./Ultimate.py --spec ../sv-benchmarks/c/properties/unreach-call.prp --file ../sv-benchmarks/c/weaver/popl20-nonblocking-cntr.wvr.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 839c364b 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-nonblocking-cntr.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 c17307c3ae663be4a153b702602dea6d5ee45f14a080e7a1fb720e97140b770f --- Real Ultimate output --- This is Ultimate 0.2.2-839c364b5d67a0f615c82cb70ab247790648d4a9-839c364 [2021-12-14 16:54:29,872 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-12-14 16:54:29,873 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-12-14 16:54:29,908 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-12-14 16:54:29,908 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-12-14 16:54:29,911 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-12-14 16:54:29,912 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-12-14 16:54:29,914 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-12-14 16:54:29,915 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-12-14 16:54:29,918 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-12-14 16:54:29,919 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-12-14 16:54:29,920 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-12-14 16:54:29,920 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-12-14 16:54:29,922 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-12-14 16:54:29,923 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-12-14 16:54:29,926 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-12-14 16:54:29,927 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-12-14 16:54:29,927 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-12-14 16:54:29,929 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-12-14 16:54:29,933 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-12-14 16:54:29,934 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-12-14 16:54:29,934 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-12-14 16:54:29,936 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-12-14 16:54:29,936 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-12-14 16:54:29,940 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-12-14 16:54:29,941 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-12-14 16:54:29,941 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-12-14 16:54:29,942 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-12-14 16:54:29,942 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-12-14 16:54:29,943 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-12-14 16:54:29,943 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-12-14 16:54:29,943 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-12-14 16:54:29,944 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-12-14 16:54:29,945 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-12-14 16:54:29,947 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-12-14 16:54:29,947 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-12-14 16:54:29,947 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-12-14 16:54:29,947 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-12-14 16:54:29,947 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-12-14 16:54:29,948 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-12-14 16:54:29,948 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-12-14 16:54:29,950 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Default.epf [2021-12-14 16:54:29,972 INFO L113 SettingsManager]: Loading preferences was successful [2021-12-14 16:54:29,973 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-12-14 16:54:29,973 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-12-14 16:54:29,973 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-12-14 16:54:29,974 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-12-14 16:54:29,974 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-12-14 16:54:29,975 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-12-14 16:54:29,975 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-12-14 16:54:29,975 INFO L138 SettingsManager]: * Use SBE=true [2021-12-14 16:54:29,975 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-12-14 16:54:29,976 INFO L138 SettingsManager]: * sizeof long=4 [2021-12-14 16:54:29,976 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-12-14 16:54:29,976 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-12-14 16:54:29,976 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-12-14 16:54:29,976 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-12-14 16:54:29,976 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-12-14 16:54:29,977 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-12-14 16:54:29,977 INFO L138 SettingsManager]: * sizeof long double=12 [2021-12-14 16:54:29,977 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-12-14 16:54:29,977 INFO L138 SettingsManager]: * Use constant arrays=true [2021-12-14 16:54:29,977 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-12-14 16:54:29,977 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-12-14 16:54:29,977 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-12-14 16:54:29,977 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-12-14 16:54:29,978 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-12-14 16:54:29,978 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-12-14 16:54:29,978 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-12-14 16:54:29,979 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-12-14 16:54:29,979 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-12-14 16:54:29,979 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-12-14 16:54:29,979 INFO L138 SettingsManager]: * Large block encoding in concurrent analysis=OFF [2021-12-14 16:54:29,980 INFO L138 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2021-12-14 16:54:29,980 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-12-14 16:54:29,980 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-12-14 16:54:29,980 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> c17307c3ae663be4a153b702602dea6d5ee45f14a080e7a1fb720e97140b770f [2021-12-14 16:54:30,200 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-12-14 16:54:30,220 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-12-14 16:54:30,222 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-12-14 16:54:30,223 INFO L271 PluginConnector]: Initializing CDTParser... [2021-12-14 16:54:30,223 INFO L275 PluginConnector]: CDTParser initialized [2021-12-14 16:54:30,224 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/weaver/popl20-nonblocking-cntr.wvr.c [2021-12-14 16:54:30,281 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/08c6572fa/4b9edd2eba7a465cb543a6e433c06672/FLAGc64aa96e5 [2021-12-14 16:54:30,636 INFO L306 CDTParser]: Found 1 translation units. [2021-12-14 16:54:30,637 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/weaver/popl20-nonblocking-cntr.wvr.c [2021-12-14 16:54:30,641 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/08c6572fa/4b9edd2eba7a465cb543a6e433c06672/FLAGc64aa96e5 [2021-12-14 16:54:30,649 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/08c6572fa/4b9edd2eba7a465cb543a6e433c06672 [2021-12-14 16:54:30,651 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-12-14 16:54:30,652 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-12-14 16:54:30,653 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-12-14 16:54:30,653 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-12-14 16:54:30,655 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-12-14 16:54:30,655 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.12 04:54:30" (1/1) ... [2021-12-14 16:54:30,656 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@191a3146 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 04:54:30, skipping insertion in model container [2021-12-14 16:54:30,656 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.12 04:54:30" (1/1) ... [2021-12-14 16:54:30,660 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-12-14 16:54:30,669 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-12-14 16:54:30,780 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-nonblocking-cntr.wvr.c[2037,2050] [2021-12-14 16:54:30,783 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-12-14 16:54:30,793 INFO L203 MainTranslator]: Completed pre-run [2021-12-14 16:54:30,820 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-nonblocking-cntr.wvr.c[2037,2050] [2021-12-14 16:54:30,826 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-12-14 16:54:30,837 INFO L208 MainTranslator]: Completed translation [2021-12-14 16:54:30,837 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 04:54:30 WrapperNode [2021-12-14 16:54:30,837 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-12-14 16:54:30,838 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-12-14 16:54:30,838 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-12-14 16:54:30,839 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-12-14 16:54:30,844 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 04:54:30" (1/1) ... [2021-12-14 16:54:30,851 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 04:54:30" (1/1) ... [2021-12-14 16:54:30,871 INFO L137 Inliner]: procedures = 21, calls = 24, calls flagged for inlining = 4, calls inlined = 4, statements flattened = 53 [2021-12-14 16:54:30,871 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-12-14 16:54:30,872 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-12-14 16:54:30,872 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-12-14 16:54:30,872 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-12-14 16:54:30,877 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 04:54:30" (1/1) ... [2021-12-14 16:54:30,878 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 04:54:30" (1/1) ... [2021-12-14 16:54:30,888 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 04:54:30" (1/1) ... [2021-12-14 16:54:30,888 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 04:54:30" (1/1) ... [2021-12-14 16:54:30,895 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 04:54:30" (1/1) ... [2021-12-14 16:54:30,902 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 04:54:30" (1/1) ... [2021-12-14 16:54:30,904 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 04:54:30" (1/1) ... [2021-12-14 16:54:30,907 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-12-14 16:54:30,908 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-12-14 16:54:30,908 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-12-14 16:54:30,908 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-12-14 16:54:30,909 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 04:54:30" (1/1) ... [2021-12-14 16:54:30,915 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-12-14 16:54:30,924 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-14 16:54:30,936 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) [2021-12-14 16:54:30,943 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 [2021-12-14 16:54:30,968 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-12-14 16:54:30,968 INFO L130 BoogieDeclarations]: Found specification of procedure thread1 [2021-12-14 16:54:30,968 INFO L138 BoogieDeclarations]: Found implementation of procedure thread1 [2021-12-14 16:54:30,969 INFO L130 BoogieDeclarations]: Found specification of procedure thread2 [2021-12-14 16:54:30,969 INFO L138 BoogieDeclarations]: Found implementation of procedure thread2 [2021-12-14 16:54:30,969 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-12-14 16:54:30,969 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-12-14 16:54:30,972 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-12-14 16:54:30,972 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_atomic_end [2021-12-14 16:54:30,972 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_atomic_begin [2021-12-14 16:54:30,972 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-12-14 16:54:30,973 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-12-14 16:54:30,973 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-12-14 16:54:30,973 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-12-14 16:54:30,974 WARN L209 CfgBuilder]: User set CodeBlockSize to SequenceOfStatements but program contains fork statements. Overwriting the user preferences and setting CodeBlockSize to SingleStatement [2021-12-14 16:54:31,037 INFO L236 CfgBuilder]: Building ICFG [2021-12-14 16:54:31,039 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-12-14 16:54:31,185 INFO L277 CfgBuilder]: Performing block encoding [2021-12-14 16:54:31,211 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-12-14 16:54:31,211 INFO L301 CfgBuilder]: Removed 2 assume(true) statements. [2021-12-14 16:54:31,213 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.12 04:54:31 BoogieIcfgContainer [2021-12-14 16:54:31,213 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-12-14 16:54:31,214 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-12-14 16:54:31,214 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-12-14 16:54:31,216 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-12-14 16:54:31,216 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 14.12 04:54:30" (1/3) ... [2021-12-14 16:54:31,217 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@532db45e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.12 04:54:31, skipping insertion in model container [2021-12-14 16:54:31,217 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 04:54:30" (2/3) ... [2021-12-14 16:54:31,217 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@532db45e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.12 04:54:31, skipping insertion in model container [2021-12-14 16:54:31,217 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.12 04:54:31" (3/3) ... [2021-12-14 16:54:31,218 INFO L111 eAbstractionObserver]: Analyzing ICFG popl20-nonblocking-cntr.wvr.c [2021-12-14 16:54:31,221 WARN L149 ceAbstractionStarter]: Switching off computation of Hoare annotation because input is a concurrent program [2021-12-14 16:54:31,222 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-12-14 16:54:31,222 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-12-14 16:54:31,222 INFO L513 ceAbstractionStarter]: Constructing petrified ICFG for 1 thread instances. [2021-12-14 16:54:31,239 WARN L322 ript$VariableManager]: TermVariabe thread1Thread1of1ForFork0_~i~0 not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-12-14 16:54:31,239 WARN L322 ript$VariableManager]: TermVariabe thread1Thread1of1ForFork0_~i~0 not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-12-14 16:54:31,240 WARN L322 ript$VariableManager]: TermVariabe thread1Thread1of1ForFork0_~i~0 not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-12-14 16:54:31,240 WARN L322 ript$VariableManager]: TermVariabe thread1Thread1of1ForFork0_~i~0 not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-12-14 16:54:31,240 WARN L322 ript$VariableManager]: TermVariabe thread1Thread1of1ForFork0_~i~0 not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-12-14 16:54:31,240 WARN L322 ript$VariableManager]: TermVariabe thread1Thread1of1ForFork0_~i~0 not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-12-14 16:54:31,240 WARN L322 ript$VariableManager]: TermVariabe |thread1Thread1of1ForFork0_#res.base| not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-12-14 16:54:31,240 WARN L322 ript$VariableManager]: TermVariabe |thread1Thread1of1ForFork0_#res.offset| not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-12-14 16:54:31,241 WARN L322 ript$VariableManager]: TermVariabe |thread1Thread1of1ForFork0_#res.base| not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-12-14 16:54:31,241 WARN L322 ript$VariableManager]: TermVariabe |thread1Thread1of1ForFork0_#res.offset| not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-12-14 16:54:31,241 WARN L322 ript$VariableManager]: TermVariabe |thread1Thread1of1ForFork0_#t~post2| not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-12-14 16:54:31,241 WARN L322 ript$VariableManager]: TermVariabe |thread1Thread1of1ForFork0_#t~post2| not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-12-14 16:54:31,241 WARN L322 ript$VariableManager]: TermVariabe thread1Thread1of1ForFork0_~i~0 not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-12-14 16:54:31,241 WARN L322 ript$VariableManager]: TermVariabe |thread1Thread1of1ForFork0_#t~post1| not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-12-14 16:54:31,242 WARN L322 ript$VariableManager]: TermVariabe thread1Thread1of1ForFork0_~i~0 not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-12-14 16:54:31,242 WARN L322 ript$VariableManager]: TermVariabe |thread1Thread1of1ForFork0_#t~post1| not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-12-14 16:54:31,242 WARN L322 ript$VariableManager]: TermVariabe |thread1Thread1of1ForFork0_#t~post1| not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-12-14 16:54:31,242 WARN L322 ript$VariableManager]: TermVariabe thread1Thread1of1ForFork0_~i~0 not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-12-14 16:54:31,242 WARN L322 ript$VariableManager]: TermVariabe |thread1Thread1of1ForFork0_#t~post1| not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-12-14 16:54:31,242 WARN L322 ript$VariableManager]: TermVariabe thread1Thread1of1ForFork0_~i~0 not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-12-14 16:54:31,242 WARN L322 ript$VariableManager]: TermVariabe |thread1Thread1of1ForFork0_#t~post1| not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-12-14 16:54:31,243 WARN L322 ript$VariableManager]: TermVariabe |thread1Thread1of1ForFork0_#t~post1| not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-12-14 16:54:31,243 WARN L322 ript$VariableManager]: TermVariabe thread2Thread1of1ForFork1_~i~1 not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-12-14 16:54:31,243 WARN L322 ript$VariableManager]: TermVariabe thread2Thread1of1ForFork1_~i~1 not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-12-14 16:54:31,243 WARN L322 ript$VariableManager]: TermVariabe thread2Thread1of1ForFork1_~i~1 not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-12-14 16:54:31,243 WARN L322 ript$VariableManager]: TermVariabe thread2Thread1of1ForFork1_~i~1 not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-12-14 16:54:31,244 WARN L322 ript$VariableManager]: TermVariabe thread2Thread1of1ForFork1_~i~1 not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-12-14 16:54:31,244 WARN L322 ript$VariableManager]: TermVariabe thread2Thread1of1ForFork1_~i~1 not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-12-14 16:54:31,244 WARN L322 ript$VariableManager]: TermVariabe |thread2Thread1of1ForFork1_#res.offset| not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-12-14 16:54:31,244 WARN L322 ript$VariableManager]: TermVariabe |thread2Thread1of1ForFork1_#res.base| not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-12-14 16:54:31,244 WARN L322 ript$VariableManager]: TermVariabe |thread2Thread1of1ForFork1_#res.offset| not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-12-14 16:54:31,244 WARN L322 ript$VariableManager]: TermVariabe |thread2Thread1of1ForFork1_#res.base| not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-12-14 16:54:31,245 WARN L322 ript$VariableManager]: TermVariabe |thread2Thread1of1ForFork1_#t~post3| not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-12-14 16:54:31,245 WARN L322 ript$VariableManager]: TermVariabe |thread2Thread1of1ForFork1_#t~post4| not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-12-14 16:54:31,245 WARN L322 ript$VariableManager]: TermVariabe thread2Thread1of1ForFork1_~i~1 not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-12-14 16:54:31,245 WARN L322 ript$VariableManager]: TermVariabe |thread2Thread1of1ForFork1_#t~post3| not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-12-14 16:54:31,245 WARN L322 ript$VariableManager]: TermVariabe |thread2Thread1of1ForFork1_#t~post4| not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-12-14 16:54:31,245 WARN L322 ript$VariableManager]: TermVariabe thread2Thread1of1ForFork1_~i~1 not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-12-14 16:54:31,246 WARN L322 ript$VariableManager]: TermVariabe |thread2Thread1of1ForFork1_#t~post3| not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-12-14 16:54:31,246 WARN L322 ript$VariableManager]: TermVariabe |thread2Thread1of1ForFork1_#t~post4| not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-12-14 16:54:31,246 WARN L322 ript$VariableManager]: TermVariabe thread2Thread1of1ForFork1_~i~1 not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-12-14 16:54:31,246 WARN L322 ript$VariableManager]: TermVariabe |thread2Thread1of1ForFork1_#t~post3| not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-12-14 16:54:31,246 WARN L322 ript$VariableManager]: TermVariabe |thread2Thread1of1ForFork1_#t~post4| not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-12-14 16:54:31,246 WARN L322 ript$VariableManager]: TermVariabe thread2Thread1of1ForFork1_~i~1 not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-12-14 16:54:31,248 WARN L322 ript$VariableManager]: TermVariabe |thread1Thread1of1ForFork0_#res.base| not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-12-14 16:54:31,249 WARN L322 ript$VariableManager]: TermVariabe |thread1Thread1of1ForFork0_#t~post1| not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-12-14 16:54:31,249 WARN L322 ript$VariableManager]: TermVariabe |thread1Thread1of1ForFork0_#t~post2| not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-12-14 16:54:31,249 WARN L322 ript$VariableManager]: TermVariabe thread1Thread1of1ForFork0_~i~0 not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-12-14 16:54:31,249 WARN L322 ript$VariableManager]: TermVariabe |thread1Thread1of1ForFork0_#res.offset| not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-12-14 16:54:31,250 WARN L322 ript$VariableManager]: TermVariabe |thread2Thread1of1ForFork1_#res.offset| not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-12-14 16:54:31,250 WARN L322 ript$VariableManager]: TermVariabe thread2Thread1of1ForFork1_~i~1 not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-12-14 16:54:31,250 WARN L322 ript$VariableManager]: TermVariabe |thread2Thread1of1ForFork1_#t~post4| not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-12-14 16:54:31,250 WARN L322 ript$VariableManager]: TermVariabe |thread2Thread1of1ForFork1_#t~post3| not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-12-14 16:54:31,250 WARN L322 ript$VariableManager]: TermVariabe |thread2Thread1of1ForFork1_#res.base| not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-12-14 16:54:31,252 INFO L148 ThreadInstanceAdder]: Constructed 2 joinOtherThreadTransitions. [2021-12-14 16:54:31,282 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-12-14 16:54:31,290 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 [2021-12-14 16:54:31,290 INFO L340 AbstractCegarLoop]: Starting to check reachability of 3 error locations. [2021-12-14 16:54:31,297 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 83 places, 82 transitions, 180 flow [2021-12-14 16:54:31,325 INFO L129 PetriNetUnfolder]: 6/80 cut-off events. [2021-12-14 16:54:31,326 INFO L130 PetriNetUnfolder]: For 2/2 co-relation queries the response was YES. [2021-12-14 16:54:31,328 INFO L84 FinitePrefix]: Finished finitePrefix Result has 89 conditions, 80 events. 6/80 cut-off events. For 2/2 co-relation queries the response was YES. Maximal size of possible extension queue 3. Compared 44 event pairs, 0 based on Foata normal form. 0/73 useless extension candidates. Maximal degree in co-relation 48. Up to 2 conditions per place. [2021-12-14 16:54:31,328 INFO L82 GeneralOperation]: Start removeDead. Operand has 83 places, 82 transitions, 180 flow [2021-12-14 16:54:31,331 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 72 places, 71 transitions, 154 flow [2021-12-14 16:54:31,345 INFO L129 PetriNetUnfolder]: 6/70 cut-off events. [2021-12-14 16:54:31,345 INFO L130 PetriNetUnfolder]: For 2/2 co-relation queries the response was YES. [2021-12-14 16:54:31,345 INFO L246 CegarLoopForPetriNet]: Found error trace [2021-12-14 16:54:31,346 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] [2021-12-14 16:54:31,346 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr1INUSE_VIOLATION] === [2021-12-14 16:54:31,350 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-14 16:54:31,350 INFO L85 PathProgramCache]: Analyzing trace with hash 1700112450, now seen corresponding path program 1 times [2021-12-14 16:54:31,356 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-14 16:54:31,356 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [186279175] [2021-12-14 16:54:31,356 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-14 16:54:31,357 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-14 16:54:31,427 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 16:54:31,470 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 16:54:31,471 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-14 16:54:31,471 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [186279175] [2021-12-14 16:54:31,471 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [186279175] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-14 16:54:31,472 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-14 16:54:31,472 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-12-14 16:54:31,473 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [447547693] [2021-12-14 16:54:31,473 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-14 16:54:31,479 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2021-12-14 16:54:31,479 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-14 16:54:31,495 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-12-14 16:54:31,497 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-12-14 16:54:31,498 INFO L499 CegarLoopForPetriNet]: Number of universal loopers: 71 out of 82 [2021-12-14 16:54:31,500 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 72 places, 71 transitions, 154 flow. Second operand has 2 states, 2 states have (on average 73.5) internal successors, (147), 2 states have internal predecessors, (147), 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) [2021-12-14 16:54:31,500 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-12-14 16:54:31,500 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 71 of 82 [2021-12-14 16:54:31,501 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-12-14 16:54:31,532 INFO L129 PetriNetUnfolder]: 10/93 cut-off events. [2021-12-14 16:54:31,532 INFO L130 PetriNetUnfolder]: For 18/19 co-relation queries the response was YES. [2021-12-14 16:54:31,533 INFO L84 FinitePrefix]: Finished finitePrefix Result has 125 conditions, 93 events. 10/93 cut-off events. For 18/19 co-relation queries the response was YES. Maximal size of possible extension queue 5. Compared 108 event pairs, 1 based on Foata normal form. 11/94 useless extension candidates. Maximal degree in co-relation 55. Up to 18 conditions per place. [2021-12-14 16:54:31,534 INFO L132 encePairwiseOnDemand]: 78/82 looper letters, 6 selfloop transitions, 0 changer transitions 2/67 dead transitions. [2021-12-14 16:54:31,534 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 73 places, 67 transitions, 158 flow [2021-12-14 16:54:31,536 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-12-14 16:54:31,538 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2 states. [2021-12-14 16:54:31,543 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2 states to 2 states and 152 transitions. [2021-12-14 16:54:31,547 INFO L544 CegarLoopForPetriNet]: DFA transition density 0.926829268292683 [2021-12-14 16:54:31,548 INFO L72 ComplementDD]: Start complementDD. Operand 2 states and 152 transitions. [2021-12-14 16:54:31,549 INFO L73 IsDeterministic]: Start isDeterministic. Operand 2 states and 152 transitions. [2021-12-14 16:54:31,550 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-12-14 16:54:31,552 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 2 states and 152 transitions. [2021-12-14 16:54:31,557 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 3 states, 2 states have (on average 76.0) internal successors, (152), 2 states have internal predecessors, (152), 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) [2021-12-14 16:54:31,560 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 3 states, 3 states have (on average 82.0) internal successors, (246), 3 states have internal predecessors, (246), 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) [2021-12-14 16:54:31,560 INFO L81 ComplementDD]: Finished complementDD. Result has 3 states, 3 states have (on average 82.0) internal successors, (246), 3 states have internal predecessors, (246), 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) [2021-12-14 16:54:31,561 INFO L186 Difference]: Start difference. First operand has 72 places, 71 transitions, 154 flow. Second operand 2 states and 152 transitions. [2021-12-14 16:54:31,562 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 73 places, 67 transitions, 158 flow [2021-12-14 16:54:31,566 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 69 places, 67 transitions, 150 flow, removed 0 selfloop flow, removed 4 redundant places. [2021-12-14 16:54:31,568 INFO L242 Difference]: Finished difference. Result has 69 places, 65 transitions, 134 flow [2021-12-14 16:54:31,570 INFO L317 CegarLoopForPetriNet]: {PETRI_ALPHABET=82, PETRI_DIFFERENCE_MINUEND_FLOW=138, PETRI_DIFFERENCE_MINUEND_PLACES=68, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=67, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=0, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=67, PETRI_DIFFERENCE_SUBTRAHEND_STATES=2, PETRI_FLOW=134, PETRI_PLACES=69, PETRI_TRANSITIONS=65} [2021-12-14 16:54:31,574 INFO L334 CegarLoopForPetriNet]: 72 programPoint places, -3 predicate places. [2021-12-14 16:54:31,574 INFO L470 AbstractCegarLoop]: Abstraction has has 69 places, 65 transitions, 134 flow [2021-12-14 16:54:31,575 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 73.5) internal successors, (147), 2 states have internal predecessors, (147), 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) [2021-12-14 16:54:31,575 INFO L246 CegarLoopForPetriNet]: Found error trace [2021-12-14 16:54:31,575 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] [2021-12-14 16:54:31,575 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-12-14 16:54:31,575 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr1INUSE_VIOLATION] === [2021-12-14 16:54:31,575 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-14 16:54:31,576 INFO L85 PathProgramCache]: Analyzing trace with hash 1829195169, now seen corresponding path program 1 times [2021-12-14 16:54:31,576 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-14 16:54:31,576 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [572680999] [2021-12-14 16:54:31,576 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-14 16:54:31,576 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-14 16:54:31,613 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 16:54:31,735 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 16:54:31,735 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-14 16:54:31,736 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [572680999] [2021-12-14 16:54:31,736 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [572680999] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-14 16:54:31,736 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-14 16:54:31,736 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-12-14 16:54:31,737 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [628917687] [2021-12-14 16:54:31,737 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-14 16:54:31,738 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-12-14 16:54:31,739 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-14 16:54:31,740 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-12-14 16:54:31,740 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=16, Unknown=0, NotChecked=0, Total=30 [2021-12-14 16:54:31,742 INFO L499 CegarLoopForPetriNet]: Number of universal loopers: 52 out of 82 [2021-12-14 16:54:31,743 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 69 places, 65 transitions, 134 flow. Second operand has 6 states, 6 states have (on average 54.833333333333336) internal successors, (329), 6 states have internal predecessors, (329), 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) [2021-12-14 16:54:31,743 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-12-14 16:54:31,743 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 52 of 82 [2021-12-14 16:54:31,743 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-12-14 16:54:31,845 INFO L129 PetriNetUnfolder]: 64/183 cut-off events. [2021-12-14 16:54:31,845 INFO L130 PetriNetUnfolder]: For 5/5 co-relation queries the response was YES. [2021-12-14 16:54:31,847 INFO L84 FinitePrefix]: Finished finitePrefix Result has 325 conditions, 183 events. 64/183 cut-off events. For 5/5 co-relation queries the response was YES. Maximal size of possible extension queue 15. Compared 533 event pairs, 25 based on Foata normal form. 0/153 useless extension candidates. Maximal degree in co-relation 322. Up to 80 conditions per place. [2021-12-14 16:54:31,849 INFO L132 encePairwiseOnDemand]: 76/82 looper letters, 26 selfloop transitions, 5 changer transitions 0/73 dead transitions. [2021-12-14 16:54:31,849 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 72 places, 73 transitions, 213 flow [2021-12-14 16:54:31,850 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-12-14 16:54:31,850 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6 states. [2021-12-14 16:54:31,853 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6 states to 6 states and 344 transitions. [2021-12-14 16:54:31,855 INFO L544 CegarLoopForPetriNet]: DFA transition density 0.6991869918699187 [2021-12-14 16:54:31,855 INFO L72 ComplementDD]: Start complementDD. Operand 6 states and 344 transitions. [2021-12-14 16:54:31,855 INFO L73 IsDeterministic]: Start isDeterministic. Operand 6 states and 344 transitions. [2021-12-14 16:54:31,855 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-12-14 16:54:31,855 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 6 states and 344 transitions. [2021-12-14 16:54:31,856 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 7 states, 6 states have (on average 57.333333333333336) internal successors, (344), 6 states have internal predecessors, (344), 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) [2021-12-14 16:54:31,857 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 7 states, 7 states have (on average 82.0) internal successors, (574), 7 states have internal predecessors, (574), 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) [2021-12-14 16:54:31,858 INFO L81 ComplementDD]: Finished complementDD. Result has 7 states, 7 states have (on average 82.0) internal successors, (574), 7 states have internal predecessors, (574), 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) [2021-12-14 16:54:31,858 INFO L186 Difference]: Start difference. First operand has 69 places, 65 transitions, 134 flow. Second operand 6 states and 344 transitions. [2021-12-14 16:54:31,859 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 72 places, 73 transitions, 213 flow [2021-12-14 16:54:31,859 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 72 places, 73 transitions, 213 flow, removed 0 selfloop flow, removed 0 redundant places. [2021-12-14 16:54:31,861 INFO L242 Difference]: Finished difference. Result has 73 places, 66 transitions, 152 flow [2021-12-14 16:54:31,861 INFO L317 CegarLoopForPetriNet]: {PETRI_ALPHABET=82, PETRI_DIFFERENCE_MINUEND_FLOW=134, PETRI_DIFFERENCE_MINUEND_PLACES=67, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=65, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=4, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=60, PETRI_DIFFERENCE_SUBTRAHEND_STATES=6, PETRI_FLOW=152, PETRI_PLACES=73, PETRI_TRANSITIONS=66} [2021-12-14 16:54:31,862 INFO L334 CegarLoopForPetriNet]: 72 programPoint places, 1 predicate places. [2021-12-14 16:54:31,862 INFO L470 AbstractCegarLoop]: Abstraction has has 73 places, 66 transitions, 152 flow [2021-12-14 16:54:31,863 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 54.833333333333336) internal successors, (329), 6 states have internal predecessors, (329), 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) [2021-12-14 16:54:31,863 INFO L246 CegarLoopForPetriNet]: Found error trace [2021-12-14 16:54:31,863 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, 1] [2021-12-14 16:54:31,863 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-12-14 16:54:31,864 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr1INUSE_VIOLATION] === [2021-12-14 16:54:31,864 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-14 16:54:31,865 INFO L85 PathProgramCache]: Analyzing trace with hash -332340421, now seen corresponding path program 1 times [2021-12-14 16:54:31,865 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-14 16:54:31,865 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1519948082] [2021-12-14 16:54:31,865 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-14 16:54:31,865 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-14 16:54:31,888 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 16:54:31,919 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 16:54:31,919 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-14 16:54:31,920 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1519948082] [2021-12-14 16:54:31,920 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1519948082] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-14 16:54:31,920 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-14 16:54:31,920 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-12-14 16:54:31,920 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1461968918] [2021-12-14 16:54:31,920 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-14 16:54:31,921 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-12-14 16:54:31,921 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-14 16:54:31,921 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-12-14 16:54:31,921 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-12-14 16:54:31,922 INFO L499 CegarLoopForPetriNet]: Number of universal loopers: 60 out of 82 [2021-12-14 16:54:31,922 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 73 places, 66 transitions, 152 flow. Second operand has 5 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) [2021-12-14 16:54:31,923 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-12-14 16:54:31,923 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 60 of 82 [2021-12-14 16:54:31,923 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-12-14 16:54:32,019 INFO L129 PetriNetUnfolder]: 87/283 cut-off events. [2021-12-14 16:54:32,019 INFO L130 PetriNetUnfolder]: For 52/52 co-relation queries the response was YES. [2021-12-14 16:54:32,022 INFO L84 FinitePrefix]: Finished finitePrefix Result has 522 conditions, 283 events. 87/283 cut-off events. For 52/52 co-relation queries the response was YES. Maximal size of possible extension queue 19. Compared 1086 event pairs, 37 based on Foata normal form. 1/257 useless extension candidates. Maximal degree in co-relation 517. Up to 113 conditions per place. [2021-12-14 16:54:32,023 INFO L132 encePairwiseOnDemand]: 75/82 looper letters, 32 selfloop transitions, 5 changer transitions 1/86 dead transitions. [2021-12-14 16:54:32,023 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 78 places, 86 transitions, 291 flow [2021-12-14 16:54:32,023 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-12-14 16:54:32,023 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6 states. [2021-12-14 16:54:32,024 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6 states to 6 states and 396 transitions. [2021-12-14 16:54:32,025 INFO L544 CegarLoopForPetriNet]: DFA transition density 0.8048780487804879 [2021-12-14 16:54:32,025 INFO L72 ComplementDD]: Start complementDD. Operand 6 states and 396 transitions. [2021-12-14 16:54:32,026 INFO L73 IsDeterministic]: Start isDeterministic. Operand 6 states and 396 transitions. [2021-12-14 16:54:32,026 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-12-14 16:54:32,028 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 6 states and 396 transitions. [2021-12-14 16:54:32,029 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 7 states, 6 states have (on average 66.0) internal successors, (396), 6 states have internal predecessors, (396), 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) [2021-12-14 16:54:32,031 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 7 states, 7 states have (on average 82.0) internal successors, (574), 7 states have internal predecessors, (574), 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) [2021-12-14 16:54:32,031 INFO L81 ComplementDD]: Finished complementDD. Result has 7 states, 7 states have (on average 82.0) internal successors, (574), 7 states have internal predecessors, (574), 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) [2021-12-14 16:54:32,032 INFO L186 Difference]: Start difference. First operand has 73 places, 66 transitions, 152 flow. Second operand 6 states and 396 transitions. [2021-12-14 16:54:32,032 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 78 places, 86 transitions, 291 flow [2021-12-14 16:54:32,034 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 74 places, 86 transitions, 279 flow, removed 0 selfloop flow, removed 4 redundant places. [2021-12-14 16:54:32,036 INFO L242 Difference]: Finished difference. Result has 77 places, 68 transitions, 170 flow [2021-12-14 16:54:32,036 INFO L317 CegarLoopForPetriNet]: {PETRI_ALPHABET=82, PETRI_DIFFERENCE_MINUEND_FLOW=144, PETRI_DIFFERENCE_MINUEND_PLACES=69, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=66, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=3, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=61, PETRI_DIFFERENCE_SUBTRAHEND_STATES=6, PETRI_FLOW=170, PETRI_PLACES=77, PETRI_TRANSITIONS=68} [2021-12-14 16:54:32,041 INFO L334 CegarLoopForPetriNet]: 72 programPoint places, 5 predicate places. [2021-12-14 16:54:32,041 INFO L470 AbstractCegarLoop]: Abstraction has has 77 places, 68 transitions, 170 flow [2021-12-14 16:54:32,042 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 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) [2021-12-14 16:54:32,042 INFO L246 CegarLoopForPetriNet]: Found error trace [2021-12-14 16:54:32,042 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, 1] [2021-12-14 16:54:32,042 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-12-14 16:54:32,042 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr1INUSE_VIOLATION] === [2021-12-14 16:54:32,044 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-14 16:54:32,044 INFO L85 PathProgramCache]: Analyzing trace with hash -1801956563, now seen corresponding path program 2 times [2021-12-14 16:54:32,045 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-14 16:54:32,045 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1169305902] [2021-12-14 16:54:32,045 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-14 16:54:32,045 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-14 16:54:32,074 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 16:54:32,139 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 16:54:32,140 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-14 16:54:32,141 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1169305902] [2021-12-14 16:54:32,141 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1169305902] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-14 16:54:32,141 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1393612409] [2021-12-14 16:54:32,141 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-14 16:54:32,141 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-14 16:54:32,142 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-14 16:54:32,144 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) [2021-12-14 16:54:32,167 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-12-14 16:54:32,212 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 1 check-sat command(s) [2021-12-14 16:54:32,212 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-14 16:54:32,214 INFO L263 TraceCheckSpWp]: Trace formula consists of 138 conjuncts, 7 conjunts are in the unsatisfiable core [2021-12-14 16:54:32,219 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-14 16:54:32,448 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-14 16:54:32,448 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-14 16:54:32,448 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1393612409] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-14 16:54:32,448 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-12-14 16:54:32,449 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [6] total 9 [2021-12-14 16:54:32,449 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1178816625] [2021-12-14 16:54:32,449 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-14 16:54:32,449 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-12-14 16:54:32,449 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-14 16:54:32,450 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-12-14 16:54:32,450 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=52, Unknown=0, NotChecked=0, Total=72 [2021-12-14 16:54:32,451 INFO L499 CegarLoopForPetriNet]: Number of universal loopers: 54 out of 82 [2021-12-14 16:54:32,452 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 77 places, 68 transitions, 170 flow. Second operand has 6 states, 6 states have (on average 57.166666666666664) internal successors, (343), 6 states have internal predecessors, (343), 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) [2021-12-14 16:54:32,452 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-12-14 16:54:32,452 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 54 of 82 [2021-12-14 16:54:32,452 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-12-14 16:54:32,567 INFO L129 PetriNetUnfolder]: 44/166 cut-off events. [2021-12-14 16:54:32,567 INFO L130 PetriNetUnfolder]: For 50/56 co-relation queries the response was YES. [2021-12-14 16:54:32,568 INFO L84 FinitePrefix]: Finished finitePrefix Result has 346 conditions, 166 events. 44/166 cut-off events. For 50/56 co-relation queries the response was YES. Maximal size of possible extension queue 15. Compared 530 event pairs, 23 based on Foata normal form. 13/174 useless extension candidates. Maximal degree in co-relation 338. Up to 66 conditions per place. [2021-12-14 16:54:32,568 INFO L132 encePairwiseOnDemand]: 74/82 looper letters, 20 selfloop transitions, 7 changer transitions 0/72 dead transitions. [2021-12-14 16:54:32,569 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 82 places, 72 transitions, 233 flow [2021-12-14 16:54:32,569 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-12-14 16:54:32,569 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 8 states. [2021-12-14 16:54:32,570 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8 states to 8 states and 460 transitions. [2021-12-14 16:54:32,570 INFO L544 CegarLoopForPetriNet]: DFA transition density 0.7012195121951219 [2021-12-14 16:54:32,570 INFO L72 ComplementDD]: Start complementDD. Operand 8 states and 460 transitions. [2021-12-14 16:54:32,571 INFO L73 IsDeterministic]: Start isDeterministic. Operand 8 states and 460 transitions. [2021-12-14 16:54:32,571 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-12-14 16:54:32,571 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 8 states and 460 transitions. [2021-12-14 16:54:32,572 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 9 states, 8 states have (on average 57.5) internal successors, (460), 8 states have internal predecessors, (460), 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) [2021-12-14 16:54:32,573 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 9 states, 9 states have (on average 82.0) internal successors, (738), 9 states have internal predecessors, (738), 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) [2021-12-14 16:54:32,573 INFO L81 ComplementDD]: Finished complementDD. Result has 9 states, 9 states have (on average 82.0) internal successors, (738), 9 states have internal predecessors, (738), 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) [2021-12-14 16:54:32,574 INFO L186 Difference]: Start difference. First operand has 77 places, 68 transitions, 170 flow. Second operand 8 states and 460 transitions. [2021-12-14 16:54:32,574 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 82 places, 72 transitions, 233 flow [2021-12-14 16:54:32,575 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 78 places, 72 transitions, 221 flow, removed 3 selfloop flow, removed 4 redundant places. [2021-12-14 16:54:32,576 INFO L242 Difference]: Finished difference. Result has 78 places, 67 transitions, 168 flow [2021-12-14 16:54:32,576 INFO L317 CegarLoopForPetriNet]: {PETRI_ALPHABET=82, PETRI_DIFFERENCE_MINUEND_FLOW=154, PETRI_DIFFERENCE_MINUEND_PLACES=71, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=67, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=7, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=60, PETRI_DIFFERENCE_SUBTRAHEND_STATES=8, PETRI_FLOW=168, PETRI_PLACES=78, PETRI_TRANSITIONS=67} [2021-12-14 16:54:32,577 INFO L334 CegarLoopForPetriNet]: 72 programPoint places, 6 predicate places. [2021-12-14 16:54:32,577 INFO L470 AbstractCegarLoop]: Abstraction has has 78 places, 67 transitions, 168 flow [2021-12-14 16:54:32,577 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 57.166666666666664) internal successors, (343), 6 states have internal predecessors, (343), 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) [2021-12-14 16:54:32,577 INFO L246 CegarLoopForPetriNet]: Found error trace [2021-12-14 16:54:32,577 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, 1, 1, 1] [2021-12-14 16:54:32,596 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-12-14 16:54:32,796 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-14 16:54:32,796 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr1INUSE_VIOLATION] === [2021-12-14 16:54:32,797 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-14 16:54:32,797 INFO L85 PathProgramCache]: Analyzing trace with hash 1474269123, now seen corresponding path program 1 times [2021-12-14 16:54:32,798 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-14 16:54:32,798 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1475117989] [2021-12-14 16:54:32,798 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-14 16:54:32,798 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-14 16:54:32,817 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 16:54:32,868 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 16:54:32,868 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-14 16:54:32,868 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1475117989] [2021-12-14 16:54:32,868 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1475117989] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-14 16:54:32,869 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [870112642] [2021-12-14 16:54:32,869 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-14 16:54:32,869 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-14 16:54:32,869 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-14 16:54:32,870 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) [2021-12-14 16:54:32,871 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-12-14 16:54:32,916 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 16:54:32,917 INFO L263 TraceCheckSpWp]: Trace formula consists of 148 conjuncts, 10 conjunts are in the unsatisfiable core [2021-12-14 16:54:32,919 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-14 16:54:33,038 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 16:54:33,039 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-14 16:54:33,437 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 16:54:33,439 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [870112642] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-14 16:54:33,439 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-14 16:54:33,439 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 7] total 8 [2021-12-14 16:54:33,439 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2110102834] [2021-12-14 16:54:33,440 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-14 16:54:33,441 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-12-14 16:54:33,441 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-14 16:54:33,441 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-12-14 16:54:33,442 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2021-12-14 16:54:33,443 INFO L499 CegarLoopForPetriNet]: Number of universal loopers: 60 out of 82 [2021-12-14 16:54:33,444 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 78 places, 67 transitions, 168 flow. Second operand has 8 states, 8 states have (on average 63.125) internal successors, (505), 8 states have internal predecessors, (505), 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) [2021-12-14 16:54:33,444 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-12-14 16:54:33,444 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 60 of 82 [2021-12-14 16:54:33,444 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-12-14 16:54:33,501 INFO L129 PetriNetUnfolder]: 17/162 cut-off events. [2021-12-14 16:54:33,501 INFO L130 PetriNetUnfolder]: For 38/44 co-relation queries the response was YES. [2021-12-14 16:54:33,501 INFO L84 FinitePrefix]: Finished finitePrefix Result has 272 conditions, 162 events. 17/162 cut-off events. For 38/44 co-relation queries the response was YES. Maximal size of possible extension queue 10. Compared 427 event pairs, 1 based on Foata normal form. 4/164 useless extension candidates. Maximal degree in co-relation 266. Up to 21 conditions per place. [2021-12-14 16:54:33,502 INFO L132 encePairwiseOnDemand]: 76/82 looper letters, 25 selfloop transitions, 5 changer transitions 5/86 dead transitions. [2021-12-14 16:54:33,502 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 83 places, 86 transitions, 302 flow [2021-12-14 16:54:33,502 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-12-14 16:54:33,503 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6 states. [2021-12-14 16:54:33,504 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6 states to 6 states and 393 transitions. [2021-12-14 16:54:33,506 INFO L544 CegarLoopForPetriNet]: DFA transition density 0.7987804878048781 [2021-12-14 16:54:33,506 INFO L72 ComplementDD]: Start complementDD. Operand 6 states and 393 transitions. [2021-12-14 16:54:33,506 INFO L73 IsDeterministic]: Start isDeterministic. Operand 6 states and 393 transitions. [2021-12-14 16:54:33,506 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-12-14 16:54:33,506 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 6 states and 393 transitions. [2021-12-14 16:54:33,507 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 7 states, 6 states have (on average 65.5) internal successors, (393), 6 states have internal predecessors, (393), 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) [2021-12-14 16:54:33,508 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 7 states, 7 states have (on average 82.0) internal successors, (574), 7 states have internal predecessors, (574), 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) [2021-12-14 16:54:33,508 INFO L81 ComplementDD]: Finished complementDD. Result has 7 states, 7 states have (on average 82.0) internal successors, (574), 7 states have internal predecessors, (574), 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) [2021-12-14 16:54:33,508 INFO L186 Difference]: Start difference. First operand has 78 places, 67 transitions, 168 flow. Second operand 6 states and 393 transitions. [2021-12-14 16:54:33,509 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 83 places, 86 transitions, 302 flow [2021-12-14 16:54:33,510 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 77 places, 86 transitions, 279 flow, removed 0 selfloop flow, removed 6 redundant places. [2021-12-14 16:54:33,511 INFO L242 Difference]: Finished difference. Result has 81 places, 71 transitions, 197 flow [2021-12-14 16:54:33,511 INFO L317 CegarLoopForPetriNet]: {PETRI_ALPHABET=82, PETRI_DIFFERENCE_MINUEND_FLOW=155, PETRI_DIFFERENCE_MINUEND_PLACES=72, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=67, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=2, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=63, PETRI_DIFFERENCE_SUBTRAHEND_STATES=6, PETRI_FLOW=197, PETRI_PLACES=81, PETRI_TRANSITIONS=71} [2021-12-14 16:54:33,513 INFO L334 CegarLoopForPetriNet]: 72 programPoint places, 9 predicate places. [2021-12-14 16:54:33,513 INFO L470 AbstractCegarLoop]: Abstraction has has 81 places, 71 transitions, 197 flow [2021-12-14 16:54:33,514 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 63.125) internal successors, (505), 8 states have internal predecessors, (505), 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) [2021-12-14 16:54:33,514 INFO L246 CegarLoopForPetriNet]: Found error trace [2021-12-14 16:54:33,514 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, 1, 1, 1] [2021-12-14 16:54:33,532 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-12-14 16:54:33,729 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 [2021-12-14 16:54:33,730 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr1INUSE_VIOLATION] === [2021-12-14 16:54:33,730 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-14 16:54:33,730 INFO L85 PathProgramCache]: Analyzing trace with hash 343908841, now seen corresponding path program 2 times [2021-12-14 16:54:33,730 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-14 16:54:33,731 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [252279971] [2021-12-14 16:54:33,731 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-14 16:54:33,731 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-14 16:54:33,741 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 16:54:33,783 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-14 16:54:33,784 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-14 16:54:33,784 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [252279971] [2021-12-14 16:54:33,784 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [252279971] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-14 16:54:33,784 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [297211106] [2021-12-14 16:54:33,784 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-14 16:54:33,785 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-14 16:54:33,785 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-14 16:54:33,786 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) [2021-12-14 16:54:33,787 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-12-14 16:54:33,829 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-14 16:54:33,829 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-14 16:54:33,830 INFO L263 TraceCheckSpWp]: Trace formula consists of 148 conjuncts, 4 conjunts are in the unsatisfiable core [2021-12-14 16:54:33,831 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-14 16:54:33,923 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-14 16:54:33,923 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-14 16:54:34,058 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-14 16:54:34,059 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [297211106] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-14 16:54:34,059 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-14 16:54:34,059 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5, 5] total 10 [2021-12-14 16:54:34,059 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [528637964] [2021-12-14 16:54:34,059 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-14 16:54:34,060 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-12-14 16:54:34,060 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-14 16:54:34,061 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-12-14 16:54:34,061 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=58, Unknown=0, NotChecked=0, Total=90 [2021-12-14 16:54:34,062 INFO L499 CegarLoopForPetriNet]: Number of universal loopers: 61 out of 82 [2021-12-14 16:54:34,062 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 81 places, 71 transitions, 197 flow. Second operand has 10 states, 10 states have (on average 64.1) internal successors, (641), 10 states have internal predecessors, (641), 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) [2021-12-14 16:54:34,063 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-12-14 16:54:34,063 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 61 of 82 [2021-12-14 16:54:34,063 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-12-14 16:54:34,149 INFO L129 PetriNetUnfolder]: 109/370 cut-off events. [2021-12-14 16:54:34,150 INFO L130 PetriNetUnfolder]: For 199/209 co-relation queries the response was YES. [2021-12-14 16:54:34,151 INFO L84 FinitePrefix]: Finished finitePrefix Result has 829 conditions, 370 events. 109/370 cut-off events. For 199/209 co-relation queries the response was YES. Maximal size of possible extension queue 30. Compared 1754 event pairs, 24 based on Foata normal form. 15/376 useless extension candidates. Maximal degree in co-relation 819. Up to 124 conditions per place. [2021-12-14 16:54:34,152 INFO L132 encePairwiseOnDemand]: 76/82 looper letters, 34 selfloop transitions, 15 changer transitions 0/99 dead transitions. [2021-12-14 16:54:34,152 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 85 places, 99 transitions, 414 flow [2021-12-14 16:54:34,152 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-12-14 16:54:34,152 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7 states. [2021-12-14 16:54:34,153 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7 states to 7 states and 466 transitions. [2021-12-14 16:54:34,153 INFO L544 CegarLoopForPetriNet]: DFA transition density 0.8118466898954704 [2021-12-14 16:54:34,153 INFO L72 ComplementDD]: Start complementDD. Operand 7 states and 466 transitions. [2021-12-14 16:54:34,154 INFO L73 IsDeterministic]: Start isDeterministic. Operand 7 states and 466 transitions. [2021-12-14 16:54:34,154 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-12-14 16:54:34,154 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 7 states and 466 transitions. [2021-12-14 16:54:34,155 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 8 states, 7 states have (on average 66.57142857142857) internal successors, (466), 7 states have internal predecessors, (466), 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) [2021-12-14 16:54:34,156 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 8 states, 8 states have (on average 82.0) internal successors, (656), 8 states have internal predecessors, (656), 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) [2021-12-14 16:54:34,156 INFO L81 ComplementDD]: Finished complementDD. Result has 8 states, 8 states have (on average 82.0) internal successors, (656), 8 states have internal predecessors, (656), 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) [2021-12-14 16:54:34,156 INFO L186 Difference]: Start difference. First operand has 81 places, 71 transitions, 197 flow. Second operand 7 states and 466 transitions. [2021-12-14 16:54:34,156 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 85 places, 99 transitions, 414 flow [2021-12-14 16:54:34,157 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 83 places, 99 transitions, 410 flow, removed 2 selfloop flow, removed 2 redundant places. [2021-12-14 16:54:34,158 INFO L242 Difference]: Finished difference. Result has 88 places, 84 transitions, 338 flow [2021-12-14 16:54:34,159 INFO L317 CegarLoopForPetriNet]: {PETRI_ALPHABET=82, PETRI_DIFFERENCE_MINUEND_FLOW=193, PETRI_DIFFERENCE_MINUEND_PLACES=77, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=71, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=6, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=63, PETRI_DIFFERENCE_SUBTRAHEND_STATES=7, PETRI_FLOW=338, PETRI_PLACES=88, PETRI_TRANSITIONS=84} [2021-12-14 16:54:34,159 INFO L334 CegarLoopForPetriNet]: 72 programPoint places, 16 predicate places. [2021-12-14 16:54:34,159 INFO L470 AbstractCegarLoop]: Abstraction has has 88 places, 84 transitions, 338 flow [2021-12-14 16:54:34,160 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 64.1) internal successors, (641), 10 states have internal predecessors, (641), 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) [2021-12-14 16:54:34,160 INFO L246 CegarLoopForPetriNet]: Found error trace [2021-12-14 16:54:34,160 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, 1, 1, 1] [2021-12-14 16:54:34,178 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-12-14 16:54:34,376 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 [2021-12-14 16:54:34,376 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr1INUSE_VIOLATION] === [2021-12-14 16:54:34,377 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-14 16:54:34,377 INFO L85 PathProgramCache]: Analyzing trace with hash 2134643199, now seen corresponding path program 3 times [2021-12-14 16:54:34,377 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-14 16:54:34,377 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [364545554] [2021-12-14 16:54:34,377 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-14 16:54:34,377 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-14 16:54:34,388 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 16:54:34,462 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 16:54:34,463 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-14 16:54:34,463 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [364545554] [2021-12-14 16:54:34,463 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [364545554] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-14 16:54:34,463 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [88260337] [2021-12-14 16:54:34,463 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-12-14 16:54:34,464 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-14 16:54:34,464 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-14 16:54:34,465 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) [2021-12-14 16:54:34,466 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-12-14 16:54:34,513 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-12-14 16:54:34,514 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-14 16:54:34,514 INFO L263 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 8 conjunts are in the unsatisfiable core [2021-12-14 16:54:34,521 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-14 16:54:34,701 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 1 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 16:54:34,701 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-14 16:54:34,860 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 5 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 16:54:34,860 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [88260337] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-14 16:54:34,860 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-14 16:54:34,861 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 9, 9] total 22 [2021-12-14 16:54:34,861 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [610298887] [2021-12-14 16:54:34,861 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-14 16:54:34,861 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2021-12-14 16:54:34,861 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-14 16:54:34,862 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-12-14 16:54:34,862 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=369, Unknown=0, NotChecked=0, Total=462 [2021-12-14 16:54:34,863 INFO L499 CegarLoopForPetriNet]: Number of universal loopers: 57 out of 82 [2021-12-14 16:54:34,864 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 88 places, 84 transitions, 338 flow. Second operand has 22 states, 22 states have (on average 59.54545454545455) internal successors, (1310), 22 states have internal predecessors, (1310), 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) [2021-12-14 16:54:34,864 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-12-14 16:54:34,864 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 57 of 82 [2021-12-14 16:54:34,864 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-12-14 16:54:36,360 INFO L129 PetriNetUnfolder]: 341/924 cut-off events. [2021-12-14 16:54:36,361 INFO L130 PetriNetUnfolder]: For 1534/1534 co-relation queries the response was YES. [2021-12-14 16:54:36,363 INFO L84 FinitePrefix]: Finished finitePrefix Result has 2748 conditions, 924 events. 341/924 cut-off events. For 1534/1534 co-relation queries the response was YES. Maximal size of possible extension queue 50. Compared 5105 event pairs, 5 based on Foata normal form. 29/953 useless extension candidates. Maximal degree in co-relation 2735. Up to 175 conditions per place. [2021-12-14 16:54:36,367 INFO L132 encePairwiseOnDemand]: 71/82 looper letters, 126 selfloop transitions, 180 changer transitions 9/360 dead transitions. [2021-12-14 16:54:36,368 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 156 places, 360 transitions, 2526 flow [2021-12-14 16:54:36,368 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 69 states. [2021-12-14 16:54:36,368 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 69 states. [2021-12-14 16:54:36,373 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 4205 transitions. [2021-12-14 16:54:36,375 INFO L544 CegarLoopForPetriNet]: DFA transition density 0.7431954754330152 [2021-12-14 16:54:36,375 INFO L72 ComplementDD]: Start complementDD. Operand 69 states and 4205 transitions. [2021-12-14 16:54:36,375 INFO L73 IsDeterministic]: Start isDeterministic. Operand 69 states and 4205 transitions. [2021-12-14 16:54:36,377 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-12-14 16:54:36,377 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 69 states and 4205 transitions. [2021-12-14 16:54:36,383 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 70 states, 69 states have (on average 60.94202898550725) internal successors, (4205), 69 states have internal predecessors, (4205), 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) [2021-12-14 16:54:36,390 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 70 states, 70 states have (on average 82.0) internal successors, (5740), 70 states have internal predecessors, (5740), 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) [2021-12-14 16:54:36,391 INFO L81 ComplementDD]: Finished complementDD. Result has 70 states, 70 states have (on average 82.0) internal successors, (5740), 70 states have internal predecessors, (5740), 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) [2021-12-14 16:54:36,392 INFO L186 Difference]: Start difference. First operand has 88 places, 84 transitions, 338 flow. Second operand 69 states and 4205 transitions. [2021-12-14 16:54:36,392 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 156 places, 360 transitions, 2526 flow [2021-12-14 16:54:36,396 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 156 places, 360 transitions, 2514 flow, removed 6 selfloop flow, removed 0 redundant places. [2021-12-14 16:54:36,400 INFO L242 Difference]: Finished difference. Result has 191 places, 245 transitions, 1966 flow [2021-12-14 16:54:36,400 INFO L317 CegarLoopForPetriNet]: {PETRI_ALPHABET=82, PETRI_DIFFERENCE_MINUEND_FLOW=334, PETRI_DIFFERENCE_MINUEND_PLACES=88, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=84, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=20, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=60, PETRI_DIFFERENCE_SUBTRAHEND_STATES=69, PETRI_FLOW=1966, PETRI_PLACES=191, PETRI_TRANSITIONS=245} [2021-12-14 16:54:36,401 INFO L334 CegarLoopForPetriNet]: 72 programPoint places, 119 predicate places. [2021-12-14 16:54:36,401 INFO L470 AbstractCegarLoop]: Abstraction has has 191 places, 245 transitions, 1966 flow [2021-12-14 16:54:36,401 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 59.54545454545455) internal successors, (1310), 22 states have internal predecessors, (1310), 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) [2021-12-14 16:54:36,401 INFO L246 CegarLoopForPetriNet]: Found error trace [2021-12-14 16:54:36,401 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, 1, 1, 1] [2021-12-14 16:54:36,420 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-12-14 16:54:36,615 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-14 16:54:36,615 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr1INUSE_VIOLATION] === [2021-12-14 16:54:36,616 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-14 16:54:36,616 INFO L85 PathProgramCache]: Analyzing trace with hash -1131716833, now seen corresponding path program 4 times [2021-12-14 16:54:36,616 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-14 16:54:36,616 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [821980253] [2021-12-14 16:54:36,616 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-14 16:54:36,616 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-14 16:54:36,625 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 16:54:36,721 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 16:54:36,722 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-14 16:54:36,722 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [821980253] [2021-12-14 16:54:36,722 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [821980253] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-14 16:54:36,722 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [350352171] [2021-12-14 16:54:36,722 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-12-14 16:54:36,723 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-14 16:54:36,723 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-14 16:54:36,724 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) [2021-12-14 16:54:36,725 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-12-14 16:54:36,779 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-12-14 16:54:36,779 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-14 16:54:36,780 INFO L263 TraceCheckSpWp]: Trace formula consists of 138 conjuncts, 10 conjunts are in the unsatisfiable core [2021-12-14 16:54:36,781 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-14 16:54:37,003 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 1 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 16:54:37,003 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-14 16:54:37,208 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 16:54:37,210 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [350352171] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-14 16:54:37,210 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-14 16:54:37,210 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 9] total 25 [2021-12-14 16:54:37,211 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [703041353] [2021-12-14 16:54:37,211 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-14 16:54:37,212 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2021-12-14 16:54:37,212 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-14 16:54:37,213 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-12-14 16:54:37,214 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=116, Invalid=484, Unknown=0, NotChecked=0, Total=600 [2021-12-14 16:54:37,215 INFO L499 CegarLoopForPetriNet]: Number of universal loopers: 57 out of 82 [2021-12-14 16:54:37,217 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 191 places, 245 transitions, 1966 flow. Second operand has 25 states, 25 states have (on average 59.68) internal successors, (1492), 25 states have internal predecessors, (1492), 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) [2021-12-14 16:54:37,217 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-12-14 16:54:37,217 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 57 of 82 [2021-12-14 16:54:37,217 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-12-14 16:54:38,113 INFO L129 PetriNetUnfolder]: 521/1417 cut-off events. [2021-12-14 16:54:38,113 INFO L130 PetriNetUnfolder]: For 34566/34566 co-relation queries the response was YES. [2021-12-14 16:54:38,119 INFO L84 FinitePrefix]: Finished finitePrefix Result has 8022 conditions, 1417 events. 521/1417 cut-off events. For 34566/34566 co-relation queries the response was YES. Maximal size of possible extension queue 80. Compared 9224 event pairs, 3 based on Foata normal form. 31/1447 useless extension candidates. Maximal degree in co-relation 7973. Up to 290 conditions per place. [2021-12-14 16:54:38,128 INFO L132 encePairwiseOnDemand]: 70/82 looper letters, 157 selfloop transitions, 287 changer transitions 7/496 dead transitions. [2021-12-14 16:54:38,128 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 229 places, 496 transitions, 5587 flow [2021-12-14 16:54:38,128 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2021-12-14 16:54:38,129 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2021-12-14 16:54:38,130 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 2387 transitions. [2021-12-14 16:54:38,131 INFO L544 CegarLoopForPetriNet]: DFA transition density 0.7464040025015635 [2021-12-14 16:54:38,131 INFO L72 ComplementDD]: Start complementDD. Operand 39 states and 2387 transitions. [2021-12-14 16:54:38,131 INFO L73 IsDeterministic]: Start isDeterministic. Operand 39 states and 2387 transitions. [2021-12-14 16:54:38,132 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-12-14 16:54:38,132 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 39 states and 2387 transitions. [2021-12-14 16:54:38,135 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 40 states, 39 states have (on average 61.205128205128204) internal successors, (2387), 39 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) [2021-12-14 16:54:38,138 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 40 states, 40 states have (on average 82.0) internal successors, (3280), 40 states have internal predecessors, (3280), 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) [2021-12-14 16:54:38,139 INFO L81 ComplementDD]: Finished complementDD. Result has 40 states, 40 states have (on average 82.0) internal successors, (3280), 40 states have internal predecessors, (3280), 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) [2021-12-14 16:54:38,139 INFO L186 Difference]: Start difference. First operand has 191 places, 245 transitions, 1966 flow. Second operand 39 states and 2387 transitions. [2021-12-14 16:54:38,139 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 229 places, 496 transitions, 5587 flow [2021-12-14 16:54:38,193 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 224 places, 496 transitions, 5042 flow, removed 195 selfloop flow, removed 5 redundant places. [2021-12-14 16:54:38,199 INFO L242 Difference]: Finished difference. Result has 237 places, 404 transitions, 4532 flow [2021-12-14 16:54:38,199 INFO L317 CegarLoopForPetriNet]: {PETRI_ALPHABET=82, PETRI_DIFFERENCE_MINUEND_FLOW=1713, PETRI_DIFFERENCE_MINUEND_PLACES=186, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=245, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=141, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=89, PETRI_DIFFERENCE_SUBTRAHEND_STATES=39, PETRI_FLOW=4532, PETRI_PLACES=237, PETRI_TRANSITIONS=404} [2021-12-14 16:54:38,200 INFO L334 CegarLoopForPetriNet]: 72 programPoint places, 165 predicate places. [2021-12-14 16:54:38,200 INFO L470 AbstractCegarLoop]: Abstraction has has 237 places, 404 transitions, 4532 flow [2021-12-14 16:54:38,201 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 59.68) internal successors, (1492), 25 states have internal predecessors, (1492), 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) [2021-12-14 16:54:38,201 INFO L246 CegarLoopForPetriNet]: Found error trace [2021-12-14 16:54:38,201 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, 1, 1, 1] [2021-12-14 16:54:38,218 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-12-14 16:54:38,412 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-14 16:54:38,412 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr1INUSE_VIOLATION] === [2021-12-14 16:54:38,413 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-14 16:54:38,413 INFO L85 PathProgramCache]: Analyzing trace with hash -360678591, now seen corresponding path program 5 times [2021-12-14 16:54:38,413 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-14 16:54:38,413 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [688219635] [2021-12-14 16:54:38,413 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-14 16:54:38,413 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-14 16:54:38,422 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 16:54:38,500 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 6 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 16:54:38,500 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-14 16:54:38,500 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [688219635] [2021-12-14 16:54:38,500 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [688219635] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-14 16:54:38,501 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1444106867] [2021-12-14 16:54:38,501 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-12-14 16:54:38,501 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-14 16:54:38,501 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-14 16:54:38,502 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) [2021-12-14 16:54:38,503 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-12-14 16:54:38,555 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2021-12-14 16:54:38,555 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-14 16:54:38,556 INFO L263 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 8 conjunts are in the unsatisfiable core [2021-12-14 16:54:38,557 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-14 16:54:38,699 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 7 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 16:54:38,699 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-14 16:54:38,858 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 6 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 16:54:38,859 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1444106867] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-14 16:54:38,859 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-14 16:54:38,859 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9, 9] total 20 [2021-12-14 16:54:38,859 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1872479168] [2021-12-14 16:54:38,860 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-14 16:54:38,860 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2021-12-14 16:54:38,860 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-14 16:54:38,860 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-12-14 16:54:38,861 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=301, Unknown=0, NotChecked=0, Total=380 [2021-12-14 16:54:38,862 INFO L499 CegarLoopForPetriNet]: Number of universal loopers: 57 out of 82 [2021-12-14 16:54:38,862 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 237 places, 404 transitions, 4532 flow. Second operand has 20 states, 20 states have (on average 59.25) internal successors, (1185), 20 states have internal predecessors, (1185), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-14 16:54:38,863 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-12-14 16:54:38,863 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 57 of 82 [2021-12-14 16:54:38,863 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-12-14 16:54:40,147 INFO L129 PetriNetUnfolder]: 708/2099 cut-off events. [2021-12-14 16:54:40,147 INFO L130 PetriNetUnfolder]: For 51745/51745 co-relation queries the response was YES. [2021-12-14 16:54:40,160 INFO L84 FinitePrefix]: Finished finitePrefix Result has 12324 conditions, 2099 events. 708/2099 cut-off events. For 51745/51745 co-relation queries the response was YES. Maximal size of possible extension queue 132. Compared 16110 event pairs, 15 based on Foata normal form. 31/2122 useless extension candidates. Maximal degree in co-relation 12263. Up to 360 conditions per place. [2021-12-14 16:54:40,173 INFO L132 encePairwiseOnDemand]: 69/82 looper letters, 233 selfloop transitions, 439 changer transitions 19/736 dead transitions. [2021-12-14 16:54:40,174 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 303 places, 736 transitions, 9640 flow [2021-12-14 16:54:40,174 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 67 states. [2021-12-14 16:54:40,174 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 67 states. [2021-12-14 16:54:40,177 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 4073 transitions. [2021-12-14 16:54:40,178 INFO L544 CegarLoopForPetriNet]: DFA transition density 0.741354204586822 [2021-12-14 16:54:40,178 INFO L72 ComplementDD]: Start complementDD. Operand 67 states and 4073 transitions. [2021-12-14 16:54:40,178 INFO L73 IsDeterministic]: Start isDeterministic. Operand 67 states and 4073 transitions. [2021-12-14 16:54:40,179 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-12-14 16:54:40,180 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 67 states and 4073 transitions. [2021-12-14 16:54:40,184 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 68 states, 67 states have (on average 60.791044776119406) internal successors, (4073), 67 states have internal predecessors, (4073), 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) [2021-12-14 16:54:40,190 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 68 states, 68 states have (on average 82.0) internal successors, (5576), 68 states have internal predecessors, (5576), 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) [2021-12-14 16:54:40,192 INFO L81 ComplementDD]: Finished complementDD. Result has 68 states, 68 states have (on average 82.0) internal successors, (5576), 68 states have internal predecessors, (5576), 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) [2021-12-14 16:54:40,192 INFO L186 Difference]: Start difference. First operand has 237 places, 404 transitions, 4532 flow. Second operand 67 states and 4073 transitions. [2021-12-14 16:54:40,192 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 303 places, 736 transitions, 9640 flow [2021-12-14 16:54:40,332 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 294 places, 736 transitions, 8645 flow, removed 472 selfloop flow, removed 9 redundant places. [2021-12-14 16:54:40,341 INFO L242 Difference]: Finished difference. Result has 317 places, 592 transitions, 7602 flow [2021-12-14 16:54:40,342 INFO L317 CegarLoopForPetriNet]: {PETRI_ALPHABET=82, PETRI_DIFFERENCE_MINUEND_FLOW=3847, PETRI_DIFFERENCE_MINUEND_PLACES=228, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=404, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=263, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=114, PETRI_DIFFERENCE_SUBTRAHEND_STATES=67, PETRI_FLOW=7602, PETRI_PLACES=317, PETRI_TRANSITIONS=592} [2021-12-14 16:54:40,342 INFO L334 CegarLoopForPetriNet]: 72 programPoint places, 245 predicate places. [2021-12-14 16:54:40,342 INFO L470 AbstractCegarLoop]: Abstraction has has 317 places, 592 transitions, 7602 flow [2021-12-14 16:54:40,343 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 59.25) internal successors, (1185), 20 states have internal predecessors, (1185), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-14 16:54:40,343 INFO L246 CegarLoopForPetriNet]: Found error trace [2021-12-14 16:54:40,343 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, 1, 1, 1] [2021-12-14 16:54:40,359 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-12-14 16:54:40,559 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-14 16:54:40,560 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr1INUSE_VIOLATION] === [2021-12-14 16:54:40,560 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-14 16:54:40,560 INFO L85 PathProgramCache]: Analyzing trace with hash 556953787, now seen corresponding path program 6 times [2021-12-14 16:54:40,560 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-14 16:54:40,560 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1349302613] [2021-12-14 16:54:40,561 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-14 16:54:40,561 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-14 16:54:40,570 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 16:54:40,631 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 6 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 16:54:40,632 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-14 16:54:40,632 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1349302613] [2021-12-14 16:54:40,632 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1349302613] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-14 16:54:40,632 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [990811664] [2021-12-14 16:54:40,633 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-12-14 16:54:40,633 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-14 16:54:40,634 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-14 16:54:40,635 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) [2021-12-14 16:54:40,649 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-12-14 16:54:40,729 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 4 check-sat command(s) [2021-12-14 16:54:40,730 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-14 16:54:40,730 INFO L263 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 9 conjunts are in the unsatisfiable core [2021-12-14 16:54:40,731 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-14 16:54:40,924 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 6 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 16:54:40,924 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-14 16:54:41,159 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 6 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 16:54:41,160 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [990811664] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-14 16:54:41,160 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-14 16:54:41,160 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 9] total 22 [2021-12-14 16:54:41,160 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [234869060] [2021-12-14 16:54:41,160 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-14 16:54:41,160 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2021-12-14 16:54:41,160 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-14 16:54:41,161 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-12-14 16:54:41,161 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=104, Invalid=358, Unknown=0, NotChecked=0, Total=462 [2021-12-14 16:54:41,162 INFO L499 CegarLoopForPetriNet]: Number of universal loopers: 57 out of 82 [2021-12-14 16:54:41,163 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 317 places, 592 transitions, 7602 flow. Second operand has 22 states, 22 states have (on average 59.45454545454545) internal successors, (1308), 22 states have internal predecessors, (1308), 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) [2021-12-14 16:54:41,163 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-12-14 16:54:41,163 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 57 of 82 [2021-12-14 16:54:41,163 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-12-14 16:54:42,271 INFO L129 PetriNetUnfolder]: 840/2458 cut-off events. [2021-12-14 16:54:42,271 INFO L130 PetriNetUnfolder]: For 42340/42340 co-relation queries the response was YES. [2021-12-14 16:54:42,286 INFO L84 FinitePrefix]: Finished finitePrefix Result has 14598 conditions, 2458 events. 840/2458 cut-off events. For 42340/42340 co-relation queries the response was YES. Maximal size of possible extension queue 173. Compared 19700 event pairs, 14 based on Foata normal form. 1/2455 useless extension candidates. Maximal degree in co-relation 14516. Up to 440 conditions per place. [2021-12-14 16:54:42,300 INFO L132 encePairwiseOnDemand]: 70/82 looper letters, 321 selfloop transitions, 521 changer transitions 17/904 dead transitions. [2021-12-14 16:54:42,300 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 355 places, 904 transitions, 13698 flow [2021-12-14 16:54:42,301 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2021-12-14 16:54:42,301 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2021-12-14 16:54:42,302 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 2515 transitions. [2021-12-14 16:54:42,304 INFO L544 CegarLoopForPetriNet]: DFA transition density 0.7480666270077335 [2021-12-14 16:54:42,304 INFO L72 ComplementDD]: Start complementDD. Operand 41 states and 2515 transitions. [2021-12-14 16:54:42,304 INFO L73 IsDeterministic]: Start isDeterministic. Operand 41 states and 2515 transitions. [2021-12-14 16:54:42,304 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-12-14 16:54:42,305 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 41 states and 2515 transitions. [2021-12-14 16:54:42,308 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 42 states, 41 states have (on average 61.34146341463415) internal successors, (2515), 41 states have internal predecessors, (2515), 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) [2021-12-14 16:54:42,311 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 42 states, 42 states have (on average 82.0) internal successors, (3444), 42 states have internal predecessors, (3444), 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) [2021-12-14 16:54:42,321 INFO L81 ComplementDD]: Finished complementDD. Result has 42 states, 42 states have (on average 82.0) internal successors, (3444), 42 states have internal predecessors, (3444), 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) [2021-12-14 16:54:42,321 INFO L186 Difference]: Start difference. First operand has 317 places, 592 transitions, 7602 flow. Second operand 41 states and 2515 transitions. [2021-12-14 16:54:42,321 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 355 places, 904 transitions, 13698 flow [2021-12-14 16:54:42,544 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 327 places, 904 transitions, 13001 flow, removed 213 selfloop flow, removed 28 redundant places. [2021-12-14 16:54:42,555 INFO L242 Difference]: Finished difference. Result has 337 places, 752 transitions, 10690 flow [2021-12-14 16:54:42,556 INFO L317 CegarLoopForPetriNet]: {PETRI_ALPHABET=82, PETRI_DIFFERENCE_MINUEND_FLOW=7057, PETRI_DIFFERENCE_MINUEND_PLACES=287, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=589, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=363, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=199, PETRI_DIFFERENCE_SUBTRAHEND_STATES=41, PETRI_FLOW=10690, PETRI_PLACES=337, PETRI_TRANSITIONS=752} [2021-12-14 16:54:42,556 INFO L334 CegarLoopForPetriNet]: 72 programPoint places, 265 predicate places. [2021-12-14 16:54:42,557 INFO L470 AbstractCegarLoop]: Abstraction has has 337 places, 752 transitions, 10690 flow [2021-12-14 16:54:42,557 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 59.45454545454545) internal successors, (1308), 22 states have internal predecessors, (1308), 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) [2021-12-14 16:54:42,557 INFO L246 CegarLoopForPetriNet]: Found error trace [2021-12-14 16:54:42,558 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, 1, 1, 1] [2021-12-14 16:54:42,575 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2021-12-14 16:54:42,761 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,8 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-14 16:54:42,761 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr1INUSE_VIOLATION] === [2021-12-14 16:54:42,762 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-14 16:54:42,762 INFO L85 PathProgramCache]: Analyzing trace with hash -667796903, now seen corresponding path program 7 times [2021-12-14 16:54:42,762 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-14 16:54:42,762 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1694787107] [2021-12-14 16:54:42,762 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-14 16:54:42,762 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-14 16:54:42,776 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 16:54:42,847 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 6 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 16:54:42,848 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-14 16:54:42,848 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1694787107] [2021-12-14 16:54:42,848 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1694787107] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-14 16:54:42,848 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1221814388] [2021-12-14 16:54:42,848 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-12-14 16:54:42,848 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-14 16:54:42,849 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-14 16:54:42,849 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) [2021-12-14 16:54:42,851 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-12-14 16:54:42,903 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 16:54:42,904 INFO L263 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 9 conjunts are in the unsatisfiable core [2021-12-14 16:54:42,905 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-14 16:54:43,087 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 6 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 16:54:43,087 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-14 16:54:43,311 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 6 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 16:54:43,312 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1221814388] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-14 16:54:43,312 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-14 16:54:43,312 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 9] total 24 [2021-12-14 16:54:43,312 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1907544725] [2021-12-14 16:54:43,312 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-14 16:54:43,313 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2021-12-14 16:54:43,313 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-14 16:54:43,313 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-12-14 16:54:43,313 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=98, Invalid=454, Unknown=0, NotChecked=0, Total=552 [2021-12-14 16:54:43,314 INFO L499 CegarLoopForPetriNet]: Number of universal loopers: 57 out of 82 [2021-12-14 16:54:43,315 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 337 places, 752 transitions, 10690 flow. Second operand has 24 states, 24 states have (on average 59.291666666666664) internal successors, (1423), 24 states have internal predecessors, (1423), 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) [2021-12-14 16:54:43,315 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-12-14 16:54:43,315 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 57 of 82 [2021-12-14 16:54:43,316 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-12-14 16:54:44,173 INFO L129 PetriNetUnfolder]: 845/2458 cut-off events. [2021-12-14 16:54:44,173 INFO L130 PetriNetUnfolder]: For 42600/42600 co-relation queries the response was YES. [2021-12-14 16:54:44,190 INFO L84 FinitePrefix]: Finished finitePrefix Result has 15242 conditions, 2458 events. 845/2458 cut-off events. For 42600/42600 co-relation queries the response was YES. Maximal size of possible extension queue 172. Compared 19526 event pairs, 67 based on Foata normal form. 1/2421 useless extension candidates. Maximal degree in co-relation 15156. Up to 440 conditions per place. [2021-12-14 16:54:44,212 INFO L132 encePairwiseOnDemand]: 71/82 looper letters, 334 selfloop transitions, 444 changer transitions 7/830 dead transitions. [2021-12-14 16:54:44,212 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 354 places, 830 transitions, 13357 flow [2021-12-14 16:54:44,213 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-12-14 16:54:44,213 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2021-12-14 16:54:44,217 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 1296 transitions. [2021-12-14 16:54:44,219 INFO L544 CegarLoopForPetriNet]: DFA transition density 0.7526132404181185 [2021-12-14 16:54:44,219 INFO L72 ComplementDD]: Start complementDD. Operand 21 states and 1296 transitions. [2021-12-14 16:54:44,219 INFO L73 IsDeterministic]: Start isDeterministic. Operand 21 states and 1296 transitions. [2021-12-14 16:54:44,220 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-12-14 16:54:44,220 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 21 states and 1296 transitions. [2021-12-14 16:54:44,224 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 22 states, 21 states have (on average 61.714285714285715) internal successors, (1296), 21 states have internal predecessors, (1296), 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) [2021-12-14 16:54:44,228 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 22 states, 22 states have (on average 82.0) internal successors, (1804), 22 states have internal predecessors, (1804), 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) [2021-12-14 16:54:44,229 INFO L81 ComplementDD]: Finished complementDD. Result has 22 states, 22 states have (on average 82.0) internal successors, (1804), 22 states have internal predecessors, (1804), 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) [2021-12-14 16:54:44,229 INFO L186 Difference]: Start difference. First operand has 337 places, 752 transitions, 10690 flow. Second operand 21 states and 1296 transitions. [2021-12-14 16:54:44,229 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 354 places, 830 transitions, 13357 flow [2021-12-14 16:54:44,489 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 337 places, 830 transitions, 13013 flow, removed 61 selfloop flow, removed 17 redundant places. [2021-12-14 16:54:44,501 INFO L242 Difference]: Finished difference. Result has 341 places, 778 transitions, 11704 flow [2021-12-14 16:54:44,502 INFO L317 CegarLoopForPetriNet]: {PETRI_ALPHABET=82, PETRI_DIFFERENCE_MINUEND_FLOW=10399, PETRI_DIFFERENCE_MINUEND_PLACES=317, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=752, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=418, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=327, PETRI_DIFFERENCE_SUBTRAHEND_STATES=21, PETRI_FLOW=11704, PETRI_PLACES=341, PETRI_TRANSITIONS=778} [2021-12-14 16:54:44,503 INFO L334 CegarLoopForPetriNet]: 72 programPoint places, 269 predicate places. [2021-12-14 16:54:44,503 INFO L470 AbstractCegarLoop]: Abstraction has has 341 places, 778 transitions, 11704 flow [2021-12-14 16:54:44,503 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 59.291666666666664) internal successors, (1423), 24 states have internal predecessors, (1423), 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) [2021-12-14 16:54:44,503 INFO L246 CegarLoopForPetriNet]: Found error trace [2021-12-14 16:54:44,503 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, 1, 1, 1] [2021-12-14 16:54:44,520 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-12-14 16:54:44,712 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,SelfDestructingSolverStorable10 [2021-12-14 16:54:44,714 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr1INUSE_VIOLATION] === [2021-12-14 16:54:44,714 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-14 16:54:44,714 INFO L85 PathProgramCache]: Analyzing trace with hash -845710819, now seen corresponding path program 8 times [2021-12-14 16:54:44,714 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-14 16:54:44,715 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1887917130] [2021-12-14 16:54:44,715 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-14 16:54:44,715 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-14 16:54:44,736 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 16:54:44,826 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 6 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 16:54:44,826 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-14 16:54:44,826 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1887917130] [2021-12-14 16:54:44,826 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1887917130] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-14 16:54:44,827 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [403963542] [2021-12-14 16:54:44,827 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-14 16:54:44,827 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-14 16:54:44,827 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-14 16:54:44,828 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) [2021-12-14 16:54:44,829 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-12-14 16:54:44,873 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-14 16:54:44,873 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-14 16:54:44,874 INFO L263 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 9 conjunts are in the unsatisfiable core [2021-12-14 16:54:44,874 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-14 16:54:45,042 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 6 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 16:54:45,042 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-14 16:54:45,264 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 6 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 16:54:45,264 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [403963542] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-14 16:54:45,264 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-14 16:54:45,265 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 9] total 23 [2021-12-14 16:54:45,266 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1206882732] [2021-12-14 16:54:45,266 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-14 16:54:45,268 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2021-12-14 16:54:45,268 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-14 16:54:45,268 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-12-14 16:54:45,268 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=94, Invalid=412, Unknown=0, NotChecked=0, Total=506 [2021-12-14 16:54:45,270 INFO L499 CegarLoopForPetriNet]: Number of universal loopers: 57 out of 82 [2021-12-14 16:54:45,271 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 341 places, 778 transitions, 11704 flow. Second operand has 23 states, 23 states have (on average 59.34782608695652) internal successors, (1365), 23 states have internal predecessors, (1365), 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) [2021-12-14 16:54:45,271 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-12-14 16:54:45,271 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 57 of 82 [2021-12-14 16:54:45,271 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-12-14 16:54:46,948 INFO L129 PetriNetUnfolder]: 1271/3795 cut-off events. [2021-12-14 16:54:46,948 INFO L130 PetriNetUnfolder]: For 74168/74168 co-relation queries the response was YES. [2021-12-14 16:54:46,975 INFO L84 FinitePrefix]: Finished finitePrefix Result has 24499 conditions, 3795 events. 1271/3795 cut-off events. For 74168/74168 co-relation queries the response was YES. Maximal size of possible extension queue 257. Compared 33307 event pairs, 38 based on Foata normal form. 9/3789 useless extension candidates. Maximal degree in co-relation 24413. Up to 627 conditions per place. [2021-12-14 16:54:46,996 INFO L132 encePairwiseOnDemand]: 70/82 looper letters, 442 selfloop transitions, 810 changer transitions 14/1311 dead transitions. [2021-12-14 16:54:46,997 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 382 places, 1311 transitions, 22568 flow [2021-12-14 16:54:46,997 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2021-12-14 16:54:46,997 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2021-12-14 16:54:46,998 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 2719 transitions. [2021-12-14 16:54:46,999 INFO L544 CegarLoopForPetriNet]: DFA transition density 0.7536031042128604 [2021-12-14 16:54:46,999 INFO L72 ComplementDD]: Start complementDD. Operand 44 states and 2719 transitions. [2021-12-14 16:54:47,000 INFO L73 IsDeterministic]: Start isDeterministic. Operand 44 states and 2719 transitions. [2021-12-14 16:54:47,000 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-12-14 16:54:47,000 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 44 states and 2719 transitions. [2021-12-14 16:54:47,003 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 45 states, 44 states have (on average 61.79545454545455) internal successors, (2719), 44 states have internal predecessors, (2719), 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) [2021-12-14 16:54:47,006 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 45 states, 45 states have (on average 82.0) internal successors, (3690), 45 states have internal predecessors, (3690), 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) [2021-12-14 16:54:47,007 INFO L81 ComplementDD]: Finished complementDD. Result has 45 states, 45 states have (on average 82.0) internal successors, (3690), 45 states have internal predecessors, (3690), 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) [2021-12-14 16:54:47,007 INFO L186 Difference]: Start difference. First operand has 341 places, 778 transitions, 11704 flow. Second operand 44 states and 2719 transitions. [2021-12-14 16:54:47,007 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 382 places, 1311 transitions, 22568 flow [2021-12-14 16:54:47,433 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 374 places, 1311 transitions, 21718 flow, removed 48 selfloop flow, removed 8 redundant places. [2021-12-14 16:54:47,451 INFO L242 Difference]: Finished difference. Result has 394 places, 1095 transitions, 19168 flow [2021-12-14 16:54:47,452 INFO L317 CegarLoopForPetriNet]: {PETRI_ALPHABET=82, PETRI_DIFFERENCE_MINUEND_FLOW=11175, PETRI_DIFFERENCE_MINUEND_PLACES=331, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=778, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=501, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=213, PETRI_DIFFERENCE_SUBTRAHEND_STATES=44, PETRI_FLOW=19168, PETRI_PLACES=394, PETRI_TRANSITIONS=1095} [2021-12-14 16:54:47,452 INFO L334 CegarLoopForPetriNet]: 72 programPoint places, 322 predicate places. [2021-12-14 16:54:47,452 INFO L470 AbstractCegarLoop]: Abstraction has has 394 places, 1095 transitions, 19168 flow [2021-12-14 16:54:47,452 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 59.34782608695652) internal successors, (1365), 23 states have internal predecessors, (1365), 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) [2021-12-14 16:54:47,453 INFO L246 CegarLoopForPetriNet]: Found error trace [2021-12-14 16:54:47,453 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, 1, 1, 1] [2021-12-14 16:54:47,469 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-12-14 16:54:47,653 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,10 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-14 16:54:47,653 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr1INUSE_VIOLATION] === [2021-12-14 16:54:47,654 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-14 16:54:47,654 INFO L85 PathProgramCache]: Analyzing trace with hash 1655063311, now seen corresponding path program 9 times [2021-12-14 16:54:47,654 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-14 16:54:47,654 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1777997775] [2021-12-14 16:54:47,654 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-14 16:54:47,654 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-14 16:54:47,668 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 16:54:47,738 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 6 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 16:54:47,738 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-14 16:54:47,739 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1777997775] [2021-12-14 16:54:47,739 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1777997775] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-14 16:54:47,739 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [221593186] [2021-12-14 16:54:47,739 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-12-14 16:54:47,739 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-14 16:54:47,739 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-14 16:54:47,740 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) [2021-12-14 16:54:47,771 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-12-14 16:54:47,797 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-12-14 16:54:47,797 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-14 16:54:47,798 INFO L263 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 9 conjunts are in the unsatisfiable core [2021-12-14 16:54:47,799 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-14 16:54:47,963 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 6 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 16:54:47,963 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-14 16:54:48,172 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 6 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 16:54:48,172 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [221593186] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-14 16:54:48,172 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-14 16:54:48,173 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 9] total 23 [2021-12-14 16:54:48,173 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [680245873] [2021-12-14 16:54:48,173 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-14 16:54:48,173 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2021-12-14 16:54:48,173 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-14 16:54:48,174 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-12-14 16:54:48,174 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=414, Unknown=0, NotChecked=0, Total=506 [2021-12-14 16:54:48,175 INFO L499 CegarLoopForPetriNet]: Number of universal loopers: 57 out of 82 [2021-12-14 16:54:48,175 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 394 places, 1095 transitions, 19168 flow. Second operand has 23 states, 23 states have (on average 59.34782608695652) internal successors, (1365), 23 states have internal predecessors, (1365), 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) [2021-12-14 16:54:48,175 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-12-14 16:54:48,176 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 57 of 82 [2021-12-14 16:54:48,176 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-12-14 16:54:50,474 INFO L129 PetriNetUnfolder]: 1238/3662 cut-off events. [2021-12-14 16:54:50,474 INFO L130 PetriNetUnfolder]: For 104320/104320 co-relation queries the response was YES. [2021-12-14 16:54:50,504 INFO L84 FinitePrefix]: Finished finitePrefix Result has 25738 conditions, 3662 events. 1238/3662 cut-off events. For 104320/104320 co-relation queries the response was YES. Maximal size of possible extension queue 256. Compared 31877 event pairs, 42 based on Foata normal form. 43/3688 useless extension candidates. Maximal degree in co-relation 25633. Up to 653 conditions per place. [2021-12-14 16:54:50,527 INFO L132 encePairwiseOnDemand]: 70/82 looper letters, 296 selfloop transitions, 970 changer transitions 3/1314 dead transitions. [2021-12-14 16:54:50,527 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 451 places, 1314 transitions, 24260 flow [2021-12-14 16:54:50,527 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 63 states. [2021-12-14 16:54:50,528 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2021-12-14 16:54:50,530 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 3835 transitions. [2021-12-14 16:54:50,531 INFO L544 CegarLoopForPetriNet]: DFA transition density 0.7423538521099496 [2021-12-14 16:54:50,531 INFO L72 ComplementDD]: Start complementDD. Operand 63 states and 3835 transitions. [2021-12-14 16:54:50,532 INFO L73 IsDeterministic]: Start isDeterministic. Operand 63 states and 3835 transitions. [2021-12-14 16:54:50,533 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-12-14 16:54:50,533 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 63 states and 3835 transitions. [2021-12-14 16:54:50,537 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 64 states, 63 states have (on average 60.87301587301587) internal successors, (3835), 63 states have internal predecessors, (3835), 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) [2021-12-14 16:54:50,542 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 64 states, 64 states have (on average 82.0) internal successors, (5248), 64 states have internal predecessors, (5248), 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) [2021-12-14 16:54:50,543 INFO L81 ComplementDD]: Finished complementDD. Result has 64 states, 64 states have (on average 82.0) internal successors, (5248), 64 states have internal predecessors, (5248), 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) [2021-12-14 16:54:50,543 INFO L186 Difference]: Start difference. First operand has 394 places, 1095 transitions, 19168 flow. Second operand 63 states and 3835 transitions. [2021-12-14 16:54:50,543 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 451 places, 1314 transitions, 24260 flow [2021-12-14 16:54:51,165 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 431 places, 1314 transitions, 23605 flow, removed 111 selfloop flow, removed 20 redundant places. [2021-12-14 16:54:51,186 INFO L242 Difference]: Finished difference. Result has 442 places, 1183 transitions, 22741 flow [2021-12-14 16:54:51,187 INFO L317 CegarLoopForPetriNet]: {PETRI_ALPHABET=82, PETRI_DIFFERENCE_MINUEND_FLOW=17960, PETRI_DIFFERENCE_MINUEND_PLACES=369, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=1071, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=861, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=169, PETRI_DIFFERENCE_SUBTRAHEND_STATES=63, PETRI_FLOW=22741, PETRI_PLACES=442, PETRI_TRANSITIONS=1183} [2021-12-14 16:54:51,188 INFO L334 CegarLoopForPetriNet]: 72 programPoint places, 370 predicate places. [2021-12-14 16:54:51,188 INFO L470 AbstractCegarLoop]: Abstraction has has 442 places, 1183 transitions, 22741 flow [2021-12-14 16:54:51,188 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 59.34782608695652) internal successors, (1365), 23 states have internal predecessors, (1365), 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) [2021-12-14 16:54:51,188 INFO L246 CegarLoopForPetriNet]: Found error trace [2021-12-14 16:54:51,189 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, 1, 1, 1] [2021-12-14 16:54:51,205 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-12-14 16:54:51,405 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,SelfDestructingSolverStorable12 [2021-12-14 16:54:51,405 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr1INUSE_VIOLATION] === [2021-12-14 16:54:51,405 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-14 16:54:51,406 INFO L85 PathProgramCache]: Analyzing trace with hash 108431499, now seen corresponding path program 10 times [2021-12-14 16:54:51,406 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-14 16:54:51,406 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [508493161] [2021-12-14 16:54:51,406 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-14 16:54:51,406 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-14 16:54:51,418 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 16:54:51,491 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 6 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 16:54:51,491 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-14 16:54:51,491 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [508493161] [2021-12-14 16:54:51,491 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [508493161] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-14 16:54:51,492 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1582181825] [2021-12-14 16:54:51,492 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-12-14 16:54:51,492 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-14 16:54:51,492 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-14 16:54:51,493 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) [2021-12-14 16:54:51,494 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-12-14 16:54:51,538 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-12-14 16:54:51,538 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-14 16:54:51,539 INFO L263 TraceCheckSpWp]: Trace formula consists of 138 conjuncts, 9 conjunts are in the unsatisfiable core [2021-12-14 16:54:51,540 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-14 16:54:51,750 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 6 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 16:54:51,750 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-14 16:54:51,963 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 7 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 16:54:51,964 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1582181825] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-14 16:54:51,964 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-14 16:54:51,964 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 9] total 23 [2021-12-14 16:54:51,964 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1772229858] [2021-12-14 16:54:51,964 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-14 16:54:51,964 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2021-12-14 16:54:51,965 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-14 16:54:51,965 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-12-14 16:54:51,965 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=401, Unknown=0, NotChecked=0, Total=506 [2021-12-14 16:54:51,966 INFO L499 CegarLoopForPetriNet]: Number of universal loopers: 57 out of 82 [2021-12-14 16:54:51,967 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 442 places, 1183 transitions, 22741 flow. Second operand has 23 states, 23 states have (on average 59.34782608695652) internal successors, (1365), 23 states have internal predecessors, (1365), 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) [2021-12-14 16:54:51,967 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-12-14 16:54:51,967 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 57 of 82 [2021-12-14 16:54:51,967 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-12-14 16:54:54,844 INFO L129 PetriNetUnfolder]: 1990/6158 cut-off events. [2021-12-14 16:54:54,845 INFO L130 PetriNetUnfolder]: For 235528/235528 co-relation queries the response was YES. [2021-12-14 16:54:54,900 INFO L84 FinitePrefix]: Finished finitePrefix Result has 48999 conditions, 6158 events. 1990/6158 cut-off events. For 235528/235528 co-relation queries the response was YES. Maximal size of possible extension queue 446. Compared 61327 event pairs, 89 based on Foata normal form. 9/6138 useless extension candidates. Maximal degree in co-relation 48887. Up to 1713 conditions per place. [2021-12-14 16:54:54,939 INFO L132 encePairwiseOnDemand]: 70/82 looper letters, 1224 selfloop transitions, 671 changer transitions 16/1956 dead transitions. [2021-12-14 16:54:54,939 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 485 places, 1956 transitions, 41297 flow [2021-12-14 16:54:54,940 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2021-12-14 16:54:54,940 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2021-12-14 16:54:54,941 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 2793 transitions. [2021-12-14 16:54:54,942 INFO L544 CegarLoopForPetriNet]: DFA transition density 0.7569105691056911 [2021-12-14 16:54:54,943 INFO L72 ComplementDD]: Start complementDD. Operand 45 states and 2793 transitions. [2021-12-14 16:54:54,943 INFO L73 IsDeterministic]: Start isDeterministic. Operand 45 states and 2793 transitions. [2021-12-14 16:54:54,943 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-12-14 16:54:54,944 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 45 states and 2793 transitions. [2021-12-14 16:54:54,947 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 46 states, 45 states have (on average 62.06666666666667) internal successors, (2793), 45 states have internal predecessors, (2793), 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) [2021-12-14 16:54:54,950 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 46 states, 46 states have (on average 82.0) internal successors, (3772), 46 states have internal predecessors, (3772), 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) [2021-12-14 16:54:54,951 INFO L81 ComplementDD]: Finished complementDD. Result has 46 states, 46 states have (on average 82.0) internal successors, (3772), 46 states have internal predecessors, (3772), 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) [2021-12-14 16:54:54,951 INFO L186 Difference]: Start difference. First operand has 442 places, 1183 transitions, 22741 flow. Second operand 45 states and 2793 transitions. [2021-12-14 16:54:54,951 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 485 places, 1956 transitions, 41297 flow [2021-12-14 16:54:56,699 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 449 places, 1956 transitions, 40421 flow, removed 108 selfloop flow, removed 36 redundant places. [2021-12-14 16:54:56,737 INFO L242 Difference]: Finished difference. Result has 475 places, 1656 transitions, 34486 flow [2021-12-14 16:54:56,738 INFO L317 CegarLoopForPetriNet]: {PETRI_ALPHABET=82, PETRI_DIFFERENCE_MINUEND_FLOW=22087, PETRI_DIFFERENCE_MINUEND_PLACES=405, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=1183, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=262, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=724, PETRI_DIFFERENCE_SUBTRAHEND_STATES=45, PETRI_FLOW=34486, PETRI_PLACES=475, PETRI_TRANSITIONS=1656} [2021-12-14 16:54:56,739 INFO L334 CegarLoopForPetriNet]: 72 programPoint places, 403 predicate places. [2021-12-14 16:54:56,739 INFO L470 AbstractCegarLoop]: Abstraction has has 475 places, 1656 transitions, 34486 flow [2021-12-14 16:54:56,739 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 59.34782608695652) internal successors, (1365), 23 states have internal predecessors, (1365), 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) [2021-12-14 16:54:56,739 INFO L246 CegarLoopForPetriNet]: Found error trace [2021-12-14 16:54:56,739 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, 1, 1, 1] [2021-12-14 16:54:56,758 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-12-14 16:54:56,958 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,SelfDestructingSolverStorable13 [2021-12-14 16:54:56,958 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr1INUSE_VIOLATION] === [2021-12-14 16:54:56,958 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-14 16:54:56,958 INFO L85 PathProgramCache]: Analyzing trace with hash 1303336741, now seen corresponding path program 11 times [2021-12-14 16:54:56,958 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-14 16:54:56,959 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1130920538] [2021-12-14 16:54:56,959 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-14 16:54:56,959 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-14 16:54:56,970 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 16:54:57,033 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 6 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 16:54:57,034 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-14 16:54:57,034 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1130920538] [2021-12-14 16:54:57,034 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1130920538] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-14 16:54:57,034 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [204710076] [2021-12-14 16:54:57,034 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-12-14 16:54:57,034 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-14 16:54:57,035 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-14 16:54:57,035 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) [2021-12-14 16:54:57,041 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-12-14 16:54:57,084 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2021-12-14 16:54:57,084 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-14 16:54:57,085 INFO L263 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 9 conjunts are in the unsatisfiable core [2021-12-14 16:54:57,086 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-14 16:54:57,261 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 6 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 16:54:57,261 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-14 16:54:57,456 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 6 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 16:54:57,457 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [204710076] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-14 16:54:57,457 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-14 16:54:57,457 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 9] total 24 [2021-12-14 16:54:57,457 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [367988689] [2021-12-14 16:54:57,457 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-14 16:54:57,457 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2021-12-14 16:54:57,457 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-14 16:54:57,458 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-12-14 16:54:57,458 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=98, Invalid=454, Unknown=0, NotChecked=0, Total=552 [2021-12-14 16:54:57,459 INFO L499 CegarLoopForPetriNet]: Number of universal loopers: 57 out of 82 [2021-12-14 16:54:57,459 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 475 places, 1656 transitions, 34486 flow. Second operand has 24 states, 24 states have (on average 59.291666666666664) internal successors, (1423), 24 states have internal predecessors, (1423), 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) [2021-12-14 16:54:57,460 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-12-14 16:54:57,460 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 57 of 82 [2021-12-14 16:54:57,460 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-12-14 16:55:01,108 INFO L129 PetriNetUnfolder]: 2238/6842 cut-off events. [2021-12-14 16:55:01,108 INFO L130 PetriNetUnfolder]: For 369460/369460 co-relation queries the response was YES. [2021-12-14 16:55:01,191 INFO L84 FinitePrefix]: Finished finitePrefix Result has 60917 conditions, 6842 events. 2238/6842 cut-off events. For 369460/369460 co-relation queries the response was YES. Maximal size of possible extension queue 497. Compared 69113 event pairs, 167 based on Foata normal form. 1/6820 useless extension candidates. Maximal degree in co-relation 60781. Up to 2911 conditions per place. [2021-12-14 16:55:01,235 INFO L132 encePairwiseOnDemand]: 70/82 looper letters, 1463 selfloop transitions, 438 changer transitions 6/1952 dead transitions. [2021-12-14 16:55:01,235 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 500 places, 1952 transitions, 44351 flow [2021-12-14 16:55:01,236 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-12-14 16:55:01,236 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2021-12-14 16:55:01,237 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 1655 transitions. [2021-12-14 16:55:01,238 INFO L544 CegarLoopForPetriNet]: DFA transition density 0.7475158084914183 [2021-12-14 16:55:01,238 INFO L72 ComplementDD]: Start complementDD. Operand 27 states and 1655 transitions. [2021-12-14 16:55:01,238 INFO L73 IsDeterministic]: Start isDeterministic. Operand 27 states and 1655 transitions. [2021-12-14 16:55:01,238 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-12-14 16:55:01,238 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 27 states and 1655 transitions. [2021-12-14 16:55:01,240 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 28 states, 27 states have (on average 61.2962962962963) internal successors, (1655), 27 states have internal predecessors, (1655), 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) [2021-12-14 16:55:01,242 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 28 states, 28 states have (on average 82.0) internal successors, (2296), 28 states have internal predecessors, (2296), 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) [2021-12-14 16:55:01,243 INFO L81 ComplementDD]: Finished complementDD. Result has 28 states, 28 states have (on average 82.0) internal successors, (2296), 28 states have internal predecessors, (2296), 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) [2021-12-14 16:55:01,243 INFO L186 Difference]: Start difference. First operand has 475 places, 1656 transitions, 34486 flow. Second operand 27 states and 1655 transitions. [2021-12-14 16:55:01,243 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 500 places, 1952 transitions, 44351 flow [2021-12-14 16:55:04,211 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 490 places, 1952 transitions, 43061 flow, removed 324 selfloop flow, removed 10 redundant places. [2021-12-14 16:55:04,261 INFO L242 Difference]: Finished difference. Result has 506 places, 1796 transitions, 38021 flow [2021-12-14 16:55:04,263 INFO L317 CegarLoopForPetriNet]: {PETRI_ALPHABET=82, PETRI_DIFFERENCE_MINUEND_FLOW=33343, PETRI_DIFFERENCE_MINUEND_PLACES=464, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=1656, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=298, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=1246, PETRI_DIFFERENCE_SUBTRAHEND_STATES=27, PETRI_FLOW=38021, PETRI_PLACES=506, PETRI_TRANSITIONS=1796} [2021-12-14 16:55:04,263 INFO L334 CegarLoopForPetriNet]: 72 programPoint places, 434 predicate places. [2021-12-14 16:55:04,263 INFO L470 AbstractCegarLoop]: Abstraction has has 506 places, 1796 transitions, 38021 flow [2021-12-14 16:55:04,264 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 59.291666666666664) internal successors, (1423), 24 states have internal predecessors, (1423), 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) [2021-12-14 16:55:04,264 INFO L246 CegarLoopForPetriNet]: Found error trace [2021-12-14 16:55:04,264 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, 1, 1, 1] [2021-12-14 16:55:04,280 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Ended with exit code 0 [2021-12-14 16:55:04,479 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,SelfDestructingSolverStorable14 [2021-12-14 16:55:04,479 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr1INUSE_VIOLATION] === [2021-12-14 16:55:04,480 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-14 16:55:04,480 INFO L85 PathProgramCache]: Analyzing trace with hash 1738579305, now seen corresponding path program 12 times [2021-12-14 16:55:04,480 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-14 16:55:04,480 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1599109718] [2021-12-14 16:55:04,480 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-14 16:55:04,480 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-14 16:55:04,492 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 16:55:04,551 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 6 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 16:55:04,551 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-14 16:55:04,551 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1599109718] [2021-12-14 16:55:04,551 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1599109718] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-14 16:55:04,552 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [182639106] [2021-12-14 16:55:04,552 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-12-14 16:55:04,552 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-14 16:55:04,552 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-14 16:55:04,553 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) [2021-12-14 16:55:04,553 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-12-14 16:55:04,598 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 4 check-sat command(s) [2021-12-14 16:55:04,598 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-14 16:55:04,599 INFO L263 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 9 conjunts are in the unsatisfiable core [2021-12-14 16:55:04,600 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-14 16:55:04,770 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 6 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 16:55:04,770 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-14 16:55:04,953 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 6 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 16:55:04,953 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [182639106] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-14 16:55:04,953 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-14 16:55:04,953 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 9] total 24 [2021-12-14 16:55:04,953 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [323999369] [2021-12-14 16:55:04,953 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-14 16:55:04,954 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2021-12-14 16:55:04,954 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-14 16:55:04,954 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-12-14 16:55:04,954 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=100, Invalid=452, Unknown=0, NotChecked=0, Total=552 [2021-12-14 16:55:04,955 INFO L499 CegarLoopForPetriNet]: Number of universal loopers: 57 out of 82 [2021-12-14 16:55:04,956 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 506 places, 1796 transitions, 38021 flow. Second operand has 24 states, 24 states have (on average 59.291666666666664) internal successors, (1423), 24 states have internal predecessors, (1423), 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) [2021-12-14 16:55:04,956 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-12-14 16:55:04,956 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 57 of 82 [2021-12-14 16:55:04,956 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-12-14 16:55:10,565 INFO L129 PetriNetUnfolder]: 2969/9466 cut-off events. [2021-12-14 16:55:10,566 INFO L130 PetriNetUnfolder]: For 542766/542766 co-relation queries the response was YES. [2021-12-14 16:55:10,663 INFO L84 FinitePrefix]: Finished finitePrefix Result has 84294 conditions, 9466 events. 2969/9466 cut-off events. For 542766/542766 co-relation queries the response was YES. Maximal size of possible extension queue 671. Compared 103510 event pairs, 187 based on Foata normal form. 6/9431 useless extension candidates. Maximal degree in co-relation 84145. Up to 2695 conditions per place. [2021-12-14 16:55:10,891 INFO L132 encePairwiseOnDemand]: 70/82 looper letters, 1576 selfloop transitions, 1018 changer transitions 4/2643 dead transitions. [2021-12-14 16:55:10,891 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 562 places, 2643 transitions, 60823 flow [2021-12-14 16:55:10,892 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2021-12-14 16:55:10,892 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2021-12-14 16:55:10,893 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 3669 transitions. [2021-12-14 16:55:10,894 INFO L544 CegarLoopForPetriNet]: DFA transition density 0.7457317073170732 [2021-12-14 16:55:10,894 INFO L72 ComplementDD]: Start complementDD. Operand 60 states and 3669 transitions. [2021-12-14 16:55:10,894 INFO L73 IsDeterministic]: Start isDeterministic. Operand 60 states and 3669 transitions. [2021-12-14 16:55:10,895 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-12-14 16:55:10,895 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 60 states and 3669 transitions. [2021-12-14 16:55:10,899 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 61 states, 60 states have (on average 61.15) internal successors, (3669), 60 states have internal predecessors, (3669), 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) [2021-12-14 16:55:10,903 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 61 states, 61 states have (on average 82.0) internal successors, (5002), 61 states have internal predecessors, (5002), 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) [2021-12-14 16:55:10,904 INFO L81 ComplementDD]: Finished complementDD. Result has 61 states, 61 states have (on average 82.0) internal successors, (5002), 61 states have internal predecessors, (5002), 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) [2021-12-14 16:55:10,904 INFO L186 Difference]: Start difference. First operand has 506 places, 1796 transitions, 38021 flow. Second operand 60 states and 3669 transitions. [2021-12-14 16:55:10,904 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 562 places, 2643 transitions, 60823 flow [2021-12-14 16:55:15,439 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 553 places, 2643 transitions, 60731 flow, removed 19 selfloop flow, removed 9 redundant places. [2021-12-14 16:55:15,488 INFO L242 Difference]: Finished difference. Result has 581 places, 2280 transitions, 53290 flow [2021-12-14 16:55:15,489 INFO L317 CegarLoopForPetriNet]: {PETRI_ALPHABET=82, PETRI_DIFFERENCE_MINUEND_FLOW=37931, PETRI_DIFFERENCE_MINUEND_PLACES=494, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=1796, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=580, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=1020, PETRI_DIFFERENCE_SUBTRAHEND_STATES=60, PETRI_FLOW=53290, PETRI_PLACES=581, PETRI_TRANSITIONS=2280} [2021-12-14 16:55:15,490 INFO L334 CegarLoopForPetriNet]: 72 programPoint places, 509 predicate places. [2021-12-14 16:55:15,490 INFO L470 AbstractCegarLoop]: Abstraction has has 581 places, 2280 transitions, 53290 flow [2021-12-14 16:55:15,490 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 59.291666666666664) internal successors, (1423), 24 states have internal predecessors, (1423), 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) [2021-12-14 16:55:15,490 INFO L246 CegarLoopForPetriNet]: Found error trace [2021-12-14 16:55:15,491 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, 1, 1, 1] [2021-12-14 16:55:15,509 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-12-14 16:55:15,706 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,SelfDestructingSolverStorable15 [2021-12-14 16:55:15,707 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr1INUSE_VIOLATION] === [2021-12-14 16:55:15,707 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-14 16:55:15,707 INFO L85 PathProgramCache]: Analyzing trace with hash -1479700621, now seen corresponding path program 13 times [2021-12-14 16:55:15,707 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-14 16:55:15,707 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [293621477] [2021-12-14 16:55:15,707 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-14 16:55:15,707 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-14 16:55:15,716 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 16:55:15,772 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 6 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 16:55:15,773 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-14 16:55:15,773 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [293621477] [2021-12-14 16:55:15,773 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [293621477] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-14 16:55:15,773 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [337028738] [2021-12-14 16:55:15,773 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-12-14 16:55:15,773 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-14 16:55:15,773 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-14 16:55:15,774 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) [2021-12-14 16:55:15,779 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-12-14 16:55:15,822 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 16:55:15,823 INFO L263 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 9 conjunts are in the unsatisfiable core [2021-12-14 16:55:15,824 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-14 16:55:15,974 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 6 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 16:55:15,975 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-14 16:55:16,143 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 6 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 16:55:16,143 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [337028738] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-14 16:55:16,143 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-14 16:55:16,144 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 9] total 24 [2021-12-14 16:55:16,144 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [757124450] [2021-12-14 16:55:16,144 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-14 16:55:16,144 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2021-12-14 16:55:16,144 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-14 16:55:16,145 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-12-14 16:55:16,145 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=445, Unknown=0, NotChecked=0, Total=552 [2021-12-14 16:55:16,145 INFO L499 CegarLoopForPetriNet]: Number of universal loopers: 57 out of 82 [2021-12-14 16:55:16,146 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 581 places, 2280 transitions, 53290 flow. Second operand has 24 states, 24 states have (on average 59.291666666666664) internal successors, (1423), 24 states have internal predecessors, (1423), 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) [2021-12-14 16:55:16,146 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-12-14 16:55:16,146 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 57 of 82 [2021-12-14 16:55:16,146 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-12-14 16:55:22,186 INFO L129 PetriNetUnfolder]: 2970/9376 cut-off events. [2021-12-14 16:55:22,186 INFO L130 PetriNetUnfolder]: For 642942/642942 co-relation queries the response was YES. [2021-12-14 16:55:22,313 INFO L84 FinitePrefix]: Finished finitePrefix Result has 90315 conditions, 9376 events. 2970/9376 cut-off events. For 642942/642942 co-relation queries the response was YES. Maximal size of possible extension queue 673. Compared 101920 event pairs, 222 based on Foata normal form. 1/9346 useless extension candidates. Maximal degree in co-relation 90140. Up to 4359 conditions per place. [2021-12-14 16:55:22,364 INFO L132 encePairwiseOnDemand]: 70/82 looper letters, 1848 selfloop transitions, 416 changer transitions 5/2314 dead transitions. [2021-12-14 16:55:22,365 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 595 places, 2314 transitions, 58575 flow [2021-12-14 16:55:22,365 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-12-14 16:55:22,365 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2021-12-14 16:55:22,365 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 1100 transitions. [2021-12-14 16:55:22,366 INFO L544 CegarLoopForPetriNet]: DFA transition density 0.7452574525745257 [2021-12-14 16:55:22,366 INFO L72 ComplementDD]: Start complementDD. Operand 18 states and 1100 transitions. [2021-12-14 16:55:22,366 INFO L73 IsDeterministic]: Start isDeterministic. Operand 18 states and 1100 transitions. [2021-12-14 16:55:22,366 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-12-14 16:55:22,366 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 18 states and 1100 transitions. [2021-12-14 16:55:22,367 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 19 states, 18 states have (on average 61.111111111111114) internal successors, (1100), 18 states have internal predecessors, (1100), 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) [2021-12-14 16:55:22,368 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 19 states, 19 states have (on average 82.0) internal successors, (1558), 19 states have internal predecessors, (1558), 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) [2021-12-14 16:55:22,368 INFO L81 ComplementDD]: Finished complementDD. Result has 19 states, 19 states have (on average 82.0) internal successors, (1558), 19 states have internal predecessors, (1558), 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) [2021-12-14 16:55:22,368 INFO L186 Difference]: Start difference. First operand has 581 places, 2280 transitions, 53290 flow. Second operand 18 states and 1100 transitions. [2021-12-14 16:55:22,368 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 595 places, 2314 transitions, 58575 flow [2021-12-14 16:55:28,672 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 577 places, 2314 transitions, 58009 flow, removed 232 selfloop flow, removed 18 redundant places. [2021-12-14 16:55:28,719 INFO L242 Difference]: Finished difference. Result has 582 places, 2283 transitions, 53925 flow [2021-12-14 16:55:28,721 INFO L317 CegarLoopForPetriNet]: {PETRI_ALPHABET=82, PETRI_DIFFERENCE_MINUEND_FLOW=52726, PETRI_DIFFERENCE_MINUEND_PLACES=560, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=2280, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=413, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=1866, PETRI_DIFFERENCE_SUBTRAHEND_STATES=18, PETRI_FLOW=53925, PETRI_PLACES=582, PETRI_TRANSITIONS=2283} [2021-12-14 16:55:28,721 INFO L334 CegarLoopForPetriNet]: 72 programPoint places, 510 predicate places. [2021-12-14 16:55:28,721 INFO L470 AbstractCegarLoop]: Abstraction has has 582 places, 2283 transitions, 53925 flow [2021-12-14 16:55:28,721 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 59.291666666666664) internal successors, (1423), 24 states have internal predecessors, (1423), 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) [2021-12-14 16:55:28,722 INFO L246 CegarLoopForPetriNet]: Found error trace [2021-12-14 16:55:28,722 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, 1, 1, 1] [2021-12-14 16:55:28,737 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2021-12-14 16:55:28,922 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16,15 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-14 16:55:28,922 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr1INUSE_VIOLATION] === [2021-12-14 16:55:28,923 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-14 16:55:28,923 INFO L85 PathProgramCache]: Analyzing trace with hash -456514995, now seen corresponding path program 14 times [2021-12-14 16:55:28,923 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-14 16:55:28,923 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [574999973] [2021-12-14 16:55:28,923 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-14 16:55:28,923 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-14 16:55:28,931 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 16:55:29,000 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 6 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 16:55:29,000 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-14 16:55:29,001 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [574999973] [2021-12-14 16:55:29,001 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [574999973] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-14 16:55:29,001 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1119638676] [2021-12-14 16:55:29,001 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-14 16:55:29,001 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-14 16:55:29,001 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-14 16:55:29,003 INFO L229 MonitoredProcess]: Starting monitored process 16 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-14 16:55:29,005 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2021-12-14 16:55:29,056 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-14 16:55:29,056 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-14 16:55:29,057 INFO L263 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 9 conjunts are in the unsatisfiable core [2021-12-14 16:55:29,058 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-14 16:55:29,210 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 6 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 16:55:29,210 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-14 16:55:29,370 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 6 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 16:55:29,370 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1119638676] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-14 16:55:29,370 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-14 16:55:29,370 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 9] total 23 [2021-12-14 16:55:29,370 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1524004255] [2021-12-14 16:55:29,370 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-14 16:55:29,371 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2021-12-14 16:55:29,371 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-14 16:55:29,371 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-12-14 16:55:29,371 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=103, Invalid=403, Unknown=0, NotChecked=0, Total=506 [2021-12-14 16:55:29,372 INFO L499 CegarLoopForPetriNet]: Number of universal loopers: 57 out of 82 [2021-12-14 16:55:29,373 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 582 places, 2283 transitions, 53925 flow. Second operand has 23 states, 23 states have (on average 59.34782608695652) internal successors, (1365), 23 states have internal predecessors, (1365), 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) [2021-12-14 16:55:29,373 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-12-14 16:55:29,373 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 57 of 82 [2021-12-14 16:55:29,373 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-12-14 16:55:36,548 INFO L129 PetriNetUnfolder]: 2976/9557 cut-off events. [2021-12-14 16:55:36,549 INFO L130 PetriNetUnfolder]: For 676470/676470 co-relation queries the response was YES. [2021-12-14 16:55:36,675 INFO L84 FinitePrefix]: Finished finitePrefix Result has 92581 conditions, 9557 events. 2976/9557 cut-off events. For 676470/676470 co-relation queries the response was YES. Maximal size of possible extension queue 686. Compared 104941 event pairs, 211 based on Foata normal form. 79/9599 useless extension candidates. Maximal degree in co-relation 92407. Up to 1439 conditions per place. [2021-12-14 16:55:36,727 INFO L132 encePairwiseOnDemand]: 70/82 looper letters, 811 selfloop transitions, 1740 changer transitions 6/2602 dead transitions. [2021-12-14 16:55:36,727 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 629 places, 2602 transitions, 65181 flow [2021-12-14 16:55:36,727 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2021-12-14 16:55:36,727 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2021-12-14 16:55:36,729 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 3626 transitions. [2021-12-14 16:55:36,729 INFO L544 CegarLoopForPetriNet]: DFA transition density 0.7494832575444399 [2021-12-14 16:55:36,730 INFO L72 ComplementDD]: Start complementDD. Operand 59 states and 3626 transitions. [2021-12-14 16:55:36,730 INFO L73 IsDeterministic]: Start isDeterministic. Operand 59 states and 3626 transitions. [2021-12-14 16:55:36,730 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-12-14 16:55:36,730 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 59 states and 3626 transitions. [2021-12-14 16:55:36,734 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 60 states, 59 states have (on average 61.45762711864407) internal successors, (3626), 59 states have internal predecessors, (3626), 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) [2021-12-14 16:55:36,737 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 60 states, 60 states have (on average 82.0) internal successors, (4920), 60 states have internal predecessors, (4920), 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) [2021-12-14 16:55:36,738 INFO L81 ComplementDD]: Finished complementDD. Result has 60 states, 60 states have (on average 82.0) internal successors, (4920), 60 states have internal predecessors, (4920), 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) [2021-12-14 16:55:36,738 INFO L186 Difference]: Start difference. First operand has 582 places, 2283 transitions, 53925 flow. Second operand 59 states and 3626 transitions. [2021-12-14 16:55:36,738 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 629 places, 2602 transitions, 65181 flow