./Ultimate.py --spec ../../../trunk/examples/svcomp/properties/no-overflow.prp --file ../../../trunk/examples/svcomp/goblint-regression/28-race_reach_72-funloop_hard_racing.i --full-output --traceabstraction.when.to.check.the.insufficient.erros.location.relative.to.the.other.error.locations BEFORE --architecture 32bit -------------------------------------------------------------------------------- Checking for overflows Using default analysis Version b8dbc81d Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/config -Xmx15G -Xms4m -jar /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data -tc /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/AutomizerReach.xml -i ../../../trunk/examples/svcomp/goblint-regression/28-race_reach_72-funloop_hard_racing.i -s /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Overflow-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! overflow) ) --witnessprinter.graph.data.producer Automizer --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 566e2cbe460cf96671c9cef5a53ce51910e23c462e96f394be80b957976729c5 --traceabstraction.when.to.check.the.insufficient.erros.location.relative.to.the.other.error.locations BEFORE --- Real Ultimate output --- This is Ultimate 0.2.3-?-b8dbc81 [2023-09-01 06:54:05,697 INFO L177 SettingsManager]: Resetting all preferences to default values... [2023-09-01 06:54:05,698 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2023-09-01 06:54:05,724 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2023-09-01 06:54:05,725 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2023-09-01 06:54:05,725 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2023-09-01 06:54:05,726 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2023-09-01 06:54:05,728 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2023-09-01 06:54:05,729 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2023-09-01 06:54:05,730 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2023-09-01 06:54:05,731 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2023-09-01 06:54:05,732 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2023-09-01 06:54:05,732 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2023-09-01 06:54:05,733 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2023-09-01 06:54:05,734 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2023-09-01 06:54:05,735 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2023-09-01 06:54:05,735 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2023-09-01 06:54:05,736 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2023-09-01 06:54:05,737 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2023-09-01 06:54:05,739 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2023-09-01 06:54:05,740 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2023-09-01 06:54:05,754 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2023-09-01 06:54:05,755 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2023-09-01 06:54:05,755 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2023-09-01 06:54:05,758 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2023-09-01 06:54:05,758 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2023-09-01 06:54:05,759 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2023-09-01 06:54:05,759 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2023-09-01 06:54:05,760 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2023-09-01 06:54:05,761 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2023-09-01 06:54:05,761 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2023-09-01 06:54:05,761 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2023-09-01 06:54:05,762 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2023-09-01 06:54:05,763 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2023-09-01 06:54:05,763 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2023-09-01 06:54:05,764 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2023-09-01 06:54:05,764 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2023-09-01 06:54:05,764 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2023-09-01 06:54:05,764 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2023-09-01 06:54:05,765 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2023-09-01 06:54:05,766 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2023-09-01 06:54:05,767 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Overflow-32bit-Automizer_Default.epf [2023-09-01 06:54:05,784 INFO L113 SettingsManager]: Loading preferences was successful [2023-09-01 06:54:05,785 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2023-09-01 06:54:05,785 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-09-01 06:54:05,785 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-09-01 06:54:05,786 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-09-01 06:54:05,786 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-09-01 06:54:05,786 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2023-09-01 06:54:05,787 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2023-09-01 06:54:05,787 INFO L138 SettingsManager]: * Use SBE=true [2023-09-01 06:54:05,787 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-09-01 06:54:05,787 INFO L138 SettingsManager]: * sizeof long=4 [2023-09-01 06:54:05,787 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2023-09-01 06:54:05,788 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2023-09-01 06:54:05,788 INFO L138 SettingsManager]: * sizeof POINTER=4 [2023-09-01 06:54:05,788 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2023-09-01 06:54:05,788 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-09-01 06:54:05,788 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-09-01 06:54:05,788 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-09-01 06:54:05,789 INFO L138 SettingsManager]: * Check absence of signed integer overflows=true [2023-09-01 06:54:05,789 INFO L138 SettingsManager]: * sizeof long double=12 [2023-09-01 06:54:05,789 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2023-09-01 06:54:05,789 INFO L138 SettingsManager]: * Use constant arrays=true [2023-09-01 06:54:05,789 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-09-01 06:54:05,789 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-09-01 06:54:05,790 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2023-09-01 06:54:05,790 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2023-09-01 06:54:05,790 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-09-01 06:54:05,791 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-09-01 06:54:05,791 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-09-01 06:54:05,791 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2023-09-01 06:54:05,791 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2023-09-01 06:54:05,791 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-09-01 06:54:05,791 INFO L138 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2023-09-01 06:54:05,792 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-09-01 06:54:05,792 INFO L138 SettingsManager]: * Order on configurations for Petri net unfoldings=DBO [2023-09-01 06:54:05,792 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-09-01 06:54:05,792 INFO L138 SettingsManager]: * Independence relation used for large block encoding in concurrent analysis=SYNTACTIC [2023-09-01 06:54:05,792 INFO L138 SettingsManager]: * Looper check in Petri net analysis=SEMANTIC WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! overflow) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 566e2cbe460cf96671c9cef5a53ce51910e23c462e96f394be80b957976729c5 Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: When to check the insufficient erros location relative to the other error locations -> BEFORE [2023-09-01 06:54:06,192 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-09-01 06:54:06,214 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-09-01 06:54:06,216 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-09-01 06:54:06,216 INFO L271 PluginConnector]: Initializing CDTParser... [2023-09-01 06:54:06,217 INFO L275 PluginConnector]: CDTParser initialized [2023-09-01 06:54:06,218 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/goblint-regression/28-race_reach_72-funloop_hard_racing.i [2023-09-01 06:54:07,219 INFO L500 CDTParser]: Created temporary CDT project at NULL [2023-09-01 06:54:07,457 INFO L351 CDTParser]: Found 1 translation units. [2023-09-01 06:54:07,457 INFO L172 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/goblint-regression/28-race_reach_72-funloop_hard_racing.i [2023-09-01 06:54:07,490 INFO L394 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ebc223dbb/c79cd03ff96b4c2aa69610439c961340/FLAGcd97fbf77 [2023-09-01 06:54:07,504 INFO L402 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ebc223dbb/c79cd03ff96b4c2aa69610439c961340 [2023-09-01 06:54:07,506 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-09-01 06:54:07,507 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2023-09-01 06:54:07,508 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-09-01 06:54:07,508 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-09-01 06:54:07,513 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2023-09-01 06:54:07,513 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 01.09 06:54:07" (1/1) ... [2023-09-01 06:54:07,514 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@408b6a88 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.09 06:54:07, skipping insertion in model container [2023-09-01 06:54:07,516 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 01.09 06:54:07" (1/1) ... [2023-09-01 06:54:07,520 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2023-09-01 06:54:07,557 INFO L178 MainTranslator]: Built tables and reachable declarations [2023-09-01 06:54:07,823 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_72-funloop_hard_racing.i[41323,41336] [2023-09-01 06:54:07,842 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-09-01 06:54:07,857 INFO L203 MainTranslator]: Completed pre-run [2023-09-01 06:54:07,876 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_72-funloop_hard_racing.i[41323,41336] [2023-09-01 06:54:07,883 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-09-01 06:54:07,917 INFO L208 MainTranslator]: Completed translation [2023-09-01 06:54:07,917 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.09 06:54:07 WrapperNode [2023-09-01 06:54:07,917 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-09-01 06:54:07,918 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-09-01 06:54:07,918 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-09-01 06:54:07,918 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2023-09-01 06:54:07,922 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.09 06:54:07" (1/1) ... [2023-09-01 06:54:07,933 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.09 06:54:07" (1/1) ... [2023-09-01 06:54:07,951 INFO L138 Inliner]: procedures = 271, calls = 41, calls flagged for inlining = 6, calls inlined = 7, statements flattened = 272 [2023-09-01 06:54:07,952 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-09-01 06:54:07,952 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-09-01 06:54:07,952 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2023-09-01 06:54:07,953 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2023-09-01 06:54:07,958 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.09 06:54:07" (1/1) ... [2023-09-01 06:54:07,958 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.09 06:54:07" (1/1) ... [2023-09-01 06:54:07,961 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.09 06:54:07" (1/1) ... [2023-09-01 06:54:07,971 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.09 06:54:07" (1/1) ... [2023-09-01 06:54:07,986 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.09 06:54:07" (1/1) ... [2023-09-01 06:54:07,990 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.09 06:54:07" (1/1) ... [2023-09-01 06:54:07,992 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.09 06:54:07" (1/1) ... [2023-09-01 06:54:07,993 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.09 06:54:07" (1/1) ... [2023-09-01 06:54:07,995 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-09-01 06:54:07,996 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-09-01 06:54:07,996 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2023-09-01 06:54:07,996 INFO L275 PluginConnector]: RCFGBuilder initialized [2023-09-01 06:54:07,996 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.09 06:54:07" (1/1) ... [2023-09-01 06:54:08,000 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-09-01 06:54:08,009 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-09-01 06:54:08,019 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-09-01 06:54:08,021 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-09-01 06:54:08,067 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-09-01 06:54:08,067 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-09-01 06:54:08,069 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-09-01 06:54:08,069 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-09-01 06:54:08,072 INFO L130 BoogieDeclarations]: Found specification of procedure #PthreadsMutexLock [2023-09-01 06:54:08,072 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-09-01 06:54:08,072 INFO L130 BoogieDeclarations]: Found specification of procedure t_fun [2023-09-01 06:54:08,072 INFO L138 BoogieDeclarations]: Found implementation of procedure t_fun [2023-09-01 06:54:08,072 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-09-01 06:54:08,072 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-09-01 06:54:08,072 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-09-01 06:54:08,074 WARN L210 CfgBuilder]: User set CodeBlockSize to SequenceOfStatements but program contains fork statements. Overwriting the user preferences and setting CodeBlockSize to OneNontrivialStatement [2023-09-01 06:54:08,184 INFO L236 CfgBuilder]: Building ICFG [2023-09-01 06:54:08,185 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-09-01 06:54:08,583 INFO L277 CfgBuilder]: Performing block encoding [2023-09-01 06:54:08,590 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-09-01 06:54:08,592 INFO L302 CfgBuilder]: Removed 35 assume(true) statements. [2023-09-01 06:54:08,595 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 01.09 06:54:08 BoogieIcfgContainer [2023-09-01 06:54:08,595 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-09-01 06:54:08,598 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-09-01 06:54:08,598 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2023-09-01 06:54:08,601 INFO L275 PluginConnector]: TraceAbstraction initialized [2023-09-01 06:54:08,601 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 01.09 06:54:07" (1/3) ... [2023-09-01 06:54:08,601 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@57cde467 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 01.09 06:54:08, skipping insertion in model container [2023-09-01 06:54:08,601 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.09 06:54:07" (2/3) ... [2023-09-01 06:54:08,602 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@57cde467 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 01.09 06:54:08, skipping insertion in model container [2023-09-01 06:54:08,602 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 01.09 06:54:08" (3/3) ... [2023-09-01 06:54:08,603 INFO L112 eAbstractionObserver]: Analyzing ICFG 28-race_reach_72-funloop_hard_racing.i [2023-09-01 06:54:08,609 WARN L145 ceAbstractionStarter]: Switching off computation of Hoare annotation because input is a concurrent program [2023-09-01 06:54:08,616 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-09-01 06:54:08,616 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 22 error locations. [2023-09-01 06:54:08,616 INFO L515 ceAbstractionStarter]: Constructing petrified ICFG for 1 thread instances. [2023-09-01 06:54:08,706 INFO L144 ThreadInstanceAdder]: Constructed 1 joinOtherThreadTransitions. [2023-09-01 06:54:08,743 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 245 places, 287 transitions, 582 flow [2023-09-01 06:54:08,858 INFO L130 PetriNetUnfolder]: 73/440 cut-off events. [2023-09-01 06:54:08,858 INFO L131 PetriNetUnfolder]: For 1/1 co-relation queries the response was YES. [2023-09-01 06:54:08,866 INFO L83 FinitePrefix]: Finished finitePrefix Result has 446 conditions, 440 events. 73/440 cut-off events. For 1/1 co-relation queries the response was YES. Maximal size of possible extension queue 18. Compared 2094 event pairs, 0 based on Foata normal form. 0/332 useless extension candidates. Maximal degree in co-relation 242. Up to 8 conditions per place. [2023-09-01 06:54:08,867 INFO L82 GeneralOperation]: Start removeDead. Operand has 245 places, 287 transitions, 582 flow [2023-09-01 06:54:08,898 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 235 places, 276 transitions, 557 flow [2023-09-01 06:54:08,901 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-09-01 06:54:08,918 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 235 places, 276 transitions, 557 flow [2023-09-01 06:54:08,923 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 235 places, 276 transitions, 557 flow [2023-09-01 06:54:08,923 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 235 places, 276 transitions, 557 flow [2023-09-01 06:54:08,970 INFO L130 PetriNetUnfolder]: 72/429 cut-off events. [2023-09-01 06:54:08,970 INFO L131 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2023-09-01 06:54:08,976 INFO L83 FinitePrefix]: Finished finitePrefix Result has 434 conditions, 429 events. 72/429 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 18. Compared 2007 event pairs, 0 based on Foata normal form. 0/325 useless extension candidates. Maximal degree in co-relation 242. Up to 8 conditions per place. [2023-09-01 06:54:08,986 INFO L119 LiptonReduction]: Number of co-enabled transitions 26080 [2023-09-01 06:54:11,919 INFO L134 LiptonReduction]: Checked pairs total: 39836 [2023-09-01 06:54:11,919 INFO L136 LiptonReduction]: Total number of compositions: 235 [2023-09-01 06:54:11,948 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == InUseError ======== [2023-09-01 06:54:11,953 INFO L357 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=PETRI_NET, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mPorIndependenceSettings=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@41ce39b, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-09-01 06:54:11,953 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-09-01 06:54:11,957 INFO L130 PetriNetUnfolder]: 14/56 cut-off events. [2023-09-01 06:54:11,958 INFO L131 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2023-09-01 06:54:11,958 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-09-01 06:54:11,958 INFO L208 CegarLoopForPetriNet]: trace histogram [2, 1, 1, 1, 1, 1] [2023-09-01 06:54:11,959 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-09-01 06:54:11,962 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-09-01 06:54:11,962 INFO L85 PathProgramCache]: Analyzing trace with hash -1842672750, now seen corresponding path program 1 times [2023-09-01 06:54:11,968 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-09-01 06:54:11,968 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [755400252] [2023-09-01 06:54:11,969 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-09-01 06:54:11,969 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-09-01 06:54:12,035 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-09-01 06:54:12,118 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-09-01 06:54:12,118 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-09-01 06:54:12,118 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [755400252] [2023-09-01 06:54:12,119 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [755400252] provided 1 perfect and 0 imperfect interpolant sequences [2023-09-01 06:54:12,119 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-09-01 06:54:12,119 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-09-01 06:54:12,120 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1441572738] [2023-09-01 06:54:12,121 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-09-01 06:54:12,126 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-09-01 06:54:12,129 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-09-01 06:54:12,142 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-09-01 06:54:12,142 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-09-01 06:54:12,163 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 240 out of 522 [2023-09-01 06:54:12,166 INFO L100 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 80 places, 113 transitions, 231 flow. Second operand has 3 states, 3 states have (on average 241.66666666666666) internal successors, (725), 3 states have internal predecessors, (725), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-09-01 06:54:12,166 INFO L109 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-09-01 06:54:12,167 INFO L110 encePairwiseOnDemand]: Number of universal subtrahend loopers: 240 of 522 [2023-09-01 06:54:12,167 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-09-01 06:54:12,401 INFO L130 PetriNetUnfolder]: 1055/2184 cut-off events. [2023-09-01 06:54:12,402 INFO L131 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2023-09-01 06:54:12,403 INFO L83 FinitePrefix]: Finished finitePrefix Result has 4172 conditions, 2184 events. 1055/2184 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 150. Compared 14581 event pairs, 903 based on Foata normal form. 289/1783 useless extension candidates. Maximal degree in co-relation 4065. Up to 1982 conditions per place. [2023-09-01 06:54:12,406 INFO L137 encePairwiseOnDemand]: 489/522 looper letters, 30 selfloop transitions, 2 changer transitions 47/84 dead transitions. [2023-09-01 06:54:12,406 INFO L142 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 82 places, 84 transitions, 315 flow [2023-09-01 06:54:12,407 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-09-01 06:54:12,409 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-09-01 06:54:12,414 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 822 transitions. [2023-09-01 06:54:12,417 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.524904214559387 [2023-09-01 06:54:12,417 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 822 transitions. [2023-09-01 06:54:12,418 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 822 transitions. [2023-09-01 06:54:12,419 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-09-01 06:54:12,421 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 822 transitions. [2023-09-01 06:54:12,424 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 274.0) internal successors, (822), 3 states have internal predecessors, (822), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-09-01 06:54:12,429 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 522.0) internal successors, (2088), 4 states have internal predecessors, (2088), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-09-01 06:54:12,430 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 522.0) internal successors, (2088), 4 states have internal predecessors, (2088), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-09-01 06:54:12,431 INFO L175 Difference]: Start difference. First operand has 80 places, 113 transitions, 231 flow. Second operand 3 states and 822 transitions. [2023-09-01 06:54:12,431 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 82 places, 84 transitions, 315 flow [2023-09-01 06:54:12,433 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 82 places, 84 transitions, 315 flow, removed 0 selfloop flow, removed 0 redundant places. [2023-09-01 06:54:12,434 INFO L231 Difference]: Finished difference. Result has 83 places, 37 transitions, 89 flow [2023-09-01 06:54:12,436 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=522, PETRI_DIFFERENCE_MINUEND_FLOW=171, PETRI_DIFFERENCE_MINUEND_PLACES=80, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=83, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=81, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=89, PETRI_PLACES=83, PETRI_TRANSITIONS=37} [2023-09-01 06:54:12,438 INFO L281 CegarLoopForPetriNet]: 80 programPoint places, 3 predicate places. [2023-09-01 06:54:12,438 INFO L495 AbstractCegarLoop]: Abstraction has has 83 places, 37 transitions, 89 flow [2023-09-01 06:54:12,438 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 241.66666666666666) internal successors, (725), 3 states have internal predecessors, (725), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-09-01 06:54:12,439 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-09-01 06:54:12,439 INFO L208 CegarLoopForPetriNet]: trace histogram [2, 1, 1, 1, 1, 1, 1] [2023-09-01 06:54:12,439 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-09-01 06:54:12,439 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-09-01 06:54:12,439 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-09-01 06:54:12,440 INFO L85 PathProgramCache]: Analyzing trace with hash 153132088, now seen corresponding path program 1 times [2023-09-01 06:54:12,440 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-09-01 06:54:12,440 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [299006661] [2023-09-01 06:54:12,440 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-09-01 06:54:12,440 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-09-01 06:54:12,453 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-09-01 06:54:12,496 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-09-01 06:54:12,497 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-09-01 06:54:12,497 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [299006661] [2023-09-01 06:54:12,497 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [299006661] provided 0 perfect and 1 imperfect interpolant sequences [2023-09-01 06:54:12,497 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1892700220] [2023-09-01 06:54:12,497 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-09-01 06:54:12,497 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-09-01 06:54:12,497 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-09-01 06:54:12,500 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-09-01 06:54:12,523 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-09-01 06:54:12,615 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-09-01 06:54:12,617 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 3 conjunts are in the unsatisfiable core [2023-09-01 06:54:12,620 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2023-09-01 06:54:12,646 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-09-01 06:54:12,647 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2023-09-01 06:54:12,658 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-09-01 06:54:12,658 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1892700220] provided 0 perfect and 2 imperfect interpolant sequences [2023-09-01 06:54:12,658 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-09-01 06:54:12,658 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 6 [2023-09-01 06:54:12,659 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1240093415] [2023-09-01 06:54:12,659 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-09-01 06:54:12,660 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-09-01 06:54:12,660 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-09-01 06:54:12,660 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-09-01 06:54:12,660 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2023-09-01 06:54:12,677 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 239 out of 522 [2023-09-01 06:54:12,679 INFO L100 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 83 places, 37 transitions, 89 flow. Second operand has 7 states, 7 states have (on average 240.57142857142858) internal successors, (1684), 7 states have internal predecessors, (1684), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-09-01 06:54:12,679 INFO L109 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-09-01 06:54:12,679 INFO L110 encePairwiseOnDemand]: Number of universal subtrahend loopers: 239 of 522 [2023-09-01 06:54:12,679 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-09-01 06:54:12,790 INFO L130 PetriNetUnfolder]: 118/277 cut-off events. [2023-09-01 06:54:12,790 INFO L131 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2023-09-01 06:54:12,790 INFO L83 FinitePrefix]: Finished finitePrefix Result has 545 conditions, 277 events. 118/277 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 22. Compared 1049 event pairs, 105 based on Foata normal form. 0/167 useless extension candidates. Maximal degree in co-relation 533. Up to 249 conditions per place. [2023-09-01 06:54:12,791 INFO L137 encePairwiseOnDemand]: 519/522 looper letters, 30 selfloop transitions, 5 changer transitions 0/40 dead transitions. [2023-09-01 06:54:12,791 INFO L142 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 44 places, 40 transitions, 171 flow [2023-09-01 06:54:12,791 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-09-01 06:54:12,792 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6 states. [2023-09-01 06:54:12,794 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6 states to 6 states and 1472 transitions. [2023-09-01 06:54:12,794 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.46998722860791825 [2023-09-01 06:54:12,794 INFO L72 ComplementDD]: Start complementDD. Operand 6 states and 1472 transitions. [2023-09-01 06:54:12,794 INFO L73 IsDeterministic]: Start isDeterministic. Operand 6 states and 1472 transitions. [2023-09-01 06:54:12,795 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-09-01 06:54:12,795 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 6 states and 1472 transitions. [2023-09-01 06:54:12,797 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 7 states, 6 states have (on average 245.33333333333334) internal successors, (1472), 6 states have internal predecessors, (1472), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-09-01 06:54:12,805 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 7 states, 7 states have (on average 522.0) internal successors, (3654), 7 states have internal predecessors, (3654), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-09-01 06:54:12,806 INFO L81 ComplementDD]: Finished complementDD. Result has 7 states, 7 states have (on average 522.0) internal successors, (3654), 7 states have internal predecessors, (3654), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-09-01 06:54:12,820 INFO L175 Difference]: Start difference. First operand has 83 places, 37 transitions, 89 flow. Second operand 6 states and 1472 transitions. [2023-09-01 06:54:12,821 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 44 places, 40 transitions, 171 flow [2023-09-01 06:54:12,821 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 43 places, 40 transitions, 167 flow, removed 1 selfloop flow, removed 1 redundant places. [2023-09-01 06:54:12,822 INFO L231 Difference]: Finished difference. Result has 46 places, 40 transitions, 121 flow [2023-09-01 06:54:12,822 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=522, PETRI_DIFFERENCE_MINUEND_FLOW=85, PETRI_DIFFERENCE_MINUEND_PLACES=38, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=37, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=3, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=34, PETRI_DIFFERENCE_SUBTRAHEND_STATES=6, PETRI_FLOW=121, PETRI_PLACES=46, PETRI_TRANSITIONS=40} [2023-09-01 06:54:12,823 INFO L281 CegarLoopForPetriNet]: 80 programPoint places, -34 predicate places. [2023-09-01 06:54:12,823 INFO L495 AbstractCegarLoop]: Abstraction has has 46 places, 40 transitions, 121 flow [2023-09-01 06:54:12,824 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 240.57142857142858) internal successors, (1684), 7 states have internal predecessors, (1684), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-09-01 06:54:12,824 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-09-01 06:54:12,824 INFO L208 CegarLoopForPetriNet]: trace histogram [4, 2, 1, 1, 1, 1, 1] [2023-09-01 06:54:12,836 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-09-01 06:54:13,024 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-09-01 06:54:13,025 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-09-01 06:54:13,025 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-09-01 06:54:13,025 INFO L85 PathProgramCache]: Analyzing trace with hash 1801258258, now seen corresponding path program 2 times [2023-09-01 06:54:13,026 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-09-01 06:54:13,026 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1954777274] [2023-09-01 06:54:13,026 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-09-01 06:54:13,026 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-09-01 06:54:13,043 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-09-01 06:54:13,157 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-09-01 06:54:13,157 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-09-01 06:54:13,157 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1954777274] [2023-09-01 06:54:13,157 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1954777274] provided 0 perfect and 1 imperfect interpolant sequences [2023-09-01 06:54:13,157 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1666382921] [2023-09-01 06:54:13,158 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2023-09-01 06:54:13,158 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-09-01 06:54:13,158 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-09-01 06:54:13,170 INFO L229 MonitoredProcess]: Starting monitored process 3 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-09-01 06:54:13,201 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-09-01 06:54:13,248 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2023-09-01 06:54:13,248 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-09-01 06:54:13,249 INFO L263 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 6 conjunts are in the unsatisfiable core [2023-09-01 06:54:13,250 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2023-09-01 06:54:13,267 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-09-01 06:54:13,267 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2023-09-01 06:54:13,311 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-09-01 06:54:13,311 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1666382921] provided 0 perfect and 2 imperfect interpolant sequences [2023-09-01 06:54:13,312 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-09-01 06:54:13,312 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 12 [2023-09-01 06:54:13,312 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1544058434] [2023-09-01 06:54:13,312 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-09-01 06:54:13,313 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2023-09-01 06:54:13,313 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-09-01 06:54:13,313 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2023-09-01 06:54:13,313 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=78, Unknown=0, NotChecked=0, Total=156 [2023-09-01 06:54:13,359 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 239 out of 522 [2023-09-01 06:54:13,362 INFO L100 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 46 places, 40 transitions, 121 flow. Second operand has 13 states, 13 states have (on average 240.30769230769232) internal successors, (3124), 13 states have internal predecessors, (3124), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-09-01 06:54:13,362 INFO L109 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-09-01 06:54:13,362 INFO L110 encePairwiseOnDemand]: Number of universal subtrahend loopers: 239 of 522 [2023-09-01 06:54:13,363 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-09-01 06:54:13,455 INFO L130 PetriNetUnfolder]: 118/283 cut-off events. [2023-09-01 06:54:13,455 INFO L131 PetriNetUnfolder]: For 20/20 co-relation queries the response was YES. [2023-09-01 06:54:13,455 INFO L83 FinitePrefix]: Finished finitePrefix Result has 582 conditions, 283 events. 118/283 cut-off events. For 20/20 co-relation queries the response was YES. Maximal size of possible extension queue 22. Compared 1049 event pairs, 105 based on Foata normal form. 6/180 useless extension candidates. Maximal degree in co-relation 524. Up to 249 conditions per place. [2023-09-01 06:54:13,456 INFO L137 encePairwiseOnDemand]: 519/522 looper letters, 30 selfloop transitions, 11 changer transitions 0/46 dead transitions. [2023-09-01 06:54:13,456 INFO L142 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 57 places, 46 transitions, 239 flow [2023-09-01 06:54:13,457 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2023-09-01 06:54:13,457 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2023-09-01 06:54:13,460 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 2915 transitions. [2023-09-01 06:54:13,462 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.46535759897828866 [2023-09-01 06:54:13,462 INFO L72 ComplementDD]: Start complementDD. Operand 12 states and 2915 transitions. [2023-09-01 06:54:13,462 INFO L73 IsDeterministic]: Start isDeterministic. Operand 12 states and 2915 transitions. [2023-09-01 06:54:13,463 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-09-01 06:54:13,463 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 12 states and 2915 transitions. [2023-09-01 06:54:13,467 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 13 states, 12 states have (on average 242.91666666666666) internal successors, (2915), 12 states have internal predecessors, (2915), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-09-01 06:54:13,474 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 13 states, 13 states have (on average 522.0) internal successors, (6786), 13 states have internal predecessors, (6786), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-09-01 06:54:13,476 INFO L81 ComplementDD]: Finished complementDD. Result has 13 states, 13 states have (on average 522.0) internal successors, (6786), 13 states have internal predecessors, (6786), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-09-01 06:54:13,477 INFO L175 Difference]: Start difference. First operand has 46 places, 40 transitions, 121 flow. Second operand 12 states and 2915 transitions. [2023-09-01 06:54:13,477 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 57 places, 46 transitions, 239 flow [2023-09-01 06:54:13,478 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 56 places, 46 transitions, 225 flow, removed 6 selfloop flow, removed 1 redundant places. [2023-09-01 06:54:13,479 INFO L231 Difference]: Finished difference. Result has 62 places, 46 transitions, 191 flow [2023-09-01 06:54:13,479 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=522, PETRI_DIFFERENCE_MINUEND_FLOW=107, PETRI_DIFFERENCE_MINUEND_PLACES=45, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=40, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=6, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=34, PETRI_DIFFERENCE_SUBTRAHEND_STATES=12, PETRI_FLOW=191, PETRI_PLACES=62, PETRI_TRANSITIONS=46} [2023-09-01 06:54:13,480 INFO L281 CegarLoopForPetriNet]: 80 programPoint places, -18 predicate places. [2023-09-01 06:54:13,480 INFO L495 AbstractCegarLoop]: Abstraction has has 62 places, 46 transitions, 191 flow [2023-09-01 06:54:13,481 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 240.30769230769232) internal successors, (3124), 13 states have internal predecessors, (3124), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-09-01 06:54:13,481 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-09-01 06:54:13,481 INFO L208 CegarLoopForPetriNet]: trace histogram [10, 2, 1, 1, 1, 1, 1] [2023-09-01 06:54:13,486 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2023-09-01 06:54:13,686 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2023-09-01 06:54:13,687 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-09-01 06:54:13,687 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-09-01 06:54:13,687 INFO L85 PathProgramCache]: Analyzing trace with hash -1733848238, now seen corresponding path program 3 times [2023-09-01 06:54:13,687 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-09-01 06:54:13,688 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [172845864] [2023-09-01 06:54:13,688 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-09-01 06:54:13,688 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-09-01 06:54:13,711 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-09-01 06:54:13,711 INFO L356 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2023-09-01 06:54:13,724 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-09-01 06:54:13,742 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2023-09-01 06:54:13,742 INFO L360 BasicCegarLoop]: Counterexample is feasible [2023-09-01 06:54:13,743 INFO L805 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (0 of 1 remaining) [2023-09-01 06:54:13,744 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2023-09-01 06:54:13,744 INFO L445 BasicCegarLoop]: Path program histogram: [3, 1] [2023-09-01 06:54:13,745 INFO L307 ceAbstractionStarter]: Result for error location InUseError was UNSAFE (1/2) [2023-09-01 06:54:13,746 WARN L233 ceAbstractionStarter]: 1 thread instances were not sufficient, I will increase this number and restart the analysis [2023-09-01 06:54:13,746 INFO L515 ceAbstractionStarter]: Constructing petrified ICFG for 2 thread instances. [2023-09-01 06:54:13,768 INFO L144 ThreadInstanceAdder]: Constructed 2 joinOtherThreadTransitions. [2023-09-01 06:54:13,771 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 314 places, 369 transitions, 756 flow [2023-09-01 06:54:13,844 INFO L130 PetriNetUnfolder]: 118/711 cut-off events. [2023-09-01 06:54:13,844 INFO L131 PetriNetUnfolder]: For 6/6 co-relation queries the response was YES. [2023-09-01 06:54:13,848 INFO L83 FinitePrefix]: Finished finitePrefix Result has 725 conditions, 711 events. 118/711 cut-off events. For 6/6 co-relation queries the response was YES. Maximal size of possible extension queue 22. Compared 3792 event pairs, 0 based on Foata normal form. 0/535 useless extension candidates. Maximal degree in co-relation 442. Up to 12 conditions per place. [2023-09-01 06:54:13,849 INFO L82 GeneralOperation]: Start removeDead. Operand has 314 places, 369 transitions, 756 flow [2023-09-01 06:54:13,853 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 312 places, 367 transitions, 752 flow [2023-09-01 06:54:13,853 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-09-01 06:54:13,853 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 312 places, 367 transitions, 752 flow [2023-09-01 06:54:13,854 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 312 places, 367 transitions, 752 flow [2023-09-01 06:54:13,854 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 312 places, 367 transitions, 752 flow [2023-09-01 06:54:13,908 INFO L130 PetriNetUnfolder]: 118/709 cut-off events. [2023-09-01 06:54:13,908 INFO L131 PetriNetUnfolder]: For 6/6 co-relation queries the response was YES. [2023-09-01 06:54:13,913 INFO L83 FinitePrefix]: Finished finitePrefix Result has 723 conditions, 709 events. 118/709 cut-off events. For 6/6 co-relation queries the response was YES. Maximal size of possible extension queue 22. Compared 3785 event pairs, 0 based on Foata normal form. 0/535 useless extension candidates. Maximal degree in co-relation 440. Up to 12 conditions per place. [2023-09-01 06:54:13,932 INFO L119 LiptonReduction]: Number of co-enabled transitions 68000 [2023-09-01 06:54:17,272 INFO L134 LiptonReduction]: Checked pairs total: 121234 [2023-09-01 06:54:17,273 INFO L136 LiptonReduction]: Total number of compositions: 298 [2023-09-01 06:54:17,279 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == InUseError ======== [2023-09-01 06:54:17,281 INFO L357 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=PETRI_NET, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mPorIndependenceSettings=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@41ce39b, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-09-01 06:54:17,282 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-09-01 06:54:17,292 INFO L130 PetriNetUnfolder]: 53/180 cut-off events. [2023-09-01 06:54:17,293 INFO L131 PetriNetUnfolder]: For 3/3 co-relation queries the response was YES. [2023-09-01 06:54:17,293 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-09-01 06:54:17,293 INFO L208 CegarLoopForPetriNet]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1] [2023-09-01 06:54:17,294 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-09-01 06:54:17,294 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-09-01 06:54:17,294 INFO L85 PathProgramCache]: Analyzing trace with hash 239477515, now seen corresponding path program 1 times [2023-09-01 06:54:17,295 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-09-01 06:54:17,295 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [283251234] [2023-09-01 06:54:17,295 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-09-01 06:54:17,296 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-09-01 06:54:17,316 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-09-01 06:54:17,355 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-09-01 06:54:17,355 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-09-01 06:54:17,355 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [283251234] [2023-09-01 06:54:17,355 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [283251234] provided 1 perfect and 0 imperfect interpolant sequences [2023-09-01 06:54:17,356 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-09-01 06:54:17,356 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-09-01 06:54:17,356 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [294240205] [2023-09-01 06:54:17,356 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-09-01 06:54:17,356 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-09-01 06:54:17,357 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-09-01 06:54:17,357 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-09-01 06:54:17,358 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-09-01 06:54:17,366 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 307 out of 667 [2023-09-01 06:54:17,367 INFO L100 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 112 places, 158 transitions, 334 flow. Second operand has 3 states, 3 states have (on average 309.0) internal successors, (927), 3 states have internal predecessors, (927), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-09-01 06:54:17,367 INFO L109 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-09-01 06:54:17,367 INFO L110 encePairwiseOnDemand]: Number of universal subtrahend loopers: 307 of 667 [2023-09-01 06:54:17,367 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-09-01 06:54:21,750 INFO L130 PetriNetUnfolder]: 52323/79071 cut-off events. [2023-09-01 06:54:21,752 INFO L131 PetriNetUnfolder]: For 186/186 co-relation queries the response was YES. [2023-09-01 06:54:21,895 INFO L83 FinitePrefix]: Finished finitePrefix Result has 154707 conditions, 79071 events. 52323/79071 cut-off events. For 186/186 co-relation queries the response was YES. Maximal size of possible extension queue 2612. Compared 612159 event pairs, 47170 based on Foata normal form. 9339/61849 useless extension candidates. Maximal degree in co-relation 72853. Up to 75495 conditions per place. [2023-09-01 06:54:21,992 INFO L137 encePairwiseOnDemand]: 623/667 looper letters, 56 selfloop transitions, 2 changer transitions 53/118 dead transitions. [2023-09-01 06:54:21,993 INFO L142 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 114 places, 118 transitions, 458 flow [2023-09-01 06:54:21,994 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-09-01 06:54:21,994 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-09-01 06:54:21,996 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 1065 transitions. [2023-09-01 06:54:21,996 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.5322338830584707 [2023-09-01 06:54:21,996 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 1065 transitions. [2023-09-01 06:54:21,997 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 1065 transitions. [2023-09-01 06:54:21,997 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-09-01 06:54:21,997 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 1065 transitions. [2023-09-01 06:54:21,999 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 355.0) internal successors, (1065), 3 states have internal predecessors, (1065), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-09-01 06:54:22,001 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 667.0) internal successors, (2668), 4 states have internal predecessors, (2668), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-09-01 06:54:22,001 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 667.0) internal successors, (2668), 4 states have internal predecessors, (2668), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-09-01 06:54:22,001 INFO L175 Difference]: Start difference. First operand has 112 places, 158 transitions, 334 flow. Second operand 3 states and 1065 transitions. [2023-09-01 06:54:22,002 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 114 places, 118 transitions, 458 flow [2023-09-01 06:54:22,003 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 114 places, 118 transitions, 458 flow, removed 0 selfloop flow, removed 0 redundant places. [2023-09-01 06:54:22,005 INFO L231 Difference]: Finished difference. Result has 115 places, 65 transitions, 152 flow [2023-09-01 06:54:22,005 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=667, PETRI_DIFFERENCE_MINUEND_FLOW=252, PETRI_DIFFERENCE_MINUEND_PLACES=112, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=117, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=115, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=152, PETRI_PLACES=115, PETRI_TRANSITIONS=65} [2023-09-01 06:54:22,006 INFO L281 CegarLoopForPetriNet]: 112 programPoint places, 3 predicate places. [2023-09-01 06:54:22,006 INFO L495 AbstractCegarLoop]: Abstraction has has 115 places, 65 transitions, 152 flow [2023-09-01 06:54:22,006 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 309.0) internal successors, (927), 3 states have internal predecessors, (927), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-09-01 06:54:22,006 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-09-01 06:54:22,006 INFO L208 CegarLoopForPetriNet]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1] [2023-09-01 06:54:22,007 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2023-09-01 06:54:22,007 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-09-01 06:54:22,007 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-09-01 06:54:22,007 INFO L85 PathProgramCache]: Analyzing trace with hash -122748961, now seen corresponding path program 1 times [2023-09-01 06:54:22,007 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-09-01 06:54:22,007 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1318627954] [2023-09-01 06:54:22,008 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-09-01 06:54:22,008 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-09-01 06:54:22,026 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-09-01 06:54:22,048 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-09-01 06:54:22,048 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-09-01 06:54:22,048 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1318627954] [2023-09-01 06:54:22,048 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1318627954] provided 0 perfect and 1 imperfect interpolant sequences [2023-09-01 06:54:22,049 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [237371461] [2023-09-01 06:54:22,049 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-09-01 06:54:22,049 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-09-01 06:54:22,049 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-09-01 06:54:22,059 INFO L229 MonitoredProcess]: Starting monitored process 4 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-09-01 06:54:22,061 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-09-01 06:54:22,279 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-09-01 06:54:22,281 INFO L263 TraceCheckSpWp]: Trace formula consists of 124 conjuncts, 3 conjunts are in the unsatisfiable core [2023-09-01 06:54:22,282 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2023-09-01 06:54:22,292 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-09-01 06:54:22,293 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2023-09-01 06:54:22,307 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-09-01 06:54:22,308 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [237371461] provided 0 perfect and 2 imperfect interpolant sequences [2023-09-01 06:54:22,308 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-09-01 06:54:22,308 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 6 [2023-09-01 06:54:22,308 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1110684983] [2023-09-01 06:54:22,308 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-09-01 06:54:22,309 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-09-01 06:54:22,309 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-09-01 06:54:22,310 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-09-01 06:54:22,311 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2023-09-01 06:54:22,324 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 306 out of 667 [2023-09-01 06:54:22,329 INFO L100 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 115 places, 65 transitions, 152 flow. Second operand has 7 states, 7 states have (on average 307.7142857142857) internal successors, (2154), 7 states have internal predecessors, (2154), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-09-01 06:54:22,329 INFO L109 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-09-01 06:54:22,330 INFO L110 encePairwiseOnDemand]: Number of universal subtrahend loopers: 306 of 667 [2023-09-01 06:54:22,330 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-09-01 06:54:22,960 INFO L130 PetriNetUnfolder]: 6470/10111 cut-off events. [2023-09-01 06:54:22,960 INFO L131 PetriNetUnfolder]: For 77/77 co-relation queries the response was YES. [2023-09-01 06:54:22,975 INFO L83 FinitePrefix]: Finished finitePrefix Result has 19895 conditions, 10111 events. 6470/10111 cut-off events. For 77/77 co-relation queries the response was YES. Maximal size of possible extension queue 449. Compared 65212 event pairs, 5929 based on Foata normal form. 0/6051 useless extension candidates. Maximal degree in co-relation 19882. Up to 9679 conditions per place. [2023-09-01 06:54:23,000 INFO L137 encePairwiseOnDemand]: 664/667 looper letters, 56 selfloop transitions, 5 changer transitions 0/68 dead transitions. [2023-09-01 06:54:23,001 INFO L142 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 72 places, 68 transitions, 286 flow [2023-09-01 06:54:23,001 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-09-01 06:54:23,001 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6 states. [2023-09-01 06:54:23,004 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6 states to 6 states and 1900 transitions. [2023-09-01 06:54:23,005 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.47476261869065467 [2023-09-01 06:54:23,005 INFO L72 ComplementDD]: Start complementDD. Operand 6 states and 1900 transitions. [2023-09-01 06:54:23,005 INFO L73 IsDeterministic]: Start isDeterministic. Operand 6 states and 1900 transitions. [2023-09-01 06:54:23,006 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-09-01 06:54:23,006 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 6 states and 1900 transitions. [2023-09-01 06:54:23,008 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 7 states, 6 states have (on average 316.6666666666667) internal successors, (1900), 6 states have internal predecessors, (1900), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-09-01 06:54:23,012 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 7 states, 7 states have (on average 667.0) internal successors, (4669), 7 states have internal predecessors, (4669), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-09-01 06:54:23,013 INFO L81 ComplementDD]: Finished complementDD. Result has 7 states, 7 states have (on average 667.0) internal successors, (4669), 7 states have internal predecessors, (4669), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-09-01 06:54:23,014 INFO L175 Difference]: Start difference. First operand has 115 places, 65 transitions, 152 flow. Second operand 6 states and 1900 transitions. [2023-09-01 06:54:23,014 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 72 places, 68 transitions, 286 flow [2023-09-01 06:54:23,015 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 71 places, 68 transitions, 280 flow, removed 2 selfloop flow, removed 1 redundant places. [2023-09-01 06:54:23,015 INFO L231 Difference]: Finished difference. Result has 74 places, 68 transitions, 182 flow [2023-09-01 06:54:23,016 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=667, PETRI_DIFFERENCE_MINUEND_FLOW=146, PETRI_DIFFERENCE_MINUEND_PLACES=66, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=65, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=3, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=62, PETRI_DIFFERENCE_SUBTRAHEND_STATES=6, PETRI_FLOW=182, PETRI_PLACES=74, PETRI_TRANSITIONS=68} [2023-09-01 06:54:23,016 INFO L281 CegarLoopForPetriNet]: 112 programPoint places, -38 predicate places. [2023-09-01 06:54:23,016 INFO L495 AbstractCegarLoop]: Abstraction has has 74 places, 68 transitions, 182 flow [2023-09-01 06:54:23,017 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 307.7142857142857) internal successors, (2154), 7 states have internal predecessors, (2154), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-09-01 06:54:23,017 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-09-01 06:54:23,017 INFO L208 CegarLoopForPetriNet]: trace histogram [4, 3, 2, 2, 1, 1, 1, 1, 1] [2023-09-01 06:54:23,024 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2023-09-01 06:54:23,222 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-09-01 06:54:23,223 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-09-01 06:54:23,223 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-09-01 06:54:23,223 INFO L85 PathProgramCache]: Analyzing trace with hash -805259253, now seen corresponding path program 2 times [2023-09-01 06:54:23,223 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-09-01 06:54:23,224 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [117883927] [2023-09-01 06:54:23,224 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-09-01 06:54:23,224 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-09-01 06:54:23,245 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-09-01 06:54:23,311 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-09-01 06:54:23,311 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-09-01 06:54:23,311 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [117883927] [2023-09-01 06:54:23,311 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [117883927] provided 0 perfect and 1 imperfect interpolant sequences [2023-09-01 06:54:23,311 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [481709577] [2023-09-01 06:54:23,312 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2023-09-01 06:54:23,312 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-09-01 06:54:23,312 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-09-01 06:54:23,325 INFO L229 MonitoredProcess]: Starting monitored process 5 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-09-01 06:54:23,346 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-09-01 06:54:23,410 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2023-09-01 06:54:23,411 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-09-01 06:54:23,411 INFO L263 TraceCheckSpWp]: Trace formula consists of 148 conjuncts, 6 conjunts are in the unsatisfiable core [2023-09-01 06:54:23,412 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2023-09-01 06:54:23,425 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-09-01 06:54:23,426 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2023-09-01 06:54:23,470 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-09-01 06:54:23,471 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [481709577] provided 0 perfect and 2 imperfect interpolant sequences [2023-09-01 06:54:23,471 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-09-01 06:54:23,471 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 12 [2023-09-01 06:54:23,471 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1192448485] [2023-09-01 06:54:23,472 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-09-01 06:54:23,472 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2023-09-01 06:54:23,472 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-09-01 06:54:23,473 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2023-09-01 06:54:23,473 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=78, Unknown=0, NotChecked=0, Total=156 [2023-09-01 06:54:23,500 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 306 out of 667 [2023-09-01 06:54:23,503 INFO L100 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 74 places, 68 transitions, 182 flow. Second operand has 13 states, 13 states have (on average 307.38461538461536) internal successors, (3996), 13 states have internal predecessors, (3996), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-09-01 06:54:23,503 INFO L109 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-09-01 06:54:23,503 INFO L110 encePairwiseOnDemand]: Number of universal subtrahend loopers: 306 of 667 [2023-09-01 06:54:23,503 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-09-01 06:54:24,194 INFO L130 PetriNetUnfolder]: 6470/10117 cut-off events. [2023-09-01 06:54:24,195 INFO L131 PetriNetUnfolder]: For 90/90 co-relation queries the response was YES. [2023-09-01 06:54:24,210 INFO L83 FinitePrefix]: Finished finitePrefix Result has 19925 conditions, 10117 events. 6470/10117 cut-off events. For 90/90 co-relation queries the response was YES. Maximal size of possible extension queue 449. Compared 65241 event pairs, 5929 based on Foata normal form. 6/6064 useless extension candidates. Maximal degree in co-relation 19866. Up to 9679 conditions per place. [2023-09-01 06:54:24,236 INFO L137 encePairwiseOnDemand]: 664/667 looper letters, 56 selfloop transitions, 11 changer transitions 0/74 dead transitions. [2023-09-01 06:54:24,236 INFO L142 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 85 places, 74 transitions, 352 flow [2023-09-01 06:54:24,237 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2023-09-01 06:54:24,237 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2023-09-01 06:54:24,242 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 3745 transitions. [2023-09-01 06:54:24,244 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.46789105447276363 [2023-09-01 06:54:24,244 INFO L72 ComplementDD]: Start complementDD. Operand 12 states and 3745 transitions. [2023-09-01 06:54:24,244 INFO L73 IsDeterministic]: Start isDeterministic. Operand 12 states and 3745 transitions. [2023-09-01 06:54:24,245 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-09-01 06:54:24,245 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 12 states and 3745 transitions. [2023-09-01 06:54:24,251 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 13 states, 12 states have (on average 312.0833333333333) internal successors, (3745), 12 states have internal predecessors, (3745), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-09-01 06:54:24,259 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 13 states, 13 states have (on average 667.0) internal successors, (8671), 13 states have internal predecessors, (8671), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-09-01 06:54:24,261 INFO L81 ComplementDD]: Finished complementDD. Result has 13 states, 13 states have (on average 667.0) internal successors, (8671), 13 states have internal predecessors, (8671), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-09-01 06:54:24,261 INFO L175 Difference]: Start difference. First operand has 74 places, 68 transitions, 182 flow. Second operand 12 states and 3745 transitions. [2023-09-01 06:54:24,261 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 85 places, 74 transitions, 352 flow [2023-09-01 06:54:24,262 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 84 places, 74 transitions, 338 flow, removed 6 selfloop flow, removed 1 redundant places. [2023-09-01 06:54:24,263 INFO L231 Difference]: Finished difference. Result has 90 places, 74 transitions, 252 flow [2023-09-01 06:54:24,264 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=667, PETRI_DIFFERENCE_MINUEND_FLOW=168, PETRI_DIFFERENCE_MINUEND_PLACES=73, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=68, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=6, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=62, PETRI_DIFFERENCE_SUBTRAHEND_STATES=12, PETRI_FLOW=252, PETRI_PLACES=90, PETRI_TRANSITIONS=74} [2023-09-01 06:54:24,264 INFO L281 CegarLoopForPetriNet]: 112 programPoint places, -22 predicate places. [2023-09-01 06:54:24,264 INFO L495 AbstractCegarLoop]: Abstraction has has 90 places, 74 transitions, 252 flow [2023-09-01 06:54:24,266 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 307.38461538461536) internal successors, (3996), 13 states have internal predecessors, (3996), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-09-01 06:54:24,266 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-09-01 06:54:24,266 INFO L208 CegarLoopForPetriNet]: trace histogram [10, 3, 2, 2, 1, 1, 1, 1, 1] [2023-09-01 06:54:24,271 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-09-01 06:54:24,470 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-09-01 06:54:24,470 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-09-01 06:54:24,471 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-09-01 06:54:24,471 INFO L85 PathProgramCache]: Analyzing trace with hash -1484658805, now seen corresponding path program 3 times [2023-09-01 06:54:24,471 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-09-01 06:54:24,471 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [380792280] [2023-09-01 06:54:24,471 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-09-01 06:54:24,471 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-09-01 06:54:24,506 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-09-01 06:54:24,506 INFO L356 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2023-09-01 06:54:24,529 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-09-01 06:54:24,541 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2023-09-01 06:54:24,541 INFO L360 BasicCegarLoop]: Counterexample is feasible [2023-09-01 06:54:24,542 INFO L805 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (0 of 1 remaining) [2023-09-01 06:54:24,542 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2023-09-01 06:54:24,542 INFO L445 BasicCegarLoop]: Path program histogram: [3, 1] [2023-09-01 06:54:24,543 INFO L307 ceAbstractionStarter]: Result for error location InUseError was UNSAFE (1/2) [2023-09-01 06:54:24,543 WARN L233 ceAbstractionStarter]: 2 thread instances were not sufficient, I will increase this number and restart the analysis [2023-09-01 06:54:24,543 INFO L515 ceAbstractionStarter]: Constructing petrified ICFG for 3 thread instances. [2023-09-01 06:54:24,573 INFO L144 ThreadInstanceAdder]: Constructed 3 joinOtherThreadTransitions. [2023-09-01 06:54:24,577 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 383 places, 451 transitions, 932 flow [2023-09-01 06:54:24,689 INFO L130 PetriNetUnfolder]: 168/1021 cut-off events. [2023-09-01 06:54:24,689 INFO L131 PetriNetUnfolder]: For 19/19 co-relation queries the response was YES. [2023-09-01 06:54:24,706 INFO L83 FinitePrefix]: Finished finitePrefix Result has 1049 conditions, 1021 events. 168/1021 cut-off events. For 19/19 co-relation queries the response was YES. Maximal size of possible extension queue 24. Compared 5733 event pairs, 1 based on Foata normal form. 0/769 useless extension candidates. Maximal degree in co-relation 719. Up to 16 conditions per place. [2023-09-01 06:54:24,706 INFO L82 GeneralOperation]: Start removeDead. Operand has 383 places, 451 transitions, 932 flow [2023-09-01 06:54:24,714 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 381 places, 449 transitions, 928 flow [2023-09-01 06:54:24,714 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-09-01 06:54:24,714 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 381 places, 449 transitions, 928 flow [2023-09-01 06:54:24,714 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 381 places, 449 transitions, 928 flow [2023-09-01 06:54:24,715 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 381 places, 449 transitions, 928 flow [2023-09-01 06:54:24,830 INFO L130 PetriNetUnfolder]: 168/1019 cut-off events. [2023-09-01 06:54:24,831 INFO L131 PetriNetUnfolder]: For 19/19 co-relation queries the response was YES. [2023-09-01 06:54:24,848 INFO L83 FinitePrefix]: Finished finitePrefix Result has 1047 conditions, 1019 events. 168/1019 cut-off events. For 19/19 co-relation queries the response was YES. Maximal size of possible extension queue 24. Compared 5753 event pairs, 1 based on Foata normal form. 0/769 useless extension candidates. Maximal degree in co-relation 717. Up to 16 conditions per place. [2023-09-01 06:54:24,890 INFO L119 LiptonReduction]: Number of co-enabled transitions 121920 [2023-09-01 06:54:28,703 INFO L134 LiptonReduction]: Checked pairs total: 216688 [2023-09-01 06:54:28,703 INFO L136 LiptonReduction]: Total number of compositions: 369 [2023-09-01 06:54:28,705 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == InUseError ======== [2023-09-01 06:54:28,705 INFO L357 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=PETRI_NET, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mPorIndependenceSettings=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@41ce39b, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-09-01 06:54:28,707 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-09-01 06:54:28,725 INFO L130 PetriNetUnfolder]: 94/300 cut-off events. [2023-09-01 06:54:28,726 INFO L131 PetriNetUnfolder]: For 10/10 co-relation queries the response was YES. [2023-09-01 06:54:28,726 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-09-01 06:54:28,726 INFO L208 CegarLoopForPetriNet]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1] [2023-09-01 06:54:28,726 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-09-01 06:54:28,727 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-09-01 06:54:28,727 INFO L85 PathProgramCache]: Analyzing trace with hash 1463497936, now seen corresponding path program 1 times [2023-09-01 06:54:28,727 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-09-01 06:54:28,727 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1699262990] [2023-09-01 06:54:28,727 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-09-01 06:54:28,727 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-09-01 06:54:28,735 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-09-01 06:54:28,757 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2023-09-01 06:54:28,757 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-09-01 06:54:28,757 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1699262990] [2023-09-01 06:54:28,757 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1699262990] provided 1 perfect and 0 imperfect interpolant sequences [2023-09-01 06:54:28,757 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-09-01 06:54:28,757 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-09-01 06:54:28,758 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [397618424] [2023-09-01 06:54:28,758 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-09-01 06:54:28,758 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-09-01 06:54:28,758 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-09-01 06:54:28,758 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-09-01 06:54:28,759 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-09-01 06:54:28,766 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 374 out of 820 [2023-09-01 06:54:28,772 INFO L100 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 139 places, 198 transitions, 426 flow. Second operand has 3 states, 3 states have (on average 376.3333333333333) internal successors, (1129), 3 states have internal predecessors, (1129), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-09-01 06:54:28,773 INFO L109 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-09-01 06:54:28,773 INFO L110 encePairwiseOnDemand]: Number of universal subtrahend loopers: 374 of 820 [2023-09-01 06:54:28,773 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand