./Ultimate.py --spec ../../../trunk/examples/svcomp/properties/no-data-race.prp --file ../../../trunk/examples/svcomp/goblint-regression/28-race_reach_71-funloop_racing.i --full-output --traceabstraction.when.to.check.the.insufficient.erros.location.relative.to.the.other.error.locations BEFORE --architecture 32bit -------------------------------------------------------------------------------- Checking for data races Using default analysis Version b8dbc81d Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/config -Xmx15G -Xms4m -jar /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data -tc /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/AutomizerReach.xml -i ../../../trunk/examples/svcomp/goblint-regression/28-race_reach_71-funloop_racing.i -s /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-DataRace-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! data-race) ) --witnessprinter.graph.data.producer Automizer --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash bde6fe221f69c3fccb0f7c90e011f0b13ab5ca582ddcd328a459cbb512a8fd7f --traceabstraction.when.to.check.the.insufficient.erros.location.relative.to.the.other.error.locations BEFORE --- Real Ultimate output --- This is Ultimate 0.2.3-?-b8dbc81 [2023-08-31 20:59:21,339 INFO L177 SettingsManager]: Resetting all preferences to default values... [2023-08-31 20:59:21,340 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2023-08-31 20:59:21,357 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2023-08-31 20:59:21,361 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2023-08-31 20:59:21,361 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2023-08-31 20:59:21,362 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2023-08-31 20:59:21,365 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2023-08-31 20:59:21,366 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2023-08-31 20:59:21,368 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2023-08-31 20:59:21,369 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2023-08-31 20:59:21,370 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2023-08-31 20:59:21,371 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2023-08-31 20:59:21,373 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2023-08-31 20:59:21,373 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2023-08-31 20:59:21,375 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2023-08-31 20:59:21,376 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2023-08-31 20:59:21,378 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2023-08-31 20:59:21,379 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2023-08-31 20:59:21,380 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2023-08-31 20:59:21,383 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2023-08-31 20:59:21,390 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2023-08-31 20:59:21,391 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2023-08-31 20:59:21,391 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2023-08-31 20:59:21,394 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2023-08-31 20:59:21,394 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2023-08-31 20:59:21,394 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2023-08-31 20:59:21,395 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2023-08-31 20:59:21,395 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2023-08-31 20:59:21,396 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2023-08-31 20:59:21,396 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2023-08-31 20:59:21,396 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2023-08-31 20:59:21,397 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2023-08-31 20:59:21,397 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2023-08-31 20:59:21,398 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2023-08-31 20:59:21,398 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2023-08-31 20:59:21,399 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2023-08-31 20:59:21,399 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2023-08-31 20:59:21,399 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2023-08-31 20:59:21,400 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2023-08-31 20:59:21,400 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2023-08-31 20:59:21,401 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-DataRace-32bit-Automizer_Default.epf [2023-08-31 20:59:21,416 INFO L113 SettingsManager]: Loading preferences was successful [2023-08-31 20:59:21,417 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2023-08-31 20:59:21,418 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-08-31 20:59:21,418 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-08-31 20:59:21,419 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-08-31 20:59:21,419 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-08-31 20:59:21,420 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2023-08-31 20:59:21,420 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2023-08-31 20:59:21,420 INFO L138 SettingsManager]: * Use SBE=true [2023-08-31 20:59:21,420 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-08-31 20:59:21,421 INFO L138 SettingsManager]: * sizeof long=4 [2023-08-31 20:59:21,421 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2023-08-31 20:59:21,421 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2023-08-31 20:59:21,421 INFO L138 SettingsManager]: * sizeof POINTER=4 [2023-08-31 20:59:21,421 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2023-08-31 20:59:21,422 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-08-31 20:59:21,422 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-08-31 20:59:21,422 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-08-31 20:59:21,422 INFO L138 SettingsManager]: * Check absence of data races in concurrent programs=true [2023-08-31 20:59:21,422 INFO L138 SettingsManager]: * sizeof long double=12 [2023-08-31 20:59:21,422 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2023-08-31 20:59:21,422 INFO L138 SettingsManager]: * Use constant arrays=true [2023-08-31 20:59:21,423 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-08-31 20:59:21,423 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-08-31 20:59:21,423 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2023-08-31 20:59:21,423 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2023-08-31 20:59:21,423 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-08-31 20:59:21,423 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-08-31 20:59:21,423 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-08-31 20:59:21,424 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2023-08-31 20:59:21,424 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2023-08-31 20:59:21,424 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-08-31 20:59:21,424 INFO L138 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2023-08-31 20:59:21,424 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-08-31 20:59:21,424 INFO L138 SettingsManager]: * Order on configurations for Petri net unfoldings=DBO [2023-08-31 20:59:21,425 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-08-31 20:59:21,425 INFO L138 SettingsManager]: * Independence relation used for large block encoding in concurrent analysis=SYNTACTIC [2023-08-31 20:59:21,425 INFO L138 SettingsManager]: * Looper check in Petri net analysis=SEMANTIC WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! data-race) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> bde6fe221f69c3fccb0f7c90e011f0b13ab5ca582ddcd328a459cbb512a8fd7f Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: When to check the insufficient erros location relative to the other error locations -> BEFORE [2023-08-31 20:59:21,668 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-08-31 20:59:21,686 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-08-31 20:59:21,688 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-08-31 20:59:21,689 INFO L271 PluginConnector]: Initializing CDTParser... [2023-08-31 20:59:21,689 INFO L275 PluginConnector]: CDTParser initialized [2023-08-31 20:59:21,690 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/goblint-regression/28-race_reach_71-funloop_racing.i [2023-08-31 20:59:22,623 INFO L500 CDTParser]: Created temporary CDT project at NULL [2023-08-31 20:59:22,826 INFO L351 CDTParser]: Found 1 translation units. [2023-08-31 20:59:22,826 INFO L172 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/goblint-regression/28-race_reach_71-funloop_racing.i [2023-08-31 20:59:22,837 INFO L394 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c40851e32/87a972b401ab4859adb4dd7c10ae97a5/FLAG1fbd57757 [2023-08-31 20:59:22,846 INFO L402 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c40851e32/87a972b401ab4859adb4dd7c10ae97a5 [2023-08-31 20:59:22,848 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-08-31 20:59:22,849 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2023-08-31 20:59:22,850 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-08-31 20:59:22,850 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-08-31 20:59:22,852 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2023-08-31 20:59:22,852 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 31.08 08:59:22" (1/1) ... [2023-08-31 20:59:22,853 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7a742196 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.08 08:59:22, skipping insertion in model container [2023-08-31 20:59:22,853 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 31.08 08:59:22" (1/1) ... [2023-08-31 20:59:22,857 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2023-08-31 20:59:22,886 INFO L178 MainTranslator]: Built tables and reachable declarations [2023-08-31 20:59:23,215 WARN L247 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/goblint-regression/28-race_reach_71-funloop_racing.i[41323,41336] [2023-08-31 20:59:23,249 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-08-31 20:59:23,267 INFO L203 MainTranslator]: Completed pre-run [2023-08-31 20:59:23,300 WARN L247 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/goblint-regression/28-race_reach_71-funloop_racing.i[41323,41336] [2023-08-31 20:59:23,321 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-08-31 20:59:23,371 INFO L208 MainTranslator]: Completed translation [2023-08-31 20:59:23,371 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.08 08:59:23 WrapperNode [2023-08-31 20:59:23,371 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-08-31 20:59:23,372 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-08-31 20:59:23,372 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-08-31 20:59:23,373 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2023-08-31 20:59:23,377 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.08 08:59:23" (1/1) ... [2023-08-31 20:59:23,401 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.08 08:59:23" (1/1) ... [2023-08-31 20:59:23,437 INFO L138 Inliner]: procedures = 271, calls = 40, calls flagged for inlining = 6, calls inlined = 7, statements flattened = 339 [2023-08-31 20:59:23,437 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-08-31 20:59:23,437 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-08-31 20:59:23,438 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2023-08-31 20:59:23,438 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2023-08-31 20:59:23,482 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.08 08:59:23" (1/1) ... [2023-08-31 20:59:23,482 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.08 08:59:23" (1/1) ... [2023-08-31 20:59:23,496 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.08 08:59:23" (1/1) ... [2023-08-31 20:59:23,498 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.08 08:59:23" (1/1) ... [2023-08-31 20:59:23,509 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.08 08:59:23" (1/1) ... [2023-08-31 20:59:23,527 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.08 08:59:23" (1/1) ... [2023-08-31 20:59:23,529 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.08 08:59:23" (1/1) ... [2023-08-31 20:59:23,531 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.08 08:59:23" (1/1) ... [2023-08-31 20:59:23,536 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-08-31 20:59:23,539 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-08-31 20:59:23,539 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2023-08-31 20:59:23,539 INFO L275 PluginConnector]: RCFGBuilder initialized [2023-08-31 20:59:23,540 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.08 08:59:23" (1/1) ... [2023-08-31 20:59:23,544 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-08-31 20:59:23,554 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-31 20:59:23,566 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-08-31 20:59:23,567 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-08-31 20:59:23,588 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-08-31 20:59:23,588 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-08-31 20:59:23,588 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-08-31 20:59:23,589 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-08-31 20:59:23,589 INFO L130 BoogieDeclarations]: Found specification of procedure #PthreadsMutexLock [2023-08-31 20:59:23,589 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-08-31 20:59:23,589 INFO L130 BoogieDeclarations]: Found specification of procedure t_fun [2023-08-31 20:59:23,589 INFO L138 BoogieDeclarations]: Found implementation of procedure t_fun [2023-08-31 20:59:23,589 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-08-31 20:59:23,589 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-08-31 20:59:23,589 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-08-31 20:59:23,591 WARN L210 CfgBuilder]: User set CodeBlockSize to SequenceOfStatements but program contains fork statements. Overwriting the user preferences and setting CodeBlockSize to OneNontrivialStatement [2023-08-31 20:59:23,728 INFO L236 CfgBuilder]: Building ICFG [2023-08-31 20:59:23,729 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-08-31 20:59:24,098 INFO L277 CfgBuilder]: Performing block encoding [2023-08-31 20:59:24,109 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-08-31 20:59:24,110 INFO L302 CfgBuilder]: Removed 35 assume(true) statements. [2023-08-31 20:59:24,112 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 31.08 08:59:24 BoogieIcfgContainer [2023-08-31 20:59:24,112 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-08-31 20:59:24,114 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-08-31 20:59:24,115 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2023-08-31 20:59:24,117 INFO L275 PluginConnector]: TraceAbstraction initialized [2023-08-31 20:59:24,117 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 31.08 08:59:22" (1/3) ... [2023-08-31 20:59:24,117 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@35c475ba and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 31.08 08:59:24, skipping insertion in model container [2023-08-31 20:59:24,117 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.08 08:59:23" (2/3) ... [2023-08-31 20:59:24,118 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@35c475ba and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 31.08 08:59:24, skipping insertion in model container [2023-08-31 20:59:24,118 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 31.08 08:59:24" (3/3) ... [2023-08-31 20:59:24,119 INFO L112 eAbstractionObserver]: Analyzing ICFG 28-race_reach_71-funloop_racing.i [2023-08-31 20:59:24,124 WARN L145 ceAbstractionStarter]: Switching off computation of Hoare annotation because input is a concurrent program [2023-08-31 20:59:24,130 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-08-31 20:59:24,131 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 16 error locations. [2023-08-31 20:59:24,131 INFO L515 ceAbstractionStarter]: Constructing petrified ICFG for 1 thread instances. [2023-08-31 20:59:24,203 INFO L144 ThreadInstanceAdder]: Constructed 1 joinOtherThreadTransitions. [2023-08-31 20:59:24,233 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 306 places, 348 transitions, 704 flow [2023-08-31 20:59:24,355 INFO L130 PetriNetUnfolder]: 73/552 cut-off events. [2023-08-31 20:59:24,356 INFO L131 PetriNetUnfolder]: For 1/1 co-relation queries the response was YES. [2023-08-31 20:59:24,364 INFO L83 FinitePrefix]: Finished finitePrefix Result has 558 conditions, 552 events. 73/552 cut-off events. For 1/1 co-relation queries the response was YES. Maximal size of possible extension queue 21. Compared 2937 event pairs, 0 based on Foata normal form. 0/449 useless extension candidates. Maximal degree in co-relation 311. Up to 8 conditions per place. [2023-08-31 20:59:24,364 INFO L82 GeneralOperation]: Start removeDead. Operand has 306 places, 348 transitions, 704 flow [2023-08-31 20:59:24,371 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 302 places, 343 transitions, 691 flow [2023-08-31 20:59:24,374 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-31 20:59:24,384 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 302 places, 343 transitions, 691 flow [2023-08-31 20:59:24,386 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 302 places, 343 transitions, 691 flow [2023-08-31 20:59:24,386 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 302 places, 343 transitions, 691 flow [2023-08-31 20:59:24,430 INFO L130 PetriNetUnfolder]: 72/547 cut-off events. [2023-08-31 20:59:24,430 INFO L131 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2023-08-31 20:59:24,433 INFO L83 FinitePrefix]: Finished finitePrefix Result has 552 conditions, 547 events. 72/547 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 21. Compared 2885 event pairs, 0 based on Foata normal form. 0/444 useless extension candidates. Maximal degree in co-relation 311. Up to 8 conditions per place. [2023-08-31 20:59:24,452 INFO L119 LiptonReduction]: Number of co-enabled transitions 42840 [2023-08-31 20:59:26,723 INFO L134 LiptonReduction]: Checked pairs total: 175750 [2023-08-31 20:59:26,723 INFO L136 LiptonReduction]: Total number of compositions: 190 [2023-08-31 20:59:26,732 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == InUseError ======== [2023-08-31 20:59:26,736 INFO L357 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=PETRI_NET, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mPorIndependenceSettings=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@27ec9a8f, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-31 20:59:26,736 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-08-31 20:59:26,739 INFO L130 PetriNetUnfolder]: 11/48 cut-off events. [2023-08-31 20:59:26,740 INFO L131 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2023-08-31 20:59:26,740 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-31 20:59:26,740 INFO L208 CegarLoopForPetriNet]: trace histogram [2, 1, 1, 1, 1, 1] [2023-08-31 20:59:26,740 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-08-31 20:59:26,743 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-31 20:59:26,743 INFO L85 PathProgramCache]: Analyzing trace with hash 575860885, now seen corresponding path program 1 times [2023-08-31 20:59:26,749 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-31 20:59:26,749 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2140471810] [2023-08-31 20:59:26,750 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-31 20:59:26,750 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-31 20:59:26,827 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-31 20:59:26,900 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-08-31 20:59:26,900 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-31 20:59:26,901 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2140471810] [2023-08-31 20:59:26,901 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2140471810] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-31 20:59:26,901 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-31 20:59:26,901 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-08-31 20:59:26,902 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2070727461] [2023-08-31 20:59:26,903 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-31 20:59:26,907 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-31 20:59:26,911 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-31 20:59:26,925 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-31 20:59:26,926 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-31 20:59:26,946 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 301 out of 538 [2023-08-31 20:59:26,950 INFO L100 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 156 places, 191 transitions, 387 flow. Second operand has 3 states, 3 states have (on average 302.6666666666667) internal successors, (908), 3 states have internal predecessors, (908), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-31 20:59:26,951 INFO L109 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-31 20:59:26,951 INFO L110 encePairwiseOnDemand]: Number of universal subtrahend loopers: 301 of 538 [2023-08-31 20:59:26,951 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-31 20:59:27,250 INFO L130 PetriNetUnfolder]: 821/2953 cut-off events. [2023-08-31 20:59:27,251 INFO L131 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2023-08-31 20:59:27,254 INFO L83 FinitePrefix]: Finished finitePrefix Result has 4484 conditions, 2953 events. 821/2953 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 84. Compared 24056 event pairs, 684 based on Foata normal form. 363/3027 useless extension candidates. Maximal degree in co-relation 4325. Up to 1525 conditions per place. [2023-08-31 20:59:27,256 INFO L137 encePairwiseOnDemand]: 503/538 looper letters, 25 selfloop transitions, 2 changer transitions 102/160 dead transitions. [2023-08-31 20:59:27,256 INFO L142 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 158 places, 160 transitions, 451 flow [2023-08-31 20:59:27,257 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-31 20:59:27,259 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-31 20:59:27,265 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 999 transitions. [2023-08-31 20:59:27,267 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.6189591078066915 [2023-08-31 20:59:27,267 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 999 transitions. [2023-08-31 20:59:27,267 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 999 transitions. [2023-08-31 20:59:27,269 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-31 20:59:27,271 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 999 transitions. [2023-08-31 20:59:27,274 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 333.0) internal successors, (999), 3 states have internal predecessors, (999), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-31 20:59:27,278 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 538.0) internal successors, (2152), 4 states have internal predecessors, (2152), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-31 20:59:27,279 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 538.0) internal successors, (2152), 4 states have internal predecessors, (2152), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-31 20:59:27,280 INFO L175 Difference]: Start difference. First operand has 156 places, 191 transitions, 387 flow. Second operand 3 states and 999 transitions. [2023-08-31 20:59:27,281 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 158 places, 160 transitions, 451 flow [2023-08-31 20:59:27,283 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 158 places, 160 transitions, 451 flow, removed 0 selfloop flow, removed 0 redundant places. [2023-08-31 20:59:27,284 INFO L231 Difference]: Finished difference. Result has 159 places, 58 transitions, 131 flow [2023-08-31 20:59:27,286 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=538, PETRI_DIFFERENCE_MINUEND_FLOW=323, PETRI_DIFFERENCE_MINUEND_PLACES=156, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=159, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=157, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=131, PETRI_PLACES=159, PETRI_TRANSITIONS=58} [2023-08-31 20:59:27,288 INFO L281 CegarLoopForPetriNet]: 156 programPoint places, 3 predicate places. [2023-08-31 20:59:27,288 INFO L495 AbstractCegarLoop]: Abstraction has has 159 places, 58 transitions, 131 flow [2023-08-31 20:59:27,289 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 302.6666666666667) internal successors, (908), 3 states have internal predecessors, (908), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-31 20:59:27,289 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-31 20:59:27,289 INFO L208 CegarLoopForPetriNet]: trace histogram [2, 1, 1, 1, 1, 1, 1] [2023-08-31 20:59:27,289 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-08-31 20:59:27,289 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-08-31 20:59:27,290 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-31 20:59:27,290 INFO L85 PathProgramCache]: Analyzing trace with hash 1950080012, now seen corresponding path program 1 times [2023-08-31 20:59:27,290 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-31 20:59:27,290 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [295791276] [2023-08-31 20:59:27,290 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-31 20:59:27,290 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-31 20:59:27,302 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-31 20:59:27,358 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-08-31 20:59:27,359 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-31 20:59:27,359 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [295791276] [2023-08-31 20:59:27,359 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [295791276] provided 0 perfect and 1 imperfect interpolant sequences [2023-08-31 20:59:27,359 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2024700871] [2023-08-31 20:59:27,359 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-31 20:59:27,360 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-31 20:59:27,360 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-31 20:59:27,362 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-08-31 20:59:27,403 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-08-31 20:59:27,427 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-31 20:59:27,428 INFO L263 TraceCheckSpWp]: Trace formula consists of 100 conjuncts, 3 conjunts are in the unsatisfiable core [2023-08-31 20:59:27,431 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2023-08-31 20:59:27,464 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-08-31 20:59:27,465 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2023-08-31 20:59:27,489 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-08-31 20:59:27,489 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2024700871] provided 0 perfect and 2 imperfect interpolant sequences [2023-08-31 20:59:27,489 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-08-31 20:59:27,489 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 6 [2023-08-31 20:59:27,490 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [328460233] [2023-08-31 20:59:27,491 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-08-31 20:59:27,491 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-08-31 20:59:27,491 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-31 20:59:27,491 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-08-31 20:59:27,492 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2023-08-31 20:59:27,505 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 300 out of 538 [2023-08-31 20:59:27,507 INFO L100 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 159 places, 58 transitions, 131 flow. Second operand has 7 states, 7 states have (on average 301.57142857142856) internal successors, (2111), 7 states have internal predecessors, (2111), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-31 20:59:27,507 INFO L109 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-31 20:59:27,507 INFO L110 encePairwiseOnDemand]: Number of universal subtrahend loopers: 300 of 538 [2023-08-31 20:59:27,507 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-31 20:59:27,596 INFO L130 PetriNetUnfolder]: 63/264 cut-off events. [2023-08-31 20:59:27,596 INFO L131 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2023-08-31 20:59:27,597 INFO L83 FinitePrefix]: Finished finitePrefix Result has 423 conditions, 264 events. 63/264 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 12. Compared 872 event pairs, 54 based on Foata normal form. 0/235 useless extension candidates. Maximal degree in co-relation 411. Up to 140 conditions per place. [2023-08-31 20:59:27,597 INFO L137 encePairwiseOnDemand]: 535/538 looper letters, 25 selfloop transitions, 5 changer transitions 0/61 dead transitions. [2023-08-31 20:59:27,597 INFO L142 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 65 places, 61 transitions, 203 flow [2023-08-31 20:59:27,598 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-08-31 20:59:27,598 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6 states. [2023-08-31 20:59:27,600 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6 states to 6 states and 1833 transitions. [2023-08-31 20:59:27,601 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.5678438661710037 [2023-08-31 20:59:27,601 INFO L72 ComplementDD]: Start complementDD. Operand 6 states and 1833 transitions. [2023-08-31 20:59:27,601 INFO L73 IsDeterministic]: Start isDeterministic. Operand 6 states and 1833 transitions. [2023-08-31 20:59:27,602 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-31 20:59:27,602 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 6 states and 1833 transitions. [2023-08-31 20:59:27,605 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 7 states, 6 states have (on average 305.5) internal successors, (1833), 6 states have internal predecessors, (1833), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-31 20:59:27,609 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 7 states, 7 states have (on average 538.0) internal successors, (3766), 7 states have internal predecessors, (3766), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-31 20:59:27,610 INFO L81 ComplementDD]: Finished complementDD. Result has 7 states, 7 states have (on average 538.0) internal successors, (3766), 7 states have internal predecessors, (3766), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-31 20:59:27,610 INFO L175 Difference]: Start difference. First operand has 159 places, 58 transitions, 131 flow. Second operand 6 states and 1833 transitions. [2023-08-31 20:59:27,610 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 65 places, 61 transitions, 203 flow [2023-08-31 20:59:27,611 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 64 places, 61 transitions, 199 flow, removed 1 selfloop flow, removed 1 redundant places. [2023-08-31 20:59:27,612 INFO L231 Difference]: Finished difference. Result has 67 places, 61 transitions, 163 flow [2023-08-31 20:59:27,612 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=538, PETRI_DIFFERENCE_MINUEND_FLOW=127, PETRI_DIFFERENCE_MINUEND_PLACES=59, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=58, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=3, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=55, PETRI_DIFFERENCE_SUBTRAHEND_STATES=6, PETRI_FLOW=163, PETRI_PLACES=67, PETRI_TRANSITIONS=61} [2023-08-31 20:59:27,613 INFO L281 CegarLoopForPetriNet]: 156 programPoint places, -89 predicate places. [2023-08-31 20:59:27,613 INFO L495 AbstractCegarLoop]: Abstraction has has 67 places, 61 transitions, 163 flow [2023-08-31 20:59:27,614 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 301.57142857142856) internal successors, (2111), 7 states have internal predecessors, (2111), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-31 20:59:27,614 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-31 20:59:27,614 INFO L208 CegarLoopForPetriNet]: trace histogram [4, 2, 1, 1, 1, 1, 1] [2023-08-31 20:59:27,623 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-08-31 20:59:27,819 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-31 20:59:27,819 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-08-31 20:59:27,820 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-31 20:59:27,820 INFO L85 PathProgramCache]: Analyzing trace with hash -890399147, now seen corresponding path program 2 times [2023-08-31 20:59:27,820 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-31 20:59:27,820 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [671534360] [2023-08-31 20:59:27,820 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-31 20:59:27,821 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-31 20:59:27,844 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-31 20:59:27,917 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-08-31 20:59:27,918 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-31 20:59:27,918 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [671534360] [2023-08-31 20:59:27,919 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [671534360] provided 0 perfect and 1 imperfect interpolant sequences [2023-08-31 20:59:27,920 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [120717513] [2023-08-31 20:59:27,920 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2023-08-31 20:59:27,920 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-31 20:59:27,920 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-31 20:59:27,921 INFO L229 MonitoredProcess]: Starting monitored process 3 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-08-31 20:59:27,923 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-08-31 20:59:27,987 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2023-08-31 20:59:27,987 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-08-31 20:59:27,988 INFO L263 TraceCheckSpWp]: Trace formula consists of 121 conjuncts, 6 conjunts are in the unsatisfiable core [2023-08-31 20:59:27,989 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2023-08-31 20:59:28,005 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-08-31 20:59:28,006 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2023-08-31 20:59:28,049 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-08-31 20:59:28,049 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [120717513] provided 0 perfect and 2 imperfect interpolant sequences [2023-08-31 20:59:28,049 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-08-31 20:59:28,049 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 12 [2023-08-31 20:59:28,050 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [739243351] [2023-08-31 20:59:28,050 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-08-31 20:59:28,051 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2023-08-31 20:59:28,051 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-31 20:59:28,051 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2023-08-31 20:59:28,052 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=78, Unknown=0, NotChecked=0, Total=156 [2023-08-31 20:59:28,079 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 300 out of 538 [2023-08-31 20:59:28,091 INFO L100 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 67 places, 61 transitions, 163 flow. Second operand has 13 states, 13 states have (on average 301.3076923076923) internal successors, (3917), 13 states have internal predecessors, (3917), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-31 20:59:28,091 INFO L109 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-31 20:59:28,091 INFO L110 encePairwiseOnDemand]: Number of universal subtrahend loopers: 300 of 538 [2023-08-31 20:59:28,091 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-31 20:59:28,166 INFO L130 PetriNetUnfolder]: 63/270 cut-off events. [2023-08-31 20:59:28,167 INFO L131 PetriNetUnfolder]: For 20/20 co-relation queries the response was YES. [2023-08-31 20:59:28,167 INFO L83 FinitePrefix]: Finished finitePrefix Result has 460 conditions, 270 events. 63/270 cut-off events. For 20/20 co-relation queries the response was YES. Maximal size of possible extension queue 13. Compared 877 event pairs, 54 based on Foata normal form. 6/248 useless extension candidates. Maximal degree in co-relation 402. Up to 140 conditions per place. [2023-08-31 20:59:28,168 INFO L137 encePairwiseOnDemand]: 535/538 looper letters, 25 selfloop transitions, 11 changer transitions 0/67 dead transitions. [2023-08-31 20:59:28,168 INFO L142 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 78 places, 67 transitions, 271 flow [2023-08-31 20:59:28,168 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2023-08-31 20:59:28,168 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2023-08-31 20:59:28,172 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 3642 transitions. [2023-08-31 20:59:28,173 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.5641263940520446 [2023-08-31 20:59:28,173 INFO L72 ComplementDD]: Start complementDD. Operand 12 states and 3642 transitions. [2023-08-31 20:59:28,173 INFO L73 IsDeterministic]: Start isDeterministic. Operand 12 states and 3642 transitions. [2023-08-31 20:59:28,175 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-31 20:59:28,175 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 12 states and 3642 transitions. [2023-08-31 20:59:28,180 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 13 states, 12 states have (on average 303.5) internal successors, (3642), 12 states have internal predecessors, (3642), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-31 20:59:28,187 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 13 states, 13 states have (on average 538.0) internal successors, (6994), 13 states have internal predecessors, (6994), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-31 20:59:28,189 INFO L81 ComplementDD]: Finished complementDD. Result has 13 states, 13 states have (on average 538.0) internal successors, (6994), 13 states have internal predecessors, (6994), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-31 20:59:28,189 INFO L175 Difference]: Start difference. First operand has 67 places, 61 transitions, 163 flow. Second operand 12 states and 3642 transitions. [2023-08-31 20:59:28,190 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 78 places, 67 transitions, 271 flow [2023-08-31 20:59:28,192 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 77 places, 67 transitions, 257 flow, removed 6 selfloop flow, removed 1 redundant places. [2023-08-31 20:59:28,193 INFO L231 Difference]: Finished difference. Result has 83 places, 67 transitions, 233 flow [2023-08-31 20:59:28,193 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=538, PETRI_DIFFERENCE_MINUEND_FLOW=149, PETRI_DIFFERENCE_MINUEND_PLACES=66, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=61, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=6, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=55, PETRI_DIFFERENCE_SUBTRAHEND_STATES=12, PETRI_FLOW=233, PETRI_PLACES=83, PETRI_TRANSITIONS=67} [2023-08-31 20:59:28,194 INFO L281 CegarLoopForPetriNet]: 156 programPoint places, -73 predicate places. [2023-08-31 20:59:28,194 INFO L495 AbstractCegarLoop]: Abstraction has has 83 places, 67 transitions, 233 flow [2023-08-31 20:59:28,195 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 301.3076923076923) internal successors, (3917), 13 states have internal predecessors, (3917), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-31 20:59:28,196 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-31 20:59:28,196 INFO L208 CegarLoopForPetriNet]: trace histogram [10, 2, 1, 1, 1, 1, 1] [2023-08-31 20:59:28,204 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-08-31 20:59:28,401 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2023-08-31 20:59:28,404 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-08-31 20:59:28,404 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-31 20:59:28,404 INFO L85 PathProgramCache]: Analyzing trace with hash -1443894539, now seen corresponding path program 3 times [2023-08-31 20:59:28,404 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-31 20:59:28,404 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [347016850] [2023-08-31 20:59:28,404 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-31 20:59:28,405 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-31 20:59:28,441 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-31 20:59:28,444 INFO L356 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2023-08-31 20:59:28,454 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-31 20:59:28,479 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2023-08-31 20:59:28,480 INFO L360 BasicCegarLoop]: Counterexample is feasible [2023-08-31 20:59:28,480 INFO L805 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (0 of 1 remaining) [2023-08-31 20:59:28,481 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2023-08-31 20:59:28,481 INFO L445 BasicCegarLoop]: Path program histogram: [3, 1] [2023-08-31 20:59:28,483 INFO L307 ceAbstractionStarter]: Result for error location InUseError was UNSAFE (1/2) [2023-08-31 20:59:28,483 WARN L233 ceAbstractionStarter]: 1 thread instances were not sufficient, I will increase this number and restart the analysis [2023-08-31 20:59:28,483 INFO L515 ceAbstractionStarter]: Constructing petrified ICFG for 2 thread instances. [2023-08-31 20:59:28,528 INFO L144 ThreadInstanceAdder]: Constructed 2 joinOtherThreadTransitions. [2023-08-31 20:59:28,534 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 397 places, 452 transitions, 922 flow [2023-08-31 20:59:28,621 INFO L130 PetriNetUnfolder]: 118/890 cut-off events. [2023-08-31 20:59:28,621 INFO L131 PetriNetUnfolder]: For 6/6 co-relation queries the response was YES. [2023-08-31 20:59:28,628 INFO L83 FinitePrefix]: Finished finitePrefix Result has 904 conditions, 890 events. 118/890 cut-off events. For 6/6 co-relation queries the response was YES. Maximal size of possible extension queue 29. Compared 5569 event pairs, 0 based on Foata normal form. 0/724 useless extension candidates. Maximal degree in co-relation 554. Up to 12 conditions per place. [2023-08-31 20:59:28,628 INFO L82 GeneralOperation]: Start removeDead. Operand has 397 places, 452 transitions, 922 flow [2023-08-31 20:59:28,633 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 397 places, 452 transitions, 922 flow [2023-08-31 20:59:28,633 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-31 20:59:28,633 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 397 places, 452 transitions, 922 flow [2023-08-31 20:59:28,634 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 397 places, 452 transitions, 922 flow [2023-08-31 20:59:28,634 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 397 places, 452 transitions, 922 flow [2023-08-31 20:59:28,740 INFO L130 PetriNetUnfolder]: 118/890 cut-off events. [2023-08-31 20:59:28,740 INFO L131 PetriNetUnfolder]: For 6/6 co-relation queries the response was YES. [2023-08-31 20:59:28,749 INFO L83 FinitePrefix]: Finished finitePrefix Result has 904 conditions, 890 events. 118/890 cut-off events. For 6/6 co-relation queries the response was YES. Maximal size of possible extension queue 29. Compared 5569 event pairs, 0 based on Foata normal form. 0/724 useless extension candidates. Maximal degree in co-relation 554. Up to 12 conditions per place. [2023-08-31 20:59:28,775 INFO L119 LiptonReduction]: Number of co-enabled transitions 108732 [2023-08-31 20:59:31,572 INFO L134 LiptonReduction]: Checked pairs total: 449366 [2023-08-31 20:59:31,573 INFO L136 LiptonReduction]: Total number of compositions: 248 [2023-08-31 20:59:31,574 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == InUseError ======== [2023-08-31 20:59:31,575 INFO L357 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=PETRI_NET, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mPorIndependenceSettings=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@27ec9a8f, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-31 20:59:31,575 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-08-31 20:59:31,581 INFO L130 PetriNetUnfolder]: 37/168 cut-off events. [2023-08-31 20:59:31,581 INFO L131 PetriNetUnfolder]: For 2/2 co-relation queries the response was YES. [2023-08-31 20:59:31,581 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-31 20:59:31,581 INFO L208 CegarLoopForPetriNet]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1] [2023-08-31 20:59:31,581 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-08-31 20:59:31,582 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-31 20:59:31,582 INFO L85 PathProgramCache]: Analyzing trace with hash -2056818801, now seen corresponding path program 1 times [2023-08-31 20:59:31,582 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-31 20:59:31,582 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [600727541] [2023-08-31 20:59:31,582 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-31 20:59:31,582 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-31 20:59:31,589 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-31 20:59:31,600 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-08-31 20:59:31,601 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-31 20:59:31,601 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [600727541] [2023-08-31 20:59:31,601 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [600727541] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-31 20:59:31,601 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-31 20:59:31,601 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-08-31 20:59:31,601 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1055710659] [2023-08-31 20:59:31,602 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-31 20:59:31,602 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-31 20:59:31,602 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-31 20:59:31,602 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-31 20:59:31,602 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-31 20:59:31,609 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 390 out of 700 [2023-08-31 20:59:31,610 INFO L100 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 209 places, 256 transitions, 530 flow. Second operand has 3 states, 3 states have (on average 392.0) internal successors, (1176), 3 states have internal predecessors, (1176), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-31 20:59:31,610 INFO L109 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-31 20:59:31,610 INFO L110 encePairwiseOnDemand]: Number of universal subtrahend loopers: 390 of 700 [2023-08-31 20:59:31,610 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-31 20:59:36,027 INFO L130 PetriNetUnfolder]: 31210/71188 cut-off events. [2023-08-31 20:59:36,027 INFO L131 PetriNetUnfolder]: For 185/185 co-relation queries the response was YES. [2023-08-31 20:59:36,127 INFO L83 FinitePrefix]: Finished finitePrefix Result has 115304 conditions, 71188 events. 31210/71188 cut-off events. For 185/185 co-relation queries the response was YES. Maximal size of possible extension queue 1696. Compared 821390 event pairs, 27108 based on Foata normal form. 8997/72717 useless extension candidates. Maximal degree in co-relation 51424. Up to 43993 conditions per place. [2023-08-31 20:59:36,178 INFO L137 encePairwiseOnDemand]: 655/700 looper letters, 45 selfloop transitions, 2 changer transitions 106/215 dead transitions. [2023-08-31 20:59:36,179 INFO L142 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 211 places, 215 transitions, 620 flow [2023-08-31 20:59:36,179 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-31 20:59:36,179 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-31 20:59:36,181 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 1299 transitions. [2023-08-31 20:59:36,182 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.6185714285714285 [2023-08-31 20:59:36,182 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 1299 transitions. [2023-08-31 20:59:36,182 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 1299 transitions. [2023-08-31 20:59:36,182 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-31 20:59:36,182 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 1299 transitions. [2023-08-31 20:59:36,184 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 433.0) internal successors, (1299), 3 states have internal predecessors, (1299), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-31 20:59:36,186 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 700.0) internal successors, (2800), 4 states have internal predecessors, (2800), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-31 20:59:36,187 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 700.0) internal successors, (2800), 4 states have internal predecessors, (2800), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-31 20:59:36,187 INFO L175 Difference]: Start difference. First operand has 209 places, 256 transitions, 530 flow. Second operand 3 states and 1299 transitions. [2023-08-31 20:59:36,187 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 211 places, 215 transitions, 620 flow [2023-08-31 20:59:36,189 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 211 places, 215 transitions, 620 flow, removed 0 selfloop flow, removed 0 redundant places. [2023-08-31 20:59:36,190 INFO L231 Difference]: Finished difference. Result has 212 places, 109 transitions, 240 flow [2023-08-31 20:59:36,191 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=700, PETRI_DIFFERENCE_MINUEND_FLOW=446, PETRI_DIFFERENCE_MINUEND_PLACES=209, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=214, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=212, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=240, PETRI_PLACES=212, PETRI_TRANSITIONS=109} [2023-08-31 20:59:36,191 INFO L281 CegarLoopForPetriNet]: 209 programPoint places, 3 predicate places. [2023-08-31 20:59:36,191 INFO L495 AbstractCegarLoop]: Abstraction has has 212 places, 109 transitions, 240 flow [2023-08-31 20:59:36,192 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 392.0) internal successors, (1176), 3 states have internal predecessors, (1176), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-31 20:59:36,192 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-31 20:59:36,192 INFO L208 CegarLoopForPetriNet]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1] [2023-08-31 20:59:36,192 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2023-08-31 20:59:36,192 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-08-31 20:59:36,192 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-31 20:59:36,193 INFO L85 PathProgramCache]: Analyzing trace with hash 967596660, now seen corresponding path program 1 times [2023-08-31 20:59:36,193 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-31 20:59:36,193 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1248743002] [2023-08-31 20:59:36,193 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-31 20:59:36,193 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-31 20:59:36,201 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-31 20:59:36,227 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-08-31 20:59:36,227 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-31 20:59:36,228 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1248743002] [2023-08-31 20:59:36,228 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1248743002] provided 0 perfect and 1 imperfect interpolant sequences [2023-08-31 20:59:36,230 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [705072424] [2023-08-31 20:59:36,230 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-31 20:59:36,230 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-31 20:59:36,230 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-31 20:59:36,231 INFO L229 MonitoredProcess]: Starting monitored process 4 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-08-31 20:59:36,233 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-08-31 20:59:36,292 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-31 20:59:36,293 INFO L263 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 3 conjunts are in the unsatisfiable core [2023-08-31 20:59:36,293 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2023-08-31 20:59:36,301 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-08-31 20:59:36,301 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2023-08-31 20:59:36,313 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-08-31 20:59:36,313 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [705072424] provided 0 perfect and 2 imperfect interpolant sequences [2023-08-31 20:59:36,314 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-08-31 20:59:36,314 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 6 [2023-08-31 20:59:36,314 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1445763136] [2023-08-31 20:59:36,314 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-08-31 20:59:36,314 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-08-31 20:59:36,314 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-31 20:59:36,314 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-08-31 20:59:36,315 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2023-08-31 20:59:36,332 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 389 out of 700 [2023-08-31 20:59:36,334 INFO L100 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 212 places, 109 transitions, 240 flow. Second operand has 7 states, 7 states have (on average 390.7142857142857) internal successors, (2735), 7 states have internal predecessors, (2735), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-31 20:59:36,334 INFO L109 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-31 20:59:36,334 INFO L110 encePairwiseOnDemand]: Number of universal subtrahend loopers: 389 of 700 [2023-08-31 20:59:36,334 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-31 20:59:36,679 INFO L130 PetriNetUnfolder]: 2757/6754 cut-off events. [2023-08-31 20:59:36,680 INFO L131 PetriNetUnfolder]: For 65/65 co-relation queries the response was YES. [2023-08-31 20:59:36,689 INFO L83 FinitePrefix]: Finished finitePrefix Result has 10980 conditions, 6754 events. 2757/6754 cut-off events. For 65/65 co-relation queries the response was YES. Maximal size of possible extension queue 164. Compared 54807 event pairs, 2448 based on Foata normal form. 0/5889 useless extension candidates. Maximal degree in co-relation 10967. Up to 4130 conditions per place. [2023-08-31 20:59:36,821 INFO L137 encePairwiseOnDemand]: 697/700 looper letters, 45 selfloop transitions, 5 changer transitions 0/112 dead transitions. [2023-08-31 20:59:36,823 INFO L142 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 116 places, 112 transitions, 352 flow [2023-08-31 20:59:36,823 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-08-31 20:59:36,823 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6 states. [2023-08-31 20:59:36,826 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6 states to 6 states and 2387 transitions. [2023-08-31 20:59:36,827 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.5683333333333334 [2023-08-31 20:59:36,827 INFO L72 ComplementDD]: Start complementDD. Operand 6 states and 2387 transitions. [2023-08-31 20:59:36,827 INFO L73 IsDeterministic]: Start isDeterministic. Operand 6 states and 2387 transitions. [2023-08-31 20:59:36,828 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-31 20:59:36,828 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 6 states and 2387 transitions. [2023-08-31 20:59:36,831 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 7 states, 6 states have (on average 397.8333333333333) internal successors, (2387), 6 states have internal predecessors, (2387), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-31 20:59:36,835 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 7 states, 7 states have (on average 700.0) internal successors, (4900), 7 states have internal predecessors, (4900), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-31 20:59:36,836 INFO L81 ComplementDD]: Finished complementDD. Result has 7 states, 7 states have (on average 700.0) internal successors, (4900), 7 states have internal predecessors, (4900), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-31 20:59:36,836 INFO L175 Difference]: Start difference. First operand has 212 places, 109 transitions, 240 flow. Second operand 6 states and 2387 transitions. [2023-08-31 20:59:36,836 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 116 places, 112 transitions, 352 flow [2023-08-31 20:59:36,837 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 115 places, 112 transitions, 346 flow, removed 2 selfloop flow, removed 1 redundant places. [2023-08-31 20:59:36,838 INFO L231 Difference]: Finished difference. Result has 118 places, 112 transitions, 270 flow [2023-08-31 20:59:36,838 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=700, PETRI_DIFFERENCE_MINUEND_FLOW=234, PETRI_DIFFERENCE_MINUEND_PLACES=110, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=109, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=3, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=106, PETRI_DIFFERENCE_SUBTRAHEND_STATES=6, PETRI_FLOW=270, PETRI_PLACES=118, PETRI_TRANSITIONS=112} [2023-08-31 20:59:36,839 INFO L281 CegarLoopForPetriNet]: 209 programPoint places, -91 predicate places. [2023-08-31 20:59:36,839 INFO L495 AbstractCegarLoop]: Abstraction has has 118 places, 112 transitions, 270 flow [2023-08-31 20:59:36,840 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 390.7142857142857) internal successors, (2735), 7 states have internal predecessors, (2735), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-31 20:59:36,840 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-31 20:59:36,840 INFO L208 CegarLoopForPetriNet]: trace histogram [4, 3, 2, 2, 1, 1, 1, 1, 1] [2023-08-31 20:59:36,848 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-08-31 20:59:37,044 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-31 20:59:37,044 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-08-31 20:59:37,044 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-31 20:59:37,045 INFO L85 PathProgramCache]: Analyzing trace with hash -457342769, now seen corresponding path program 2 times [2023-08-31 20:59:37,045 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-31 20:59:37,045 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1913931189] [2023-08-31 20:59:37,045 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-31 20:59:37,045 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-31 20:59:37,053 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-31 20:59:37,088 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-08-31 20:59:37,089 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-31 20:59:37,089 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1913931189] [2023-08-31 20:59:37,089 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1913931189] provided 0 perfect and 1 imperfect interpolant sequences [2023-08-31 20:59:37,089 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [341995258] [2023-08-31 20:59:37,089 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2023-08-31 20:59:37,089 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-31 20:59:37,089 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-31 20:59:37,090 INFO L229 MonitoredProcess]: Starting monitored process 5 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-08-31 20:59:37,092 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-08-31 20:59:37,156 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2023-08-31 20:59:37,156 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-08-31 20:59:37,156 INFO L263 TraceCheckSpWp]: Trace formula consists of 140 conjuncts, 6 conjunts are in the unsatisfiable core [2023-08-31 20:59:37,157 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2023-08-31 20:59:37,173 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-08-31 20:59:37,173 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2023-08-31 20:59:37,212 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-08-31 20:59:37,212 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [341995258] provided 0 perfect and 2 imperfect interpolant sequences [2023-08-31 20:59:37,212 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-08-31 20:59:37,212 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 12 [2023-08-31 20:59:37,212 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1062693024] [2023-08-31 20:59:37,213 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-08-31 20:59:37,213 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2023-08-31 20:59:37,213 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-31 20:59:37,214 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2023-08-31 20:59:37,214 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=78, Unknown=0, NotChecked=0, Total=156 [2023-08-31 20:59:37,242 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 389 out of 700 [2023-08-31 20:59:37,246 INFO L100 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 118 places, 112 transitions, 270 flow. Second operand has 13 states, 13 states have (on average 390.38461538461536) internal successors, (5075), 13 states have internal predecessors, (5075), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-31 20:59:37,246 INFO L109 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-31 20:59:37,246 INFO L110 encePairwiseOnDemand]: Number of universal subtrahend loopers: 389 of 700 [2023-08-31 20:59:37,246 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-31 20:59:37,630 INFO L130 PetriNetUnfolder]: 2757/6760 cut-off events. [2023-08-31 20:59:37,631 INFO L131 PetriNetUnfolder]: For 75/75 co-relation queries the response was YES. [2023-08-31 20:59:37,640 INFO L83 FinitePrefix]: Finished finitePrefix Result has 11007 conditions, 6760 events. 2757/6760 cut-off events. For 75/75 co-relation queries the response was YES. Maximal size of possible extension queue 164. Compared 54840 event pairs, 2448 based on Foata normal form. 6/5902 useless extension candidates. Maximal degree in co-relation 10948. Up to 4130 conditions per place. [2023-08-31 20:59:37,652 INFO L137 encePairwiseOnDemand]: 697/700 looper letters, 45 selfloop transitions, 11 changer transitions 0/118 dead transitions. [2023-08-31 20:59:37,652 INFO L142 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 129 places, 118 transitions, 418 flow [2023-08-31 20:59:37,653 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2023-08-31 20:59:37,653 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2023-08-31 20:59:37,658 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 4730 transitions. [2023-08-31 20:59:37,659 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.5630952380952381 [2023-08-31 20:59:37,660 INFO L72 ComplementDD]: Start complementDD. Operand 12 states and 4730 transitions. [2023-08-31 20:59:37,660 INFO L73 IsDeterministic]: Start isDeterministic. Operand 12 states and 4730 transitions. [2023-08-31 20:59:37,661 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-31 20:59:37,662 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 12 states and 4730 transitions. [2023-08-31 20:59:37,668 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 13 states, 12 states have (on average 394.1666666666667) internal successors, (4730), 12 states have internal predecessors, (4730), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-31 20:59:37,675 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 13 states, 13 states have (on average 700.0) internal successors, (9100), 13 states have internal predecessors, (9100), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-31 20:59:37,676 INFO L81 ComplementDD]: Finished complementDD. Result has 13 states, 13 states have (on average 700.0) internal successors, (9100), 13 states have internal predecessors, (9100), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-31 20:59:37,676 INFO L175 Difference]: Start difference. First operand has 118 places, 112 transitions, 270 flow. Second operand 12 states and 4730 transitions. [2023-08-31 20:59:37,676 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 129 places, 118 transitions, 418 flow [2023-08-31 20:59:37,677 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 128 places, 118 transitions, 404 flow, removed 6 selfloop flow, removed 1 redundant places. [2023-08-31 20:59:37,678 INFO L231 Difference]: Finished difference. Result has 134 places, 118 transitions, 340 flow [2023-08-31 20:59:37,679 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=700, PETRI_DIFFERENCE_MINUEND_FLOW=256, PETRI_DIFFERENCE_MINUEND_PLACES=117, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=112, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=6, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=106, PETRI_DIFFERENCE_SUBTRAHEND_STATES=12, PETRI_FLOW=340, PETRI_PLACES=134, PETRI_TRANSITIONS=118} [2023-08-31 20:59:37,679 INFO L281 CegarLoopForPetriNet]: 209 programPoint places, -75 predicate places. [2023-08-31 20:59:37,679 INFO L495 AbstractCegarLoop]: Abstraction has has 134 places, 118 transitions, 340 flow [2023-08-31 20:59:37,680 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 390.38461538461536) internal successors, (5075), 13 states have internal predecessors, (5075), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-31 20:59:37,680 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-31 20:59:37,680 INFO L208 CegarLoopForPetriNet]: trace histogram [10, 3, 2, 2, 1, 1, 1, 1, 1] [2023-08-31 20:59:37,692 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-08-31 20:59:37,884 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-31 20:59:37,884 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-08-31 20:59:37,885 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-31 20:59:37,885 INFO L85 PathProgramCache]: Analyzing trace with hash 2054139567, now seen corresponding path program 3 times [2023-08-31 20:59:37,885 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-31 20:59:37,885 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1146252545] [2023-08-31 20:59:37,885 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-31 20:59:37,885 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-31 20:59:37,901 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-31 20:59:37,904 INFO L356 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2023-08-31 20:59:37,919 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-31 20:59:37,927 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2023-08-31 20:59:37,927 INFO L360 BasicCegarLoop]: Counterexample is feasible [2023-08-31 20:59:37,928 INFO L805 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (0 of 1 remaining) [2023-08-31 20:59:37,928 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2023-08-31 20:59:37,928 INFO L445 BasicCegarLoop]: Path program histogram: [3, 1] [2023-08-31 20:59:37,929 INFO L307 ceAbstractionStarter]: Result for error location InUseError was UNSAFE (1/2) [2023-08-31 20:59:37,929 WARN L233 ceAbstractionStarter]: 2 thread instances were not sufficient, I will increase this number and restart the analysis [2023-08-31 20:59:37,929 INFO L515 ceAbstractionStarter]: Constructing petrified ICFG for 3 thread instances. [2023-08-31 20:59:37,962 INFO L144 ThreadInstanceAdder]: Constructed 3 joinOtherThreadTransitions. [2023-08-31 20:59:37,965 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 488 places, 556 transitions, 1142 flow [2023-08-31 20:59:38,093 INFO L130 PetriNetUnfolder]: 168/1271 cut-off events. [2023-08-31 20:59:38,094 INFO L131 PetriNetUnfolder]: For 19/19 co-relation queries the response was YES. [2023-08-31 20:59:38,115 INFO L83 FinitePrefix]: Finished finitePrefix Result has 1299 conditions, 1271 events. 168/1271 cut-off events. For 19/19 co-relation queries the response was YES. Maximal size of possible extension queue 33. Compared 8444 event pairs, 1 based on Foata normal form. 0/1036 useless extension candidates. Maximal degree in co-relation 898. Up to 16 conditions per place. [2023-08-31 20:59:38,115 INFO L82 GeneralOperation]: Start removeDead. Operand has 488 places, 556 transitions, 1142 flow [2023-08-31 20:59:38,124 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 488 places, 556 transitions, 1142 flow [2023-08-31 20:59:38,125 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-31 20:59:38,125 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 488 places, 556 transitions, 1142 flow [2023-08-31 20:59:38,125 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 488 places, 556 transitions, 1142 flow [2023-08-31 20:59:38,125 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 488 places, 556 transitions, 1142 flow [2023-08-31 20:59:38,350 INFO L130 PetriNetUnfolder]: 168/1271 cut-off events. [2023-08-31 20:59:38,351 INFO L131 PetriNetUnfolder]: For 19/19 co-relation queries the response was YES. [2023-08-31 20:59:38,369 INFO L83 FinitePrefix]: Finished finitePrefix Result has 1299 conditions, 1271 events. 168/1271 cut-off events. For 19/19 co-relation queries the response was YES. Maximal size of possible extension queue 33. Compared 8444 event pairs, 1 based on Foata normal form. 0/1036 useless extension candidates. Maximal degree in co-relation 898. Up to 16 conditions per place. [2023-08-31 20:59:38,427 INFO L119 LiptonReduction]: Number of co-enabled transitions 195228 [2023-08-31 20:59:41,562 INFO L134 LiptonReduction]: Checked pairs total: 807335 [2023-08-31 20:59:41,562 INFO L136 LiptonReduction]: Total number of compositions: 299 [2023-08-31 20:59:41,563 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == InUseError ======== [2023-08-31 20:59:41,564 INFO L357 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=PETRI_NET, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mPorIndependenceSettings=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@27ec9a8f, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-31 20:59:41,564 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-08-31 20:59:41,579 INFO L130 PetriNetUnfolder]: 61/309 cut-off events. [2023-08-31 20:59:41,579 INFO L131 PetriNetUnfolder]: For 8/8 co-relation queries the response was YES. [2023-08-31 20:59:41,579 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-31 20:59:41,579 INFO L208 CegarLoopForPetriNet]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1] [2023-08-31 20:59:41,580 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-08-31 20:59:41,580 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-31 20:59:41,580 INFO L85 PathProgramCache]: Analyzing trace with hash 1398383858, now seen corresponding path program 1 times [2023-08-31 20:59:41,580 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-31 20:59:41,580 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1857741374] [2023-08-31 20:59:41,580 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-31 20:59:41,581 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-31 20:59:41,586 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-31 20:59:41,598 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2023-08-31 20:59:41,599 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-31 20:59:41,599 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1857741374] [2023-08-31 20:59:41,599 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1857741374] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-31 20:59:41,599 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-31 20:59:41,599 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-08-31 20:59:41,599 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [346182042] [2023-08-31 20:59:41,599 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-31 20:59:41,600 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-31 20:59:41,600 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-31 20:59:41,600 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-31 20:59:41,600 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-31 20:59:41,607 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 479 out of 855 [2023-08-31 20:59:41,607 INFO L100 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 259 places, 316 transitions, 662 flow. Second operand has 3 states, 3 states have (on average 481.3333333333333) internal successors, (1444), 3 states have internal predecessors, (1444), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-31 20:59:41,608 INFO L109 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-31 20:59:41,608 INFO L110 encePairwiseOnDemand]: Number of universal subtrahend loopers: 479 of 855 [2023-08-31 20:59:41,608 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand