/usr/bin/java -Xmx16000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data -s ../../../trunk/examples/settings/automizer/concurrent/svcomp-Reach-32bit-Automizer_Default-noMmResRef-PN-VariableLbe.epf --traceabstraction.when.to.check.the.insufficient.erros.location.relative.to.the.other.error.locations AFTER -tc ../../../trunk/examples/toolchains/AutomizerCInline.xml -i ../../../trunk/examples/svcomp/goblint-regression/28-race_reach_02-simple_racefree.i -------------------------------------------------------------------------------- This is Ultimate 0.2.3-dev-b8dbc81 [2023-01-28 07:44:03,741 INFO L177 SettingsManager]: Resetting all preferences to default values... [2023-01-28 07:44:03,743 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2023-01-28 07:44:03,777 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2023-01-28 07:44:03,777 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2023-01-28 07:44:03,779 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2023-01-28 07:44:03,782 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2023-01-28 07:44:03,784 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2023-01-28 07:44:03,785 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2023-01-28 07:44:03,789 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2023-01-28 07:44:03,790 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2023-01-28 07:44:03,792 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2023-01-28 07:44:03,792 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2023-01-28 07:44:03,794 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2023-01-28 07:44:03,795 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2023-01-28 07:44:03,796 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2023-01-28 07:44:03,797 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2023-01-28 07:44:03,797 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2023-01-28 07:44:03,799 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2023-01-28 07:44:03,803 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2023-01-28 07:44:03,804 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2023-01-28 07:44:03,805 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2023-01-28 07:44:03,806 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2023-01-28 07:44:03,807 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2023-01-28 07:44:03,814 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2023-01-28 07:44:03,814 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2023-01-28 07:44:03,815 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2023-01-28 07:44:03,816 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2023-01-28 07:44:03,816 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2023-01-28 07:44:03,817 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2023-01-28 07:44:03,817 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2023-01-28 07:44:03,817 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2023-01-28 07:44:03,818 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2023-01-28 07:44:03,819 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2023-01-28 07:44:03,819 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2023-01-28 07:44:03,820 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2023-01-28 07:44:03,820 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2023-01-28 07:44:03,820 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2023-01-28 07:44:03,820 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2023-01-28 07:44:03,821 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2023-01-28 07:44:03,821 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2023-01-28 07:44:03,823 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/concurrent/svcomp-Reach-32bit-Automizer_Default-noMmResRef-PN-VariableLbe.epf [2023-01-28 07:44:03,852 INFO L113 SettingsManager]: Loading preferences was successful [2023-01-28 07:44:03,852 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2023-01-28 07:44:03,853 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-01-28 07:44:03,853 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-01-28 07:44:03,854 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2023-01-28 07:44:03,854 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2023-01-28 07:44:03,854 INFO L138 SettingsManager]: * Use SBE=true [2023-01-28 07:44:03,854 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-01-28 07:44:03,854 INFO L138 SettingsManager]: * sizeof long=4 [2023-01-28 07:44:03,854 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2023-01-28 07:44:03,855 INFO L138 SettingsManager]: * sizeof POINTER=4 [2023-01-28 07:44:03,855 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2023-01-28 07:44:03,855 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-01-28 07:44:03,855 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-01-28 07:44:03,856 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-01-28 07:44:03,856 INFO L138 SettingsManager]: * sizeof long double=12 [2023-01-28 07:44:03,856 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2023-01-28 07:44:03,856 INFO L138 SettingsManager]: * Use constant arrays=true [2023-01-28 07:44:03,856 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-01-28 07:44:03,856 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-01-28 07:44:03,856 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2023-01-28 07:44:03,856 INFO L138 SettingsManager]: * To the following directory=./dump/ [2023-01-28 07:44:03,857 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2023-01-28 07:44:03,857 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-01-28 07:44:03,857 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-01-28 07:44:03,857 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-01-28 07:44:03,857 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2023-01-28 07:44:03,857 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2023-01-28 07:44:03,857 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-01-28 07:44:03,857 INFO L138 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2023-01-28 07:44:03,857 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-01-28 07:44:03,858 INFO L138 SettingsManager]: * Independence relation used for large block encoding in concurrent analysis=SYNTACTIC 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: When to check the insufficient erros location relative to the other error locations -> AFTER [2023-01-28 07:44:04,085 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-01-28 07:44:04,106 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-01-28 07:44:04,108 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-01-28 07:44:04,109 INFO L271 PluginConnector]: Initializing CDTParser... [2023-01-28 07:44:04,110 INFO L275 PluginConnector]: CDTParser initialized [2023-01-28 07:44:04,110 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/goblint-regression/28-race_reach_02-simple_racefree.i [2023-01-28 07:44:05,217 INFO L500 CDTParser]: Created temporary CDT project at NULL [2023-01-28 07:44:05,426 INFO L351 CDTParser]: Found 1 translation units. [2023-01-28 07:44:05,427 INFO L172 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/goblint-regression/28-race_reach_02-simple_racefree.i [2023-01-28 07:44:05,436 INFO L394 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ed4050708/8efb6922bf434efaba922d48f9dffe0e/FLAGa06b405a8 [2023-01-28 07:44:05,447 INFO L402 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ed4050708/8efb6922bf434efaba922d48f9dffe0e [2023-01-28 07:44:05,449 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-01-28 07:44:05,450 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2023-01-28 07:44:05,451 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-01-28 07:44:05,451 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-01-28 07:44:05,453 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2023-01-28 07:44:05,453 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 28.01 07:44:05" (1/1) ... [2023-01-28 07:44:05,454 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@16bf56df and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.01 07:44:05, skipping insertion in model container [2023-01-28 07:44:05,454 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 28.01 07:44:05" (1/1) ... [2023-01-28 07:44:05,460 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2023-01-28 07:44:05,497 INFO L178 MainTranslator]: Built tables and reachable declarations [2023-01-28 07:44:05,788 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_02-simple_racefree.i[30176,30189] [2023-01-28 07:44:05,809 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-01-28 07:44:05,822 INFO L203 MainTranslator]: Completed pre-run [2023-01-28 07:44:05,846 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_02-simple_racefree.i[30176,30189] [2023-01-28 07:44:05,851 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-01-28 07:44:05,880 INFO L208 MainTranslator]: Completed translation [2023-01-28 07:44:05,881 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.01 07:44:05 WrapperNode [2023-01-28 07:44:05,881 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-01-28 07:44:05,882 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-01-28 07:44:05,882 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-01-28 07:44:05,882 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2023-01-28 07:44:05,888 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.01 07:44:05" (1/1) ... [2023-01-28 07:44:05,901 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.01 07:44:05" (1/1) ... [2023-01-28 07:44:05,934 INFO L138 Inliner]: procedures = 170, calls = 30, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 80 [2023-01-28 07:44:05,934 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-01-28 07:44:05,935 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-01-28 07:44:05,935 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2023-01-28 07:44:05,935 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2023-01-28 07:44:05,942 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.01 07:44:05" (1/1) ... [2023-01-28 07:44:05,942 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.01 07:44:05" (1/1) ... [2023-01-28 07:44:05,944 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.01 07:44:05" (1/1) ... [2023-01-28 07:44:05,945 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.01 07:44:05" (1/1) ... [2023-01-28 07:44:05,950 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.01 07:44:05" (1/1) ... [2023-01-28 07:44:05,953 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.01 07:44:05" (1/1) ... [2023-01-28 07:44:05,955 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.01 07:44:05" (1/1) ... [2023-01-28 07:44:05,956 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.01 07:44:05" (1/1) ... [2023-01-28 07:44:05,962 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-01-28 07:44:05,963 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-01-28 07:44:05,963 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2023-01-28 07:44:05,963 INFO L275 PluginConnector]: RCFGBuilder initialized [2023-01-28 07:44:05,963 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.01 07:44:05" (1/1) ... [2023-01-28 07:44:05,968 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-01-28 07:44:05,987 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-01-28 07:44:06,006 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) [2023-01-28 07:44:06,017 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 [2023-01-28 07:44:06,041 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-01-28 07:44:06,042 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-01-28 07:44:06,042 INFO L130 BoogieDeclarations]: Found specification of procedure #PthreadsMutexLock [2023-01-28 07:44:06,042 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-01-28 07:44:06,042 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-01-28 07:44:06,042 INFO L130 BoogieDeclarations]: Found specification of procedure t_fun [2023-01-28 07:44:06,042 INFO L138 BoogieDeclarations]: Found implementation of procedure t_fun [2023-01-28 07:44:06,043 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-01-28 07:44:06,043 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-01-28 07:44:06,043 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-01-28 07:44:06,043 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-01-28 07:44:06,044 WARN L210 CfgBuilder]: User set CodeBlockSize to SequenceOfStatements but program contains fork statements. Overwriting the user preferences and setting CodeBlockSize to OneNontrivialStatement [2023-01-28 07:44:06,199 INFO L236 CfgBuilder]: Building ICFG [2023-01-28 07:44:06,201 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-01-28 07:44:06,378 INFO L277 CfgBuilder]: Performing block encoding [2023-01-28 07:44:06,384 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-01-28 07:44:06,384 INFO L302 CfgBuilder]: Removed 10 assume(true) statements. [2023-01-28 07:44:06,386 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 28.01 07:44:06 BoogieIcfgContainer [2023-01-28 07:44:06,386 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-01-28 07:44:06,388 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-01-28 07:44:06,388 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2023-01-28 07:44:06,390 INFO L275 PluginConnector]: TraceAbstraction initialized [2023-01-28 07:44:06,391 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 28.01 07:44:05" (1/3) ... [2023-01-28 07:44:06,391 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@467fa3f0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 28.01 07:44:06, skipping insertion in model container [2023-01-28 07:44:06,391 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.01 07:44:05" (2/3) ... [2023-01-28 07:44:06,392 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@467fa3f0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 28.01 07:44:06, skipping insertion in model container [2023-01-28 07:44:06,392 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 28.01 07:44:06" (3/3) ... [2023-01-28 07:44:06,393 INFO L112 eAbstractionObserver]: Analyzing ICFG 28-race_reach_02-simple_racefree.i [2023-01-28 07:44:06,407 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-01-28 07:44:06,407 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-01-28 07:44:06,408 INFO L515 ceAbstractionStarter]: Constructing petrified ICFG for 1 thread instances. [2023-01-28 07:44:06,468 INFO L144 ThreadInstanceAdder]: Constructed 1 joinOtherThreadTransitions. [2023-01-28 07:44:06,510 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 99 places, 108 transitions, 224 flow [2023-01-28 07:44:06,561 INFO L130 PetriNetUnfolder]: 17/141 cut-off events. [2023-01-28 07:44:06,562 INFO L131 PetriNetUnfolder]: For 1/1 co-relation queries the response was YES. [2023-01-28 07:44:06,566 INFO L83 FinitePrefix]: Finished finitePrefix Result has 147 conditions, 141 events. 17/141 cut-off events. For 1/1 co-relation queries the response was YES. Maximal size of possible extension queue 8. Compared 302 event pairs, 0 based on Foata normal form. 0/119 useless extension candidates. Maximal degree in co-relation 68. Up to 4 conditions per place. [2023-01-28 07:44:06,567 INFO L82 GeneralOperation]: Start removeDead. Operand has 99 places, 108 transitions, 224 flow [2023-01-28 07:44:06,570 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 95 places, 103 transitions, 211 flow [2023-01-28 07:44:06,573 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-01-28 07:44:06,581 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 95 places, 103 transitions, 211 flow [2023-01-28 07:44:06,584 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 95 places, 103 transitions, 211 flow [2023-01-28 07:44:06,584 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 95 places, 103 transitions, 211 flow [2023-01-28 07:44:06,625 INFO L130 PetriNetUnfolder]: 16/136 cut-off events. [2023-01-28 07:44:06,625 INFO L131 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2023-01-28 07:44:06,627 INFO L83 FinitePrefix]: Finished finitePrefix Result has 141 conditions, 136 events. 16/136 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 8. Compared 287 event pairs, 0 based on Foata normal form. 0/114 useless extension candidates. Maximal degree in co-relation 68. Up to 4 conditions per place. [2023-01-28 07:44:06,630 INFO L119 LiptonReduction]: Number of co-enabled transitions 2184 [2023-01-28 07:44:09,125 INFO L134 LiptonReduction]: Checked pairs total: 3620 [2023-01-28 07:44:09,125 INFO L136 LiptonReduction]: Total number of compositions: 88 [2023-01-28 07:44:09,138 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-01-28 07:44:09,143 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=false, 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;@def6751, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-01-28 07:44:09,143 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-01-28 07:44:09,146 INFO L130 PetriNetUnfolder]: 1/10 cut-off events. [2023-01-28 07:44:09,146 INFO L131 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2023-01-28 07:44:09,146 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-01-28 07:44:09,146 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1] [2023-01-28 07:44:09,147 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-01-28 07:44:09,151 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-01-28 07:44:09,151 INFO L85 PathProgramCache]: Analyzing trace with hash 12787872, now seen corresponding path program 1 times [2023-01-28 07:44:09,159 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-01-28 07:44:09,159 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1667229557] [2023-01-28 07:44:09,159 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-01-28 07:44:09,160 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-01-28 07:44:09,244 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-01-28 07:44:09,338 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-01-28 07:44:09,339 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-01-28 07:44:09,339 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1667229557] [2023-01-28 07:44:09,340 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1667229557] provided 1 perfect and 0 imperfect interpolant sequences [2023-01-28 07:44:09,340 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-01-28 07:44:09,340 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-01-28 07:44:09,341 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1768073783] [2023-01-28 07:44:09,342 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-01-28 07:44:09,349 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-01-28 07:44:09,355 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-01-28 07:44:09,374 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-01-28 07:44:09,375 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-01-28 07:44:09,377 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 87 out of 196 [2023-01-28 07:44:09,380 INFO L100 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 25 places, 30 transitions, 65 flow. Second operand has 3 states, 3 states have (on average 88.33333333333333) internal successors, (265), 3 states have internal predecessors, (265), 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) [2023-01-28 07:44:09,381 INFO L109 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-01-28 07:44:09,381 INFO L110 encePairwiseOnDemand]: Number of universal subtrahend loopers: 87 of 196 [2023-01-28 07:44:09,381 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-01-28 07:44:09,472 INFO L130 PetriNetUnfolder]: 72/174 cut-off events. [2023-01-28 07:44:09,472 INFO L131 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2023-01-28 07:44:09,473 INFO L83 FinitePrefix]: Finished finitePrefix Result has 352 conditions, 174 events. 72/174 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 13. Compared 687 event pairs, 0 based on Foata normal form. 10/166 useless extension candidates. Maximal degree in co-relation 323. Up to 154 conditions per place. [2023-01-28 07:44:09,475 INFO L137 encePairwiseOnDemand]: 184/196 looper letters, 21 selfloop transitions, 2 changer transitions 6/30 dead transitions. [2023-01-28 07:44:09,475 INFO L142 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 26 places, 30 transitions, 121 flow [2023-01-28 07:44:09,476 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-01-28 07:44:09,478 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-01-28 07:44:09,490 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 305 transitions. [2023-01-28 07:44:09,493 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.5187074829931972 [2023-01-28 07:44:09,494 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 305 transitions. [2023-01-28 07:44:09,494 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 305 transitions. [2023-01-28 07:44:09,497 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-01-28 07:44:09,499 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 305 transitions. [2023-01-28 07:44:09,504 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 101.66666666666667) internal successors, (305), 3 states have internal predecessors, (305), 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) [2023-01-28 07:44:09,507 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 196.0) internal successors, (784), 4 states have internal predecessors, (784), 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) [2023-01-28 07:44:09,508 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 196.0) internal successors, (784), 4 states have internal predecessors, (784), 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) [2023-01-28 07:44:09,509 INFO L175 Difference]: Start difference. First operand has 25 places, 30 transitions, 65 flow. Second operand 3 states and 305 transitions. [2023-01-28 07:44:09,510 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 26 places, 30 transitions, 121 flow [2023-01-28 07:44:09,513 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 26 places, 30 transitions, 121 flow, removed 0 selfloop flow, removed 0 redundant places. [2023-01-28 07:44:09,514 INFO L231 Difference]: Finished difference. Result has 27 places, 16 transitions, 43 flow [2023-01-28 07:44:09,516 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=196, PETRI_DIFFERENCE_MINUEND_FLOW=47, PETRI_DIFFERENCE_MINUEND_PLACES=24, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=21, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=2, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=19, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=43, PETRI_PLACES=27, PETRI_TRANSITIONS=16} [2023-01-28 07:44:09,518 INFO L281 CegarLoopForPetriNet]: 25 programPoint places, 2 predicate places. [2023-01-28 07:44:09,519 INFO L495 AbstractCegarLoop]: Abstraction has has 27 places, 16 transitions, 43 flow [2023-01-28 07:44:09,519 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 88.33333333333333) internal successors, (265), 3 states have internal predecessors, (265), 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) [2023-01-28 07:44:09,519 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-01-28 07:44:09,519 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2023-01-28 07:44:09,519 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-01-28 07:44:09,520 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-01-28 07:44:09,522 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-01-28 07:44:09,522 INFO L85 PathProgramCache]: Analyzing trace with hash -1456340180, now seen corresponding path program 1 times [2023-01-28 07:44:09,522 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-01-28 07:44:09,522 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [402433691] [2023-01-28 07:44:09,523 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-01-28 07:44:09,523 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-01-28 07:44:09,557 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-01-28 07:44:09,629 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-01-28 07:44:09,629 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-01-28 07:44:09,630 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [402433691] [2023-01-28 07:44:09,630 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [402433691] provided 0 perfect and 1 imperfect interpolant sequences [2023-01-28 07:44:09,630 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1122676861] [2023-01-28 07:44:09,630 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-01-28 07:44:09,630 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-01-28 07:44:09,630 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-01-28 07:44:09,633 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) [2023-01-28 07:44:09,639 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-01-28 07:44:09,699 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-01-28 07:44:09,701 INFO L263 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 3 conjunts are in the unsatisfiable core [2023-01-28 07:44:09,704 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2023-01-28 07:44:09,773 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-01-28 07:44:09,773 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2023-01-28 07:44:09,806 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-01-28 07:44:09,807 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1122676861] provided 0 perfect and 2 imperfect interpolant sequences [2023-01-28 07:44:09,807 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-01-28 07:44:09,807 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 6 [2023-01-28 07:44:09,808 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1389696274] [2023-01-28 07:44:09,808 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-01-28 07:44:09,808 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-01-28 07:44:09,808 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-01-28 07:44:09,809 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-01-28 07:44:09,809 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2023-01-28 07:44:09,810 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 87 out of 196 [2023-01-28 07:44:09,811 INFO L100 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 27 places, 16 transitions, 43 flow. Second operand has 7 states, 7 states have (on average 89.28571428571429) internal successors, (625), 7 states have internal predecessors, (625), 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) [2023-01-28 07:44:09,811 INFO L109 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-01-28 07:44:09,811 INFO L110 encePairwiseOnDemand]: Number of universal subtrahend loopers: 87 of 196 [2023-01-28 07:44:09,811 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-01-28 07:44:09,860 INFO L130 PetriNetUnfolder]: 16/46 cut-off events. [2023-01-28 07:44:09,860 INFO L131 PetriNetUnfolder]: For 15/15 co-relation queries the response was YES. [2023-01-28 07:44:09,860 INFO L83 FinitePrefix]: Finished finitePrefix Result has 117 conditions, 46 events. 16/46 cut-off events. For 15/15 co-relation queries the response was YES. Maximal size of possible extension queue 3. Compared 65 event pairs, 7 based on Foata normal form. 9/55 useless extension candidates. Maximal degree in co-relation 103. Up to 34 conditions per place. [2023-01-28 07:44:09,860 INFO L137 encePairwiseOnDemand]: 193/196 looper letters, 0 selfloop transitions, 0 changer transitions 22/22 dead transitions. [2023-01-28 07:44:09,860 INFO L142 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 22 places, 22 transitions, 95 flow [2023-01-28 07:44:09,861 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-01-28 07:44:09,861 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4 states. [2023-01-28 07:44:09,862 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4 states to 4 states and 370 transitions. [2023-01-28 07:44:09,862 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4719387755102041 [2023-01-28 07:44:09,862 INFO L72 ComplementDD]: Start complementDD. Operand 4 states and 370 transitions. [2023-01-28 07:44:09,862 INFO L73 IsDeterministic]: Start isDeterministic. Operand 4 states and 370 transitions. [2023-01-28 07:44:09,863 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-01-28 07:44:09,863 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 4 states and 370 transitions. [2023-01-28 07:44:09,865 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 5 states, 4 states have (on average 92.5) internal successors, (370), 4 states have internal predecessors, (370), 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) [2023-01-28 07:44:09,867 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 5 states, 5 states have (on average 196.0) internal successors, (980), 5 states have internal predecessors, (980), 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) [2023-01-28 07:44:09,867 INFO L81 ComplementDD]: Finished complementDD. Result has 5 states, 5 states have (on average 196.0) internal successors, (980), 5 states have internal predecessors, (980), 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) [2023-01-28 07:44:09,868 INFO L175 Difference]: Start difference. First operand has 27 places, 16 transitions, 43 flow. Second operand 4 states and 370 transitions. [2023-01-28 07:44:09,868 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 22 places, 22 transitions, 95 flow [2023-01-28 07:44:09,868 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 19 places, 22 transitions, 89 flow, removed 0 selfloop flow, removed 3 redundant places. [2023-01-28 07:44:09,868 INFO L231 Difference]: Finished difference. Result has 19 places, 0 transitions, 0 flow [2023-01-28 07:44:09,869 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=196, 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} [2023-01-28 07:44:09,869 INFO L281 CegarLoopForPetriNet]: 25 programPoint places, -6 predicate places. [2023-01-28 07:44:09,869 INFO L495 AbstractCegarLoop]: Abstraction has has 19 places, 0 transitions, 0 flow [2023-01-28 07:44:09,870 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 89.28571428571429) internal successors, (625), 7 states have internal predecessors, (625), 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) [2023-01-28 07:44:09,875 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION (0 of 1 remaining) [2023-01-28 07:44:09,883 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-01-28 07:44:10,076 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 [2023-01-28 07:44:10,077 INFO L445 BasicCegarLoop]: Path program histogram: [1, 1] [2023-01-28 07:44:10,079 INFO L307 ceAbstractionStarter]: Result for error location AllErrorsAtOnce was SAFE (1/2) [2023-01-28 07:44:10,082 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 99 places, 108 transitions, 224 flow [2023-01-28 07:44:10,094 INFO L130 PetriNetUnfolder]: 17/141 cut-off events. [2023-01-28 07:44:10,095 INFO L131 PetriNetUnfolder]: For 1/1 co-relation queries the response was YES. [2023-01-28 07:44:10,095 INFO L83 FinitePrefix]: Finished finitePrefix Result has 147 conditions, 141 events. 17/141 cut-off events. For 1/1 co-relation queries the response was YES. Maximal size of possible extension queue 8. Compared 302 event pairs, 0 based on Foata normal form. 0/119 useless extension candidates. Maximal degree in co-relation 68. Up to 4 conditions per place. [2023-01-28 07:44:10,095 INFO L82 GeneralOperation]: Start removeDead. Operand has 99 places, 108 transitions, 224 flow [2023-01-28 07:44:10,096 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 95 places, 103 transitions, 211 flow [2023-01-28 07:44:10,096 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-01-28 07:44:10,097 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 95 places, 103 transitions, 211 flow [2023-01-28 07:44:10,097 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 95 places, 103 transitions, 211 flow [2023-01-28 07:44:10,097 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 95 places, 103 transitions, 211 flow [2023-01-28 07:44:10,107 INFO L130 PetriNetUnfolder]: 16/136 cut-off events. [2023-01-28 07:44:10,107 INFO L131 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2023-01-28 07:44:10,108 INFO L83 FinitePrefix]: Finished finitePrefix Result has 141 conditions, 136 events. 16/136 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 8. Compared 287 event pairs, 0 based on Foata normal form. 0/114 useless extension candidates. Maximal degree in co-relation 68. Up to 4 conditions per place. [2023-01-28 07:44:10,109 INFO L119 LiptonReduction]: Number of co-enabled transitions 2184 [2023-01-28 07:44:12,411 INFO L134 LiptonReduction]: Checked pairs total: 3658 [2023-01-28 07:44:12,412 INFO L136 LiptonReduction]: Total number of compositions: 88 [2023-01-28 07:44:12,413 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == InUseError ======== [2023-01-28 07:44:12,414 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=false, 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;@def6751, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-01-28 07:44:12,414 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-01-28 07:44:12,417 INFO L130 PetriNetUnfolder]: 2/20 cut-off events. [2023-01-28 07:44:12,417 INFO L131 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2023-01-28 07:44:12,417 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-01-28 07:44:12,417 INFO L208 CegarLoopForPetriNet]: trace histogram [2, 1, 1, 1, 1] [2023-01-28 07:44:12,417 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-01-28 07:44:12,418 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-01-28 07:44:12,418 INFO L85 PathProgramCache]: Analyzing trace with hash 2001403219, now seen corresponding path program 1 times [2023-01-28 07:44:12,418 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-01-28 07:44:12,418 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [576890004] [2023-01-28 07:44:12,418 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-01-28 07:44:12,418 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-01-28 07:44:12,454 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-01-28 07:44:12,454 INFO L356 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2023-01-28 07:44:12,464 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-01-28 07:44:12,495 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2023-01-28 07:44:12,495 INFO L360 BasicCegarLoop]: Counterexample is feasible [2023-01-28 07:44:12,496 INFO L805 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (0 of 1 remaining) [2023-01-28 07:44:12,496 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2023-01-28 07:44:12,496 INFO L445 BasicCegarLoop]: Path program histogram: [1] [2023-01-28 07:44:12,497 INFO L307 ceAbstractionStarter]: Result for error location InUseError was UNSAFE (2/2) [2023-01-28 07:44:12,497 WARN L233 ceAbstractionStarter]: 1 thread instances were not sufficient, I will increase this number and restart the analysis [2023-01-28 07:44:12,497 INFO L515 ceAbstractionStarter]: Constructing petrified ICFG for 2 thread instances. [2023-01-28 07:44:12,512 INFO L144 ThreadInstanceAdder]: Constructed 2 joinOtherThreadTransitions. [2023-01-28 07:44:12,514 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 124 places, 138 transitions, 294 flow [2023-01-28 07:44:12,531 INFO L130 PetriNetUnfolder]: 31/228 cut-off events. [2023-01-28 07:44:12,531 INFO L131 PetriNetUnfolder]: For 6/6 co-relation queries the response was YES. [2023-01-28 07:44:12,533 INFO L83 FinitePrefix]: Finished finitePrefix Result has 242 conditions, 228 events. 31/228 cut-off events. For 6/6 co-relation queries the response was YES. Maximal size of possible extension queue 9. Compared 596 event pairs, 0 based on Foata normal form. 0/190 useless extension candidates. Maximal degree in co-relation 143. Up to 8 conditions per place. [2023-01-28 07:44:12,533 INFO L82 GeneralOperation]: Start removeDead. Operand has 124 places, 138 transitions, 294 flow [2023-01-28 07:44:12,534 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 124 places, 138 transitions, 294 flow [2023-01-28 07:44:12,534 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-01-28 07:44:12,535 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 124 places, 138 transitions, 294 flow [2023-01-28 07:44:12,535 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 124 places, 138 transitions, 294 flow [2023-01-28 07:44:12,535 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 124 places, 138 transitions, 294 flow [2023-01-28 07:44:12,553 INFO L130 PetriNetUnfolder]: 31/228 cut-off events. [2023-01-28 07:44:12,553 INFO L131 PetriNetUnfolder]: For 6/6 co-relation queries the response was YES. [2023-01-28 07:44:12,554 INFO L83 FinitePrefix]: Finished finitePrefix Result has 242 conditions, 228 events. 31/228 cut-off events. For 6/6 co-relation queries the response was YES. Maximal size of possible extension queue 9. Compared 596 event pairs, 0 based on Foata normal form. 0/190 useless extension candidates. Maximal degree in co-relation 143. Up to 8 conditions per place. [2023-01-28 07:44:12,558 INFO L119 LiptonReduction]: Number of co-enabled transitions 6552 [2023-01-28 07:44:14,874 INFO L134 LiptonReduction]: Checked pairs total: 15572 [2023-01-28 07:44:14,874 INFO L136 LiptonReduction]: Total number of compositions: 97 [2023-01-28 07:44:14,876 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-01-28 07:44:14,877 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=false, 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;@def6751, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-01-28 07:44:14,877 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-01-28 07:44:14,879 INFO L130 PetriNetUnfolder]: 1/11 cut-off events. [2023-01-28 07:44:14,879 INFO L131 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2023-01-28 07:44:14,879 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-01-28 07:44:14,879 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1] [2023-01-28 07:44:14,879 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-01-28 07:44:14,880 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-01-28 07:44:14,880 INFO L85 PathProgramCache]: Analyzing trace with hash 23658196, now seen corresponding path program 1 times [2023-01-28 07:44:14,880 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-01-28 07:44:14,880 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [198370478] [2023-01-28 07:44:14,880 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-01-28 07:44:14,880 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-01-28 07:44:14,897 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-01-28 07:44:14,930 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-01-28 07:44:14,930 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-01-28 07:44:14,931 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [198370478] [2023-01-28 07:44:14,931 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [198370478] provided 1 perfect and 0 imperfect interpolant sequences [2023-01-28 07:44:14,931 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-01-28 07:44:14,931 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-01-28 07:44:14,931 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1712047532] [2023-01-28 07:44:14,931 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-01-28 07:44:14,932 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-01-28 07:44:14,932 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-01-28 07:44:14,932 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-01-28 07:44:14,932 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-01-28 07:44:14,933 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 109 out of 235 [2023-01-28 07:44:14,933 INFO L100 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 45 places, 57 transitions, 132 flow. Second operand has 3 states, 3 states have (on average 110.33333333333333) internal successors, (331), 3 states have internal predecessors, (331), 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) [2023-01-28 07:44:14,934 INFO L109 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-01-28 07:44:14,934 INFO L110 encePairwiseOnDemand]: Number of universal subtrahend loopers: 109 of 235 [2023-01-28 07:44:14,934 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-01-28 07:44:15,150 INFO L130 PetriNetUnfolder]: 1376/2498 cut-off events. [2023-01-28 07:44:15,151 INFO L131 PetriNetUnfolder]: For 44/44 co-relation queries the response was YES. [2023-01-28 07:44:15,154 INFO L83 FinitePrefix]: Finished finitePrefix Result has 4822 conditions, 2498 events. 1376/2498 cut-off events. For 44/44 co-relation queries the response was YES. Maximal size of possible extension queue 112. Compared 15224 event pairs, 648 based on Foata normal form. 569/2763 useless extension candidates. Maximal degree in co-relation 645. Up to 2257 conditions per place. [2023-01-28 07:44:15,159 INFO L137 encePairwiseOnDemand]: 217/235 looper letters, 28 selfloop transitions, 2 changer transitions 11/50 dead transitions. [2023-01-28 07:44:15,159 INFO L142 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 47 places, 50 transitions, 196 flow [2023-01-28 07:44:15,160 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-01-28 07:44:15,160 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-01-28 07:44:15,161 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 388 transitions. [2023-01-28 07:44:15,161 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.550354609929078 [2023-01-28 07:44:15,161 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 388 transitions. [2023-01-28 07:44:15,161 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 388 transitions. [2023-01-28 07:44:15,162 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-01-28 07:44:15,162 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 388 transitions. [2023-01-28 07:44:15,163 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 129.33333333333334) internal successors, (388), 3 states have internal predecessors, (388), 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) [2023-01-28 07:44:15,165 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 235.0) internal successors, (940), 4 states have internal predecessors, (940), 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) [2023-01-28 07:44:15,166 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 235.0) internal successors, (940), 4 states have internal predecessors, (940), 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) [2023-01-28 07:44:15,166 INFO L175 Difference]: Start difference. First operand has 45 places, 57 transitions, 132 flow. Second operand 3 states and 388 transitions. [2023-01-28 07:44:15,166 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 47 places, 50 transitions, 196 flow [2023-01-28 07:44:15,167 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 47 places, 50 transitions, 196 flow, removed 0 selfloop flow, removed 0 redundant places. [2023-01-28 07:44:15,169 INFO L231 Difference]: Finished difference. Result has 48 places, 32 transitions, 82 flow [2023-01-28 07:44:15,170 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=235, PETRI_DIFFERENCE_MINUEND_FLOW=102, PETRI_DIFFERENCE_MINUEND_PLACES=45, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=42, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=40, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=82, PETRI_PLACES=48, PETRI_TRANSITIONS=32} [2023-01-28 07:44:15,171 INFO L281 CegarLoopForPetriNet]: 45 programPoint places, 3 predicate places. [2023-01-28 07:44:15,173 INFO L495 AbstractCegarLoop]: Abstraction has has 48 places, 32 transitions, 82 flow [2023-01-28 07:44:15,173 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 110.33333333333333) internal successors, (331), 3 states have internal predecessors, (331), 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) [2023-01-28 07:44:15,173 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-01-28 07:44:15,173 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2023-01-28 07:44:15,174 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2023-01-28 07:44:15,174 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-01-28 07:44:15,174 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-01-28 07:44:15,174 INFO L85 PathProgramCache]: Analyzing trace with hash -967238456, now seen corresponding path program 1 times [2023-01-28 07:44:15,177 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-01-28 07:44:15,177 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1278880427] [2023-01-28 07:44:15,177 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-01-28 07:44:15,177 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-01-28 07:44:15,198 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-01-28 07:44:15,247 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-01-28 07:44:15,248 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-01-28 07:44:15,248 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1278880427] [2023-01-28 07:44:15,248 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1278880427] provided 0 perfect and 1 imperfect interpolant sequences [2023-01-28 07:44:15,248 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1628118971] [2023-01-28 07:44:15,249 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-01-28 07:44:15,249 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-01-28 07:44:15,249 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-01-28 07:44:15,253 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) [2023-01-28 07:44:15,282 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-01-28 07:44:15,317 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-01-28 07:44:15,318 INFO L263 TraceCheckSpWp]: Trace formula consists of 120 conjuncts, 3 conjunts are in the unsatisfiable core [2023-01-28 07:44:15,319 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2023-01-28 07:44:15,332 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-01-28 07:44:15,332 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2023-01-28 07:44:15,352 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-01-28 07:44:15,353 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1628118971] provided 0 perfect and 2 imperfect interpolant sequences [2023-01-28 07:44:15,353 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-01-28 07:44:15,353 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 6 [2023-01-28 07:44:15,353 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1279431870] [2023-01-28 07:44:15,353 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-01-28 07:44:15,354 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-01-28 07:44:15,354 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-01-28 07:44:15,354 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-01-28 07:44:15,354 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2023-01-28 07:44:15,355 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 109 out of 235 [2023-01-28 07:44:15,356 INFO L100 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 48 places, 32 transitions, 82 flow. Second operand has 7 states, 7 states have (on average 111.28571428571429) internal successors, (779), 7 states have internal predecessors, (779), 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) [2023-01-28 07:44:15,356 INFO L109 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-01-28 07:44:15,356 INFO L110 encePairwiseOnDemand]: Number of universal subtrahend loopers: 109 of 235 [2023-01-28 07:44:15,356 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-01-28 07:44:15,438 INFO L130 PetriNetUnfolder]: 286/547 cut-off events. [2023-01-28 07:44:15,438 INFO L131 PetriNetUnfolder]: For 137/137 co-relation queries the response was YES. [2023-01-28 07:44:15,439 INFO L83 FinitePrefix]: Finished finitePrefix Result has 1152 conditions, 547 events. 286/547 cut-off events. For 137/137 co-relation queries the response was YES. Maximal size of possible extension queue 31. Compared 2525 event pairs, 99 based on Foata normal form. 70/614 useless extension candidates. Maximal degree in co-relation 929. Up to 346 conditions per place. [2023-01-28 07:44:15,439 INFO L137 encePairwiseOnDemand]: 232/235 looper letters, 0 selfloop transitions, 0 changer transitions 51/51 dead transitions. [2023-01-28 07:44:15,439 INFO L142 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 40 places, 51 transitions, 202 flow [2023-01-28 07:44:15,440 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-01-28 07:44:15,440 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5 states. [2023-01-28 07:44:15,441 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5 states to 5 states and 589 transitions. [2023-01-28 07:44:15,441 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.5012765957446809 [2023-01-28 07:44:15,441 INFO L72 ComplementDD]: Start complementDD. Operand 5 states and 589 transitions. [2023-01-28 07:44:15,442 INFO L73 IsDeterministic]: Start isDeterministic. Operand 5 states and 589 transitions. [2023-01-28 07:44:15,442 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-01-28 07:44:15,442 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 5 states and 589 transitions. [2023-01-28 07:44:15,443 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 6 states, 5 states have (on average 117.8) internal successors, (589), 5 states have internal predecessors, (589), 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) [2023-01-28 07:44:15,445 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 6 states, 6 states have (on average 235.0) internal successors, (1410), 6 states have internal predecessors, (1410), 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) [2023-01-28 07:44:15,446 INFO L81 ComplementDD]: Finished complementDD. Result has 6 states, 6 states have (on average 235.0) internal successors, (1410), 6 states have internal predecessors, (1410), 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) [2023-01-28 07:44:15,446 INFO L175 Difference]: Start difference. First operand has 48 places, 32 transitions, 82 flow. Second operand 5 states and 589 transitions. [2023-01-28 07:44:15,446 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 40 places, 51 transitions, 202 flow [2023-01-28 07:44:15,447 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 39 places, 51 transitions, 200 flow, removed 0 selfloop flow, removed 1 redundant places. [2023-01-28 07:44:15,448 INFO L231 Difference]: Finished difference. Result has 39 places, 0 transitions, 0 flow [2023-01-28 07:44:15,448 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=235, 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} [2023-01-28 07:44:15,448 INFO L281 CegarLoopForPetriNet]: 45 programPoint places, -6 predicate places. [2023-01-28 07:44:15,449 INFO L495 AbstractCegarLoop]: Abstraction has has 39 places, 0 transitions, 0 flow [2023-01-28 07:44:15,449 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 111.28571428571429) internal successors, (779), 7 states have internal predecessors, (779), 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) [2023-01-28 07:44:15,449 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION (0 of 1 remaining) [2023-01-28 07:44:15,463 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2023-01-28 07:44:15,654 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 [2023-01-28 07:44:15,654 INFO L445 BasicCegarLoop]: Path program histogram: [1, 1] [2023-01-28 07:44:15,655 INFO L307 ceAbstractionStarter]: Result for error location AllErrorsAtOnce was SAFE (1/2) [2023-01-28 07:44:15,657 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 124 places, 138 transitions, 294 flow [2023-01-28 07:44:15,674 INFO L130 PetriNetUnfolder]: 31/228 cut-off events. [2023-01-28 07:44:15,674 INFO L131 PetriNetUnfolder]: For 6/6 co-relation queries the response was YES. [2023-01-28 07:44:15,675 INFO L83 FinitePrefix]: Finished finitePrefix Result has 242 conditions, 228 events. 31/228 cut-off events. For 6/6 co-relation queries the response was YES. Maximal size of possible extension queue 9. Compared 596 event pairs, 0 based on Foata normal form. 0/190 useless extension candidates. Maximal degree in co-relation 143. Up to 8 conditions per place. [2023-01-28 07:44:15,675 INFO L82 GeneralOperation]: Start removeDead. Operand has 124 places, 138 transitions, 294 flow [2023-01-28 07:44:15,676 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 124 places, 138 transitions, 294 flow [2023-01-28 07:44:15,676 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-01-28 07:44:15,676 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 124 places, 138 transitions, 294 flow [2023-01-28 07:44:15,677 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 124 places, 138 transitions, 294 flow [2023-01-28 07:44:15,677 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 124 places, 138 transitions, 294 flow [2023-01-28 07:44:15,692 INFO L130 PetriNetUnfolder]: 31/228 cut-off events. [2023-01-28 07:44:15,692 INFO L131 PetriNetUnfolder]: For 6/6 co-relation queries the response was YES. [2023-01-28 07:44:15,693 INFO L83 FinitePrefix]: Finished finitePrefix Result has 242 conditions, 228 events. 31/228 cut-off events. For 6/6 co-relation queries the response was YES. Maximal size of possible extension queue 9. Compared 596 event pairs, 0 based on Foata normal form. 0/190 useless extension candidates. Maximal degree in co-relation 143. Up to 8 conditions per place. [2023-01-28 07:44:15,696 INFO L119 LiptonReduction]: Number of co-enabled transitions 6552 [2023-01-28 07:44:17,870 INFO L134 LiptonReduction]: Checked pairs total: 15492 [2023-01-28 07:44:17,871 INFO L136 LiptonReduction]: Total number of compositions: 97 [2023-01-28 07:44:17,872 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == InUseError ======== [2023-01-28 07:44:17,872 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=false, 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;@def6751, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-01-28 07:44:17,872 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-01-28 07:44:17,877 INFO L130 PetriNetUnfolder]: 12/57 cut-off events. [2023-01-28 07:44:17,878 INFO L131 PetriNetUnfolder]: For 3/3 co-relation queries the response was YES. [2023-01-28 07:44:17,878 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-01-28 07:44:17,878 INFO L208 CegarLoopForPetriNet]: trace histogram [3, 2, 2, 1, 1, 1, 1] [2023-01-28 07:44:17,878 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-01-28 07:44:17,878 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-01-28 07:44:17,879 INFO L85 PathProgramCache]: Analyzing trace with hash 399689966, now seen corresponding path program 1 times [2023-01-28 07:44:17,879 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-01-28 07:44:17,879 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [768026427] [2023-01-28 07:44:17,879 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-01-28 07:44:17,879 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-01-28 07:44:17,905 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-01-28 07:44:17,906 INFO L356 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2023-01-28 07:44:17,917 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-01-28 07:44:17,923 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2023-01-28 07:44:17,925 INFO L360 BasicCegarLoop]: Counterexample is feasible [2023-01-28 07:44:17,926 INFO L805 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (0 of 1 remaining) [2023-01-28 07:44:17,926 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2023-01-28 07:44:17,926 INFO L445 BasicCegarLoop]: Path program histogram: [1] [2023-01-28 07:44:17,927 INFO L307 ceAbstractionStarter]: Result for error location InUseError was UNSAFE (2/2) [2023-01-28 07:44:17,927 WARN L233 ceAbstractionStarter]: 2 thread instances were not sufficient, I will increase this number and restart the analysis [2023-01-28 07:44:17,927 INFO L515 ceAbstractionStarter]: Constructing petrified ICFG for 3 thread instances. [2023-01-28 07:44:17,952 INFO L144 ThreadInstanceAdder]: Constructed 3 joinOtherThreadTransitions. [2023-01-28 07:44:17,953 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 149 places, 168 transitions, 366 flow [2023-01-28 07:44:17,982 INFO L130 PetriNetUnfolder]: 50/346 cut-off events. [2023-01-28 07:44:17,982 INFO L131 PetriNetUnfolder]: For 19/19 co-relation queries the response was YES. [2023-01-28 07:44:17,984 INFO L83 FinitePrefix]: Finished finitePrefix Result has 374 conditions, 346 events. 50/346 cut-off events. For 19/19 co-relation queries the response was YES. Maximal size of possible extension queue 10. Compared 1041 event pairs, 1 based on Foata normal form. 0/288 useless extension candidates. Maximal degree in co-relation 236. Up to 16 conditions per place. [2023-01-28 07:44:17,984 INFO L82 GeneralOperation]: Start removeDead. Operand has 149 places, 168 transitions, 366 flow [2023-01-28 07:44:17,986 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 149 places, 168 transitions, 366 flow [2023-01-28 07:44:17,986 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-01-28 07:44:17,987 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 149 places, 168 transitions, 366 flow [2023-01-28 07:44:17,987 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 149 places, 168 transitions, 366 flow [2023-01-28 07:44:17,987 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 149 places, 168 transitions, 366 flow [2023-01-28 07:44:18,011 INFO L130 PetriNetUnfolder]: 50/346 cut-off events. [2023-01-28 07:44:18,012 INFO L131 PetriNetUnfolder]: For 19/19 co-relation queries the response was YES. [2023-01-28 07:44:18,014 INFO L83 FinitePrefix]: Finished finitePrefix Result has 374 conditions, 346 events. 50/346 cut-off events. For 19/19 co-relation queries the response was YES. Maximal size of possible extension queue 10. Compared 1041 event pairs, 1 based on Foata normal form. 0/288 useless extension candidates. Maximal degree in co-relation 236. Up to 16 conditions per place. [2023-01-28 07:44:18,023 INFO L119 LiptonReduction]: Number of co-enabled transitions 12432 [2023-01-28 07:44:20,282 INFO L134 LiptonReduction]: Checked pairs total: 36272 [2023-01-28 07:44:20,282 INFO L136 LiptonReduction]: Total number of compositions: 115 [2023-01-28 07:44:20,283 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-01-28 07:44:20,284 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=false, 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;@def6751, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-01-28 07:44:20,284 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-01-28 07:44:20,285 INFO L130 PetriNetUnfolder]: 1/10 cut-off events. [2023-01-28 07:44:20,285 INFO L131 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2023-01-28 07:44:20,285 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-01-28 07:44:20,286 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1] [2023-01-28 07:44:20,286 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-01-28 07:44:20,286 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-01-28 07:44:20,286 INFO L85 PathProgramCache]: Analyzing trace with hash 36275445, now seen corresponding path program 1 times [2023-01-28 07:44:20,286 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-01-28 07:44:20,286 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [346307783] [2023-01-28 07:44:20,286 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-01-28 07:44:20,286 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-01-28 07:44:20,300 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-01-28 07:44:20,320 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-01-28 07:44:20,321 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-01-28 07:44:20,321 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [346307783] [2023-01-28 07:44:20,321 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [346307783] provided 1 perfect and 0 imperfect interpolant sequences [2023-01-28 07:44:20,321 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-01-28 07:44:20,321 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-01-28 07:44:20,321 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [296618279] [2023-01-28 07:44:20,321 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-01-28 07:44:20,322 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-01-28 07:44:20,322 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-01-28 07:44:20,322 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-01-28 07:44:20,322 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-01-28 07:44:20,323 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 131 out of 283 [2023-01-28 07:44:20,323 INFO L100 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 58 places, 74 transitions, 178 flow. Second operand has 3 states, 3 states have (on average 132.33333333333334) internal successors, (397), 3 states have internal predecessors, (397), 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) [2023-01-28 07:44:20,323 INFO L109 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-01-28 07:44:20,324 INFO L110 encePairwiseOnDemand]: Number of universal subtrahend loopers: 131 of 283 [2023-01-28 07:44:20,324 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-01-28 07:44:22,845 INFO L130 PetriNetUnfolder]: 23815/35886 cut-off events. [2023-01-28 07:44:22,845 INFO L131 PetriNetUnfolder]: For 1071/1071 co-relation queries the response was YES. [2023-01-28 07:44:22,892 INFO L83 FinitePrefix]: Finished finitePrefix Result has 70265 conditions, 35886 events. 23815/35886 cut-off events. For 1071/1071 co-relation queries the response was YES. Maximal size of possible extension queue 996. Compared 248519 event pairs, 15337 based on Foata normal form. 7136/40059 useless extension candidates. Maximal degree in co-relation 5685. Up to 33630 conditions per place. [2023-01-28 07:44:22,982 INFO L137 encePairwiseOnDemand]: 260/283 looper letters, 41 selfloop transitions, 2 changer transitions 11/64 dead transitions. [2023-01-28 07:44:22,982 INFO L142 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 60 places, 64 transitions, 262 flow [2023-01-28 07:44:22,983 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-01-28 07:44:22,983 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-01-28 07:44:22,984 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 472 transitions. [2023-01-28 07:44:22,984 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.5559481743227326 [2023-01-28 07:44:22,984 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 472 transitions. [2023-01-28 07:44:22,984 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 472 transitions. [2023-01-28 07:44:22,985 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-01-28 07:44:22,985 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 472 transitions. [2023-01-28 07:44:22,986 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 157.33333333333334) internal successors, (472), 3 states have internal predecessors, (472), 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) [2023-01-28 07:44:22,988 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 283.0) internal successors, (1132), 4 states have internal predecessors, (1132), 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) [2023-01-28 07:44:22,990 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 283.0) internal successors, (1132), 4 states have internal predecessors, (1132), 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) [2023-01-28 07:44:22,990 INFO L175 Difference]: Start difference. First operand has 58 places, 74 transitions, 178 flow. Second operand 3 states and 472 transitions. [2023-01-28 07:44:22,990 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 60 places, 64 transitions, 262 flow [2023-01-28 07:44:22,992 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 60 places, 64 transitions, 262 flow, removed 0 selfloop flow, removed 0 redundant places. [2023-01-28 07:44:22,993 INFO L231 Difference]: Finished difference. Result has 61 places, 44 transitions, 113 flow [2023-01-28 07:44:22,993 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=283, 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} [2023-01-28 07:44:22,995 INFO L281 CegarLoopForPetriNet]: 58 programPoint places, 3 predicate places. [2023-01-28 07:44:22,995 INFO L495 AbstractCegarLoop]: Abstraction has has 61 places, 44 transitions, 113 flow [2023-01-28 07:44:22,995 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 132.33333333333334) internal successors, (397), 3 states have internal predecessors, (397), 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) [2023-01-28 07:44:22,995 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-01-28 07:44:22,995 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2023-01-28 07:44:22,995 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2023-01-28 07:44:22,995 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-01-28 07:44:22,996 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-01-28 07:44:22,996 INFO L85 PathProgramCache]: Analyzing trace with hash -2090643985, now seen corresponding path program 1 times [2023-01-28 07:44:22,996 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-01-28 07:44:22,996 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1768555053] [2023-01-28 07:44:22,996 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-01-28 07:44:22,996 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-01-28 07:44:23,010 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-01-28 07:44:23,047 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-01-28 07:44:23,047 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-01-28 07:44:23,047 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1768555053] [2023-01-28 07:44:23,047 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1768555053] provided 0 perfect and 1 imperfect interpolant sequences [2023-01-28 07:44:23,047 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [489415616] [2023-01-28 07:44:23,048 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-01-28 07:44:23,048 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-01-28 07:44:23,048 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-01-28 07:44:23,049 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) [2023-01-28 07:44:23,072 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-01-28 07:44:23,119 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-01-28 07:44:23,120 INFO L263 TraceCheckSpWp]: Trace formula consists of 120 conjuncts, 3 conjunts are in the unsatisfiable core [2023-01-28 07:44:23,121 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2023-01-28 07:44:23,134 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-01-28 07:44:23,135 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2023-01-28 07:44:23,150 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-01-28 07:44:23,150 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [489415616] provided 0 perfect and 2 imperfect interpolant sequences [2023-01-28 07:44:23,150 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-01-28 07:44:23,151 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 6 [2023-01-28 07:44:23,151 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [617608145] [2023-01-28 07:44:23,151 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-01-28 07:44:23,151 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-01-28 07:44:23,151 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-01-28 07:44:23,152 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-01-28 07:44:23,152 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2023-01-28 07:44:23,152 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 131 out of 283 [2023-01-28 07:44:23,153 INFO L100 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 61 places, 44 transitions, 113 flow. Second operand has 7 states, 7 states have (on average 133.28571428571428) internal successors, (933), 7 states have internal predecessors, (933), 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) [2023-01-28 07:44:23,153 INFO L109 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-01-28 07:44:23,156 INFO L110 encePairwiseOnDemand]: Number of universal subtrahend loopers: 131 of 283 [2023-01-28 07:44:23,156 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-01-28 07:44:23,831 INFO L130 PetriNetUnfolder]: 5560/8368 cut-off events. [2023-01-28 07:44:23,832 INFO L131 PetriNetUnfolder]: For 1090/1090 co-relation queries the response was YES. [2023-01-28 07:44:23,845 INFO L83 FinitePrefix]: Finished finitePrefix Result has 17576 conditions, 8368 events. 5560/8368 cut-off events. For 1090/1090 co-relation queries the response was YES. Maximal size of possible extension queue 275. Compared 49349 event pairs, 70 based on Foata normal form. 819/9185 useless extension candidates. Maximal degree in co-relation 15499. Up to 5346 conditions per place. [2023-01-28 07:44:23,851 INFO L137 encePairwiseOnDemand]: 280/283 looper letters, 0 selfloop transitions, 0 changer transitions 93/93 dead transitions. [2023-01-28 07:44:23,852 INFO L142 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 55 places, 93 transitions, 377 flow [2023-01-28 07:44:23,852 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-01-28 07:44:23,852 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6 states. [2023-01-28 07:44:23,854 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6 states to 6 states and 872 transitions. [2023-01-28 07:44:23,854 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.5135453474676089 [2023-01-28 07:44:23,855 INFO L72 ComplementDD]: Start complementDD. Operand 6 states and 872 transitions. [2023-01-28 07:44:23,855 INFO L73 IsDeterministic]: Start isDeterministic. Operand 6 states and 872 transitions. [2023-01-28 07:44:23,855 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-01-28 07:44:23,855 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 6 states and 872 transitions. [2023-01-28 07:44:23,857 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 7 states, 6 states have (on average 145.33333333333334) internal successors, (872), 6 states have internal predecessors, (872), 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) [2023-01-28 07:44:23,860 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 7 states, 7 states have (on average 283.0) internal successors, (1981), 7 states have internal predecessors, (1981), 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) [2023-01-28 07:44:23,860 INFO L81 ComplementDD]: Finished complementDD. Result has 7 states, 7 states have (on average 283.0) internal successors, (1981), 7 states have internal predecessors, (1981), 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) [2023-01-28 07:44:23,860 INFO L175 Difference]: Start difference. First operand has 61 places, 44 transitions, 113 flow. Second operand 6 states and 872 transitions. [2023-01-28 07:44:23,860 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 55 places, 93 transitions, 377 flow [2023-01-28 07:44:23,864 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 54 places, 93 transitions, 373 flow, removed 1 selfloop flow, removed 1 redundant places. [2023-01-28 07:44:23,865 INFO L231 Difference]: Finished difference. Result has 54 places, 0 transitions, 0 flow [2023-01-28 07:44:23,865 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=283, 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} [2023-01-28 07:44:23,866 INFO L281 CegarLoopForPetriNet]: 58 programPoint places, -4 predicate places. [2023-01-28 07:44:23,867 INFO L495 AbstractCegarLoop]: Abstraction has has 54 places, 0 transitions, 0 flow [2023-01-28 07:44:23,867 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 133.28571428571428) internal successors, (933), 7 states have internal predecessors, (933), 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) [2023-01-28 07:44:23,867 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION (0 of 1 remaining) [2023-01-28 07:44:23,875 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-01-28 07:44:24,071 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 [2023-01-28 07:44:24,072 INFO L445 BasicCegarLoop]: Path program histogram: [1, 1] [2023-01-28 07:44:24,072 INFO L307 ceAbstractionStarter]: Result for error location AllErrorsAtOnce was SAFE (1/2) [2023-01-28 07:44:24,074 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 149 places, 168 transitions, 366 flow [2023-01-28 07:44:24,105 INFO L130 PetriNetUnfolder]: 50/346 cut-off events. [2023-01-28 07:44:24,105 INFO L131 PetriNetUnfolder]: For 19/19 co-relation queries the response was YES. [2023-01-28 07:44:24,107 INFO L83 FinitePrefix]: Finished finitePrefix Result has 374 conditions, 346 events. 50/346 cut-off events. For 19/19 co-relation queries the response was YES. Maximal size of possible extension queue 10. Compared 1041 event pairs, 1 based on Foata normal form. 0/288 useless extension candidates. Maximal degree in co-relation 236. Up to 16 conditions per place. [2023-01-28 07:44:24,107 INFO L82 GeneralOperation]: Start removeDead. Operand has 149 places, 168 transitions, 366 flow [2023-01-28 07:44:24,109 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 149 places, 168 transitions, 366 flow [2023-01-28 07:44:24,109 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-01-28 07:44:24,109 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 149 places, 168 transitions, 366 flow [2023-01-28 07:44:24,109 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 149 places, 168 transitions, 366 flow [2023-01-28 07:44:24,109 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 149 places, 168 transitions, 366 flow [2023-01-28 07:44:24,139 INFO L130 PetriNetUnfolder]: 50/346 cut-off events. [2023-01-28 07:44:24,139 INFO L131 PetriNetUnfolder]: For 19/19 co-relation queries the response was YES. [2023-01-28 07:44:24,141 INFO L83 FinitePrefix]: Finished finitePrefix Result has 374 conditions, 346 events. 50/346 cut-off events. For 19/19 co-relation queries the response was YES. Maximal size of possible extension queue 10. Compared 1041 event pairs, 1 based on Foata normal form. 0/288 useless extension candidates. Maximal degree in co-relation 236. Up to 16 conditions per place. [2023-01-28 07:44:24,151 INFO L119 LiptonReduction]: Number of co-enabled transitions 12432 [2023-01-28 07:44:26,391 INFO L134 LiptonReduction]: Checked pairs total: 33302 [2023-01-28 07:44:26,391 INFO L136 LiptonReduction]: Total number of compositions: 112 [2023-01-28 07:44:26,392 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == InUseError ======== [2023-01-28 07:44:26,392 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=false, 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;@def6751, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-01-28 07:44:26,392 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-01-28 07:44:26,397 INFO L130 PetriNetUnfolder]: 24/98 cut-off events. [2023-01-28 07:44:26,398 INFO L131 PetriNetUnfolder]: For 10/10 co-relation queries the response was YES. [2023-01-28 07:44:26,398 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-01-28 07:44:26,398 INFO L208 CegarLoopForPetriNet]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1] [2023-01-28 07:44:26,398 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-01-28 07:44:26,398 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-01-28 07:44:26,398 INFO L85 PathProgramCache]: Analyzing trace with hash -34247515, now seen corresponding path program 1 times [2023-01-28 07:44:26,398 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-01-28 07:44:26,398 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1914043012] [2023-01-28 07:44:26,398 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-01-28 07:44:26,398 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-01-28 07:44:26,418 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-01-28 07:44:26,418 INFO L356 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2023-01-28 07:44:26,425 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-01-28 07:44:26,432 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2023-01-28 07:44:26,432 INFO L360 BasicCegarLoop]: Counterexample is feasible [2023-01-28 07:44:26,433 INFO L805 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (0 of 1 remaining) [2023-01-28 07:44:26,433 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2023-01-28 07:44:26,433 INFO L445 BasicCegarLoop]: Path program histogram: [1] [2023-01-28 07:44:26,433 INFO L307 ceAbstractionStarter]: Result for error location InUseError was UNSAFE (2/2) [2023-01-28 07:44:26,433 WARN L233 ceAbstractionStarter]: 3 thread instances were not sufficient, I will increase this number and restart the analysis [2023-01-28 07:44:26,433 INFO L515 ceAbstractionStarter]: Constructing petrified ICFG for 4 thread instances. [2023-01-28 07:44:26,451 INFO L144 ThreadInstanceAdder]: Constructed 4 joinOtherThreadTransitions. [2023-01-28 07:44:26,452 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 174 places, 198 transitions, 440 flow [2023-01-28 07:44:26,495 INFO L130 PetriNetUnfolder]: 81/528 cut-off events. [2023-01-28 07:44:26,496 INFO L131 PetriNetUnfolder]: For 48/48 co-relation queries the response was YES. [2023-01-28 07:44:26,498 INFO L83 FinitePrefix]: Finished finitePrefix Result has 583 conditions, 528 events. 81/528 cut-off events. For 48/48 co-relation queries the response was YES. Maximal size of possible extension queue 12. Compared 1873 event pairs, 6 based on Foata normal form. 0/442 useless extension candidates. Maximal degree in co-relation 366. Up to 32 conditions per place. [2023-01-28 07:44:26,499 INFO L82 GeneralOperation]: Start removeDead. Operand has 174 places, 198 transitions, 440 flow [2023-01-28 07:44:26,501 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 174 places, 198 transitions, 440 flow [2023-01-28 07:44:26,501 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-01-28 07:44:26,501 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 174 places, 198 transitions, 440 flow [2023-01-28 07:44:26,501 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 174 places, 198 transitions, 440 flow [2023-01-28 07:44:26,501 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 174 places, 198 transitions, 440 flow [2023-01-28 07:44:26,543 INFO L130 PetriNetUnfolder]: 81/528 cut-off events. [2023-01-28 07:44:26,543 INFO L131 PetriNetUnfolder]: For 48/48 co-relation queries the response was YES. [2023-01-28 07:44:26,546 INFO L83 FinitePrefix]: Finished finitePrefix Result has 583 conditions, 528 events. 81/528 cut-off events. For 48/48 co-relation queries the response was YES. Maximal size of possible extension queue 12. Compared 1873 event pairs, 6 based on Foata normal form. 0/442 useless extension candidates. Maximal degree in co-relation 366. Up to 32 conditions per place. [2023-01-28 07:44:26,554 INFO L119 LiptonReduction]: Number of co-enabled transitions 20048 [2023-01-28 07:44:28,761 INFO L134 LiptonReduction]: Checked pairs total: 56524 [2023-01-28 07:44:28,762 INFO L136 LiptonReduction]: Total number of compositions: 127 [2023-01-28 07:44:28,763 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-01-28 07:44:28,763 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=false, 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;@def6751, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-01-28 07:44:28,763 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-01-28 07:44:28,764 INFO L130 PetriNetUnfolder]: 1/11 cut-off events. [2023-01-28 07:44:28,765 INFO L131 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2023-01-28 07:44:28,765 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-01-28 07:44:28,765 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1] [2023-01-28 07:44:28,765 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-01-28 07:44:28,765 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-01-28 07:44:28,765 INFO L85 PathProgramCache]: Analyzing trace with hash 50655235, now seen corresponding path program 1 times [2023-01-28 07:44:28,765 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-01-28 07:44:28,765 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [332824009] [2023-01-28 07:44:28,765 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-01-28 07:44:28,766 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-01-28 07:44:28,779 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-01-28 07:44:28,808 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-01-28 07:44:28,809 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-01-28 07:44:28,809 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [332824009] [2023-01-28 07:44:28,809 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [332824009] provided 1 perfect and 0 imperfect interpolant sequences [2023-01-28 07:44:28,809 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-01-28 07:44:28,809 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-01-28 07:44:28,809 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1704531353] [2023-01-28 07:44:28,809 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-01-28 07:44:28,810 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-01-28 07:44:28,810 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-01-28 07:44:28,810 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-01-28 07:44:28,810 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-01-28 07:44:28,811 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 153 out of 325 [2023-01-28 07:44:28,811 INFO L100 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 73 places, 95 transitions, 234 flow. Second operand has 3 states, 3 states have (on average 154.33333333333334) internal successors, (463), 3 states have internal predecessors, (463), 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) [2023-01-28 07:44:28,811 INFO L109 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-01-28 07:44:28,811 INFO L110 encePairwiseOnDemand]: Number of universal subtrahend loopers: 153 of 325 [2023-01-28 07:44:28,811 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-01-28 07:44:48,468 INFO L130 PetriNetUnfolder]: 230525/321293 cut-off events. [2023-01-28 07:44:48,469 INFO L131 PetriNetUnfolder]: For 12048/12048 co-relation queries the response was YES. [2023-01-28 07:44:48,905 INFO L83 FinitePrefix]: Finished finitePrefix Result has 629779 conditions, 321293 events. 230525/321293 cut-off events. For 12048/12048 co-relation queries the response was YES. Maximal size of possible extension queue 7350. Compared 2524087 event pairs, 187184 based on Foata normal form. 60142/356184 useless extension candidates. Maximal degree in co-relation 60884. Up to 301798 conditions per place. [2023-01-28 07:44:49,821 INFO L137 encePairwiseOnDemand]: 295/325 looper letters, 46 selfloop transitions, 2 changer transitions 13/77 dead transitions. [2023-01-28 07:44:49,822 INFO L142 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 75 places, 77 transitions, 316 flow [2023-01-28 07:44:49,822 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-01-28 07:44:49,822 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-01-28 07:44:49,823 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 552 transitions. [2023-01-28 07:44:49,824 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.5661538461538461 [2023-01-28 07:44:49,824 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 552 transitions. [2023-01-28 07:44:49,824 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 552 transitions. [2023-01-28 07:44:49,824 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-01-28 07:44:49,824 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 552 transitions. [2023-01-28 07:44:49,825 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 184.0) internal successors, (552), 3 states have internal predecessors, (552), 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) [2023-01-28 07:44:49,827 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 325.0) internal successors, (1300), 4 states have internal predecessors, (1300), 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) [2023-01-28 07:44:49,827 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 325.0) internal successors, (1300), 4 states have internal predecessors, (1300), 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) [2023-01-28 07:44:49,827 INFO L175 Difference]: Start difference. First operand has 73 places, 95 transitions, 234 flow. Second operand 3 states and 552 transitions. [2023-01-28 07:44:49,827 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 75 places, 77 transitions, 316 flow [2023-01-28 07:44:49,833 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 75 places, 77 transitions, 316 flow, removed 0 selfloop flow, removed 0 redundant places. [2023-01-28 07:44:49,835 INFO L231 Difference]: Finished difference. Result has 76 places, 56 transitions, 146 flow [2023-01-28 07:44:49,836 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=325, PETRI_DIFFERENCE_MINUEND_FLOW=180, PETRI_DIFFERENCE_MINUEND_PLACES=73, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=68, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=66, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=146, PETRI_PLACES=76, PETRI_TRANSITIONS=56} [2023-01-28 07:44:49,836 INFO L281 CegarLoopForPetriNet]: 73 programPoint places, 3 predicate places. [2023-01-28 07:44:49,836 INFO L495 AbstractCegarLoop]: Abstraction has has 76 places, 56 transitions, 146 flow [2023-01-28 07:44:49,836 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 154.33333333333334) internal successors, (463), 3 states have internal predecessors, (463), 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) [2023-01-28 07:44:49,836 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-01-28 07:44:49,837 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2023-01-28 07:44:49,837 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2023-01-28 07:44:49,837 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-01-28 07:44:49,837 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-01-28 07:44:49,837 INFO L85 PathProgramCache]: Analyzing trace with hash -2063039137, now seen corresponding path program 1 times [2023-01-28 07:44:49,837 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-01-28 07:44:49,837 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [260557433] [2023-01-28 07:44:49,837 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-01-28 07:44:49,837 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-01-28 07:44:49,846 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-01-28 07:44:49,877 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-01-28 07:44:49,878 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-01-28 07:44:49,878 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [260557433] [2023-01-28 07:44:49,878 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [260557433] provided 0 perfect and 1 imperfect interpolant sequences [2023-01-28 07:44:49,878 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [435102893] [2023-01-28 07:44:49,878 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-01-28 07:44:49,878 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-01-28 07:44:49,878 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-01-28 07:44:49,879 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) [2023-01-28 07:44:49,910 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-01-28 07:44:49,956 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-01-28 07:44:49,957 INFO L263 TraceCheckSpWp]: Trace formula consists of 120 conjuncts, 3 conjunts are in the unsatisfiable core [2023-01-28 07:44:49,957 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2023-01-28 07:44:49,968 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-01-28 07:44:49,968 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2023-01-28 07:44:49,987 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-01-28 07:44:49,987 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [435102893] provided 0 perfect and 2 imperfect interpolant sequences [2023-01-28 07:44:49,987 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-01-28 07:44:49,987 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 6 [2023-01-28 07:44:49,987 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2005525475] [2023-01-28 07:44:49,987 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-01-28 07:44:49,988 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-01-28 07:44:49,988 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-01-28 07:44:49,988 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-01-28 07:44:49,988 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2023-01-28 07:44:49,989 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 153 out of 325 [2023-01-28 07:44:49,990 INFO L100 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 76 places, 56 transitions, 146 flow. Second operand has 7 states, 7 states have (on average 155.28571428571428) internal successors, (1087), 7 states have internal predecessors, (1087), 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) [2023-01-28 07:44:49,990 INFO L109 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-01-28 07:44:49,990 INFO L110 encePairwiseOnDemand]: Number of universal subtrahend loopers: 153 of 325 [2023-01-28 07:44:49,990 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-01-28 07:44:57,173 INFO L130 PetriNetUnfolder]: 96934/132328 cut-off events. [2023-01-28 07:44:57,174 INFO L131 PetriNetUnfolder]: For 12052/12052 co-relation queries the response was YES. [2023-01-28 07:44:57,342 INFO L83 FinitePrefix]: Finished finitePrefix Result has 271323 conditions, 132328 events. 96934/132328 cut-off events. For 12052/12052 co-relation queries the response was YES. Maximal size of possible extension queue 3498. Compared 932585 event pairs, 11282 based on Foata normal form. 584/132910 useless extension candidates. Maximal degree in co-relation 97127. Up to 83201 conditions per place. [2023-01-28 07:44:57,791 INFO L137 encePairwiseOnDemand]: 321/325 looper letters, 111 selfloop transitions, 5 changer transitions 1/133 dead transitions. [2023-01-28 07:44:57,791 INFO L142 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 72 places, 133 transitions, 538 flow [2023-01-28 07:44:57,791 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-01-28 07:44:57,792 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6 states. [2023-01-28 07:44:57,796 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6 states to 6 states and 1038 transitions. [2023-01-28 07:44:57,798 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.5323076923076923 [2023-01-28 07:44:57,798 INFO L72 ComplementDD]: Start complementDD. Operand 6 states and 1038 transitions. [2023-01-28 07:44:57,798 INFO L73 IsDeterministic]: Start isDeterministic. Operand 6 states and 1038 transitions. [2023-01-28 07:44:57,798 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-01-28 07:44:57,798 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 6 states and 1038 transitions. [2023-01-28 07:44:57,803 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 7 states, 6 states have (on average 173.0) internal successors, (1038), 6 states have internal predecessors, (1038), 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) [2023-01-28 07:44:57,806 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 7 states, 7 states have (on average 325.0) internal successors, (2275), 7 states have internal predecessors, (2275), 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) [2023-01-28 07:44:57,807 INFO L81 ComplementDD]: Finished complementDD. Result has 7 states, 7 states have (on average 325.0) internal successors, (2275), 7 states have internal predecessors, (2275), 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) [2023-01-28 07:44:57,807 INFO L175 Difference]: Start difference. First operand has 76 places, 56 transitions, 146 flow. Second operand 6 states and 1038 transitions. [2023-01-28 07:44:57,807 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 72 places, 133 transitions, 538 flow [2023-01-28 07:44:57,820 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 71 places, 133 transitions, 530 flow, removed 3 selfloop flow, removed 1 redundant places. [2023-01-28 07:44:57,821 INFO L231 Difference]: Finished difference. Result has 75 places, 58 transitions, 172 flow [2023-01-28 07:44:57,821 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=325, 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} [2023-01-28 07:44:57,822 INFO L281 CegarLoopForPetriNet]: 73 programPoint places, 2 predicate places. [2023-01-28 07:44:57,823 INFO L495 AbstractCegarLoop]: Abstraction has has 75 places, 58 transitions, 172 flow [2023-01-28 07:44:57,823 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 155.28571428571428) internal successors, (1087), 7 states have internal predecessors, (1087), 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) [2023-01-28 07:44:57,823 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-01-28 07:44:57,823 INFO L208 CegarLoopForPetriNet]: trace histogram [4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1] [2023-01-28 07:44:57,828 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-01-28 07:44:58,028 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 [2023-01-28 07:44:58,028 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-01-28 07:44:58,029 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-01-28 07:44:58,029 INFO L85 PathProgramCache]: Analyzing trace with hash -781048019, now seen corresponding path program 1 times [2023-01-28 07:44:58,029 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-01-28 07:44:58,029 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [528516085] [2023-01-28 07:44:58,029 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-01-28 07:44:58,029 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-01-28 07:44:58,043 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-01-28 07:44:58,128 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2023-01-28 07:44:58,128 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-01-28 07:44:58,128 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [528516085] [2023-01-28 07:44:58,128 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [528516085] provided 1 perfect and 0 imperfect interpolant sequences [2023-01-28 07:44:58,128 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-01-28 07:44:58,128 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-01-28 07:44:58,130 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1314103374] [2023-01-28 07:44:58,130 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-01-28 07:44:58,130 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-01-28 07:44:58,130 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-01-28 07:44:58,131 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-01-28 07:44:58,131 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-01-28 07:44:58,131 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 142 out of 325 [2023-01-28 07:44:58,132 INFO L100 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 75 places, 58 transitions, 172 flow. Second operand has 3 states, 3 states have (on average 145.33333333333334) internal successors, (436), 3 states have internal predecessors, (436), 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) [2023-01-28 07:44:58,132 INFO L109 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-01-28 07:44:58,132 INFO L110 encePairwiseOnDemand]: Number of universal subtrahend loopers: 142 of 325 [2023-01-28 07:44:58,132 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-01-28 07:45:12,480 INFO L130 PetriNetUnfolder]: 195434/260044 cut-off events. [2023-01-28 07:45:12,480 INFO L131 PetriNetUnfolder]: For 187178/187178 co-relation queries the response was YES. [2023-01-28 07:45:12,932 INFO L83 FinitePrefix]: Finished finitePrefix Result has 599332 conditions, 260044 events. 195434/260044 cut-off events. For 187178/187178 co-relation queries the response was YES. Maximal size of possible extension queue 5444. Compared 1733978 event pairs, 98977 based on Foata normal form. 144/259966 useless extension candidates. Maximal degree in co-relation 488629. Up to 251105 conditions per place. [2023-01-28 07:45:13,721 INFO L137 encePairwiseOnDemand]: 319/325 looper letters, 69 selfloop transitions, 5 changer transitions 0/82 dead transitions. [2023-01-28 07:45:13,722 INFO L142 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 77 places, 82 transitions, 416 flow [2023-01-28 07:45:13,722 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-01-28 07:45:13,722 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-01-28 07:45:13,723 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 495 transitions. [2023-01-28 07:45:13,723 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.5076923076923077 [2023-01-28 07:45:13,723 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 495 transitions. [2023-01-28 07:45:13,723 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 495 transitions. [2023-01-28 07:45:13,724 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-01-28 07:45:13,724 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 495 transitions. [2023-01-28 07:45:13,724 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 165.0) internal successors, (495), 3 states have internal predecessors, (495), 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) [2023-01-28 07:45:13,726 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 325.0) internal successors, (1300), 4 states have internal predecessors, (1300), 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) [2023-01-28 07:45:13,726 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 325.0) internal successors, (1300), 4 states have internal predecessors, (1300), 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) [2023-01-28 07:45:13,726 INFO L175 Difference]: Start difference. First operand has 75 places, 58 transitions, 172 flow. Second operand 3 states and 495 transitions. [2023-01-28 07:45:13,726 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 77 places, 82 transitions, 416 flow [2023-01-28 07:45:13,798 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 74 places, 82 transitions, 396 flow, removed 6 selfloop flow, removed 3 redundant places. [2023-01-28 07:45:13,800 INFO L231 Difference]: Finished difference. Result has 75 places, 62 transitions, 194 flow [2023-01-28 07:45:13,800 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=325, 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} [2023-01-28 07:45:13,801 INFO L281 CegarLoopForPetriNet]: 73 programPoint places, 2 predicate places. [2023-01-28 07:45:13,801 INFO L495 AbstractCegarLoop]: Abstraction has has 75 places, 62 transitions, 194 flow [2023-01-28 07:45:13,801 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 145.33333333333334) internal successors, (436), 3 states have internal predecessors, (436), 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) [2023-01-28 07:45:13,802 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-01-28 07:45:13,802 INFO L208 CegarLoopForPetriNet]: trace histogram [4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-01-28 07:45:13,802 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2023-01-28 07:45:13,802 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-01-28 07:45:13,802 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-01-28 07:45:13,802 INFO L85 PathProgramCache]: Analyzing trace with hash 305277450, now seen corresponding path program 1 times [2023-01-28 07:45:13,802 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-01-28 07:45:13,802 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [245888061] [2023-01-28 07:45:13,802 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-01-28 07:45:13,803 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-01-28 07:45:13,823 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-01-28 07:45:13,887 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-01-28 07:45:13,888 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-01-28 07:45:13,888 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [245888061] [2023-01-28 07:45:13,888 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [245888061] provided 0 perfect and 1 imperfect interpolant sequences [2023-01-28 07:45:13,888 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [893986611] [2023-01-28 07:45:13,888 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-01-28 07:45:13,888 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-01-28 07:45:13,889 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-01-28 07:45:13,890 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) [2023-01-28 07:45:13,898 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-01-28 07:45:13,971 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-01-28 07:45:13,973 INFO L263 TraceCheckSpWp]: Trace formula consists of 195 conjuncts, 6 conjunts are in the unsatisfiable core [2023-01-28 07:45:13,974 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2023-01-28 07:45:14,017 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-01-28 07:45:14,017 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2023-01-28 07:45:14,083 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-01-28 07:45:14,083 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [893986611] provided 0 perfect and 2 imperfect interpolant sequences [2023-01-28 07:45:14,083 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-01-28 07:45:14,083 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 12 [2023-01-28 07:45:14,084 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1375813816] [2023-01-28 07:45:14,084 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-01-28 07:45:14,084 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2023-01-28 07:45:14,084 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-01-28 07:45:14,085 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2023-01-28 07:45:14,085 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=78, Unknown=0, NotChecked=0, Total=156 [2023-01-28 07:45:14,086 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 153 out of 325 [2023-01-28 07:45:14,087 INFO L100 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 75 places, 62 transitions, 194 flow. Second operand has 13 states, 13 states have (on average 156.0) internal successors, (2028), 13 states have internal predecessors, (2028), 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) [2023-01-28 07:45:14,087 INFO L109 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-01-28 07:45:14,087 INFO L110 encePairwiseOnDemand]: Number of universal subtrahend loopers: 153 of 325 [2023-01-28 07:45:14,087 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-01-28 07:45:17,045 INFO L130 PetriNetUnfolder]: 35678/51092 cut-off events. [2023-01-28 07:45:17,046 INFO L131 PetriNetUnfolder]: For 62384/62384 co-relation queries the response was YES. [2023-01-28 07:45:17,155 INFO L83 FinitePrefix]: Finished finitePrefix Result has 112611 conditions, 51092 events. 35678/51092 cut-off events. For 62384/62384 co-relation queries the response was YES. Maximal size of possible extension queue 1458. Compared 359539 event pairs, 412 based on Foata normal form. 5117/56023 useless extension candidates. Maximal degree in co-relation 65956. Up to 23073 conditions per place. [2023-01-28 07:45:17,185 INFO L137 encePairwiseOnDemand]: 322/325 looper letters, 0 selfloop transitions, 0 changer transitions 139/139 dead transitions. [2023-01-28 07:45:17,185 INFO L142 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 78 places, 139 transitions, 621 flow [2023-01-28 07:45:17,185 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-01-28 07:45:17,185 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7 states. [2023-01-28 07:45:17,187 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7 states to 7 states and 1185 transitions. [2023-01-28 07:45:17,188 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.5208791208791209 [2023-01-28 07:45:17,188 INFO L72 ComplementDD]: Start complementDD. Operand 7 states and 1185 transitions. [2023-01-28 07:45:17,188 INFO L73 IsDeterministic]: Start isDeterministic. Operand 7 states and 1185 transitions. [2023-01-28 07:45:17,189 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-01-28 07:45:17,189 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 7 states and 1185 transitions. [2023-01-28 07:45:17,191 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 8 states, 7 states have (on average 169.28571428571428) internal successors, (1185), 7 states have internal predecessors, (1185), 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) [2023-01-28 07:45:17,194 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 8 states, 8 states have (on average 325.0) internal successors, (2600), 8 states have internal predecessors, (2600), 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) [2023-01-28 07:45:17,194 INFO L81 ComplementDD]: Finished complementDD. Result has 8 states, 8 states have (on average 325.0) internal successors, (2600), 8 states have internal predecessors, (2600), 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) [2023-01-28 07:45:17,194 INFO L175 Difference]: Start difference. First operand has 75 places, 62 transitions, 194 flow. Second operand 7 states and 1185 transitions. [2023-01-28 07:45:17,194 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 78 places, 139 transitions, 621 flow [2023-01-28 07:45:17,205 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 73 places, 139 transitions, 601 flow, removed 0 selfloop flow, removed 5 redundant places. [2023-01-28 07:45:17,206 INFO L231 Difference]: Finished difference. Result has 73 places, 0 transitions, 0 flow [2023-01-28 07:45:17,206 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=325, 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} [2023-01-28 07:45:17,207 INFO L281 CegarLoopForPetriNet]: 73 programPoint places, 0 predicate places. [2023-01-28 07:45:17,207 INFO L495 AbstractCegarLoop]: Abstraction has has 73 places, 0 transitions, 0 flow [2023-01-28 07:45:17,208 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 156.0) internal successors, (2028), 13 states have internal predecessors, (2028), 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) [2023-01-28 07:45:17,208 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION (0 of 1 remaining) [2023-01-28 07:45:17,214 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-01-28 07:45:17,408 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 [2023-01-28 07:45:17,409 INFO L445 BasicCegarLoop]: Path program histogram: [1, 1, 1, 1] [2023-01-28 07:45:17,409 INFO L307 ceAbstractionStarter]: Result for error location AllErrorsAtOnce was SAFE (1/2) [2023-01-28 07:45:17,411 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 174 places, 198 transitions, 440 flow [2023-01-28 07:45:17,445 INFO L130 PetriNetUnfolder]: 81/528 cut-off events. [2023-01-28 07:45:17,446 INFO L131 PetriNetUnfolder]: For 48/48 co-relation queries the response was YES. [2023-01-28 07:45:17,448 INFO L83 FinitePrefix]: Finished finitePrefix Result has 583 conditions, 528 events. 81/528 cut-off events. For 48/48 co-relation queries the response was YES. Maximal size of possible extension queue 12. Compared 1873 event pairs, 6 based on Foata normal form. 0/442 useless extension candidates. Maximal degree in co-relation 366. Up to 32 conditions per place. [2023-01-28 07:45:17,448 INFO L82 GeneralOperation]: Start removeDead. Operand has 174 places, 198 transitions, 440 flow [2023-01-28 07:45:17,449 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 174 places, 198 transitions, 440 flow [2023-01-28 07:45:17,449 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-01-28 07:45:17,449 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 174 places, 198 transitions, 440 flow [2023-01-28 07:45:17,449 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 174 places, 198 transitions, 440 flow [2023-01-28 07:45:17,449 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 174 places, 198 transitions, 440 flow [2023-01-28 07:45:17,490 INFO L130 PetriNetUnfolder]: 81/528 cut-off events. [2023-01-28 07:45:17,490 INFO L131 PetriNetUnfolder]: For 48/48 co-relation queries the response was YES. [2023-01-28 07:45:17,493 INFO L83 FinitePrefix]: Finished finitePrefix Result has 583 conditions, 528 events. 81/528 cut-off events. For 48/48 co-relation queries the response was YES. Maximal size of possible extension queue 12. Compared 1873 event pairs, 6 based on Foata normal form. 0/442 useless extension candidates. Maximal degree in co-relation 366. Up to 32 conditions per place. [2023-01-28 07:45:17,503 INFO L119 LiptonReduction]: Number of co-enabled transitions 20048 [2023-01-28 07:45:19,932 INFO L134 LiptonReduction]: Checked pairs total: 56366 [2023-01-28 07:45:19,932 INFO L136 LiptonReduction]: Total number of compositions: 127 [2023-01-28 07:45:19,933 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == InUseError ======== [2023-01-28 07:45:19,934 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=false, 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;@def6751, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-01-28 07:45:19,935 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-01-28 07:45:19,940 INFO L130 PetriNetUnfolder]: 33/136 cut-off events. [2023-01-28 07:45:19,940 INFO L131 PetriNetUnfolder]: For 23/23 co-relation queries the response was YES. [2023-01-28 07:45:19,940 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-01-28 07:45:19,940 INFO L208 CegarLoopForPetriNet]: trace histogram [5, 4, 4, 1, 1, 1, 1, 1, 1] [2023-01-28 07:45:19,940 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-01-28 07:45:19,940 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-01-28 07:45:19,941 INFO L85 PathProgramCache]: Analyzing trace with hash 275274405, now seen corresponding path program 1 times [2023-01-28 07:45:19,941 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-01-28 07:45:19,941 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [387863795] [2023-01-28 07:45:19,941 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-01-28 07:45:19,941 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-01-28 07:45:19,955 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-01-28 07:45:19,955 INFO L356 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2023-01-28 07:45:19,962 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-01-28 07:45:19,971 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2023-01-28 07:45:19,972 INFO L360 BasicCegarLoop]: Counterexample is feasible [2023-01-28 07:45:19,972 INFO L805 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (0 of 1 remaining) [2023-01-28 07:45:19,972 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2023-01-28 07:45:19,972 INFO L445 BasicCegarLoop]: Path program histogram: [1] [2023-01-28 07:45:19,972 INFO L307 ceAbstractionStarter]: Result for error location InUseError was UNSAFE (2/2) [2023-01-28 07:45:19,972 WARN L233 ceAbstractionStarter]: 4 thread instances were not sufficient, I will increase this number and restart the analysis [2023-01-28 07:45:19,973 INFO L515 ceAbstractionStarter]: Constructing petrified ICFG for 5 thread instances. [2023-01-28 07:45:20,000 INFO L144 ThreadInstanceAdder]: Constructed 5 joinOtherThreadTransitions. [2023-01-28 07:45:20,003 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 199 places, 228 transitions, 516 flow [2023-01-28 07:45:20,089 INFO L130 PetriNetUnfolder]: 140/842 cut-off events. [2023-01-28 07:45:20,089 INFO L131 PetriNetUnfolder]: For 110/110 co-relation queries the response was YES. [2023-01-28 07:45:20,094 INFO L83 FinitePrefix]: Finished finitePrefix Result has 953 conditions, 842 events. 140/842 cut-off events. For 110/110 co-relation queries the response was YES. Maximal size of possible extension queue 16. Compared 3587 event pairs, 23 based on Foata normal form. 0/712 useless extension candidates. Maximal degree in co-relation 573. Up to 80 conditions per place. [2023-01-28 07:45:20,095 INFO L82 GeneralOperation]: Start removeDead. Operand has 199 places, 228 transitions, 516 flow [2023-01-28 07:45:20,098 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 199 places, 228 transitions, 516 flow [2023-01-28 07:45:20,098 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-01-28 07:45:20,098 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 199 places, 228 transitions, 516 flow [2023-01-28 07:45:20,098 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 199 places, 228 transitions, 516 flow [2023-01-28 07:45:20,098 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 199 places, 228 transitions, 516 flow [2023-01-28 07:45:20,166 INFO L130 PetriNetUnfolder]: 140/842 cut-off events. [2023-01-28 07:45:20,166 INFO L131 PetriNetUnfolder]: For 110/110 co-relation queries the response was YES. [2023-01-28 07:45:20,171 INFO L83 FinitePrefix]: Finished finitePrefix Result has 953 conditions, 842 events. 140/842 cut-off events. For 110/110 co-relation queries the response was YES. Maximal size of possible extension queue 16. Compared 3587 event pairs, 23 based on Foata normal form. 0/712 useless extension candidates. Maximal degree in co-relation 573. Up to 80 conditions per place. [2023-01-28 07:45:20,184 INFO L119 LiptonReduction]: Number of co-enabled transitions 29400 [2023-01-28 07:45:22,414 INFO L134 LiptonReduction]: Checked pairs total: 85295 [2023-01-28 07:45:22,414 INFO L136 LiptonReduction]: Total number of compositions: 142 [2023-01-28 07:45:22,416 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-01-28 07:45:22,416 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=false, 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;@def6751, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-01-28 07:45:22,416 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-01-28 07:45:22,417 INFO L130 PetriNetUnfolder]: 1/12 cut-off events. [2023-01-28 07:45:22,417 INFO L131 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2023-01-28 07:45:22,418 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-01-28 07:45:22,418 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1] [2023-01-28 07:45:22,418 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-01-28 07:45:22,418 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-01-28 07:45:22,418 INFO L85 PathProgramCache]: Analyzing trace with hash 66877972, now seen corresponding path program 1 times [2023-01-28 07:45:22,418 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-01-28 07:45:22,418 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [193435076] [2023-01-28 07:45:22,418 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-01-28 07:45:22,418 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-01-28 07:45:22,426 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-01-28 07:45:22,437 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-01-28 07:45:22,437 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-01-28 07:45:22,437 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [193435076] [2023-01-28 07:45:22,437 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [193435076] provided 1 perfect and 0 imperfect interpolant sequences [2023-01-28 07:45:22,437 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-01-28 07:45:22,438 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-01-28 07:45:22,438 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1253603213] [2023-01-28 07:45:22,438 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-01-28 07:45:22,438 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-01-28 07:45:22,438 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-01-28 07:45:22,438 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-01-28 07:45:22,438 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-01-28 07:45:22,439 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 175 out of 370 [2023-01-28 07:45:22,440 INFO L100 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 87 places, 114 transitions, 288 flow. Second operand has 3 states, 3 states have (on average 176.33333333333334) internal successors, (529), 3 states have internal predecessors, (529), 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) [2023-01-28 07:45:22,440 INFO L109 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-01-28 07:45:22,440 INFO L110 encePairwiseOnDemand]: Number of universal subtrahend loopers: 175 of 370 [2023-01-28 07:45:22,440 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand