./Ultimate.py --spec ../../../trunk/examples/svcomp/properties/unreach-call.prp --file ../../../trunk/examples/svcomp/goblint-regression/28-race_reach_05-lockfuns_racefree.i --full-output --traceabstraction.when.to.check.the.insufficient.erros.location.relative.to.the.other.error.locations AFTER --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability 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_05-lockfuns_racefree.i -s /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-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 ! call(reach_error())) ) --witnessprinter.graph.data.producer Automizer --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 1fe12ce8951e45860142b9cebaa325eef531c18fa917882c03ee5396afb187f5 --traceabstraction.when.to.check.the.insufficient.erros.location.relative.to.the.other.error.locations AFTER --- Real Ultimate output --- This is Ultimate 0.2.3-?-b8dbc81 [2023-08-30 17:45:22,614 INFO L177 SettingsManager]: Resetting all preferences to default values... [2023-08-30 17:45:22,616 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2023-08-30 17:45:22,656 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2023-08-30 17:45:22,656 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2023-08-30 17:45:22,659 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2023-08-30 17:45:22,661 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2023-08-30 17:45:22,663 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2023-08-30 17:45:22,665 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2023-08-30 17:45:22,670 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2023-08-30 17:45:22,670 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2023-08-30 17:45:22,673 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2023-08-30 17:45:22,673 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2023-08-30 17:45:22,675 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2023-08-30 17:45:22,676 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2023-08-30 17:45:22,679 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2023-08-30 17:45:22,680 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2023-08-30 17:45:22,682 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2023-08-30 17:45:22,683 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2023-08-30 17:45:22,688 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2023-08-30 17:45:22,697 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2023-08-30 17:45:22,698 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2023-08-30 17:45:22,699 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2023-08-30 17:45:22,700 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2023-08-30 17:45:22,707 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2023-08-30 17:45:22,707 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2023-08-30 17:45:22,708 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2023-08-30 17:45:22,709 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2023-08-30 17:45:22,710 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2023-08-30 17:45:22,711 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2023-08-30 17:45:22,711 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2023-08-30 17:45:22,713 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2023-08-30 17:45:22,714 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2023-08-30 17:45:22,715 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2023-08-30 17:45:22,716 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2023-08-30 17:45:22,716 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2023-08-30 17:45:22,717 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2023-08-30 17:45:22,717 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2023-08-30 17:45:22,717 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2023-08-30 17:45:22,718 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2023-08-30 17:45:22,719 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2023-08-30 17:45:22,720 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Default.epf [2023-08-30 17:45:22,753 INFO L113 SettingsManager]: Loading preferences was successful [2023-08-30 17:45:22,753 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2023-08-30 17:45:22,754 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-08-30 17:45:22,754 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-08-30 17:45:22,755 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-08-30 17:45:22,755 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-08-30 17:45:22,756 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2023-08-30 17:45:22,756 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2023-08-30 17:45:22,756 INFO L138 SettingsManager]: * Use SBE=true [2023-08-30 17:45:22,756 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-08-30 17:45:22,757 INFO L138 SettingsManager]: * sizeof long=4 [2023-08-30 17:45:22,757 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2023-08-30 17:45:22,758 INFO L138 SettingsManager]: * sizeof POINTER=4 [2023-08-30 17:45:22,758 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2023-08-30 17:45:22,758 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-08-30 17:45:22,758 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-08-30 17:45:22,758 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-08-30 17:45:22,758 INFO L138 SettingsManager]: * sizeof long double=12 [2023-08-30 17:45:22,759 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2023-08-30 17:45:22,759 INFO L138 SettingsManager]: * Use constant arrays=true [2023-08-30 17:45:22,759 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-08-30 17:45:22,759 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-08-30 17:45:22,759 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2023-08-30 17:45:22,760 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2023-08-30 17:45:22,760 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-08-30 17:45:22,760 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-08-30 17:45:22,760 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-08-30 17:45:22,761 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2023-08-30 17:45:22,761 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2023-08-30 17:45:22,761 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-08-30 17:45:22,761 INFO L138 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2023-08-30 17:45:22,761 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-08-30 17:45:22,762 INFO L138 SettingsManager]: * Order on configurations for Petri net unfoldings=DBO [2023-08-30 17:45:22,762 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-08-30 17:45:22,762 INFO L138 SettingsManager]: * Independence relation used for large block encoding in concurrent analysis=SYNTACTIC [2023-08-30 17:45:22,762 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 1fe12ce8951e45860142b9cebaa325eef531c18fa917882c03ee5396afb187f5 Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: When to check the insufficient erros location relative to the other error locations -> AFTER [2023-08-30 17:45:23,053 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-08-30 17:45:23,081 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-08-30 17:45:23,084 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-08-30 17:45:23,085 INFO L271 PluginConnector]: Initializing CDTParser... [2023-08-30 17:45:23,085 INFO L275 PluginConnector]: CDTParser initialized [2023-08-30 17:45:23,086 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/goblint-regression/28-race_reach_05-lockfuns_racefree.i [2023-08-30 17:45:24,371 INFO L500 CDTParser]: Created temporary CDT project at NULL [2023-08-30 17:45:24,624 INFO L351 CDTParser]: Found 1 translation units. [2023-08-30 17:45:24,626 INFO L172 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/goblint-regression/28-race_reach_05-lockfuns_racefree.i [2023-08-30 17:45:24,650 INFO L394 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ff8f573b4/af372baba62d4c419ae9233bafa8a4b2/FLAG4d9c1582c [2023-08-30 17:45:24,670 INFO L402 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ff8f573b4/af372baba62d4c419ae9233bafa8a4b2 [2023-08-30 17:45:24,673 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-08-30 17:45:24,674 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2023-08-30 17:45:24,677 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-08-30 17:45:24,677 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-08-30 17:45:24,680 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2023-08-30 17:45:24,681 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 30.08 05:45:24" (1/1) ... [2023-08-30 17:45:24,682 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@c898cbc and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.08 05:45:24, skipping insertion in model container [2023-08-30 17:45:24,682 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 30.08 05:45:24" (1/1) ... [2023-08-30 17:45:24,688 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2023-08-30 17:45:24,736 INFO L178 MainTranslator]: Built tables and reachable declarations [2023-08-30 17:45:25,045 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_05-lockfuns_racefree.i[30176,30189] [2023-08-30 17:45:25,067 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-08-30 17:45:25,081 INFO L203 MainTranslator]: Completed pre-run [2023-08-30 17:45:25,118 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_05-lockfuns_racefree.i[30176,30189] [2023-08-30 17:45:25,131 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-08-30 17:45:25,178 INFO L208 MainTranslator]: Completed translation [2023-08-30 17:45:25,178 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.08 05:45:25 WrapperNode [2023-08-30 17:45:25,178 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-08-30 17:45:25,179 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-08-30 17:45:25,179 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-08-30 17:45:25,179 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2023-08-30 17:45:25,184 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.08 05:45:25" (1/1) ... [2023-08-30 17:45:25,194 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.08 05:45:25" (1/1) ... [2023-08-30 17:45:25,213 INFO L138 Inliner]: procedures = 172, calls = 33, calls flagged for inlining = 7, calls inlined = 7, statements flattened = 106 [2023-08-30 17:45:25,213 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-08-30 17:45:25,214 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-08-30 17:45:25,214 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2023-08-30 17:45:25,214 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2023-08-30 17:45:25,219 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.08 05:45:25" (1/1) ... [2023-08-30 17:45:25,220 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.08 05:45:25" (1/1) ... [2023-08-30 17:45:25,223 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.08 05:45:25" (1/1) ... [2023-08-30 17:45:25,223 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.08 05:45:25" (1/1) ... [2023-08-30 17:45:25,228 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.08 05:45:25" (1/1) ... [2023-08-30 17:45:25,231 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.08 05:45:25" (1/1) ... [2023-08-30 17:45:25,233 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.08 05:45:25" (1/1) ... [2023-08-30 17:45:25,234 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.08 05:45:25" (1/1) ... [2023-08-30 17:45:25,236 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-08-30 17:45:25,237 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-08-30 17:45:25,237 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2023-08-30 17:45:25,238 INFO L275 PluginConnector]: RCFGBuilder initialized [2023-08-30 17:45:25,238 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.08 05:45:25" (1/1) ... [2023-08-30 17:45:25,243 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-08-30 17:45:25,263 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-30 17:45:25,275 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-08-30 17:45:25,299 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-08-30 17:45:25,311 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-08-30 17:45:25,311 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-08-30 17:45:25,311 INFO L130 BoogieDeclarations]: Found specification of procedure #PthreadsMutexLock [2023-08-30 17:45:25,311 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-08-30 17:45:25,312 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-08-30 17:45:25,312 INFO L130 BoogieDeclarations]: Found specification of procedure t_fun [2023-08-30 17:45:25,312 INFO L138 BoogieDeclarations]: Found implementation of procedure t_fun [2023-08-30 17:45:25,312 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-08-30 17:45:25,312 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-08-30 17:45:25,312 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-08-30 17:45:25,312 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-08-30 17:45:25,314 WARN L210 CfgBuilder]: User set CodeBlockSize to SequenceOfStatements but program contains fork statements. Overwriting the user preferences and setting CodeBlockSize to OneNontrivialStatement [2023-08-30 17:45:25,453 INFO L236 CfgBuilder]: Building ICFG [2023-08-30 17:45:25,462 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-08-30 17:45:25,633 INFO L277 CfgBuilder]: Performing block encoding [2023-08-30 17:45:25,639 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-08-30 17:45:25,639 INFO L302 CfgBuilder]: Removed 10 assume(true) statements. [2023-08-30 17:45:25,641 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 30.08 05:45:25 BoogieIcfgContainer [2023-08-30 17:45:25,642 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-08-30 17:45:25,644 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-08-30 17:45:25,644 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2023-08-30 17:45:25,647 INFO L275 PluginConnector]: TraceAbstraction initialized [2023-08-30 17:45:25,647 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 30.08 05:45:24" (1/3) ... [2023-08-30 17:45:25,647 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7c74735 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 30.08 05:45:25, skipping insertion in model container [2023-08-30 17:45:25,647 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.08 05:45:25" (2/3) ... [2023-08-30 17:45:25,648 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7c74735 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 30.08 05:45:25, skipping insertion in model container [2023-08-30 17:45:25,648 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 30.08 05:45:25" (3/3) ... [2023-08-30 17:45:25,649 INFO L112 eAbstractionObserver]: Analyzing ICFG 28-race_reach_05-lockfuns_racefree.i [2023-08-30 17:45:25,656 WARN L145 ceAbstractionStarter]: Switching off computation of Hoare annotation because input is a concurrent program [2023-08-30 17:45:25,664 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-08-30 17:45:25,665 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-08-30 17:45:25,665 INFO L515 ceAbstractionStarter]: Constructing petrified ICFG for 1 thread instances. [2023-08-30 17:45:25,753 INFO L144 ThreadInstanceAdder]: Constructed 1 joinOtherThreadTransitions. [2023-08-30 17:45:25,793 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 94 places, 103 transitions, 214 flow [2023-08-30 17:45:25,865 INFO L130 PetriNetUnfolder]: 17/138 cut-off events. [2023-08-30 17:45:25,865 INFO L131 PetriNetUnfolder]: For 1/1 co-relation queries the response was YES. [2023-08-30 17:45:25,870 INFO L83 FinitePrefix]: Finished finitePrefix Result has 144 conditions, 138 events. 17/138 cut-off events. For 1/1 co-relation queries the response was YES. Maximal size of possible extension queue 9. Compared 315 event pairs, 0 based on Foata normal form. 0/116 useless extension candidates. Maximal degree in co-relation 70. Up to 4 conditions per place. [2023-08-30 17:45:25,870 INFO L82 GeneralOperation]: Start removeDead. Operand has 94 places, 103 transitions, 214 flow [2023-08-30 17:45:25,876 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 90 places, 98 transitions, 201 flow [2023-08-30 17:45:25,879 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-30 17:45:25,892 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 90 places, 98 transitions, 201 flow [2023-08-30 17:45:25,896 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 90 places, 98 transitions, 201 flow [2023-08-30 17:45:25,896 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 90 places, 98 transitions, 201 flow [2023-08-30 17:45:25,939 INFO L130 PetriNetUnfolder]: 16/133 cut-off events. [2023-08-30 17:45:25,939 INFO L131 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2023-08-30 17:45:25,941 INFO L83 FinitePrefix]: Finished finitePrefix Result has 138 conditions, 133 events. 16/133 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 9. Compared 304 event pairs, 0 based on Foata normal form. 0/111 useless extension candidates. Maximal degree in co-relation 70. Up to 4 conditions per place. [2023-08-30 17:45:25,943 INFO L119 LiptonReduction]: Number of co-enabled transitions 2460 [2023-08-30 17:45:28,204 INFO L134 LiptonReduction]: Checked pairs total: 3508 [2023-08-30 17:45:28,204 INFO L136 LiptonReduction]: Total number of compositions: 81 [2023-08-30 17:45:28,216 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-08-30 17:45:28,221 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;@56867441, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-30 17:45:28,222 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-08-30 17:45:28,225 INFO L130 PetriNetUnfolder]: 1/11 cut-off events. [2023-08-30 17:45:28,225 INFO L131 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2023-08-30 17:45:28,225 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-30 17:45:28,226 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1] [2023-08-30 17:45:28,226 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-08-30 17:45:28,230 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-30 17:45:28,230 INFO L85 PathProgramCache]: Analyzing trace with hash 12455141, now seen corresponding path program 1 times [2023-08-30 17:45:28,238 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-30 17:45:28,238 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [308351504] [2023-08-30 17:45:28,239 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-30 17:45:28,239 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-30 17:45:28,317 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-30 17:45:28,416 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-30 17:45:28,416 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-30 17:45:28,417 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [308351504] [2023-08-30 17:45:28,417 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [308351504] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-30 17:45:28,417 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-30 17:45:28,418 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-08-30 17:45:28,419 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [915998471] [2023-08-30 17:45:28,419 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-30 17:45:28,426 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-30 17:45:28,431 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-30 17:45:28,451 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-30 17:45:28,452 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-30 17:45:28,472 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 85 out of 184 [2023-08-30 17:45:28,475 INFO L100 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 26 places, 32 transitions, 69 flow. Second operand has 3 states, 3 states have (on average 86.0) internal successors, (258), 3 states have internal predecessors, (258), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-30 17:45:28,475 INFO L109 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-30 17:45:28,475 INFO L110 encePairwiseOnDemand]: Number of universal subtrahend loopers: 85 of 184 [2023-08-30 17:45:28,476 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-30 17:45:28,540 INFO L130 PetriNetUnfolder]: 72/183 cut-off events. [2023-08-30 17:45:28,540 INFO L131 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2023-08-30 17:45:28,541 INFO L83 FinitePrefix]: Finished finitePrefix Result has 361 conditions, 183 events. 72/183 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 14. Compared 744 event pairs, 0 based on Foata normal form. 19/175 useless extension candidates. Maximal degree in co-relation 332. Up to 154 conditions per place. [2023-08-30 17:45:28,542 INFO L137 encePairwiseOnDemand]: 172/184 looper letters, 20 selfloop transitions, 2 changer transitions 7/31 dead transitions. [2023-08-30 17:45:28,542 INFO L142 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 27 places, 31 transitions, 123 flow [2023-08-30 17:45:28,544 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-30 17:45:28,546 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-30 17:45:28,557 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 299 transitions. [2023-08-30 17:45:28,561 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.5416666666666666 [2023-08-30 17:45:28,562 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 299 transitions. [2023-08-30 17:45:28,563 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 299 transitions. [2023-08-30 17:45:28,566 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-30 17:45:28,568 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 299 transitions. [2023-08-30 17:45:28,574 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 99.66666666666667) internal successors, (299), 3 states have internal predecessors, (299), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-30 17:45:28,578 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 184.0) internal successors, (736), 4 states have internal predecessors, (736), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-30 17:45:28,579 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 184.0) internal successors, (736), 4 states have internal predecessors, (736), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-30 17:45:28,580 INFO L175 Difference]: Start difference. First operand has 26 places, 32 transitions, 69 flow. Second operand 3 states and 299 transitions. [2023-08-30 17:45:28,581 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 27 places, 31 transitions, 123 flow [2023-08-30 17:45:28,583 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 27 places, 31 transitions, 123 flow, removed 0 selfloop flow, removed 0 redundant places. [2023-08-30 17:45:28,584 INFO L231 Difference]: Finished difference. Result has 28 places, 16 transitions, 43 flow [2023-08-30 17:45:28,585 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=184, PETRI_DIFFERENCE_MINUEND_FLOW=49, PETRI_DIFFERENCE_MINUEND_PLACES=25, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=22, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=2, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=20, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=43, PETRI_PLACES=28, PETRI_TRANSITIONS=16} [2023-08-30 17:45:28,589 INFO L281 CegarLoopForPetriNet]: 26 programPoint places, 2 predicate places. [2023-08-30 17:45:28,590 INFO L495 AbstractCegarLoop]: Abstraction has has 28 places, 16 transitions, 43 flow [2023-08-30 17:45:28,590 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 86.0) internal successors, (258), 3 states have internal predecessors, (258), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-30 17:45:28,590 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-30 17:45:28,590 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2023-08-30 17:45:28,591 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-08-30 17:45:28,591 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-08-30 17:45:28,595 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-30 17:45:28,595 INFO L85 PathProgramCache]: Analyzing trace with hash 1175566954, now seen corresponding path program 1 times [2023-08-30 17:45:28,595 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-30 17:45:28,596 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1799601393] [2023-08-30 17:45:28,596 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-30 17:45:28,596 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-30 17:45:28,618 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-30 17:45:28,681 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-30 17:45:28,681 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-30 17:45:28,682 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1799601393] [2023-08-30 17:45:28,682 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1799601393] provided 0 perfect and 1 imperfect interpolant sequences [2023-08-30 17:45:28,682 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1479927452] [2023-08-30 17:45:28,682 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-30 17:45:28,682 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-30 17:45:28,683 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-30 17:45:28,685 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-08-30 17:45:28,709 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-08-30 17:45:28,761 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-30 17:45:28,764 INFO L263 TraceCheckSpWp]: Trace formula consists of 110 conjuncts, 3 conjunts are in the unsatisfiable core [2023-08-30 17:45:28,767 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2023-08-30 17:45:28,806 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-30 17:45:28,807 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2023-08-30 17:45:28,824 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-30 17:45:28,825 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1479927452] provided 0 perfect and 2 imperfect interpolant sequences [2023-08-30 17:45:28,825 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-08-30 17:45:28,825 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 6 [2023-08-30 17:45:28,826 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1169835691] [2023-08-30 17:45:28,826 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-08-30 17:45:28,826 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-08-30 17:45:28,827 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-30 17:45:28,827 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-08-30 17:45:28,827 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2023-08-30 17:45:28,847 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 84 out of 184 [2023-08-30 17:45:28,849 INFO L100 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 28 places, 16 transitions, 43 flow. Second operand has 7 states, 7 states have (on average 86.14285714285714) internal successors, (603), 7 states have internal predecessors, (603), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-30 17:45:28,849 INFO L109 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-30 17:45:28,849 INFO L110 encePairwiseOnDemand]: Number of universal subtrahend loopers: 84 of 184 [2023-08-30 17:45:28,849 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-30 17:45:28,890 INFO L130 PetriNetUnfolder]: 16/46 cut-off events. [2023-08-30 17:45:28,891 INFO L131 PetriNetUnfolder]: For 8/8 co-relation queries the response was YES. [2023-08-30 17:45:28,891 INFO L83 FinitePrefix]: Finished finitePrefix Result has 117 conditions, 46 events. 16/46 cut-off events. For 8/8 co-relation queries the response was YES. Maximal size of possible extension queue 3. Compared 79 event pairs, 0 based on Foata normal form. 9/55 useless extension candidates. Maximal degree in co-relation 103. Up to 34 conditions per place. [2023-08-30 17:45:28,891 INFO L137 encePairwiseOnDemand]: 181/184 looper letters, 0 selfloop transitions, 0 changer transitions 22/22 dead transitions. [2023-08-30 17:45:28,904 INFO L142 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 22 places, 22 transitions, 95 flow [2023-08-30 17:45:28,905 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-08-30 17:45:28,905 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4 states. [2023-08-30 17:45:28,906 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4 states to 4 states and 358 transitions. [2023-08-30 17:45:28,907 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.48641304347826086 [2023-08-30 17:45:28,907 INFO L72 ComplementDD]: Start complementDD. Operand 4 states and 358 transitions. [2023-08-30 17:45:28,907 INFO L73 IsDeterministic]: Start isDeterministic. Operand 4 states and 358 transitions. [2023-08-30 17:45:28,907 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-30 17:45:28,907 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 4 states and 358 transitions. [2023-08-30 17:45:28,908 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 5 states, 4 states have (on average 89.5) internal successors, (358), 4 states have internal predecessors, (358), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-30 17:45:28,910 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 5 states, 5 states have (on average 184.0) internal successors, (920), 5 states have internal predecessors, (920), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-30 17:45:28,921 INFO L81 ComplementDD]: Finished complementDD. Result has 5 states, 5 states have (on average 184.0) internal successors, (920), 5 states have internal predecessors, (920), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-30 17:45:28,921 INFO L175 Difference]: Start difference. First operand has 28 places, 16 transitions, 43 flow. Second operand 4 states and 358 transitions. [2023-08-30 17:45:28,921 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 22 places, 22 transitions, 95 flow [2023-08-30 17:45:28,922 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 19 places, 22 transitions, 89 flow, removed 0 selfloop flow, removed 3 redundant places. [2023-08-30 17:45:28,922 INFO L231 Difference]: Finished difference. Result has 19 places, 0 transitions, 0 flow [2023-08-30 17:45:28,922 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=184, PETRI_DIFFERENCE_MINUEND_FLOW=29, PETRI_DIFFERENCE_MINUEND_PLACES=16, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=13, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=0, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=13, PETRI_DIFFERENCE_SUBTRAHEND_STATES=4, PETRI_FLOW=0, PETRI_PLACES=19, PETRI_TRANSITIONS=0} [2023-08-30 17:45:28,923 INFO L281 CegarLoopForPetriNet]: 26 programPoint places, -7 predicate places. [2023-08-30 17:45:28,923 INFO L495 AbstractCegarLoop]: Abstraction has has 19 places, 0 transitions, 0 flow [2023-08-30 17:45:28,924 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 86.14285714285714) internal successors, (603), 7 states have internal predecessors, (603), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-30 17:45:28,926 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION (0 of 1 remaining) [2023-08-30 17:45:28,946 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2023-08-30 17:45:29,132 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-30 17:45:29,133 INFO L445 BasicCegarLoop]: Path program histogram: [1, 1] [2023-08-30 17:45:29,135 INFO L307 ceAbstractionStarter]: Result for error location AllErrorsAtOnce was SAFE (1/2) [2023-08-30 17:45:29,138 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 94 places, 103 transitions, 214 flow [2023-08-30 17:45:29,149 INFO L130 PetriNetUnfolder]: 17/138 cut-off events. [2023-08-30 17:45:29,149 INFO L131 PetriNetUnfolder]: For 1/1 co-relation queries the response was YES. [2023-08-30 17:45:29,150 INFO L83 FinitePrefix]: Finished finitePrefix Result has 144 conditions, 138 events. 17/138 cut-off events. For 1/1 co-relation queries the response was YES. Maximal size of possible extension queue 9. Compared 315 event pairs, 0 based on Foata normal form. 0/116 useless extension candidates. Maximal degree in co-relation 70. Up to 4 conditions per place. [2023-08-30 17:45:29,150 INFO L82 GeneralOperation]: Start removeDead. Operand has 94 places, 103 transitions, 214 flow [2023-08-30 17:45:29,151 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 90 places, 98 transitions, 201 flow [2023-08-30 17:45:29,151 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-30 17:45:29,152 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 90 places, 98 transitions, 201 flow [2023-08-30 17:45:29,152 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 90 places, 98 transitions, 201 flow [2023-08-30 17:45:29,152 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 90 places, 98 transitions, 201 flow [2023-08-30 17:45:29,163 INFO L130 PetriNetUnfolder]: 16/133 cut-off events. [2023-08-30 17:45:29,164 INFO L131 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2023-08-30 17:45:29,165 INFO L83 FinitePrefix]: Finished finitePrefix Result has 138 conditions, 133 events. 16/133 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 9. Compared 304 event pairs, 0 based on Foata normal form. 0/111 useless extension candidates. Maximal degree in co-relation 70. Up to 4 conditions per place. [2023-08-30 17:45:29,166 INFO L119 LiptonReduction]: Number of co-enabled transitions 2460 [2023-08-30 17:45:31,092 INFO L134 LiptonReduction]: Checked pairs total: 3818 [2023-08-30 17:45:31,093 INFO L136 LiptonReduction]: Total number of compositions: 80 [2023-08-30 17:45:31,095 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == InUseError ======== [2023-08-30 17:45:31,096 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;@56867441, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-30 17:45:31,096 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-08-30 17:45:31,099 INFO L130 PetriNetUnfolder]: 2/19 cut-off events. [2023-08-30 17:45:31,099 INFO L131 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2023-08-30 17:45:31,099 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-30 17:45:31,099 INFO L208 CegarLoopForPetriNet]: trace histogram [2, 1, 1, 1, 1] [2023-08-30 17:45:31,100 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-08-30 17:45:31,100 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-30 17:45:31,100 INFO L85 PathProgramCache]: Analyzing trace with hash 1433307259, now seen corresponding path program 1 times [2023-08-30 17:45:31,100 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-30 17:45:31,101 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1631700886] [2023-08-30 17:45:31,101 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-30 17:45:31,101 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-30 17:45:31,120 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-30 17:45:31,121 INFO L356 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2023-08-30 17:45:31,132 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-30 17:45:31,154 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2023-08-30 17:45:31,154 INFO L360 BasicCegarLoop]: Counterexample is feasible [2023-08-30 17:45:31,155 INFO L805 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (0 of 1 remaining) [2023-08-30 17:45:31,155 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2023-08-30 17:45:31,155 INFO L445 BasicCegarLoop]: Path program histogram: [1] [2023-08-30 17:45:31,156 INFO L307 ceAbstractionStarter]: Result for error location InUseError was UNSAFE (2/2) [2023-08-30 17:45:31,156 WARN L233 ceAbstractionStarter]: 1 thread instances were not sufficient, I will increase this number and restart the analysis [2023-08-30 17:45:31,156 INFO L515 ceAbstractionStarter]: Constructing petrified ICFG for 2 thread instances. [2023-08-30 17:45:31,170 INFO L144 ThreadInstanceAdder]: Constructed 2 joinOtherThreadTransitions. [2023-08-30 17:45:31,172 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 121 places, 135 transitions, 288 flow [2023-08-30 17:45:31,191 INFO L130 PetriNetUnfolder]: 31/229 cut-off events. [2023-08-30 17:45:31,192 INFO L131 PetriNetUnfolder]: For 6/6 co-relation queries the response was YES. [2023-08-30 17:45:31,193 INFO L83 FinitePrefix]: Finished finitePrefix Result has 243 conditions, 229 events. 31/229 cut-off events. For 6/6 co-relation queries the response was YES. Maximal size of possible extension queue 11. Compared 669 event pairs, 0 based on Foata normal form. 0/191 useless extension candidates. Maximal degree in co-relation 140. Up to 8 conditions per place. [2023-08-30 17:45:31,194 INFO L82 GeneralOperation]: Start removeDead. Operand has 121 places, 135 transitions, 288 flow [2023-08-30 17:45:31,198 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 121 places, 135 transitions, 288 flow [2023-08-30 17:45:31,199 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-30 17:45:31,199 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 121 places, 135 transitions, 288 flow [2023-08-30 17:45:31,199 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 121 places, 135 transitions, 288 flow [2023-08-30 17:45:31,199 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 121 places, 135 transitions, 288 flow [2023-08-30 17:45:31,222 INFO L130 PetriNetUnfolder]: 31/229 cut-off events. [2023-08-30 17:45:31,222 INFO L131 PetriNetUnfolder]: For 6/6 co-relation queries the response was YES. [2023-08-30 17:45:31,225 INFO L83 FinitePrefix]: Finished finitePrefix Result has 243 conditions, 229 events. 31/229 cut-off events. For 6/6 co-relation queries the response was YES. Maximal size of possible extension queue 11. Compared 669 event pairs, 0 based on Foata normal form. 0/191 useless extension candidates. Maximal degree in co-relation 140. Up to 8 conditions per place. [2023-08-30 17:45:31,231 INFO L119 LiptonReduction]: Number of co-enabled transitions 7380 [2023-08-30 17:45:33,178 INFO L134 LiptonReduction]: Checked pairs total: 16879 [2023-08-30 17:45:33,178 INFO L136 LiptonReduction]: Total number of compositions: 97 [2023-08-30 17:45:33,180 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-08-30 17:45:33,181 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;@56867441, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-30 17:45:33,181 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-08-30 17:45:33,183 INFO L130 PetriNetUnfolder]: 1/11 cut-off events. [2023-08-30 17:45:33,183 INFO L131 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2023-08-30 17:45:33,183 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-30 17:45:33,183 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1] [2023-08-30 17:45:33,183 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-08-30 17:45:33,184 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-30 17:45:33,184 INFO L85 PathProgramCache]: Analyzing trace with hash 23040462, now seen corresponding path program 1 times [2023-08-30 17:45:33,184 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-30 17:45:33,184 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1880494056] [2023-08-30 17:45:33,185 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-30 17:45:33,185 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-30 17:45:33,195 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-30 17:45:33,222 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-30 17:45:33,222 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-30 17:45:33,222 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1880494056] [2023-08-30 17:45:33,223 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1880494056] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-30 17:45:33,223 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-30 17:45:33,223 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-08-30 17:45:33,223 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [10013661] [2023-08-30 17:45:33,223 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-30 17:45:33,224 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-30 17:45:33,224 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-30 17:45:33,224 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-30 17:45:33,225 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-30 17:45:33,234 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 109 out of 232 [2023-08-30 17:45:33,235 INFO L100 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 45 places, 57 transitions, 132 flow. Second operand has 3 states, 3 states have (on average 110.0) internal successors, (330), 3 states have internal predecessors, (330), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-30 17:45:33,235 INFO L109 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-30 17:45:33,235 INFO L110 encePairwiseOnDemand]: Number of universal subtrahend loopers: 109 of 232 [2023-08-30 17:45:33,235 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-30 17:45:33,498 INFO L130 PetriNetUnfolder]: 1490/2698 cut-off events. [2023-08-30 17:45:33,498 INFO L131 PetriNetUnfolder]: For 48/48 co-relation queries the response was YES. [2023-08-30 17:45:33,501 INFO L83 FinitePrefix]: Finished finitePrefix Result has 5210 conditions, 2698 events. 1490/2698 cut-off events. For 48/48 co-relation queries the response was YES. Maximal size of possible extension queue 109. Compared 16371 event pairs, 680 based on Foata normal form. 285/2685 useless extension candidates. Maximal degree in co-relation 535. Up to 2431 conditions per place. [2023-08-30 17:45:33,507 INFO L137 encePairwiseOnDemand]: 214/232 looper letters, 31 selfloop transitions, 2 changer transitions 10/51 dead transitions. [2023-08-30 17:45:33,529 INFO L142 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 46 places, 51 transitions, 202 flow [2023-08-30 17:45:33,533 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-30 17:45:33,533 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-30 17:45:33,535 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 390 transitions. [2023-08-30 17:45:33,535 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.5603448275862069 [2023-08-30 17:45:33,535 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 390 transitions. [2023-08-30 17:45:33,536 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 390 transitions. [2023-08-30 17:45:33,536 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-30 17:45:33,536 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 390 transitions. [2023-08-30 17:45:33,537 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 130.0) internal successors, (390), 3 states have internal predecessors, (390), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-30 17:45:33,540 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 232.0) internal successors, (928), 4 states have internal predecessors, (928), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-30 17:45:33,541 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 232.0) internal successors, (928), 4 states have internal predecessors, (928), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-30 17:45:33,541 INFO L175 Difference]: Start difference. First operand has 45 places, 57 transitions, 132 flow. Second operand 3 states and 390 transitions. [2023-08-30 17:45:33,542 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 46 places, 51 transitions, 202 flow [2023-08-30 17:45:33,544 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 46 places, 51 transitions, 202 flow, removed 0 selfloop flow, removed 0 redundant places. [2023-08-30 17:45:33,545 INFO L231 Difference]: Finished difference. Result has 47 places, 32 transitions, 82 flow [2023-08-30 17:45:33,545 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=232, PETRI_DIFFERENCE_MINUEND_FLOW=100, PETRI_DIFFERENCE_MINUEND_PLACES=44, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=41, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=39, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=82, PETRI_PLACES=47, PETRI_TRANSITIONS=32} [2023-08-30 17:45:33,548 INFO L281 CegarLoopForPetriNet]: 45 programPoint places, 2 predicate places. [2023-08-30 17:45:33,548 INFO L495 AbstractCegarLoop]: Abstraction has has 47 places, 32 transitions, 82 flow [2023-08-30 17:45:33,549 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 110.0) internal successors, (330), 3 states have internal predecessors, (330), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-30 17:45:33,549 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-30 17:45:33,549 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2023-08-30 17:45:33,549 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2023-08-30 17:45:33,551 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-08-30 17:45:33,552 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-30 17:45:33,552 INFO L85 PathProgramCache]: Analyzing trace with hash -251361210, now seen corresponding path program 1 times [2023-08-30 17:45:33,552 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-30 17:45:33,555 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1047942821] [2023-08-30 17:45:33,555 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-30 17:45:33,555 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-30 17:45:33,583 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-30 17:45:33,654 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-30 17:45:33,654 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-30 17:45:33,655 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1047942821] [2023-08-30 17:45:33,655 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1047942821] provided 0 perfect and 1 imperfect interpolant sequences [2023-08-30 17:45:33,655 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1196893904] [2023-08-30 17:45:33,655 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-30 17:45:33,656 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-30 17:45:33,656 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-30 17:45:33,657 INFO L229 MonitoredProcess]: Starting monitored process 3 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-08-30 17:45:33,666 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-08-30 17:45:33,728 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-30 17:45:33,730 INFO L263 TraceCheckSpWp]: Trace formula consists of 111 conjuncts, 3 conjunts are in the unsatisfiable core [2023-08-30 17:45:33,731 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2023-08-30 17:45:33,751 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-30 17:45:33,751 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2023-08-30 17:45:33,778 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-30 17:45:33,779 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1196893904] provided 0 perfect and 2 imperfect interpolant sequences [2023-08-30 17:45:33,779 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-08-30 17:45:33,779 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 6 [2023-08-30 17:45:33,779 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [146607417] [2023-08-30 17:45:33,779 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-08-30 17:45:33,780 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-08-30 17:45:33,781 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-30 17:45:33,781 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-08-30 17:45:33,782 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2023-08-30 17:45:33,808 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 108 out of 232 [2023-08-30 17:45:33,810 INFO L100 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 47 places, 32 transitions, 82 flow. Second operand has 7 states, 7 states have (on average 110.14285714285714) internal successors, (771), 7 states have internal predecessors, (771), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-30 17:45:33,810 INFO L109 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-30 17:45:33,810 INFO L110 encePairwiseOnDemand]: Number of universal subtrahend loopers: 108 of 232 [2023-08-30 17:45:33,810 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-30 17:45:33,927 INFO L130 PetriNetUnfolder]: 376/688 cut-off events. [2023-08-30 17:45:33,927 INFO L131 PetriNetUnfolder]: For 99/99 co-relation queries the response was YES. [2023-08-30 17:45:33,928 INFO L83 FinitePrefix]: Finished finitePrefix Result has 1471 conditions, 688 events. 376/688 cut-off events. For 99/99 co-relation queries the response was YES. Maximal size of possible extension queue 33. Compared 3189 event pairs, 0 based on Foata normal form. 90/778 useless extension candidates. Maximal degree in co-relation 163. Up to 450 conditions per place. [2023-08-30 17:45:33,929 INFO L137 encePairwiseOnDemand]: 229/232 looper letters, 0 selfloop transitions, 0 changer transitions 55/55 dead transitions. [2023-08-30 17:45:33,929 INFO L142 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 40 places, 55 transitions, 222 flow [2023-08-30 17:45:33,930 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-08-30 17:45:33,930 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5 states. [2023-08-30 17:45:33,931 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5 states to 5 states and 590 transitions. [2023-08-30 17:45:33,932 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.5086206896551724 [2023-08-30 17:45:33,932 INFO L72 ComplementDD]: Start complementDD. Operand 5 states and 590 transitions. [2023-08-30 17:45:33,932 INFO L73 IsDeterministic]: Start isDeterministic. Operand 5 states and 590 transitions. [2023-08-30 17:45:33,932 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-30 17:45:33,933 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 5 states and 590 transitions. [2023-08-30 17:45:33,934 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 6 states, 5 states have (on average 118.0) internal successors, (590), 5 states have internal predecessors, (590), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-30 17:45:33,936 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 6 states, 6 states have (on average 232.0) internal successors, (1392), 6 states have internal predecessors, (1392), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-30 17:45:33,937 INFO L81 ComplementDD]: Finished complementDD. Result has 6 states, 6 states have (on average 232.0) internal successors, (1392), 6 states have internal predecessors, (1392), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-30 17:45:33,937 INFO L175 Difference]: Start difference. First operand has 47 places, 32 transitions, 82 flow. Second operand 5 states and 590 transitions. [2023-08-30 17:45:33,937 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 40 places, 55 transitions, 222 flow [2023-08-30 17:45:33,939 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 39 places, 55 transitions, 220 flow, removed 0 selfloop flow, removed 1 redundant places. [2023-08-30 17:45:33,939 INFO L231 Difference]: Finished difference. Result has 39 places, 0 transitions, 0 flow [2023-08-30 17:45:33,940 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=232, PETRI_DIFFERENCE_MINUEND_FLOW=72, PETRI_DIFFERENCE_MINUEND_PLACES=35, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=29, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=0, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=29, PETRI_DIFFERENCE_SUBTRAHEND_STATES=5, PETRI_FLOW=0, PETRI_PLACES=39, PETRI_TRANSITIONS=0} [2023-08-30 17:45:33,942 INFO L281 CegarLoopForPetriNet]: 45 programPoint places, -6 predicate places. [2023-08-30 17:45:33,943 INFO L495 AbstractCegarLoop]: Abstraction has has 39 places, 0 transitions, 0 flow [2023-08-30 17:45:33,943 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 110.14285714285714) internal successors, (771), 7 states have internal predecessors, (771), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-30 17:45:33,945 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION (0 of 1 remaining) [2023-08-30 17:45:33,955 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-08-30 17:45:34,151 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-30 17:45:34,151 INFO L445 BasicCegarLoop]: Path program histogram: [1, 1] [2023-08-30 17:45:34,152 INFO L307 ceAbstractionStarter]: Result for error location AllErrorsAtOnce was SAFE (1/2) [2023-08-30 17:45:34,154 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 121 places, 135 transitions, 288 flow [2023-08-30 17:45:34,176 INFO L130 PetriNetUnfolder]: 31/229 cut-off events. [2023-08-30 17:45:34,176 INFO L131 PetriNetUnfolder]: For 6/6 co-relation queries the response was YES. [2023-08-30 17:45:34,178 INFO L83 FinitePrefix]: Finished finitePrefix Result has 243 conditions, 229 events. 31/229 cut-off events. For 6/6 co-relation queries the response was YES. Maximal size of possible extension queue 11. Compared 669 event pairs, 0 based on Foata normal form. 0/191 useless extension candidates. Maximal degree in co-relation 140. Up to 8 conditions per place. [2023-08-30 17:45:34,178 INFO L82 GeneralOperation]: Start removeDead. Operand has 121 places, 135 transitions, 288 flow [2023-08-30 17:45:34,179 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 121 places, 135 transitions, 288 flow [2023-08-30 17:45:34,179 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-30 17:45:34,179 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 121 places, 135 transitions, 288 flow [2023-08-30 17:45:34,180 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 121 places, 135 transitions, 288 flow [2023-08-30 17:45:34,180 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 121 places, 135 transitions, 288 flow [2023-08-30 17:45:34,196 INFO L130 PetriNetUnfolder]: 31/229 cut-off events. [2023-08-30 17:45:34,196 INFO L131 PetriNetUnfolder]: For 6/6 co-relation queries the response was YES. [2023-08-30 17:45:34,197 INFO L83 FinitePrefix]: Finished finitePrefix Result has 243 conditions, 229 events. 31/229 cut-off events. For 6/6 co-relation queries the response was YES. Maximal size of possible extension queue 11. Compared 669 event pairs, 0 based on Foata normal form. 0/191 useless extension candidates. Maximal degree in co-relation 140. Up to 8 conditions per place. [2023-08-30 17:45:34,201 INFO L119 LiptonReduction]: Number of co-enabled transitions 7380 [2023-08-30 17:45:36,147 INFO L134 LiptonReduction]: Checked pairs total: 17008 [2023-08-30 17:45:36,147 INFO L136 LiptonReduction]: Total number of compositions: 97 [2023-08-30 17:45:36,149 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == InUseError ======== [2023-08-30 17:45:36,149 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;@56867441, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-30 17:45:36,149 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-08-30 17:45:36,154 INFO L130 PetriNetUnfolder]: 12/58 cut-off events. [2023-08-30 17:45:36,154 INFO L131 PetriNetUnfolder]: For 3/3 co-relation queries the response was YES. [2023-08-30 17:45:36,154 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-30 17:45:36,154 INFO L208 CegarLoopForPetriNet]: trace histogram [3, 2, 2, 1, 1, 1, 1] [2023-08-30 17:45:36,154 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-08-30 17:45:36,155 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-30 17:45:36,155 INFO L85 PathProgramCache]: Analyzing trace with hash -1605213705, now seen corresponding path program 1 times [2023-08-30 17:45:36,155 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-30 17:45:36,155 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [547436322] [2023-08-30 17:45:36,156 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-30 17:45:36,156 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-30 17:45:36,169 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-30 17:45:36,170 INFO L356 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2023-08-30 17:45:36,177 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-30 17:45:36,183 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2023-08-30 17:45:36,183 INFO L360 BasicCegarLoop]: Counterexample is feasible [2023-08-30 17:45:36,183 INFO L805 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (0 of 1 remaining) [2023-08-30 17:45:36,183 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2023-08-30 17:45:36,184 INFO L445 BasicCegarLoop]: Path program histogram: [1] [2023-08-30 17:45:36,184 INFO L307 ceAbstractionStarter]: Result for error location InUseError was UNSAFE (2/2) [2023-08-30 17:45:36,184 WARN L233 ceAbstractionStarter]: 2 thread instances were not sufficient, I will increase this number and restart the analysis [2023-08-30 17:45:36,184 INFO L515 ceAbstractionStarter]: Constructing petrified ICFG for 3 thread instances. [2023-08-30 17:45:36,201 INFO L144 ThreadInstanceAdder]: Constructed 3 joinOtherThreadTransitions. [2023-08-30 17:45:36,203 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 148 places, 167 transitions, 364 flow [2023-08-30 17:45:36,239 INFO L130 PetriNetUnfolder]: 50/351 cut-off events. [2023-08-30 17:45:36,239 INFO L131 PetriNetUnfolder]: For 19/19 co-relation queries the response was YES. [2023-08-30 17:45:36,242 INFO L83 FinitePrefix]: Finished finitePrefix Result has 379 conditions, 351 events. 50/351 cut-off events. For 19/19 co-relation queries the response was YES. Maximal size of possible extension queue 13. Compared 1141 event pairs, 1 based on Foata normal form. 0/293 useless extension candidates. Maximal degree in co-relation 237. Up to 16 conditions per place. [2023-08-30 17:45:36,242 INFO L82 GeneralOperation]: Start removeDead. Operand has 148 places, 167 transitions, 364 flow [2023-08-30 17:45:36,244 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 148 places, 167 transitions, 364 flow [2023-08-30 17:45:36,245 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-30 17:45:36,245 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 148 places, 167 transitions, 364 flow [2023-08-30 17:45:36,245 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 148 places, 167 transitions, 364 flow [2023-08-30 17:45:36,245 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 148 places, 167 transitions, 364 flow [2023-08-30 17:45:36,272 INFO L130 PetriNetUnfolder]: 50/351 cut-off events. [2023-08-30 17:45:36,272 INFO L131 PetriNetUnfolder]: For 19/19 co-relation queries the response was YES. [2023-08-30 17:45:36,275 INFO L83 FinitePrefix]: Finished finitePrefix Result has 379 conditions, 351 events. 50/351 cut-off events. For 19/19 co-relation queries the response was YES. Maximal size of possible extension queue 13. Compared 1141 event pairs, 1 based on Foata normal form. 0/293 useless extension candidates. Maximal degree in co-relation 237. Up to 16 conditions per place. [2023-08-30 17:45:36,285 INFO L119 LiptonReduction]: Number of co-enabled transitions 14040 [2023-08-30 17:45:38,369 INFO L134 LiptonReduction]: Checked pairs total: 32860 [2023-08-30 17:45:38,369 INFO L136 LiptonReduction]: Total number of compositions: 114 [2023-08-30 17:45:38,371 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-08-30 17:45:38,371 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;@56867441, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-30 17:45:38,372 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-08-30 17:45:38,373 INFO L130 PetriNetUnfolder]: 1/11 cut-off events. [2023-08-30 17:45:38,374 INFO L131 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2023-08-30 17:45:38,374 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-30 17:45:38,374 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1] [2023-08-30 17:45:38,374 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-08-30 17:45:38,374 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-30 17:45:38,375 INFO L85 PathProgramCache]: Analyzing trace with hash 35659422, now seen corresponding path program 1 times [2023-08-30 17:45:38,375 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-30 17:45:38,375 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1934875172] [2023-08-30 17:45:38,375 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-30 17:45:38,375 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-30 17:45:38,387 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-30 17:45:38,420 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-30 17:45:38,420 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-30 17:45:38,420 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1934875172] [2023-08-30 17:45:38,421 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1934875172] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-30 17:45:38,421 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-30 17:45:38,421 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-08-30 17:45:38,421 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1516577051] [2023-08-30 17:45:38,422 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-30 17:45:38,422 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-30 17:45:38,422 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-30 17:45:38,422 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-30 17:45:38,423 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-30 17:45:38,432 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 133 out of 281 [2023-08-30 17:45:38,433 INFO L100 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 59 places, 76 transitions, 182 flow. Second operand has 3 states, 3 states have (on average 134.0) internal successors, (402), 3 states have internal predecessors, (402), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-30 17:45:38,433 INFO L109 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-30 17:45:38,433 INFO L110 encePairwiseOnDemand]: Number of universal subtrahend loopers: 133 of 281 [2023-08-30 17:45:38,433 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-30 17:45:40,596 INFO L130 PetriNetUnfolder]: 17109/26606 cut-off events. [2023-08-30 17:45:40,597 INFO L131 PetriNetUnfolder]: For 901/901 co-relation queries the response was YES. [2023-08-30 17:45:40,643 INFO L83 FinitePrefix]: Finished finitePrefix Result has 51561 conditions, 26606 events. 17109/26606 cut-off events. For 901/901 co-relation queries the response was YES. Maximal size of possible extension queue 773. Compared 193148 event pairs, 11041 based on Foata normal form. 5470/29701 useless extension candidates. Maximal degree in co-relation 4686. Up to 24302 conditions per place. [2023-08-30 17:45:40,711 INFO L137 encePairwiseOnDemand]: 257/281 looper letters, 37 selfloop transitions, 2 changer transitions 11/63 dead transitions. [2023-08-30 17:45:40,711 INFO L142 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 60 places, 63 transitions, 252 flow [2023-08-30 17:45:40,712 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-30 17:45:40,712 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-30 17:45:40,713 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 475 transitions. [2023-08-30 17:45:40,714 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.5634638196915777 [2023-08-30 17:45:40,714 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 475 transitions. [2023-08-30 17:45:40,714 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 475 transitions. [2023-08-30 17:45:40,714 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-30 17:45:40,714 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 475 transitions. [2023-08-30 17:45:40,716 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 158.33333333333334) internal successors, (475), 3 states have internal predecessors, (475), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-30 17:45:40,718 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 281.0) internal successors, (1124), 4 states have internal predecessors, (1124), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-30 17:45:40,720 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 281.0) internal successors, (1124), 4 states have internal predecessors, (1124), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-30 17:45:40,720 INFO L175 Difference]: Start difference. First operand has 59 places, 76 transitions, 182 flow. Second operand 3 states and 475 transitions. [2023-08-30 17:45:40,720 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 60 places, 63 transitions, 252 flow [2023-08-30 17:45:40,724 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 60 places, 63 transitions, 252 flow, removed 0 selfloop flow, removed 0 redundant places. [2023-08-30 17:45:40,725 INFO L231 Difference]: Finished difference. Result has 61 places, 44 transitions, 113 flow [2023-08-30 17:45:40,726 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=281, PETRI_DIFFERENCE_MINUEND_FLOW=138, PETRI_DIFFERENCE_MINUEND_PLACES=58, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=54, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=52, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=113, PETRI_PLACES=61, PETRI_TRANSITIONS=44} [2023-08-30 17:45:40,727 INFO L281 CegarLoopForPetriNet]: 59 programPoint places, 2 predicate places. [2023-08-30 17:45:40,727 INFO L495 AbstractCegarLoop]: Abstraction has has 61 places, 44 transitions, 113 flow [2023-08-30 17:45:40,727 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 134.0) internal successors, (402), 3 states have internal predecessors, (402), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-30 17:45:40,728 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-30 17:45:40,728 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2023-08-30 17:45:40,728 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2023-08-30 17:45:40,728 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-08-30 17:45:40,729 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-30 17:45:40,729 INFO L85 PathProgramCache]: Analyzing trace with hash -1949252324, now seen corresponding path program 1 times [2023-08-30 17:45:40,729 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-30 17:45:40,729 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1236156105] [2023-08-30 17:45:40,729 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-30 17:45:40,729 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-30 17:45:40,741 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-30 17:45:40,784 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-30 17:45:40,784 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-30 17:45:40,784 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1236156105] [2023-08-30 17:45:40,784 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1236156105] provided 0 perfect and 1 imperfect interpolant sequences [2023-08-30 17:45:40,785 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1554705480] [2023-08-30 17:45:40,785 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-30 17:45:40,785 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-30 17:45:40,785 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-30 17:45:40,789 INFO L229 MonitoredProcess]: Starting monitored process 4 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-08-30 17:45:40,790 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-08-30 17:45:40,849 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-30 17:45:40,850 INFO L263 TraceCheckSpWp]: Trace formula consists of 111 conjuncts, 3 conjunts are in the unsatisfiable core [2023-08-30 17:45:40,850 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2023-08-30 17:45:40,861 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-30 17:45:40,861 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2023-08-30 17:45:40,876 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-30 17:45:40,876 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1554705480] provided 0 perfect and 2 imperfect interpolant sequences [2023-08-30 17:45:40,876 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-08-30 17:45:40,876 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 6 [2023-08-30 17:45:40,877 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [555058763] [2023-08-30 17:45:40,877 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-08-30 17:45:40,877 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-08-30 17:45:40,877 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-30 17:45:40,878 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-08-30 17:45:40,878 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2023-08-30 17:45:40,895 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 132 out of 281 [2023-08-30 17:45:40,896 INFO L100 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 61 places, 44 transitions, 113 flow. Second operand has 7 states, 7 states have (on average 134.14285714285714) internal successors, (939), 7 states have internal predecessors, (939), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-30 17:45:40,896 INFO L109 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-30 17:45:40,896 INFO L110 encePairwiseOnDemand]: Number of universal subtrahend loopers: 132 of 281 [2023-08-30 17:45:40,896 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-30 17:45:41,409 INFO L130 PetriNetUnfolder]: 4342/6589 cut-off events. [2023-08-30 17:45:41,409 INFO L131 PetriNetUnfolder]: For 848/848 co-relation queries the response was YES. [2023-08-30 17:45:41,423 INFO L83 FinitePrefix]: Finished finitePrefix Result has 13823 conditions, 6589 events. 4342/6589 cut-off events. For 848/848 co-relation queries the response was YES. Maximal size of possible extension queue 223. Compared 38911 event pairs, 0 based on Foata normal form. 648/7236 useless extension candidates. Maximal degree in co-relation 1781. Up to 4192 conditions per place. [2023-08-30 17:45:41,430 INFO L137 encePairwiseOnDemand]: 278/281 looper letters, 0 selfloop transitions, 0 changer transitions 88/88 dead transitions. [2023-08-30 17:45:41,430 INFO L142 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 55 places, 88 transitions, 353 flow [2023-08-30 17:45:41,430 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-08-30 17:45:41,431 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6 states. [2023-08-30 17:45:41,432 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6 states to 6 states and 871 transitions. [2023-08-30 17:45:41,433 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.5166073546856464 [2023-08-30 17:45:41,433 INFO L72 ComplementDD]: Start complementDD. Operand 6 states and 871 transitions. [2023-08-30 17:45:41,433 INFO L73 IsDeterministic]: Start isDeterministic. Operand 6 states and 871 transitions. [2023-08-30 17:45:41,433 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-30 17:45:41,434 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 6 states and 871 transitions. [2023-08-30 17:45:41,435 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 7 states, 6 states have (on average 145.16666666666666) internal successors, (871), 6 states have internal predecessors, (871), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-30 17:45:41,438 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 7 states, 7 states have (on average 281.0) internal successors, (1967), 7 states have internal predecessors, (1967), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-30 17:45:41,438 INFO L81 ComplementDD]: Finished complementDD. Result has 7 states, 7 states have (on average 281.0) internal successors, (1967), 7 states have internal predecessors, (1967), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-30 17:45:41,438 INFO L175 Difference]: Start difference. First operand has 61 places, 44 transitions, 113 flow. Second operand 6 states and 871 transitions. [2023-08-30 17:45:41,438 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 55 places, 88 transitions, 353 flow [2023-08-30 17:45:41,441 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 54 places, 88 transitions, 349 flow, removed 1 selfloop flow, removed 1 redundant places. [2023-08-30 17:45:41,442 INFO L231 Difference]: Finished difference. Result has 54 places, 0 transitions, 0 flow [2023-08-30 17:45:41,442 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=281, PETRI_DIFFERENCE_MINUEND_FLOW=101, PETRI_DIFFERENCE_MINUEND_PLACES=49, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=41, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=0, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=41, PETRI_DIFFERENCE_SUBTRAHEND_STATES=6, PETRI_FLOW=0, PETRI_PLACES=54, PETRI_TRANSITIONS=0} [2023-08-30 17:45:41,444 INFO L281 CegarLoopForPetriNet]: 59 programPoint places, -5 predicate places. [2023-08-30 17:45:41,444 INFO L495 AbstractCegarLoop]: Abstraction has has 54 places, 0 transitions, 0 flow [2023-08-30 17:45:41,445 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 134.14285714285714) internal successors, (939), 7 states have internal predecessors, (939), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-30 17:45:41,445 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION (0 of 1 remaining) [2023-08-30 17:45:41,450 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2023-08-30 17:45:41,651 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-30 17:45:41,652 INFO L445 BasicCegarLoop]: Path program histogram: [1, 1] [2023-08-30 17:45:41,654 INFO L307 ceAbstractionStarter]: Result for error location AllErrorsAtOnce was SAFE (1/2) [2023-08-30 17:45:41,656 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 148 places, 167 transitions, 364 flow [2023-08-30 17:45:41,682 INFO L130 PetriNetUnfolder]: 50/351 cut-off events. [2023-08-30 17:45:41,683 INFO L131 PetriNetUnfolder]: For 19/19 co-relation queries the response was YES. [2023-08-30 17:45:41,685 INFO L83 FinitePrefix]: Finished finitePrefix Result has 379 conditions, 351 events. 50/351 cut-off events. For 19/19 co-relation queries the response was YES. Maximal size of possible extension queue 13. Compared 1141 event pairs, 1 based on Foata normal form. 0/293 useless extension candidates. Maximal degree in co-relation 237. Up to 16 conditions per place. [2023-08-30 17:45:41,685 INFO L82 GeneralOperation]: Start removeDead. Operand has 148 places, 167 transitions, 364 flow [2023-08-30 17:45:41,687 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 148 places, 167 transitions, 364 flow [2023-08-30 17:45:41,688 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-30 17:45:41,688 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 148 places, 167 transitions, 364 flow [2023-08-30 17:45:41,688 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 148 places, 167 transitions, 364 flow [2023-08-30 17:45:41,688 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 148 places, 167 transitions, 364 flow [2023-08-30 17:45:41,717 INFO L130 PetriNetUnfolder]: 50/351 cut-off events. [2023-08-30 17:45:41,718 INFO L131 PetriNetUnfolder]: For 19/19 co-relation queries the response was YES. [2023-08-30 17:45:41,720 INFO L83 FinitePrefix]: Finished finitePrefix Result has 379 conditions, 351 events. 50/351 cut-off events. For 19/19 co-relation queries the response was YES. Maximal size of possible extension queue 13. Compared 1141 event pairs, 1 based on Foata normal form. 0/293 useless extension candidates. Maximal degree in co-relation 237. Up to 16 conditions per place. [2023-08-30 17:45:41,729 INFO L119 LiptonReduction]: Number of co-enabled transitions 14040 [2023-08-30 17:45:43,863 INFO L134 LiptonReduction]: Checked pairs total: 33095 [2023-08-30 17:45:43,863 INFO L136 LiptonReduction]: Total number of compositions: 114 [2023-08-30 17:45:43,865 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == InUseError ======== [2023-08-30 17:45:43,865 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;@56867441, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-30 17:45:43,865 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-08-30 17:45:43,871 INFO L130 PetriNetUnfolder]: 22/95 cut-off events. [2023-08-30 17:45:43,871 INFO L131 PetriNetUnfolder]: For 10/10 co-relation queries the response was YES. [2023-08-30 17:45:43,872 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-30 17:45:43,872 INFO L208 CegarLoopForPetriNet]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1] [2023-08-30 17:45:43,872 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-08-30 17:45:43,872 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-30 17:45:43,872 INFO L85 PathProgramCache]: Analyzing trace with hash 721541400, now seen corresponding path program 1 times [2023-08-30 17:45:43,873 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-30 17:45:43,873 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2029481406] [2023-08-30 17:45:43,873 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-30 17:45:43,873 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-30 17:45:43,885 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-30 17:45:43,885 INFO L356 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2023-08-30 17:45:43,891 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-30 17:45:43,896 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2023-08-30 17:45:43,897 INFO L360 BasicCegarLoop]: Counterexample is feasible [2023-08-30 17:45:43,897 INFO L805 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (0 of 1 remaining) [2023-08-30 17:45:43,897 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2023-08-30 17:45:43,897 INFO L445 BasicCegarLoop]: Path program histogram: [1] [2023-08-30 17:45:43,898 INFO L307 ceAbstractionStarter]: Result for error location InUseError was UNSAFE (2/2) [2023-08-30 17:45:43,898 WARN L233 ceAbstractionStarter]: 3 thread instances were not sufficient, I will increase this number and restart the analysis [2023-08-30 17:45:43,898 INFO L515 ceAbstractionStarter]: Constructing petrified ICFG for 4 thread instances. [2023-08-30 17:45:43,916 INFO L144 ThreadInstanceAdder]: Constructed 4 joinOtherThreadTransitions. [2023-08-30 17:45:43,918 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 175 places, 199 transitions, 442 flow [2023-08-30 17:45:43,966 INFO L130 PetriNetUnfolder]: 81/537 cut-off events. [2023-08-30 17:45:43,967 INFO L131 PetriNetUnfolder]: For 48/48 co-relation queries the response was YES. [2023-08-30 17:45:43,971 INFO L83 FinitePrefix]: Finished finitePrefix Result has 592 conditions, 537 events. 81/537 cut-off events. For 48/48 co-relation queries the response was YES. Maximal size of possible extension queue 14. Compared 2013 event pairs, 6 based on Foata normal form. 0/451 useless extension candidates. Maximal degree in co-relation 371. Up to 32 conditions per place. [2023-08-30 17:45:43,972 INFO L82 GeneralOperation]: Start removeDead. Operand has 175 places, 199 transitions, 442 flow [2023-08-30 17:45:43,976 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 175 places, 199 transitions, 442 flow [2023-08-30 17:45:43,976 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-30 17:45:43,977 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 175 places, 199 transitions, 442 flow [2023-08-30 17:45:43,977 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 175 places, 199 transitions, 442 flow [2023-08-30 17:45:43,977 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 175 places, 199 transitions, 442 flow [2023-08-30 17:45:44,024 INFO L130 PetriNetUnfolder]: 81/537 cut-off events. [2023-08-30 17:45:44,024 INFO L131 PetriNetUnfolder]: For 48/48 co-relation queries the response was YES. [2023-08-30 17:45:44,029 INFO L83 FinitePrefix]: Finished finitePrefix Result has 592 conditions, 537 events. 81/537 cut-off events. For 48/48 co-relation queries the response was YES. Maximal size of possible extension queue 14. Compared 2013 event pairs, 6 based on Foata normal form. 0/451 useless extension candidates. Maximal degree in co-relation 371. Up to 32 conditions per place. [2023-08-30 17:45:44,040 INFO L119 LiptonReduction]: Number of co-enabled transitions 22680 [2023-08-30 17:45:46,125 INFO L134 LiptonReduction]: Checked pairs total: 57152 [2023-08-30 17:45:46,125 INFO L136 LiptonReduction]: Total number of compositions: 131 [2023-08-30 17:45:46,126 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-08-30 17:45:46,127 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;@56867441, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-30 17:45:46,127 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-08-30 17:45:46,128 INFO L130 PetriNetUnfolder]: 1/11 cut-off events. [2023-08-30 17:45:46,128 INFO L131 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2023-08-30 17:45:46,128 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-30 17:45:46,129 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1] [2023-08-30 17:45:46,129 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-08-30 17:45:46,129 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-30 17:45:46,129 INFO L85 PathProgramCache]: Analyzing trace with hash 50311085, now seen corresponding path program 1 times [2023-08-30 17:45:46,129 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-30 17:45:46,129 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1793239412] [2023-08-30 17:45:46,129 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-30 17:45:46,130 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-30 17:45:46,135 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-30 17:45:46,147 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-30 17:45:46,147 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-30 17:45:46,148 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1793239412] [2023-08-30 17:45:46,148 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1793239412] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-30 17:45:46,148 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-30 17:45:46,148 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-08-30 17:45:46,148 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1459714030] [2023-08-30 17:45:46,148 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-30 17:45:46,149 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-30 17:45:46,149 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-30 17:45:46,149 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-30 17:45:46,149 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-30 17:45:46,156 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 157 out of 330 [2023-08-30 17:45:46,157 INFO L100 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 73 places, 95 transitions, 234 flow. Second operand has 3 states, 3 states have (on average 158.0) internal successors, (474), 3 states have internal predecessors, (474), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-30 17:45:46,157 INFO L109 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-30 17:45:46,157 INFO L110 encePairwiseOnDemand]: Number of universal subtrahend loopers: 157 of 330 [2023-08-30 17:45:46,158 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-30 17:46:03,757 INFO L130 PetriNetUnfolder]: 192316/270845 cut-off events. [2023-08-30 17:46:03,758 INFO L131 PetriNetUnfolder]: For 12142/12142 co-relation queries the response was YES. [2023-08-30 17:46:04,270 INFO L83 FinitePrefix]: Finished finitePrefix Result has 530143 conditions, 270845 events. 192316/270845 cut-off events. For 12142/12142 co-relation queries the response was YES. Maximal size of possible extension queue 6436. Compared 2158486 event pairs, 141713 based on Foata normal form. 59754/310012 useless extension candidates. Maximal degree in co-relation 50857. Up to 252413 conditions per place. [2023-08-30 17:46:04,845 INFO L137 encePairwiseOnDemand]: 300/330 looper letters, 45 selfloop transitions, 2 changer transitions 12/76 dead transitions. [2023-08-30 17:46:04,845 INFO L142 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 74 places, 76 transitions, 310 flow [2023-08-30 17:46:04,845 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-30 17:46:04,846 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-30 17:46:04,847 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 562 transitions. [2023-08-30 17:46:04,847 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.5676767676767677 [2023-08-30 17:46:04,847 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 562 transitions. [2023-08-30 17:46:04,847 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 562 transitions. [2023-08-30 17:46:04,848 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-30 17:46:04,848 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 562 transitions. [2023-08-30 17:46:04,849 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 187.33333333333334) internal successors, (562), 3 states have internal predecessors, (562), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-30 17:46:04,850 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 330.0) internal successors, (1320), 4 states have internal predecessors, (1320), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-30 17:46:04,851 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 330.0) internal successors, (1320), 4 states have internal predecessors, (1320), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-30 17:46:04,851 INFO L175 Difference]: Start difference. First operand has 73 places, 95 transitions, 234 flow. Second operand 3 states and 562 transitions. [2023-08-30 17:46:04,851 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 74 places, 76 transitions, 310 flow [2023-08-30 17:46:04,854 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 74 places, 76 transitions, 310 flow, removed 0 selfloop flow, removed 0 redundant places. [2023-08-30 17:46:04,856 INFO L231 Difference]: Finished difference. Result has 75 places, 56 transitions, 146 flow [2023-08-30 17:46:04,856 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=330, PETRI_DIFFERENCE_MINUEND_FLOW=178, PETRI_DIFFERENCE_MINUEND_PLACES=72, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=67, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=65, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=146, PETRI_PLACES=75, PETRI_TRANSITIONS=56} [2023-08-30 17:46:04,856 INFO L281 CegarLoopForPetriNet]: 73 programPoint places, 2 predicate places. [2023-08-30 17:46:04,857 INFO L495 AbstractCegarLoop]: Abstraction has has 75 places, 56 transitions, 146 flow [2023-08-30 17:46:04,857 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 158.0) internal successors, (474), 3 states have internal predecessors, (474), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-30 17:46:04,857 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-30 17:46:04,857 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2023-08-30 17:46:04,857 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2023-08-30 17:46:04,858 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-08-30 17:46:04,858 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-30 17:46:04,858 INFO L85 PathProgramCache]: Analyzing trace with hash 1882376404, now seen corresponding path program 1 times [2023-08-30 17:46:04,858 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-30 17:46:04,858 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [968175753] [2023-08-30 17:46:04,858 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-30 17:46:04,858 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-30 17:46:04,867 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-30 17:46:04,895 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-30 17:46:04,896 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-30 17:46:04,896 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [968175753] [2023-08-30 17:46:04,896 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [968175753] provided 0 perfect and 1 imperfect interpolant sequences [2023-08-30 17:46:04,896 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [27682483] [2023-08-30 17:46:04,896 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-30 17:46:04,897 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-30 17:46:04,897 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-30 17:46:04,898 INFO L229 MonitoredProcess]: Starting monitored process 5 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-08-30 17:46:04,900 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-08-30 17:46:04,972 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-30 17:46:04,973 INFO L263 TraceCheckSpWp]: Trace formula consists of 111 conjuncts, 3 conjunts are in the unsatisfiable core [2023-08-30 17:46:04,973 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2023-08-30 17:46:04,986 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-30 17:46:04,986 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2023-08-30 17:46:05,003 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-30 17:46:05,003 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [27682483] provided 0 perfect and 2 imperfect interpolant sequences [2023-08-30 17:46:05,003 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-08-30 17:46:05,004 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 6 [2023-08-30 17:46:05,004 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2126967905] [2023-08-30 17:46:05,004 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-08-30 17:46:05,005 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-08-30 17:46:05,005 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-30 17:46:05,005 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-08-30 17:46:05,005 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2023-08-30 17:46:05,026 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 156 out of 330 [2023-08-30 17:46:05,028 INFO L100 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 75 places, 56 transitions, 146 flow. Second operand has 7 states, 7 states have (on average 158.14285714285714) internal successors, (1107), 7 states have internal predecessors, (1107), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-30 17:46:05,028 INFO L109 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-30 17:46:05,028 INFO L110 encePairwiseOnDemand]: Number of universal subtrahend loopers: 156 of 330 [2023-08-30 17:46:05,028 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-30 17:46:11,401 INFO L130 PetriNetUnfolder]: 79435/110674 cut-off events. [2023-08-30 17:46:11,401 INFO L131 PetriNetUnfolder]: For 13120/13120 co-relation queries the response was YES. [2023-08-30 17:46:11,612 INFO L83 FinitePrefix]: Finished finitePrefix Result has 227050 conditions, 110674 events. 79435/110674 cut-off events. For 13120/13120 co-relation queries the response was YES. Maximal size of possible extension queue 3067. Compared 798735 event pairs, 14400 based on Foata normal form. 584/110897 useless extension candidates. Maximal degree in co-relation 29138. Up to 61372 conditions per place. [2023-08-30 17:46:12,012 INFO L137 encePairwiseOnDemand]: 326/330 looper letters, 111 selfloop transitions, 5 changer transitions 1/134 dead transitions. [2023-08-30 17:46:12,012 INFO L142 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 72 places, 134 transitions, 540 flow [2023-08-30 17:46:12,012 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-08-30 17:46:12,012 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6 states. [2023-08-30 17:46:12,014 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6 states to 6 states and 1056 transitions. [2023-08-30 17:46:12,015 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.5333333333333333 [2023-08-30 17:46:12,015 INFO L72 ComplementDD]: Start complementDD. Operand 6 states and 1056 transitions. [2023-08-30 17:46:12,015 INFO L73 IsDeterministic]: Start isDeterministic. Operand 6 states and 1056 transitions. [2023-08-30 17:46:12,016 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-30 17:46:12,016 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 6 states and 1056 transitions. [2023-08-30 17:46:12,018 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 7 states, 6 states have (on average 176.0) internal successors, (1056), 6 states have internal predecessors, (1056), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-30 17:46:12,021 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 7 states, 7 states have (on average 330.0) internal successors, (2310), 7 states have internal predecessors, (2310), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-30 17:46:12,022 INFO L81 ComplementDD]: Finished complementDD. Result has 7 states, 7 states have (on average 330.0) internal successors, (2310), 7 states have internal predecessors, (2310), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-30 17:46:12,022 INFO L175 Difference]: Start difference. First operand has 75 places, 56 transitions, 146 flow. Second operand 6 states and 1056 transitions. [2023-08-30 17:46:12,022 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 72 places, 134 transitions, 540 flow [2023-08-30 17:46:12,025 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 71 places, 134 transitions, 532 flow, removed 3 selfloop flow, removed 1 redundant places. [2023-08-30 17:46:12,027 INFO L231 Difference]: Finished difference. Result has 75 places, 58 transitions, 172 flow [2023-08-30 17:46:12,027 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=330, PETRI_DIFFERENCE_MINUEND_FLOW=138, PETRI_DIFFERENCE_MINUEND_PLACES=66, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=56, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=3, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=53, PETRI_DIFFERENCE_SUBTRAHEND_STATES=6, PETRI_FLOW=172, PETRI_PLACES=75, PETRI_TRANSITIONS=58} [2023-08-30 17:46:12,027 INFO L281 CegarLoopForPetriNet]: 73 programPoint places, 2 predicate places. [2023-08-30 17:46:12,027 INFO L495 AbstractCegarLoop]: Abstraction has has 75 places, 58 transitions, 172 flow [2023-08-30 17:46:12,028 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 158.14285714285714) internal successors, (1107), 7 states have internal predecessors, (1107), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-30 17:46:12,028 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-30 17:46:12,028 INFO L208 CegarLoopForPetriNet]: trace histogram [4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1] [2023-08-30 17:46:12,036 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-08-30 17:46:12,233 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-30 17:46:12,234 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-08-30 17:46:12,234 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-30 17:46:12,234 INFO L85 PathProgramCache]: Analyzing trace with hash 1739113731, now seen corresponding path program 1 times [2023-08-30 17:46:12,234 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-30 17:46:12,234 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1519977254] [2023-08-30 17:46:12,234 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-30 17:46:12,235 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-30 17:46:12,244 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-30 17:46:12,318 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2023-08-30 17:46:12,319 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-30 17:46:12,319 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1519977254] [2023-08-30 17:46:12,319 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1519977254] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-30 17:46:12,319 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-30 17:46:12,319 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-30 17:46:12,320 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1500347312] [2023-08-30 17:46:12,322 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-30 17:46:12,322 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-30 17:46:12,323 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-30 17:46:12,323 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-30 17:46:12,323 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-30 17:46:12,340 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 152 out of 330 [2023-08-30 17:46:12,341 INFO L100 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 75 places, 58 transitions, 172 flow. Second operand has 3 states, 3 states have (on average 155.0) internal successors, (465), 3 states have internal predecessors, (465), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-30 17:46:12,341 INFO L109 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-30 17:46:12,341 INFO L110 encePairwiseOnDemand]: Number of universal subtrahend loopers: 152 of 330 [2023-08-30 17:46:12,341 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-30 17:46:19,678 INFO L130 PetriNetUnfolder]: 92716/125977 cut-off events. [2023-08-30 17:46:19,678 INFO L131 PetriNetUnfolder]: For 112884/112884 co-relation queries the response was YES. [2023-08-30 17:46:19,987 INFO L83 FinitePrefix]: Finished finitePrefix Result has 298983 conditions, 125977 events. 92716/125977 cut-off events. For 112884/112884 co-relation queries the response was YES. Maximal size of possible extension queue 3296. Compared 865333 event pairs, 49408 based on Foata normal form. 81/125844 useless extension candidates. Maximal degree in co-relation 231244. Up to 120205 conditions per place. [2023-08-30 17:46:20,428 INFO L137 encePairwiseOnDemand]: 324/330 looper letters, 60 selfloop transitions, 5 changer transitions 0/79 dead transitions. [2023-08-30 17:46:20,428 INFO L142 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 77 places, 79 transitions, 392 flow [2023-08-30 17:46:20,429 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-30 17:46:20,429 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-30 17:46:20,430 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 516 transitions. [2023-08-30 17:46:20,430 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.5212121212121212 [2023-08-30 17:46:20,430 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 516 transitions. [2023-08-30 17:46:20,431 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 516 transitions. [2023-08-30 17:46:20,431 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-30 17:46:20,431 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 516 transitions. [2023-08-30 17:46:20,432 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 172.0) internal successors, (516), 3 states have internal predecessors, (516), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-30 17:46:20,434 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 330.0) internal successors, (1320), 4 states have internal predecessors, (1320), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-30 17:46:20,434 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 330.0) internal successors, (1320), 4 states have internal predecessors, (1320), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-30 17:46:20,434 INFO L175 Difference]: Start difference. First operand has 75 places, 58 transitions, 172 flow. Second operand 3 states and 516 transitions. [2023-08-30 17:46:20,434 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 77 places, 79 transitions, 392 flow [2023-08-30 17:46:20,454 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 74 places, 79 transitions, 372 flow, removed 6 selfloop flow, removed 3 redundant places. [2023-08-30 17:46:20,455 INFO L231 Difference]: Finished difference. Result has 75 places, 62 transitions, 194 flow [2023-08-30 17:46:20,456 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=330, PETRI_DIFFERENCE_MINUEND_FLOW=161, PETRI_DIFFERENCE_MINUEND_PLACES=72, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=58, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=53, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=194, PETRI_PLACES=75, PETRI_TRANSITIONS=62} [2023-08-30 17:46:20,456 INFO L281 CegarLoopForPetriNet]: 73 programPoint places, 2 predicate places. [2023-08-30 17:46:20,456 INFO L495 AbstractCegarLoop]: Abstraction has has 75 places, 62 transitions, 194 flow [2023-08-30 17:46:20,457 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 155.0) internal successors, (465), 3 states have internal predecessors, (465), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-30 17:46:20,457 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-30 17:46:20,457 INFO L208 CegarLoopForPetriNet]: trace histogram [4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-08-30 17:46:20,457 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2023-08-30 17:46:20,457 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-08-30 17:46:20,458 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-30 17:46:20,458 INFO L85 PathProgramCache]: Analyzing trace with hash -1967241273, now seen corresponding path program 1 times [2023-08-30 17:46:20,458 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-30 17:46:20,458 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1444664937] [2023-08-30 17:46:20,458 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-30 17:46:20,458 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-30 17:46:20,482 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-30 17:46:20,561 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-30 17:46:20,562 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-30 17:46:20,562 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1444664937] [2023-08-30 17:46:20,562 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1444664937] provided 0 perfect and 1 imperfect interpolant sequences [2023-08-30 17:46:20,562 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1884907183] [2023-08-30 17:46:20,562 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-30 17:46:20,563 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-30 17:46:20,563 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-30 17:46:20,565 INFO L229 MonitoredProcess]: Starting monitored process 6 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-08-30 17:46:20,567 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-08-30 17:46:20,653 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-30 17:46:20,654 INFO L263 TraceCheckSpWp]: Trace formula consists of 188 conjuncts, 6 conjunts are in the unsatisfiable core [2023-08-30 17:46:20,655 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2023-08-30 17:46:20,698 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-30 17:46:20,699 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2023-08-30 17:46:20,769 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-30 17:46:20,769 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1884907183] provided 0 perfect and 2 imperfect interpolant sequences [2023-08-30 17:46:20,770 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-08-30 17:46:20,770 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 12 [2023-08-30 17:46:20,770 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [40251591] [2023-08-30 17:46:20,770 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-08-30 17:46:20,770 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2023-08-30 17:46:20,771 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-30 17:46:20,771 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2023-08-30 17:46:20,772 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=78, Unknown=0, NotChecked=0, Total=156 [2023-08-30 17:46:20,806 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 156 out of 330 [2023-08-30 17:46:20,809 INFO L100 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 75 places, 62 transitions, 194 flow. Second operand has 13 states, 13 states have (on average 158.84615384615384) internal successors, (2065), 13 states have internal predecessors, (2065), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-30 17:46:20,809 INFO L109 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-30 17:46:20,809 INFO L110 encePairwiseOnDemand]: Number of universal subtrahend loopers: 156 of 330 [2023-08-30 17:46:20,809 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-30 17:46:24,308 INFO L130 PetriNetUnfolder]: 37738/54641 cut-off events. [2023-08-30 17:46:24,308 INFO L131 PetriNetUnfolder]: For 66593/66593 co-relation queries the response was YES. [2023-08-30 17:46:24,437 INFO L83 FinitePrefix]: Finished finitePrefix Result has 118509 conditions, 54641 events. 37738/54641 cut-off events. For 66593/66593 co-relation queries the response was YES. Maximal size of possible extension queue 1631. Compared 391751 event pairs, 4596 based on Foata normal form. 5562/59668 useless extension candidates. Maximal degree in co-relation 79622. Up to 24708 conditions per place. [2023-08-30 17:46:24,464 INFO L137 encePairwiseOnDemand]: 327/330 looper letters, 0 selfloop transitions, 0 changer transitions 138/138 dead transitions. [2023-08-30 17:46:24,464 INFO L142 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 78 places, 138 transitions, 602 flow [2023-08-30 17:46:24,464 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-08-30 17:46:24,464 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7 states. [2023-08-30 17:46:24,467 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7 states to 7 states and 1207 transitions. [2023-08-30 17:46:24,467 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.5225108225108225 [2023-08-30 17:46:24,467 INFO L72 ComplementDD]: Start complementDD. Operand 7 states and 1207 transitions. [2023-08-30 17:46:24,468 INFO L73 IsDeterministic]: Start isDeterministic. Operand 7 states and 1207 transitions. [2023-08-30 17:46:24,468 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-30 17:46:24,469 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 7 states and 1207 transitions. [2023-08-30 17:46:24,471 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 8 states, 7 states have (on average 172.42857142857142) internal successors, (1207), 7 states have internal predecessors, (1207), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-30 17:46:24,474 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 8 states, 8 states have (on average 330.0) internal successors, (2640), 8 states have internal predecessors, (2640), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-30 17:46:24,475 INFO L81 ComplementDD]: Finished complementDD. Result has 8 states, 8 states have (on average 330.0) internal successors, (2640), 8 states have internal predecessors, (2640), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-30 17:46:24,475 INFO L175 Difference]: Start difference. First operand has 75 places, 62 transitions, 194 flow. Second operand 7 states and 1207 transitions. [2023-08-30 17:46:24,475 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 78 places, 138 transitions, 602 flow [2023-08-30 17:46:24,489 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 73 places, 138 transitions, 585 flow, removed 0 selfloop flow, removed 5 redundant places. [2023-08-30 17:46:24,493 INFO L231 Difference]: Finished difference. Result has 73 places, 0 transitions, 0 flow [2023-08-30 17:46:24,493 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=330, PETRI_DIFFERENCE_MINUEND_FLOW=165, PETRI_DIFFERENCE_MINUEND_PLACES=67, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=59, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=0, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=59, PETRI_DIFFERENCE_SUBTRAHEND_STATES=7, PETRI_FLOW=0, PETRI_PLACES=73, PETRI_TRANSITIONS=0} [2023-08-30 17:46:24,494 INFO L281 CegarLoopForPetriNet]: 73 programPoint places, 0 predicate places. [2023-08-30 17:46:24,494 INFO L495 AbstractCegarLoop]: Abstraction has has 73 places, 0 transitions, 0 flow [2023-08-30 17:46:24,494 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 158.84615384615384) internal successors, (2065), 13 states have internal predecessors, (2065), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-30 17:46:24,495 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION (0 of 1 remaining) [2023-08-30 17:46:24,501 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2023-08-30 17:46:24,701 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2023-08-30 17:46:24,701 INFO L445 BasicCegarLoop]: Path program histogram: [1, 1, 1, 1] [2023-08-30 17:46:24,702 INFO L307 ceAbstractionStarter]: Result for error location AllErrorsAtOnce was SAFE (1/2) [2023-08-30 17:46:24,704 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 175 places, 199 transitions, 442 flow [2023-08-30 17:46:24,755 INFO L130 PetriNetUnfolder]: 81/537 cut-off events. [2023-08-30 17:46:24,755 INFO L131 PetriNetUnfolder]: For 48/48 co-relation queries the response was YES. [2023-08-30 17:46:24,758 INFO L83 FinitePrefix]: Finished finitePrefix Result has 592 conditions, 537 events. 81/537 cut-off events. For 48/48 co-relation queries the response was YES. Maximal size of possible extension queue 14. Compared 2013 event pairs, 6 based on Foata normal form. 0/451 useless extension candidates. Maximal degree in co-relation 371. Up to 32 conditions per place. [2023-08-30 17:46:24,758 INFO L82 GeneralOperation]: Start removeDead. Operand has 175 places, 199 transitions, 442 flow [2023-08-30 17:46:24,761 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 175 places, 199 transitions, 442 flow [2023-08-30 17:46:24,761 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-30 17:46:24,761 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 175 places, 199 transitions, 442 flow [2023-08-30 17:46:24,761 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 175 places, 199 transitions, 442 flow [2023-08-30 17:46:24,762 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 175 places, 199 transitions, 442 flow [2023-08-30 17:46:24,814 INFO L130 PetriNetUnfolder]: 81/537 cut-off events. [2023-08-30 17:46:24,814 INFO L131 PetriNetUnfolder]: For 48/48 co-relation queries the response was YES. [2023-08-30 17:46:24,818 INFO L83 FinitePrefix]: Finished finitePrefix Result has 592 conditions, 537 events. 81/537 cut-off events. For 48/48 co-relation queries the response was YES. Maximal size of possible extension queue 14. Compared 2013 event pairs, 6 based on Foata normal form. 0/451 useless extension candidates. Maximal degree in co-relation 371. Up to 32 conditions per place. [2023-08-30 17:46:24,830 INFO L119 LiptonReduction]: Number of co-enabled transitions 22680 [2023-08-30 17:46:26,960 INFO L134 LiptonReduction]: Checked pairs total: 56755 [2023-08-30 17:46:26,960 INFO L136 LiptonReduction]: Total number of compositions: 129 [2023-08-30 17:46:26,961 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == InUseError ======== [2023-08-30 17:46:26,961 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;@56867441, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-30 17:46:26,961 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-08-30 17:46:26,969 INFO L130 PetriNetUnfolder]: 33/138 cut-off events. [2023-08-30 17:46:26,969 INFO L131 PetriNetUnfolder]: For 23/23 co-relation queries the response was YES. [2023-08-30 17:46:26,969 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-30 17:46:26,969 INFO L208 CegarLoopForPetriNet]: trace histogram [5, 4, 4, 1, 1, 1, 1, 1, 1] [2023-08-30 17:46:26,969 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-08-30 17:46:26,969 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-30 17:46:26,969 INFO L85 PathProgramCache]: Analyzing trace with hash -780805335, now seen corresponding path program 1 times [2023-08-30 17:46:26,970 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-30 17:46:26,970 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1932620957] [2023-08-30 17:46:26,970 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-30 17:46:26,970 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-30 17:46:26,988 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-30 17:46:26,988 INFO L356 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2023-08-30 17:46:26,995 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-30 17:46:27,000 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2023-08-30 17:46:27,000 INFO L360 BasicCegarLoop]: Counterexample is feasible [2023-08-30 17:46:27,000 INFO L805 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (0 of 1 remaining) [2023-08-30 17:46:27,000 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2023-08-30 17:46:27,001 INFO L445 BasicCegarLoop]: Path program histogram: [1] [2023-08-30 17:46:27,001 INFO L307 ceAbstractionStarter]: Result for error location InUseError was UNSAFE (2/2) [2023-08-30 17:46:27,001 WARN L233 ceAbstractionStarter]: 4 thread instances were not sufficient, I will increase this number and restart the analysis [2023-08-30 17:46:27,001 INFO L515 ceAbstractionStarter]: Constructing petrified ICFG for 5 thread instances. [2023-08-30 17:46:27,029 INFO L144 ThreadInstanceAdder]: Constructed 5 joinOtherThreadTransitions. [2023-08-30 17:46:27,032 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 202 places, 231 transitions, 522 flow [2023-08-30 17:46:27,118 INFO L130 PetriNetUnfolder]: 140/855 cut-off events. [2023-08-30 17:46:27,118 INFO L131 PetriNetUnfolder]: For 110/110 co-relation queries the response was YES. [2023-08-30 17:46:27,127 INFO L83 FinitePrefix]: Finished finitePrefix Result has 966 conditions, 855 events. 140/855 cut-off events. For 110/110 co-relation queries the response was YES. Maximal size of possible extension queue 16. Compared 3770 event pairs, 23 based on Foata normal form. 0/725 useless extension candidates. Maximal degree in co-relation 582. Up to 80 conditions per place. [2023-08-30 17:46:27,127 INFO L82 GeneralOperation]: Start removeDead. Operand has 202 places, 231 transitions, 522 flow [2023-08-30 17:46:27,132 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 202 places, 231 transitions, 522 flow [2023-08-30 17:46:27,132 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-30 17:46:27,132 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 202 places, 231 transitions, 522 flow [2023-08-30 17:46:27,132 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 202 places, 231 transitions, 522 flow [2023-08-30 17:46:27,132 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 202 places, 231 transitions, 522 flow [2023-08-30 17:46:27,214 INFO L130 PetriNetUnfolder]: 140/855 cut-off events. [2023-08-30 17:46:27,214 INFO L131 PetriNetUnfolder]: For 110/110 co-relation queries the response was YES. [2023-08-30 17:46:27,220 INFO L83 FinitePrefix]: Finished finitePrefix Result has 966 conditions, 855 events. 140/855 cut-off events. For 110/110 co-relation queries the response was YES. Maximal size of possible extension queue 16. Compared 3770 event pairs, 23 based on Foata normal form. 0/725 useless extension candidates. Maximal degree in co-relation 582. Up to 80 conditions per place. [2023-08-30 17:46:27,242 INFO L119 LiptonReduction]: Number of co-enabled transitions 33300 [2023-08-30 17:46:29,223 INFO L134 LiptonReduction]: Checked pairs total: 85320 [2023-08-30 17:46:29,224 INFO L136 LiptonReduction]: Total number of compositions: 146 [2023-08-30 17:46:29,229 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-08-30 17:46:29,230 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;@56867441, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-30 17:46:29,230 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-08-30 17:46:29,232 INFO L130 PetriNetUnfolder]: 1/11 cut-off events. [2023-08-30 17:46:29,232 INFO L131 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2023-08-30 17:46:29,232 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-30 17:46:29,232 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1] [2023-08-30 17:46:29,232 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-08-30 17:46:29,232 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-30 17:46:29,233 INFO L85 PathProgramCache]: Analyzing trace with hash 66869503, now seen corresponding path program 1 times [2023-08-30 17:46:29,233 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-30 17:46:29,233 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1230909646] [2023-08-30 17:46:29,233 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-30 17:46:29,233 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-30 17:46:29,238 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-30 17:46:29,249 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-30 17:46:29,250 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-30 17:46:29,250 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1230909646] [2023-08-30 17:46:29,250 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1230909646] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-30 17:46:29,250 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-30 17:46:29,250 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-08-30 17:46:29,250 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2140389938] [2023-08-30 17:46:29,250 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-30 17:46:29,251 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-30 17:46:29,251 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-30 17:46:29,251 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-30 17:46:29,251 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-30 17:46:29,260 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 181 out of 377 [2023-08-30 17:46:29,261 INFO L100 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 87 places, 114 transitions, 288 flow. Second operand has 3 states, 3 states have (on average 182.0) internal successors, (546), 3 states have internal predecessors, (546), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-30 17:46:29,261 INFO L109 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-30 17:46:29,261 INFO L110 encePairwiseOnDemand]: Number of universal subtrahend loopers: 181 of 377 [2023-08-30 17:46:29,261 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand