/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data -s ../../../trunk/examples/settings/automizer/concurrent/svcomp-Reach-32bit-Automizer_Default-noMmResRef-PN-NoLbe.epf --traceabstraction.use.on-demand.petri.net.difference true --traceabstraction.size.reduction.to.apply.after.petri.net.difference REMOVE_REDUNDANT_FLOW -tc ../../../trunk/examples/toolchains/AutomizerCInline.xml -i ../../../trunk/examples/svcomp/pthread/fib_safe-7.i -------------------------------------------------------------------------------- This is Ultimate 0.2.2-wip.dk.repeated-lipton-a802222-m [2022-12-12 11:25:16,611 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-12-12 11:25:16,613 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-12-12 11:25:16,652 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-12-12 11:25:16,653 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-12-12 11:25:16,655 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-12-12 11:25:16,658 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-12-12 11:25:16,662 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-12-12 11:25:16,666 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-12-12 11:25:16,670 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-12-12 11:25:16,671 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-12-12 11:25:16,673 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-12-12 11:25:16,673 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-12-12 11:25:16,675 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-12-12 11:25:16,676 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-12-12 11:25:16,679 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-12-12 11:25:16,680 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-12-12 11:25:16,680 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-12-12 11:25:16,683 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-12-12 11:25:16,687 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-12-12 11:25:16,688 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-12-12 11:25:16,689 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-12-12 11:25:16,690 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-12-12 11:25:16,691 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-12-12 11:25:16,697 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-12-12 11:25:16,697 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-12-12 11:25:16,698 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-12-12 11:25:16,699 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-12-12 11:25:16,699 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-12-12 11:25:16,700 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-12-12 11:25:16,700 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-12-12 11:25:16,702 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-12-12 11:25:16,702 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-12-12 11:25:16,703 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-12-12 11:25:16,704 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-12-12 11:25:16,704 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-12-12 11:25:16,704 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-12-12 11:25:16,705 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-12-12 11:25:16,705 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-12-12 11:25:16,705 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-12-12 11:25:16,706 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-12-12 11:25:16,707 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/concurrent/svcomp-Reach-32bit-Automizer_Default-noMmResRef-PN-NoLbe.epf [2022-12-12 11:25:16,736 INFO L113 SettingsManager]: Loading preferences was successful [2022-12-12 11:25:16,736 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-12-12 11:25:16,737 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-12-12 11:25:16,737 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-12-12 11:25:16,738 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2022-12-12 11:25:16,739 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2022-12-12 11:25:16,739 INFO L138 SettingsManager]: * Use SBE=true [2022-12-12 11:25:16,739 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-12-12 11:25:16,739 INFO L138 SettingsManager]: * sizeof long=4 [2022-12-12 11:25:16,739 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-12-12 11:25:16,740 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-12-12 11:25:16,740 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-12-12 11:25:16,740 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-12-12 11:25:16,741 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-12-12 11:25:16,741 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-12-12 11:25:16,741 INFO L138 SettingsManager]: * sizeof long double=12 [2022-12-12 11:25:16,741 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-12-12 11:25:16,741 INFO L138 SettingsManager]: * Use constant arrays=true [2022-12-12 11:25:16,741 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-12-12 11:25:16,741 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-12-12 11:25:16,742 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2022-12-12 11:25:16,742 INFO L138 SettingsManager]: * To the following directory=./dump/ [2022-12-12 11:25:16,742 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-12-12 11:25:16,742 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-12-12 11:25:16,742 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-12-12 11:25:16,742 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-12-12 11:25:16,742 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-12-12 11:25:16,743 INFO L138 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2022-12-12 11:25:16,743 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-12-12 11:25:16,743 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2022-12-12 11:25:16,743 INFO L138 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2022-12-12 11:25:16,743 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use on-demand Petri net difference -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Size reduction to apply after Petri net difference -> REMOVE_REDUNDANT_FLOW [2022-12-12 11:25:17,026 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-12-12 11:25:17,042 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-12-12 11:25:17,043 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-12-12 11:25:17,046 INFO L271 PluginConnector]: Initializing CDTParser... [2022-12-12 11:25:17,046 INFO L275 PluginConnector]: CDTParser initialized [2022-12-12 11:25:17,047 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/pthread/fib_safe-7.i [2022-12-12 11:25:18,097 INFO L500 CDTParser]: Created temporary CDT project at NULL [2022-12-12 11:25:18,363 INFO L351 CDTParser]: Found 1 translation units. [2022-12-12 11:25:18,366 INFO L172 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/pthread/fib_safe-7.i [2022-12-12 11:25:18,381 INFO L394 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/944b989a2/94cecf08063d4869b8c8c2b48c7dab4d/FLAGf929c4047 [2022-12-12 11:25:18,394 INFO L402 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/944b989a2/94cecf08063d4869b8c8c2b48c7dab4d [2022-12-12 11:25:18,396 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-12-12 11:25:18,397 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2022-12-12 11:25:18,398 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-12-12 11:25:18,398 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-12-12 11:25:18,401 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-12-12 11:25:18,401 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 12.12 11:25:18" (1/1) ... [2022-12-12 11:25:18,402 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@35827eb2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.12 11:25:18, skipping insertion in model container [2022-12-12 11:25:18,402 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 12.12 11:25:18" (1/1) ... [2022-12-12 11:25:18,408 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-12-12 11:25:18,439 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-12-12 11:25:18,675 WARN L237 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/pthread/fib_safe-7.i[30241,30254] [2022-12-12 11:25:18,685 WARN L623 FunctionHandler]: Unknown extern function __VERIFIER_atomic_begin [2022-12-12 11:25:18,686 WARN L623 FunctionHandler]: Unknown extern function __VERIFIER_atomic_end [2022-12-12 11:25:18,690 WARN L623 FunctionHandler]: Unknown extern function __VERIFIER_atomic_begin [2022-12-12 11:25:18,691 WARN L623 FunctionHandler]: Unknown extern function __VERIFIER_atomic_end [2022-12-12 11:25:18,695 WARN L623 FunctionHandler]: Unknown extern function __VERIFIER_atomic_begin [2022-12-12 11:25:18,696 WARN L623 FunctionHandler]: Unknown extern function __VERIFIER_atomic_end [2022-12-12 11:25:18,696 WARN L623 FunctionHandler]: Unknown extern function __VERIFIER_atomic_begin [2022-12-12 11:25:18,696 WARN L623 FunctionHandler]: Unknown extern function __VERIFIER_atomic_end [2022-12-12 11:25:18,699 WARN L623 FunctionHandler]: Unknown extern function __VERIFIER_atomic_begin [2022-12-12 11:25:18,700 WARN L623 FunctionHandler]: Unknown extern function __VERIFIER_atomic_end [2022-12-12 11:25:18,702 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-12-12 11:25:18,711 INFO L203 MainTranslator]: Completed pre-run [2022-12-12 11:25:18,756 WARN L237 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/pthread/fib_safe-7.i[30241,30254] [2022-12-12 11:25:18,757 WARN L623 FunctionHandler]: Unknown extern function __VERIFIER_atomic_begin [2022-12-12 11:25:18,758 WARN L623 FunctionHandler]: Unknown extern function __VERIFIER_atomic_end [2022-12-12 11:25:18,758 WARN L623 FunctionHandler]: Unknown extern function __VERIFIER_atomic_begin [2022-12-12 11:25:18,759 WARN L623 FunctionHandler]: Unknown extern function __VERIFIER_atomic_end [2022-12-12 11:25:18,765 WARN L623 FunctionHandler]: Unknown extern function __VERIFIER_atomic_begin [2022-12-12 11:25:18,765 WARN L623 FunctionHandler]: Unknown extern function __VERIFIER_atomic_end [2022-12-12 11:25:18,765 WARN L623 FunctionHandler]: Unknown extern function __VERIFIER_atomic_begin [2022-12-12 11:25:18,766 WARN L623 FunctionHandler]: Unknown extern function __VERIFIER_atomic_end [2022-12-12 11:25:18,768 WARN L623 FunctionHandler]: Unknown extern function __VERIFIER_atomic_begin [2022-12-12 11:25:18,769 WARN L623 FunctionHandler]: Unknown extern function __VERIFIER_atomic_end [2022-12-12 11:25:18,773 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-12-12 11:25:18,807 INFO L208 MainTranslator]: Completed translation [2022-12-12 11:25:18,808 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.12 11:25:18 WrapperNode [2022-12-12 11:25:18,808 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-12-12 11:25:18,809 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-12-12 11:25:18,810 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-12-12 11:25:18,811 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-12-12 11:25:18,817 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.12 11:25:18" (1/1) ... [2022-12-12 11:25:18,847 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.12 11:25:18" (1/1) ... [2022-12-12 11:25:18,872 INFO L138 Inliner]: procedures = 165, calls = 28, calls flagged for inlining = 4, calls inlined = 4, statements flattened = 76 [2022-12-12 11:25:18,873 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-12-12 11:25:18,874 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-12-12 11:25:18,875 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-12-12 11:25:18,875 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-12-12 11:25:18,882 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.12 11:25:18" (1/1) ... [2022-12-12 11:25:18,883 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.12 11:25:18" (1/1) ... [2022-12-12 11:25:18,888 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.12 11:25:18" (1/1) ... [2022-12-12 11:25:18,889 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.12 11:25:18" (1/1) ... [2022-12-12 11:25:18,904 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.12 11:25:18" (1/1) ... [2022-12-12 11:25:18,907 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.12 11:25:18" (1/1) ... [2022-12-12 11:25:18,908 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.12 11:25:18" (1/1) ... [2022-12-12 11:25:18,909 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.12 11:25:18" (1/1) ... [2022-12-12 11:25:18,917 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-12-12 11:25:18,918 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-12-12 11:25:18,918 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-12-12 11:25:18,919 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-12-12 11:25:18,919 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.12 11:25:18" (1/1) ... [2022-12-12 11:25:18,924 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-12-12 11:25:18,935 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-12-12 11:25:18,946 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) [2022-12-12 11:25:18,963 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 [2022-12-12 11:25:18,994 INFO L130 BoogieDeclarations]: Found specification of procedure t1 [2022-12-12 11:25:18,994 INFO L138 BoogieDeclarations]: Found implementation of procedure t1 [2022-12-12 11:25:18,994 INFO L130 BoogieDeclarations]: Found specification of procedure t2 [2022-12-12 11:25:18,994 INFO L138 BoogieDeclarations]: Found implementation of procedure t2 [2022-12-12 11:25:18,994 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-12-12 11:25:18,994 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_atomic_begin [2022-12-12 11:25:18,995 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-12-12 11:25:18,995 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2022-12-12 11:25:18,995 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-12-12 11:25:18,995 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-12-12 11:25:18,995 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_atomic_end [2022-12-12 11:25:18,995 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-12-12 11:25:18,995 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-12-12 11:25:18,997 WARN L210 CfgBuilder]: User set CodeBlockSize to SequenceOfStatements but program contains fork statements. Overwriting the user preferences and setting CodeBlockSize to OneNontrivialStatement [2022-12-12 11:25:19,121 INFO L236 CfgBuilder]: Building ICFG [2022-12-12 11:25:19,123 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2022-12-12 11:25:19,329 INFO L277 CfgBuilder]: Performing block encoding [2022-12-12 11:25:19,335 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-12-12 11:25:19,335 INFO L302 CfgBuilder]: Removed 3 assume(true) statements. [2022-12-12 11:25:19,337 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 12.12 11:25:19 BoogieIcfgContainer [2022-12-12 11:25:19,337 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-12-12 11:25:19,339 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-12-12 11:25:19,339 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-12-12 11:25:19,342 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-12-12 11:25:19,342 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 12.12 11:25:18" (1/3) ... [2022-12-12 11:25:19,343 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@72dc3855 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 12.12 11:25:19, skipping insertion in model container [2022-12-12 11:25:19,343 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.12 11:25:18" (2/3) ... [2022-12-12 11:25:19,343 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@72dc3855 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 12.12 11:25:19, skipping insertion in model container [2022-12-12 11:25:19,343 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 12.12 11:25:19" (3/3) ... [2022-12-12 11:25:19,344 INFO L112 eAbstractionObserver]: Analyzing ICFG fib_safe-7.i [2022-12-12 11:25:19,362 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-12-12 11:25:19,362 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-12-12 11:25:19,362 INFO L515 ceAbstractionStarter]: Constructing petrified ICFG for 1 thread instances. [2022-12-12 11:25:19,440 INFO L144 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2022-12-12 11:25:19,472 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 93 places, 93 transitions, 196 flow [2022-12-12 11:25:19,544 INFO L130 PetriNetUnfolder]: 7/91 cut-off events. [2022-12-12 11:25:19,545 INFO L131 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2022-12-12 11:25:19,550 INFO L83 FinitePrefix]: Finished finitePrefix Result has 98 conditions, 91 events. 7/91 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 3. Compared 74 event pairs, 0 based on Foata normal form. 0/83 useless extension candidates. Maximal degree in co-relation 65. Up to 2 conditions per place. [2022-12-12 11:25:19,551 INFO L82 GeneralOperation]: Start removeDead. Operand has 93 places, 93 transitions, 196 flow [2022-12-12 11:25:19,556 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 91 places, 91 transitions, 188 flow [2022-12-12 11:25:19,574 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-12-12 11:25:19,580 INFO L357 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=false, mAutomataTypeConcurrency=PETRI_NET, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mPorIndependenceSettings=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@717accc, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, Conditionality=CONDITIONAL_DISJUNCTIVE, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-12-12 11:25:19,581 INFO L358 AbstractCegarLoop]: Starting to check reachability of 3 error locations. [2022-12-12 11:25:19,618 INFO L130 PetriNetUnfolder]: 6/81 cut-off events. [2022-12-12 11:25:19,618 INFO L131 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2022-12-12 11:25:19,618 INFO L206 CegarLoopForPetriNet]: Found error trace [2022-12-12 11:25:19,619 INFO L214 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-12 11:25:19,620 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES, ULTIMATE.startErr1INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2022-12-12 11:25:19,625 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-12 11:25:19,626 INFO L85 PathProgramCache]: Analyzing trace with hash 95801150, now seen corresponding path program 1 times [2022-12-12 11:25:19,634 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-12-12 11:25:19,634 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1475600702] [2022-12-12 11:25:19,635 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-12 11:25:19,635 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-12 11:25:19,790 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-12 11:25:20,008 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-12 11:25:20,008 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-12-12 11:25:20,008 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1475600702] [2022-12-12 11:25:20,009 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1475600702] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-12 11:25:20,009 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-12 11:25:20,009 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-12-12 11:25:20,011 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [396468779] [2022-12-12 11:25:20,012 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-12 11:25:20,020 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-12-12 11:25:20,020 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-12-12 11:25:20,046 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-12-12 11:25:20,047 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-12-12 11:25:20,051 INFO L481 CegarLoopForPetriNet]: Number of universal loopers: 80 out of 93 [2022-12-12 11:25:20,053 INFO L100 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 91 places, 91 transitions, 188 flow. Second operand has 3 states, 3 states have (on average 81.66666666666667) internal successors, (245), 3 states have internal predecessors, (245), 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) [2022-12-12 11:25:20,054 INFO L109 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2022-12-12 11:25:20,054 INFO L110 encePairwiseOnDemand]: Number of universal subtrahend loopers: 80 of 93 [2022-12-12 11:25:20,054 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2022-12-12 11:25:20,126 INFO L130 PetriNetUnfolder]: 3/92 cut-off events. [2022-12-12 11:25:20,127 INFO L131 PetriNetUnfolder]: For 2/2 co-relation queries the response was YES. [2022-12-12 11:25:20,128 INFO L83 FinitePrefix]: Finished finitePrefix Result has 111 conditions, 92 events. 3/92 cut-off events. For 2/2 co-relation queries the response was YES. Maximal size of possible extension queue 3. Compared 63 event pairs, 0 based on Foata normal form. 18/106 useless extension candidates. Maximal degree in co-relation 75. Up to 6 conditions per place. [2022-12-12 11:25:20,131 INFO L137 encePairwiseOnDemand]: 86/93 looper letters, 9 selfloop transitions, 2 changer transitions 0/89 dead transitions. [2022-12-12 11:25:20,131 INFO L142 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 92 places, 89 transitions, 206 flow [2022-12-12 11:25:20,133 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-12-12 11:25:20,135 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2022-12-12 11:25:20,143 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 259 transitions. [2022-12-12 11:25:20,148 INFO L526 CegarLoopForPetriNet]: DFA transition density 0.9283154121863799 [2022-12-12 11:25:20,153 INFO L295 CegarLoopForPetriNet]: 91 programPoint places, 1 predicate places. [2022-12-12 11:25:20,155 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 92 places, 89 transitions, 206 flow [2022-12-12 11:25:20,158 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 90 places, 89 transitions, 198 flow, removed 3 selfloop flow, removed 2 redundant places. [2022-12-12 11:25:20,159 INFO L495 AbstractCegarLoop]: Abstraction has has 90 places, 89 transitions, 198 flow [2022-12-12 11:25:20,160 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 81.66666666666667) internal successors, (245), 3 states have internal predecessors, (245), 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) [2022-12-12 11:25:20,160 INFO L206 CegarLoopForPetriNet]: Found error trace [2022-12-12 11:25:20,161 INFO L214 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-12 11:25:20,161 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-12-12 11:25:20,162 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES, ULTIMATE.startErr1INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2022-12-12 11:25:20,163 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-12 11:25:20,163 INFO L85 PathProgramCache]: Analyzing trace with hash 1875915451, now seen corresponding path program 1 times [2022-12-12 11:25:20,163 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-12-12 11:25:20,163 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1509079406] [2022-12-12 11:25:20,163 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-12 11:25:20,163 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-12 11:25:20,215 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-12 11:25:20,395 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-12 11:25:20,395 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-12-12 11:25:20,395 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1509079406] [2022-12-12 11:25:20,396 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1509079406] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-12 11:25:20,396 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1647661689] [2022-12-12 11:25:20,396 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-12 11:25:20,396 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-12 11:25:20,397 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-12-12 11:25:20,399 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) [2022-12-12 11:25:20,400 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-12-12 11:25:20,573 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-12 11:25:20,575 INFO L263 TraceCheckSpWp]: Trace formula consists of 153 conjuncts, 4 conjunts are in the unsatisfiable core [2022-12-12 11:25:20,584 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-12 11:25:20,671 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-12 11:25:20,671 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-12 11:25:20,738 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-12 11:25:20,739 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1647661689] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-12 11:25:20,739 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-12 11:25:20,739 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 10 [2022-12-12 11:25:20,740 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [362741095] [2022-12-12 11:25:20,740 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-12 11:25:20,741 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-12-12 11:25:20,741 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-12-12 11:25:20,741 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-12-12 11:25:20,741 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=60, Unknown=0, NotChecked=0, Total=90 [2022-12-12 11:25:20,743 INFO L481 CegarLoopForPetriNet]: Number of universal loopers: 78 out of 93 [2022-12-12 11:25:20,745 INFO L100 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 90 places, 89 transitions, 198 flow. Second operand has 10 states, 10 states have (on average 80.0) internal successors, (800), 10 states have internal predecessors, (800), 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) [2022-12-12 11:25:20,745 INFO L109 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2022-12-12 11:25:20,745 INFO L110 encePairwiseOnDemand]: Number of universal subtrahend loopers: 78 of 93 [2022-12-12 11:25:20,745 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2022-12-12 11:25:20,834 INFO L130 PetriNetUnfolder]: 3/101 cut-off events. [2022-12-12 11:25:20,834 INFO L131 PetriNetUnfolder]: For 4/4 co-relation queries the response was YES. [2022-12-12 11:25:20,839 INFO L83 FinitePrefix]: Finished finitePrefix Result has 139 conditions, 101 events. 3/101 cut-off events. For 4/4 co-relation queries the response was YES. Maximal size of possible extension queue 3. Compared 55 event pairs, 0 based on Foata normal form. 0/97 useless extension candidates. Maximal degree in co-relation 103. Up to 10 conditions per place. [2022-12-12 11:25:20,840 INFO L137 encePairwiseOnDemand]: 87/93 looper letters, 10 selfloop transitions, 9 changer transitions 0/95 dead transitions. [2022-12-12 11:25:20,841 INFO L142 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 98 places, 95 transitions, 256 flow [2022-12-12 11:25:20,841 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-12-12 11:25:20,841 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 9 states. [2022-12-12 11:25:20,845 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9 states to 9 states and 723 transitions. [2022-12-12 11:25:20,846 INFO L526 CegarLoopForPetriNet]: DFA transition density 0.8637992831541219 [2022-12-12 11:25:20,847 INFO L295 CegarLoopForPetriNet]: 91 programPoint places, 7 predicate places. [2022-12-12 11:25:20,847 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 98 places, 95 transitions, 256 flow [2022-12-12 11:25:20,850 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 96 places, 95 transitions, 224 flow, removed 14 selfloop flow, removed 2 redundant places. [2022-12-12 11:25:20,850 INFO L495 AbstractCegarLoop]: Abstraction has has 96 places, 95 transitions, 224 flow [2022-12-12 11:25:20,851 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 80.0) internal successors, (800), 10 states have internal predecessors, (800), 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) [2022-12-12 11:25:20,851 INFO L206 CegarLoopForPetriNet]: Found error trace [2022-12-12 11:25:20,852 INFO L214 CegarLoopForPetriNet]: trace histogram [3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-12 11:25:20,860 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-12-12 11:25:21,057 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 [2022-12-12 11:25:21,058 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES, ULTIMATE.startErr1INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2022-12-12 11:25:21,058 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-12 11:25:21,058 INFO L85 PathProgramCache]: Analyzing trace with hash -1869128357, now seen corresponding path program 2 times [2022-12-12 11:25:21,059 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-12-12 11:25:21,059 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1299421279] [2022-12-12 11:25:21,059 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-12 11:25:21,059 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-12 11:25:21,080 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-12 11:25:21,287 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-12 11:25:21,287 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-12-12 11:25:21,288 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1299421279] [2022-12-12 11:25:21,288 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1299421279] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-12 11:25:21,288 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [67057453] [2022-12-12 11:25:21,288 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-12-12 11:25:21,288 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-12 11:25:21,289 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-12-12 11:25:21,292 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) [2022-12-12 11:25:21,298 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-12-12 11:25:21,404 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-12-12 11:25:21,404 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-12 11:25:21,405 INFO L263 TraceCheckSpWp]: Trace formula consists of 177 conjuncts, 8 conjunts are in the unsatisfiable core [2022-12-12 11:25:21,409 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-12 11:25:21,483 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-12 11:25:21,483 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-12 11:25:21,594 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-12 11:25:21,595 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [67057453] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-12 11:25:21,595 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-12 11:25:21,595 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 18 [2022-12-12 11:25:21,595 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [453816770] [2022-12-12 11:25:21,595 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-12 11:25:21,596 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2022-12-12 11:25:21,596 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-12-12 11:25:21,597 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2022-12-12 11:25:21,597 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=216, Unknown=0, NotChecked=0, Total=306 [2022-12-12 11:25:21,599 INFO L481 CegarLoopForPetriNet]: Number of universal loopers: 78 out of 93 [2022-12-12 11:25:21,601 INFO L100 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 96 places, 95 transitions, 224 flow. Second operand has 18 states, 18 states have (on average 80.0) internal successors, (1440), 18 states have internal predecessors, (1440), 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) [2022-12-12 11:25:21,601 INFO L109 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2022-12-12 11:25:21,601 INFO L110 encePairwiseOnDemand]: Number of universal subtrahend loopers: 78 of 93 [2022-12-12 11:25:21,601 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2022-12-12 11:25:21,788 INFO L130 PetriNetUnfolder]: 3/129 cut-off events. [2022-12-12 11:25:21,788 INFO L131 PetriNetUnfolder]: For 8/8 co-relation queries the response was YES. [2022-12-12 11:25:21,789 INFO L83 FinitePrefix]: Finished finitePrefix Result has 202 conditions, 129 events. 3/129 cut-off events. For 8/8 co-relation queries the response was YES. Maximal size of possible extension queue 3. Compared 55 event pairs, 0 based on Foata normal form. 0/125 useless extension candidates. Maximal degree in co-relation 166. Up to 12 conditions per place. [2022-12-12 11:25:21,789 INFO L137 encePairwiseOnDemand]: 87/93 looper letters, 14 selfloop transitions, 21 changer transitions 0/111 dead transitions. [2022-12-12 11:25:21,790 INFO L142 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 116 places, 111 transitions, 358 flow [2022-12-12 11:25:21,790 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2022-12-12 11:25:21,790 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2022-12-12 11:25:21,793 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 1677 transitions. [2022-12-12 11:25:21,794 INFO L526 CegarLoopForPetriNet]: DFA transition density 0.858678955453149 [2022-12-12 11:25:21,794 INFO L295 CegarLoopForPetriNet]: 91 programPoint places, 25 predicate places. [2022-12-12 11:25:21,795 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 116 places, 111 transitions, 358 flow [2022-12-12 11:25:21,797 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 110 places, 111 transitions, 318 flow, removed 14 selfloop flow, removed 6 redundant places. [2022-12-12 11:25:21,797 INFO L495 AbstractCegarLoop]: Abstraction has has 110 places, 111 transitions, 318 flow [2022-12-12 11:25:21,798 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 80.0) internal successors, (1440), 18 states have internal predecessors, (1440), 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) [2022-12-12 11:25:21,798 INFO L206 CegarLoopForPetriNet]: Found error trace [2022-12-12 11:25:21,798 INFO L214 CegarLoopForPetriNet]: trace histogram [7, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-12 11:25:21,806 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2022-12-12 11:25:22,003 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 [2022-12-12 11:25:22,004 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES, ULTIMATE.startErr1INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2022-12-12 11:25:22,004 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-12 11:25:22,004 INFO L85 PathProgramCache]: Analyzing trace with hash 526543515, now seen corresponding path program 3 times [2022-12-12 11:25:22,004 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-12-12 11:25:22,004 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [491300822] [2022-12-12 11:25:22,004 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-12 11:25:22,005 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-12 11:25:22,034 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-12 11:25:22,361 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 154 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-12 11:25:22,362 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-12-12 11:25:22,362 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [491300822] [2022-12-12 11:25:22,362 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [491300822] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-12 11:25:22,362 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1728526924] [2022-12-12 11:25:22,362 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-12 11:25:22,363 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-12 11:25:22,363 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-12-12 11:25:22,364 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) [2022-12-12 11:25:22,367 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-12-12 11:25:22,455 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2022-12-12 11:25:22,455 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-12 11:25:22,456 INFO L263 TraceCheckSpWp]: Trace formula consists of 225 conjuncts, 16 conjunts are in the unsatisfiable core [2022-12-12 11:25:22,462 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-12 11:25:22,564 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 154 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-12 11:25:22,564 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-12 11:25:22,883 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 154 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-12 11:25:22,884 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1728526924] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-12 11:25:22,884 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-12 11:25:22,884 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 34 [2022-12-12 11:25:22,885 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1298869877] [2022-12-12 11:25:22,885 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-12 11:25:22,889 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2022-12-12 11:25:22,889 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-12-12 11:25:22,891 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2022-12-12 11:25:22,892 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=306, Invalid=816, Unknown=0, NotChecked=0, Total=1122 [2022-12-12 11:25:22,895 INFO L481 CegarLoopForPetriNet]: Number of universal loopers: 78 out of 93 [2022-12-12 11:25:22,898 INFO L100 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 110 places, 111 transitions, 318 flow. Second operand has 34 states, 34 states have (on average 80.0) internal successors, (2720), 34 states have internal predecessors, (2720), 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) [2022-12-12 11:25:22,898 INFO L109 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2022-12-12 11:25:22,899 INFO L110 encePairwiseOnDemand]: Number of universal subtrahend loopers: 78 of 93 [2022-12-12 11:25:22,899 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2022-12-12 11:25:23,427 INFO L130 PetriNetUnfolder]: 3/185 cut-off events. [2022-12-12 11:25:23,428 INFO L131 PetriNetUnfolder]: For 42/42 co-relation queries the response was YES. [2022-12-12 11:25:23,429 INFO L83 FinitePrefix]: Finished finitePrefix Result has 362 conditions, 185 events. 3/185 cut-off events. For 42/42 co-relation queries the response was YES. Maximal size of possible extension queue 3. Compared 55 event pairs, 0 based on Foata normal form. 8/190 useless extension candidates. Maximal degree in co-relation 325. Up to 26 conditions per place. [2022-12-12 11:25:23,431 INFO L137 encePairwiseOnDemand]: 87/93 looper letters, 22 selfloop transitions, 45 changer transitions 0/143 dead transitions. [2022-12-12 11:25:23,431 INFO L142 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 154 places, 143 transitions, 628 flow [2022-12-12 11:25:23,432 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2022-12-12 11:25:23,432 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2022-12-12 11:25:23,437 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 3585 transitions. [2022-12-12 11:25:23,440 INFO L526 CegarLoopForPetriNet]: DFA transition density 0.8566308243727598 [2022-12-12 11:25:23,441 INFO L295 CegarLoopForPetriNet]: 91 programPoint places, 63 predicate places. [2022-12-12 11:25:23,441 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 154 places, 143 transitions, 628 flow [2022-12-12 11:25:23,448 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 136 places, 143 transitions, 548 flow, removed 22 selfloop flow, removed 18 redundant places. [2022-12-12 11:25:23,448 INFO L495 AbstractCegarLoop]: Abstraction has has 136 places, 143 transitions, 548 flow [2022-12-12 11:25:23,450 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 80.0) internal successors, (2720), 34 states have internal predecessors, (2720), 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) [2022-12-12 11:25:23,450 INFO L206 CegarLoopForPetriNet]: Found error trace [2022-12-12 11:25:23,450 INFO L214 CegarLoopForPetriNet]: trace histogram [15, 15, 15, 15, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-12 11:25:23,458 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-12-12 11:25:23,658 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-12 11:25:23,658 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES, ULTIMATE.startErr1INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2022-12-12 11:25:23,659 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-12 11:25:23,659 INFO L85 PathProgramCache]: Analyzing trace with hash -578591461, now seen corresponding path program 4 times [2022-12-12 11:25:23,659 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-12-12 11:25:23,659 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1470876898] [2022-12-12 11:25:23,659 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-12 11:25:23,660 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-12 11:25:23,736 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-12 11:25:24,482 INFO L134 CoverageAnalysis]: Checked inductivity of 750 backedges. 0 proven. 750 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-12 11:25:24,483 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-12-12 11:25:24,483 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1470876898] [2022-12-12 11:25:24,483 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1470876898] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-12 11:25:24,483 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [642060660] [2022-12-12 11:25:24,483 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-12 11:25:24,483 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-12 11:25:24,484 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-12-12 11:25:24,488 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) [2022-12-12 11:25:24,517 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-12-12 11:25:24,597 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-12 11:25:24,598 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-12 11:25:24,599 INFO L263 TraceCheckSpWp]: Trace formula consists of 321 conjuncts, 32 conjunts are in the unsatisfiable core [2022-12-12 11:25:24,613 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-12 11:25:24,780 INFO L134 CoverageAnalysis]: Checked inductivity of 750 backedges. 0 proven. 750 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-12 11:25:24,781 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-12 11:25:25,229 INFO L134 CoverageAnalysis]: Checked inductivity of 750 backedges. 0 proven. 750 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-12 11:25:25,229 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [642060660] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-12 11:25:25,229 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-12 11:25:25,229 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 33, 33] total 35 [2022-12-12 11:25:25,230 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1011366662] [2022-12-12 11:25:25,230 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-12 11:25:25,230 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2022-12-12 11:25:25,230 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-12-12 11:25:25,231 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2022-12-12 11:25:25,231 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=323, Invalid=867, Unknown=0, NotChecked=0, Total=1190 [2022-12-12 11:25:25,233 INFO L481 CegarLoopForPetriNet]: Number of universal loopers: 78 out of 93 [2022-12-12 11:25:25,254 INFO L100 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 136 places, 143 transitions, 548 flow. Second operand has 35 states, 35 states have (on average 80.0) internal successors, (2800), 35 states have internal predecessors, (2800), 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) [2022-12-12 11:25:25,254 INFO L109 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2022-12-12 11:25:25,254 INFO L110 encePairwiseOnDemand]: Number of universal subtrahend loopers: 78 of 93 [2022-12-12 11:25:25,255 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2022-12-12 11:25:25,822 INFO L130 PetriNetUnfolder]: 3/192 cut-off events. [2022-12-12 11:25:25,822 INFO L131 PetriNetUnfolder]: For 85/85 co-relation queries the response was YES. [2022-12-12 11:25:25,823 INFO L83 FinitePrefix]: Finished finitePrefix Result has 411 conditions, 192 events. 3/192 cut-off events. For 85/85 co-relation queries the response was YES. Maximal size of possible extension queue 3. Compared 55 event pairs, 0 based on Foata normal form. 1/190 useless extension candidates. Maximal degree in co-relation 373. Up to 28 conditions per place. [2022-12-12 11:25:25,824 INFO L137 encePairwiseOnDemand]: 87/93 looper letters, 23 selfloop transitions, 48 changer transitions 0/147 dead transitions. [2022-12-12 11:25:25,824 INFO L142 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 183 places, 147 transitions, 718 flow [2022-12-12 11:25:25,825 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2022-12-12 11:25:25,825 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2022-12-12 11:25:25,830 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 3816 transitions. [2022-12-12 11:25:25,832 INFO L526 CegarLoopForPetriNet]: DFA transition density 0.8548387096774194 [2022-12-12 11:25:25,834 INFO L295 CegarLoopForPetriNet]: 91 programPoint places, 92 predicate places. [2022-12-12 11:25:25,834 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 183 places, 147 transitions, 718 flow [2022-12-12 11:25:25,837 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 141 places, 147 transitions, 588 flow, removed 23 selfloop flow, removed 42 redundant places. [2022-12-12 11:25:25,837 INFO L495 AbstractCegarLoop]: Abstraction has has 141 places, 147 transitions, 588 flow [2022-12-12 11:25:25,838 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 80.0) internal successors, (2800), 35 states have internal predecessors, (2800), 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) [2022-12-12 11:25:25,839 INFO L206 CegarLoopForPetriNet]: Found error trace [2022-12-12 11:25:25,839 INFO L214 CegarLoopForPetriNet]: trace histogram [16, 16, 16, 16, 16, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-12 11:25:25,845 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-12-12 11:25:26,044 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-12 11:25:26,045 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES, ULTIMATE.startErr1INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2022-12-12 11:25:26,045 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-12 11:25:26,045 INFO L85 PathProgramCache]: Analyzing trace with hash 1675934270, now seen corresponding path program 5 times [2022-12-12 11:25:26,045 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-12-12 11:25:26,046 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [305348587] [2022-12-12 11:25:26,046 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-12 11:25:26,046 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-12 11:25:26,098 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-12 11:25:28,820 INFO L134 CoverageAnalysis]: Checked inductivity of 856 backedges. 0 proven. 856 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-12 11:25:28,820 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-12-12 11:25:28,820 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [305348587] [2022-12-12 11:25:28,820 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [305348587] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-12 11:25:28,820 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [694974589] [2022-12-12 11:25:28,821 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2022-12-12 11:25:28,821 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-12 11:25:28,821 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-12-12 11:25:28,828 INFO L229 MonitoredProcess]: Starting monitored process 6 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-12 11:25:28,831 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-12-12 11:25:28,927 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 17 check-sat command(s) [2022-12-12 11:25:28,927 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-12 11:25:28,929 INFO L263 TraceCheckSpWp]: Trace formula consists of 333 conjuncts, 57 conjunts are in the unsatisfiable core [2022-12-12 11:25:28,934 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-12 11:25:33,332 INFO L134 CoverageAnalysis]: Checked inductivity of 856 backedges. 665 proven. 191 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-12 11:25:33,333 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-12 11:25:38,381 INFO L134 CoverageAnalysis]: Checked inductivity of 856 backedges. 0 proven. 856 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-12 11:25:38,382 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [694974589] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-12 11:25:38,382 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-12 11:25:38,382 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [57, 57, 57] total 163 [2022-12-12 11:25:38,382 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [669880885] [2022-12-12 11:25:38,382 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-12 11:25:38,383 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 163 states [2022-12-12 11:25:38,383 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-12-12 11:25:38,384 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 163 interpolants. [2022-12-12 11:25:38,390 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1567, Invalid=24839, Unknown=0, NotChecked=0, Total=26406 [2022-12-12 11:25:38,397 INFO L481 CegarLoopForPetriNet]: Number of universal loopers: 61 out of 93 [2022-12-12 11:25:38,406 INFO L100 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 141 places, 147 transitions, 588 flow. Second operand has 163 states, 163 states have (on average 62.214723926380366) internal successors, (10141), 163 states have internal predecessors, (10141), 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) [2022-12-12 11:25:38,406 INFO L109 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2022-12-12 11:25:38,406 INFO L110 encePairwiseOnDemand]: Number of universal subtrahend loopers: 61 of 93 [2022-12-12 11:25:38,406 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2022-12-12 11:31:04,837 INFO L130 PetriNetUnfolder]: 51434/202986 cut-off events. [2022-12-12 11:31:04,838 INFO L131 PetriNetUnfolder]: For 6779/6779 co-relation queries the response was YES. [2022-12-12 11:31:05,527 INFO L83 FinitePrefix]: Finished finitePrefix Result has 297647 conditions, 202986 events. 51434/202986 cut-off events. For 6779/6779 co-relation queries the response was YES. Maximal size of possible extension queue 2656. Compared 3145201 event pairs, 0 based on Foata normal form. 0/185840 useless extension candidates. Maximal degree in co-relation 297601. Up to 25960 conditions per place. [2022-12-12 11:31:06,138 INFO L137 encePairwiseOnDemand]: 76/93 looper letters, 1859 selfloop transitions, 2773 changer transitions 1501/6246 dead transitions. [2022-12-12 11:31:06,140 INFO L142 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 1416 places, 6246 transitions, 25054 flow [2022-12-12 11:31:06,141 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 1276 states. [2022-12-12 11:31:06,141 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1276 states. [2022-12-12 11:31:06,205 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1276 states to 1276 states and 84092 transitions. [2022-12-12 11:31:06,245 INFO L526 CegarLoopForPetriNet]: DFA transition density 0.7086324872754238 [2022-12-12 11:31:06,248 INFO L295 CegarLoopForPetriNet]: 91 programPoint places, 1325 predicate places. [2022-12-12 11:31:06,249 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 1416 places, 6246 transitions, 25054 flow [2022-12-12 11:31:06,406 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 1415 places, 6246 transitions, 25042 flow, removed 5 selfloop flow, removed 1 redundant places. [2022-12-12 11:31:06,406 INFO L495 AbstractCegarLoop]: Abstraction has has 1415 places, 6246 transitions, 25042 flow [2022-12-12 11:31:06,411 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 163 states, 163 states have (on average 62.214723926380366) internal successors, (10141), 163 states have internal predecessors, (10141), 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) [2022-12-12 11:31:06,411 INFO L206 CegarLoopForPetriNet]: Found error trace [2022-12-12 11:31:06,411 INFO L214 CegarLoopForPetriNet]: trace histogram [16, 16, 16, 16, 16, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-12 11:31:06,417 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-12-12 11:31:06,617 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-12 11:31:06,617 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES, ULTIMATE.startErr1INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2022-12-12 11:31:06,618 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-12 11:31:06,618 INFO L85 PathProgramCache]: Analyzing trace with hash -1298344714, now seen corresponding path program 1 times [2022-12-12 11:31:06,618 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-12-12 11:31:06,619 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1491806537] [2022-12-12 11:31:06,619 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-12 11:31:06,619 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-12 11:31:06,929 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-12 11:31:09,439 INFO L134 CoverageAnalysis]: Checked inductivity of 856 backedges. 0 proven. 856 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-12 11:31:09,440 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-12-12 11:31:09,440 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1491806537] [2022-12-12 11:31:09,440 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1491806537] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-12 11:31:09,440 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1623300022] [2022-12-12 11:31:09,440 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-12 11:31:09,440 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-12 11:31:09,440 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-12-12 11:31:09,442 INFO L229 MonitoredProcess]: Starting monitored process 7 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-12 11:31:09,443 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-12-12 11:31:09,524 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-12 11:31:09,526 INFO L263 TraceCheckSpWp]: Trace formula consists of 351 conjuncts, 62 conjunts are in the unsatisfiable core [2022-12-12 11:31:09,529 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-12 11:31:13,806 INFO L134 CoverageAnalysis]: Checked inductivity of 856 backedges. 651 proven. 205 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-12 11:31:13,806 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-12 11:31:18,776 INFO L134 CoverageAnalysis]: Checked inductivity of 856 backedges. 0 proven. 856 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-12 11:31:18,777 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1623300022] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-12 11:31:18,777 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-12 11:31:18,777 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [59, 59, 59] total 171 [2022-12-12 11:31:18,777 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1091395747] [2022-12-12 11:31:18,777 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-12 11:31:18,778 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 171 states [2022-12-12 11:31:18,778 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-12-12 11:31:18,779 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 171 interpolants. [2022-12-12 11:31:18,786 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1588, Invalid=27482, Unknown=0, NotChecked=0, Total=29070 [2022-12-12 11:31:18,792 INFO L481 CegarLoopForPetriNet]: Number of universal loopers: 61 out of 93 [2022-12-12 11:31:18,800 INFO L100 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 1415 places, 6246 transitions, 25042 flow. Second operand has 171 states, 171 states have (on average 62.21052631578947) internal successors, (10638), 171 states have internal predecessors, (10638), 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) [2022-12-12 11:31:18,800 INFO L109 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2022-12-12 11:31:18,800 INFO L110 encePairwiseOnDemand]: Number of universal subtrahend loopers: 61 of 93 [2022-12-12 11:31:18,800 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand