33,803 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-21 00:51:33,803 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:51:33,804 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:51:33,804 INFO L85 PathProgramCache]: Analyzing trace with hash -1138477103, now seen corresponding path program 1 times [2021-11-21 00:51:33,805 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:51:33,805 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1950511505] [2021-11-21 00:51:33,805 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:51:33,805 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:51:33,871 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:51:34,114 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-21 00:51:34,115 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:51:34,115 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1950511505] [2021-11-21 00:51:34,115 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1950511505] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:51:34,116 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2087664697] [2021-11-21 00:51:34,116 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:51:34,116 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:51:34,117 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab1043d5-2658-44f7-8317-a94a0a52e3b7/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:51:34,118 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab1043d5-2658-44f7-8317-a94a0a52e3b7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:51:34,126 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab1043d5-2658-44f7-8317-a94a0a52e3b7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-21 00:51:34,419 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:51:34,425 INFO L263 TraceCheckSpWp]: Trace formula consists of 1063 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-21 00:51:34,437 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:51:34,815 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 29 proven. 0 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-21 00:51:34,817 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 00:51:34,819 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2087664697] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:51:34,822 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-21 00:51:34,823 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2021-11-21 00:51:34,823 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1668900913] [2021-11-21 00:51:34,824 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:51:34,826 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 00:51:34,827 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:51:34,827 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 00:51:34,831 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-21 00:51:34,831 INFO L87 Difference]: Start difference. First operand 386 states and 592 transitions. Second operand has 3 states, 3 states have (on average 35.333333333333336) internal successors, (106), 2 states have internal predecessors, (106), 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) [2021-11-21 00:51:35,030 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:51:35,030 INFO L93 Difference]: Finished difference Result 1141 states and 1781 transitions. [2021-11-21 00:51:35,031 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 00:51:35,031 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 35.333333333333336) internal successors, (106), 2 states have internal predecessors, (106), 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 143 [2021-11-21 00:51:35,031 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:51:35,042 INFO L225 Difference]: With dead ends: 1141 [2021-11-21 00:51:35,042 INFO L226 Difference]: Without dead ends: 760 [2021-11-21 00:51:35,045 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 147 GetRequests, 143 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-21 00:51:35,047 INFO L933 BasicCegarLoop]: 319 mSDtfsCounter, 266 mSDsluCounter, 294 mSDsCounter, 0 mSdLazyCounter, 112 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 266 SdHoareTripleChecker+Valid, 566 SdHoareTripleChecker+Invalid, 114 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 112 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 00:51:35,048 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [266 Valid, 566 Invalid, 114 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 112 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 00:51:35,053 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 760 states. [2021-11-21 00:51:35,125 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 760 to 754. [2021-11-21 00:51:35,128 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 754 states, 633 states have (on average 1.5244865718799367) internal successors, (965), 637 states have internal predecessors, (965), 96 states have call successors, (96), 25 states have call predecessors, (96), 24 states have return successors, (94), 92 states have call predecessors, (94), 94 states have call successors, (94) [2021-11-21 00:51:35,138 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 754 states to 754 states and 1155 transitions. [2021-11-21 00:51:35,139 INFO L78 Accepts]: Start accepts. Automaton has 754 states and 1155 transitions. Word has length 143 [2021-11-21 00:51:35,140 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:51:35,141 INFO L470 AbstractCegarLoop]: Abstraction has 754 states and 1155 transitions. [2021-11-21 00:51:35,141 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 35.333333333333336) internal successors, (106), 2 states have internal predecessors, (106), 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) [2021-11-21 00:51:35,141 INFO L276 IsEmpty]: Start isEmpty. Operand 754 states and 1155 transitions. [2021-11-21 00:51:35,156 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 144 [2021-11-21 00:51:35,156 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:51:35,156 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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] [2021-11-21 00:51:35,198 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab1043d5-2658-44f7-8317-a94a0a52e3b7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-21 00:51:35,372 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab1043d5-2658-44f7-8317-a94a0a52e3b7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:51:35,372 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:51:35,373 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:51:35,373 INFO L85 PathProgramCache]: Analyzing trace with hash -2125159409, now seen corresponding path program 1 times [2021-11-21 00:51:35,373 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:51:35,373 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [170723816] [2021-11-21 00:51:35,374 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:51:35,374 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:51:35,424 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:51:35,555 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-21 00:51:35,556 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:51:35,556 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [170723816] [2021-11-21 00:51:35,556 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [170723816] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:51:35,559 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [778167042] [2021-11-21 00:51:35,559 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:51:35,560 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:51:35,560 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab1043d5-2658-44f7-8317-a94a0a52e3b7/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:51:35,566 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab1043d5-2658-44f7-8317-a94a0a52e3b7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:51:35,584 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab1043d5-2658-44f7-8317-a94a0a52e3b7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-21 00:51:35,818 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:51:35,823 INFO L263 TraceCheckSpWp]: Trace formula consists of 1057 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-21 00:51:35,830 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:51:36,114 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 35 proven. 0 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-11-21 00:51:36,114 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 00:51:36,115 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [778167042] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:51:36,115 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-21 00:51:36,115 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2021-11-21 00:51:36,115 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1831966284] [2021-11-21 00:51:36,116 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:51:36,117 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 00:51:36,118 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:51:36,118 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 00:51:36,119 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-21 00:51:36,119 INFO L87 Difference]: Start difference. First operand 754 states and 1155 transitions. Second operand has 3 states, 3 states have (on average 37.333333333333336) internal successors, (112), 2 states have internal predecessors, (112), 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) [2021-11-21 00:51:36,336 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:51:36,336 INFO L93 Difference]: Finished difference Result 2239 states and 3490 transitions. [2021-11-21 00:51:36,336 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 00:51:36,337 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 37.333333333333336) internal successors, (112), 2 states have internal predecessors, (112), 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 143 [2021-11-21 00:51:36,337 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:51:36,351 INFO L225 Difference]: With dead ends: 2239 [2021-11-21 00:51:36,351 INFO L226 Difference]: Without dead ends: 1490 [2021-11-21 00:51:36,354 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 147 GetRequests, 143 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-21 00:51:36,357 INFO L933 BasicCegarLoop]: 289 mSDtfsCounter, 260 mSDsluCounter, 294 mSDsCounter, 0 mSdLazyCounter, 111 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 260 SdHoareTripleChecker+Valid, 536 SdHoareTripleChecker+Invalid, 113 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 111 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 00:51:36,359 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [260 Valid, 536 Invalid, 113 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 111 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 00:51:36,362 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1490 states. [2021-11-21 00:51:36,473 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1490 to 1482. [2021-11-21 00:51:36,481 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1482 states, 1251 states have (on average 1.5211830535571542) internal successors, (1903), 1257 states have internal predecessors, (1903), 182 states have call successors, (182), 49 states have call predecessors, (182), 48 states have return successors, (180), 176 states have call predecessors, (180), 180 states have call successors, (180) [2021-11-21 00:51:36,495 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1482 states to 1482 states and 2265 transitions. [2021-11-21 00:51:36,496 INFO L78 Accepts]: Start accepts. Automaton has 1482 states and 2265 transitions. Word has length 143 [2021-11-21 00:51:36,496 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:51:36,496 INFO L470 AbstractCegarLoop]: Abstraction has 1482 states and 2265 transitions. [2021-11-21 00:51:36,497 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 37.333333333333336) internal successors, (112), 2 states have internal predecessors, (112), 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) [2021-11-21 00:51:36,497 INFO L276 IsEmpty]: Start isEmpty. Operand 1482 states and 2265 transitions. [2021-11-21 00:51:36,504 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 144 [2021-11-21 00:51:36,504 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:51:36,505 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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] [2021-11-21 00:51:36,547 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab1043d5-2658-44f7-8317-a94a0a52e3b7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2021-11-21 00:51:36,728 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab1043d5-2658-44f7-8317-a94a0a52e3b7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:51:36,728 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:51:36,729 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:51:36,729 INFO L85 PathProgramCache]: Analyzing trace with hash 1566742221, now seen corresponding path program 1 times [2021-11-21 00:51:36,729 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:51:36,729 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1052532838] [2021-11-21 00:51:36,730 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:51:36,730 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:51:36,756 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:51:36,847 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-21 00:51:36,848 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:51:36,848 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1052532838] [2021-11-21 00:51:36,848 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1052532838] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:51:36,850 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1729051702] [2021-11-21 00:51:36,851 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:51:36,852 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:51:36,852 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab1043d5-2658-44f7-8317-a94a0a52e3b7/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:51:36,856 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab1043d5-2658-44f7-8317-a94a0a52e3b7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:51:36,863 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab1043d5-2658-44f7-8317-a94a0a52e3b7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-21 00:51:37,099 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:51:37,104 INFO L263 TraceCheckSpWp]: Trace formula consists of 1051 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-21 00:51:37,109 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:51:37,339 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2021-11-21 00:51:37,340 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 00:51:37,340 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1729051702] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:51:37,340 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-21 00:51:37,340 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2021-11-21 00:51:37,341 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [803919015] [2021-11-21 00:51:37,341 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:51:37,342 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 00:51:37,342 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:51:37,343 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 00:51:37,343 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-21 00:51:37,343 INFO L87 Difference]: Start difference. First operand 1482 states and 2265 transitions. Second operand has 3 states, 3 states have (on average 29.333333333333332) internal successors, (88), 2 states have internal predecessors, (88), 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) [2021-11-21 00:51:37,605 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:51:37,605 INFO L93 Difference]: Finished difference Result 4411 states and 6858 transitions. [2021-11-21 00:51:37,609 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 00:51:37,609 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 29.333333333333332) internal successors, (88), 2 states have internal predecessors, (88), 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 143 [2021-11-21 00:51:37,609 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:51:37,632 INFO L225 Difference]: With dead ends: 4411 [2021-11-21 00:51:37,632 INFO L226 Difference]: Without dead ends: 2934 [2021-11-21 00:51:37,641 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 147 GetRequests, 143 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-21 00:51:37,643 INFO L933 BasicCegarLoop]: 317 mSDtfsCounter, 284 mSDsluCounter, 294 mSDsCounter, 0 mSdLazyCounter, 112 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 284 SdHoareTripleChecker+Valid, 564 SdHoareTripleChecker+Invalid, 114 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 112 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 00:51:37,644 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [284 Valid, 564 Invalid, 114 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 112 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 00:51:37,649 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2934 states. [2021-11-21 00:51:37,782 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2934 to 2922. [2021-11-21 00:51:37,789 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2922 states, 2475 states have (on average 1.5171717171717172) internal successors, (3755), 2485 states have internal predecessors, (3755), 350 states have call successors, (350), 97 states have call predecessors, (350), 96 states have return successors, (348), 340 states have call predecessors, (348), 348 states have call successors, (348) [2021-11-21 00:51:37,811 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2922 states to 2922 states and 4453 transitions. [2021-11-21 00:51:37,812 INFO L78 Accepts]: Start accepts. Automaton has 2922 states and 4453 transitions. Word has length 143 [2021-11-21 00:51:37,813 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:51:37,813 INFO L470 AbstractCegarLoop]: Abstraction has 2922 states and 4453 transitions. [2021-11-21 00:51:37,813 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 29.333333333333332) internal successors, (88), 2 states have internal predecessors, (88), 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) [2021-11-21 00:51:37,813 INFO L276 IsEmpty]: Start isEmpty. Operand 2922 states and 4453 transitions. [2021-11-21 00:51:37,822 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 144 [2021-11-21 00:51:37,822 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:51:37,823 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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] [2021-11-21 00:51:37,863 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab1043d5-2658-44f7-8317-a94a0a52e3b7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-21 00:51:38,036 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab1043d5-2658-44f7-8317-a94a0a52e3b7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:51:38,036 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:51:38,037 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:51:38,037 INFO L85 PathProgramCache]: Analyzing trace with hash -418140277, now seen corresponding path program 1 times [2021-11-21 00:51:38,037 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:51:38,037 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2072776411] [2021-11-21 00:51:38,037 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:51:38,038 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:51:38,062 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:51:38,130 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-21 00:51:38,130 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:51:38,130 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2072776411] [2021-11-21 00:51:38,130 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2072776411] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:51:38,131 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1511280559] [2021-11-21 00:51:38,131 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:51:38,131 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:51:38,131 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab1043d5-2658-44f7-8317-a94a0a52e3b7/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:51:38,139 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab1043d5-2658-44f7-8317-a94a0a52e3b7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:51:38,181 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab1043d5-2658-44f7-8317-a94a0a52e3b7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-21 00:51:38,446 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:51:38,451 INFO L263 TraceCheckSpWp]: Trace formula consists of 1045 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-21 00:51:38,456 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:51:38,784 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 38 proven. 0 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-21 00:51:38,785 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 00:51:38,785 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1511280559] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:51:38,785 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-21 00:51:38,786 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2021-11-21 00:51:38,786 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [413023027] [2021-11-21 00:51:38,786 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:51:38,787 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 00:51:38,787 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:51:38,787 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 00:51:38,788 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-21 00:51:38,788 INFO L87 Difference]: Start difference. First operand 2922 states and 4453 transitions. Second operand has 3 states, 3 states have (on average 38.333333333333336) internal successors, (115), 2 states have internal predecessors, (115), 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) [2021-11-21 00:51:39,142 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:51:39,142 INFO L93 Difference]: Finished difference Result 8707 states and 13494 transitions. [2021-11-21 00:51:39,142 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 00:51:39,143 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 38.333333333333336) internal successors, (115), 2 states have internal predecessors, (115), 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 143 [2021-11-21 00:51:39,143 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:51:39,186 INFO L225 Difference]: With dead ends: 8707 [2021-11-21 00:51:39,187 INFO L226 Difference]: Without dead ends: 5790 [2021-11-21 00:51:39,200 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 147 GetRequests, 143 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-21 00:51:39,201 INFO L933 BasicCegarLoop]: 278 mSDtfsCounter, 257 mSDsluCounter, 294 mSDsCounter, 0 mSdLazyCounter, 108 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 257 SdHoareTripleChecker+Valid, 525 SdHoareTripleChecker+Invalid, 110 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 108 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 00:51:39,201 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [257 Valid, 525 Invalid, 110 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 108 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 00:51:39,210 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5790 states. [2021-11-21 00:51:39,512 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5790 to 5770. [2021-11-21 00:51:39,526 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5770 states, 4899 states have (on average 1.5127577056542152) internal successors, (7411), 4917 states have internal predecessors, (7411), 678 states have call successors, (678), 193 states have call predecessors, (678), 192 states have return successors, (676), 660 states have call predecessors, (676), 676 states have call successors, (676) [2021-11-21 00:51:39,554 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5770 states to 5770 states and 8765 transitions. [2021-11-21 00:51:39,555 INFO L78 Accepts]: Start accepts. Automaton has 5770 states and 8765 transitions. Word has length 143 [2021-11-21 00:51:39,556 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:51:39,556 INFO L470 AbstractCegarLoop]: Abstraction has 5770 states and 8765 transitions. [2021-11-21 00:51:39,556 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 38.333333333333336) internal successors, (115), 2 states have internal predecessors, (115), 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) [2021-11-21 00:51:39,557 INFO L276 IsEmpty]: Start isEmpty. Operand 5770 states and 8765 transitions. [2021-11-21 00:51:39,571 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 144 [2021-11-21 00:51:39,571 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:51:39,571 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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] [2021-11-21 00:51:39,616 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab1043d5-2658-44f7-8317-a94a0a52e3b7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-21 00:51:39,788 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab1043d5-2658-44f7-8317-a94a0a52e3b7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:51:39,788 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:51:39,789 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:51:39,789 INFO L85 PathProgramCache]: Analyzing trace with hash -1154292339, now seen corresponding path program 1 times [2021-11-21 00:51:39,789 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:51:39,789 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [977185102] [2021-11-21 00:51:39,789 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:51:39,789 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:51:39,818 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:51:39,899 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-21 00:51:39,899 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:51:39,900 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [977185102] [2021-11-21 00:51:39,900 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [977185102] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:51:39,900 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2056654136] [2021-11-21 00:51:39,900 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:51:39,900 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:51:39,901 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab1043d5-2658-44f7-8317-a94a0a52e3b7/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:51:39,901 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab1043d5-2658-44f7-8317-a94a0a52e3b7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:51:39,920 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab1043d5-2658-44f7-8317-a94a0a52e3b7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-21 00:51:40,170 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:51:40,175 INFO L263 TraceCheckSpWp]: Trace formula consists of 1039 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-21 00:51:40,179 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:51:40,389 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-11-21 00:51:40,390 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 00:51:40,390 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2056654136] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:51:40,390 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-21 00:51:40,390 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2021-11-21 00:51:40,391 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1680040790] [2021-11-21 00:51:40,391 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:51:40,391 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 00:51:40,392 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:51:40,392 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 00:51:40,392 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-21 00:51:40,393 INFO L87 Difference]: Start difference. First operand 5770 states and 8765 transitions. Second operand has 3 states, 3 states have (on average 28.333333333333332) internal successors, (85), 2 states have internal predecessors, (85), 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) [2021-11-21 00:51:40,941 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:51:40,941 INFO L93 Difference]: Finished difference Result 17203 states and 26566 transitions. [2021-11-21 00:51:40,942 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 00:51:40,942 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 28.333333333333332) internal successors, (85), 2 states have internal predecessors, (85), 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 143 [2021-11-21 00:51:40,943 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:51:41,039 INFO L225 Difference]: With dead ends: 17203 [2021-11-21 00:51:41,040 INFO L226 Difference]: Without dead ends: 11438 [2021-11-21 00:51:41,071 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 147 GetRequests, 143 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-21 00:51:41,072 INFO L933 BasicCegarLoop]: 315 mSDtfsCounter, 287 mSDsluCounter, 294 mSDsCounter, 0 mSdLazyCounter, 112 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 287 SdHoareTripleChecker+Valid, 562 SdHoareTripleChecker+Invalid, 114 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 112 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 00:51:41,073 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [287 Valid, 562 Invalid, 114 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 112 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 00:51:41,090 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11438 states. [2021-11-21 00:51:41,699 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11438 to 11402. [2021-11-21 00:51:41,745 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 11402 states, 9699 states have (on average 1.5080936178987525) internal successors, (14627), 9733 states have internal predecessors, (14627), 1318 states have call successors, (1318), 385 states have call predecessors, (1318), 384 states have return successors, (1316), 1284 states have call predecessors, (1316), 1316 states have call successors, (1316) [2021-11-21 00:51:41,873 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11402 states to 11402 states and 17261 transitions. [2021-11-21 00:51:41,875 INFO L78 Accepts]: Start accepts. Automaton has 11402 states and 17261 transitions. Word has length 143 [2021-11-21 00:51:41,875 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:51:41,876 INFO L470 AbstractCegarLoop]: Abstraction has 11402 states and 17261 transitions. [2021-11-21 00:51:41,877 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 28.333333333333332) internal successors, (85), 2 states have internal predecessors, (85), 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) [2021-11-21 00:51:41,877 INFO L276 IsEmpty]: Start isEmpty. Operand 11402 states and 17261 transitions. [2021-11-21 00:51:41,906 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 144 [2021-11-21 00:51:41,906 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:51:41,906 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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] [2021-11-21 00:51:41,949 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab1043d5-2658-44f7-8317-a94a0a52e3b7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-21 00:51:42,132 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab1043d5-2658-44f7-8317-a94a0a52e3b7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2021-11-21 00:51:42,132 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:51:42,133 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:51:42,133 INFO L85 PathProgramCache]: Analyzing trace with hash 320941071, now seen corresponding path program 1 times [2021-11-21 00:51:42,133 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:51:42,133 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1487716823] [2021-11-21 00:51:42,133 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:51:42,133 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:51:42,174 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:51:42,258 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-21 00:51:42,259 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:51:42,259 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1487716823] [2021-11-21 00:51:42,259 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1487716823] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:51:42,259 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1586498440] [2021-11-21 00:51:42,259 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:51:42,260 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:51:42,260 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab1043d5-2658-44f7-8317-a94a0a52e3b7/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:51:42,261 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab1043d5-2658-44f7-8317-a94a0a52e3b7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:51:42,282 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab1043d5-2658-44f7-8317-a94a0a52e3b7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-21 00:51:42,503 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:51:42,508 INFO L263 TraceCheckSpWp]: Trace formula consists of 1033 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-21 00:51:42,512 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:51:42,752 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 17 proven. 0 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-11-21 00:51:42,753 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 00:51:42,753 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1586498440] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:51:42,753 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-21 00:51:42,753 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2021-11-21 00:51:42,754 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [745332581] [2021-11-21 00:51:42,754 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:51:42,755 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 00:51:42,755 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:51:42,755 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 00:51:42,755 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-21 00:51:42,756 INFO L87 Difference]: Start difference. First operand 11402 states and 17261 transitions. Second operand has 3 states, 3 states have (on average 31.333333333333332) internal successors, (94), 2 states have internal predecessors, (94), 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) [2021-11-21 00:51:43,730 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:51:43,730 INFO L93 Difference]: Finished difference Result 34003 states and 52310 transitions. [2021-11-21 00:51:43,731 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 00:51:43,731 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 31.333333333333332) internal successors, (94), 2 states have internal predecessors, (94), 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 143 [2021-11-21 00:51:43,731 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:51:43,866 INFO L225 Difference]: With dead ends: 34003 [2021-11-21 00:51:43,867 INFO L226 Difference]: Without dead ends: 22606 [2021-11-21 00:51:43,920 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 147 GetRequests, 143 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-21 00:51:43,921 INFO L933 BasicCegarLoop]: 278 mSDtfsCounter, 278 mSDsluCounter, 294 mSDsCounter, 0 mSdLazyCounter, 108 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 278 SdHoareTripleChecker+Valid, 525 SdHoareTripleChecker+Invalid, 110 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 108 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 00:51:43,921 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [278 Valid, 525 Invalid, 110 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 108 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-21 00:51:43,955 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22606 states. [2021-11-21 00:51:45,023 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22606 to 22538. [2021-11-21 00:51:45,057 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22538 states, 19203 states have (on average 1.5032546997864917) internal successors, (28867), 19269 states have internal predecessors, (28867), 2566 states have call successors, (2566), 769 states have call predecessors, (2566), 768 states have return successors, (2564), 2500 states have call predecessors, (2564), 2564 states have call successors, (2564) [2021-11-21 00:51:45,153 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22538 states to 22538 states and 33997 transitions. [2021-11-21 00:51:45,156 INFO L78 Accepts]: Start accepts. Automaton has 22538 states and 33997 transitions. Word has length 143 [2021-11-21 00:51:45,156 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:51:45,160 INFO L470 AbstractCegarLoop]: Abstraction has 22538 states and 33997 transitions. [2021-11-21 00:51:45,161 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 31.333333333333332) internal successors, (94), 2 states have internal predecessors, (94), 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) [2021-11-21 00:51:45,161 INFO L276 IsEmpty]: Start isEmpty. Operand 22538 states and 33997 transitions. [2021-11-21 00:51:45,218 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 144 [2021-11-21 00:51:45,218 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:51:45,218 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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] [2021-11-21 00:51:45,260 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab1043d5-2658-44f7-8317-a94a0a52e3b7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-21 00:51:45,432 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab1043d5-2658-44f7-8317-a94a0a52e3b7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:51:45,432 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:51:45,433 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:51:45,433 INFO L85 PathProgramCache]: Analyzing trace with hash -1697961139, now seen corresponding path program 1 times [2021-11-21 00:51:45,433 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:51:45,433 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2063182580] [2021-11-21 00:51:45,433 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:51:45,433 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:51:45,479 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:51:45,546 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-21 00:51:45,547 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:51:45,547 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2063182580] [2021-11-21 00:51:45,547 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2063182580] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:51:45,547 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1151366322] [2021-11-21 00:51:45,547 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:51:45,548 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:51:45,548 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab1043d5-2658-44f7-8317-a94a0a52e3b7/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:51:45,549 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab1043d5-2658-44f7-8317-a94a0a52e3b7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:51:45,564 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab1043d5-2658-44f7-8317-a94a0a52e3b7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-21 00:51:45,780 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:51:45,786 INFO L263 TraceCheckSpWp]: Trace formula consists of 1027 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-21 00:51:45,790 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:51:46,083 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 23 proven. 0 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2021-11-21 00:51:46,084 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 00:51:46,084 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1151366322] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:51:46,084 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-21 00:51:46,084 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2021-11-21 00:51:46,085 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1620665725] [2021-11-21 00:51:46,085 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:51:46,085 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 00:51:46,085 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:51:46,086 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 00:51:46,086 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-21 00:51:46,086 INFO L87 Difference]: Start difference. First operand 22538 states and 33997 transitions. Second operand has 3 states, 3 states have (on average 33.333333333333336) internal successors, (100), 2 states have internal predecessors, (100), 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) [2021-11-21 00:51:47,966 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:51:47,966 INFO L93 Difference]: Finished difference Result 67219 states and 102998 transitions. [2021-11-21 00:51:47,966 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 00:51:47,967 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 33.333333333333336) internal successors, (100), 2 states have internal predecessors, (100), 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 143 [2021-11-21 00:51:47,967 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:51:48,233 INFO L225 Difference]: With dead ends: 67219 [2021-11-21 00:51:48,234 INFO L226 Difference]: Without dead ends: 44686 [2021-11-21 00:51:48,308 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 147 GetRequests, 143 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-21 00:51:48,309 INFO L933 BasicCegarLoop]: 278 mSDtfsCounter, 272 mSDsluCounter, 294 mSDsCounter, 0 mSdLazyCounter, 108 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 272 SdHoareTripleChecker+Valid, 525 SdHoareTripleChecker+Invalid, 110 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 108 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-21 00:51:48,310 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [272 Valid, 525 Invalid, 110 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 108 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-21 00:51:48,361 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44686 states. [2021-11-21 00:51:50,247 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44686 to 44554. [2021-11-21 00:51:50,323 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 44554 states, 38019 states have (on average 1.4982771772008732) internal successors, (56963), 38149 states have internal predecessors, (56963), 4998 states have call successors, (4998), 1537 states have call predecessors, (4998), 1536 states have return successors, (4996), 4868 states have call predecessors, (4996), 4996 states have call successors, (4996) [2021-11-21 00:51:50,844 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44554 states to 44554 states and 66957 transitions. [2021-11-21 00:51:50,850 INFO L78 Accepts]: Start accepts. Automaton has 44554 states and 66957 transitions. Word has length 143 [2021-11-21 00:51:50,850 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:51:50,850 INFO L470 AbstractCegarLoop]: Abstraction has 44554 states and 66957 transitions. [2021-11-21 00:51:50,851 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 33.333333333333336) internal successors, (100), 2 states have internal predecessors, (100), 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) [2021-11-21 00:51:50,851 INFO L276 IsEmpty]: Start isEmpty. Operand 44554 states and 66957 transitions. [2021-11-21 00:51:50,952 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 144 [2021-11-21 00:51:50,953 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:51:50,953 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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] [2021-11-21 00:51:50,990 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab1043d5-2658-44f7-8317-a94a0a52e3b7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2021-11-21 00:51:51,168 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ab1043d5-2658-44f7-8317-a94a0a52e3b7/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:51:51,168 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:51:51,169 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:51:51,169 INFO L85 PathProgramCache]: Analyzing trace with hash -1396903669, now seen corresponding path program 1 times [2021-11-21 00:51:51,169 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:51:51,169 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1905204829] [2021-11-21 00:51:51,169 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:51:51,169 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:51:51,236 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:51:51,340 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 46 trivial. 0 not checked. [2021-11-21 00:51:51,340 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:51:51,340 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1905204829] [2021-11-21 00:51:51,340 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1905204829] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:51:51,341 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:51:51,341 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-21 00:51:51,343 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2089422406] [2021-11-21 00:51:51,343 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:51:51,344 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-21 00:51:51,344 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:51:51,345 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-21 00:51:51,345 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-21 00:51:51,345 INFO L87 Difference]: Start difference. First operand 44554 states and 66957 transitions. Second operand has 6 states, 6 states have (on average 13.666666666666666) internal successors, (82), 6 states have internal predecessors, (82), 4 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2021-11-21 00:51:55,497 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:51:55,497 INFO L93 Difference]: Finished difference Result 156434 states and 234772 transitions. [2021-11-21 00:51:55,498 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-21 00:51:55,498 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 13.666666666666666) internal successors, (82), 6 states have internal predecessors, (82), 4 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) Word has length 143 [2021-11-21 00:51:55,499 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:51:56,581 INFO L225 Difference]: With dead ends: 156434 [2021-11-21 00:51:56,597 INFO L226 Difference]: Without dead ends: 111886 [2021-11-21 00:51:56,727 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=41, Invalid=69, Unknown=0, NotChecked=0, Total=110 [2021-11-21 00:51:56,730 INFO L933 BasicCegarLoop]: 288 mSDtfsCounter, 1229 mSDsluCounter, 608 mSDsCounter, 0 mSdLazyCounter, 322 mSolverCounterSat, 156 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1251 SdHoareTripleChecker+Valid, 793 SdHoareTripleChecker+Invalid, 478 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 156 IncrementalHoareTripleChecker+Valid, 322 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-21 00:51:56,730 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1251 Valid, 793 Invalid, 478 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [156 Valid, 322 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-21 00:51:56,833 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 111886 states. [2021-11-21 00:52:00,831 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 111886 to 87562. [2021-11-21 00:52:00,907 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 87562 states, 74755 states have (on average 1.493130894254565) internal successors, (111619), 75013 states have internal predecessors, (111619), 9734 states have call successors, (9734), 3073 states have call predecessors, (9734), 3072 states have return successors, (9732), 9476 states have call predecessors, (9732), 9732 states have call successors, (9732) [2021-11-21 00:52:01,364 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87562 states to 87562 states and 131085 transitions. [2021-11-21 00:52:01,379 INFO L78 Accepts]: Start accepts. Automaton has 87562 states and 131085 transitions. Word has length 143 [2021-11-21 00:52:01,381 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:52:01,381 INFO L470 AbstractCegarLoop]: Abstraction has 87562 states and 131085 transitions. [2021-11-21 00:52:01,382 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 13.666666666666666) internal successors, (82), 6 states have internal predecessors, (82), 4 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2021-11-21 00:52:01,382 INFO L276 IsEmpty]: Start isEmpty. Operand 87562 states and 131085 transitions. [2021-11-21 00:52:01,630 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 145 [2021-11-21 00:52:01,631 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:52:01,631 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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] [2021-11-21 00:52:01,631 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-11-21 00:52:01,631 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:52:01,632 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:52:01,632 INFO L85 PathProgramCache]: Analyzing trace with hash 1181035217, now seen corresponding path program 1 times [2021-11-21 00:52:01,632 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:52:01,632 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1523620643] [2021-11-21 00:52:01,633 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:52:01,633 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:52:01,686 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:52:01,811 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 46 trivial. 0 not checked. [2021-11-21 00:52:01,811 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:52:01,812 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1523620643] [2021-11-21 00:52:01,812 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1523620643] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:52:01,812 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:52:01,812 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-21 00:52:01,813 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1128594409] [2021-11-21 00:52:01,813 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:52:01,813 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-21 00:52:01,813 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:52:01,814 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-21 00:52:01,814 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-21 00:52:01,814 INFO L87 Difference]: Start difference. First operand 87562 states and 131085 transitions. Second operand has 6 states, 6 states have (on average 13.833333333333334) internal successors, (83), 6 states have internal predecessors, (83), 4 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2021-11-21 00:52:07,680 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:52:07,680 INFO L93 Difference]: Finished difference Result 240402 states and 360339 transitions. [2021-11-21 00:52:07,680 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-21 00:52:07,681 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 13.833333333333334) internal successors, (83), 6 states have internal predecessors, (83), 4 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) Word has length 144 [2021-11-21 00:52:07,681 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:52:08,503 INFO L225 Difference]: With dead ends: 240402 [2021-11-21 00:52:08,503 INFO L226 Difference]: Without dead ends: 152846 [2021-11-21 00:52:08,825 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=41, Invalid=69, Unknown=0, NotChecked=0, Total=110 [2021-11-21 00:52:08,825 INFO L933 BasicCegarLoop]: 273 mSDtfsCounter, 1089 mSDsluCounter, 674 mSDsCounter, 0 mSdLazyCounter, 319 mSolverCounterSat, 168 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1095 SdHoareTripleChecker+Valid, 838 SdHoareTripleChecker+Invalid, 487 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 168 IncrementalHoareTripleChecker+Valid, 319 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-21 00:52:08,826 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1095 Valid, 838 Invalid, 487 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [168 Valid, 319 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-21 00:52:08,990 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 152846 states. [2021-11-21 00:52:15,001 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 152846 to 130314. [2021-11-21 00:52:15,110 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 130314 states, 111235 states have (on average 1.4890547040050344) internal successors, (165635), 111621 states have internal predecessors, (165635), 14470 states have call successors, (14470), 4609 states have call predecessors, (14470), 4608 states have return successors, (14468), 14084 states have call predecessors, (14468), 14468 states have call successors, (14468) [2021-11-21 00:52:15,657 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 130314 states to 130314 states and 194573 transitions. [2021-11-21 00:52:15,676 INFO L78 Accepts]: Start accepts. Automaton has 130314 states and 194573 transitions. Word has length 144 [2021-11-21 00:52:15,676 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:52:15,677 INFO L470 AbstractCegarLoop]: Abstraction has 130314 states and 194573 transitions. [2021-11-21 00:52:15,677 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 13.833333333333334) internal successors, (83), 6 states have internal predecessors, (83), 4 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2021-11-21 00:52:15,677 INFO L276 IsEmpty]: Start isEmpty. Operand 130314 states and 194573 transitions. [2021-11-21 00:52:15,997 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 146 [2021-11-21 00:52:15,998 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:52:15,998 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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] [2021-11-21 00:52:15,998 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2021-11-21 00:52:15,999 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:52:15,999 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:52:15,999 INFO L85 PathProgramCache]: Analyzing trace with hash -466811577, now seen corresponding path program 1 times [2021-11-21 00:52:16,000 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:52:16,000 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2006390198] [2021-11-21 00:52:16,000 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:52:16,000 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:52:16,039 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:52:16,133 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 46 trivial. 0 not checked. [2021-11-21 00:52:16,134 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:52:16,134 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2006390198] [2021-11-21 00:52:16,134 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2006390198] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:52:16,134 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:52:16,135 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-21 00:52:16,135 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [108631776] [2021-11-21 00:52:16,135 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:52:16,136 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-21 00:52:16,136 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:52:16,137 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-21 00:52:16,137 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-21 00:52:16,138 INFO L87 Difference]: Start difference. First operand 130314 states and 194573 transitions. Second operand has 6 states, 6 states have (on average 14.0) internal successors, (84), 6 states have internal predecessors, (84), 4 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2021-11-21 00:52:25,571 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:52:25,571 INFO L93 Difference]: Finished difference Result 355346 states and 531859 transitions. [2021-11-21 00:52:25,572 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-21 00:52:25,572 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 14.0) internal successors, (84), 6 states have internal predecessors, (84), 4 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) Word has length 145 [2021-11-21 00:52:25,572 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:52:26,997 INFO L225 Difference]: With dead ends: 355346 [2021-11-21 00:52:26,998 INFO L226 Difference]: Without dead ends: 225038 [2021-11-21 00:52:27,256 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=41, Invalid=69, Unknown=0, NotChecked=0, Total=110 [2021-11-21 00:52:27,257 INFO L933 BasicCegarLoop]: 273 mSDtfsCounter, 1006 mSDsluCounter, 896 mSDsCounter, 0 mSdLazyCounter, 413 mSolverCounterSat, 168 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1012 SdHoareTripleChecker+Valid, 1021 SdHoareTripleChecker+Invalid, 581 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 168 IncrementalHoareTripleChecker+Valid, 413 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-21 00:52:27,258 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1012 Valid, 1021 Invalid, 581 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [168 Valid, 413 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-21 00:52:27,433 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 225038 states.