./Ultimate.py --spec ../../../trunk/examples/svcomp/properties/no-overflow.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 overflows 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-Overflow-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 ! overflow) ) --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 [2023-09-01 06:53:59,465 INFO L177 SettingsManager]: Resetting all preferences to default values... [2023-09-01 06:53:59,467 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2023-09-01 06:53:59,494 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2023-09-01 06:53:59,495 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2023-09-01 06:53:59,498 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2023-09-01 06:53:59,499 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2023-09-01 06:53:59,501 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2023-09-01 06:53:59,502 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2023-09-01 06:53:59,505 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2023-09-01 06:53:59,506 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2023-09-01 06:53:59,508 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2023-09-01 06:53:59,508 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2023-09-01 06:53:59,509 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2023-09-01 06:53:59,511 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2023-09-01 06:53:59,513 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2023-09-01 06:53:59,514 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2023-09-01 06:53:59,515 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2023-09-01 06:53:59,516 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2023-09-01 06:53:59,523 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2023-09-01 06:53:59,525 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2023-09-01 06:53:59,525 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2023-09-01 06:53:59,526 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2023-09-01 06:53:59,527 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2023-09-01 06:53:59,532 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2023-09-01 06:53:59,533 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2023-09-01 06:53:59,533 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2023-09-01 06:53:59,535 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2023-09-01 06:53:59,535 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2023-09-01 06:53:59,535 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2023-09-01 06:53:59,536 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2023-09-01 06:53:59,539 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2023-09-01 06:53:59,540 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2023-09-01 06:53:59,541 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2023-09-01 06:53:59,542 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2023-09-01 06:53:59,543 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2023-09-01 06:53:59,543 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2023-09-01 06:53:59,543 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2023-09-01 06:53:59,544 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2023-09-01 06:53:59,544 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2023-09-01 06:53:59,545 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2023-09-01 06:53:59,546 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Overflow-32bit-Automizer_Default.epf [2023-09-01 06:53:59,574 INFO L113 SettingsManager]: Loading preferences was successful [2023-09-01 06:53:59,574 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2023-09-01 06:53:59,575 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-09-01 06:53:59,575 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-09-01 06:53:59,576 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-09-01 06:53:59,576 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-09-01 06:53:59,576 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2023-09-01 06:53:59,576 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2023-09-01 06:53:59,577 INFO L138 SettingsManager]: * Use SBE=true [2023-09-01 06:53:59,577 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-09-01 06:53:59,577 INFO L138 SettingsManager]: * sizeof long=4 [2023-09-01 06:53:59,577 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2023-09-01 06:53:59,578 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2023-09-01 06:53:59,578 INFO L138 SettingsManager]: * sizeof POINTER=4 [2023-09-01 06:53:59,578 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2023-09-01 06:53:59,578 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-09-01 06:53:59,578 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-09-01 06:53:59,578 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-09-01 06:53:59,579 INFO L138 SettingsManager]: * Check absence of signed integer overflows=true [2023-09-01 06:53:59,579 INFO L138 SettingsManager]: * sizeof long double=12 [2023-09-01 06:53:59,579 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2023-09-01 06:53:59,579 INFO L138 SettingsManager]: * Use constant arrays=true [2023-09-01 06:53:59,579 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-09-01 06:53:59,579 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-09-01 06:53:59,579 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2023-09-01 06:53:59,580 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2023-09-01 06:53:59,580 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-09-01 06:53:59,580 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-09-01 06:53:59,580 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-09-01 06:53:59,580 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2023-09-01 06:53:59,580 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2023-09-01 06:53:59,581 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-09-01 06:53:59,581 INFO L138 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2023-09-01 06:53:59,581 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-09-01 06:53:59,581 INFO L138 SettingsManager]: * Order on configurations for Petri net unfoldings=DBO [2023-09-01 06:53:59,581 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-09-01 06:53:59,581 INFO L138 SettingsManager]: * Independence relation used for large block encoding in concurrent analysis=SYNTACTIC [2023-09-01 06:53:59,582 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! overflow) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> bde6fe221f69c3fccb0f7c90e011f0b13ab5ca582ddcd328a459cbb512a8fd7f Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: When to check the insufficient erros location relative to the other error locations -> BEFORE [2023-09-01 06:53:59,806 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-09-01 06:53:59,818 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-09-01 06:53:59,819 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-09-01 06:53:59,820 INFO L271 PluginConnector]: Initializing CDTParser... [2023-09-01 06:53:59,820 INFO L275 PluginConnector]: CDTParser initialized [2023-09-01 06:53:59,821 INFO L432 ainManager$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 [2023-09-01 06:54:00,806 INFO L500 CDTParser]: Created temporary CDT project at NULL [2023-09-01 06:54:01,023 INFO L351 CDTParser]: Found 1 translation units. [2023-09-01 06:54:01,024 INFO L172 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/goblint-regression/28-race_reach_71-funloop_racing.i [2023-09-01 06:54:01,036 INFO L394 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/b4cbf9c41/12910ceb77bb4428b8cbd4dcd3d18c60/FLAG756a02a6e [2023-09-01 06:54:01,045 INFO L402 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/b4cbf9c41/12910ceb77bb4428b8cbd4dcd3d18c60 [2023-09-01 06:54:01,047 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-09-01 06:54:01,048 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2023-09-01 06:54:01,048 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-09-01 06:54:01,048 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-09-01 06:54:01,050 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2023-09-01 06:54:01,051 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 01.09 06:54:01" (1/1) ... [2023-09-01 06:54:01,052 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@33bd62c7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.09 06:54:01, skipping insertion in model container [2023-09-01 06:54:01,052 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 01.09 06:54:01" (1/1) ... [2023-09-01 06:54:01,056 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2023-09-01 06:54:01,086 INFO L178 MainTranslator]: Built tables and reachable declarations [2023-09-01 06:54:01,321 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] [2023-09-01 06:54:01,342 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-09-01 06:54:01,353 INFO L203 MainTranslator]: Completed pre-run [2023-09-01 06:54:01,389 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] [2023-09-01 06:54:01,400 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-09-01 06:54:01,452 INFO L208 MainTranslator]: Completed translation [2023-09-01 06:54:01,452 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.09 06:54:01 WrapperNode [2023-09-01 06:54:01,452 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-09-01 06:54:01,453 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-09-01 06:54:01,453 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-09-01 06:54:01,453 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2023-09-01 06:54:01,458 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.09 06:54:01" (1/1) ... [2023-09-01 06:54:01,474 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.09 06:54:01" (1/1) ... [2023-09-01 06:54:01,498 INFO L138 Inliner]: procedures = 271, calls = 40, calls flagged for inlining = 6, calls inlined = 7, statements flattened = 269 [2023-09-01 06:54:01,498 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-09-01 06:54:01,499 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-09-01 06:54:01,499 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2023-09-01 06:54:01,499 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2023-09-01 06:54:01,505 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.09 06:54:01" (1/1) ... [2023-09-01 06:54:01,505 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.09 06:54:01" (1/1) ... [2023-09-01 06:54:01,508 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.09 06:54:01" (1/1) ... [2023-09-01 06:54:01,508 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.09 06:54:01" (1/1) ... [2023-09-01 06:54:01,514 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.09 06:54:01" (1/1) ... [2023-09-01 06:54:01,518 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.09 06:54:01" (1/1) ... [2023-09-01 06:54:01,524 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.09 06:54:01" (1/1) ... [2023-09-01 06:54:01,525 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.09 06:54:01" (1/1) ... [2023-09-01 06:54:01,531 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-09-01 06:54:01,532 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-09-01 06:54:01,532 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2023-09-01 06:54:01,532 INFO L275 PluginConnector]: RCFGBuilder initialized [2023-09-01 06:54:01,533 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.09 06:54:01" (1/1) ... [2023-09-01 06:54:01,539 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-09-01 06:54:01,548 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-09-01 06:54:01,560 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) [2023-09-01 06:54:01,566 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 [2023-09-01 06:54:01,589 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-09-01 06:54:01,590 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-09-01 06:54:01,592 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-09-01 06:54:01,592 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-09-01 06:54:01,593 INFO L130 BoogieDeclarations]: Found specification of procedure #PthreadsMutexLock [2023-09-01 06:54:01,593 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-09-01 06:54:01,593 INFO L130 BoogieDeclarations]: Found specification of procedure t_fun [2023-09-01 06:54:01,593 INFO L138 BoogieDeclarations]: Found implementation of procedure t_fun [2023-09-01 06:54:01,594 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-09-01 06:54:01,594 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-09-01 06:54:01,594 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-09-01 06:54:01,595 WARN L210 CfgBuilder]: User set CodeBlockSize to SequenceOfStatements but program contains fork statements. Overwriting the user preferences and setting CodeBlockSize to OneNontrivialStatement [2023-09-01 06:54:01,716 INFO L236 CfgBuilder]: Building ICFG [2023-09-01 06:54:01,717 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-09-01 06:54:02,065 INFO L277 CfgBuilder]: Performing block encoding [2023-09-01 06:54:02,077 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-09-01 06:54:02,078 INFO L302 CfgBuilder]: Removed 35 assume(true) statements. [2023-09-01 06:54:02,080 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 01.09 06:54:02 BoogieIcfgContainer [2023-09-01 06:54:02,080 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-09-01 06:54:02,082 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-09-01 06:54:02,082 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2023-09-01 06:54:02,084 INFO L275 PluginConnector]: TraceAbstraction initialized [2023-09-01 06:54:02,084 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 01.09 06:54:01" (1/3) ... [2023-09-01 06:54:02,084 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@48d1edc6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 01.09 06:54:02, skipping insertion in model container [2023-09-01 06:54:02,085 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.09 06:54:01" (2/3) ... [2023-09-01 06:54:02,085 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@48d1edc6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 01.09 06:54:02, skipping insertion in model container [2023-09-01 06:54:02,085 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 01.09 06:54:02" (3/3) ... [2023-09-01 06:54:02,086 INFO L112 eAbstractionObserver]: Analyzing ICFG 28-race_reach_71-funloop_racing.i [2023-09-01 06:54:02,091 WARN L145 ceAbstractionStarter]: Switching off computation of Hoare annotation because input is a concurrent program [2023-09-01 06:54:02,097 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-09-01 06:54:02,098 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 22 error locations. [2023-09-01 06:54:02,098 INFO L515 ceAbstractionStarter]: Constructing petrified ICFG for 1 thread instances. [2023-09-01 06:54:02,187 INFO L144 ThreadInstanceAdder]: Constructed 1 joinOtherThreadTransitions. [2023-09-01 06:54:02,221 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 242 places, 284 transitions, 576 flow [2023-09-01 06:54:02,335 INFO L130 PetriNetUnfolder]: 73/434 cut-off events. [2023-09-01 06:54:02,336 INFO L131 PetriNetUnfolder]: For 1/1 co-relation queries the response was YES. [2023-09-01 06:54:02,343 INFO L83 FinitePrefix]: Finished finitePrefix Result has 440 conditions, 434 events. 73/434 cut-off events. For 1/1 co-relation queries the response was YES. Maximal size of possible extension queue 18. Compared 2040 event pairs, 0 based on Foata normal form. 0/326 useless extension candidates. Maximal degree in co-relation 239. Up to 8 conditions per place. [2023-09-01 06:54:02,344 INFO L82 GeneralOperation]: Start removeDead. Operand has 242 places, 284 transitions, 576 flow [2023-09-01 06:54:02,353 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 232 places, 273 transitions, 551 flow [2023-09-01 06:54:02,357 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-09-01 06:54:02,385 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 232 places, 273 transitions, 551 flow [2023-09-01 06:54:02,388 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 232 places, 273 transitions, 551 flow [2023-09-01 06:54:02,388 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 232 places, 273 transitions, 551 flow [2023-09-01 06:54:02,436 INFO L130 PetriNetUnfolder]: 72/423 cut-off events. [2023-09-01 06:54:02,436 INFO L131 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2023-09-01 06:54:02,441 INFO L83 FinitePrefix]: Finished finitePrefix Result has 428 conditions, 423 events. 72/423 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 17. Compared 1946 event pairs, 0 based on Foata normal form. 0/319 useless extension candidates. Maximal degree in co-relation 239. Up to 8 conditions per place. [2023-09-01 06:54:02,451 INFO L119 LiptonReduction]: Number of co-enabled transitions 25600 [2023-09-01 06:54:05,279 INFO L134 LiptonReduction]: Checked pairs total: 43561 [2023-09-01 06:54:05,279 INFO L136 LiptonReduction]: Total number of compositions: 230 [2023-09-01 06:54:05,289 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == InUseError ======== [2023-09-01 06:54:05,293 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;@1a7d48b0, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-09-01 06:54:05,294 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-09-01 06:54:05,298 INFO L130 PetriNetUnfolder]: 15/57 cut-off events. [2023-09-01 06:54:05,299 INFO L131 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2023-09-01 06:54:05,299 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-09-01 06:54:05,299 INFO L208 CegarLoopForPetriNet]: trace histogram [2, 1, 1, 1, 1, 1] [2023-09-01 06:54:05,299 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-09-01 06:54:05,302 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-09-01 06:54:05,302 INFO L85 PathProgramCache]: Analyzing trace with hash -967463292, now seen corresponding path program 1 times [2023-09-01 06:54:05,309 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-09-01 06:54:05,309 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [771828720] [2023-09-01 06:54:05,309 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-09-01 06:54:05,309 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-09-01 06:54:05,373 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-09-01 06:54:05,475 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-09-01 06:54:05,475 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-09-01 06:54:05,476 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [771828720] [2023-09-01 06:54:05,476 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [771828720] provided 1 perfect and 0 imperfect interpolant sequences [2023-09-01 06:54:05,476 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-09-01 06:54:05,476 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-09-01 06:54:05,477 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1628050472] [2023-09-01 06:54:05,477 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-09-01 06:54:05,485 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-09-01 06:54:05,494 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-09-01 06:54:05,509 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-09-01 06:54:05,510 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-09-01 06:54:05,529 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 237 out of 514 [2023-09-01 06:54:05,534 INFO L100 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 80 places, 114 transitions, 233 flow. Second operand has 3 states, 3 states have (on average 238.66666666666666) internal successors, (716), 3 states have internal predecessors, (716), 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) [2023-09-01 06:54:05,534 INFO L109 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-09-01 06:54:05,534 INFO L110 encePairwiseOnDemand]: Number of universal subtrahend loopers: 237 of 514 [2023-09-01 06:54:05,535 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-09-01 06:54:05,785 INFO L130 PetriNetUnfolder]: 1082/2229 cut-off events. [2023-09-01 06:54:05,785 INFO L131 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2023-09-01 06:54:05,787 INFO L83 FinitePrefix]: Finished finitePrefix Result has 4263 conditions, 2229 events. 1082/2229 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 139. Compared 14611 event pairs, 924 based on Foata normal form. 269/1798 useless extension candidates. Maximal degree in co-relation 4153. Up to 2027 conditions per place. [2023-09-01 06:54:05,790 INFO L137 encePairwiseOnDemand]: 480/514 looper letters, 30 selfloop transitions, 2 changer transitions 47/84 dead transitions. [2023-09-01 06:54:05,790 INFO L142 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 82 places, 84 transitions, 317 flow [2023-09-01 06:54:05,792 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-09-01 06:54:05,793 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-09-01 06:54:05,801 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 815 transitions. [2023-09-01 06:54:05,804 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.5285343709468223 [2023-09-01 06:54:05,804 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 815 transitions. [2023-09-01 06:54:05,805 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 815 transitions. [2023-09-01 06:54:05,806 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-09-01 06:54:05,808 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 815 transitions. [2023-09-01 06:54:05,812 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 271.6666666666667) internal successors, (815), 3 states have internal predecessors, (815), 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) [2023-09-01 06:54:05,817 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 514.0) internal successors, (2056), 4 states have internal predecessors, (2056), 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) [2023-09-01 06:54:05,819 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 514.0) internal successors, (2056), 4 states have internal predecessors, (2056), 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) [2023-09-01 06:54:05,820 INFO L175 Difference]: Start difference. First operand has 80 places, 114 transitions, 233 flow. Second operand 3 states and 815 transitions. [2023-09-01 06:54:05,821 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 82 places, 84 transitions, 317 flow [2023-09-01 06:54:05,824 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 82 places, 84 transitions, 317 flow, removed 0 selfloop flow, removed 0 redundant places. [2023-09-01 06:54:05,826 INFO L231 Difference]: Finished difference. Result has 83 places, 37 transitions, 89 flow [2023-09-01 06:54:05,828 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=514, PETRI_DIFFERENCE_MINUEND_FLOW=171, PETRI_DIFFERENCE_MINUEND_PLACES=80, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=83, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=81, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=89, PETRI_PLACES=83, PETRI_TRANSITIONS=37} [2023-09-01 06:54:05,831 INFO L281 CegarLoopForPetriNet]: 80 programPoint places, 3 predicate places. [2023-09-01 06:54:05,831 INFO L495 AbstractCegarLoop]: Abstraction has has 83 places, 37 transitions, 89 flow [2023-09-01 06:54:05,831 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 238.66666666666666) internal successors, (716), 3 states have internal predecessors, (716), 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) [2023-09-01 06:54:05,831 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-09-01 06:54:05,832 INFO L208 CegarLoopForPetriNet]: trace histogram [2, 1, 1, 1, 1, 1, 1] [2023-09-01 06:54:05,832 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-09-01 06:54:05,832 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-09-01 06:54:05,833 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-09-01 06:54:05,833 INFO L85 PathProgramCache]: Analyzing trace with hash -10805220, now seen corresponding path program 1 times [2023-09-01 06:54:05,833 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-09-01 06:54:05,833 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1256276965] [2023-09-01 06:54:05,833 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-09-01 06:54:05,834 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-09-01 06:54:05,849 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-09-01 06:54:05,900 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-09-01 06:54:05,900 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-09-01 06:54:05,900 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1256276965] [2023-09-01 06:54:05,900 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1256276965] provided 0 perfect and 1 imperfect interpolant sequences [2023-09-01 06:54:05,901 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [594146676] [2023-09-01 06:54:05,901 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-09-01 06:54:05,901 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-09-01 06:54:05,901 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-09-01 06:54:05,904 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) [2023-09-01 06:54:05,917 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-09-01 06:54:05,976 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-09-01 06:54:05,978 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 3 conjunts are in the unsatisfiable core [2023-09-01 06:54:05,981 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2023-09-01 06:54:06,035 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-09-01 06:54:06,036 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2023-09-01 06:54:06,048 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-09-01 06:54:06,048 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [594146676] provided 0 perfect and 2 imperfect interpolant sequences [2023-09-01 06:54:06,048 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-09-01 06:54:06,048 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 6 [2023-09-01 06:54:06,049 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1932223676] [2023-09-01 06:54:06,049 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-09-01 06:54:06,049 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-09-01 06:54:06,050 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-09-01 06:54:06,050 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-09-01 06:54:06,050 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2023-09-01 06:54:06,101 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 236 out of 514 [2023-09-01 06:54:06,103 INFO L100 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 83 places, 37 transitions, 89 flow. Second operand has 7 states, 7 states have (on average 237.57142857142858) internal successors, (1663), 7 states have internal predecessors, (1663), 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) [2023-09-01 06:54:06,103 INFO L109 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-09-01 06:54:06,103 INFO L110 encePairwiseOnDemand]: Number of universal subtrahend loopers: 236 of 514 [2023-09-01 06:54:06,103 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-09-01 06:54:06,180 INFO L130 PetriNetUnfolder]: 118/278 cut-off events. [2023-09-01 06:54:06,180 INFO L131 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2023-09-01 06:54:06,181 INFO L83 FinitePrefix]: Finished finitePrefix Result has 547 conditions, 278 events. 118/278 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 22. Compared 1074 event pairs, 105 based on Foata normal form. 0/168 useless extension candidates. Maximal degree in co-relation 535. Up to 249 conditions per place. [2023-09-01 06:54:06,182 INFO L137 encePairwiseOnDemand]: 511/514 looper letters, 30 selfloop transitions, 5 changer transitions 0/40 dead transitions. [2023-09-01 06:54:06,182 INFO L142 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 44 places, 40 transitions, 171 flow [2023-09-01 06:54:06,182 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-09-01 06:54:06,182 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6 states. [2023-09-01 06:54:06,184 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6 states to 6 states and 1454 transitions. [2023-09-01 06:54:06,185 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4714656290531777 [2023-09-01 06:54:06,185 INFO L72 ComplementDD]: Start complementDD. Operand 6 states and 1454 transitions. [2023-09-01 06:54:06,185 INFO L73 IsDeterministic]: Start isDeterministic. Operand 6 states and 1454 transitions. [2023-09-01 06:54:06,186 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-09-01 06:54:06,186 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 6 states and 1454 transitions. [2023-09-01 06:54:06,188 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 7 states, 6 states have (on average 242.33333333333334) internal successors, (1454), 6 states have internal predecessors, (1454), 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) [2023-09-01 06:54:06,192 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 7 states, 7 states have (on average 514.0) internal successors, (3598), 7 states have internal predecessors, (3598), 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) [2023-09-01 06:54:06,193 INFO L81 ComplementDD]: Finished complementDD. Result has 7 states, 7 states have (on average 514.0) internal successors, (3598), 7 states have internal predecessors, (3598), 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) [2023-09-01 06:54:06,193 INFO L175 Difference]: Start difference. First operand has 83 places, 37 transitions, 89 flow. Second operand 6 states and 1454 transitions. [2023-09-01 06:54:06,193 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 44 places, 40 transitions, 171 flow [2023-09-01 06:54:06,194 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 43 places, 40 transitions, 167 flow, removed 1 selfloop flow, removed 1 redundant places. [2023-09-01 06:54:06,195 INFO L231 Difference]: Finished difference. Result has 46 places, 40 transitions, 121 flow [2023-09-01 06:54:06,195 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=514, PETRI_DIFFERENCE_MINUEND_FLOW=85, PETRI_DIFFERENCE_MINUEND_PLACES=38, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=37, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=3, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=34, PETRI_DIFFERENCE_SUBTRAHEND_STATES=6, PETRI_FLOW=121, PETRI_PLACES=46, PETRI_TRANSITIONS=40} [2023-09-01 06:54:06,196 INFO L281 CegarLoopForPetriNet]: 80 programPoint places, -34 predicate places. [2023-09-01 06:54:06,196 INFO L495 AbstractCegarLoop]: Abstraction has has 46 places, 40 transitions, 121 flow [2023-09-01 06:54:06,197 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 237.57142857142858) internal successors, (1663), 7 states have internal predecessors, (1663), 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) [2023-09-01 06:54:06,197 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-09-01 06:54:06,198 INFO L208 CegarLoopForPetriNet]: trace histogram [4, 2, 1, 1, 1, 1, 1] [2023-09-01 06:54:06,207 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-09-01 06:54:06,402 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 [2023-09-01 06:54:06,402 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-09-01 06:54:06,403 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-09-01 06:54:06,403 INFO L85 PathProgramCache]: Analyzing trace with hash -1796123516, now seen corresponding path program 2 times [2023-09-01 06:54:06,403 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-09-01 06:54:06,403 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [793371924] [2023-09-01 06:54:06,404 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-09-01 06:54:06,404 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-09-01 06:54:06,419 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-09-01 06:54:06,521 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-09-01 06:54:06,521 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-09-01 06:54:06,521 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [793371924] [2023-09-01 06:54:06,522 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [793371924] provided 0 perfect and 1 imperfect interpolant sequences [2023-09-01 06:54:06,522 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2036784981] [2023-09-01 06:54:06,522 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2023-09-01 06:54:06,522 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-09-01 06:54:06,522 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-09-01 06:54:06,523 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) [2023-09-01 06:54:06,525 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-09-01 06:54:06,592 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2023-09-01 06:54:06,593 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-09-01 06:54:06,594 INFO L263 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 6 conjunts are in the unsatisfiable core [2023-09-01 06:54:06,594 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2023-09-01 06:54:06,617 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-09-01 06:54:06,618 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2023-09-01 06:54:06,652 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-09-01 06:54:06,653 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2036784981] provided 0 perfect and 2 imperfect interpolant sequences [2023-09-01 06:54:06,653 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-09-01 06:54:06,653 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 12 [2023-09-01 06:54:06,653 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [496416599] [2023-09-01 06:54:06,653 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-09-01 06:54:06,654 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2023-09-01 06:54:06,654 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-09-01 06:54:06,654 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2023-09-01 06:54:06,655 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=78, Unknown=0, NotChecked=0, Total=156 [2023-09-01 06:54:06,682 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 236 out of 514 [2023-09-01 06:54:06,685 INFO L100 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 46 places, 40 transitions, 121 flow. Second operand has 13 states, 13 states have (on average 237.30769230769232) internal successors, (3085), 13 states have internal predecessors, (3085), 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) [2023-09-01 06:54:06,686 INFO L109 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-09-01 06:54:06,686 INFO L110 encePairwiseOnDemand]: Number of universal subtrahend loopers: 236 of 514 [2023-09-01 06:54:06,686 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-09-01 06:54:06,749 INFO L130 PetriNetUnfolder]: 118/284 cut-off events. [2023-09-01 06:54:06,749 INFO L131 PetriNetUnfolder]: For 20/20 co-relation queries the response was YES. [2023-09-01 06:54:06,750 INFO L83 FinitePrefix]: Finished finitePrefix Result has 584 conditions, 284 events. 118/284 cut-off events. For 20/20 co-relation queries the response was YES. Maximal size of possible extension queue 22. Compared 1074 event pairs, 105 based on Foata normal form. 6/181 useless extension candidates. Maximal degree in co-relation 526. Up to 249 conditions per place. [2023-09-01 06:54:06,750 INFO L137 encePairwiseOnDemand]: 511/514 looper letters, 30 selfloop transitions, 11 changer transitions 0/46 dead transitions. [2023-09-01 06:54:06,750 INFO L142 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 57 places, 46 transitions, 239 flow [2023-09-01 06:54:06,751 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2023-09-01 06:54:06,751 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2023-09-01 06:54:06,754 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 2879 transitions. [2023-09-01 06:54:06,755 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4667639429312581 [2023-09-01 06:54:06,755 INFO L72 ComplementDD]: Start complementDD. Operand 12 states and 2879 transitions. [2023-09-01 06:54:06,755 INFO L73 IsDeterministic]: Start isDeterministic. Operand 12 states and 2879 transitions. [2023-09-01 06:54:06,756 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-09-01 06:54:06,756 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 12 states and 2879 transitions. [2023-09-01 06:54:06,761 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 13 states, 12 states have (on average 239.91666666666666) internal successors, (2879), 12 states have internal predecessors, (2879), 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) [2023-09-01 06:54:06,767 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 13 states, 13 states have (on average 514.0) internal successors, (6682), 13 states have internal predecessors, (6682), 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) [2023-09-01 06:54:06,770 INFO L81 ComplementDD]: Finished complementDD. Result has 13 states, 13 states have (on average 514.0) internal successors, (6682), 13 states have internal predecessors, (6682), 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) [2023-09-01 06:54:06,770 INFO L175 Difference]: Start difference. First operand has 46 places, 40 transitions, 121 flow. Second operand 12 states and 2879 transitions. [2023-09-01 06:54:06,771 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 57 places, 46 transitions, 239 flow [2023-09-01 06:54:06,772 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 56 places, 46 transitions, 225 flow, removed 6 selfloop flow, removed 1 redundant places. [2023-09-01 06:54:06,773 INFO L231 Difference]: Finished difference. Result has 62 places, 46 transitions, 191 flow [2023-09-01 06:54:06,773 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=514, PETRI_DIFFERENCE_MINUEND_FLOW=107, PETRI_DIFFERENCE_MINUEND_PLACES=45, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=40, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=6, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=34, PETRI_DIFFERENCE_SUBTRAHEND_STATES=12, PETRI_FLOW=191, PETRI_PLACES=62, PETRI_TRANSITIONS=46} [2023-09-01 06:54:06,774 INFO L281 CegarLoopForPetriNet]: 80 programPoint places, -18 predicate places. [2023-09-01 06:54:06,774 INFO L495 AbstractCegarLoop]: Abstraction has has 62 places, 46 transitions, 191 flow [2023-09-01 06:54:06,776 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 237.30769230769232) internal successors, (3085), 13 states have internal predecessors, (3085), 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) [2023-09-01 06:54:06,776 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-09-01 06:54:06,776 INFO L208 CegarLoopForPetriNet]: trace histogram [10, 2, 1, 1, 1, 1, 1] [2023-09-01 06:54:06,785 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-09-01 06:54:06,985 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 [2023-09-01 06:54:06,986 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-09-01 06:54:06,986 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-09-01 06:54:06,986 INFO L85 PathProgramCache]: Analyzing trace with hash -166384252, now seen corresponding path program 3 times [2023-09-01 06:54:06,986 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-09-01 06:54:06,986 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1479570091] [2023-09-01 06:54:06,987 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-09-01 06:54:06,987 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-09-01 06:54:07,010 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-09-01 06:54:07,011 INFO L356 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2023-09-01 06:54:07,028 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-09-01 06:54:07,043 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2023-09-01 06:54:07,043 INFO L360 BasicCegarLoop]: Counterexample is feasible [2023-09-01 06:54:07,044 INFO L805 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (0 of 1 remaining) [2023-09-01 06:54:07,045 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2023-09-01 06:54:07,045 INFO L445 BasicCegarLoop]: Path program histogram: [3, 1] [2023-09-01 06:54:07,047 INFO L307 ceAbstractionStarter]: Result for error location InUseError was UNSAFE (1/2) [2023-09-01 06:54:07,047 WARN L233 ceAbstractionStarter]: 1 thread instances were not sufficient, I will increase this number and restart the analysis [2023-09-01 06:54:07,047 INFO L515 ceAbstractionStarter]: Constructing petrified ICFG for 2 thread instances. [2023-09-01 06:54:07,068 INFO L144 ThreadInstanceAdder]: Constructed 2 joinOtherThreadTransitions. [2023-09-01 06:54:07,079 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 311 places, 366 transitions, 750 flow [2023-09-01 06:54:07,149 INFO L130 PetriNetUnfolder]: 118/702 cut-off events. [2023-09-01 06:54:07,150 INFO L131 PetriNetUnfolder]: For 6/6 co-relation queries the response was YES. [2023-09-01 06:54:07,157 INFO L83 FinitePrefix]: Finished finitePrefix Result has 716 conditions, 702 events. 118/702 cut-off events. For 6/6 co-relation queries the response was YES. Maximal size of possible extension queue 22. Compared 3747 event pairs, 0 based on Foata normal form. 0/526 useless extension candidates. Maximal degree in co-relation 436. Up to 12 conditions per place. [2023-09-01 06:54:07,157 INFO L82 GeneralOperation]: Start removeDead. Operand has 311 places, 366 transitions, 750 flow [2023-09-01 06:54:07,162 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 309 places, 364 transitions, 746 flow [2023-09-01 06:54:07,162 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-09-01 06:54:07,162 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 309 places, 364 transitions, 746 flow [2023-09-01 06:54:07,163 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 309 places, 364 transitions, 746 flow [2023-09-01 06:54:07,163 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 309 places, 364 transitions, 746 flow [2023-09-01 06:54:07,240 INFO L130 PetriNetUnfolder]: 118/700 cut-off events. [2023-09-01 06:54:07,240 INFO L131 PetriNetUnfolder]: For 6/6 co-relation queries the response was YES. [2023-09-01 06:54:07,244 INFO L83 FinitePrefix]: Finished finitePrefix Result has 714 conditions, 700 events. 118/700 cut-off events. For 6/6 co-relation queries the response was YES. Maximal size of possible extension queue 22. Compared 3751 event pairs, 0 based on Foata normal form. 0/526 useless extension candidates. Maximal degree in co-relation 434. Up to 12 conditions per place. [2023-09-01 06:54:07,263 INFO L119 LiptonReduction]: Number of co-enabled transitions 67040 [2023-09-01 06:54:10,467 INFO L134 LiptonReduction]: Checked pairs total: 107702 [2023-09-01 06:54:10,468 INFO L136 LiptonReduction]: Total number of compositions: 290 [2023-09-01 06:54:10,472 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == InUseError ======== [2023-09-01 06:54:10,473 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;@1a7d48b0, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-09-01 06:54:10,473 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-09-01 06:54:10,482 INFO L130 PetriNetUnfolder]: 53/180 cut-off events. [2023-09-01 06:54:10,483 INFO L131 PetriNetUnfolder]: For 3/3 co-relation queries the response was YES. [2023-09-01 06:54:10,483 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-09-01 06:54:10,483 INFO L208 CegarLoopForPetriNet]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1] [2023-09-01 06:54:10,484 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-09-01 06:54:10,484 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-09-01 06:54:10,484 INFO L85 PathProgramCache]: Analyzing trace with hash 1577524331, now seen corresponding path program 1 times [2023-09-01 06:54:10,484 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-09-01 06:54:10,484 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1145160854] [2023-09-01 06:54:10,485 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-09-01 06:54:10,485 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-09-01 06:54:10,494 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-09-01 06:54:10,526 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-09-01 06:54:10,527 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-09-01 06:54:10,527 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1145160854] [2023-09-01 06:54:10,527 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1145160854] provided 1 perfect and 0 imperfect interpolant sequences [2023-09-01 06:54:10,527 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-09-01 06:54:10,527 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-09-01 06:54:10,528 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [917309549] [2023-09-01 06:54:10,528 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-09-01 06:54:10,528 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-09-01 06:54:10,528 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-09-01 06:54:10,529 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-09-01 06:54:10,529 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-09-01 06:54:10,537 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 304 out of 656 [2023-09-01 06:54:10,538 INFO L100 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 112 places, 159 transitions, 336 flow. Second operand has 3 states, 3 states have (on average 306.0) internal successors, (918), 3 states have internal predecessors, (918), 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) [2023-09-01 06:54:10,538 INFO L109 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-09-01 06:54:10,538 INFO L110 encePairwiseOnDemand]: Number of universal subtrahend loopers: 304 of 656 [2023-09-01 06:54:10,538 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-09-01 06:54:14,978 INFO L130 PetriNetUnfolder]: 53493/80832 cut-off events. [2023-09-01 06:54:14,978 INFO L131 PetriNetUnfolder]: For 186/186 co-relation queries the response was YES. [2023-09-01 06:54:15,076 INFO L83 FinitePrefix]: Finished finitePrefix Result has 158173 conditions, 80832 events. 53493/80832 cut-off events. For 186/186 co-relation queries the response was YES. Maximal size of possible extension queue 2458. Compared 617717 event pairs, 48250 based on Foata normal form. 8884/62781 useless extension candidates. Maximal degree in co-relation 74499. Up to 77200 conditions per place. [2023-09-01 06:54:15,156 INFO L137 encePairwiseOnDemand]: 611/656 looper letters, 56 selfloop transitions, 2 changer transitions 53/118 dead transitions. [2023-09-01 06:54:15,157 INFO L142 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 114 places, 118 transitions, 460 flow [2023-09-01 06:54:15,157 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-09-01 06:54:15,158 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-09-01 06:54:15,159 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 1058 transitions. [2023-09-01 06:54:15,160 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.5376016260162602 [2023-09-01 06:54:15,160 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 1058 transitions. [2023-09-01 06:54:15,160 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 1058 transitions. [2023-09-01 06:54:15,160 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-09-01 06:54:15,161 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 1058 transitions. [2023-09-01 06:54:15,163 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 352.6666666666667) internal successors, (1058), 3 states have internal predecessors, (1058), 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) [2023-09-01 06:54:15,165 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 656.0) internal successors, (2624), 4 states have internal predecessors, (2624), 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) [2023-09-01 06:54:15,166 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 656.0) internal successors, (2624), 4 states have internal predecessors, (2624), 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) [2023-09-01 06:54:15,166 INFO L175 Difference]: Start difference. First operand has 112 places, 159 transitions, 336 flow. Second operand 3 states and 1058 transitions. [2023-09-01 06:54:15,166 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 114 places, 118 transitions, 460 flow [2023-09-01 06:54:15,170 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 114 places, 118 transitions, 460 flow, removed 0 selfloop flow, removed 0 redundant places. [2023-09-01 06:54:15,171 INFO L231 Difference]: Finished difference. Result has 115 places, 65 transitions, 152 flow [2023-09-01 06:54:15,172 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=656, PETRI_DIFFERENCE_MINUEND_FLOW=252, PETRI_DIFFERENCE_MINUEND_PLACES=112, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=117, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=115, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=152, PETRI_PLACES=115, PETRI_TRANSITIONS=65} [2023-09-01 06:54:15,173 INFO L281 CegarLoopForPetriNet]: 112 programPoint places, 3 predicate places. [2023-09-01 06:54:15,173 INFO L495 AbstractCegarLoop]: Abstraction has has 115 places, 65 transitions, 152 flow [2023-09-01 06:54:15,174 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 306.0) internal successors, (918), 3 states have internal predecessors, (918), 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) [2023-09-01 06:54:15,174 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-09-01 06:54:15,174 INFO L208 CegarLoopForPetriNet]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1] [2023-09-01 06:54:15,174 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2023-09-01 06:54:15,174 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-09-01 06:54:15,175 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-09-01 06:54:15,175 INFO L85 PathProgramCache]: Analyzing trace with hash -2081515054, now seen corresponding path program 1 times [2023-09-01 06:54:15,175 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-09-01 06:54:15,175 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1751908040] [2023-09-01 06:54:15,175 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-09-01 06:54:15,178 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-09-01 06:54:15,189 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-09-01 06:54:15,207 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-09-01 06:54:15,208 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-09-01 06:54:15,208 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1751908040] [2023-09-01 06:54:15,208 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1751908040] provided 0 perfect and 1 imperfect interpolant sequences [2023-09-01 06:54:15,208 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1615137086] [2023-09-01 06:54:15,208 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-09-01 06:54:15,209 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-09-01 06:54:15,209 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-09-01 06:54:15,210 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) [2023-09-01 06:54:15,212 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-09-01 06:54:15,272 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-09-01 06:54:15,273 INFO L263 TraceCheckSpWp]: Trace formula consists of 124 conjuncts, 3 conjunts are in the unsatisfiable core [2023-09-01 06:54:15,274 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2023-09-01 06:54:15,293 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-09-01 06:54:15,293 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2023-09-01 06:54:15,304 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-09-01 06:54:15,305 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1615137086] provided 0 perfect and 2 imperfect interpolant sequences [2023-09-01 06:54:15,305 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-09-01 06:54:15,305 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 5 [2023-09-01 06:54:15,305 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1031320739] [2023-09-01 06:54:15,305 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-09-01 06:54:15,306 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-09-01 06:54:15,307 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-09-01 06:54:15,309 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-09-01 06:54:15,310 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2023-09-01 06:54:15,326 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 303 out of 656 [2023-09-01 06:54:15,328 INFO L100 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 115 places, 65 transitions, 152 flow. Second operand has 6 states, 6 states have (on average 304.6666666666667) internal successors, (1828), 6 states have internal predecessors, (1828), 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) [2023-09-01 06:54:15,328 INFO L109 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-09-01 06:54:15,329 INFO L110 encePairwiseOnDemand]: Number of universal subtrahend loopers: 303 of 656 [2023-09-01 06:54:15,329 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-09-01 06:54:15,954 INFO L130 PetriNetUnfolder]: 6470/10111 cut-off events. [2023-09-01 06:54:15,954 INFO L131 PetriNetUnfolder]: For 77/77 co-relation queries the response was YES. [2023-09-01 06:54:15,963 INFO L83 FinitePrefix]: Finished finitePrefix Result has 19895 conditions, 10111 events. 6470/10111 cut-off events. For 77/77 co-relation queries the response was YES. Maximal size of possible extension queue 451. Compared 64914 event pairs, 5929 based on Foata normal form. 0/6052 useless extension candidates. Maximal degree in co-relation 19882. Up to 9679 conditions per place. [2023-09-01 06:54:15,982 INFO L137 encePairwiseOnDemand]: 653/656 looper letters, 56 selfloop transitions, 5 changer transitions 0/68 dead transitions. [2023-09-01 06:54:15,986 INFO L142 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 72 places, 68 transitions, 286 flow [2023-09-01 06:54:15,986 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-09-01 06:54:15,987 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6 states. [2023-09-01 06:54:15,992 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6 states to 6 states and 1882 transitions. [2023-09-01 06:54:15,994 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.47815040650406504 [2023-09-01 06:54:15,994 INFO L72 ComplementDD]: Start complementDD. Operand 6 states and 1882 transitions. [2023-09-01 06:54:15,994 INFO L73 IsDeterministic]: Start isDeterministic. Operand 6 states and 1882 transitions. [2023-09-01 06:54:15,995 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-09-01 06:54:15,996 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 6 states and 1882 transitions. [2023-09-01 06:54:16,000 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 7 states, 6 states have (on average 313.6666666666667) internal successors, (1882), 6 states have internal predecessors, (1882), 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) [2023-09-01 06:54:16,006 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 7 states, 7 states have (on average 656.0) internal successors, (4592), 7 states have internal predecessors, (4592), 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) [2023-09-01 06:54:16,008 INFO L81 ComplementDD]: Finished complementDD. Result has 7 states, 7 states have (on average 656.0) internal successors, (4592), 7 states have internal predecessors, (4592), 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) [2023-09-01 06:54:16,008 INFO L175 Difference]: Start difference. First operand has 115 places, 65 transitions, 152 flow. Second operand 6 states and 1882 transitions. [2023-09-01 06:54:16,008 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 72 places, 68 transitions, 286 flow [2023-09-01 06:54:16,009 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 71 places, 68 transitions, 280 flow, removed 2 selfloop flow, removed 1 redundant places. [2023-09-01 06:54:16,010 INFO L231 Difference]: Finished difference. Result has 74 places, 68 transitions, 182 flow [2023-09-01 06:54:16,010 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=656, PETRI_DIFFERENCE_MINUEND_FLOW=146, PETRI_DIFFERENCE_MINUEND_PLACES=66, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=65, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=3, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=62, PETRI_DIFFERENCE_SUBTRAHEND_STATES=6, PETRI_FLOW=182, PETRI_PLACES=74, PETRI_TRANSITIONS=68} [2023-09-01 06:54:16,013 INFO L281 CegarLoopForPetriNet]: 112 programPoint places, -38 predicate places. [2023-09-01 06:54:16,014 INFO L495 AbstractCegarLoop]: Abstraction has has 74 places, 68 transitions, 182 flow [2023-09-01 06:54:16,014 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 304.6666666666667) internal successors, (1828), 6 states have internal predecessors, (1828), 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) [2023-09-01 06:54:16,014 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-09-01 06:54:16,014 INFO L208 CegarLoopForPetriNet]: trace histogram [4, 3, 2, 2, 1, 1, 1, 1, 1] [2023-09-01 06:54:16,020 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-09-01 06:54:16,220 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 [2023-09-01 06:54:16,220 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-09-01 06:54:16,220 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-09-01 06:54:16,220 INFO L85 PathProgramCache]: Analyzing trace with hash 1521401387, now seen corresponding path program 2 times [2023-09-01 06:54:16,220 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-09-01 06:54:16,221 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [858876756] [2023-09-01 06:54:16,221 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-09-01 06:54:16,221 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-09-01 06:54:16,235 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-09-01 06:54:16,281 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-09-01 06:54:16,282 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-09-01 06:54:16,282 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [858876756] [2023-09-01 06:54:16,283 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [858876756] provided 0 perfect and 1 imperfect interpolant sequences [2023-09-01 06:54:16,283 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [366915051] [2023-09-01 06:54:16,283 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2023-09-01 06:54:16,283 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-09-01 06:54:16,283 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-09-01 06:54:16,284 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) [2023-09-01 06:54:16,286 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-09-01 06:54:16,355 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2023-09-01 06:54:16,355 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-09-01 06:54:16,356 INFO L263 TraceCheckSpWp]: Trace formula consists of 148 conjuncts, 6 conjunts are in the unsatisfiable core [2023-09-01 06:54:16,357 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2023-09-01 06:54:16,376 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-09-01 06:54:16,376 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2023-09-01 06:54:16,422 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-09-01 06:54:16,422 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [366915051] provided 0 perfect and 2 imperfect interpolant sequences [2023-09-01 06:54:16,422 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-09-01 06:54:16,422 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 11 [2023-09-01 06:54:16,423 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1648860695] [2023-09-01 06:54:16,423 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-09-01 06:54:16,423 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2023-09-01 06:54:16,423 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-09-01 06:54:16,424 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2023-09-01 06:54:16,428 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132 [2023-09-01 06:54:16,457 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 303 out of 656 [2023-09-01 06:54:16,459 INFO L100 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 74 places, 68 transitions, 182 flow. Second operand has 12 states, 12 states have (on average 304.3333333333333) internal successors, (3652), 12 states have internal predecessors, (3652), 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) [2023-09-01 06:54:16,459 INFO L109 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-09-01 06:54:16,460 INFO L110 encePairwiseOnDemand]: Number of universal subtrahend loopers: 303 of 656 [2023-09-01 06:54:16,460 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-09-01 06:54:16,924 INFO L130 PetriNetUnfolder]: 6470/10117 cut-off events. [2023-09-01 06:54:16,925 INFO L131 PetriNetUnfolder]: For 90/90 co-relation queries the response was YES. [2023-09-01 06:54:16,937 INFO L83 FinitePrefix]: Finished finitePrefix Result has 19925 conditions, 10117 events. 6470/10117 cut-off events. For 90/90 co-relation queries the response was YES. Maximal size of possible extension queue 449. Compared 64981 event pairs, 5929 based on Foata normal form. 6/6065 useless extension candidates. Maximal degree in co-relation 19866. Up to 9679 conditions per place. [2023-09-01 06:54:16,959 INFO L137 encePairwiseOnDemand]: 653/656 looper letters, 56 selfloop transitions, 11 changer transitions 0/74 dead transitions. [2023-09-01 06:54:16,959 INFO L142 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 85 places, 74 transitions, 352 flow [2023-09-01 06:54:16,960 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2023-09-01 06:54:16,960 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2023-09-01 06:54:16,965 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 3709 transitions. [2023-09-01 06:54:16,967 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4711636178861789 [2023-09-01 06:54:16,967 INFO L72 ComplementDD]: Start complementDD. Operand 12 states and 3709 transitions. [2023-09-01 06:54:16,967 INFO L73 IsDeterministic]: Start isDeterministic. Operand 12 states and 3709 transitions. [2023-09-01 06:54:16,968 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-09-01 06:54:16,968 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 12 states and 3709 transitions. [2023-09-01 06:54:16,973 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 13 states, 12 states have (on average 309.0833333333333) internal successors, (3709), 12 states have internal predecessors, (3709), 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) [2023-09-01 06:54:16,980 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 13 states, 13 states have (on average 656.0) internal successors, (8528), 13 states have internal predecessors, (8528), 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) [2023-09-01 06:54:16,989 INFO L81 ComplementDD]: Finished complementDD. Result has 13 states, 13 states have (on average 656.0) internal successors, (8528), 13 states have internal predecessors, (8528), 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) [2023-09-01 06:54:16,989 INFO L175 Difference]: Start difference. First operand has 74 places, 68 transitions, 182 flow. Second operand 12 states and 3709 transitions. [2023-09-01 06:54:16,989 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 85 places, 74 transitions, 352 flow [2023-09-01 06:54:16,990 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 84 places, 74 transitions, 338 flow, removed 6 selfloop flow, removed 1 redundant places. [2023-09-01 06:54:16,991 INFO L231 Difference]: Finished difference. Result has 90 places, 74 transitions, 252 flow [2023-09-01 06:54:16,991 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=656, PETRI_DIFFERENCE_MINUEND_FLOW=168, PETRI_DIFFERENCE_MINUEND_PLACES=73, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=68, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=6, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=62, PETRI_DIFFERENCE_SUBTRAHEND_STATES=12, PETRI_FLOW=252, PETRI_PLACES=90, PETRI_TRANSITIONS=74} [2023-09-01 06:54:16,992 INFO L281 CegarLoopForPetriNet]: 112 programPoint places, -22 predicate places. [2023-09-01 06:54:16,992 INFO L495 AbstractCegarLoop]: Abstraction has has 90 places, 74 transitions, 252 flow [2023-09-01 06:54:16,992 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 304.3333333333333) internal successors, (3652), 12 states have internal predecessors, (3652), 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) [2023-09-01 06:54:16,993 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-09-01 06:54:16,993 INFO L208 CegarLoopForPetriNet]: trace histogram [10, 3, 2, 2, 1, 1, 1, 1, 1] [2023-09-01 06:54:17,004 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-09-01 06:54:17,201 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 [2023-09-01 06:54:17,201 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-09-01 06:54:17,202 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-09-01 06:54:17,202 INFO L85 PathProgramCache]: Analyzing trace with hash -1483453237, now seen corresponding path program 3 times [2023-09-01 06:54:17,202 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-09-01 06:54:17,202 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [611073499] [2023-09-01 06:54:17,202 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-09-01 06:54:17,202 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-09-01 06:54:17,216 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-09-01 06:54:17,216 INFO L356 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2023-09-01 06:54:17,224 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-09-01 06:54:17,230 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2023-09-01 06:54:17,236 INFO L360 BasicCegarLoop]: Counterexample is feasible [2023-09-01 06:54:17,237 INFO L805 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (0 of 1 remaining) [2023-09-01 06:54:17,237 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2023-09-01 06:54:17,237 INFO L445 BasicCegarLoop]: Path program histogram: [3, 1] [2023-09-01 06:54:17,238 INFO L307 ceAbstractionStarter]: Result for error location InUseError was UNSAFE (1/2) [2023-09-01 06:54:17,238 WARN L233 ceAbstractionStarter]: 2 thread instances were not sufficient, I will increase this number and restart the analysis [2023-09-01 06:54:17,238 INFO L515 ceAbstractionStarter]: Constructing petrified ICFG for 3 thread instances. [2023-09-01 06:54:17,267 INFO L144 ThreadInstanceAdder]: Constructed 3 joinOtherThreadTransitions. [2023-09-01 06:54:17,269 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 380 places, 448 transitions, 926 flow [2023-09-01 06:54:17,373 INFO L130 PetriNetUnfolder]: 168/1009 cut-off events. [2023-09-01 06:54:17,373 INFO L131 PetriNetUnfolder]: For 19/19 co-relation queries the response was YES. [2023-09-01 06:54:17,389 INFO L83 FinitePrefix]: Finished finitePrefix Result has 1037 conditions, 1009 events. 168/1009 cut-off events. For 19/19 co-relation queries the response was YES. Maximal size of possible extension queue 23. Compared 5674 event pairs, 1 based on Foata normal form. 0/757 useless extension candidates. Maximal degree in co-relation 710. Up to 16 conditions per place. [2023-09-01 06:54:17,389 INFO L82 GeneralOperation]: Start removeDead. Operand has 380 places, 448 transitions, 926 flow [2023-09-01 06:54:17,396 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 378 places, 446 transitions, 922 flow [2023-09-01 06:54:17,397 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-09-01 06:54:17,397 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 378 places, 446 transitions, 922 flow [2023-09-01 06:54:17,397 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 378 places, 446 transitions, 922 flow [2023-09-01 06:54:17,397 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 378 places, 446 transitions, 922 flow [2023-09-01 06:54:17,520 INFO L130 PetriNetUnfolder]: 168/1007 cut-off events. [2023-09-01 06:54:17,520 INFO L131 PetriNetUnfolder]: For 19/19 co-relation queries the response was YES. [2023-09-01 06:54:17,536 INFO L83 FinitePrefix]: Finished finitePrefix Result has 1035 conditions, 1007 events. 168/1007 cut-off events. For 19/19 co-relation queries the response was YES. Maximal size of possible extension queue 23. Compared 5683 event pairs, 1 based on Foata normal form. 0/757 useless extension candidates. Maximal degree in co-relation 708. Up to 16 conditions per place. [2023-09-01 06:54:17,577 INFO L119 LiptonReduction]: Number of co-enabled transitions 120480 [2023-09-01 06:54:21,511 INFO L134 LiptonReduction]: Checked pairs total: 195541 [2023-09-01 06:54:21,511 INFO L136 LiptonReduction]: Total number of compositions: 359 [2023-09-01 06:54:21,513 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == InUseError ======== [2023-09-01 06:54:21,515 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;@1a7d48b0, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-09-01 06:54:21,516 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-09-01 06:54:21,533 INFO L130 PetriNetUnfolder]: 88/294 cut-off events. [2023-09-01 06:54:21,533 INFO L131 PetriNetUnfolder]: For 10/10 co-relation queries the response was YES. [2023-09-01 06:54:21,534 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-09-01 06:54:21,534 INFO L208 CegarLoopForPetriNet]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1] [2023-09-01 06:54:21,534 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-09-01 06:54:21,534 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-09-01 06:54:21,534 INFO L85 PathProgramCache]: Analyzing trace with hash 1187645583, now seen corresponding path program 1 times [2023-09-01 06:54:21,535 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-09-01 06:54:21,535 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1744607074] [2023-09-01 06:54:21,535 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-09-01 06:54:21,535 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-09-01 06:54:21,543 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-09-01 06:54:21,587 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2023-09-01 06:54:21,588 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-09-01 06:54:21,588 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1744607074] [2023-09-01 06:54:21,588 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1744607074] provided 1 perfect and 0 imperfect interpolant sequences [2023-09-01 06:54:21,588 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-09-01 06:54:21,588 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-09-01 06:54:21,588 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1822206054] [2023-09-01 06:54:21,588 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-09-01 06:54:21,588 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-09-01 06:54:21,588 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-09-01 06:54:21,589 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-09-01 06:54:21,589 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-09-01 06:54:21,597 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 371 out of 807 [2023-09-01 06:54:21,598 INFO L100 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 139 places, 196 transitions, 422 flow. Second operand has 3 states, 3 states have (on average 373.3333333333333) internal successors, (1120), 3 states have internal predecessors, (1120), 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) [2023-09-01 06:54:21,599 INFO L109 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-09-01 06:54:21,599 INFO L110 encePairwiseOnDemand]: Number of universal subtrahend loopers: 371 of 807 [2023-09-01 06:54:21,599 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand