./Ultimate.py --spec ../sv-benchmarks/c/properties/unreach-call.prp --file ../sv-benchmarks/c/weaver/popl20-figure1.wvr.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version ff03de63 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 ../sv-benchmarks/c/weaver/popl20-figure1.wvr.c -s /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Automizer --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 33cf58268090640beca4b79cf718f2ee2d6c29dee3e4b3e200f8bf0a7c295123 --- Real Ultimate output --- This is Ultimate 0.2.2-dev-ff03de6 [2021-12-21 15:20:27,600 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-12-21 15:20:27,602 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-12-21 15:20:27,668 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-12-21 15:20:27,669 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-12-21 15:20:27,672 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-12-21 15:20:27,673 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-12-21 15:20:27,676 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-12-21 15:20:27,678 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-12-21 15:20:27,682 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-12-21 15:20:27,683 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-12-21 15:20:27,684 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-12-21 15:20:27,684 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-12-21 15:20:27,686 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-12-21 15:20:27,688 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-12-21 15:20:27,691 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-12-21 15:20:27,692 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-12-21 15:20:27,693 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-12-21 15:20:27,695 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-12-21 15:20:27,699 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-12-21 15:20:27,700 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-12-21 15:20:27,701 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-12-21 15:20:27,702 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-12-21 15:20:27,703 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-12-21 15:20:27,709 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-12-21 15:20:27,710 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-12-21 15:20:27,710 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-12-21 15:20:27,711 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-12-21 15:20:27,712 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-12-21 15:20:27,713 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-12-21 15:20:27,713 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-12-21 15:20:27,714 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-12-21 15:20:27,715 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-12-21 15:20:27,716 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-12-21 15:20:27,717 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-12-21 15:20:27,717 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-12-21 15:20:27,718 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-12-21 15:20:27,718 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-12-21 15:20:27,718 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-12-21 15:20:27,719 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-12-21 15:20:27,720 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-12-21 15:20:27,721 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Default.epf [2021-12-21 15:20:27,753 INFO L113 SettingsManager]: Loading preferences was successful [2021-12-21 15:20:27,754 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-12-21 15:20:27,754 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-12-21 15:20:27,754 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-12-21 15:20:27,755 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-12-21 15:20:27,756 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-12-21 15:20:27,756 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-12-21 15:20:27,756 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-12-21 15:20:27,757 INFO L138 SettingsManager]: * Use SBE=true [2021-12-21 15:20:27,757 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-12-21 15:20:27,758 INFO L138 SettingsManager]: * sizeof long=4 [2021-12-21 15:20:27,758 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-12-21 15:20:27,758 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-12-21 15:20:27,758 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-12-21 15:20:27,758 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-12-21 15:20:27,758 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-12-21 15:20:27,759 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-12-21 15:20:27,759 INFO L138 SettingsManager]: * sizeof long double=12 [2021-12-21 15:20:27,759 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-12-21 15:20:27,759 INFO L138 SettingsManager]: * Use constant arrays=true [2021-12-21 15:20:27,759 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-12-21 15:20:27,760 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-12-21 15:20:27,760 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-12-21 15:20:27,760 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-12-21 15:20:27,760 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-12-21 15:20:27,760 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-12-21 15:20:27,761 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-12-21 15:20:27,761 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-12-21 15:20:27,761 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-12-21 15:20:27,761 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-12-21 15:20:27,761 INFO L138 SettingsManager]: * Large block encoding in concurrent analysis=OFF [2021-12-21 15:20:27,762 INFO L138 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2021-12-21 15:20:27,762 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-12-21 15:20:27,762 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-12-21 15:20:27,762 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 33cf58268090640beca4b79cf718f2ee2d6c29dee3e4b3e200f8bf0a7c295123 [2021-12-21 15:20:28,018 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-12-21 15:20:28,046 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-12-21 15:20:28,049 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-12-21 15:20:28,050 INFO L271 PluginConnector]: Initializing CDTParser... [2021-12-21 15:20:28,051 INFO L275 PluginConnector]: CDTParser initialized [2021-12-21 15:20:28,052 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/weaver/popl20-figure1.wvr.c [2021-12-21 15:20:28,107 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/af219cc68/864f9ac74a8c4baa8cf2c76ecf0d7f19/FLAG1f880edd9 [2021-12-21 15:20:28,489 INFO L306 CDTParser]: Found 1 translation units. [2021-12-21 15:20:28,489 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/weaver/popl20-figure1.wvr.c [2021-12-21 15:20:28,495 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/af219cc68/864f9ac74a8c4baa8cf2c76ecf0d7f19/FLAG1f880edd9 [2021-12-21 15:20:28,899 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/af219cc68/864f9ac74a8c4baa8cf2c76ecf0d7f19 [2021-12-21 15:20:28,901 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-12-21 15:20:28,902 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-12-21 15:20:28,904 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-12-21 15:20:28,904 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-12-21 15:20:28,907 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-12-21 15:20:28,907 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.12 03:20:28" (1/1) ... [2021-12-21 15:20:28,908 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@162dfffe and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 03:20:28, skipping insertion in model container [2021-12-21 15:20:28,909 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.12 03:20:28" (1/1) ... [2021-12-21 15:20:28,914 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-12-21 15:20:28,929 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-12-21 15:20:29,097 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/weaver/popl20-figure1.wvr.c[1991,2004] [2021-12-21 15:20:29,101 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-12-21 15:20:29,109 INFO L203 MainTranslator]: Completed pre-run [2021-12-21 15:20:29,139 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/weaver/popl20-figure1.wvr.c[1991,2004] [2021-12-21 15:20:29,147 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-12-21 15:20:29,161 INFO L208 MainTranslator]: Completed translation [2021-12-21 15:20:29,161 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 03:20:29 WrapperNode [2021-12-21 15:20:29,162 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-12-21 15:20:29,163 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-12-21 15:20:29,163 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-12-21 15:20:29,164 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-12-21 15:20:29,170 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 03:20:29" (1/1) ... [2021-12-21 15:20:29,178 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 03:20:29" (1/1) ... [2021-12-21 15:20:29,202 INFO L137 Inliner]: procedures = 21, calls = 24, calls flagged for inlining = 4, calls inlined = 4, statements flattened = 68 [2021-12-21 15:20:29,202 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-12-21 15:20:29,203 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-12-21 15:20:29,203 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-12-21 15:20:29,203 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-12-21 15:20:29,210 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 03:20:29" (1/1) ... [2021-12-21 15:20:29,211 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 03:20:29" (1/1) ... [2021-12-21 15:20:29,223 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 03:20:29" (1/1) ... [2021-12-21 15:20:29,224 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 03:20:29" (1/1) ... [2021-12-21 15:20:29,232 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 03:20:29" (1/1) ... [2021-12-21 15:20:29,242 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 03:20:29" (1/1) ... [2021-12-21 15:20:29,244 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 03:20:29" (1/1) ... [2021-12-21 15:20:29,250 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-12-21 15:20:29,251 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-12-21 15:20:29,252 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-12-21 15:20:29,252 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-12-21 15:20:29,254 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 03:20:29" (1/1) ... [2021-12-21 15:20:29,261 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-12-21 15:20:29,273 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 15:20:29,293 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) [2021-12-21 15:20:29,314 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 [2021-12-21 15:20:29,337 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-12-21 15:20:29,337 INFO L130 BoogieDeclarations]: Found specification of procedure thread1 [2021-12-21 15:20:29,337 INFO L138 BoogieDeclarations]: Found implementation of procedure thread1 [2021-12-21 15:20:29,337 INFO L130 BoogieDeclarations]: Found specification of procedure thread2 [2021-12-21 15:20:29,338 INFO L138 BoogieDeclarations]: Found implementation of procedure thread2 [2021-12-21 15:20:29,338 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-12-21 15:20:29,338 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-12-21 15:20:29,338 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-12-21 15:20:29,338 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_atomic_end [2021-12-21 15:20:29,339 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_atomic_begin [2021-12-21 15:20:29,339 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-12-21 15:20:29,339 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-12-21 15:20:29,339 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-12-21 15:20:29,340 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-12-21 15:20:29,341 WARN L208 CfgBuilder]: User set CodeBlockSize to SequenceOfStatements but program contains fork statements. Overwriting the user preferences and setting CodeBlockSize to SingleStatement [2021-12-21 15:20:29,407 INFO L234 CfgBuilder]: Building ICFG [2021-12-21 15:20:29,408 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2021-12-21 15:20:29,528 INFO L275 CfgBuilder]: Performing block encoding [2021-12-21 15:20:29,563 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-12-21 15:20:29,563 INFO L299 CfgBuilder]: Removed 2 assume(true) statements. [2021-12-21 15:20:29,565 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.12 03:20:29 BoogieIcfgContainer [2021-12-21 15:20:29,566 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-12-21 15:20:29,567 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-12-21 15:20:29,567 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-12-21 15:20:29,570 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-12-21 15:20:29,571 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.12 03:20:28" (1/3) ... [2021-12-21 15:20:29,572 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@190d3458 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.12 03:20:29, skipping insertion in model container [2021-12-21 15:20:29,572 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 03:20:29" (2/3) ... [2021-12-21 15:20:29,572 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@190d3458 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.12 03:20:29, skipping insertion in model container [2021-12-21 15:20:29,572 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.12 03:20:29" (3/3) ... [2021-12-21 15:20:29,573 INFO L111 eAbstractionObserver]: Analyzing ICFG popl20-figure1.wvr.c [2021-12-21 15:20:29,578 WARN L149 ceAbstractionStarter]: Switching off computation of Hoare annotation because input is a concurrent program [2021-12-21 15:20:29,578 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-12-21 15:20:29,579 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-12-21 15:20:29,579 INFO L513 ceAbstractionStarter]: Constructing petrified ICFG for 1 thread instances. [2021-12-21 15:20:29,621 WARN L322 ript$VariableManager]: TermVariabe thread1Thread1of1ForFork1_~i~0 not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-12-21 15:20:29,622 WARN L322 ript$VariableManager]: TermVariabe thread1Thread1of1ForFork1_~i~0 not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-12-21 15:20:29,623 WARN L322 ript$VariableManager]: TermVariabe thread1Thread1of1ForFork1_~i~0 not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-12-21 15:20:29,623 WARN L322 ript$VariableManager]: TermVariabe thread1Thread1of1ForFork1_~i~0 not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-12-21 15:20:29,623 WARN L322 ript$VariableManager]: TermVariabe thread1Thread1of1ForFork1_~i~0 not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-12-21 15:20:29,638 WARN L322 ript$VariableManager]: TermVariabe thread1Thread1of1ForFork1_~i~0 not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-12-21 15:20:29,639 WARN L322 ript$VariableManager]: TermVariabe |thread1Thread1of1ForFork1_#res.base| not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-12-21 15:20:29,639 WARN L322 ript$VariableManager]: TermVariabe |thread1Thread1of1ForFork1_#res.offset| not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-12-21 15:20:29,639 WARN L322 ript$VariableManager]: TermVariabe |thread1Thread1of1ForFork1_#res.base| not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-12-21 15:20:29,640 WARN L322 ript$VariableManager]: TermVariabe |thread1Thread1of1ForFork1_#res.offset| not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-12-21 15:20:29,640 WARN L322 ript$VariableManager]: TermVariabe |thread1Thread1of1ForFork1_#t~post2| not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-12-21 15:20:29,640 WARN L322 ript$VariableManager]: TermVariabe |thread1Thread1of1ForFork1_#t~post2| not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-12-21 15:20:29,641 WARN L322 ript$VariableManager]: TermVariabe thread1Thread1of1ForFork1_~i~0 not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-12-21 15:20:29,641 WARN L322 ript$VariableManager]: TermVariabe |thread1Thread1of1ForFork1_#t~post1| not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-12-21 15:20:29,641 WARN L322 ript$VariableManager]: TermVariabe thread1Thread1of1ForFork1_~i~0 not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-12-21 15:20:29,641 WARN L322 ript$VariableManager]: TermVariabe |thread1Thread1of1ForFork1_#t~post1| not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-12-21 15:20:29,642 WARN L322 ript$VariableManager]: TermVariabe |thread1Thread1of1ForFork1_#t~post1| not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-12-21 15:20:29,642 WARN L322 ript$VariableManager]: TermVariabe thread1Thread1of1ForFork1_~i~0 not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-12-21 15:20:29,642 WARN L322 ript$VariableManager]: TermVariabe |thread1Thread1of1ForFork1_#t~post1| not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-12-21 15:20:29,642 WARN L322 ript$VariableManager]: TermVariabe thread1Thread1of1ForFork1_~i~0 not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-12-21 15:20:29,643 WARN L322 ript$VariableManager]: TermVariabe |thread1Thread1of1ForFork1_#t~post1| not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-12-21 15:20:29,643 WARN L322 ript$VariableManager]: TermVariabe |thread1Thread1of1ForFork1_#t~post1| not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-12-21 15:20:29,644 WARN L322 ript$VariableManager]: TermVariabe |thread2Thread1of1ForFork0_~i~1#1| not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-12-21 15:20:29,644 WARN L322 ript$VariableManager]: TermVariabe |thread2Thread1of1ForFork0_~i~1#1| not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-12-21 15:20:29,644 WARN L322 ript$VariableManager]: TermVariabe |thread2Thread1of1ForFork0_~i~1#1| not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-12-21 15:20:29,645 WARN L322 ript$VariableManager]: TermVariabe |thread2Thread1of1ForFork0_~i~1#1| not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-12-21 15:20:29,645 WARN L322 ript$VariableManager]: TermVariabe |thread2Thread1of1ForFork0_~i~1#1| not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-12-21 15:20:29,646 WARN L322 ript$VariableManager]: TermVariabe |thread2Thread1of1ForFork0_~i~1#1| not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-12-21 15:20:29,646 WARN L322 ript$VariableManager]: TermVariabe |thread2Thread1of1ForFork0_#res#1.base| not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-12-21 15:20:29,646 WARN L322 ript$VariableManager]: TermVariabe |thread2Thread1of1ForFork0_#res#1.offset| not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-12-21 15:20:29,647 WARN L322 ript$VariableManager]: TermVariabe |thread2Thread1of1ForFork0_#res#1.base| not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-12-21 15:20:29,647 WARN L322 ript$VariableManager]: TermVariabe |thread2Thread1of1ForFork0_#res#1.offset| not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-12-21 15:20:29,647 WARN L322 ript$VariableManager]: TermVariabe |thread2Thread1of1ForFork0_#t~post4#1| not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-12-21 15:20:29,647 WARN L322 ript$VariableManager]: TermVariabe |thread2Thread1of1ForFork0_assume_abort_if_not_#in~cond#1| not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-12-21 15:20:29,648 WARN L322 ript$VariableManager]: TermVariabe |thread2Thread1of1ForFork0_assume_abort_if_not_~cond#1| not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-12-21 15:20:29,648 WARN L322 ript$VariableManager]: TermVariabe |thread2Thread1of1ForFork0_#t~post4#1| not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-12-21 15:20:29,648 WARN L322 ript$VariableManager]: TermVariabe |thread2Thread1of1ForFork0_assume_abort_if_not_#in~cond#1| not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-12-21 15:20:29,649 WARN L322 ript$VariableManager]: TermVariabe |thread2Thread1of1ForFork0_assume_abort_if_not_~cond#1| not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-12-21 15:20:29,649 WARN L322 ript$VariableManager]: TermVariabe |thread2Thread1of1ForFork0_~i~1#1| not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-12-21 15:20:29,650 WARN L322 ript$VariableManager]: TermVariabe |thread2Thread1of1ForFork0_#t~post3#1| not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-12-21 15:20:29,650 WARN L322 ript$VariableManager]: TermVariabe |thread2Thread1of1ForFork0_~i~1#1| not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-12-21 15:20:29,650 WARN L322 ript$VariableManager]: TermVariabe |thread2Thread1of1ForFork0_#t~post3#1| not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-12-21 15:20:29,650 WARN L322 ript$VariableManager]: TermVariabe |thread2Thread1of1ForFork0_#t~post3#1| not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-12-21 15:20:29,651 WARN L322 ript$VariableManager]: TermVariabe |thread2Thread1of1ForFork0_~i~1#1| not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-12-21 15:20:29,651 WARN L322 ript$VariableManager]: TermVariabe |thread2Thread1of1ForFork0_#t~post3#1| not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-12-21 15:20:29,651 WARN L322 ript$VariableManager]: TermVariabe |thread2Thread1of1ForFork0_~i~1#1| not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-12-21 15:20:29,652 WARN L322 ript$VariableManager]: TermVariabe |thread2Thread1of1ForFork0_#t~post3#1| not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-12-21 15:20:29,652 WARN L322 ript$VariableManager]: TermVariabe |thread2Thread1of1ForFork0_#t~post3#1| not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-12-21 15:20:29,655 WARN L322 ript$VariableManager]: TermVariabe |thread2Thread1of1ForFork0_assume_abort_if_not_~cond#1| not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-12-21 15:20:29,655 WARN L322 ript$VariableManager]: TermVariabe |thread2Thread1of1ForFork0_#res#1.base| not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-12-21 15:20:29,655 WARN L322 ript$VariableManager]: TermVariabe |thread2Thread1of1ForFork0_#res#1.offset| not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-12-21 15:20:29,655 WARN L322 ript$VariableManager]: TermVariabe |thread2Thread1of1ForFork0_assume_abort_if_not_#in~cond#1| not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-12-21 15:20:29,656 WARN L322 ript$VariableManager]: TermVariabe |thread2Thread1of1ForFork0_~i~1#1| not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-12-21 15:20:29,656 WARN L322 ript$VariableManager]: TermVariabe |thread2Thread1of1ForFork0_#t~post3#1| not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-12-21 15:20:29,656 WARN L322 ript$VariableManager]: TermVariabe |thread2Thread1of1ForFork0_#t~post4#1| not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-12-21 15:20:29,659 WARN L322 ript$VariableManager]: TermVariabe |thread1Thread1of1ForFork1_#res.base| not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-12-21 15:20:29,659 WARN L322 ript$VariableManager]: TermVariabe |thread1Thread1of1ForFork1_#t~post1| not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-12-21 15:20:29,660 WARN L322 ript$VariableManager]: TermVariabe |thread1Thread1of1ForFork1_#t~post2| not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-12-21 15:20:29,660 WARN L322 ript$VariableManager]: TermVariabe thread1Thread1of1ForFork1_~i~0 not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-12-21 15:20:29,660 WARN L322 ript$VariableManager]: TermVariabe |thread1Thread1of1ForFork1_#res.offset| not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-12-21 15:20:29,665 INFO L148 ThreadInstanceAdder]: Constructed 2 joinOtherThreadTransitions. [2021-12-21 15:20:29,706 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-12-21 15:20:29,713 INFO L339 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, mLoopAccelerationTechnique=FAST_UPR [2021-12-21 15:20:29,713 INFO L340 AbstractCegarLoop]: Starting to check reachability of 3 error locations. [2021-12-21 15:20:29,728 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 79 places, 77 transitions, 170 flow [2021-12-21 15:20:29,760 INFO L129 PetriNetUnfolder]: 5/75 cut-off events. [2021-12-21 15:20:29,761 INFO L130 PetriNetUnfolder]: For 2/2 co-relation queries the response was YES. [2021-12-21 15:20:29,764 INFO L84 FinitePrefix]: Finished finitePrefix Result has 84 conditions, 75 events. 5/75 cut-off events. For 2/2 co-relation queries the response was YES. Maximal size of possible extension queue 3. Compared 50 event pairs, 0 based on Foata normal form. 0/69 useless extension candidates. Maximal degree in co-relation 40. Up to 2 conditions per place. [2021-12-21 15:20:29,764 INFO L82 GeneralOperation]: Start removeDead. Operand has 79 places, 77 transitions, 170 flow [2021-12-21 15:20:29,768 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 68 places, 66 transitions, 144 flow [2021-12-21 15:20:29,796 INFO L129 PetriNetUnfolder]: 5/65 cut-off events. [2021-12-21 15:20:29,796 INFO L130 PetriNetUnfolder]: For 2/2 co-relation queries the response was YES. [2021-12-21 15:20:29,796 INFO L246 CegarLoopForPetriNet]: Found error trace [2021-12-21 15:20:29,797 INFO L254 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] [2021-12-21 15:20:29,798 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr1INUSE_VIOLATION] === [2021-12-21 15:20:29,807 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 15:20:29,808 INFO L85 PathProgramCache]: Analyzing trace with hash 751055543, now seen corresponding path program 1 times [2021-12-21 15:20:29,815 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 15:20:29,816 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [181857887] [2021-12-21 15:20:29,816 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 15:20:29,817 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 15:20:29,946 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 15:20:30,168 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 15:20:30,169 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 15:20:30,169 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [181857887] [2021-12-21 15:20:30,170 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [181857887] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-21 15:20:30,171 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-21 15:20:30,171 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-12-21 15:20:30,173 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [942126921] [2021-12-21 15:20:30,175 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-21 15:20:30,183 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-12-21 15:20:30,184 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 15:20:30,207 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-12-21 15:20:30,208 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-12-21 15:20:30,215 INFO L499 CegarLoopForPetriNet]: Number of universal loopers: 61 out of 77 [2021-12-21 15:20:30,219 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 68 places, 66 transitions, 144 flow. Second operand has 5 states, 5 states have (on average 62.8) internal successors, (314), 5 states have internal predecessors, (314), 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) [2021-12-21 15:20:30,220 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-12-21 15:20:30,220 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 61 of 77 [2021-12-21 15:20:30,221 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-12-21 15:20:30,295 INFO L129 PetriNetUnfolder]: 8/105 cut-off events. [2021-12-21 15:20:30,296 INFO L130 PetriNetUnfolder]: For 21/22 co-relation queries the response was YES. [2021-12-21 15:20:30,297 INFO L84 FinitePrefix]: Finished finitePrefix Result has 149 conditions, 105 events. 8/105 cut-off events. For 21/22 co-relation queries the response was YES. Maximal size of possible extension queue 5. Compared 180 event pairs, 1 based on Foata normal form. 16/112 useless extension candidates. Maximal degree in co-relation 61. Up to 19 conditions per place. [2021-12-21 15:20:30,298 INFO L132 encePairwiseOnDemand]: 67/77 looper letters, 11 selfloop transitions, 2 changer transitions 7/71 dead transitions. [2021-12-21 15:20:30,299 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 73 places, 71 transitions, 203 flow [2021-12-21 15:20:30,300 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-12-21 15:20:30,302 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6 states. [2021-12-21 15:20:30,312 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6 states to 6 states and 394 transitions. [2021-12-21 15:20:30,317 INFO L544 CegarLoopForPetriNet]: DFA transition density 0.8528138528138528 [2021-12-21 15:20:30,318 INFO L72 ComplementDD]: Start complementDD. Operand 6 states and 394 transitions. [2021-12-21 15:20:30,318 INFO L73 IsDeterministic]: Start isDeterministic. Operand 6 states and 394 transitions. [2021-12-21 15:20:30,322 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-12-21 15:20:30,325 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 6 states and 394 transitions. [2021-12-21 15:20:30,330 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 7 states, 6 states have (on average 65.66666666666667) internal successors, (394), 6 states have internal predecessors, (394), 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) [2021-12-21 15:20:30,336 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 7 states, 7 states have (on average 77.0) internal successors, (539), 7 states have internal predecessors, (539), 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) [2021-12-21 15:20:30,337 INFO L81 ComplementDD]: Finished complementDD. Result has 7 states, 7 states have (on average 77.0) internal successors, (539), 7 states have internal predecessors, (539), 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) [2021-12-21 15:20:30,338 INFO L186 Difference]: Start difference. First operand has 68 places, 66 transitions, 144 flow. Second operand 6 states and 394 transitions. [2021-12-21 15:20:30,339 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 73 places, 71 transitions, 203 flow [2021-12-21 15:20:30,342 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 69 places, 71 transitions, 189 flow, removed 0 selfloop flow, removed 4 redundant places. [2021-12-21 15:20:30,347 INFO L242 Difference]: Finished difference. Result has 72 places, 63 transitions, 146 flow [2021-12-21 15:20:30,350 INFO L317 CegarLoopForPetriNet]: {PETRI_ALPHABET=77, PETRI_DIFFERENCE_MINUEND_FLOW=130, PETRI_DIFFERENCE_MINUEND_PLACES=64, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=63, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=61, PETRI_DIFFERENCE_SUBTRAHEND_STATES=6, PETRI_FLOW=146, PETRI_PLACES=72, PETRI_TRANSITIONS=63} [2021-12-21 15:20:30,356 INFO L334 CegarLoopForPetriNet]: 68 programPoint places, 4 predicate places. [2021-12-21 15:20:30,356 INFO L470 AbstractCegarLoop]: Abstraction has has 72 places, 63 transitions, 146 flow [2021-12-21 15:20:30,356 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 62.8) internal successors, (314), 5 states have internal predecessors, (314), 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) [2021-12-21 15:20:30,357 INFO L246 CegarLoopForPetriNet]: Found error trace [2021-12-21 15:20:30,357 INFO L254 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] [2021-12-21 15:20:30,357 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-12-21 15:20:30,358 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr1INUSE_VIOLATION] === [2021-12-21 15:20:30,359 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 15:20:30,360 INFO L85 PathProgramCache]: Analyzing trace with hash 600101581, now seen corresponding path program 1 times [2021-12-21 15:20:30,360 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 15:20:30,360 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2106967477] [2021-12-21 15:20:30,360 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 15:20:30,361 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 15:20:30,398 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 15:20:30,509 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 15:20:30,510 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 15:20:30,510 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2106967477] [2021-12-21 15:20:30,511 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2106967477] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-21 15:20:30,511 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-21 15:20:30,511 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-12-21 15:20:30,511 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1848225897] [2021-12-21 15:20:30,512 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-21 15:20:30,513 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-12-21 15:20:30,514 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 15:20:30,516 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-12-21 15:20:30,516 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-12-21 15:20:30,518 INFO L499 CegarLoopForPetriNet]: Number of universal loopers: 55 out of 77 [2021-12-21 15:20:30,519 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 72 places, 63 transitions, 146 flow. Second operand has 5 states, 5 states have (on average 57.8) internal successors, (289), 5 states have internal predecessors, (289), 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) [2021-12-21 15:20:30,519 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-12-21 15:20:30,519 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 55 of 77 [2021-12-21 15:20:30,520 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-12-21 15:20:30,693 INFO L129 PetriNetUnfolder]: 90/304 cut-off events. [2021-12-21 15:20:30,694 INFO L130 PetriNetUnfolder]: For 32/32 co-relation queries the response was YES. [2021-12-21 15:20:30,695 INFO L84 FinitePrefix]: Finished finitePrefix Result has 555 conditions, 304 events. 90/304 cut-off events. For 32/32 co-relation queries the response was YES. Maximal size of possible extension queue 21. Compared 1346 event pairs, 32 based on Foata normal form. 0/264 useless extension candidates. Maximal degree in co-relation 541. Up to 99 conditions per place. [2021-12-21 15:20:30,697 INFO L132 encePairwiseOnDemand]: 70/77 looper letters, 35 selfloop transitions, 5 changer transitions 4/88 dead transitions. [2021-12-21 15:20:30,697 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 73 places, 88 transitions, 301 flow [2021-12-21 15:20:30,698 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-12-21 15:20:30,698 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6 states. [2021-12-21 15:20:30,699 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6 states to 6 states and 372 transitions. [2021-12-21 15:20:30,699 INFO L544 CegarLoopForPetriNet]: DFA transition density 0.8051948051948052 [2021-12-21 15:20:30,700 INFO L72 ComplementDD]: Start complementDD. Operand 6 states and 372 transitions. [2021-12-21 15:20:30,700 INFO L73 IsDeterministic]: Start isDeterministic. Operand 6 states and 372 transitions. [2021-12-21 15:20:30,700 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-12-21 15:20:30,700 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 6 states and 372 transitions. [2021-12-21 15:20:30,702 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 7 states, 6 states have (on average 62.0) internal successors, (372), 6 states have internal predecessors, (372), 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) [2021-12-21 15:20:30,703 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 7 states, 7 states have (on average 77.0) internal successors, (539), 7 states have internal predecessors, (539), 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) [2021-12-21 15:20:30,704 INFO L81 ComplementDD]: Finished complementDD. Result has 7 states, 7 states have (on average 77.0) internal successors, (539), 7 states have internal predecessors, (539), 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) [2021-12-21 15:20:30,704 INFO L186 Difference]: Start difference. First operand has 72 places, 63 transitions, 146 flow. Second operand 6 states and 372 transitions. [2021-12-21 15:20:30,704 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 73 places, 88 transitions, 301 flow [2021-12-21 15:20:30,706 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 70 places, 88 transitions, 293 flow, removed 2 selfloop flow, removed 3 redundant places. [2021-12-21 15:20:30,708 INFO L242 Difference]: Finished difference. Result has 73 places, 65 transitions, 166 flow [2021-12-21 15:20:30,708 INFO L317 CegarLoopForPetriNet]: {PETRI_ALPHABET=77, PETRI_DIFFERENCE_MINUEND_FLOW=140, PETRI_DIFFERENCE_MINUEND_PLACES=65, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=63, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=3, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=58, PETRI_DIFFERENCE_SUBTRAHEND_STATES=6, PETRI_FLOW=166, PETRI_PLACES=73, PETRI_TRANSITIONS=65} [2021-12-21 15:20:30,709 INFO L334 CegarLoopForPetriNet]: 68 programPoint places, 5 predicate places. [2021-12-21 15:20:30,709 INFO L470 AbstractCegarLoop]: Abstraction has has 73 places, 65 transitions, 166 flow [2021-12-21 15:20:30,710 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 57.8) internal successors, (289), 5 states have internal predecessors, (289), 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) [2021-12-21 15:20:30,710 INFO L246 CegarLoopForPetriNet]: Found error trace [2021-12-21 15:20:30,710 INFO L254 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] [2021-12-21 15:20:30,710 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-12-21 15:20:30,711 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr1INUSE_VIOLATION] === [2021-12-21 15:20:30,711 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 15:20:30,711 INFO L85 PathProgramCache]: Analyzing trace with hash 651339935, now seen corresponding path program 2 times [2021-12-21 15:20:30,712 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 15:20:30,712 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [162877619] [2021-12-21 15:20:30,712 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 15:20:30,712 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 15:20:30,733 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 15:20:30,783 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 15:20:30,784 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 15:20:30,784 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [162877619] [2021-12-21 15:20:30,784 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [162877619] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 15:20:30,784 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [382026491] [2021-12-21 15:20:30,785 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-21 15:20:30,785 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 15:20:30,785 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 15:20:30,787 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) [2021-12-21 15:20:30,798 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-12-21 15:20:30,877 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-21 15:20:30,878 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 15:20:30,881 INFO L263 TraceCheckSpWp]: Trace formula consists of 138 conjuncts, 4 conjunts are in the unsatisfiable core [2021-12-21 15:20:30,887 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 15:20:31,074 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 15:20:31,075 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 15:20:31,171 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 15:20:31,171 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [382026491] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 15:20:31,172 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 15:20:31,172 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5, 5] total 9 [2021-12-21 15:20:31,172 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [972476902] [2021-12-21 15:20:31,172 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 15:20:31,176 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-12-21 15:20:31,176 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 15:20:31,177 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-12-21 15:20:31,177 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=48, Unknown=0, NotChecked=0, Total=72 [2021-12-21 15:20:31,178 INFO L499 CegarLoopForPetriNet]: Number of universal loopers: 55 out of 77 [2021-12-21 15:20:31,179 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 73 places, 65 transitions, 166 flow. Second operand has 9 states, 9 states have (on average 57.666666666666664) internal successors, (519), 9 states have internal predecessors, (519), 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) [2021-12-21 15:20:31,179 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-12-21 15:20:31,179 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 55 of 77 [2021-12-21 15:20:31,179 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-12-21 15:20:31,383 INFO L129 PetriNetUnfolder]: 147/407 cut-off events. [2021-12-21 15:20:31,383 INFO L130 PetriNetUnfolder]: For 129/137 co-relation queries the response was YES. [2021-12-21 15:20:31,385 INFO L84 FinitePrefix]: Finished finitePrefix Result has 895 conditions, 407 events. 147/407 cut-off events. For 129/137 co-relation queries the response was YES. Maximal size of possible extension queue 26. Compared 1890 event pairs, 12 based on Foata normal form. 11/413 useless extension candidates. Maximal degree in co-relation 727. Up to 54 conditions per place. [2021-12-21 15:20:31,387 INFO L132 encePairwiseOnDemand]: 69/77 looper letters, 54 selfloop transitions, 27 changer transitions 6/131 dead transitions. [2021-12-21 15:20:31,388 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 85 places, 131 transitions, 560 flow [2021-12-21 15:20:31,388 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-12-21 15:20:31,388 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2021-12-21 15:20:31,390 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 854 transitions. [2021-12-21 15:20:31,390 INFO L544 CegarLoopForPetriNet]: DFA transition density 0.7922077922077922 [2021-12-21 15:20:31,391 INFO L72 ComplementDD]: Start complementDD. Operand 14 states and 854 transitions. [2021-12-21 15:20:31,391 INFO L73 IsDeterministic]: Start isDeterministic. Operand 14 states and 854 transitions. [2021-12-21 15:20:31,391 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-12-21 15:20:31,392 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 14 states and 854 transitions. [2021-12-21 15:20:31,394 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 15 states, 14 states have (on average 61.0) internal successors, (854), 14 states have internal predecessors, (854), 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) [2021-12-21 15:20:31,396 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 15 states, 15 states have (on average 77.0) internal successors, (1155), 15 states have internal predecessors, (1155), 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) [2021-12-21 15:20:31,397 INFO L81 ComplementDD]: Finished complementDD. Result has 15 states, 15 states have (on average 77.0) internal successors, (1155), 15 states have internal predecessors, (1155), 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) [2021-12-21 15:20:31,397 INFO L186 Difference]: Start difference. First operand has 73 places, 65 transitions, 166 flow. Second operand 14 states and 854 transitions. [2021-12-21 15:20:31,397 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 85 places, 131 transitions, 560 flow [2021-12-21 15:20:31,400 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 82 places, 131 transitions, 535 flow, removed 5 selfloop flow, removed 3 redundant places. [2021-12-21 15:20:31,402 INFO L242 Difference]: Finished difference. Result has 89 places, 91 transitions, 342 flow [2021-12-21 15:20:31,402 INFO L317 CegarLoopForPetriNet]: {PETRI_ALPHABET=77, PETRI_DIFFERENCE_MINUEND_FLOW=158, PETRI_DIFFERENCE_MINUEND_PLACES=69, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=65, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=6, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=57, PETRI_DIFFERENCE_SUBTRAHEND_STATES=14, PETRI_FLOW=342, PETRI_PLACES=89, PETRI_TRANSITIONS=91} [2021-12-21 15:20:31,403 INFO L334 CegarLoopForPetriNet]: 68 programPoint places, 21 predicate places. [2021-12-21 15:20:31,403 INFO L470 AbstractCegarLoop]: Abstraction has has 89 places, 91 transitions, 342 flow [2021-12-21 15:20:31,404 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 57.666666666666664) internal successors, (519), 9 states have internal predecessors, (519), 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) [2021-12-21 15:20:31,404 INFO L246 CegarLoopForPetriNet]: Found error trace [2021-12-21 15:20:31,404 INFO L254 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] [2021-12-21 15:20:31,430 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2021-12-21 15:20:31,619 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 15:20:31,620 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr1INUSE_VIOLATION] === [2021-12-21 15:20:31,620 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 15:20:31,620 INFO L85 PathProgramCache]: Analyzing trace with hash 1948148621, now seen corresponding path program 3 times [2021-12-21 15:20:31,621 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 15:20:31,621 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1690364060] [2021-12-21 15:20:31,621 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 15:20:31,621 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 15:20:31,637 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 15:20:31,679 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 15:20:31,679 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 15:20:31,679 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1690364060] [2021-12-21 15:20:31,680 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1690364060] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-21 15:20:31,680 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-21 15:20:31,680 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-12-21 15:20:31,680 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [693256112] [2021-12-21 15:20:31,680 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-21 15:20:31,681 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-12-21 15:20:31,681 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 15:20:31,681 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-12-21 15:20:31,682 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-12-21 15:20:31,682 INFO L499 CegarLoopForPetriNet]: Number of universal loopers: 55 out of 77 [2021-12-21 15:20:31,683 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 89 places, 91 transitions, 342 flow. Second operand has 5 states, 5 states have (on average 57.8) internal successors, (289), 5 states have internal predecessors, (289), 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) [2021-12-21 15:20:31,683 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-12-21 15:20:31,683 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 55 of 77 [2021-12-21 15:20:31,684 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-12-21 15:20:31,771 INFO L129 PetriNetUnfolder]: 153/421 cut-off events. [2021-12-21 15:20:31,771 INFO L130 PetriNetUnfolder]: For 550/552 co-relation queries the response was YES. [2021-12-21 15:20:31,773 INFO L84 FinitePrefix]: Finished finitePrefix Result has 1197 conditions, 421 events. 153/421 cut-off events. For 550/552 co-relation queries the response was YES. Maximal size of possible extension queue 28. Compared 1942 event pairs, 64 based on Foata normal form. 3/417 useless extension candidates. Maximal degree in co-relation 944. Up to 221 conditions per place. [2021-12-21 15:20:31,776 INFO L132 encePairwiseOnDemand]: 71/77 looper letters, 55 selfloop transitions, 13 changer transitions 0/112 dead transitions. [2021-12-21 15:20:31,777 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 93 places, 112 transitions, 582 flow [2021-12-21 15:20:31,777 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-12-21 15:20:31,777 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5 states. [2021-12-21 15:20:31,778 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5 states to 5 states and 317 transitions. [2021-12-21 15:20:31,778 INFO L544 CegarLoopForPetriNet]: DFA transition density 0.8233766233766234 [2021-12-21 15:20:31,778 INFO L72 ComplementDD]: Start complementDD. Operand 5 states and 317 transitions. [2021-12-21 15:20:31,779 INFO L73 IsDeterministic]: Start isDeterministic. Operand 5 states and 317 transitions. [2021-12-21 15:20:31,779 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-12-21 15:20:31,779 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 5 states and 317 transitions. [2021-12-21 15:20:31,780 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 6 states, 5 states have (on average 63.4) internal successors, (317), 5 states have internal predecessors, (317), 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) [2021-12-21 15:20:31,781 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 6 states, 6 states have (on average 77.0) internal successors, (462), 6 states have internal predecessors, (462), 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) [2021-12-21 15:20:31,781 INFO L81 ComplementDD]: Finished complementDD. Result has 6 states, 6 states have (on average 77.0) internal successors, (462), 6 states have internal predecessors, (462), 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) [2021-12-21 15:20:31,781 INFO L186 Difference]: Start difference. First operand has 89 places, 91 transitions, 342 flow. Second operand 5 states and 317 transitions. [2021-12-21 15:20:31,781 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 93 places, 112 transitions, 582 flow [2021-12-21 15:20:31,787 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 93 places, 112 transitions, 578 flow, removed 2 selfloop flow, removed 0 redundant places. [2021-12-21 15:20:31,792 INFO L242 Difference]: Finished difference. Result has 95 places, 96 transitions, 415 flow [2021-12-21 15:20:31,792 INFO L317 CegarLoopForPetriNet]: {PETRI_ALPHABET=77, PETRI_DIFFERENCE_MINUEND_FLOW=338, PETRI_DIFFERENCE_MINUEND_PLACES=89, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=91, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=8, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=81, PETRI_DIFFERENCE_SUBTRAHEND_STATES=5, PETRI_FLOW=415, PETRI_PLACES=95, PETRI_TRANSITIONS=96} [2021-12-21 15:20:31,793 INFO L334 CegarLoopForPetriNet]: 68 programPoint places, 27 predicate places. [2021-12-21 15:20:31,793 INFO L470 AbstractCegarLoop]: Abstraction has has 95 places, 96 transitions, 415 flow [2021-12-21 15:20:31,794 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 57.8) internal successors, (289), 5 states have internal predecessors, (289), 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) [2021-12-21 15:20:31,794 INFO L246 CegarLoopForPetriNet]: Found error trace [2021-12-21 15:20:31,794 INFO L254 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] [2021-12-21 15:20:31,794 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-12-21 15:20:31,794 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr1INUSE_VIOLATION] === [2021-12-21 15:20:31,795 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 15:20:31,795 INFO L85 PathProgramCache]: Analyzing trace with hash -497140103, now seen corresponding path program 4 times [2021-12-21 15:20:31,795 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 15:20:31,795 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1977717067] [2021-12-21 15:20:31,796 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 15:20:31,796 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 15:20:31,810 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 15:20:31,859 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 15:20:31,860 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 15:20:31,860 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1977717067] [2021-12-21 15:20:31,860 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1977717067] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 15:20:31,861 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1718821628] [2021-12-21 15:20:31,861 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-12-21 15:20:31,861 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 15:20:31,861 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 15:20:31,862 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) [2021-12-21 15:20:31,864 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-12-21 15:20:31,911 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-12-21 15:20:31,912 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 15:20:31,913 INFO L263 TraceCheckSpWp]: Trace formula consists of 120 conjuncts, 4 conjunts are in the unsatisfiable core [2021-12-21 15:20:31,914 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 15:20:32,048 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 15:20:32,049 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 15:20:32,146 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 15:20:32,146 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1718821628] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 15:20:32,146 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 15:20:32,147 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5, 5] total 11 [2021-12-21 15:20:32,147 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1102205933] [2021-12-21 15:20:32,147 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 15:20:32,148 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-12-21 15:20:32,149 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 15:20:32,150 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-12-21 15:20:32,150 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=70, Unknown=0, NotChecked=0, Total=110 [2021-12-21 15:20:32,152 INFO L499 CegarLoopForPetriNet]: Number of universal loopers: 55 out of 77 [2021-12-21 15:20:32,153 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 95 places, 96 transitions, 415 flow. Second operand has 11 states, 11 states have (on average 57.81818181818182) internal successors, (636), 11 states have internal predecessors, (636), 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) [2021-12-21 15:20:32,153 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-12-21 15:20:32,153 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 55 of 77 [2021-12-21 15:20:32,153 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-12-21 15:20:32,343 INFO L129 PetriNetUnfolder]: 165/506 cut-off events. [2021-12-21 15:20:32,344 INFO L130 PetriNetUnfolder]: For 900/902 co-relation queries the response was YES. [2021-12-21 15:20:32,346 INFO L84 FinitePrefix]: Finished finitePrefix Result has 1419 conditions, 506 events. 165/506 cut-off events. For 900/902 co-relation queries the response was YES. Maximal size of possible extension queue 36. Compared 2591 event pairs, 36 based on Foata normal form. 9/508 useless extension candidates. Maximal degree in co-relation 1102. Up to 114 conditions per place. [2021-12-21 15:20:32,349 INFO L132 encePairwiseOnDemand]: 69/77 looper letters, 66 selfloop transitions, 39 changer transitions 0/149 dead transitions. [2021-12-21 15:20:32,350 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 103 places, 149 transitions, 883 flow [2021-12-21 15:20:32,350 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-12-21 15:20:32,350 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 9 states. [2021-12-21 15:20:32,352 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9 states to 9 states and 564 transitions. [2021-12-21 15:20:32,352 INFO L544 CegarLoopForPetriNet]: DFA transition density 0.8138528138528138 [2021-12-21 15:20:32,352 INFO L72 ComplementDD]: Start complementDD. Operand 9 states and 564 transitions. [2021-12-21 15:20:32,352 INFO L73 IsDeterministic]: Start isDeterministic. Operand 9 states and 564 transitions. [2021-12-21 15:20:32,353 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-12-21 15:20:32,353 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 9 states and 564 transitions. [2021-12-21 15:20:32,354 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 10 states, 9 states have (on average 62.666666666666664) internal successors, (564), 9 states have internal predecessors, (564), 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) [2021-12-21 15:20:32,355 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 10 states, 10 states have (on average 77.0) internal successors, (770), 10 states have internal predecessors, (770), 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) [2021-12-21 15:20:32,356 INFO L81 ComplementDD]: Finished complementDD. Result has 10 states, 10 states have (on average 77.0) internal successors, (770), 10 states have internal predecessors, (770), 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) [2021-12-21 15:20:32,356 INFO L186 Difference]: Start difference. First operand has 95 places, 96 transitions, 415 flow. Second operand 9 states and 564 transitions. [2021-12-21 15:20:32,356 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 103 places, 149 transitions, 883 flow [2021-12-21 15:20:32,361 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 102 places, 149 transitions, 867 flow, removed 2 selfloop flow, removed 1 redundant places. [2021-12-21 15:20:32,363 INFO L242 Difference]: Finished difference. Result has 107 places, 113 transitions, 648 flow [2021-12-21 15:20:32,364 INFO L317 CegarLoopForPetriNet]: {PETRI_ALPHABET=77, PETRI_DIFFERENCE_MINUEND_FLOW=403, PETRI_DIFFERENCE_MINUEND_PLACES=94, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=96, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=25, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=65, PETRI_DIFFERENCE_SUBTRAHEND_STATES=9, PETRI_FLOW=648, PETRI_PLACES=107, PETRI_TRANSITIONS=113} [2021-12-21 15:20:32,364 INFO L334 CegarLoopForPetriNet]: 68 programPoint places, 39 predicate places. [2021-12-21 15:20:32,364 INFO L470 AbstractCegarLoop]: Abstraction has has 107 places, 113 transitions, 648 flow [2021-12-21 15:20:32,365 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 57.81818181818182) internal successors, (636), 11 states have internal predecessors, (636), 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) [2021-12-21 15:20:32,365 INFO L246 CegarLoopForPetriNet]: Found error trace [2021-12-21 15:20:32,365 INFO L254 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] [2021-12-21 15:20:32,390 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-12-21 15:20:32,589 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 15:20:32,589 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr1INUSE_VIOLATION] === [2021-12-21 15:20:32,590 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 15:20:32,590 INFO L85 PathProgramCache]: Analyzing trace with hash -1146310219, now seen corresponding path program 5 times [2021-12-21 15:20:32,590 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 15:20:32,590 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1165644042] [2021-12-21 15:20:32,590 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 15:20:32,591 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 15:20:32,605 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 15:20:32,667 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 15:20:32,668 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 15:20:32,668 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1165644042] [2021-12-21 15:20:32,668 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1165644042] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 15:20:32,668 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1358570579] [2021-12-21 15:20:32,669 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-12-21 15:20:32,669 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 15:20:32,669 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 15:20:32,670 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) [2021-12-21 15:20:32,691 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-12-21 15:20:32,742 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-21 15:20:32,742 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 15:20:32,743 INFO L263 TraceCheckSpWp]: Trace formula consists of 138 conjuncts, 4 conjunts are in the unsatisfiable core [2021-12-21 15:20:32,745 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 15:20:32,881 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 15:20:32,881 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 15:20:32,965 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 15:20:32,966 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1358570579] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 15:20:32,966 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 15:20:32,966 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5, 5] total 11 [2021-12-21 15:20:32,966 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1342671128] [2021-12-21 15:20:32,967 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 15:20:32,967 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-12-21 15:20:32,967 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 15:20:32,968 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-12-21 15:20:32,969 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=73, Unknown=0, NotChecked=0, Total=110 [2021-12-21 15:20:32,970 INFO L499 CegarLoopForPetriNet]: Number of universal loopers: 55 out of 77 [2021-12-21 15:20:32,970 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 107 places, 113 transitions, 648 flow. Second operand has 11 states, 11 states have (on average 57.81818181818182) internal successors, (636), 11 states have internal predecessors, (636), 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) [2021-12-21 15:20:32,971 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-12-21 15:20:32,971 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 55 of 77 [2021-12-21 15:20:32,971 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-12-21 15:20:33,156 INFO L129 PetriNetUnfolder]: 200/610 cut-off events. [2021-12-21 15:20:33,156 INFO L130 PetriNetUnfolder]: For 1371/1373 co-relation queries the response was YES. [2021-12-21 15:20:33,159 INFO L84 FinitePrefix]: Finished finitePrefix Result has 1847 conditions, 610 events. 200/610 cut-off events. For 1371/1373 co-relation queries the response was YES. Maximal size of possible extension queue 47. Compared 3446 event pairs, 16 based on Foata normal form. 11/615 useless extension candidates. Maximal degree in co-relation 1509. Up to 106 conditions per place. [2021-12-21 15:20:33,162 INFO L132 encePairwiseOnDemand]: 69/77 looper letters, 64 selfloop transitions, 52 changer transitions 2/162 dead transitions. [2021-12-21 15:20:33,162 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 118 places, 162 transitions, 1131 flow [2021-12-21 15:20:33,162 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-12-21 15:20:33,163 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2021-12-21 15:20:33,164 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 743 transitions. [2021-12-21 15:20:33,165 INFO L544 CegarLoopForPetriNet]: DFA transition density 0.8041125541125541 [2021-12-21 15:20:33,165 INFO L72 ComplementDD]: Start complementDD. Operand 12 states and 743 transitions. [2021-12-21 15:20:33,165 INFO L73 IsDeterministic]: Start isDeterministic. Operand 12 states and 743 transitions. [2021-12-21 15:20:33,165 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-12-21 15:20:33,166 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 12 states and 743 transitions. [2021-12-21 15:20:33,167 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 13 states, 12 states have (on average 61.916666666666664) internal successors, (743), 12 states have internal predecessors, (743), 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) [2021-12-21 15:20:33,169 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 13 states, 13 states have (on average 77.0) internal successors, (1001), 13 states have internal predecessors, (1001), 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) [2021-12-21 15:20:33,171 INFO L81 ComplementDD]: Finished complementDD. Result has 13 states, 13 states have (on average 77.0) internal successors, (1001), 13 states have internal predecessors, (1001), 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) [2021-12-21 15:20:33,171 INFO L186 Difference]: Start difference. First operand has 107 places, 113 transitions, 648 flow. Second operand 12 states and 743 transitions. [2021-12-21 15:20:33,171 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 118 places, 162 transitions, 1131 flow [2021-12-21 15:20:33,178 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 118 places, 162 transitions, 1117 flow, removed 7 selfloop flow, removed 0 redundant places. [2021-12-21 15:20:33,184 INFO L242 Difference]: Finished difference. Result has 121 places, 123 transitions, 850 flow [2021-12-21 15:20:33,184 INFO L317 CegarLoopForPetriNet]: {PETRI_ALPHABET=77, PETRI_DIFFERENCE_MINUEND_FLOW=629, PETRI_DIFFERENCE_MINUEND_PLACES=107, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=112, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=40, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=70, PETRI_DIFFERENCE_SUBTRAHEND_STATES=12, PETRI_FLOW=850, PETRI_PLACES=121, PETRI_TRANSITIONS=123} [2021-12-21 15:20:33,186 INFO L334 CegarLoopForPetriNet]: 68 programPoint places, 53 predicate places. [2021-12-21 15:20:33,187 INFO L470 AbstractCegarLoop]: Abstraction has has 121 places, 123 transitions, 850 flow [2021-12-21 15:20:33,188 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 57.81818181818182) internal successors, (636), 11 states have internal predecessors, (636), 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) [2021-12-21 15:20:33,188 INFO L246 CegarLoopForPetriNet]: Found error trace [2021-12-21 15:20:33,189 INFO L254 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] [2021-12-21 15:20:33,214 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-12-21 15:20:33,412 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 15:20:33,412 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr1INUSE_VIOLATION] === [2021-12-21 15:20:33,412 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 15:20:33,413 INFO L85 PathProgramCache]: Analyzing trace with hash -1190561105, now seen corresponding path program 6 times [2021-12-21 15:20:33,413 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 15:20:33,413 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [989669314] [2021-12-21 15:20:33,413 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 15:20:33,413 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 15:20:33,424 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 15:20:33,452 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 15:20:33,452 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 15:20:33,453 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [989669314] [2021-12-21 15:20:33,453 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [989669314] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-21 15:20:33,453 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-21 15:20:33,453 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-12-21 15:20:33,453 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1023644598] [2021-12-21 15:20:33,453 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-21 15:20:33,454 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-12-21 15:20:33,454 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 15:20:33,454 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-12-21 15:20:33,454 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-12-21 15:20:33,455 INFO L499 CegarLoopForPetriNet]: Number of universal loopers: 55 out of 77 [2021-12-21 15:20:33,455 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 121 places, 123 transitions, 850 flow. Second operand has 5 states, 5 states have (on average 57.8) internal successors, (289), 5 states have internal predecessors, (289), 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) [2021-12-21 15:20:33,456 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-12-21 15:20:33,456 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 55 of 77 [2021-12-21 15:20:33,456 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-12-21 15:20:33,597 INFO L129 PetriNetUnfolder]: 199/570 cut-off events. [2021-12-21 15:20:33,598 INFO L130 PetriNetUnfolder]: For 1517/1519 co-relation queries the response was YES. [2021-12-21 15:20:33,600 INFO L84 FinitePrefix]: Finished finitePrefix Result has 1920 conditions, 570 events. 199/570 cut-off events. For 1517/1519 co-relation queries the response was YES. Maximal size of possible extension queue 46. Compared 3139 event pairs, 91 based on Foata normal form. 1/561 useless extension candidates. Maximal degree in co-relation 1618. Up to 231 conditions per place. [2021-12-21 15:20:33,603 INFO L132 encePairwiseOnDemand]: 71/77 looper letters, 68 selfloop transitions, 23 changer transitions 2/137 dead transitions. [2021-12-21 15:20:33,603 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 124 places, 137 transitions, 1111 flow [2021-12-21 15:20:33,604 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-12-21 15:20:33,604 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5 states. [2021-12-21 15:20:33,605 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5 states to 5 states and 315 transitions. [2021-12-21 15:20:33,605 INFO L544 CegarLoopForPetriNet]: DFA transition density 0.8181818181818182 [2021-12-21 15:20:33,605 INFO L72 ComplementDD]: Start complementDD. Operand 5 states and 315 transitions. [2021-12-21 15:20:33,605 INFO L73 IsDeterministic]: Start isDeterministic. Operand 5 states and 315 transitions. [2021-12-21 15:20:33,605 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-12-21 15:20:33,606 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 5 states and 315 transitions. [2021-12-21 15:20:33,606 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 6 states, 5 states have (on average 63.0) internal successors, (315), 5 states have internal predecessors, (315), 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) [2021-12-21 15:20:33,607 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 6 states, 6 states have (on average 77.0) internal successors, (462), 6 states have internal predecessors, (462), 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) [2021-12-21 15:20:33,607 INFO L81 ComplementDD]: Finished complementDD. Result has 6 states, 6 states have (on average 77.0) internal successors, (462), 6 states have internal predecessors, (462), 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) [2021-12-21 15:20:33,608 INFO L186 Difference]: Start difference. First operand has 121 places, 123 transitions, 850 flow. Second operand 5 states and 315 transitions. [2021-12-21 15:20:33,608 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 124 places, 137 transitions, 1111 flow [2021-12-21 15:20:33,614 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 121 places, 137 transitions, 1086 flow, removed 3 selfloop flow, removed 3 redundant places. [2021-12-21 15:20:33,616 INFO L242 Difference]: Finished difference. Result has 122 places, 122 transitions, 849 flow [2021-12-21 15:20:33,617 INFO L317 CegarLoopForPetriNet]: {PETRI_ALPHABET=77, PETRI_DIFFERENCE_MINUEND_FLOW=825, PETRI_DIFFERENCE_MINUEND_PLACES=117, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=123, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=23, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=100, PETRI_DIFFERENCE_SUBTRAHEND_STATES=5, PETRI_FLOW=849, PETRI_PLACES=122, PETRI_TRANSITIONS=122} [2021-12-21 15:20:33,617 INFO L334 CegarLoopForPetriNet]: 68 programPoint places, 54 predicate places. [2021-12-21 15:20:33,617 INFO L470 AbstractCegarLoop]: Abstraction has has 122 places, 122 transitions, 849 flow [2021-12-21 15:20:33,618 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 57.8) internal successors, (289), 5 states have internal predecessors, (289), 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) [2021-12-21 15:20:33,618 INFO L246 CegarLoopForPetriNet]: Found error trace [2021-12-21 15:20:33,618 INFO L254 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, 1, 1, 1, 1] [2021-12-21 15:20:33,618 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-12-21 15:20:33,618 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr1INUSE_VIOLATION] === [2021-12-21 15:20:33,619 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 15:20:33,619 INFO L85 PathProgramCache]: Analyzing trace with hash 1682419139, now seen corresponding path program 1 times [2021-12-21 15:20:33,619 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 15:20:33,619 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1104502098] [2021-12-21 15:20:33,619 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 15:20:33,620 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 15:20:33,634 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 15:20:33,685 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-21 15:20:33,686 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 15:20:33,686 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1104502098] [2021-12-21 15:20:33,686 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1104502098] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 15:20:33,686 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [779300363] [2021-12-21 15:20:33,686 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 15:20:33,687 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 15:20:33,687 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 15:20:33,688 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) [2021-12-21 15:20:33,716 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-12-21 15:20:33,747 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 15:20:33,748 INFO L263 TraceCheckSpWp]: Trace formula consists of 151 conjuncts, 11 conjunts are in the unsatisfiable core [2021-12-21 15:20:33,751 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 15:20:33,861 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-21 15:20:33,861 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 15:20:33,975 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-21 15:20:33,976 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [779300363] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 15:20:33,976 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 15:20:33,976 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 6 [2021-12-21 15:20:33,976 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1565259639] [2021-12-21 15:20:33,977 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 15:20:33,977 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-12-21 15:20:33,977 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 15:20:33,978 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-12-21 15:20:33,978 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-12-21 15:20:33,978 INFO L499 CegarLoopForPetriNet]: Number of universal loopers: 61 out of 77 [2021-12-21 15:20:33,979 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 122 places, 122 transitions, 849 flow. Second operand has 6 states, 6 states have (on average 62.833333333333336) internal successors, (377), 6 states have internal predecessors, (377), 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) [2021-12-21 15:20:33,979 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-12-21 15:20:33,979 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 61 of 77 [2021-12-21 15:20:33,979 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-12-21 15:20:34,101 INFO L129 PetriNetUnfolder]: 103/595 cut-off events. [2021-12-21 15:20:34,102 INFO L130 PetriNetUnfolder]: For 1064/1093 co-relation queries the response was YES. [2021-12-21 15:20:34,105 INFO L84 FinitePrefix]: Finished finitePrefix Result has 1612 conditions, 595 events. 103/595 cut-off events. For 1064/1093 co-relation queries the response was YES. Maximal size of possible extension queue 44. Compared 3915 event pairs, 10 based on Foata normal form. 12/597 useless extension candidates. Maximal degree in co-relation 1465. Up to 79 conditions per place. [2021-12-21 15:20:34,107 INFO L132 encePairwiseOnDemand]: 71/77 looper letters, 18 selfloop transitions, 5 changer transitions 5/137 dead transitions. [2021-12-21 15:20:34,107 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 125 places, 137 transitions, 939 flow [2021-12-21 15:20:34,107 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-12-21 15:20:34,107 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6 states. [2021-12-21 15:20:34,108 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6 states to 6 states and 395 transitions. [2021-12-21 15:20:34,109 INFO L544 CegarLoopForPetriNet]: DFA transition density 0.854978354978355 [2021-12-21 15:20:34,109 INFO L72 ComplementDD]: Start complementDD. Operand 6 states and 395 transitions. [2021-12-21 15:20:34,109 INFO L73 IsDeterministic]: Start isDeterministic. Operand 6 states and 395 transitions. [2021-12-21 15:20:34,109 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-12-21 15:20:34,109 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 6 states and 395 transitions. [2021-12-21 15:20:34,110 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 7 states, 6 states have (on average 65.83333333333333) internal successors, (395), 6 states have internal predecessors, (395), 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) [2021-12-21 15:20:34,111 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 7 states, 7 states have (on average 77.0) internal successors, (539), 7 states have internal predecessors, (539), 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) [2021-12-21 15:20:34,112 INFO L81 ComplementDD]: Finished complementDD. Result has 7 states, 7 states have (on average 77.0) internal successors, (539), 7 states have internal predecessors, (539), 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) [2021-12-21 15:20:34,112 INFO L186 Difference]: Start difference. First operand has 122 places, 122 transitions, 849 flow. Second operand 6 states and 395 transitions. [2021-12-21 15:20:34,112 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 125 places, 137 transitions, 939 flow [2021-12-21 15:20:34,117 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 114 places, 137 transitions, 829 flow, removed 3 selfloop flow, removed 11 redundant places. [2021-12-21 15:20:34,119 INFO L242 Difference]: Finished difference. Result has 118 places, 124 transitions, 771 flow [2021-12-21 15:20:34,119 INFO L317 CegarLoopForPetriNet]: {PETRI_ALPHABET=77, PETRI_DIFFERENCE_MINUEND_FLOW=729, PETRI_DIFFERENCE_MINUEND_PLACES=109, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=121, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=3, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=117, PETRI_DIFFERENCE_SUBTRAHEND_STATES=6, PETRI_FLOW=771, PETRI_PLACES=118, PETRI_TRANSITIONS=124} [2021-12-21 15:20:34,120 INFO L334 CegarLoopForPetriNet]: 68 programPoint places, 50 predicate places. [2021-12-21 15:20:34,120 INFO L470 AbstractCegarLoop]: Abstraction has has 118 places, 124 transitions, 771 flow [2021-12-21 15:20:34,120 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 62.833333333333336) internal successors, (377), 6 states have internal predecessors, (377), 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) [2021-12-21 15:20:34,120 INFO L246 CegarLoopForPetriNet]: Found error trace [2021-12-21 15:20:34,121 INFO L254 CegarLoopForPetriNet]: trace histogram [2, 2, 2, 2, 2, 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] [2021-12-21 15:20:34,150 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-12-21 15:20:34,347 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 15:20:34,347 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr1INUSE_VIOLATION] === [2021-12-21 15:20:34,348 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 15:20:34,348 INFO L85 PathProgramCache]: Analyzing trace with hash -1656979189, now seen corresponding path program 2 times [2021-12-21 15:20:34,348 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 15:20:34,348 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [573092165] [2021-12-21 15:20:34,348 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 15:20:34,348 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 15:20:34,366 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 15:20:34,438 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 15:20:34,438 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 15:20:34,439 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [573092165] [2021-12-21 15:20:34,439 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [573092165] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 15:20:34,439 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2020192023] [2021-12-21 15:20:34,439 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-21 15:20:34,439 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 15:20:34,439 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 15:20:34,440 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) [2021-12-21 15:20:34,446 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-12-21 15:20:34,496 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-21 15:20:34,496 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 15:20:34,497 INFO L263 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 8 conjunts are in the unsatisfiable core [2021-12-21 15:20:34,499 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 15:20:34,704 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 1 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 15:20:34,704 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 15:20:34,840 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 15:20:34,840 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2020192023] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 15:20:34,841 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 15:20:34,841 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 8] total 19 [2021-12-21 15:20:34,841 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1529574387] [2021-12-21 15:20:34,841 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 15:20:34,842 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2021-12-21 15:20:34,842 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 15:20:34,842 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-12-21 15:20:34,842 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=274, Unknown=0, NotChecked=0, Total=342 [2021-12-21 15:20:34,843 INFO L499 CegarLoopForPetriNet]: Number of universal loopers: 53 out of 77 [2021-12-21 15:20:34,844 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 118 places, 124 transitions, 771 flow. Second operand has 19 states, 19 states have (on average 55.78947368421053) internal successors, (1060), 19 states have internal predecessors, (1060), 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) [2021-12-21 15:20:34,845 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-12-21 15:20:34,845 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 53 of 77 [2021-12-21 15:20:34,845 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-12-21 15:20:36,337 INFO L129 PetriNetUnfolder]: 1266/3622 cut-off events. [2021-12-21 15:20:36,337 INFO L130 PetriNetUnfolder]: For 5997/5997 co-relation queries the response was YES. [2021-12-21 15:20:36,350 INFO L84 FinitePrefix]: Finished finitePrefix Result has 11411 conditions, 3622 events. 1266/3622 cut-off events. For 5997/5997 co-relation queries the response was YES. Maximal size of possible extension queue 187. Compared 30698 event pairs, 136 based on Foata normal form. 34/3644 useless extension candidates. Maximal degree in co-relation 11308. Up to 388 conditions per place. [2021-12-21 15:20:36,366 INFO L132 encePairwiseOnDemand]: 65/77 looper letters, 231 selfloop transitions, 207 changer transitions 28/508 dead transitions. [2021-12-21 15:20:36,366 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 176 places, 508 transitions, 4079 flow [2021-12-21 15:20:36,367 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2021-12-21 15:20:36,367 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2021-12-21 15:20:36,372 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 3555 transitions. [2021-12-21 15:20:36,374 INFO L544 CegarLoopForPetriNet]: DFA transition density 0.7568660847349372 [2021-12-21 15:20:36,374 INFO L72 ComplementDD]: Start complementDD. Operand 61 states and 3555 transitions. [2021-12-21 15:20:36,374 INFO L73 IsDeterministic]: Start isDeterministic. Operand 61 states and 3555 transitions. [2021-12-21 15:20:36,376 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-12-21 15:20:36,376 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 61 states and 3555 transitions. [2021-12-21 15:20:36,383 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 62 states, 61 states have (on average 58.278688524590166) internal successors, (3555), 61 states have internal predecessors, (3555), 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) [2021-12-21 15:20:36,390 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 62 states, 62 states have (on average 77.0) internal successors, (4774), 62 states have internal predecessors, (4774), 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) [2021-12-21 15:20:36,392 INFO L81 ComplementDD]: Finished complementDD. Result has 62 states, 62 states have (on average 77.0) internal successors, (4774), 62 states have internal predecessors, (4774), 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) [2021-12-21 15:20:36,392 INFO L186 Difference]: Start difference. First operand has 118 places, 124 transitions, 771 flow. Second operand 61 states and 3555 transitions. [2021-12-21 15:20:36,392 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 176 places, 508 transitions, 4079 flow [2021-12-21 15:20:36,404 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 174 places, 508 transitions, 4007 flow, removed 36 selfloop flow, removed 2 redundant places. [2021-12-21 15:20:36,410 INFO L242 Difference]: Finished difference. Result has 190 places, 327 transitions, 2668 flow [2021-12-21 15:20:36,411 INFO L317 CegarLoopForPetriNet]: {PETRI_ALPHABET=77, PETRI_DIFFERENCE_MINUEND_FLOW=763, PETRI_DIFFERENCE_MINUEND_PLACES=114, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=124, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=50, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=69, PETRI_DIFFERENCE_SUBTRAHEND_STATES=61, PETRI_FLOW=2668, PETRI_PLACES=190, PETRI_TRANSITIONS=327} [2021-12-21 15:20:36,411 INFO L334 CegarLoopForPetriNet]: 68 programPoint places, 122 predicate places. [2021-12-21 15:20:36,411 INFO L470 AbstractCegarLoop]: Abstraction has has 190 places, 327 transitions, 2668 flow [2021-12-21 15:20:36,412 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 55.78947368421053) internal successors, (1060), 19 states have internal predecessors, (1060), 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) [2021-12-21 15:20:36,412 INFO L246 CegarLoopForPetriNet]: Found error trace [2021-12-21 15:20:36,412 INFO L254 CegarLoopForPetriNet]: trace histogram [2, 2, 2, 2, 2, 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] [2021-12-21 15:20:36,435 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-12-21 15:20:36,632 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 15:20:36,632 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr1INUSE_VIOLATION] === [2021-12-21 15:20:36,633 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 15:20:36,633 INFO L85 PathProgramCache]: Analyzing trace with hash -1790021439, now seen corresponding path program 3 times [2021-12-21 15:20:36,633 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 15:20:36,633 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [520271793] [2021-12-21 15:20:36,633 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 15:20:36,633 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 15:20:36,645 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 15:20:36,724 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 15:20:36,725 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 15:20:36,725 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [520271793] [2021-12-21 15:20:36,725 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [520271793] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 15:20:36,725 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1040847127] [2021-12-21 15:20:36,725 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-12-21 15:20:36,725 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 15:20:36,725 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 15:20:36,726 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) [2021-12-21 15:20:36,728 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-12-21 15:20:36,785 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-12-21 15:20:36,785 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 15:20:36,786 INFO L263 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 8 conjunts are in the unsatisfiable core [2021-12-21 15:20:36,787 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 15:20:36,986 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 1 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 15:20:36,986 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 15:20:37,146 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 1 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 15:20:37,146 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1040847127] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 15:20:37,147 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 15:20:37,147 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 16 [2021-12-21 15:20:37,147 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1370864018] [2021-12-21 15:20:37,147 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 15:20:37,148 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-12-21 15:20:37,148 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 15:20:37,148 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-12-21 15:20:37,148 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=191, Unknown=0, NotChecked=0, Total=240 [2021-12-21 15:20:37,149 INFO L499 CegarLoopForPetriNet]: Number of universal loopers: 53 out of 77 [2021-12-21 15:20:37,150 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 190 places, 327 transitions, 2668 flow. Second operand has 16 states, 16 states have (on average 55.75) internal successors, (892), 16 states have internal predecessors, (892), 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) [2021-12-21 15:20:37,150 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-12-21 15:20:37,150 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 53 of 77 [2021-12-21 15:20:37,150 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-12-21 15:20:38,190 INFO L129 PetriNetUnfolder]: 1421/4102 cut-off events. [2021-12-21 15:20:38,190 INFO L130 PetriNetUnfolder]: For 17951/17951 co-relation queries the response was YES. [2021-12-21 15:20:38,211 INFO L84 FinitePrefix]: Finished finitePrefix Result has 16930 conditions, 4102 events. 1421/4102 cut-off events. For 17951/17951 co-relation queries the response was YES. Maximal size of possible extension queue 229. Compared 36168 event pairs, 243 based on Foata normal form. 19/4087 useless extension candidates. Maximal degree in co-relation 15806. Up to 963 conditions per place. [2021-12-21 15:20:38,234 INFO L132 encePairwiseOnDemand]: 66/77 looper letters, 190 selfloop transitions, 268 changer transitions 33/533 dead transitions. [2021-12-21 15:20:38,234 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 212 places, 533 transitions, 5469 flow [2021-12-21 15:20:38,235 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-12-21 15:20:38,235 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2021-12-21 15:20:38,237 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 1355 transitions. [2021-12-21 15:20:38,238 INFO L544 CegarLoopForPetriNet]: DFA transition density 0.7651044607566346 [2021-12-21 15:20:38,238 INFO L72 ComplementDD]: Start complementDD. Operand 23 states and 1355 transitions. [2021-12-21 15:20:38,238 INFO L73 IsDeterministic]: Start isDeterministic. Operand 23 states and 1355 transitions. [2021-12-21 15:20:38,241 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-12-21 15:20:38,241 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 23 states and 1355 transitions. [2021-12-21 15:20:38,246 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 24 states, 23 states have (on average 58.91304347826087) internal successors, (1355), 23 states have internal predecessors, (1355), 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) [2021-12-21 15:20:38,248 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 24 states, 24 states have (on average 77.0) internal successors, (1848), 24 states have internal predecessors, (1848), 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) [2021-12-21 15:20:38,249 INFO L81 ComplementDD]: Finished complementDD. Result has 24 states, 24 states have (on average 77.0) internal successors, (1848), 24 states have internal predecessors, (1848), 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) [2021-12-21 15:20:38,249 INFO L186 Difference]: Start difference. First operand has 190 places, 327 transitions, 2668 flow. Second operand 23 states and 1355 transitions. [2021-12-21 15:20:38,249 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 212 places, 533 transitions, 5469 flow [2021-12-21 15:20:38,334 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 205 places, 533 transitions, 5102 flow, removed 120 selfloop flow, removed 7 redundant places. [2021-12-21 15:20:38,345 INFO L242 Difference]: Finished difference. Result has 215 places, 413 transitions, 4025 flow [2021-12-21 15:20:38,346 INFO L317 CegarLoopForPetriNet]: {PETRI_ALPHABET=77, PETRI_DIFFERENCE_MINUEND_FLOW=2387, PETRI_DIFFERENCE_MINUEND_PLACES=183, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=327, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=186, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=132, PETRI_DIFFERENCE_SUBTRAHEND_STATES=23, PETRI_FLOW=4025, PETRI_PLACES=215, PETRI_TRANSITIONS=413} [2021-12-21 15:20:38,347 INFO L334 CegarLoopForPetriNet]: 68 programPoint places, 147 predicate places. [2021-12-21 15:20:38,347 INFO L470 AbstractCegarLoop]: Abstraction has has 215 places, 413 transitions, 4025 flow [2021-12-21 15:20:38,347 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 55.75) internal successors, (892), 16 states have internal predecessors, (892), 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) [2021-12-21 15:20:38,347 INFO L246 CegarLoopForPetriNet]: Found error trace [2021-12-21 15:20:38,348 INFO L254 CegarLoopForPetriNet]: trace histogram [2, 2, 2, 2, 2, 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] [2021-12-21 15:20:38,373 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-12-21 15:20:38,568 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 15:20:38,569 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr1INUSE_VIOLATION] === [2021-12-21 15:20:38,569 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 15:20:38,569 INFO L85 PathProgramCache]: Analyzing trace with hash 1983759899, now seen corresponding path program 4 times [2021-12-21 15:20:38,569 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 15:20:38,569 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [596230073] [2021-12-21 15:20:38,570 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 15:20:38,570 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 15:20:38,580 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 15:20:38,633 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 15:20:38,634 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 15:20:38,634 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [596230073] [2021-12-21 15:20:38,634 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [596230073] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 15:20:38,634 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1696609067] [2021-12-21 15:20:38,634 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-12-21 15:20:38,634 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 15:20:38,635 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 15:20:38,636 INFO L229 MonitoredProcess]: Starting monitored process 8 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 15:20:38,659 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-12-21 15:20:38,696 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-12-21 15:20:38,696 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 15:20:38,697 INFO L263 TraceCheckSpWp]: Trace formula consists of 141 conjuncts, 8 conjunts are in the unsatisfiable core [2021-12-21 15:20:38,701 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 15:20:38,919 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 1 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 15:20:38,919 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 15:20:39,055 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 15:20:39,055 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1696609067] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 15:20:39,055 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 15:20:39,055 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 18 [2021-12-21 15:20:39,056 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1704355910] [2021-12-21 15:20:39,056 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 15:20:39,056 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-12-21 15:20:39,056 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 15:20:39,057 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-12-21 15:20:39,057 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=251, Unknown=0, NotChecked=0, Total=306 [2021-12-21 15:20:39,058 INFO L499 CegarLoopForPetriNet]: Number of universal loopers: 53 out of 77 [2021-12-21 15:20:39,059 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 215 places, 413 transitions, 4025 flow. Second operand has 18 states, 18 states have (on average 56.111111111111114) internal successors, (1010), 18 states have internal predecessors, (1010), 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) [2021-12-21 15:20:39,059 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-12-21 15:20:39,059 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 53 of 77 [2021-12-21 15:20:39,060 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-12-21 15:20:40,405 INFO L129 PetriNetUnfolder]: 1688/4815 cut-off events. [2021-12-21 15:20:40,406 INFO L130 PetriNetUnfolder]: For 32142/32142 co-relation queries the response was YES. [2021-12-21 15:20:40,430 INFO L84 FinitePrefix]: Finished finitePrefix Result has 22322 conditions, 4815 events. 1688/4815 cut-off events. For 32142/32142 co-relation queries the response was YES. Maximal size of possible extension queue 295. Compared 43903 event pairs, 221 based on Foata normal form. 23/4794 useless extension candidates. Maximal degree in co-relation 21111. Up to 1022 conditions per place. [2021-12-21 15:20:40,497 INFO L132 encePairwiseOnDemand]: 65/77 looper letters, 219 selfloop transitions, 356 changer transitions 4/621 dead transitions. [2021-12-21 15:20:40,498 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 244 places, 621 transitions, 7180 flow [2021-12-21 15:20:40,498 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-12-21 15:20:40,498 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2021-12-21 15:20:40,501 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 1753 transitions. [2021-12-21 15:20:40,502 INFO L544 CegarLoopForPetriNet]: DFA transition density 0.7588744588744589 [2021-12-21 15:20:40,502 INFO L72 ComplementDD]: Start complementDD. Operand 30 states and 1753 transitions. [2021-12-21 15:20:40,502 INFO L73 IsDeterministic]: Start isDeterministic. Operand 30 states and 1753 transitions. [2021-12-21 15:20:40,503 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-12-21 15:20:40,503 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 30 states and 1753 transitions. [2021-12-21 15:20:40,506 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 31 states, 30 states have (on average 58.43333333333333) internal successors, (1753), 30 states have internal predecessors, (1753), 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) [2021-12-21 15:20:40,509 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 31 states, 31 states have (on average 77.0) internal successors, (2387), 31 states have internal predecessors, (2387), 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) [2021-12-21 15:20:40,510 INFO L81 ComplementDD]: Finished complementDD. Result has 31 states, 31 states have (on average 77.0) internal successors, (2387), 31 states have internal predecessors, (2387), 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) [2021-12-21 15:20:40,510 INFO L186 Difference]: Start difference. First operand has 215 places, 413 transitions, 4025 flow. Second operand 30 states and 1753 transitions. [2021-12-21 15:20:40,510 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 244 places, 621 transitions, 7180 flow [2021-12-21 15:20:40,660 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 242 places, 621 transitions, 7127 flow, removed 24 selfloop flow, removed 2 redundant places. [2021-12-21 15:20:40,668 INFO L242 Difference]: Finished difference. Result has 256 places, 512 transitions, 6429 flow [2021-12-21 15:20:40,668 INFO L317 CegarLoopForPetriNet]: {PETRI_ALPHABET=77, PETRI_DIFFERENCE_MINUEND_FLOW=3996, PETRI_DIFFERENCE_MINUEND_PLACES=213, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=413, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=259, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=127, PETRI_DIFFERENCE_SUBTRAHEND_STATES=30, PETRI_FLOW=6429, PETRI_PLACES=256, PETRI_TRANSITIONS=512} [2021-12-21 15:20:40,669 INFO L334 CegarLoopForPetriNet]: 68 programPoint places, 188 predicate places. [2021-12-21 15:20:40,669 INFO L470 AbstractCegarLoop]: Abstraction has has 256 places, 512 transitions, 6429 flow [2021-12-21 15:20:40,669 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 56.111111111111114) internal successors, (1010), 18 states have internal predecessors, (1010), 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) [2021-12-21 15:20:40,670 INFO L246 CegarLoopForPetriNet]: Found error trace [2021-12-21 15:20:40,670 INFO L254 CegarLoopForPetriNet]: trace histogram [2, 2, 2, 2, 2, 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] [2021-12-21 15:20:40,687 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-12-21 15:20:40,870 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,8 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 15:20:40,871 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr1INUSE_VIOLATION] === [2021-12-21 15:20:40,871 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 15:20:40,871 INFO L85 PathProgramCache]: Analyzing trace with hash 1217209175, now seen corresponding path program 5 times [2021-12-21 15:20:40,871 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 15:20:40,872 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [467924079] [2021-12-21 15:20:40,872 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 15:20:40,872 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 15:20:40,881 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 15:20:40,932 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 6 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 15:20:40,932 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 15:20:40,932 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [467924079] [2021-12-21 15:20:40,932 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [467924079] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 15:20:40,932 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1188086043] [2021-12-21 15:20:40,933 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-12-21 15:20:40,933 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 15:20:40,933 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 15:20:40,934 INFO L229 MonitoredProcess]: Starting monitored process 9 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 15:20:40,935 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-12-21 15:20:40,991 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2021-12-21 15:20:40,991 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 15:20:40,992 INFO L263 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 8 conjunts are in the unsatisfiable core [2021-12-21 15:20:40,993 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 15:20:41,146 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 7 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 15:20:41,147 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 15:20:41,257 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 6 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 15:20:41,258 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1188086043] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 15:20:41,258 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 15:20:41,258 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 17 [2021-12-21 15:20:41,258 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1029127981] [2021-12-21 15:20:41,258 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 15:20:41,259 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2021-12-21 15:20:41,259 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 15:20:41,259 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-12-21 15:20:41,260 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=213, Unknown=0, NotChecked=0, Total=272 [2021-12-21 15:20:41,261 INFO L499 CegarLoopForPetriNet]: Number of universal loopers: 53 out of 77 [2021-12-21 15:20:41,261 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 256 places, 512 transitions, 6429 flow. Second operand has 17 states, 17 states have (on average 55.64705882352941) internal successors, (946), 17 states have internal predecessors, (946), 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) [2021-12-21 15:20:41,262 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-12-21 15:20:41,262 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 53 of 77 [2021-12-21 15:20:41,262 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-12-21 15:20:42,938 INFO L129 PetriNetUnfolder]: 2056/6005 cut-off events. [2021-12-21 15:20:42,938 INFO L130 PetriNetUnfolder]: For 63127/63127 co-relation queries the response was YES. [2021-12-21 15:20:42,974 INFO L84 FinitePrefix]: Finished finitePrefix Result has 32168 conditions, 6005 events. 2056/6005 cut-off events. For 63127/63127 co-relation queries the response was YES. Maximal size of possible extension queue 383. Compared 58570 event pairs, 190 based on Foata normal form. 4/5983 useless extension candidates. Maximal degree in co-relation 31845. Up to 791 conditions per place. [2021-12-21 15:20:43,003 INFO L132 encePairwiseOnDemand]: 65/77 looper letters, 342 selfloop transitions, 417 changer transitions 13/814 dead transitions. [2021-12-21 15:20:43,004 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 302 places, 814 transitions, 11197 flow [2021-12-21 15:20:43,004 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2021-12-21 15:20:43,004 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2021-12-21 15:20:43,008 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 2713 transitions. [2021-12-21 15:20:43,009 INFO L544 CegarLoopForPetriNet]: DFA transition density 0.7496546007184305 [2021-12-21 15:20:43,010 INFO L72 ComplementDD]: Start complementDD. Operand 47 states and 2713 transitions. [2021-12-21 15:20:43,010 INFO L73 IsDeterministic]: Start isDeterministic. Operand 47 states and 2713 transitions. [2021-12-21 15:20:43,011 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-12-21 15:20:43,011 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 47 states and 2713 transitions. [2021-12-21 15:20:43,015 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 48 states, 47 states have (on average 57.723404255319146) internal successors, (2713), 47 states have internal predecessors, (2713), 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) [2021-12-21 15:20:43,020 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 48 states, 48 states have (on average 77.0) internal successors, (3696), 48 states have internal predecessors, (3696), 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) [2021-12-21 15:20:43,021 INFO L81 ComplementDD]: Finished complementDD. Result has 48 states, 48 states have (on average 77.0) internal successors, (3696), 48 states have internal predecessors, (3696), 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) [2021-12-21 15:20:43,021 INFO L186 Difference]: Start difference. First operand has 256 places, 512 transitions, 6429 flow. Second operand 47 states and 2713 transitions. [2021-12-21 15:20:43,021 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 302 places, 814 transitions, 11197 flow [2021-12-21 15:20:43,409 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 293 places, 814 transitions, 10756 flow, removed 93 selfloop flow, removed 9 redundant places. [2021-12-21 15:20:43,419 INFO L242 Difference]: Finished difference. Result has 307 places, 657 transitions, 9167 flow [2021-12-21 15:20:43,420 INFO L317 CegarLoopForPetriNet]: {PETRI_ALPHABET=77, PETRI_DIFFERENCE_MINUEND_FLOW=6120, PETRI_DIFFERENCE_MINUEND_PLACES=247, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=512, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=282, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=207, PETRI_DIFFERENCE_SUBTRAHEND_STATES=47, PETRI_FLOW=9167, PETRI_PLACES=307, PETRI_TRANSITIONS=657} [2021-12-21 15:20:43,421 INFO L334 CegarLoopForPetriNet]: 68 programPoint places, 239 predicate places. [2021-12-21 15:20:43,421 INFO L470 AbstractCegarLoop]: Abstraction has has 307 places, 657 transitions, 9167 flow [2021-12-21 15:20:43,422 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 55.64705882352941) internal successors, (946), 17 states have internal predecessors, (946), 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) [2021-12-21 15:20:43,422 INFO L246 CegarLoopForPetriNet]: Found error trace [2021-12-21 15:20:43,422 INFO L254 CegarLoopForPetriNet]: trace histogram [2, 2, 2, 2, 2, 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] [2021-12-21 15:20:43,439 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-12-21 15:20:43,623 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2021-12-21 15:20:43,623 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr1INUSE_VIOLATION] === [2021-12-21 15:20:43,624 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 15:20:43,624 INFO L85 PathProgramCache]: Analyzing trace with hash 118370099, now seen corresponding path program 6 times [2021-12-21 15:20:43,624 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 15:20:43,624 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1891450464] [2021-12-21 15:20:43,624 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 15:20:43,624 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 15:20:43,634 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 15:20:43,690 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 15:20:43,691 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 15:20:43,691 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1891450464] [2021-12-21 15:20:43,691 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1891450464] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 15:20:43,691 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1624654449] [2021-12-21 15:20:43,691 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-12-21 15:20:43,692 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 15:20:43,692 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 15:20:43,693 INFO L229 MonitoredProcess]: Starting monitored process 10 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 15:20:43,694 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-12-21 15:20:43,750 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 2 check-sat command(s) [2021-12-21 15:20:43,750 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 15:20:43,751 INFO L263 TraceCheckSpWp]: Trace formula consists of 151 conjuncts, 8 conjunts are in the unsatisfiable core [2021-12-21 15:20:43,752 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 15:20:43,958 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 1 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 15:20:43,959 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 15:20:44,085 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 15:20:44,086 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1624654449] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 15:20:44,086 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 15:20:44,086 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 18 [2021-12-21 15:20:44,086 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1628932179] [2021-12-21 15:20:44,086 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 15:20:44,086 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-12-21 15:20:44,086 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 15:20:44,087 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-12-21 15:20:44,087 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=252, Unknown=0, NotChecked=0, Total=306 [2021-12-21 15:20:44,088 INFO L499 CegarLoopForPetriNet]: Number of universal loopers: 53 out of 77 [2021-12-21 15:20:44,089 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 307 places, 657 transitions, 9167 flow. Second operand has 18 states, 18 states have (on average 56.111111111111114) internal successors, (1010), 18 states have internal predecessors, (1010), 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) [2021-12-21 15:20:44,089 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-12-21 15:20:44,089 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 53 of 77 [2021-12-21 15:20:44,089 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-12-21 15:20:46,045 INFO L129 PetriNetUnfolder]: 2248/6588 cut-off events. [2021-12-21 15:20:46,045 INFO L130 PetriNetUnfolder]: For 78964/78964 co-relation queries the response was YES. [2021-12-21 15:20:46,095 INFO L84 FinitePrefix]: Finished finitePrefix Result has 38187 conditions, 6588 events. 2248/6588 cut-off events. For 78964/78964 co-relation queries the response was YES. Maximal size of possible extension queue 423. Compared 65877 event pairs, 239 based on Foata normal form. 19/6586 useless extension candidates. Maximal degree in co-relation 37963. Up to 1340 conditions per place. [2021-12-21 15:20:46,132 INFO L132 encePairwiseOnDemand]: 65/77 looper letters, 270 selfloop transitions, 524 changer transitions 3/839 dead transitions. [2021-12-21 15:20:46,132 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 346 places, 839 transitions, 12797 flow [2021-12-21 15:20:46,133 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2021-12-21 15:20:46,133 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2021-12-21 15:20:46,136 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 2368 transitions. [2021-12-21 15:20:46,137 INFO L544 CegarLoopForPetriNet]: DFA transition density 0.7500791891035794 [2021-12-21 15:20:46,137 INFO L72 ComplementDD]: Start complementDD. Operand 41 states and 2368 transitions. [2021-12-21 15:20:46,137 INFO L73 IsDeterministic]: Start isDeterministic. Operand 41 states and 2368 transitions. [2021-12-21 15:20:46,138 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-12-21 15:20:46,138 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 41 states and 2368 transitions. [2021-12-21 15:20:46,142 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 42 states, 41 states have (on average 57.75609756097561) internal successors, (2368), 41 states have internal predecessors, (2368), 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) [2021-12-21 15:20:46,145 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 42 states, 42 states have (on average 77.0) internal successors, (3234), 42 states have internal predecessors, (3234), 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) [2021-12-21 15:20:46,146 INFO L81 ComplementDD]: Finished complementDD. Result has 42 states, 42 states have (on average 77.0) internal successors, (3234), 42 states have internal predecessors, (3234), 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) [2021-12-21 15:20:46,146 INFO L186 Difference]: Start difference. First operand has 307 places, 657 transitions, 9167 flow. Second operand 41 states and 2368 transitions. [2021-12-21 15:20:46,147 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 346 places, 839 transitions, 12797 flow [2021-12-21 15:20:47,106 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 343 places, 839 transitions, 12160 flow, removed 210 selfloop flow, removed 3 redundant places. [2021-12-21 15:20:47,117 INFO L242 Difference]: Finished difference. Result has 352 places, 723 transitions, 11195 flow [2021-12-21 15:20:47,118 INFO L317 CegarLoopForPetriNet]: {PETRI_ALPHABET=77, PETRI_DIFFERENCE_MINUEND_FLOW=8649, PETRI_DIFFERENCE_MINUEND_PLACES=303, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=657, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=459, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=181, PETRI_DIFFERENCE_SUBTRAHEND_STATES=41, PETRI_FLOW=11195, PETRI_PLACES=352, PETRI_TRANSITIONS=723} [2021-12-21 15:20:47,118 INFO L334 CegarLoopForPetriNet]: 68 programPoint places, 284 predicate places. [2021-12-21 15:20:47,118 INFO L470 AbstractCegarLoop]: Abstraction has has 352 places, 723 transitions, 11195 flow [2021-12-21 15:20:47,119 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 56.111111111111114) internal successors, (1010), 18 states have internal predecessors, (1010), 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) [2021-12-21 15:20:47,120 INFO L246 CegarLoopForPetriNet]: Found error trace [2021-12-21 15:20:47,120 INFO L254 CegarLoopForPetriNet]: trace histogram [2, 2, 2, 2, 2, 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] [2021-12-21 15:20:47,143 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-12-21 15:20:47,339 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-12-21 15:20:47,339 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr1INUSE_VIOLATION] === [2021-12-21 15:20:47,339 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 15:20:47,339 INFO L85 PathProgramCache]: Analyzing trace with hash -151736549, now seen corresponding path program 7 times [2021-12-21 15:20:47,340 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 15:20:47,340 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [493239675] [2021-12-21 15:20:47,340 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 15:20:47,340 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 15:20:47,350 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 15:20:47,404 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 15:20:47,404 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 15:20:47,404 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [493239675] [2021-12-21 15:20:47,404 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [493239675] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 15:20:47,405 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [120925634] [2021-12-21 15:20:47,405 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-12-21 15:20:47,405 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 15:20:47,405 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 15:20:47,408 INFO L229 MonitoredProcess]: Starting monitored process 11 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 15:20:47,410 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-12-21 15:20:47,469 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 15:20:47,470 INFO L263 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 8 conjunts are in the unsatisfiable core [2021-12-21 15:20:47,472 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 15:20:47,652 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 3 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 15:20:47,652 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 15:20:47,800 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 15:20:47,800 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [120925634] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 15:20:47,800 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 15:20:47,800 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 17 [2021-12-21 15:20:47,800 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [119792355] [2021-12-21 15:20:47,801 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 15:20:47,801 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2021-12-21 15:20:47,801 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 15:20:47,801 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-12-21 15:20:47,802 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=215, Unknown=0, NotChecked=0, Total=272 [2021-12-21 15:20:47,802 INFO L499 CegarLoopForPetriNet]: Number of universal loopers: 53 out of 77 [2021-12-21 15:20:47,804 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 352 places, 723 transitions, 11195 flow. Second operand has 17 states, 17 states have (on average 55.76470588235294) internal successors, (948), 17 states have internal predecessors, (948), 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) [2021-12-21 15:20:47,804 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-12-21 15:20:47,804 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 53 of 77 [2021-12-21 15:20:47,804 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-12-21 15:20:50,345 INFO L129 PetriNetUnfolder]: 2315/6806 cut-off events. [2021-12-21 15:20:50,345 INFO L130 PetriNetUnfolder]: For 94421/94421 co-relation queries the response was YES. [2021-12-21 15:20:50,385 INFO L84 FinitePrefix]: Finished finitePrefix Result has 40883 conditions, 6806 events. 2315/6806 cut-off events. For 94421/94421 co-relation queries the response was YES. Maximal size of possible extension queue 451. Compared 68521 event pairs, 234 based on Foata normal form. 31/6802 useless extension candidates. Maximal degree in co-relation 40646. Up to 1016 conditions per place. [2021-12-21 15:20:50,414 INFO L132 encePairwiseOnDemand]: 65/77 looper letters, 328 selfloop transitions, 568 changer transitions 28/966 dead transitions. [2021-12-21 15:20:50,415 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 418 places, 966 transitions, 15569 flow [2021-12-21 15:20:50,415 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 68 states. [2021-12-21 15:20:50,415 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 68 states. [2021-12-21 15:20:50,421 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 3914 transitions. [2021-12-21 15:20:50,422 INFO L544 CegarLoopForPetriNet]: DFA transition density 0.7475171886936592 [2021-12-21 15:20:50,422 INFO L72 ComplementDD]: Start complementDD. Operand 68 states and 3914 transitions. [2021-12-21 15:20:50,423 INFO L73 IsDeterministic]: Start isDeterministic. Operand 68 states and 3914 transitions. [2021-12-21 15:20:50,424 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-12-21 15:20:50,424 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 68 states and 3914 transitions. [2021-12-21 15:20:50,429 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 69 states, 68 states have (on average 57.55882352941177) internal successors, (3914), 68 states have internal predecessors, (3914), 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) [2021-12-21 15:20:50,438 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 69 states, 69 states have (on average 77.0) internal successors, (5313), 69 states have internal predecessors, (5313), 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) [2021-12-21 15:20:50,439 INFO L81 ComplementDD]: Finished complementDD. Result has 69 states, 69 states have (on average 77.0) internal successors, (5313), 69 states have internal predecessors, (5313), 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) [2021-12-21 15:20:50,439 INFO L186 Difference]: Start difference. First operand has 352 places, 723 transitions, 11195 flow. Second operand 68 states and 3914 transitions. [2021-12-21 15:20:50,439 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 418 places, 966 transitions, 15569 flow [2021-12-21 15:20:51,195 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 393 places, 966 transitions, 15038 flow, removed 83 selfloop flow, removed 25 redundant places. [2021-12-21 15:20:51,209 INFO L242 Difference]: Finished difference. Result has 403 places, 772 transitions, 13155 flow [2021-12-21 15:20:51,210 INFO L317 CegarLoopForPetriNet]: {PETRI_ALPHABET=77, PETRI_DIFFERENCE_MINUEND_FLOW=10686, PETRI_DIFFERENCE_MINUEND_PLACES=326, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=720, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=515, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=188, PETRI_DIFFERENCE_SUBTRAHEND_STATES=68, PETRI_FLOW=13155, PETRI_PLACES=403, PETRI_TRANSITIONS=772} [2021-12-21 15:20:51,210 INFO L334 CegarLoopForPetriNet]: 68 programPoint places, 335 predicate places. [2021-12-21 15:20:51,210 INFO L470 AbstractCegarLoop]: Abstraction has has 403 places, 772 transitions, 13155 flow [2021-12-21 15:20:51,210 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 55.76470588235294) internal successors, (948), 17 states have internal predecessors, (948), 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) [2021-12-21 15:20:51,211 INFO L246 CegarLoopForPetriNet]: Found error trace [2021-12-21 15:20:51,211 INFO L254 CegarLoopForPetriNet]: trace histogram [2, 2, 2, 2, 2, 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] [2021-12-21 15:20:51,232 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Ended with exit code 0 [2021-12-21 15:20:51,425 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-12-21 15:20:51,425 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr1INUSE_VIOLATION] === [2021-12-21 15:20:51,426 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 15:20:51,426 INFO L85 PathProgramCache]: Analyzing trace with hash -981160703, now seen corresponding path program 8 times [2021-12-21 15:20:51,426 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 15:20:51,426 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [576116166] [2021-12-21 15:20:51,426 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 15:20:51,426 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 15:20:51,440 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 15:20:51,498 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 6 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 15:20:51,498 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 15:20:51,498 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [576116166] [2021-12-21 15:20:51,498 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [576116166] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 15:20:51,498 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1265790551] [2021-12-21 15:20:51,499 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-21 15:20:51,499 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 15:20:51,499 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 15:20:51,500 INFO L229 MonitoredProcess]: Starting monitored process 12 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 15:20:51,501 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-12-21 15:20:51,572 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-21 15:20:51,572 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 15:20:51,573 INFO L263 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 8 conjunts are in the unsatisfiable core [2021-12-21 15:20:51,574 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 15:20:51,748 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 7 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 15:20:51,748 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 15:20:51,891 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 6 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 15:20:51,891 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1265790551] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 15:20:51,891 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 15:20:51,891 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 20 [2021-12-21 15:20:51,891 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1361721816] [2021-12-21 15:20:51,891 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 15:20:51,892 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2021-12-21 15:20:51,892 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 15:20:51,892 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-12-21 15:20:51,893 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=309, Unknown=0, NotChecked=0, Total=380 [2021-12-21 15:20:51,893 INFO L499 CegarLoopForPetriNet]: Number of universal loopers: 53 out of 77 [2021-12-21 15:20:51,894 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 403 places, 772 transitions, 13155 flow. Second operand has 20 states, 20 states have (on average 55.4) internal successors, (1108), 20 states have internal predecessors, (1108), 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) [2021-12-21 15:20:51,895 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-12-21 15:20:51,895 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 53 of 77 [2021-12-21 15:20:51,895 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-12-21 15:20:53,951 INFO L129 PetriNetUnfolder]: 2327/6841 cut-off events. [2021-12-21 15:20:53,951 INFO L130 PetriNetUnfolder]: For 108630/108630 co-relation queries the response was YES. [2021-12-21 15:20:53,999 INFO L84 FinitePrefix]: Finished finitePrefix Result has 43399 conditions, 6841 events. 2327/6841 cut-off events. For 108630/108630 co-relation queries the response was YES. Maximal size of possible extension queue 451. Compared 68847 event pairs, 657 based on Foata normal form. 1/6744 useless extension candidates. Maximal degree in co-relation 43150. Up to 2226 conditions per place. [2021-12-21 15:20:54,032 INFO L132 encePairwiseOnDemand]: 66/77 looper letters, 549 selfloop transitions, 245 changer transitions 8/844 dead transitions. [2021-12-21 15:20:54,032 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 425 places, 844 transitions, 15539 flow [2021-12-21 15:20:54,033 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-12-21 15:20:54,033 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2021-12-21 15:20:54,034 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 1386 transitions. [2021-12-21 15:20:54,035 INFO L544 CegarLoopForPetriNet]: DFA transition density 0.75 [2021-12-21 15:20:54,035 INFO L72 ComplementDD]: Start complementDD. Operand 24 states and 1386 transitions. [2021-12-21 15:20:54,035 INFO L73 IsDeterministic]: Start isDeterministic. Operand 24 states and 1386 transitions. [2021-12-21 15:20:54,035 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-12-21 15:20:54,036 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 24 states and 1386 transitions. [2021-12-21 15:20:54,037 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 25 states, 24 states have (on average 57.75) internal successors, (1386), 24 states have internal predecessors, (1386), 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) [2021-12-21 15:20:54,039 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 25 states, 25 states have (on average 77.0) internal successors, (1925), 25 states have internal predecessors, (1925), 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) [2021-12-21 15:20:54,040 INFO L81 ComplementDD]: Finished complementDD. Result has 25 states, 25 states have (on average 77.0) internal successors, (1925), 25 states have internal predecessors, (1925), 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) [2021-12-21 15:20:54,040 INFO L186 Difference]: Start difference. First operand has 403 places, 772 transitions, 13155 flow. Second operand 24 states and 1386 transitions. [2021-12-21 15:20:54,040 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 425 places, 844 transitions, 15539 flow [2021-12-21 15:20:54,941 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 395 places, 844 transitions, 15071 flow, removed 76 selfloop flow, removed 30 redundant places. [2021-12-21 15:20:54,956 INFO L242 Difference]: Finished difference. Result has 405 places, 791 transitions, 13538 flow [2021-12-21 15:20:54,957 INFO L317 CegarLoopForPetriNet]: {PETRI_ALPHABET=77, PETRI_DIFFERENCE_MINUEND_FLOW=12707, PETRI_DIFFERENCE_MINUEND_PLACES=372, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=772, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=226, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=538, PETRI_DIFFERENCE_SUBTRAHEND_STATES=24, PETRI_FLOW=13538, PETRI_PLACES=405, PETRI_TRANSITIONS=791} [2021-12-21 15:20:54,957 INFO L334 CegarLoopForPetriNet]: 68 programPoint places, 337 predicate places. [2021-12-21 15:20:54,958 INFO L470 AbstractCegarLoop]: Abstraction has has 405 places, 791 transitions, 13538 flow [2021-12-21 15:20:54,958 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 55.4) internal successors, (1108), 20 states have internal predecessors, (1108), 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) [2021-12-21 15:20:54,958 INFO L246 CegarLoopForPetriNet]: Found error trace [2021-12-21 15:20:54,958 INFO L254 CegarLoopForPetriNet]: trace histogram [2, 2, 2, 2, 2, 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] [2021-12-21 15:20:54,985 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-12-21 15:20:55,171 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-12-21 15:20:55,171 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr1INUSE_VIOLATION] === [2021-12-21 15:20:55,172 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 15:20:55,172 INFO L85 PathProgramCache]: Analyzing trace with hash 331168385, now seen corresponding path program 9 times [2021-12-21 15:20:55,172 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 15:20:55,172 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1556043040] [2021-12-21 15:20:55,172 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 15:20:55,172 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 15:20:55,186 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 15:20:55,246 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 15:20:55,247 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 15:20:55,247 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1556043040] [2021-12-21 15:20:55,247 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1556043040] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 15:20:55,247 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [923692734] [2021-12-21 15:20:55,247 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-12-21 15:20:55,248 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 15:20:55,248 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 15:20:55,249 INFO L229 MonitoredProcess]: Starting monitored process 13 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 15:20:55,251 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-12-21 15:20:55,309 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-12-21 15:20:55,310 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 15:20:55,311 INFO L263 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 8 conjunts are in the unsatisfiable core [2021-12-21 15:20:55,312 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 15:20:55,510 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 3 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 15:20:55,511 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 15:20:55,637 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 15:20:55,637 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [923692734] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 15:20:55,637 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 15:20:55,637 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 19 [2021-12-21 15:20:55,637 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1437623224] [2021-12-21 15:20:55,638 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 15:20:55,638 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2021-12-21 15:20:55,638 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 15:20:55,638 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-12-21 15:20:55,638 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=64, Invalid=278, Unknown=0, NotChecked=0, Total=342 [2021-12-21 15:20:55,639 INFO L499 CegarLoopForPetriNet]: Number of universal loopers: 53 out of 77 [2021-12-21 15:20:55,640 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 405 places, 791 transitions, 13538 flow. Second operand has 19 states, 19 states have (on average 55.68421052631579) internal successors, (1058), 19 states have internal predecessors, (1058), 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) [2021-12-21 15:20:55,640 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-12-21 15:20:55,640 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 53 of 77 [2021-12-21 15:20:55,640 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-12-21 15:20:59,389 INFO L129 PetriNetUnfolder]: 3673/10200 cut-off events. [2021-12-21 15:20:59,389 INFO L130 PetriNetUnfolder]: For 187722/187722 co-relation queries the response was YES. [2021-12-21 15:20:59,470 INFO L84 FinitePrefix]: Finished finitePrefix Result has 68587 conditions, 10200 events. 3673/10200 cut-off events. For 187722/187722 co-relation queries the response was YES. Maximal size of possible extension queue 686. Compared 107773 event pairs, 564 based on Foata normal form. 30/10127 useless extension candidates. Maximal degree in co-relation 68395. Up to 1978 conditions per place. [2021-12-21 15:20:59,508 INFO L132 encePairwiseOnDemand]: 65/77 looper letters, 488 selfloop transitions, 889 changer transitions 17/1436 dead transitions. [2021-12-21 15:20:59,508 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 470 places, 1436 transitions, 27257 flow [2021-12-21 15:20:59,510 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 69 states. [2021-12-21 15:20:59,510 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 69 states. [2021-12-21 15:20:59,513 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 3930 transitions. [2021-12-21 15:20:59,514 INFO L544 CegarLoopForPetriNet]: DFA transition density 0.7396950875211745 [2021-12-21 15:20:59,515 INFO L72 ComplementDD]: Start complementDD. Operand 69 states and 3930 transitions. [2021-12-21 15:20:59,515 INFO L73 IsDeterministic]: Start isDeterministic. Operand 69 states and 3930 transitions. [2021-12-21 15:20:59,516 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-12-21 15:20:59,516 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 69 states and 3930 transitions. [2021-12-21 15:20:59,521 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 70 states, 69 states have (on average 56.95652173913044) internal successors, (3930), 69 states have internal predecessors, (3930), 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) [2021-12-21 15:20:59,526 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 70 states, 70 states have (on average 77.0) internal successors, (5390), 70 states have internal predecessors, (5390), 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) [2021-12-21 15:20:59,527 INFO L81 ComplementDD]: Finished complementDD. Result has 70 states, 70 states have (on average 77.0) internal successors, (5390), 70 states have internal predecessors, (5390), 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) [2021-12-21 15:20:59,527 INFO L186 Difference]: Start difference. First operand has 405 places, 791 transitions, 13538 flow. Second operand 69 states and 3930 transitions. [2021-12-21 15:20:59,527 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 470 places, 1436 transitions, 27257 flow [2021-12-21 15:21:00,962 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 466 places, 1436 transitions, 26808 flow, removed 20 selfloop flow, removed 4 redundant places. [2021-12-21 15:21:00,984 INFO L242 Difference]: Finished difference. Result has 485 places, 1194 transitions, 24458 flow [2021-12-21 15:21:00,984 INFO L317 CegarLoopForPetriNet]: {PETRI_ALPHABET=77, PETRI_DIFFERENCE_MINUEND_FLOW=13291, PETRI_DIFFERENCE_MINUEND_PLACES=398, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=791, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=505, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=234, PETRI_DIFFERENCE_SUBTRAHEND_STATES=69, PETRI_FLOW=24458, PETRI_PLACES=485, PETRI_TRANSITIONS=1194} [2021-12-21 15:21:00,985 INFO L334 CegarLoopForPetriNet]: 68 programPoint places, 417 predicate places. [2021-12-21 15:21:00,985 INFO L470 AbstractCegarLoop]: Abstraction has has 485 places, 1194 transitions, 24458 flow [2021-12-21 15:21:00,985 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 55.68421052631579) internal successors, (1058), 19 states have internal predecessors, (1058), 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) [2021-12-21 15:21:00,985 INFO L246 CegarLoopForPetriNet]: Found error trace [2021-12-21 15:21:00,986 INFO L254 CegarLoopForPetriNet]: trace histogram [2, 2, 2, 2, 2, 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] [2021-12-21 15:21:01,009 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-12-21 15:21:01,199 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-12-21 15:21:01,199 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr1INUSE_VIOLATION] === [2021-12-21 15:21:01,200 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 15:21:01,200 INFO L85 PathProgramCache]: Analyzing trace with hash -838217509, now seen corresponding path program 10 times [2021-12-21 15:21:01,200 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 15:21:01,200 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1811888620] [2021-12-21 15:21:01,200 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 15:21:01,200 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 15:21:01,215 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 15:21:01,283 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 15:21:01,283 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 15:21:01,283 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1811888620] [2021-12-21 15:21:01,283 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1811888620] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 15:21:01,283 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1543344486] [2021-12-21 15:21:01,284 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-12-21 15:21:01,284 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 15:21:01,284 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 15:21:01,285 INFO L229 MonitoredProcess]: Starting monitored process 14 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 15:21:01,286 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-12-21 15:21:01,340 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-12-21 15:21:01,340 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 15:21:01,341 INFO L263 TraceCheckSpWp]: Trace formula consists of 141 conjuncts, 8 conjunts are in the unsatisfiable core [2021-12-21 15:21:01,342 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 15:21:01,553 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 1 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 15:21:01,553 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 15:21:01,664 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 15:21:01,664 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1543344486] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 15:21:01,664 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 15:21:01,665 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 19 [2021-12-21 15:21:01,665 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2092379013] [2021-12-21 15:21:01,665 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 15:21:01,665 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2021-12-21 15:21:01,665 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 15:21:01,666 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-12-21 15:21:01,666 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=285, Unknown=0, NotChecked=0, Total=342 [2021-12-21 15:21:01,666 INFO L499 CegarLoopForPetriNet]: Number of universal loopers: 53 out of 77 [2021-12-21 15:21:01,667 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 485 places, 1194 transitions, 24458 flow. Second operand has 19 states, 19 states have (on average 55.73684210526316) internal successors, (1059), 19 states have internal predecessors, (1059), 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) [2021-12-21 15:21:01,667 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-12-21 15:21:01,668 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 53 of 77 [2021-12-21 15:21:01,668 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-12-21 15:21:09,144 INFO L129 PetriNetUnfolder]: 6250/17016 cut-off events. [2021-12-21 15:21:09,144 INFO L130 PetriNetUnfolder]: For 440564/440564 co-relation queries the response was YES. [2021-12-21 15:21:09,399 INFO L84 FinitePrefix]: Finished finitePrefix Result has 130530 conditions, 17016 events. 6250/17016 cut-off events. For 440564/440564 co-relation queries the response was YES. Maximal size of possible extension queue 1179. Compared 195108 event pairs, 817 based on Foata normal form. 45/16917 useless extension candidates. Maximal degree in co-relation 129212. Up to 2737 conditions per place. [2021-12-21 15:21:09,494 INFO L132 encePairwiseOnDemand]: 65/77 looper letters, 663 selfloop transitions, 1697 changer transitions 31/2433 dead transitions. [2021-12-21 15:21:09,494 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 570 places, 2433 transitions, 54424 flow [2021-12-21 15:21:09,494 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 86 states. [2021-12-21 15:21:09,495 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 86 states. [2021-12-21 15:21:09,497 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 4916 transitions. [2021-12-21 15:21:09,498 INFO L544 CegarLoopForPetriNet]: DFA transition density 0.7423739051646029 [2021-12-21 15:21:09,499 INFO L72 ComplementDD]: Start complementDD. Operand 86 states and 4916 transitions. [2021-12-21 15:21:09,499 INFO L73 IsDeterministic]: Start isDeterministic. Operand 86 states and 4916 transitions. [2021-12-21 15:21:09,501 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-12-21 15:21:09,501 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 86 states and 4916 transitions. [2021-12-21 15:21:09,508 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 87 states, 86 states have (on average 57.16279069767442) internal successors, (4916), 86 states have internal predecessors, (4916), 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) [2021-12-21 15:21:09,516 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 87 states, 87 states have (on average 77.0) internal successors, (6699), 87 states have internal predecessors, (6699), 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) [2021-12-21 15:21:09,517 INFO L81 ComplementDD]: Finished complementDD. Result has 87 states, 87 states have (on average 77.0) internal successors, (6699), 87 states have internal predecessors, (6699), 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) [2021-12-21 15:21:09,517 INFO L186 Difference]: Start difference. First operand has 485 places, 1194 transitions, 24458 flow. Second operand 86 states and 4916 transitions. [2021-12-21 15:21:09,517 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 570 places, 2433 transitions, 54424 flow [2021-12-21 15:21:15,404 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 534 places, 2433 transitions, 53393 flow, removed 77 selfloop flow, removed 36 redundant places. [2021-12-21 15:21:15,447 INFO L242 Difference]: Finished difference. Result has 556 places, 2081 transitions, 50135 flow [2021-12-21 15:21:15,448 INFO L317 CegarLoopForPetriNet]: {PETRI_ALPHABET=77, PETRI_DIFFERENCE_MINUEND_FLOW=23792, PETRI_DIFFERENCE_MINUEND_PLACES=449, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=1194, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=865, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=232, PETRI_DIFFERENCE_SUBTRAHEND_STATES=86, PETRI_FLOW=50135, PETRI_PLACES=556, PETRI_TRANSITIONS=2081} [2021-12-21 15:21:15,448 INFO L334 CegarLoopForPetriNet]: 68 programPoint places, 488 predicate places. [2021-12-21 15:21:15,449 INFO L470 AbstractCegarLoop]: Abstraction has has 556 places, 2081 transitions, 50135 flow [2021-12-21 15:21:15,449 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 55.73684210526316) internal successors, (1059), 19 states have internal predecessors, (1059), 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) [2021-12-21 15:21:15,449 INFO L246 CegarLoopForPetriNet]: Found error trace [2021-12-21 15:21:15,449 INFO L254 CegarLoopForPetriNet]: trace histogram [2, 2, 2, 2, 2, 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] [2021-12-21 15:21:15,465 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Ended with exit code 0 [2021-12-21 15:21:15,649 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-12-21 15:21:15,650 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr1INUSE_VIOLATION] === [2021-12-21 15:21:15,650 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 15:21:15,650 INFO L85 PathProgramCache]: Analyzing trace with hash -1400475587, now seen corresponding path program 11 times [2021-12-21 15:21:15,650 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 15:21:15,650 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1551402393] [2021-12-21 15:21:15,650 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 15:21:15,650 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 15:21:15,658 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 15:21:15,709 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 6 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 15:21:15,710 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 15:21:15,710 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1551402393] [2021-12-21 15:21:15,710 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1551402393] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 15:21:15,710 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [406262475] [2021-12-21 15:21:15,710 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-12-21 15:21:15,710 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 15:21:15,710 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 15:21:15,711 INFO L229 MonitoredProcess]: Starting monitored process 15 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 15:21:15,712 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-12-21 15:21:15,767 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2021-12-21 15:21:15,768 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 15:21:15,768 INFO L263 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 8 conjunts are in the unsatisfiable core [2021-12-21 15:21:15,770 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 15:21:15,919 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 7 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 15:21:15,919 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 15:21:16,019 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 6 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 15:21:16,019 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [406262475] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 15:21:16,019 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 15:21:16,020 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 19 [2021-12-21 15:21:16,020 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [574861368] [2021-12-21 15:21:16,020 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 15:21:16,020 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2021-12-21 15:21:16,021 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 15:21:16,021 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-12-21 15:21:16,021 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=277, Unknown=0, NotChecked=0, Total=342 [2021-12-21 15:21:16,022 INFO L499 CegarLoopForPetriNet]: Number of universal loopers: 53 out of 77 [2021-12-21 15:21:16,023 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 556 places, 2081 transitions, 50135 flow. Second operand has 19 states, 19 states have (on average 55.421052631578945) internal successors, (1053), 19 states have internal predecessors, (1053), 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) [2021-12-21 15:21:16,023 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-12-21 15:21:16,023 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 53 of 77 [2021-12-21 15:21:16,023 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-12-21 15:21:27,150 INFO L129 PetriNetUnfolder]: 6307/17364 cut-off events. [2021-12-21 15:21:27,151 INFO L130 PetriNetUnfolder]: For 577168/577168 co-relation queries the response was YES. [2021-12-21 15:21:27,495 INFO L84 FinitePrefix]: Finished finitePrefix Result has 146449 conditions, 17364 events. 6307/17364 cut-off events. For 577168/577168 co-relation queries the response was YES. Maximal size of possible extension queue 1217. Compared 201459 event pairs, 839 based on Foata normal form. 7/17209 useless extension candidates. Maximal degree in co-relation 145139. Up to 3276 conditions per place. [2021-12-21 15:21:27,583 INFO L132 encePairwiseOnDemand]: 65/77 looper letters, 989 selfloop transitions, 1260 changer transitions 18/2309 dead transitions. [2021-12-21 15:21:27,583 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 605 places, 2309 transitions, 58283 flow [2021-12-21 15:21:27,584 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2021-12-21 15:21:27,584 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2021-12-21 15:21:27,585 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 2887 transitions. [2021-12-21 15:21:27,585 INFO L544 CegarLoopForPetriNet]: DFA transition density 0.7498701298701299 [2021-12-21 15:21:27,586 INFO L72 ComplementDD]: Start complementDD. Operand 50 states and 2887 transitions. [2021-12-21 15:21:27,586 INFO L73 IsDeterministic]: Start isDeterministic. Operand 50 states and 2887 transitions. [2021-12-21 15:21:27,586 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-12-21 15:21:27,586 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 50 states and 2887 transitions. [2021-12-21 15:21:27,589 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 51 states, 50 states have (on average 57.74) internal successors, (2887), 50 states have internal predecessors, (2887), 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) [2021-12-21 15:21:27,592 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 51 states, 51 states have (on average 77.0) internal successors, (3927), 51 states have internal predecessors, (3927), 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) [2021-12-21 15:21:27,593 INFO L81 ComplementDD]: Finished complementDD. Result has 51 states, 51 states have (on average 77.0) internal successors, (3927), 51 states have internal predecessors, (3927), 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) [2021-12-21 15:21:27,593 INFO L186 Difference]: Start difference. First operand has 556 places, 2081 transitions, 50135 flow. Second operand 50 states and 2887 transitions. [2021-12-21 15:21:27,594 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 605 places, 2309 transitions, 58283 flow