./Ultimate.py --spec ../../../trunk/examples/svcomp/properties/no-overflow.prp --file ../../../trunk/examples/svcomp/goblint-regression/28-race_reach_73-funloop_hard_racefree.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_73-funloop_hard_racefree.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 c8af2e9e80aefb6a93651d6c869df13510f679bd9566c8571973545c9393aab5 --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 06:54:39,454 INFO L177 SettingsManager]: Resetting all preferences to default values... [2023-09-01 06:54:39,457 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2023-09-01 06:54:39,500 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2023-09-01 06:54:39,502 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2023-09-01 06:54:39,505 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2023-09-01 06:54:39,507 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2023-09-01 06:54:39,510 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2023-09-01 06:54:39,512 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2023-09-01 06:54:39,517 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2023-09-01 06:54:39,518 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2023-09-01 06:54:39,520 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2023-09-01 06:54:39,520 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2023-09-01 06:54:39,522 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2023-09-01 06:54:39,523 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2023-09-01 06:54:39,528 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2023-09-01 06:54:39,529 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2023-09-01 06:54:39,531 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2023-09-01 06:54:39,532 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2023-09-01 06:54:39,537 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2023-09-01 06:54:39,551 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2023-09-01 06:54:39,553 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2023-09-01 06:54:39,553 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2023-09-01 06:54:39,555 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2023-09-01 06:54:39,562 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2023-09-01 06:54:39,562 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2023-09-01 06:54:39,562 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2023-09-01 06:54:39,565 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2023-09-01 06:54:39,565 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2023-09-01 06:54:39,566 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2023-09-01 06:54:39,566 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2023-09-01 06:54:39,574 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2023-09-01 06:54:39,576 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2023-09-01 06:54:39,576 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2023-09-01 06:54:39,577 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2023-09-01 06:54:39,577 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2023-09-01 06:54:39,578 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2023-09-01 06:54:39,578 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2023-09-01 06:54:39,578 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2023-09-01 06:54:39,579 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2023-09-01 06:54:39,580 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2023-09-01 06:54:39,582 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Overflow-32bit-Automizer_Default.epf [2023-09-01 06:54:39,616 INFO L113 SettingsManager]: Loading preferences was successful [2023-09-01 06:54:39,617 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2023-09-01 06:54:39,618 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-09-01 06:54:39,618 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-09-01 06:54:39,619 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-09-01 06:54:39,619 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-09-01 06:54:39,619 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2023-09-01 06:54:39,620 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2023-09-01 06:54:39,620 INFO L138 SettingsManager]: * Use SBE=true [2023-09-01 06:54:39,620 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-09-01 06:54:39,621 INFO L138 SettingsManager]: * sizeof long=4 [2023-09-01 06:54:39,621 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2023-09-01 06:54:39,621 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2023-09-01 06:54:39,621 INFO L138 SettingsManager]: * sizeof POINTER=4 [2023-09-01 06:54:39,622 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2023-09-01 06:54:39,622 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-09-01 06:54:39,622 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-09-01 06:54:39,622 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-09-01 06:54:39,622 INFO L138 SettingsManager]: * Check absence of signed integer overflows=true [2023-09-01 06:54:39,623 INFO L138 SettingsManager]: * sizeof long double=12 [2023-09-01 06:54:39,623 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2023-09-01 06:54:39,623 INFO L138 SettingsManager]: * Use constant arrays=true [2023-09-01 06:54:39,623 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-09-01 06:54:39,623 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-09-01 06:54:39,624 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2023-09-01 06:54:39,624 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2023-09-01 06:54:39,624 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-09-01 06:54:39,624 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-09-01 06:54:39,624 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-09-01 06:54:39,625 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2023-09-01 06:54:39,625 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2023-09-01 06:54:39,625 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-09-01 06:54:39,625 INFO L138 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2023-09-01 06:54:39,625 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-09-01 06:54:39,626 INFO L138 SettingsManager]: * Order on configurations for Petri net unfoldings=DBO [2023-09-01 06:54:39,626 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-09-01 06:54:39,626 INFO L138 SettingsManager]: * Independence relation used for large block encoding in concurrent analysis=SYNTACTIC [2023-09-01 06:54:39,626 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! overflow) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> c8af2e9e80aefb6a93651d6c869df13510f679bd9566c8571973545c9393aab5 Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: When to check the insufficient erros location relative to the other error locations -> BEFORE [2023-09-01 06:54:39,949 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-09-01 06:54:39,972 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-09-01 06:54:39,974 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-09-01 06:54:39,975 INFO L271 PluginConnector]: Initializing CDTParser... [2023-09-01 06:54:39,975 INFO L275 PluginConnector]: CDTParser initialized [2023-09-01 06:54:39,977 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/goblint-regression/28-race_reach_73-funloop_hard_racefree.i [2023-09-01 06:54:41,217 INFO L500 CDTParser]: Created temporary CDT project at NULL [2023-09-01 06:54:41,474 INFO L351 CDTParser]: Found 1 translation units. [2023-09-01 06:54:41,474 INFO L172 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/goblint-regression/28-race_reach_73-funloop_hard_racefree.i [2023-09-01 06:54:41,511 INFO L394 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/d4be5212c/e2eee3a639ed47a09054c514cb6d2ff0/FLAGf81806f02 [2023-09-01 06:54:41,524 INFO L402 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/d4be5212c/e2eee3a639ed47a09054c514cb6d2ff0 [2023-09-01 06:54:41,525 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-09-01 06:54:41,526 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2023-09-01 06:54:41,528 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-09-01 06:54:41,528 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-09-01 06:54:41,531 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2023-09-01 06:54:41,531 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 01.09 06:54:41" (1/1) ... [2023-09-01 06:54:41,532 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6ee0a9c4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.09 06:54:41, skipping insertion in model container [2023-09-01 06:54:41,533 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 01.09 06:54:41" (1/1) ... [2023-09-01 06:54:41,538 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2023-09-01 06:54:41,574 INFO L178 MainTranslator]: Built tables and reachable declarations [2023-09-01 06:54:41,992 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_73-funloop_hard_racefree.i[41323,41336] [2023-09-01 06:54:42,033 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-09-01 06:54:42,057 INFO L203 MainTranslator]: Completed pre-run [2023-09-01 06:54:42,101 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_73-funloop_hard_racefree.i[41323,41336] [2023-09-01 06:54:42,125 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-09-01 06:54:42,214 INFO L208 MainTranslator]: Completed translation [2023-09-01 06:54:42,215 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.09 06:54:42 WrapperNode [2023-09-01 06:54:42,215 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-09-01 06:54:42,217 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-09-01 06:54:42,217 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-09-01 06:54:42,217 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2023-09-01 06:54:42,223 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.09 06:54:42" (1/1) ... [2023-09-01 06:54:42,253 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.09 06:54:42" (1/1) ... [2023-09-01 06:54:42,292 INFO L138 Inliner]: procedures = 271, calls = 41, calls flagged for inlining = 6, calls inlined = 7, statements flattened = 272 [2023-09-01 06:54:42,294 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-09-01 06:54:42,296 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-09-01 06:54:42,297 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2023-09-01 06:54:42,297 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2023-09-01 06:54:42,305 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.09 06:54:42" (1/1) ... [2023-09-01 06:54:42,306 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.09 06:54:42" (1/1) ... [2023-09-01 06:54:42,323 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.09 06:54:42" (1/1) ... [2023-09-01 06:54:42,324 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.09 06:54:42" (1/1) ... [2023-09-01 06:54:42,332 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.09 06:54:42" (1/1) ... [2023-09-01 06:54:42,346 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.09 06:54:42" (1/1) ... [2023-09-01 06:54:42,355 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.09 06:54:42" (1/1) ... [2023-09-01 06:54:42,357 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.09 06:54:42" (1/1) ... [2023-09-01 06:54:42,360 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-09-01 06:54:42,368 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-09-01 06:54:42,369 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2023-09-01 06:54:42,369 INFO L275 PluginConnector]: RCFGBuilder initialized [2023-09-01 06:54:42,370 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.09 06:54:42" (1/1) ... [2023-09-01 06:54:42,375 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-09-01 06:54:42,387 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-09-01 06:54:42,402 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 06:54:42,428 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 06:54:42,447 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-09-01 06:54:42,447 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-09-01 06:54:42,447 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-09-01 06:54:42,448 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-09-01 06:54:42,448 INFO L130 BoogieDeclarations]: Found specification of procedure #PthreadsMutexLock [2023-09-01 06:54:42,448 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-09-01 06:54:42,448 INFO L130 BoogieDeclarations]: Found specification of procedure t_fun [2023-09-01 06:54:42,448 INFO L138 BoogieDeclarations]: Found implementation of procedure t_fun [2023-09-01 06:54:42,449 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-09-01 06:54:42,449 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-09-01 06:54:42,449 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-09-01 06:54:42,451 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 06:54:42,617 INFO L236 CfgBuilder]: Building ICFG [2023-09-01 06:54:42,619 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-09-01 06:54:43,022 INFO L277 CfgBuilder]: Performing block encoding [2023-09-01 06:54:43,045 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-09-01 06:54:43,046 INFO L302 CfgBuilder]: Removed 35 assume(true) statements. [2023-09-01 06:54:43,048 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 01.09 06:54:43 BoogieIcfgContainer [2023-09-01 06:54:43,048 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-09-01 06:54:43,050 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-09-01 06:54:43,050 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2023-09-01 06:54:43,061 INFO L275 PluginConnector]: TraceAbstraction initialized [2023-09-01 06:54:43,062 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 01.09 06:54:41" (1/3) ... [2023-09-01 06:54:43,062 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1329023f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 01.09 06:54:43, skipping insertion in model container [2023-09-01 06:54:43,062 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.09 06:54:42" (2/3) ... [2023-09-01 06:54:43,063 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1329023f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 01.09 06:54:43, skipping insertion in model container [2023-09-01 06:54:43,063 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 01.09 06:54:43" (3/3) ... [2023-09-01 06:54:43,064 INFO L112 eAbstractionObserver]: Analyzing ICFG 28-race_reach_73-funloop_hard_racefree.i [2023-09-01 06:54:43,072 WARN L145 ceAbstractionStarter]: Switching off computation of Hoare annotation because input is a concurrent program [2023-09-01 06:54:43,081 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-09-01 06:54:43,081 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 22 error locations. [2023-09-01 06:54:43,081 INFO L515 ceAbstractionStarter]: Constructing petrified ICFG for 1 thread instances. [2023-09-01 06:54:43,210 INFO L144 ThreadInstanceAdder]: Constructed 1 joinOtherThreadTransitions. [2023-09-01 06:54:43,244 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 245 places, 287 transitions, 582 flow [2023-09-01 06:54:43,372 INFO L130 PetriNetUnfolder]: 73/440 cut-off events. [2023-09-01 06:54:43,372 INFO L131 PetriNetUnfolder]: For 1/1 co-relation queries the response was YES. [2023-09-01 06:54:43,383 INFO L83 FinitePrefix]: Finished finitePrefix Result has 446 conditions, 440 events. 73/440 cut-off events. For 1/1 co-relation queries the response was YES. Maximal size of possible extension queue 18. Compared 2094 event pairs, 0 based on Foata normal form. 0/332 useless extension candidates. Maximal degree in co-relation 242. Up to 8 conditions per place. [2023-09-01 06:54:43,384 INFO L82 GeneralOperation]: Start removeDead. Operand has 245 places, 287 transitions, 582 flow [2023-09-01 06:54:43,391 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 235 places, 276 transitions, 557 flow [2023-09-01 06:54:43,394 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-09-01 06:54:43,401 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 235 places, 276 transitions, 557 flow [2023-09-01 06:54:43,404 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 235 places, 276 transitions, 557 flow [2023-09-01 06:54:43,404 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 235 places, 276 transitions, 557 flow [2023-09-01 06:54:43,453 INFO L130 PetriNetUnfolder]: 72/429 cut-off events. [2023-09-01 06:54:43,454 INFO L131 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2023-09-01 06:54:43,458 INFO L83 FinitePrefix]: Finished finitePrefix Result has 434 conditions, 429 events. 72/429 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 18. Compared 2007 event pairs, 0 based on Foata normal form. 0/325 useless extension candidates. Maximal degree in co-relation 242. Up to 8 conditions per place. [2023-09-01 06:54:43,485 INFO L119 LiptonReduction]: Number of co-enabled transitions 26080 [2023-09-01 06:54:46,912 INFO L134 LiptonReduction]: Checked pairs total: 39836 [2023-09-01 06:54:46,912 INFO L136 LiptonReduction]: Total number of compositions: 235 [2023-09-01 06:54:46,926 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == InUseError ======== [2023-09-01 06:54:46,931 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;@3afd2f76, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-09-01 06:54:46,932 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-09-01 06:54:46,937 INFO L130 PetriNetUnfolder]: 14/56 cut-off events. [2023-09-01 06:54:46,937 INFO L131 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2023-09-01 06:54:46,937 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-09-01 06:54:46,938 INFO L208 CegarLoopForPetriNet]: trace histogram [2, 1, 1, 1, 1, 1] [2023-09-01 06:54:46,938 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-09-01 06:54:46,943 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-09-01 06:54:46,943 INFO L85 PathProgramCache]: Analyzing trace with hash -1842672750, now seen corresponding path program 1 times [2023-09-01 06:54:46,950 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-09-01 06:54:46,951 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1459915753] [2023-09-01 06:54:46,951 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-09-01 06:54:46,951 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-09-01 06:54:47,045 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-09-01 06:54:47,214 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 06:54:47,215 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-09-01 06:54:47,215 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1459915753] [2023-09-01 06:54:47,215 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1459915753] provided 1 perfect and 0 imperfect interpolant sequences [2023-09-01 06:54:47,216 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-09-01 06:54:47,216 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-09-01 06:54:47,217 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1770249174] [2023-09-01 06:54:47,218 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-09-01 06:54:47,224 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-09-01 06:54:47,229 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-09-01 06:54:47,247 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-09-01 06:54:47,248 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-09-01 06:54:47,275 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 240 out of 522 [2023-09-01 06:54:47,278 INFO L100 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 80 places, 113 transitions, 231 flow. Second operand has 3 states, 3 states have (on average 241.66666666666666) internal successors, (725), 3 states have internal predecessors, (725), 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 06:54:47,279 INFO L109 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-09-01 06:54:47,279 INFO L110 encePairwiseOnDemand]: Number of universal subtrahend loopers: 240 of 522 [2023-09-01 06:54:47,280 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-09-01 06:54:47,609 INFO L130 PetriNetUnfolder]: 1055/2184 cut-off events. [2023-09-01 06:54:47,609 INFO L131 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2023-09-01 06:54:47,612 INFO L83 FinitePrefix]: Finished finitePrefix Result has 4172 conditions, 2184 events. 1055/2184 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 150. Compared 14581 event pairs, 903 based on Foata normal form. 289/1783 useless extension candidates. Maximal degree in co-relation 4065. Up to 1982 conditions per place. [2023-09-01 06:54:47,615 INFO L137 encePairwiseOnDemand]: 489/522 looper letters, 30 selfloop transitions, 2 changer transitions 47/84 dead transitions. [2023-09-01 06:54:47,616 INFO L142 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 82 places, 84 transitions, 315 flow [2023-09-01 06:54:47,617 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-09-01 06:54:47,619 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-09-01 06:54:47,627 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 822 transitions. [2023-09-01 06:54:47,631 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.524904214559387 [2023-09-01 06:54:47,633 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 822 transitions. [2023-09-01 06:54:47,633 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 822 transitions. [2023-09-01 06:54:47,635 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-09-01 06:54:47,638 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 822 transitions. [2023-09-01 06:54:47,642 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 274.0) internal successors, (822), 3 states have internal predecessors, (822), 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 06:54:47,649 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 522.0) internal successors, (2088), 4 states have internal predecessors, (2088), 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 06:54:47,650 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 522.0) internal successors, (2088), 4 states have internal predecessors, (2088), 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 06:54:47,652 INFO L175 Difference]: Start difference. First operand has 80 places, 113 transitions, 231 flow. Second operand 3 states and 822 transitions. [2023-09-01 06:54:47,653 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 82 places, 84 transitions, 315 flow [2023-09-01 06:54:47,656 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 82 places, 84 transitions, 315 flow, removed 0 selfloop flow, removed 0 redundant places. [2023-09-01 06:54:47,658 INFO L231 Difference]: Finished difference. Result has 83 places, 37 transitions, 89 flow [2023-09-01 06:54:47,660 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=522, 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 06:54:47,663 INFO L281 CegarLoopForPetriNet]: 80 programPoint places, 3 predicate places. [2023-09-01 06:54:47,663 INFO L495 AbstractCegarLoop]: Abstraction has has 83 places, 37 transitions, 89 flow [2023-09-01 06:54:47,664 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 241.66666666666666) internal successors, (725), 3 states have internal predecessors, (725), 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 06:54:47,664 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-09-01 06:54:47,664 INFO L208 CegarLoopForPetriNet]: trace histogram [2, 1, 1, 1, 1, 1, 1] [2023-09-01 06:54:47,664 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-09-01 06:54:47,665 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-09-01 06:54:47,665 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-09-01 06:54:47,665 INFO L85 PathProgramCache]: Analyzing trace with hash 153132088, now seen corresponding path program 1 times [2023-09-01 06:54:47,666 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-09-01 06:54:47,666 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [198408004] [2023-09-01 06:54:47,666 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-09-01 06:54:47,666 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-09-01 06:54:47,683 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-09-01 06:54:47,750 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 06:54:47,751 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-09-01 06:54:47,752 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [198408004] [2023-09-01 06:54:47,752 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [198408004] provided 0 perfect and 1 imperfect interpolant sequences [2023-09-01 06:54:47,753 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1312686717] [2023-09-01 06:54:47,753 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-09-01 06:54:47,754 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-09-01 06:54:47,754 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-09-01 06:54:47,761 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 06:54:47,797 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 06:54:47,846 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-09-01 06:54:47,848 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 3 conjunts are in the unsatisfiable core [2023-09-01 06:54:47,852 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2023-09-01 06:54:47,928 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 06:54:47,928 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2023-09-01 06:54:47,955 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 06:54:47,955 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1312686717] provided 0 perfect and 2 imperfect interpolant sequences [2023-09-01 06:54:47,955 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-09-01 06:54:47,955 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 6 [2023-09-01 06:54:47,956 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1767013697] [2023-09-01 06:54:47,956 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-09-01 06:54:47,957 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-09-01 06:54:47,957 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-09-01 06:54:47,957 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-09-01 06:54:47,958 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2023-09-01 06:54:48,012 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 239 out of 522 [2023-09-01 06:54:48,014 INFO L100 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 83 places, 37 transitions, 89 flow. Second operand has 7 states, 7 states have (on average 240.57142857142858) internal successors, (1684), 7 states have internal predecessors, (1684), 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 06:54:48,014 INFO L109 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-09-01 06:54:48,015 INFO L110 encePairwiseOnDemand]: Number of universal subtrahend loopers: 239 of 522 [2023-09-01 06:54:48,015 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-09-01 06:54:48,104 INFO L130 PetriNetUnfolder]: 118/277 cut-off events. [2023-09-01 06:54:48,104 INFO L131 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2023-09-01 06:54:48,105 INFO L83 FinitePrefix]: Finished finitePrefix Result has 545 conditions, 277 events. 118/277 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 22. Compared 1049 event pairs, 105 based on Foata normal form. 0/167 useless extension candidates. Maximal degree in co-relation 533. Up to 249 conditions per place. [2023-09-01 06:54:48,106 INFO L137 encePairwiseOnDemand]: 519/522 looper letters, 30 selfloop transitions, 5 changer transitions 0/40 dead transitions. [2023-09-01 06:54:48,106 INFO L142 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 44 places, 40 transitions, 171 flow [2023-09-01 06:54:48,106 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-09-01 06:54:48,106 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6 states. [2023-09-01 06:54:48,109 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6 states to 6 states and 1472 transitions. [2023-09-01 06:54:48,110 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.46998722860791825 [2023-09-01 06:54:48,110 INFO L72 ComplementDD]: Start complementDD. Operand 6 states and 1472 transitions. [2023-09-01 06:54:48,110 INFO L73 IsDeterministic]: Start isDeterministic. Operand 6 states and 1472 transitions. [2023-09-01 06:54:48,111 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-09-01 06:54:48,111 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 6 states and 1472 transitions. [2023-09-01 06:54:48,114 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 7 states, 6 states have (on average 245.33333333333334) internal successors, (1472), 6 states have internal predecessors, (1472), 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 06:54:48,120 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 7 states, 7 states have (on average 522.0) internal successors, (3654), 7 states have internal predecessors, (3654), 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 06:54:48,122 INFO L81 ComplementDD]: Finished complementDD. Result has 7 states, 7 states have (on average 522.0) internal successors, (3654), 7 states have internal predecessors, (3654), 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 06:54:48,123 INFO L175 Difference]: Start difference. First operand has 83 places, 37 transitions, 89 flow. Second operand 6 states and 1472 transitions. [2023-09-01 06:54:48,123 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 44 places, 40 transitions, 171 flow [2023-09-01 06:54:48,124 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 06:54:48,125 INFO L231 Difference]: Finished difference. Result has 46 places, 40 transitions, 121 flow [2023-09-01 06:54:48,125 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=522, 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 06:54:48,126 INFO L281 CegarLoopForPetriNet]: 80 programPoint places, -34 predicate places. [2023-09-01 06:54:48,126 INFO L495 AbstractCegarLoop]: Abstraction has has 46 places, 40 transitions, 121 flow [2023-09-01 06:54:48,127 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 240.57142857142858) internal successors, (1684), 7 states have internal predecessors, (1684), 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 06:54:48,127 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-09-01 06:54:48,127 INFO L208 CegarLoopForPetriNet]: trace histogram [4, 2, 1, 1, 1, 1, 1] [2023-09-01 06:54:48,135 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2023-09-01 06:54:48,332 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 06:54:48,332 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-09-01 06:54:48,333 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-09-01 06:54:48,333 INFO L85 PathProgramCache]: Analyzing trace with hash 1801258258, now seen corresponding path program 2 times [2023-09-01 06:54:48,333 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-09-01 06:54:48,333 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [737030905] [2023-09-01 06:54:48,333 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-09-01 06:54:48,334 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-09-01 06:54:48,372 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-09-01 06:54:48,502 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 06:54:48,502 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-09-01 06:54:48,503 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [737030905] [2023-09-01 06:54:48,505 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [737030905] provided 0 perfect and 1 imperfect interpolant sequences [2023-09-01 06:54:48,505 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [673950984] [2023-09-01 06:54:48,506 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2023-09-01 06:54:48,506 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-09-01 06:54:48,506 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-09-01 06:54:48,509 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 06:54:48,537 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 06:54:48,589 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2023-09-01 06:54:48,589 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-09-01 06:54:48,590 INFO L263 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 6 conjunts are in the unsatisfiable core [2023-09-01 06:54:48,591 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2023-09-01 06:54:48,608 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 06:54:48,609 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2023-09-01 06:54:48,666 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 06:54:48,667 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [673950984] provided 0 perfect and 2 imperfect interpolant sequences [2023-09-01 06:54:48,667 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-09-01 06:54:48,667 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 12 [2023-09-01 06:54:48,667 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1758531553] [2023-09-01 06:54:48,667 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-09-01 06:54:48,668 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2023-09-01 06:54:48,669 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-09-01 06:54:48,670 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2023-09-01 06:54:48,670 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=78, Unknown=0, NotChecked=0, Total=156 [2023-09-01 06:54:48,705 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 239 out of 522 [2023-09-01 06:54:48,709 INFO L100 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 46 places, 40 transitions, 121 flow. Second operand has 13 states, 13 states have (on average 240.30769230769232) internal successors, (3124), 13 states have internal predecessors, (3124), 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 06:54:48,709 INFO L109 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-09-01 06:54:48,709 INFO L110 encePairwiseOnDemand]: Number of universal subtrahend loopers: 239 of 522 [2023-09-01 06:54:48,710 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-09-01 06:54:48,826 INFO L130 PetriNetUnfolder]: 118/283 cut-off events. [2023-09-01 06:54:48,827 INFO L131 PetriNetUnfolder]: For 20/20 co-relation queries the response was YES. [2023-09-01 06:54:48,827 INFO L83 FinitePrefix]: Finished finitePrefix Result has 582 conditions, 283 events. 118/283 cut-off events. For 20/20 co-relation queries the response was YES. Maximal size of possible extension queue 22. Compared 1049 event pairs, 105 based on Foata normal form. 6/180 useless extension candidates. Maximal degree in co-relation 524. Up to 249 conditions per place. [2023-09-01 06:54:48,828 INFO L137 encePairwiseOnDemand]: 519/522 looper letters, 30 selfloop transitions, 11 changer transitions 0/46 dead transitions. [2023-09-01 06:54:48,828 INFO L142 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 57 places, 46 transitions, 239 flow [2023-09-01 06:54:48,829 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2023-09-01 06:54:48,829 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2023-09-01 06:54:48,834 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 2915 transitions. [2023-09-01 06:54:48,837 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.46535759897828866 [2023-09-01 06:54:48,837 INFO L72 ComplementDD]: Start complementDD. Operand 12 states and 2915 transitions. [2023-09-01 06:54:48,837 INFO L73 IsDeterministic]: Start isDeterministic. Operand 12 states and 2915 transitions. [2023-09-01 06:54:48,839 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-09-01 06:54:48,839 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 12 states and 2915 transitions. [2023-09-01 06:54:48,845 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 13 states, 12 states have (on average 242.91666666666666) internal successors, (2915), 12 states have internal predecessors, (2915), 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 06:54:48,855 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 13 states, 13 states have (on average 522.0) internal successors, (6786), 13 states have internal predecessors, (6786), 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 06:54:48,860 INFO L81 ComplementDD]: Finished complementDD. Result has 13 states, 13 states have (on average 522.0) internal successors, (6786), 13 states have internal predecessors, (6786), 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 06:54:48,860 INFO L175 Difference]: Start difference. First operand has 46 places, 40 transitions, 121 flow. Second operand 12 states and 2915 transitions. [2023-09-01 06:54:48,860 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 57 places, 46 transitions, 239 flow [2023-09-01 06:54:48,862 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 06:54:48,864 INFO L231 Difference]: Finished difference. Result has 62 places, 46 transitions, 191 flow [2023-09-01 06:54:48,864 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=522, 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 06:54:48,866 INFO L281 CegarLoopForPetriNet]: 80 programPoint places, -18 predicate places. [2023-09-01 06:54:48,866 INFO L495 AbstractCegarLoop]: Abstraction has has 62 places, 46 transitions, 191 flow [2023-09-01 06:54:48,868 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 240.30769230769232) internal successors, (3124), 13 states have internal predecessors, (3124), 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 06:54:48,868 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-09-01 06:54:48,868 INFO L208 CegarLoopForPetriNet]: trace histogram [10, 2, 1, 1, 1, 1, 1] [2023-09-01 06:54:48,881 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 06:54:49,075 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 06:54:49,075 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-09-01 06:54:49,076 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-09-01 06:54:49,076 INFO L85 PathProgramCache]: Analyzing trace with hash -1733848238, now seen corresponding path program 3 times [2023-09-01 06:54:49,076 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-09-01 06:54:49,076 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1306321460] [2023-09-01 06:54:49,076 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-09-01 06:54:49,076 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-09-01 06:54:49,123 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-09-01 06:54:49,127 INFO L356 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2023-09-01 06:54:49,146 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-09-01 06:54:49,179 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2023-09-01 06:54:49,180 INFO L360 BasicCegarLoop]: Counterexample is feasible [2023-09-01 06:54:49,181 INFO L805 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (0 of 1 remaining) [2023-09-01 06:54:49,182 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2023-09-01 06:54:49,183 INFO L445 BasicCegarLoop]: Path program histogram: [3, 1] [2023-09-01 06:54:49,185 INFO L307 ceAbstractionStarter]: Result for error location InUseError was UNSAFE (1/2) [2023-09-01 06:54:49,185 WARN L233 ceAbstractionStarter]: 1 thread instances were not sufficient, I will increase this number and restart the analysis [2023-09-01 06:54:49,186 INFO L515 ceAbstractionStarter]: Constructing petrified ICFG for 2 thread instances. [2023-09-01 06:54:49,228 INFO L144 ThreadInstanceAdder]: Constructed 2 joinOtherThreadTransitions. [2023-09-01 06:54:49,237 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 314 places, 369 transitions, 756 flow [2023-09-01 06:54:49,336 INFO L130 PetriNetUnfolder]: 118/711 cut-off events. [2023-09-01 06:54:49,337 INFO L131 PetriNetUnfolder]: For 6/6 co-relation queries the response was YES. [2023-09-01 06:54:49,344 INFO L83 FinitePrefix]: Finished finitePrefix Result has 725 conditions, 711 events. 118/711 cut-off events. For 6/6 co-relation queries the response was YES. Maximal size of possible extension queue 22. Compared 3792 event pairs, 0 based on Foata normal form. 0/535 useless extension candidates. Maximal degree in co-relation 442. Up to 12 conditions per place. [2023-09-01 06:54:49,344 INFO L82 GeneralOperation]: Start removeDead. Operand has 314 places, 369 transitions, 756 flow [2023-09-01 06:54:49,350 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 312 places, 367 transitions, 752 flow [2023-09-01 06:54:49,350 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-09-01 06:54:49,351 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 312 places, 367 transitions, 752 flow [2023-09-01 06:54:49,351 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 312 places, 367 transitions, 752 flow [2023-09-01 06:54:49,351 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 312 places, 367 transitions, 752 flow [2023-09-01 06:54:49,424 INFO L130 PetriNetUnfolder]: 118/709 cut-off events. [2023-09-01 06:54:49,425 INFO L131 PetriNetUnfolder]: For 6/6 co-relation queries the response was YES. [2023-09-01 06:54:49,435 INFO L83 FinitePrefix]: Finished finitePrefix Result has 723 conditions, 709 events. 118/709 cut-off events. For 6/6 co-relation queries the response was YES. Maximal size of possible extension queue 22. Compared 3785 event pairs, 0 based on Foata normal form. 0/535 useless extension candidates. Maximal degree in co-relation 440. Up to 12 conditions per place. [2023-09-01 06:54:49,464 INFO L119 LiptonReduction]: Number of co-enabled transitions 68000 [2023-09-01 06:54:53,611 INFO L134 LiptonReduction]: Checked pairs total: 121234 [2023-09-01 06:54:53,611 INFO L136 LiptonReduction]: Total number of compositions: 298 [2023-09-01 06:54:53,613 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == InUseError ======== [2023-09-01 06:54:53,614 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;@3afd2f76, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-09-01 06:54:53,615 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-09-01 06:54:53,625 INFO L130 PetriNetUnfolder]: 53/180 cut-off events. [2023-09-01 06:54:53,626 INFO L131 PetriNetUnfolder]: For 3/3 co-relation queries the response was YES. [2023-09-01 06:54:53,626 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-09-01 06:54:53,626 INFO L208 CegarLoopForPetriNet]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1] [2023-09-01 06:54:53,626 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-09-01 06:54:53,627 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-09-01 06:54:53,627 INFO L85 PathProgramCache]: Analyzing trace with hash 239477515, now seen corresponding path program 1 times [2023-09-01 06:54:53,627 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-09-01 06:54:53,627 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [583563362] [2023-09-01 06:54:53,628 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-09-01 06:54:53,628 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-09-01 06:54:53,636 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-09-01 06:54:53,656 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 06:54:53,656 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-09-01 06:54:53,656 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [583563362] [2023-09-01 06:54:53,657 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [583563362] provided 1 perfect and 0 imperfect interpolant sequences [2023-09-01 06:54:53,657 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-09-01 06:54:53,657 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-09-01 06:54:53,657 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1647430194] [2023-09-01 06:54:53,657 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-09-01 06:54:53,658 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-09-01 06:54:53,658 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-09-01 06:54:53,658 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-09-01 06:54:53,659 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-09-01 06:54:53,667 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 307 out of 667 [2023-09-01 06:54:53,669 INFO L100 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 112 places, 158 transitions, 334 flow. Second operand has 3 states, 3 states have (on average 309.0) internal successors, (927), 3 states have internal predecessors, (927), 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 06:54:53,669 INFO L109 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-09-01 06:54:53,669 INFO L110 encePairwiseOnDemand]: Number of universal subtrahend loopers: 307 of 667 [2023-09-01 06:54:53,669 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-09-01 06:54:59,353 INFO L130 PetriNetUnfolder]: 52323/79071 cut-off events. [2023-09-01 06:54:59,353 INFO L131 PetriNetUnfolder]: For 186/186 co-relation queries the response was YES. [2023-09-01 06:54:59,529 INFO L83 FinitePrefix]: Finished finitePrefix Result has 154707 conditions, 79071 events. 52323/79071 cut-off events. For 186/186 co-relation queries the response was YES. Maximal size of possible extension queue 2612. Compared 612159 event pairs, 47170 based on Foata normal form. 9339/61849 useless extension candidates. Maximal degree in co-relation 72853. Up to 75495 conditions per place. [2023-09-01 06:54:59,626 INFO L137 encePairwiseOnDemand]: 623/667 looper letters, 56 selfloop transitions, 2 changer transitions 53/118 dead transitions. [2023-09-01 06:54:59,626 INFO L142 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 114 places, 118 transitions, 458 flow [2023-09-01 06:54:59,627 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-09-01 06:54:59,627 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-09-01 06:54:59,632 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 1065 transitions. [2023-09-01 06:54:59,634 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.5322338830584707 [2023-09-01 06:54:59,634 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 1065 transitions. [2023-09-01 06:54:59,634 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 1065 transitions. [2023-09-01 06:54:59,635 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-09-01 06:54:59,635 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 1065 transitions. [2023-09-01 06:54:59,637 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 355.0) internal successors, (1065), 3 states have internal predecessors, (1065), 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 06:54:59,641 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 667.0) internal successors, (2668), 4 states have internal predecessors, (2668), 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 06:54:59,642 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 667.0) internal successors, (2668), 4 states have internal predecessors, (2668), 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 06:54:59,642 INFO L175 Difference]: Start difference. First operand has 112 places, 158 transitions, 334 flow. Second operand 3 states and 1065 transitions. [2023-09-01 06:54:59,642 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 114 places, 118 transitions, 458 flow [2023-09-01 06:54:59,646 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 114 places, 118 transitions, 458 flow, removed 0 selfloop flow, removed 0 redundant places. [2023-09-01 06:54:59,647 INFO L231 Difference]: Finished difference. Result has 115 places, 65 transitions, 152 flow [2023-09-01 06:54:59,648 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=667, 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 06:54:59,649 INFO L281 CegarLoopForPetriNet]: 112 programPoint places, 3 predicate places. [2023-09-01 06:54:59,649 INFO L495 AbstractCegarLoop]: Abstraction has has 115 places, 65 transitions, 152 flow [2023-09-01 06:54:59,649 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 309.0) internal successors, (927), 3 states have internal predecessors, (927), 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 06:54:59,649 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-09-01 06:54:59,650 INFO L208 CegarLoopForPetriNet]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1] [2023-09-01 06:54:59,650 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2023-09-01 06:54:59,650 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-09-01 06:54:59,650 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-09-01 06:54:59,651 INFO L85 PathProgramCache]: Analyzing trace with hash -122748961, now seen corresponding path program 1 times [2023-09-01 06:54:59,651 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-09-01 06:54:59,651 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [928780427] [2023-09-01 06:54:59,651 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-09-01 06:54:59,651 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-09-01 06:54:59,664 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-09-01 06:54:59,705 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 06:54:59,705 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-09-01 06:54:59,706 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [928780427] [2023-09-01 06:54:59,706 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [928780427] provided 0 perfect and 1 imperfect interpolant sequences [2023-09-01 06:54:59,708 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1289835906] [2023-09-01 06:54:59,708 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-09-01 06:54:59,708 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-09-01 06:54:59,709 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-09-01 06:54:59,710 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 06:54:59,746 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 06:54:59,786 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-09-01 06:54:59,788 INFO L263 TraceCheckSpWp]: Trace formula consists of 124 conjuncts, 3 conjunts are in the unsatisfiable core [2023-09-01 06:54:59,789 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2023-09-01 06:54:59,805 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 06:54:59,805 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2023-09-01 06:54:59,820 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 06:54:59,820 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1289835906] provided 0 perfect and 2 imperfect interpolant sequences [2023-09-01 06:54:59,821 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-09-01 06:54:59,821 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 6 [2023-09-01 06:54:59,821 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1101326906] [2023-09-01 06:54:59,821 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-09-01 06:54:59,822 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-09-01 06:54:59,822 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-09-01 06:54:59,825 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-09-01 06:54:59,825 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2023-09-01 06:54:59,840 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 306 out of 667 [2023-09-01 06:54:59,842 INFO L100 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 115 places, 65 transitions, 152 flow. Second operand has 7 states, 7 states have (on average 307.7142857142857) internal successors, (2154), 7 states have internal predecessors, (2154), 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 06:54:59,843 INFO L109 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-09-01 06:54:59,843 INFO L110 encePairwiseOnDemand]: Number of universal subtrahend loopers: 306 of 667 [2023-09-01 06:54:59,843 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-09-01 06:55:00,548 INFO L130 PetriNetUnfolder]: 6470/10111 cut-off events. [2023-09-01 06:55:00,549 INFO L131 PetriNetUnfolder]: For 77/77 co-relation queries the response was YES. [2023-09-01 06:55:00,562 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 449. Compared 65212 event pairs, 5929 based on Foata normal form. 0/6051 useless extension candidates. Maximal degree in co-relation 19882. Up to 9679 conditions per place. [2023-09-01 06:55:00,594 INFO L137 encePairwiseOnDemand]: 664/667 looper letters, 56 selfloop transitions, 5 changer transitions 0/68 dead transitions. [2023-09-01 06:55:00,595 INFO L142 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 72 places, 68 transitions, 286 flow [2023-09-01 06:55:00,595 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-09-01 06:55:00,595 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6 states. [2023-09-01 06:55:00,600 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6 states to 6 states and 1900 transitions. [2023-09-01 06:55:00,601 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.47476261869065467 [2023-09-01 06:55:00,601 INFO L72 ComplementDD]: Start complementDD. Operand 6 states and 1900 transitions. [2023-09-01 06:55:00,602 INFO L73 IsDeterministic]: Start isDeterministic. Operand 6 states and 1900 transitions. [2023-09-01 06:55:00,603 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-09-01 06:55:00,603 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 6 states and 1900 transitions. [2023-09-01 06:55:00,607 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 7 states, 6 states have (on average 316.6666666666667) internal successors, (1900), 6 states have internal predecessors, (1900), 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 06:55:00,613 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 7 states, 7 states have (on average 667.0) internal successors, (4669), 7 states have internal predecessors, (4669), 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 06:55:00,614 INFO L81 ComplementDD]: Finished complementDD. Result has 7 states, 7 states have (on average 667.0) internal successors, (4669), 7 states have internal predecessors, (4669), 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 06:55:00,614 INFO L175 Difference]: Start difference. First operand has 115 places, 65 transitions, 152 flow. Second operand 6 states and 1900 transitions. [2023-09-01 06:55:00,615 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 72 places, 68 transitions, 286 flow [2023-09-01 06:55:00,616 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 06:55:00,617 INFO L231 Difference]: Finished difference. Result has 74 places, 68 transitions, 182 flow [2023-09-01 06:55:00,617 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=667, 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 06:55:00,618 INFO L281 CegarLoopForPetriNet]: 112 programPoint places, -38 predicate places. [2023-09-01 06:55:00,618 INFO L495 AbstractCegarLoop]: Abstraction has has 74 places, 68 transitions, 182 flow [2023-09-01 06:55:00,619 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 307.7142857142857) internal successors, (2154), 7 states have internal predecessors, (2154), 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 06:55:00,619 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-09-01 06:55:00,619 INFO L208 CegarLoopForPetriNet]: trace histogram [4, 3, 2, 2, 1, 1, 1, 1, 1] [2023-09-01 06:55:00,630 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 06:55:00,824 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 06:55:00,825 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-09-01 06:55:00,825 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-09-01 06:55:00,825 INFO L85 PathProgramCache]: Analyzing trace with hash -805259253, now seen corresponding path program 2 times [2023-09-01 06:55:00,825 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-09-01 06:55:00,825 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1343977905] [2023-09-01 06:55:00,826 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-09-01 06:55:00,826 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-09-01 06:55:00,844 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-09-01 06:55:00,936 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 06:55:00,936 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-09-01 06:55:00,936 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1343977905] [2023-09-01 06:55:00,936 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1343977905] provided 0 perfect and 1 imperfect interpolant sequences [2023-09-01 06:55:00,939 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1336700139] [2023-09-01 06:55:00,940 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2023-09-01 06:55:00,940 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-09-01 06:55:00,940 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-09-01 06:55:00,941 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 06:55:00,971 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 06:55:01,036 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2023-09-01 06:55:01,037 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-09-01 06:55:01,038 INFO L263 TraceCheckSpWp]: Trace formula consists of 148 conjuncts, 6 conjunts are in the unsatisfiable core [2023-09-01 06:55:01,040 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2023-09-01 06:55:01,069 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 06:55:01,069 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2023-09-01 06:55:01,124 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 06:55:01,125 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1336700139] provided 0 perfect and 2 imperfect interpolant sequences [2023-09-01 06:55:01,125 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-09-01 06:55:01,125 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 12 [2023-09-01 06:55:01,125 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [544190748] [2023-09-01 06:55:01,125 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-09-01 06:55:01,126 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2023-09-01 06:55:01,126 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-09-01 06:55:01,127 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2023-09-01 06:55:01,127 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=78, Unknown=0, NotChecked=0, Total=156 [2023-09-01 06:55:01,160 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 306 out of 667 [2023-09-01 06:55:01,165 INFO L100 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 74 places, 68 transitions, 182 flow. Second operand has 13 states, 13 states have (on average 307.38461538461536) internal successors, (3996), 13 states have internal predecessors, (3996), 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 06:55:01,165 INFO L109 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-09-01 06:55:01,165 INFO L110 encePairwiseOnDemand]: Number of universal subtrahend loopers: 306 of 667 [2023-09-01 06:55:01,165 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-09-01 06:55:01,866 INFO L130 PetriNetUnfolder]: 6470/10117 cut-off events. [2023-09-01 06:55:01,867 INFO L131 PetriNetUnfolder]: For 90/90 co-relation queries the response was YES. [2023-09-01 06:55:01,882 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 65241 event pairs, 5929 based on Foata normal form. 6/6064 useless extension candidates. Maximal degree in co-relation 19866. Up to 9679 conditions per place. [2023-09-01 06:55:01,906 INFO L137 encePairwiseOnDemand]: 664/667 looper letters, 56 selfloop transitions, 11 changer transitions 0/74 dead transitions. [2023-09-01 06:55:01,907 INFO L142 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 85 places, 74 transitions, 352 flow [2023-09-01 06:55:01,907 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2023-09-01 06:55:01,907 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2023-09-01 06:55:01,914 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 3745 transitions. [2023-09-01 06:55:01,917 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.46789105447276363 [2023-09-01 06:55:01,917 INFO L72 ComplementDD]: Start complementDD. Operand 12 states and 3745 transitions. [2023-09-01 06:55:01,917 INFO L73 IsDeterministic]: Start isDeterministic. Operand 12 states and 3745 transitions. [2023-09-01 06:55:01,919 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-09-01 06:55:01,920 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 12 states and 3745 transitions. [2023-09-01 06:55:01,926 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 13 states, 12 states have (on average 312.0833333333333) internal successors, (3745), 12 states have internal predecessors, (3745), 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 06:55:01,937 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 13 states, 13 states have (on average 667.0) internal successors, (8671), 13 states have internal predecessors, (8671), 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 06:55:01,939 INFO L81 ComplementDD]: Finished complementDD. Result has 13 states, 13 states have (on average 667.0) internal successors, (8671), 13 states have internal predecessors, (8671), 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 06:55:01,940 INFO L175 Difference]: Start difference. First operand has 74 places, 68 transitions, 182 flow. Second operand 12 states and 3745 transitions. [2023-09-01 06:55:01,940 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 85 places, 74 transitions, 352 flow [2023-09-01 06:55:01,941 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 06:55:01,942 INFO L231 Difference]: Finished difference. Result has 90 places, 74 transitions, 252 flow [2023-09-01 06:55:01,943 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=667, 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 06:55:01,943 INFO L281 CegarLoopForPetriNet]: 112 programPoint places, -22 predicate places. [2023-09-01 06:55:01,943 INFO L495 AbstractCegarLoop]: Abstraction has has 90 places, 74 transitions, 252 flow [2023-09-01 06:55:01,945 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 307.38461538461536) internal successors, (3996), 13 states have internal predecessors, (3996), 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 06:55:01,945 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-09-01 06:55:01,945 INFO L208 CegarLoopForPetriNet]: trace histogram [10, 3, 2, 2, 1, 1, 1, 1, 1] [2023-09-01 06:55:01,955 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 06:55:02,150 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 06:55:02,151 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-09-01 06:55:02,151 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-09-01 06:55:02,151 INFO L85 PathProgramCache]: Analyzing trace with hash -1484658805, now seen corresponding path program 3 times [2023-09-01 06:55:02,151 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-09-01 06:55:02,152 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [337420212] [2023-09-01 06:55:02,152 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-09-01 06:55:02,152 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-09-01 06:55:02,175 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-09-01 06:55:02,176 INFO L356 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2023-09-01 06:55:02,190 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-09-01 06:55:02,198 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2023-09-01 06:55:02,198 INFO L360 BasicCegarLoop]: Counterexample is feasible [2023-09-01 06:55:02,198 INFO L805 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (0 of 1 remaining) [2023-09-01 06:55:02,199 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2023-09-01 06:55:02,199 INFO L445 BasicCegarLoop]: Path program histogram: [3, 1] [2023-09-01 06:55:02,199 INFO L307 ceAbstractionStarter]: Result for error location InUseError was UNSAFE (1/2) [2023-09-01 06:55:02,200 WARN L233 ceAbstractionStarter]: 2 thread instances were not sufficient, I will increase this number and restart the analysis [2023-09-01 06:55:02,200 INFO L515 ceAbstractionStarter]: Constructing petrified ICFG for 3 thread instances. [2023-09-01 06:55:02,232 INFO L144 ThreadInstanceAdder]: Constructed 3 joinOtherThreadTransitions. [2023-09-01 06:55:02,236 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 383 places, 451 transitions, 932 flow [2023-09-01 06:55:02,361 INFO L130 PetriNetUnfolder]: 168/1021 cut-off events. [2023-09-01 06:55:02,362 INFO L131 PetriNetUnfolder]: For 19/19 co-relation queries the response was YES. [2023-09-01 06:55:02,384 INFO L83 FinitePrefix]: Finished finitePrefix Result has 1049 conditions, 1021 events. 168/1021 cut-off events. For 19/19 co-relation queries the response was YES. Maximal size of possible extension queue 24. Compared 5733 event pairs, 1 based on Foata normal form. 0/769 useless extension candidates. Maximal degree in co-relation 719. Up to 16 conditions per place. [2023-09-01 06:55:02,385 INFO L82 GeneralOperation]: Start removeDead. Operand has 383 places, 451 transitions, 932 flow [2023-09-01 06:55:02,394 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 381 places, 449 transitions, 928 flow [2023-09-01 06:55:02,394 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-09-01 06:55:02,394 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 381 places, 449 transitions, 928 flow [2023-09-01 06:55:02,395 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 381 places, 449 transitions, 928 flow [2023-09-01 06:55:02,395 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 381 places, 449 transitions, 928 flow [2023-09-01 06:55:02,518 INFO L130 PetriNetUnfolder]: 168/1019 cut-off events. [2023-09-01 06:55:02,518 INFO L131 PetriNetUnfolder]: For 19/19 co-relation queries the response was YES. [2023-09-01 06:55:02,535 INFO L83 FinitePrefix]: Finished finitePrefix Result has 1047 conditions, 1019 events. 168/1019 cut-off events. For 19/19 co-relation queries the response was YES. Maximal size of possible extension queue 24. Compared 5753 event pairs, 1 based on Foata normal form. 0/769 useless extension candidates. Maximal degree in co-relation 717. Up to 16 conditions per place. [2023-09-01 06:55:02,589 INFO L119 LiptonReduction]: Number of co-enabled transitions 121920 [2023-09-01 06:55:07,168 INFO L134 LiptonReduction]: Checked pairs total: 216688 [2023-09-01 06:55:07,168 INFO L136 LiptonReduction]: Total number of compositions: 369 [2023-09-01 06:55:07,170 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == InUseError ======== [2023-09-01 06:55:07,171 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;@3afd2f76, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-09-01 06:55:07,171 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-09-01 06:55:07,190 INFO L130 PetriNetUnfolder]: 94/300 cut-off events. [2023-09-01 06:55:07,190 INFO L131 PetriNetUnfolder]: For 10/10 co-relation queries the response was YES. [2023-09-01 06:55:07,190 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-09-01 06:55:07,190 INFO L208 CegarLoopForPetriNet]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1] [2023-09-01 06:55:07,191 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-09-01 06:55:07,191 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-09-01 06:55:07,191 INFO L85 PathProgramCache]: Analyzing trace with hash 1463497936, now seen corresponding path program 1 times [2023-09-01 06:55:07,191 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-09-01 06:55:07,192 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1622152658] [2023-09-01 06:55:07,192 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-09-01 06:55:07,192 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-09-01 06:55:07,200 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-09-01 06:55:07,216 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 06:55:07,216 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-09-01 06:55:07,217 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1622152658] [2023-09-01 06:55:07,217 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1622152658] provided 1 perfect and 0 imperfect interpolant sequences [2023-09-01 06:55:07,217 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-09-01 06:55:07,217 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-09-01 06:55:07,217 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [706066322] [2023-09-01 06:55:07,218 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-09-01 06:55:07,218 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-09-01 06:55:07,218 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-09-01 06:55:07,219 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-09-01 06:55:07,219 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-09-01 06:55:07,229 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 374 out of 820 [2023-09-01 06:55:07,230 INFO L100 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 139 places, 198 transitions, 426 flow. Second operand has 3 states, 3 states have (on average 376.3333333333333) internal successors, (1129), 3 states have internal predecessors, (1129), 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 06:55:07,231 INFO L109 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-09-01 06:55:07,231 INFO L110 encePairwiseOnDemand]: Number of universal subtrahend loopers: 374 of 820 [2023-09-01 06:55:07,231 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand