./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/array-examples/sanfoundry_27_ground.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 57096758 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/config/AutomizerReach.xml -i ../../sv-benchmarks/c/array-examples/sanfoundry_27_ground.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/config/svcomp-Reach-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3 --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 992823d82462469458f99b979532c5f9f46cefb5 .................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................. Execution finished normally Using bit-precise analysis Retrying with bit-precise analysis Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/config/AutomizerReach.xml -i ../../sv-benchmarks/c/array-examples/sanfoundry_27_ground.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/config/svcomp-Reach-32bit-Automizer_Bitvector.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3 --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 992823d82462469458f99b979532c5f9f46cefb5 ......................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... Execution finished normally Writing output log to file Ultimate.log Result: UNKNOWN --- Real Ultimate output --- This is Ultimate 0.2.1-dev-5709675 [2021-10-15 20:27:25,695 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-10-15 20:27:25,699 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-10-15 20:27:25,770 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-10-15 20:27:25,771 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-10-15 20:27:25,776 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-10-15 20:27:25,779 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-10-15 20:27:25,784 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-10-15 20:27:25,788 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-10-15 20:27:25,795 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-10-15 20:27:25,796 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-10-15 20:27:25,799 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-10-15 20:27:25,800 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-10-15 20:27:25,803 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-10-15 20:27:25,805 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-10-15 20:27:25,811 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-10-15 20:27:25,813 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-10-15 20:27:25,815 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-10-15 20:27:25,818 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-10-15 20:27:25,828 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-10-15 20:27:25,831 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-10-15 20:27:25,833 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-10-15 20:27:25,837 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-10-15 20:27:25,838 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-10-15 20:27:25,850 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-10-15 20:27:25,850 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-10-15 20:27:25,851 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-10-15 20:27:25,854 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-10-15 20:27:25,855 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-10-15 20:27:25,857 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-10-15 20:27:25,857 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-10-15 20:27:25,858 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-10-15 20:27:25,861 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-10-15 20:27:25,863 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-10-15 20:27:25,865 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-10-15 20:27:25,866 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-10-15 20:27:25,867 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-10-15 20:27:25,867 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-10-15 20:27:25,867 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-10-15 20:27:25,869 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-10-15 20:27:25,870 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-10-15 20:27:25,871 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/config/svcomp-Reach-32bit-Automizer_Default.epf [2021-10-15 20:27:25,926 INFO L113 SettingsManager]: Loading preferences was successful [2021-10-15 20:27:25,926 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-10-15 20:27:25,927 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-10-15 20:27:25,927 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-10-15 20:27:25,929 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-10-15 20:27:25,930 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-10-15 20:27:25,930 INFO L138 SettingsManager]: * Use SBE=true [2021-10-15 20:27:25,930 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-10-15 20:27:25,931 INFO L138 SettingsManager]: * sizeof long=4 [2021-10-15 20:27:25,931 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-10-15 20:27:25,932 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-10-15 20:27:25,932 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-10-15 20:27:25,933 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-10-15 20:27:25,933 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-10-15 20:27:25,933 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-10-15 20:27:25,934 INFO L138 SettingsManager]: * sizeof long double=12 [2021-10-15 20:27:25,934 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-10-15 20:27:25,934 INFO L138 SettingsManager]: * Use constant arrays=true [2021-10-15 20:27:25,934 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-10-15 20:27:25,935 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-10-15 20:27:25,935 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-10-15 20:27:25,935 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-10-15 20:27:25,936 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-10-15 20:27:25,936 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-10-15 20:27:25,936 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-10-15 20:27:25,936 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-10-15 20:27:25,937 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-10-15 20:27:25,937 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-10-15 20:27:25,937 INFO L138 SettingsManager]: * Large block encoding in concurrent analysis=OFF [2021-10-15 20:27:25,939 INFO L138 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2021-10-15 20:27:25,939 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-10-15 20:27:25,940 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-10-15 20:27:25,940 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:/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 992823d82462469458f99b979532c5f9f46cefb5 [2021-10-15 20:27:26,245 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-10-15 20:27:26,281 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-10-15 20:27:26,284 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-10-15 20:27:26,286 INFO L271 PluginConnector]: Initializing CDTParser... [2021-10-15 20:27:26,287 INFO L275 PluginConnector]: CDTParser initialized [2021-10-15 20:27:26,288 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/../../sv-benchmarks/c/array-examples/sanfoundry_27_ground.i [2021-10-15 20:27:26,385 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/data/986f87ae4/e5b9dbba93414e958c1997ef75007e86/FLAG097091dbd [2021-10-15 20:27:27,058 INFO L306 CDTParser]: Found 1 translation units. [2021-10-15 20:27:27,060 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/sv-benchmarks/c/array-examples/sanfoundry_27_ground.i [2021-10-15 20:27:27,074 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/data/986f87ae4/e5b9dbba93414e958c1997ef75007e86/FLAG097091dbd [2021-10-15 20:27:27,401 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/data/986f87ae4/e5b9dbba93414e958c1997ef75007e86 [2021-10-15 20:27:27,404 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-10-15 20:27:27,406 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-10-15 20:27:27,420 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-10-15 20:27:27,421 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-10-15 20:27:27,425 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-10-15 20:27:27,426 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 15.10 08:27:27" (1/1) ... [2021-10-15 20:27:27,427 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4e2fa428 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 08:27:27, skipping insertion in model container [2021-10-15 20:27:27,428 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 15.10 08:27:27" (1/1) ... [2021-10-15 20:27:27,436 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-10-15 20:27:27,460 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-10-15 20:27:27,653 WARN L228 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/sv-benchmarks/c/array-examples/sanfoundry_27_ground.i[813,826] [2021-10-15 20:27:27,672 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-10-15 20:27:27,681 INFO L203 MainTranslator]: Completed pre-run [2021-10-15 20:27:27,697 WARN L228 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/sv-benchmarks/c/array-examples/sanfoundry_27_ground.i[813,826] [2021-10-15 20:27:27,705 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-10-15 20:27:27,721 INFO L208 MainTranslator]: Completed translation [2021-10-15 20:27:27,721 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 08:27:27 WrapperNode [2021-10-15 20:27:27,722 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-10-15 20:27:27,723 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-10-15 20:27:27,723 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-10-15 20:27:27,724 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-10-15 20:27:27,732 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 08:27:27" (1/1) ... [2021-10-15 20:27:27,740 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 08:27:27" (1/1) ... [2021-10-15 20:27:27,762 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-10-15 20:27:27,763 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-10-15 20:27:27,764 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-10-15 20:27:27,764 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-10-15 20:27:27,773 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 08:27:27" (1/1) ... [2021-10-15 20:27:27,774 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 08:27:27" (1/1) ... [2021-10-15 20:27:27,776 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 08:27:27" (1/1) ... [2021-10-15 20:27:27,776 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 08:27:27" (1/1) ... [2021-10-15 20:27:27,782 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 08:27:27" (1/1) ... [2021-10-15 20:27:27,787 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 08:27:27" (1/1) ... [2021-10-15 20:27:27,789 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 08:27:27" (1/1) ... [2021-10-15 20:27:27,791 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-10-15 20:27:27,792 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-10-15 20:27:27,792 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-10-15 20:27:27,792 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-10-15 20:27:27,794 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 08:27:27" (1/1) ... [2021-10-15 20:27:27,808 INFO L170 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-10-15 20:27:27,821 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/z3 [2021-10-15 20:27:27,842 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-10-15 20:27:27,860 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-10-15 20:27:27,892 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-10-15 20:27:27,892 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-10-15 20:27:27,892 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-10-15 20:27:27,892 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-10-15 20:27:27,893 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-10-15 20:27:27,893 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-10-15 20:27:27,893 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-10-15 20:27:28,126 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-10-15 20:27:28,126 INFO L299 CfgBuilder]: Removed 9 assume(true) statements. [2021-10-15 20:27:28,129 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 15.10 08:27:28 BoogieIcfgContainer [2021-10-15 20:27:28,129 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-10-15 20:27:28,131 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-10-15 20:27:28,131 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-10-15 20:27:28,135 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-10-15 20:27:28,135 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 15.10 08:27:27" (1/3) ... [2021-10-15 20:27:28,136 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7e6e907f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 15.10 08:27:28, skipping insertion in model container [2021-10-15 20:27:28,136 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 08:27:27" (2/3) ... [2021-10-15 20:27:28,137 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7e6e907f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 15.10 08:27:28, skipping insertion in model container [2021-10-15 20:27:28,137 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 15.10 08:27:28" (3/3) ... [2021-10-15 20:27:28,139 INFO L111 eAbstractionObserver]: Analyzing ICFG sanfoundry_27_ground.i [2021-10-15 20:27:28,145 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-10-15 20:27:28,146 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-10-15 20:27:28,206 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-10-15 20:27:28,214 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, mConcurrency=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 [2021-10-15 20:27:28,214 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-10-15 20:27:28,227 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 19 places, 26 transitions, 52 flow [2021-10-15 20:27:28,253 INFO L129 PetriNetUnfolder]: 8/26 cut-off events. [2021-10-15 20:27:28,253 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-10-15 20:27:28,255 INFO L84 FinitePrefix]: Finished finitePrefix Result has 27 conditions, 26 events. 8/26 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 3. Compared 28 event pairs, 0 based on Foata normal form. 0/17 useless extension candidates. Maximal degree in co-relation 0. Up to 2 conditions per place. [2021-10-15 20:27:28,256 INFO L82 GeneralOperation]: Start removeDead. Operand has 19 places, 26 transitions, 52 flow [2021-10-15 20:27:28,261 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 15 places, 21 transitions, 42 flow [2021-10-15 20:27:28,266 INFO L129 PetriNetUnfolder]: 7/20 cut-off events. [2021-10-15 20:27:28,266 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-10-15 20:27:28,266 INFO L246 CegarLoopForPetriNet]: Found error trace [2021-10-15 20:27:28,267 INFO L254 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-15 20:27:28,268 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-15 20:27:28,274 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-15 20:27:28,274 INFO L82 PathProgramCache]: Analyzing trace with hash -986241125, now seen corresponding path program 1 times [2021-10-15 20:27:28,286 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-15 20:27:28,286 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1536186475] [2021-10-15 20:27:28,287 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-15 20:27:28,288 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-15 20:27:28,399 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-15 20:27:28,486 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-15 20:27:28,487 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-15 20:27:28,488 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1536186475] [2021-10-15 20:27:28,490 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1536186475] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-15 20:27:28,490 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-15 20:27:28,491 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-10-15 20:27:28,493 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1234092668] [2021-10-15 20:27:28,507 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2021-10-15 20:27:28,508 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-15 20:27:28,525 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-10-15 20:27:28,529 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-10-15 20:27:28,547 INFO L499 CegarLoopForPetriNet]: Number of universal loopers: 22 out of 26 [2021-10-15 20:27:28,551 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 15 places, 21 transitions, 42 flow. Second operand has 2 states, 2 states have (on average 22.5) internal successors, (45), 2 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-15 20:27:28,551 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-10-15 20:27:28,552 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 22 of 26 [2021-10-15 20:27:28,554 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-10-15 20:27:28,575 INFO L129 PetriNetUnfolder]: 4/18 cut-off events. [2021-10-15 20:27:28,576 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-10-15 20:27:28,578 INFO L84 FinitePrefix]: Finished finitePrefix Result has 20 conditions, 18 events. 4/18 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 2. Compared 13 event pairs, 0 based on Foata normal form. 3/17 useless extension candidates. Maximal degree in co-relation 18. Up to 2 conditions per place. [2021-10-15 20:27:28,580 INFO L132 encePairwiseOnDemand]: 23/26 looper letters, 0 selfloop transitions, 0 changer transitions 0/18 dead transitions. [2021-10-15 20:27:28,581 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 16 places, 18 transitions, 36 flow [2021-10-15 20:27:28,581 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-10-15 20:27:28,584 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2 states. [2021-10-15 20:27:28,592 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2 states to 2 states and 47 transitions. [2021-10-15 20:27:28,595 INFO L544 CegarLoopForPetriNet]: DFA transition density 0.9038461538461539 [2021-10-15 20:27:28,596 INFO L72 ComplementDD]: Start complementDD. Operand 2 states and 47 transitions. [2021-10-15 20:27:28,597 INFO L73 IsDeterministic]: Start isDeterministic. Operand 2 states and 47 transitions. [2021-10-15 20:27:28,598 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-10-15 20:27:28,609 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 2 states and 47 transitions. [2021-10-15 20:27:28,611 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 3 states, 2 states have (on average 23.5) internal successors, (47), 2 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-15 20:27:28,617 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 3 states, 3 states have (on average 26.0) internal successors, (78), 3 states have internal predecessors, (78), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-15 20:27:28,617 INFO L81 ComplementDD]: Finished complementDD. Result has 3 states, 3 states have (on average 26.0) internal successors, (78), 3 states have internal predecessors, (78), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-15 20:27:28,620 INFO L186 Difference]: Start difference. First operand has 15 places, 21 transitions, 42 flow. Second operand 2 states and 47 transitions. [2021-10-15 20:27:28,621 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 16 places, 18 transitions, 36 flow [2021-10-15 20:27:28,623 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 16 places, 18 transitions, 36 flow, removed 0 selfloop flow, removed 0 redundant places. [2021-10-15 20:27:28,626 INFO L242 Difference]: Finished difference. Result has 16 places, 18 transitions, 36 flow [2021-10-15 20:27:28,628 INFO L317 CegarLoopForPetriNet]: {PETRI_ALPHABET=26, PETRI_DIFFERENCE_MINUEND_FLOW=36, PETRI_DIFFERENCE_MINUEND_PLACES=15, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=18, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=0, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=18, PETRI_DIFFERENCE_SUBTRAHEND_STATES=2, PETRI_FLOW=36, PETRI_PLACES=16, PETRI_TRANSITIONS=18} [2021-10-15 20:27:28,629 INFO L334 CegarLoopForPetriNet]: 15 programPoint places, 1 predicate places. [2021-10-15 20:27:28,630 INFO L470 AbstractCegarLoop]: Abstraction has has 16 places, 18 transitions, 36 flow [2021-10-15 20:27:28,631 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 22.5) internal successors, (45), 2 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-15 20:27:28,631 INFO L246 CegarLoopForPetriNet]: Found error trace [2021-10-15 20:27:28,632 INFO L254 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-15 20:27:28,632 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-10-15 20:27:28,633 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-15 20:27:28,634 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-15 20:27:28,634 INFO L82 PathProgramCache]: Analyzing trace with hash -2016295915, now seen corresponding path program 1 times [2021-10-15 20:27:28,635 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-15 20:27:28,635 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [185008706] [2021-10-15 20:27:28,636 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-15 20:27:28,636 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-15 20:27:28,666 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-15 20:27:28,748 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-15 20:27:28,748 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-15 20:27:28,749 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [185008706] [2021-10-15 20:27:28,749 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [185008706] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-15 20:27:28,750 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-15 20:27:28,750 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-10-15 20:27:28,750 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [217694338] [2021-10-15 20:27:28,752 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-10-15 20:27:28,752 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-15 20:27:28,753 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-10-15 20:27:28,767 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-10-15 20:27:28,768 INFO L499 CegarLoopForPetriNet]: Number of universal loopers: 13 out of 26 [2021-10-15 20:27:28,769 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 16 places, 18 transitions, 36 flow. Second operand has 3 states, 3 states have (on average 14.333333333333334) internal successors, (43), 3 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-15 20:27:28,769 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-10-15 20:27:28,770 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 13 of 26 [2021-10-15 20:27:28,770 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-10-15 20:27:28,815 INFO L129 PetriNetUnfolder]: 4/20 cut-off events. [2021-10-15 20:27:28,816 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-10-15 20:27:28,816 INFO L84 FinitePrefix]: Finished finitePrefix Result has 34 conditions, 20 events. 4/20 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 2. Compared 13 event pairs, 0 based on Foata normal form. 0/17 useless extension candidates. Maximal degree in co-relation 31. Up to 10 conditions per place. [2021-10-15 20:27:28,817 INFO L132 encePairwiseOnDemand]: 23/26 looper letters, 9 selfloop transitions, 2 changer transitions 0/20 dead transitions. [2021-10-15 20:27:28,817 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 18 places, 20 transitions, 62 flow [2021-10-15 20:27:28,818 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-10-15 20:27:28,818 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2021-10-15 20:27:28,819 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 51 transitions. [2021-10-15 20:27:28,819 INFO L544 CegarLoopForPetriNet]: DFA transition density 0.6538461538461539 [2021-10-15 20:27:28,820 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 51 transitions. [2021-10-15 20:27:28,820 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 51 transitions. [2021-10-15 20:27:28,820 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-10-15 20:27:28,821 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 51 transitions. [2021-10-15 20:27:28,822 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 17.0) internal successors, (51), 3 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-15 20:27:28,823 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 26.0) internal successors, (104), 4 states have internal predecessors, (104), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-15 20:27:28,824 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 26.0) internal successors, (104), 4 states have internal predecessors, (104), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-15 20:27:28,824 INFO L186 Difference]: Start difference. First operand has 16 places, 18 transitions, 36 flow. Second operand 3 states and 51 transitions. [2021-10-15 20:27:28,824 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 18 places, 20 transitions, 62 flow [2021-10-15 20:27:28,825 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 18 places, 20 transitions, 62 flow, removed 0 selfloop flow, removed 0 redundant places. [2021-10-15 20:27:28,827 INFO L242 Difference]: Finished difference. Result has 19 places, 19 transitions, 48 flow [2021-10-15 20:27:28,828 INFO L317 CegarLoopForPetriNet]: {PETRI_ALPHABET=26, PETRI_DIFFERENCE_MINUEND_FLOW=36, PETRI_DIFFERENCE_MINUEND_PLACES=16, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=18, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=16, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=48, PETRI_PLACES=19, PETRI_TRANSITIONS=19} [2021-10-15 20:27:28,828 INFO L334 CegarLoopForPetriNet]: 15 programPoint places, 4 predicate places. [2021-10-15 20:27:28,829 INFO L470 AbstractCegarLoop]: Abstraction has has 19 places, 19 transitions, 48 flow [2021-10-15 20:27:28,829 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 14.333333333333334) internal successors, (43), 3 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-15 20:27:28,830 INFO L246 CegarLoopForPetriNet]: Found error trace [2021-10-15 20:27:28,830 INFO L254 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-15 20:27:28,830 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-10-15 20:27:28,831 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-15 20:27:28,831 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-15 20:27:28,832 INFO L82 PathProgramCache]: Analyzing trace with hash 1564799315, now seen corresponding path program 1 times [2021-10-15 20:27:28,832 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-15 20:27:28,832 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [921154530] [2021-10-15 20:27:28,833 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-15 20:27:28,833 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-15 20:27:28,851 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-15 20:27:28,901 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-15 20:27:28,901 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-15 20:27:28,902 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [921154530] [2021-10-15 20:27:28,902 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [921154530] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-15 20:27:28,902 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1625784385] [2021-10-15 20:27:28,903 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-15 20:27:28,903 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-15 20:27:28,904 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/z3 [2021-10-15 20:27:28,925 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-15 20:27:28,959 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-10-15 20:27:29,033 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-15 20:27:29,035 INFO L263 TraceCheckSpWp]: Trace formula consists of 59 conjuncts, 2 conjunts are in the unsatisfiable core [2021-10-15 20:27:29,042 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-15 20:27:29,113 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-15 20:27:29,114 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1625784385] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-15 20:27:29,114 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2021-10-15 20:27:29,115 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [4] total 4 [2021-10-15 20:27:29,115 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [255079228] [2021-10-15 20:27:29,116 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-10-15 20:27:29,116 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-15 20:27:29,119 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-10-15 20:27:29,120 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-10-15 20:27:29,124 INFO L499 CegarLoopForPetriNet]: Number of universal loopers: 13 out of 26 [2021-10-15 20:27:29,125 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 19 places, 19 transitions, 48 flow. Second operand has 3 states, 3 states have (on average 15.0) internal successors, (45), 3 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-15 20:27:29,126 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-10-15 20:27:29,126 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 13 of 26 [2021-10-15 20:27:29,126 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-10-15 20:27:29,178 INFO L129 PetriNetUnfolder]: 5/24 cut-off events. [2021-10-15 20:27:29,178 INFO L130 PetriNetUnfolder]: For 3/3 co-relation queries the response was YES. [2021-10-15 20:27:29,179 INFO L84 FinitePrefix]: Finished finitePrefix Result has 48 conditions, 24 events. 5/24 cut-off events. For 3/3 co-relation queries the response was YES. Maximal size of possible extension queue 2. Compared 13 event pairs, 0 based on Foata normal form. 0/22 useless extension candidates. Maximal degree in co-relation 43. Up to 10 conditions per place. [2021-10-15 20:27:29,180 INFO L132 encePairwiseOnDemand]: 21/26 looper letters, 10 selfloop transitions, 4 changer transitions 0/23 dead transitions. [2021-10-15 20:27:29,181 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 21 places, 23 transitions, 84 flow [2021-10-15 20:27:29,181 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-10-15 20:27:29,182 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2021-10-15 20:27:29,184 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 54 transitions. [2021-10-15 20:27:29,185 INFO L544 CegarLoopForPetriNet]: DFA transition density 0.6923076923076923 [2021-10-15 20:27:29,185 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 54 transitions. [2021-10-15 20:27:29,186 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 54 transitions. [2021-10-15 20:27:29,186 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-10-15 20:27:29,186 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 54 transitions. [2021-10-15 20:27:29,191 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 18.0) internal successors, (54), 3 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-15 20:27:29,194 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 26.0) internal successors, (104), 4 states have internal predecessors, (104), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-15 20:27:29,195 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 26.0) internal successors, (104), 4 states have internal predecessors, (104), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-15 20:27:29,196 INFO L186 Difference]: Start difference. First operand has 19 places, 19 transitions, 48 flow. Second operand 3 states and 54 transitions. [2021-10-15 20:27:29,196 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 21 places, 23 transitions, 84 flow [2021-10-15 20:27:29,199 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 20 places, 23 transitions, 82 flow, removed 0 selfloop flow, removed 1 redundant places. [2021-10-15 20:27:29,204 INFO L242 Difference]: Finished difference. Result has 21 places, 20 transitions, 64 flow [2021-10-15 20:27:29,204 INFO L317 CegarLoopForPetriNet]: {PETRI_ALPHABET=26, PETRI_DIFFERENCE_MINUEND_FLOW=46, PETRI_DIFFERENCE_MINUEND_PLACES=18, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=19, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=3, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=15, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=64, PETRI_PLACES=21, PETRI_TRANSITIONS=20} [2021-10-15 20:27:29,205 INFO L334 CegarLoopForPetriNet]: 15 programPoint places, 6 predicate places. [2021-10-15 20:27:29,205 INFO L470 AbstractCegarLoop]: Abstraction has has 21 places, 20 transitions, 64 flow [2021-10-15 20:27:29,205 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 15.0) internal successors, (45), 3 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-15 20:27:29,206 INFO L246 CegarLoopForPetriNet]: Found error trace [2021-10-15 20:27:29,206 INFO L254 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-15 20:27:29,249 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-10-15 20:27:29,428 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-15 20:27:29,428 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-15 20:27:29,429 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-15 20:27:29,429 INFO L82 PathProgramCache]: Analyzing trace with hash 1450869459, now seen corresponding path program 1 times [2021-10-15 20:27:29,429 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-15 20:27:29,429 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [76415423] [2021-10-15 20:27:29,430 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-15 20:27:29,430 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-15 20:27:29,468 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-15 20:27:29,541 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-15 20:27:29,541 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-15 20:27:29,542 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [76415423] [2021-10-15 20:27:29,542 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [76415423] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-15 20:27:29,543 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1233337316] [2021-10-15 20:27:29,543 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-15 20:27:29,543 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-15 20:27:29,544 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/z3 [2021-10-15 20:27:29,554 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-15 20:27:29,596 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-10-15 20:27:29,668 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-15 20:27:29,670 INFO L263 TraceCheckSpWp]: Trace formula consists of 65 conjuncts, 3 conjunts are in the unsatisfiable core [2021-10-15 20:27:29,671 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-15 20:27:29,758 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-15 20:27:29,759 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1233337316] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-15 20:27:29,759 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-10-15 20:27:29,759 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 5 [2021-10-15 20:27:29,760 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1597558453] [2021-10-15 20:27:29,760 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-10-15 20:27:29,761 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-15 20:27:29,761 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-10-15 20:27:29,762 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2021-10-15 20:27:29,765 INFO L499 CegarLoopForPetriNet]: Number of universal loopers: 13 out of 26 [2021-10-15 20:27:29,766 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 21 places, 20 transitions, 64 flow. Second operand has 5 states, 5 states have (on average 15.2) internal successors, (76), 5 states have internal predecessors, (76), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-15 20:27:29,766 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-10-15 20:27:29,766 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 13 of 26 [2021-10-15 20:27:29,766 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-10-15 20:27:29,816 INFO L129 PetriNetUnfolder]: 5/26 cut-off events. [2021-10-15 20:27:29,816 INFO L130 PetriNetUnfolder]: For 10/10 co-relation queries the response was YES. [2021-10-15 20:27:29,817 INFO L84 FinitePrefix]: Finished finitePrefix Result has 61 conditions, 26 events. 5/26 cut-off events. For 10/10 co-relation queries the response was YES. Maximal size of possible extension queue 2. Compared 13 event pairs, 0 based on Foata normal form. 1/26 useless extension candidates. Maximal degree in co-relation 55. Up to 10 conditions per place. [2021-10-15 20:27:29,818 INFO L132 encePairwiseOnDemand]: 21/26 looper letters, 11 selfloop transitions, 5 changer transitions 0/25 dead transitions. [2021-10-15 20:27:29,818 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 24 places, 25 transitions, 108 flow [2021-10-15 20:27:29,818 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-10-15 20:27:29,819 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4 states. [2021-10-15 20:27:29,820 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4 states to 4 states and 69 transitions. [2021-10-15 20:27:29,820 INFO L544 CegarLoopForPetriNet]: DFA transition density 0.6634615384615384 [2021-10-15 20:27:29,820 INFO L72 ComplementDD]: Start complementDD. Operand 4 states and 69 transitions. [2021-10-15 20:27:29,821 INFO L73 IsDeterministic]: Start isDeterministic. Operand 4 states and 69 transitions. [2021-10-15 20:27:29,821 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-10-15 20:27:29,821 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 4 states and 69 transitions. [2021-10-15 20:27:29,822 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 5 states, 4 states have (on average 17.25) internal successors, (69), 4 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-15 20:27:29,823 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 5 states, 5 states have (on average 26.0) internal successors, (130), 5 states have internal predecessors, (130), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-15 20:27:29,824 INFO L81 ComplementDD]: Finished complementDD. Result has 5 states, 5 states have (on average 26.0) internal successors, (130), 5 states have internal predecessors, (130), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-15 20:27:29,824 INFO L186 Difference]: Start difference. First operand has 21 places, 20 transitions, 64 flow. Second operand 4 states and 69 transitions. [2021-10-15 20:27:29,824 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 24 places, 25 transitions, 108 flow [2021-10-15 20:27:29,825 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 23 places, 25 transitions, 104 flow, removed 0 selfloop flow, removed 1 redundant places. [2021-10-15 20:27:29,827 INFO L242 Difference]: Finished difference. Result has 24 places, 21 transitions, 82 flow [2021-10-15 20:27:29,827 INFO L317 CegarLoopForPetriNet]: {PETRI_ALPHABET=26, PETRI_DIFFERENCE_MINUEND_FLOW=60, PETRI_DIFFERENCE_MINUEND_PLACES=20, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=20, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=4, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=15, PETRI_DIFFERENCE_SUBTRAHEND_STATES=4, PETRI_FLOW=82, PETRI_PLACES=24, PETRI_TRANSITIONS=21} [2021-10-15 20:27:29,827 INFO L334 CegarLoopForPetriNet]: 15 programPoint places, 9 predicate places. [2021-10-15 20:27:29,828 INFO L470 AbstractCegarLoop]: Abstraction has has 24 places, 21 transitions, 82 flow [2021-10-15 20:27:29,828 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 15.2) internal successors, (76), 5 states have internal predecessors, (76), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-15 20:27:29,828 INFO L246 CegarLoopForPetriNet]: Found error trace [2021-10-15 20:27:29,829 INFO L254 CegarLoopForPetriNet]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-15 20:27:29,872 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-10-15 20:27:30,054 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-15 20:27:30,054 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-15 20:27:30,055 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-15 20:27:30,055 INFO L82 PathProgramCache]: Analyzing trace with hash 617081941, now seen corresponding path program 2 times [2021-10-15 20:27:30,055 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-15 20:27:30,056 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1345815702] [2021-10-15 20:27:30,056 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-15 20:27:30,056 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-15 20:27:30,077 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-15 20:27:30,110 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-10-15 20:27:30,111 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-15 20:27:30,111 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1345815702] [2021-10-15 20:27:30,111 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1345815702] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-15 20:27:30,112 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1447959973] [2021-10-15 20:27:30,112 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-10-15 20:27:30,112 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-15 20:27:30,112 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/z3 [2021-10-15 20:27:30,114 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-15 20:27:30,136 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-10-15 20:27:30,192 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 1 check-sat command(s) [2021-10-15 20:27:30,192 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-15 20:27:30,193 INFO L263 TraceCheckSpWp]: Trace formula consists of 53 conjuncts, 9 conjunts are in the unsatisfiable core [2021-10-15 20:27:30,195 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-15 20:27:30,465 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 33 treesize of output 25 [2021-10-15 20:27:30,519 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-10-15 20:27:30,519 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1447959973] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-15 20:27:30,521 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2021-10-15 20:27:30,521 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [4] total 8 [2021-10-15 20:27:30,521 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [494590804] [2021-10-15 20:27:30,523 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-10-15 20:27:30,523 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-15 20:27:30,525 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-10-15 20:27:30,525 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2021-10-15 20:27:30,526 INFO L499 CegarLoopForPetriNet]: Number of universal loopers: 8 out of 26 [2021-10-15 20:27:30,528 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 24 places, 21 transitions, 82 flow. Second operand has 6 states, 6 states have (on average 9.5) internal successors, (57), 6 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-15 20:27:30,529 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-10-15 20:27:30,529 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 8 of 26 [2021-10-15 20:27:30,529 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-10-15 20:27:30,637 INFO L129 PetriNetUnfolder]: 7/44 cut-off events. [2021-10-15 20:27:30,637 INFO L130 PetriNetUnfolder]: For 16/16 co-relation queries the response was YES. [2021-10-15 20:27:30,638 INFO L84 FinitePrefix]: Finished finitePrefix Result has 105 conditions, 44 events. 7/44 cut-off events. For 16/16 co-relation queries the response was YES. Maximal size of possible extension queue 5. Compared 51 event pairs, 0 based on Foata normal form. 0/39 useless extension candidates. Maximal degree in co-relation 98. Up to 14 conditions per place. [2021-10-15 20:27:30,639 INFO L132 encePairwiseOnDemand]: 19/26 looper letters, 17 selfloop transitions, 7 changer transitions 0/33 dead transitions. [2021-10-15 20:27:30,639 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 30 places, 33 transitions, 154 flow [2021-10-15 20:27:30,639 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-10-15 20:27:30,640 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7 states. [2021-10-15 20:27:30,641 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7 states to 7 states and 81 transitions. [2021-10-15 20:27:30,641 INFO L544 CegarLoopForPetriNet]: DFA transition density 0.44505494505494503 [2021-10-15 20:27:30,641 INFO L72 ComplementDD]: Start complementDD. Operand 7 states and 81 transitions. [2021-10-15 20:27:30,642 INFO L73 IsDeterministic]: Start isDeterministic. Operand 7 states and 81 transitions. [2021-10-15 20:27:30,642 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-10-15 20:27:30,642 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 7 states and 81 transitions. [2021-10-15 20:27:30,643 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 8 states, 7 states have (on average 11.571428571428571) internal successors, (81), 7 states have internal predecessors, (81), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-15 20:27:30,644 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 8 states, 8 states have (on average 26.0) internal successors, (208), 8 states have internal predecessors, (208), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-15 20:27:30,645 INFO L81 ComplementDD]: Finished complementDD. Result has 8 states, 8 states have (on average 26.0) internal successors, (208), 8 states have internal predecessors, (208), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-15 20:27:30,645 INFO L186 Difference]: Start difference. First operand has 24 places, 21 transitions, 82 flow. Second operand 7 states and 81 transitions. [2021-10-15 20:27:30,645 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 30 places, 33 transitions, 154 flow [2021-10-15 20:27:30,647 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 28 places, 33 transitions, 146 flow, removed 1 selfloop flow, removed 2 redundant places. [2021-10-15 20:27:30,648 INFO L242 Difference]: Finished difference. Result has 32 places, 26 transitions, 120 flow [2021-10-15 20:27:30,649 INFO L317 CegarLoopForPetriNet]: {PETRI_ALPHABET=26, PETRI_DIFFERENCE_MINUEND_FLOW=74, PETRI_DIFFERENCE_MINUEND_PLACES=22, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=21, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=2, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=15, PETRI_DIFFERENCE_SUBTRAHEND_STATES=7, PETRI_FLOW=120, PETRI_PLACES=32, PETRI_TRANSITIONS=26} [2021-10-15 20:27:30,649 INFO L334 CegarLoopForPetriNet]: 15 programPoint places, 17 predicate places. [2021-10-15 20:27:30,649 INFO L470 AbstractCegarLoop]: Abstraction has has 32 places, 26 transitions, 120 flow [2021-10-15 20:27:30,650 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 9.5) internal successors, (57), 6 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-15 20:27:30,650 INFO L246 CegarLoopForPetriNet]: Found error trace [2021-10-15 20:27:30,650 INFO L254 CegarLoopForPetriNet]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-15 20:27:30,692 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-10-15 20:27:30,868 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-15 20:27:30,868 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-15 20:27:30,868 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-15 20:27:30,869 INFO L82 PathProgramCache]: Analyzing trace with hash -1157925421, now seen corresponding path program 1 times [2021-10-15 20:27:30,869 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-15 20:27:30,869 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [811595235] [2021-10-15 20:27:30,869 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-15 20:27:30,869 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-15 20:27:30,891 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-15 20:27:30,942 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-10-15 20:27:30,942 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-15 20:27:30,943 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [811595235] [2021-10-15 20:27:30,943 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [811595235] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-15 20:27:30,943 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [12542297] [2021-10-15 20:27:30,944 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-15 20:27:30,944 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-15 20:27:30,944 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/z3 [2021-10-15 20:27:30,945 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-15 20:27:30,953 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-10-15 20:27:31,035 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-15 20:27:31,036 INFO L263 TraceCheckSpWp]: Trace formula consists of 73 conjuncts, 4 conjunts are in the unsatisfiable core [2021-10-15 20:27:31,037 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-15 20:27:31,104 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-15 20:27:31,104 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [12542297] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-15 20:27:31,104 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-10-15 20:27:31,104 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 5] total 6 [2021-10-15 20:27:31,105 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1703624018] [2021-10-15 20:27:31,105 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-10-15 20:27:31,106 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-15 20:27:31,106 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-10-15 20:27:31,107 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=16, Unknown=0, NotChecked=0, Total=30 [2021-10-15 20:27:31,107 INFO L499 CegarLoopForPetriNet]: Number of universal loopers: 13 out of 26 [2021-10-15 20:27:31,108 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 32 places, 26 transitions, 120 flow. Second operand has 6 states, 6 states have (on average 16.333333333333332) internal successors, (98), 6 states have internal predecessors, (98), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-15 20:27:31,108 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-10-15 20:27:31,108 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 13 of 26 [2021-10-15 20:27:31,108 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-10-15 20:27:31,179 INFO L129 PetriNetUnfolder]: 9/54 cut-off events. [2021-10-15 20:27:31,179 INFO L130 PetriNetUnfolder]: For 26/26 co-relation queries the response was YES. [2021-10-15 20:27:31,180 INFO L84 FinitePrefix]: Finished finitePrefix Result has 145 conditions, 54 events. 9/54 cut-off events. For 26/26 co-relation queries the response was YES. Maximal size of possible extension queue 5. Compared 65 event pairs, 0 based on Foata normal form. 3/57 useless extension candidates. Maximal degree in co-relation 134. Up to 15 conditions per place. [2021-10-15 20:27:31,181 INFO L132 encePairwiseOnDemand]: 20/26 looper letters, 16 selfloop transitions, 7 changer transitions 0/36 dead transitions. [2021-10-15 20:27:31,182 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 37 places, 36 transitions, 200 flow [2021-10-15 20:27:31,182 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-10-15 20:27:31,182 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6 states. [2021-10-15 20:27:31,183 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6 states to 6 states and 101 transitions. [2021-10-15 20:27:31,184 INFO L544 CegarLoopForPetriNet]: DFA transition density 0.6474358974358975 [2021-10-15 20:27:31,184 INFO L72 ComplementDD]: Start complementDD. Operand 6 states and 101 transitions. [2021-10-15 20:27:31,184 INFO L73 IsDeterministic]: Start isDeterministic. Operand 6 states and 101 transitions. [2021-10-15 20:27:31,185 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-10-15 20:27:31,185 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 6 states and 101 transitions. [2021-10-15 20:27:31,186 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 7 states, 6 states have (on average 16.833333333333332) internal successors, (101), 6 states have internal predecessors, (101), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-15 20:27:31,187 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 7 states, 7 states have (on average 26.0) internal successors, (182), 7 states have internal predecessors, (182), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-15 20:27:31,187 INFO L81 ComplementDD]: Finished complementDD. Result has 7 states, 7 states have (on average 26.0) internal successors, (182), 7 states have internal predecessors, (182), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-15 20:27:31,188 INFO L186 Difference]: Start difference. First operand has 32 places, 26 transitions, 120 flow. Second operand 6 states and 101 transitions. [2021-10-15 20:27:31,188 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 37 places, 36 transitions, 200 flow [2021-10-15 20:27:31,191 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 35 places, 36 transitions, 194 flow, removed 0 selfloop flow, removed 2 redundant places. [2021-10-15 20:27:31,192 INFO L242 Difference]: Finished difference. Result has 36 places, 28 transitions, 152 flow [2021-10-15 20:27:31,192 INFO L317 CegarLoopForPetriNet]: {PETRI_ALPHABET=26, PETRI_DIFFERENCE_MINUEND_FLOW=116, PETRI_DIFFERENCE_MINUEND_PLACES=30, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=26, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=5, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=19, PETRI_DIFFERENCE_SUBTRAHEND_STATES=6, PETRI_FLOW=152, PETRI_PLACES=36, PETRI_TRANSITIONS=28} [2021-10-15 20:27:31,193 INFO L334 CegarLoopForPetriNet]: 15 programPoint places, 21 predicate places. [2021-10-15 20:27:31,193 INFO L470 AbstractCegarLoop]: Abstraction has has 36 places, 28 transitions, 152 flow [2021-10-15 20:27:31,193 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 16.333333333333332) internal successors, (98), 6 states have internal predecessors, (98), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-15 20:27:31,193 INFO L246 CegarLoopForPetriNet]: Found error trace [2021-10-15 20:27:31,194 INFO L254 CegarLoopForPetriNet]: trace histogram [3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-15 20:27:31,245 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-10-15 20:27:31,428 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-15 20:27:31,428 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-15 20:27:31,428 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-15 20:27:31,429 INFO L82 PathProgramCache]: Analyzing trace with hash -171842031, now seen corresponding path program 1 times [2021-10-15 20:27:31,429 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-15 20:27:31,429 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [834411814] [2021-10-15 20:27:31,429 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-15 20:27:31,429 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-15 20:27:31,451 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-15 20:27:31,492 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-10-15 20:27:31,493 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-15 20:27:31,493 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [834411814] [2021-10-15 20:27:31,493 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [834411814] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-15 20:27:31,493 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [271201822] [2021-10-15 20:27:31,494 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-15 20:27:31,494 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-15 20:27:31,494 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/z3 [2021-10-15 20:27:31,495 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-15 20:27:31,524 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-10-15 20:27:31,605 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-15 20:27:31,606 INFO L263 TraceCheckSpWp]: Trace formula consists of 85 conjuncts, 5 conjunts are in the unsatisfiable core [2021-10-15 20:27:31,611 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-15 20:27:31,704 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-10-15 20:27:31,704 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [271201822] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-15 20:27:31,705 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-10-15 20:27:31,705 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 6] total 7 [2021-10-15 20:27:31,705 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1342207818] [2021-10-15 20:27:31,706 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-10-15 20:27:31,706 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-15 20:27:31,706 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-10-15 20:27:31,707 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=22, Unknown=0, NotChecked=0, Total=42 [2021-10-15 20:27:31,708 INFO L499 CegarLoopForPetriNet]: Number of universal loopers: 13 out of 26 [2021-10-15 20:27:31,708 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 36 places, 28 transitions, 152 flow. Second operand has 7 states, 7 states have (on average 16.428571428571427) internal successors, (115), 7 states have internal predecessors, (115), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-15 20:27:31,708 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-10-15 20:27:31,708 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 13 of 26 [2021-10-15 20:27:31,709 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-10-15 20:27:31,787 INFO L129 PetriNetUnfolder]: 11/64 cut-off events. [2021-10-15 20:27:31,787 INFO L130 PetriNetUnfolder]: For 65/65 co-relation queries the response was YES. [2021-10-15 20:27:31,788 INFO L84 FinitePrefix]: Finished finitePrefix Result has 187 conditions, 64 events. 11/64 cut-off events. For 65/65 co-relation queries the response was YES. Maximal size of possible extension queue 5. Compared 75 event pairs, 0 based on Foata normal form. 3/67 useless extension candidates. Maximal degree in co-relation 175. Up to 15 conditions per place. [2021-10-15 20:27:31,788 INFO L132 encePairwiseOnDemand]: 20/26 looper letters, 20 selfloop transitions, 9 changer transitions 0/42 dead transitions. [2021-10-15 20:27:31,789 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 42 places, 42 transitions, 258 flow [2021-10-15 20:27:31,789 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-10-15 20:27:31,789 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7 states. [2021-10-15 20:27:31,790 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7 states to 7 states and 119 transitions. [2021-10-15 20:27:31,790 INFO L544 CegarLoopForPetriNet]: DFA transition density 0.6538461538461539 [2021-10-15 20:27:31,791 INFO L72 ComplementDD]: Start complementDD. Operand 7 states and 119 transitions. [2021-10-15 20:27:31,791 INFO L73 IsDeterministic]: Start isDeterministic. Operand 7 states and 119 transitions. [2021-10-15 20:27:31,791 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-10-15 20:27:31,791 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 7 states and 119 transitions. [2021-10-15 20:27:31,792 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 8 states, 7 states have (on average 17.0) internal successors, (119), 7 states have internal predecessors, (119), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-15 20:27:31,793 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 8 states, 8 states have (on average 26.0) internal successors, (208), 8 states have internal predecessors, (208), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-15 20:27:31,794 INFO L81 ComplementDD]: Finished complementDD. Result has 8 states, 8 states have (on average 26.0) internal successors, (208), 8 states have internal predecessors, (208), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-15 20:27:31,794 INFO L186 Difference]: Start difference. First operand has 36 places, 28 transitions, 152 flow. Second operand 7 states and 119 transitions. [2021-10-15 20:27:31,794 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 42 places, 42 transitions, 258 flow [2021-10-15 20:27:31,797 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 38 places, 42 transitions, 238 flow, removed 3 selfloop flow, removed 4 redundant places. [2021-10-15 20:27:31,799 INFO L242 Difference]: Finished difference. Result has 39 places, 30 transitions, 176 flow [2021-10-15 20:27:31,799 INFO L317 CegarLoopForPetriNet]: {PETRI_ALPHABET=26, PETRI_DIFFERENCE_MINUEND_FLOW=132, PETRI_DIFFERENCE_MINUEND_PLACES=32, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=28, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=7, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=19, PETRI_DIFFERENCE_SUBTRAHEND_STATES=7, PETRI_FLOW=176, PETRI_PLACES=39, PETRI_TRANSITIONS=30} [2021-10-15 20:27:31,799 INFO L334 CegarLoopForPetriNet]: 15 programPoint places, 24 predicate places. [2021-10-15 20:27:31,800 INFO L470 AbstractCegarLoop]: Abstraction has has 39 places, 30 transitions, 176 flow [2021-10-15 20:27:31,800 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 16.428571428571427) internal successors, (115), 7 states have internal predecessors, (115), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-15 20:27:31,800 INFO L246 CegarLoopForPetriNet]: Found error trace [2021-10-15 20:27:31,800 INFO L254 CegarLoopForPetriNet]: trace histogram [4, 4, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-15 20:27:31,826 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-10-15 20:27:32,020 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2021-10-15 20:27:32,020 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-15 20:27:32,021 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-15 20:27:32,021 INFO L82 PathProgramCache]: Analyzing trace with hash 121658455, now seen corresponding path program 2 times [2021-10-15 20:27:32,021 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-15 20:27:32,021 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [512422154] [2021-10-15 20:27:32,021 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-15 20:27:32,022 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-15 20:27:32,072 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-15 20:27:32,134 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-10-15 20:27:32,135 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-15 20:27:32,135 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [512422154] [2021-10-15 20:27:32,135 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [512422154] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-15 20:27:32,136 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2090026750] [2021-10-15 20:27:32,136 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-10-15 20:27:32,136 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-15 20:27:32,136 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/z3 [2021-10-15 20:27:32,137 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-15 20:27:32,160 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-10-15 20:27:32,238 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-10-15 20:27:32,238 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-15 20:27:32,239 INFO L263 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 6 conjunts are in the unsatisfiable core [2021-10-15 20:27:32,241 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-15 20:27:32,348 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-10-15 20:27:32,351 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2090026750] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-15 20:27:32,351 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-10-15 20:27:32,352 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 8 [2021-10-15 20:27:32,352 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [24496368] [2021-10-15 20:27:32,353 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-10-15 20:27:32,353 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-15 20:27:32,354 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-10-15 20:27:32,355 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=28, Unknown=0, NotChecked=0, Total=56 [2021-10-15 20:27:32,355 INFO L499 CegarLoopForPetriNet]: Number of universal loopers: 13 out of 26 [2021-10-15 20:27:32,356 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 39 places, 30 transitions, 176 flow. Second operand has 8 states, 8 states have (on average 15.25) internal successors, (122), 8 states have internal predecessors, (122), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-15 20:27:32,356 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-10-15 20:27:32,356 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 13 of 26 [2021-10-15 20:27:32,356 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-10-15 20:27:32,455 INFO L129 PetriNetUnfolder]: 13/74 cut-off events. [2021-10-15 20:27:32,455 INFO L130 PetriNetUnfolder]: For 97/97 co-relation queries the response was YES. [2021-10-15 20:27:32,456 INFO L84 FinitePrefix]: Finished finitePrefix Result has 227 conditions, 74 events. 13/74 cut-off events. For 97/97 co-relation queries the response was YES. Maximal size of possible extension queue 5. Compared 82 event pairs, 0 based on Foata normal form. 3/77 useless extension candidates. Maximal degree in co-relation 214. Up to 18 conditions per place. [2021-10-15 20:27:32,458 INFO L132 encePairwiseOnDemand]: 20/26 looper letters, 24 selfloop transitions, 11 changer transitions 0/48 dead transitions. [2021-10-15 20:27:32,458 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 45 places, 48 transitions, 310 flow [2021-10-15 20:27:32,459 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-10-15 20:27:32,459 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7 states. [2021-10-15 20:27:32,462 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7 states to 7 states and 124 transitions. [2021-10-15 20:27:32,462 INFO L544 CegarLoopForPetriNet]: DFA transition density 0.6813186813186813 [2021-10-15 20:27:32,462 INFO L72 ComplementDD]: Start complementDD. Operand 7 states and 124 transitions. [2021-10-15 20:27:32,462 INFO L73 IsDeterministic]: Start isDeterministic. Operand 7 states and 124 transitions. [2021-10-15 20:27:32,463 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-10-15 20:27:32,463 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 7 states and 124 transitions. [2021-10-15 20:27:32,468 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 8 states, 7 states have (on average 17.714285714285715) internal successors, (124), 7 states have internal predecessors, (124), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-15 20:27:32,471 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 8 states, 8 states have (on average 26.0) internal successors, (208), 8 states have internal predecessors, (208), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-15 20:27:32,472 INFO L81 ComplementDD]: Finished complementDD. Result has 8 states, 8 states have (on average 26.0) internal successors, (208), 8 states have internal predecessors, (208), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-15 20:27:32,473 INFO L186 Difference]: Start difference. First operand has 39 places, 30 transitions, 176 flow. Second operand 7 states and 124 transitions. [2021-10-15 20:27:32,473 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 45 places, 48 transitions, 310 flow [2021-10-15 20:27:32,483 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 40 places, 48 transitions, 286 flow, removed 5 selfloop flow, removed 5 redundant places. [2021-10-15 20:27:32,485 INFO L242 Difference]: Finished difference. Result has 41 places, 32 transitions, 204 flow [2021-10-15 20:27:32,485 INFO L317 CegarLoopForPetriNet]: {PETRI_ALPHABET=26, PETRI_DIFFERENCE_MINUEND_FLOW=152, PETRI_DIFFERENCE_MINUEND_PLACES=34, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=30, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=9, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=19, PETRI_DIFFERENCE_SUBTRAHEND_STATES=7, PETRI_FLOW=204, PETRI_PLACES=41, PETRI_TRANSITIONS=32} [2021-10-15 20:27:32,485 INFO L334 CegarLoopForPetriNet]: 15 programPoint places, 26 predicate places. [2021-10-15 20:27:32,488 INFO L470 AbstractCegarLoop]: Abstraction has has 41 places, 32 transitions, 204 flow [2021-10-15 20:27:32,488 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 15.25) internal successors, (122), 8 states have internal predecessors, (122), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-15 20:27:32,488 INFO L246 CegarLoopForPetriNet]: Found error trace [2021-10-15 20:27:32,489 INFO L254 CegarLoopForPetriNet]: trace histogram [5, 5, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-15 20:27:32,534 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-10-15 20:27:32,716 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-15 20:27:32,716 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-15 20:27:32,716 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-15 20:27:32,717 INFO L82 PathProgramCache]: Analyzing trace with hash -445961331, now seen corresponding path program 3 times [2021-10-15 20:27:32,717 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-15 20:27:32,717 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [110141785] [2021-10-15 20:27:32,717 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-15 20:27:32,717 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-15 20:27:32,757 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-15 20:27:32,857 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-10-15 20:27:32,857 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-15 20:27:32,857 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [110141785] [2021-10-15 20:27:32,857 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [110141785] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-15 20:27:32,858 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1261752214] [2021-10-15 20:27:32,858 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-10-15 20:27:32,858 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-15 20:27:32,858 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/z3 [2021-10-15 20:27:32,864 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-15 20:27:32,883 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-10-15 20:27:32,965 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-10-15 20:27:32,965 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-15 20:27:32,966 INFO L263 TraceCheckSpWp]: Trace formula consists of 79 conjuncts, 12 conjunts are in the unsatisfiable core [2021-10-15 20:27:32,971 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-15 20:27:33,556 INFO L354 Elim1Store]: treesize reduction 4, result has 60.0 percent of original size [2021-10-15 20:27:33,557 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 48 treesize of output 34 [2021-10-15 20:27:33,599 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 4 proven. 3 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-10-15 20:27:33,599 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1261752214] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-15 20:27:33,600 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-10-15 20:27:33,600 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 14 [2021-10-15 20:27:33,603 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [445273223] [2021-10-15 20:27:33,605 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-10-15 20:27:33,605 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-15 20:27:33,605 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-10-15 20:27:33,607 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=134, Unknown=0, NotChecked=0, Total=182 [2021-10-15 20:27:33,607 INFO L499 CegarLoopForPetriNet]: Number of universal loopers: 4 out of 26 [2021-10-15 20:27:33,607 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 41 places, 32 transitions, 204 flow. Second operand has 14 states, 14 states have (on average 6.571428571428571) internal successors, (92), 14 states have internal predecessors, (92), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-15 20:27:33,608 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-10-15 20:27:33,608 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 4 of 26 [2021-10-15 20:27:33,608 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-10-15 20:27:34,447 INFO L129 PetriNetUnfolder]: 15/89 cut-off events. [2021-10-15 20:27:34,447 INFO L130 PetriNetUnfolder]: For 113/113 co-relation queries the response was YES. [2021-10-15 20:27:34,448 INFO L84 FinitePrefix]: Finished finitePrefix Result has 309 conditions, 89 events. 15/89 cut-off events. For 113/113 co-relation queries the response was YES. Maximal size of possible extension queue 5. Compared 103 event pairs, 0 based on Foata normal form. 4/93 useless extension candidates. Maximal degree in co-relation 295. Up to 22 conditions per place. [2021-10-15 20:27:34,450 INFO L132 encePairwiseOnDemand]: 13/26 looper letters, 27 selfloop transitions, 55 changer transitions 0/84 dead transitions. [2021-10-15 20:27:34,450 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 75 places, 84 transitions, 577 flow [2021-10-15 20:27:34,450 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-10-15 20:27:34,451 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2021-10-15 20:27:34,453 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 223 transitions. [2021-10-15 20:27:34,453 INFO L544 CegarLoopForPetriNet]: DFA transition density 0.24505494505494504 [2021-10-15 20:27:34,454 INFO L72 ComplementDD]: Start complementDD. Operand 35 states and 223 transitions. [2021-10-15 20:27:34,454 INFO L73 IsDeterministic]: Start isDeterministic. Operand 35 states and 223 transitions. [2021-10-15 20:27:34,454 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-10-15 20:27:34,455 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 35 states and 223 transitions. [2021-10-15 20:27:34,456 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 36 states, 35 states have (on average 6.371428571428571) internal successors, (223), 35 states have internal predecessors, (223), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-15 20:27:34,460 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 36 states, 36 states have (on average 26.0) internal successors, (936), 36 states have internal predecessors, (936), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-15 20:27:34,460 INFO L81 ComplementDD]: Finished complementDD. Result has 36 states, 36 states have (on average 26.0) internal successors, (936), 36 states have internal predecessors, (936), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-15 20:27:34,461 INFO L186 Difference]: Start difference. First operand has 41 places, 32 transitions, 204 flow. Second operand 35 states and 223 transitions. [2021-10-15 20:27:34,461 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 75 places, 84 transitions, 577 flow [2021-10-15 20:27:34,464 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 70 places, 84 transitions, 533 flow, removed 10 selfloop flow, removed 5 redundant places. [2021-10-15 20:27:34,467 INFO L242 Difference]: Finished difference. Result has 76 places, 71 transitions, 467 flow [2021-10-15 20:27:34,468 INFO L317 CegarLoopForPetriNet]: {PETRI_ALPHABET=26, PETRI_DIFFERENCE_MINUEND_FLOW=172, PETRI_DIFFERENCE_MINUEND_PLACES=36, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=32, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=16, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=12, PETRI_DIFFERENCE_SUBTRAHEND_STATES=35, PETRI_FLOW=467, PETRI_PLACES=76, PETRI_TRANSITIONS=71} [2021-10-15 20:27:34,468 INFO L334 CegarLoopForPetriNet]: 15 programPoint places, 61 predicate places. [2021-10-15 20:27:34,468 INFO L470 AbstractCegarLoop]: Abstraction has has 76 places, 71 transitions, 467 flow [2021-10-15 20:27:34,469 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 6.571428571428571) internal successors, (92), 14 states have internal predecessors, (92), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-15 20:27:34,469 INFO L246 CegarLoopForPetriNet]: Found error trace [2021-10-15 20:27:34,469 INFO L254 CegarLoopForPetriNet]: trace histogram [6, 6, 5, 5, 5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-15 20:27:34,515 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-10-15 20:27:34,696 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-15 20:27:34,696 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-15 20:27:34,697 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-15 20:27:34,697 INFO L82 PathProgramCache]: Analyzing trace with hash -268132333, now seen corresponding path program 1 times [2021-10-15 20:27:34,697 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-15 20:27:34,697 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [767585398] [2021-10-15 20:27:34,697 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-15 20:27:34,697 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-15 20:27:34,722 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-15 20:27:34,798 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 37 trivial. 0 not checked. [2021-10-15 20:27:34,798 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-15 20:27:34,798 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [767585398] [2021-10-15 20:27:34,798 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [767585398] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-15 20:27:34,799 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1897293506] [2021-10-15 20:27:34,799 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-15 20:27:34,799 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-15 20:27:34,799 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/z3 [2021-10-15 20:27:34,800 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-15 20:27:34,816 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-10-15 20:27:34,913 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-15 20:27:34,915 INFO L263 TraceCheckSpWp]: Trace formula consists of 130 conjuncts, 8 conjunts are in the unsatisfiable core [2021-10-15 20:27:34,917 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-15 20:27:35,052 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 37 trivial. 0 not checked. [2021-10-15 20:27:35,052 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1897293506] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-15 20:27:35,052 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-10-15 20:27:35,052 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 10 [2021-10-15 20:27:35,053 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1828285588] [2021-10-15 20:27:35,053 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-10-15 20:27:35,053 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-15 20:27:35,054 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-10-15 20:27:35,054 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=45, Unknown=0, NotChecked=0, Total=90 [2021-10-15 20:27:35,055 INFO L499 CegarLoopForPetriNet]: Number of universal loopers: 13 out of 26 [2021-10-15 20:27:35,055 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 76 places, 71 transitions, 467 flow. Second operand has 10 states, 10 states have (on average 15.1) internal successors, (151), 10 states have internal predecessors, (151), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-15 20:27:35,055 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-10-15 20:27:35,055 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 13 of 26 [2021-10-15 20:27:35,055 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-10-15 20:27:35,158 INFO L129 PetriNetUnfolder]: 17/99 cut-off events. [2021-10-15 20:27:35,159 INFO L130 PetriNetUnfolder]: For 216/216 co-relation queries the response was YES. [2021-10-15 20:27:35,160 INFO L84 FinitePrefix]: Finished finitePrefix Result has 388 conditions, 99 events. 17/99 cut-off events. For 216/216 co-relation queries the response was YES. Maximal size of possible extension queue 4. Compared 109 event pairs, 0 based on Foata normal form. 3/102 useless extension candidates. Maximal degree in co-relation 368. Up to 26 conditions per place. [2021-10-15 20:27:35,161 INFO L132 encePairwiseOnDemand]: 20/26 looper letters, 38 selfloop transitions, 20 changer transitions 0/84 dead transitions. [2021-10-15 20:27:35,161 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 84 places, 84 transitions, 645 flow [2021-10-15 20:27:35,161 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-10-15 20:27:35,162 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 9 states. [2021-10-15 20:27:35,162 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9 states to 9 states and 160 transitions. [2021-10-15 20:27:35,163 INFO L544 CegarLoopForPetriNet]: DFA transition density 0.6837606837606838 [2021-10-15 20:27:35,163 INFO L72 ComplementDD]: Start complementDD. Operand 9 states and 160 transitions. [2021-10-15 20:27:35,163 INFO L73 IsDeterministic]: Start isDeterministic. Operand 9 states and 160 transitions. [2021-10-15 20:27:35,163 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-10-15 20:27:35,163 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 9 states and 160 transitions. [2021-10-15 20:27:35,164 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 10 states, 9 states have (on average 17.77777777777778) internal successors, (160), 9 states have internal predecessors, (160), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-15 20:27:35,165 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 10 states, 10 states have (on average 26.0) internal successors, (260), 10 states have internal predecessors, (260), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-15 20:27:35,166 INFO L81 ComplementDD]: Finished complementDD. Result has 10 states, 10 states have (on average 26.0) internal successors, (260), 10 states have internal predecessors, (260), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-15 20:27:35,166 INFO L186 Difference]: Start difference. First operand has 76 places, 71 transitions, 467 flow. Second operand 9 states and 160 transitions. [2021-10-15 20:27:35,166 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 84 places, 84 transitions, 645 flow [2021-10-15 20:27:35,172 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 74 places, 84 transitions, 520 flow, removed 25 selfloop flow, removed 10 redundant places. [2021-10-15 20:27:35,174 INFO L242 Difference]: Finished difference. Result has 75 places, 73 transitions, 430 flow [2021-10-15 20:27:35,175 INFO L317 CegarLoopForPetriNet]: {PETRI_ALPHABET=26, PETRI_DIFFERENCE_MINUEND_FLOW=349, PETRI_DIFFERENCE_MINUEND_PLACES=66, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=71, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=18, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=51, PETRI_DIFFERENCE_SUBTRAHEND_STATES=9, PETRI_FLOW=430, PETRI_PLACES=75, PETRI_TRANSITIONS=73} [2021-10-15 20:27:35,175 INFO L334 CegarLoopForPetriNet]: 15 programPoint places, 60 predicate places. [2021-10-15 20:27:35,175 INFO L470 AbstractCegarLoop]: Abstraction has has 75 places, 73 transitions, 430 flow [2021-10-15 20:27:35,175 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 15.1) internal successors, (151), 10 states have internal predecessors, (151), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-15 20:27:35,176 INFO L246 CegarLoopForPetriNet]: Found error trace [2021-10-15 20:27:35,176 INFO L254 CegarLoopForPetriNet]: trace histogram [7, 7, 6, 6, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-15 20:27:35,212 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-10-15 20:27:35,396 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-15 20:27:35,396 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-15 20:27:35,396 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-15 20:27:35,397 INFO L82 PathProgramCache]: Analyzing trace with hash 1443264639, now seen corresponding path program 1 times [2021-10-15 20:27:35,397 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-15 20:27:35,397 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [651801728] [2021-10-15 20:27:35,397 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-15 20:27:35,397 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-15 20:27:35,421 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-15 20:27:35,502 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 53 trivial. 0 not checked. [2021-10-15 20:27:35,502 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-15 20:27:35,503 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [651801728] [2021-10-15 20:27:35,503 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [651801728] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-15 20:27:35,503 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [493555024] [2021-10-15 20:27:35,503 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-15 20:27:35,503 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-15 20:27:35,503 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/z3 [2021-10-15 20:27:35,508 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-15 20:27:35,515 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-10-15 20:27:35,623 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-15 20:27:35,624 INFO L263 TraceCheckSpWp]: Trace formula consists of 148 conjuncts, 9 conjunts are in the unsatisfiable core [2021-10-15 20:27:35,627 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-15 20:27:35,733 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 53 trivial. 0 not checked. [2021-10-15 20:27:35,733 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [493555024] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-15 20:27:35,733 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-10-15 20:27:35,734 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 11 [2021-10-15 20:27:35,734 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [624340560] [2021-10-15 20:27:35,734 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-10-15 20:27:35,734 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-15 20:27:35,735 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-10-15 20:27:35,735 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=55, Unknown=0, NotChecked=0, Total=110 [2021-10-15 20:27:35,736 INFO L499 CegarLoopForPetriNet]: Number of universal loopers: 13 out of 26 [2021-10-15 20:27:35,736 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 75 places, 73 transitions, 430 flow. Second operand has 11 states, 11 states have (on average 15.181818181818182) internal successors, (167), 11 states have internal predecessors, (167), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-15 20:27:35,736 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-10-15 20:27:35,736 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 13 of 26 [2021-10-15 20:27:35,737 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-10-15 20:27:35,837 INFO L129 PetriNetUnfolder]: 19/109 cut-off events. [2021-10-15 20:27:35,837 INFO L130 PetriNetUnfolder]: For 303/303 co-relation queries the response was YES. [2021-10-15 20:27:35,838 INFO L84 FinitePrefix]: Finished finitePrefix Result has 402 conditions, 109 events. 19/109 cut-off events. For 303/303 co-relation queries the response was YES. Maximal size of possible extension queue 4. Compared 116 event pairs, 0 based on Foata normal form. 3/112 useless extension candidates. Maximal degree in co-relation 382. Up to 30 conditions per place. [2021-10-15 20:27:35,839 INFO L132 encePairwiseOnDemand]: 20/26 looper letters, 43 selfloop transitions, 22 changer transitions 0/91 dead transitions. [2021-10-15 20:27:35,839 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 84 places, 91 transitions, 634 flow [2021-10-15 20:27:35,839 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-10-15 20:27:35,839 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 10 states. [2021-10-15 20:27:35,840 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10 states to 10 states and 178 transitions. [2021-10-15 20:27:35,841 INFO L544 CegarLoopForPetriNet]: DFA transition density 0.6846153846153846 [2021-10-15 20:27:35,841 INFO L72 ComplementDD]: Start complementDD. Operand 10 states and 178 transitions. [2021-10-15 20:27:35,841 INFO L73 IsDeterministic]: Start isDeterministic. Operand 10 states and 178 transitions. [2021-10-15 20:27:35,841 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-10-15 20:27:35,841 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 10 states and 178 transitions. [2021-10-15 20:27:35,842 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 11 states, 10 states have (on average 17.8) internal successors, (178), 10 states have internal predecessors, (178), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-15 20:27:35,843 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 11 states, 11 states have (on average 26.0) internal successors, (286), 11 states have internal predecessors, (286), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-15 20:27:35,844 INFO L81 ComplementDD]: Finished complementDD. Result has 11 states, 11 states have (on average 26.0) internal successors, (286), 11 states have internal predecessors, (286), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-15 20:27:35,844 INFO L186 Difference]: Start difference. First operand has 75 places, 73 transitions, 430 flow. Second operand 10 states and 178 transitions. [2021-10-15 20:27:35,844 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 84 places, 91 transitions, 634 flow [2021-10-15 20:27:35,849 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 77 places, 91 transitions, 575 flow, removed 12 selfloop flow, removed 7 redundant places. [2021-10-15 20:27:35,851 INFO L242 Difference]: Finished difference. Result has 78 places, 75 transitions, 459 flow [2021-10-15 20:27:35,852 INFO L317 CegarLoopForPetriNet]: {PETRI_ALPHABET=26, PETRI_DIFFERENCE_MINUEND_FLOW=371, PETRI_DIFFERENCE_MINUEND_PLACES=68, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=73, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=20, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=51, PETRI_DIFFERENCE_SUBTRAHEND_STATES=10, PETRI_FLOW=459, PETRI_PLACES=78, PETRI_TRANSITIONS=75} [2021-10-15 20:27:35,852 INFO L334 CegarLoopForPetriNet]: 15 programPoint places, 63 predicate places. [2021-10-15 20:27:35,852 INFO L470 AbstractCegarLoop]: Abstraction has has 78 places, 75 transitions, 459 flow [2021-10-15 20:27:35,853 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 15.181818181818182) internal successors, (167), 11 states have internal predecessors, (167), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-15 20:27:35,853 INFO L246 CegarLoopForPetriNet]: Found error trace [2021-10-15 20:27:35,853 INFO L254 CegarLoopForPetriNet]: trace histogram [8, 8, 7, 7, 6, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-15 20:27:35,894 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-10-15 20:27:36,066 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-15 20:27:36,066 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-15 20:27:36,066 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-15 20:27:36,066 INFO L82 PathProgramCache]: Analyzing trace with hash -994163495, now seen corresponding path program 2 times [2021-10-15 20:27:36,066 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-15 20:27:36,067 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [167045007] [2021-10-15 20:27:36,067 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-15 20:27:36,067 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-15 20:27:36,092 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-15 20:27:36,180 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 72 trivial. 0 not checked. [2021-10-15 20:27:36,181 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-15 20:27:36,181 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [167045007] [2021-10-15 20:27:36,181 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [167045007] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-15 20:27:36,181 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1008752733] [2021-10-15 20:27:36,181 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-10-15 20:27:36,182 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-15 20:27:36,182 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/z3 [2021-10-15 20:27:36,183 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-15 20:27:36,208 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-10-15 20:27:36,338 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-10-15 20:27:36,338 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-15 20:27:36,339 INFO L263 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 10 conjunts are in the unsatisfiable core [2021-10-15 20:27:36,342 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-15 20:27:36,473 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 72 trivial. 0 not checked. [2021-10-15 20:27:36,476 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1008752733] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-15 20:27:36,476 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-10-15 20:27:36,476 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 12 [2021-10-15 20:27:36,476 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1736962996] [2021-10-15 20:27:36,477 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-10-15 20:27:36,477 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-15 20:27:36,478 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-10-15 20:27:36,478 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132 [2021-10-15 20:27:36,478 INFO L499 CegarLoopForPetriNet]: Number of universal loopers: 13 out of 26 [2021-10-15 20:27:36,479 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 78 places, 75 transitions, 459 flow. Second operand has 12 states, 12 states have (on average 15.166666666666666) internal successors, (182), 12 states have internal predecessors, (182), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-15 20:27:36,479 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-10-15 20:27:36,479 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 13 of 26 [2021-10-15 20:27:36,479 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-10-15 20:27:36,598 INFO L129 PetriNetUnfolder]: 21/119 cut-off events. [2021-10-15 20:27:36,598 INFO L130 PetriNetUnfolder]: For 387/387 co-relation queries the response was YES. [2021-10-15 20:27:36,604 INFO L84 FinitePrefix]: Finished finitePrefix Result has 446 conditions, 119 events. 21/119 cut-off events. For 387/387 co-relation queries the response was YES. Maximal size of possible extension queue 4. Compared 126 event pairs, 0 based on Foata normal form. 3/122 useless extension candidates. Maximal degree in co-relation 425. Up to 34 conditions per place. [2021-10-15 20:27:36,605 INFO L132 encePairwiseOnDemand]: 20/26 looper letters, 48 selfloop transitions, 24 changer transitions 0/98 dead transitions. [2021-10-15 20:27:36,605 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 88 places, 98 transitions, 696 flow [2021-10-15 20:27:36,606 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-10-15 20:27:36,606 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 11 states. [2021-10-15 20:27:36,607 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 196 transitions. [2021-10-15 20:27:36,607 INFO L544 CegarLoopForPetriNet]: DFA transition density 0.6853146853146853 [2021-10-15 20:27:36,607 INFO L72 ComplementDD]: Start complementDD. Operand 11 states and 196 transitions. [2021-10-15 20:27:36,607 INFO L73 IsDeterministic]: Start isDeterministic. Operand 11 states and 196 transitions. [2021-10-15 20:27:36,608 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-10-15 20:27:36,608 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 11 states and 196 transitions. [2021-10-15 20:27:36,609 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 12 states, 11 states have (on average 17.818181818181817) internal successors, (196), 11 states have internal predecessors, (196), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-15 20:27:36,610 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 12 states, 12 states have (on average 26.0) internal successors, (312), 12 states have internal predecessors, (312), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-15 20:27:36,610 INFO L81 ComplementDD]: Finished complementDD. Result has 12 states, 12 states have (on average 26.0) internal successors, (312), 12 states have internal predecessors, (312), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-15 20:27:36,611 INFO L186 Difference]: Start difference. First operand has 78 places, 75 transitions, 459 flow. Second operand 11 states and 196 transitions. [2021-10-15 20:27:36,611 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 88 places, 98 transitions, 696 flow [2021-10-15 20:27:36,616 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 80 places, 98 transitions, 628 flow, removed 14 selfloop flow, removed 8 redundant places. [2021-10-15 20:27:36,619 INFO L242 Difference]: Finished difference. Result has 81 places, 77 transitions, 487 flow [2021-10-15 20:27:36,620 INFO L317 CegarLoopForPetriNet]: {PETRI_ALPHABET=26, PETRI_DIFFERENCE_MINUEND_FLOW=391, PETRI_DIFFERENCE_MINUEND_PLACES=70, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=75, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=22, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=51, PETRI_DIFFERENCE_SUBTRAHEND_STATES=11, PETRI_FLOW=487, PETRI_PLACES=81, PETRI_TRANSITIONS=77} [2021-10-15 20:27:36,620 INFO L334 CegarLoopForPetriNet]: 15 programPoint places, 66 predicate places. [2021-10-15 20:27:36,620 INFO L470 AbstractCegarLoop]: Abstraction has has 81 places, 77 transitions, 487 flow [2021-10-15 20:27:36,620 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 15.166666666666666) internal successors, (182), 12 states have internal predecessors, (182), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-15 20:27:36,621 INFO L246 CegarLoopForPetriNet]: Found error trace [2021-10-15 20:27:36,621 INFO L254 CegarLoopForPetriNet]: trace histogram [9, 9, 8, 8, 7, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-15 20:27:36,661 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-10-15 20:27:36,835 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2021-10-15 20:27:36,835 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-15 20:27:36,836 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-15 20:27:36,836 INFO L82 PathProgramCache]: Analyzing trace with hash 1008939767, now seen corresponding path program 3 times [2021-10-15 20:27:36,836 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-15 20:27:36,836 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1864276731] [2021-10-15 20:27:36,836 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-15 20:27:36,836 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-15 20:27:36,857 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-15 20:27:36,948 INFO L134 CoverageAnalysis]: Checked inductivity of 175 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 94 trivial. 0 not checked. [2021-10-15 20:27:36,948 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-15 20:27:36,948 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1864276731] [2021-10-15 20:27:36,948 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1864276731] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-15 20:27:36,949 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [345027681] [2021-10-15 20:27:36,949 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-10-15 20:27:36,949 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-15 20:27:36,949 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/z3 [2021-10-15 20:27:36,960 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-15 20:27:36,963 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-10-15 20:27:37,106 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-10-15 20:27:37,106 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-15 20:27:37,108 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 21 conjunts are in the unsatisfiable core [2021-10-15 20:27:37,111 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-15 20:27:37,777 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-10-15 20:27:37,777 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 44 treesize of output 28 [2021-10-15 20:27:37,810 INFO L134 CoverageAnalysis]: Checked inductivity of 175 backedges. 0 proven. 17 refuted. 0 times theorem prover too weak. 158 trivial. 0 not checked. [2021-10-15 20:27:37,810 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [345027681] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-15 20:27:37,810 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-10-15 20:27:37,811 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11] total 21 [2021-10-15 20:27:37,812 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1045558385] [2021-10-15 20:27:37,813 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2021-10-15 20:27:37,813 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-15 20:27:37,814 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-10-15 20:27:37,814 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=106, Invalid=314, Unknown=0, NotChecked=0, Total=420 [2021-10-15 20:27:37,815 INFO L499 CegarLoopForPetriNet]: Number of universal loopers: 4 out of 26 [2021-10-15 20:27:37,815 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 81 places, 77 transitions, 487 flow. Second operand has 21 states, 21 states have (on average 6.380952380952381) internal successors, (134), 21 states have internal predecessors, (134), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-15 20:27:37,815 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-10-15 20:27:37,815 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 4 of 26 [2021-10-15 20:27:37,815 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-10-15 20:27:38,531 INFO L129 PetriNetUnfolder]: 32/183 cut-off events. [2021-10-15 20:27:38,531 INFO L130 PetriNetUnfolder]: For 555/555 co-relation queries the response was YES. [2021-10-15 20:27:38,532 INFO L84 FinitePrefix]: Finished finitePrefix Result has 730 conditions, 183 events. 32/183 cut-off events. For 555/555 co-relation queries the response was YES. Maximal size of possible extension queue 6. Compared 313 event pairs, 0 based on Foata normal form. 6/172 useless extension candidates. Maximal degree in co-relation 708. Up to 54 conditions per place. [2021-10-15 20:27:38,534 INFO L132 encePairwiseOnDemand]: 12/26 looper letters, 111 selfloop transitions, 46 changer transitions 0/159 dead transitions. [2021-10-15 20:27:38,534 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 110 places, 159 transitions, 1207 flow [2021-10-15 20:27:38,535 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-10-15 20:27:38,535 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2021-10-15 20:27:38,537 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 246 transitions. [2021-10-15 20:27:38,538 INFO L544 CegarLoopForPetriNet]: DFA transition density 0.3153846153846154 [2021-10-15 20:27:38,538 INFO L72 ComplementDD]: Start complementDD. Operand 30 states and 246 transitions. [2021-10-15 20:27:38,538 INFO L73 IsDeterministic]: Start isDeterministic. Operand 30 states and 246 transitions. [2021-10-15 20:27:38,539 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-10-15 20:27:38,539 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 30 states and 246 transitions. [2021-10-15 20:27:38,540 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 31 states, 30 states have (on average 8.2) internal successors, (246), 30 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) [2021-10-15 20:27:38,543 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 31 states, 31 states have (on average 26.0) internal successors, (806), 31 states have internal predecessors, (806), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-15 20:27:38,544 INFO L81 ComplementDD]: Finished complementDD. Result has 31 states, 31 states have (on average 26.0) internal successors, (806), 31 states have internal predecessors, (806), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-15 20:27:38,544 INFO L186 Difference]: Start difference. First operand has 81 places, 77 transitions, 487 flow. Second operand 30 states and 246 transitions. [2021-10-15 20:27:38,544 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 110 places, 159 transitions, 1207 flow [2021-10-15 20:27:38,552 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 101 places, 159 transitions, 1103 flow, removed 24 selfloop flow, removed 9 redundant places. [2021-10-15 20:27:38,556 INFO L242 Difference]: Finished difference. Result has 109 places, 93 transitions, 690 flow [2021-10-15 20:27:38,557 INFO L317 CegarLoopForPetriNet]: {PETRI_ALPHABET=26, PETRI_DIFFERENCE_MINUEND_FLOW=411, PETRI_DIFFERENCE_MINUEND_PLACES=72, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=77, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=30, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=39, PETRI_DIFFERENCE_SUBTRAHEND_STATES=30, PETRI_FLOW=690, PETRI_PLACES=109, PETRI_TRANSITIONS=93} [2021-10-15 20:27:38,557 INFO L334 CegarLoopForPetriNet]: 15 programPoint places, 94 predicate places. [2021-10-15 20:27:38,557 INFO L470 AbstractCegarLoop]: Abstraction has has 109 places, 93 transitions, 690 flow [2021-10-15 20:27:38,558 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 21 states have (on average 6.380952380952381) internal successors, (134), 21 states have internal predecessors, (134), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-15 20:27:38,558 INFO L246 CegarLoopForPetriNet]: Found error trace [2021-10-15 20:27:38,558 INFO L254 CegarLoopForPetriNet]: trace histogram [10, 10, 9, 9, 7, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-15 20:27:38,596 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-10-15 20:27:38,784 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-10-15 20:27:38,784 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-15 20:27:38,784 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-15 20:27:38,784 INFO L82 PathProgramCache]: Analyzing trace with hash 1897957149, now seen corresponding path program 4 times [2021-10-15 20:27:38,785 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-15 20:27:38,785 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1384723999] [2021-10-15 20:27:38,785 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-15 20:27:38,785 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-15 20:27:38,837 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-15 20:27:38,982 INFO L134 CoverageAnalysis]: Checked inductivity of 219 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 119 trivial. 0 not checked. [2021-10-15 20:27:38,982 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-15 20:27:38,983 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1384723999] [2021-10-15 20:27:38,983 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1384723999] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-15 20:27:38,983 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1185280771] [2021-10-15 20:27:38,983 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-10-15 20:27:38,983 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-15 20:27:38,984 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/z3 [2021-10-15 20:27:38,985 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-15 20:27:39,003 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-10-15 20:27:39,199 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-10-15 20:27:39,200 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-15 20:27:39,201 INFO L263 TraceCheckSpWp]: Trace formula consists of 192 conjuncts, 12 conjunts are in the unsatisfiable core [2021-10-15 20:27:39,216 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-15 20:27:39,359 INFO L134 CoverageAnalysis]: Checked inductivity of 219 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 119 trivial. 0 not checked. [2021-10-15 20:27:39,359 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1185280771] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-15 20:27:39,360 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-10-15 20:27:39,360 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 14 [2021-10-15 20:27:39,360 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1224311737] [2021-10-15 20:27:39,360 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-10-15 20:27:39,361 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-15 20:27:39,361 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-10-15 20:27:39,361 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=91, Invalid=91, Unknown=0, NotChecked=0, Total=182 [2021-10-15 20:27:39,362 INFO L499 CegarLoopForPetriNet]: Number of universal loopers: 13 out of 26 [2021-10-15 20:27:39,362 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 109 places, 93 transitions, 690 flow. Second operand has 14 states, 14 states have (on average 15.142857142857142) internal successors, (212), 14 states have internal predecessors, (212), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-15 20:27:39,363 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-10-15 20:27:39,363 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 13 of 26 [2021-10-15 20:27:39,363 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-10-15 20:27:39,497 INFO L129 PetriNetUnfolder]: 35/197 cut-off events. [2021-10-15 20:27:39,497 INFO L130 PetriNetUnfolder]: For 955/955 co-relation queries the response was YES. [2021-10-15 20:27:39,499 INFO L84 FinitePrefix]: Finished finitePrefix Result has 790 conditions, 197 events. 35/197 cut-off events. For 955/955 co-relation queries the response was YES. Maximal size of possible extension queue 6. Compared 334 event pairs, 0 based on Foata normal form. 4/201 useless extension candidates. Maximal degree in co-relation 760. Up to 60 conditions per place. [2021-10-15 20:27:39,500 INFO L132 encePairwiseOnDemand]: 20/26 looper letters, 58 selfloop transitions, 36 changer transitions 0/126 dead transitions. [2021-10-15 20:27:39,501 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 121 places, 126 transitions, 1011 flow [2021-10-15 20:27:39,501 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-10-15 20:27:39,501 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2021-10-15 20:27:39,502 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 232 transitions. [2021-10-15 20:27:39,503 INFO L544 CegarLoopForPetriNet]: DFA transition density 0.6863905325443787 [2021-10-15 20:27:39,503 INFO L72 ComplementDD]: Start complementDD. Operand 13 states and 232 transitions. [2021-10-15 20:27:39,503 INFO L73 IsDeterministic]: Start isDeterministic. Operand 13 states and 232 transitions. [2021-10-15 20:27:39,503 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-10-15 20:27:39,504 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 13 states and 232 transitions. [2021-10-15 20:27:39,504 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 14 states, 13 states have (on average 17.846153846153847) internal successors, (232), 13 states have internal predecessors, (232), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-15 20:27:39,506 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 14 states, 14 states have (on average 26.0) internal successors, (364), 14 states have internal predecessors, (364), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-15 20:27:39,507 INFO L81 ComplementDD]: Finished complementDD. Result has 14 states, 14 states have (on average 26.0) internal successors, (364), 14 states have internal predecessors, (364), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-15 20:27:39,507 INFO L186 Difference]: Start difference. First operand has 109 places, 93 transitions, 690 flow. Second operand 13 states and 232 transitions. [2021-10-15 20:27:39,507 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 121 places, 126 transitions, 1011 flow [2021-10-15 20:27:39,521 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 112 places, 126 transitions, 909 flow, removed 33 selfloop flow, removed 9 redundant places. [2021-10-15 20:27:39,525 INFO L242 Difference]: Finished difference. Result has 113 places, 95 transitions, 719 flow [2021-10-15 20:27:39,526 INFO L317 CegarLoopForPetriNet]: {PETRI_ALPHABET=26, PETRI_DIFFERENCE_MINUEND_FLOW=588, PETRI_DIFFERENCE_MINUEND_PLACES=100, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=93, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=34, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=57, PETRI_DIFFERENCE_SUBTRAHEND_STATES=13, PETRI_FLOW=719, PETRI_PLACES=113, PETRI_TRANSITIONS=95} [2021-10-15 20:27:39,526 INFO L334 CegarLoopForPetriNet]: 15 programPoint places, 98 predicate places. [2021-10-15 20:27:39,526 INFO L470 AbstractCegarLoop]: Abstraction has has 113 places, 95 transitions, 719 flow [2021-10-15 20:27:39,527 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 15.142857142857142) internal successors, (212), 14 states have internal predecessors, (212), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-15 20:27:39,527 INFO L246 CegarLoopForPetriNet]: Found error trace [2021-10-15 20:27:39,527 INFO L254 CegarLoopForPetriNet]: trace histogram [11, 11, 10, 10, 9, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-15 20:27:39,564 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-10-15 20:27:39,752 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-10-15 20:27:39,752 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-15 20:27:39,752 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-15 20:27:39,752 INFO L82 PathProgramCache]: Analyzing trace with hash 1882282935, now seen corresponding path program 5 times [2021-10-15 20:27:39,752 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-15 20:27:39,753 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2134286445] [2021-10-15 20:27:39,753 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-15 20:27:39,753 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-15 20:27:39,782 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-15 20:27:39,916 INFO L134 CoverageAnalysis]: Checked inductivity of 268 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 147 trivial. 0 not checked. [2021-10-15 20:27:39,916 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-15 20:27:39,916 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2134286445] [2021-10-15 20:27:39,916 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2134286445] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-15 20:27:39,917 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1297715497] [2021-10-15 20:27:39,917 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-10-15 20:27:39,917 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-15 20:27:39,917 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/z3 [2021-10-15 20:27:39,918 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-15 20:27:39,944 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-10-15 20:27:40,291 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 12 check-sat command(s) [2021-10-15 20:27:40,291 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-15 20:27:40,294 INFO L263 TraceCheckSpWp]: Trace formula consists of 192 conjuncts, 13 conjunts are in the unsatisfiable core [2021-10-15 20:27:40,297 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-15 20:27:40,505 INFO L134 CoverageAnalysis]: Checked inductivity of 268 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 147 trivial. 0 not checked. [2021-10-15 20:27:40,506 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1297715497] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-15 20:27:40,506 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-10-15 20:27:40,506 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 15 [2021-10-15 20:27:40,506 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [574236349] [2021-10-15 20:27:40,506 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-10-15 20:27:40,506 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-15 20:27:40,507 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-10-15 20:27:40,507 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=105, Unknown=0, NotChecked=0, Total=210 [2021-10-15 20:27:40,507 INFO L499 CegarLoopForPetriNet]: Number of universal loopers: 13 out of 26 [2021-10-15 20:27:40,508 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 113 places, 95 transitions, 719 flow. Second operand has 15 states, 15 states have (on average 15.133333333333333) internal successors, (227), 15 states have internal predecessors, (227), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-15 20:27:40,508 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-10-15 20:27:40,508 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 13 of 26 [2021-10-15 20:27:40,508 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-10-15 20:27:40,664 INFO L129 PetriNetUnfolder]: 38/211 cut-off events. [2021-10-15 20:27:40,664 INFO L130 PetriNetUnfolder]: For 1153/1153 co-relation queries the response was YES. [2021-10-15 20:27:40,665 INFO L84 FinitePrefix]: Finished finitePrefix Result has 855 conditions, 211 events. 38/211 cut-off events. For 1153/1153 co-relation queries the response was YES. Maximal size of possible extension queue 6. Compared 352 event pairs, 0 based on Foata normal form. 4/215 useless extension candidates. Maximal degree in co-relation 824. Up to 66 conditions per place. [2021-10-15 20:27:40,668 INFO L132 encePairwiseOnDemand]: 20/26 looper letters, 63 selfloop transitions, 38 changer transitions 0/133 dead transitions. [2021-10-15 20:27:40,668 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 126 places, 133 transitions, 1073 flow [2021-10-15 20:27:40,669 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-10-15 20:27:40,669 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2021-10-15 20:27:40,671 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 250 transitions. [2021-10-15 20:27:40,672 INFO L544 CegarLoopForPetriNet]: DFA transition density 0.6868131868131868 [2021-10-15 20:27:40,672 INFO L72 ComplementDD]: Start complementDD. Operand 14 states and 250 transitions. [2021-10-15 20:27:40,672 INFO L73 IsDeterministic]: Start isDeterministic. Operand 14 states and 250 transitions. [2021-10-15 20:27:40,673 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-10-15 20:27:40,673 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 14 states and 250 transitions. [2021-10-15 20:27:40,674 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 15 states, 14 states have (on average 17.857142857142858) internal successors, (250), 14 states have internal predecessors, (250), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-15 20:27:40,675 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 15 states, 15 states have (on average 26.0) internal successors, (390), 15 states have internal predecessors, (390), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-15 20:27:40,675 INFO L81 ComplementDD]: Finished complementDD. Result has 15 states, 15 states have (on average 26.0) internal successors, (390), 15 states have internal predecessors, (390), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-15 20:27:40,676 INFO L186 Difference]: Start difference. First operand has 113 places, 95 transitions, 719 flow. Second operand 14 states and 250 transitions. [2021-10-15 20:27:40,676 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 126 places, 133 transitions, 1073 flow [2021-10-15 20:27:40,690 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 115 places, 133 transitions, 964 flow, removed 21 selfloop flow, removed 11 redundant places. [2021-10-15 20:27:40,695 INFO L242 Difference]: Finished difference. Result has 116 places, 97 transitions, 748 flow [2021-10-15 20:27:40,696 INFO L317 CegarLoopForPetriNet]: {PETRI_ALPHABET=26, PETRI_DIFFERENCE_MINUEND_FLOW=610, PETRI_DIFFERENCE_MINUEND_PLACES=102, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=95, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=36, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=57, PETRI_DIFFERENCE_SUBTRAHEND_STATES=14, PETRI_FLOW=748, PETRI_PLACES=116, PETRI_TRANSITIONS=97} [2021-10-15 20:27:40,696 INFO L334 CegarLoopForPetriNet]: 15 programPoint places, 101 predicate places. [2021-10-15 20:27:40,696 INFO L470 AbstractCegarLoop]: Abstraction has has 116 places, 97 transitions, 748 flow [2021-10-15 20:27:40,697 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 15.133333333333333) internal successors, (227), 15 states have internal predecessors, (227), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-15 20:27:40,697 INFO L246 CegarLoopForPetriNet]: Found error trace [2021-10-15 20:27:40,697 INFO L254 CegarLoopForPetriNet]: trace histogram [12, 12, 11, 11, 10, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-15 20:27:40,739 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-10-15 20:27:40,920 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-10-15 20:27:40,920 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-15 20:27:40,920 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-15 20:27:40,920 INFO L82 PathProgramCache]: Analyzing trace with hash 511341341, now seen corresponding path program 6 times [2021-10-15 20:27:40,920 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-15 20:27:40,921 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1162618792] [2021-10-15 20:27:40,921 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-15 20:27:40,921 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-15 20:27:40,949 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-15 20:27:41,088 INFO L134 CoverageAnalysis]: Checked inductivity of 322 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 178 trivial. 0 not checked. [2021-10-15 20:27:41,089 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-15 20:27:41,089 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1162618792] [2021-10-15 20:27:41,089 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1162618792] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-15 20:27:41,089 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [394137974] [2021-10-15 20:27:41,089 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-10-15 20:27:41,090 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-15 20:27:41,090 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/z3 [2021-10-15 20:27:41,091 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-15 20:27:41,119 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-10-15 20:27:41,336 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 5 check-sat command(s) [2021-10-15 20:27:41,337 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-15 20:27:41,338 INFO L263 TraceCheckSpWp]: Trace formula consists of 108 conjuncts, 11 conjunts are in the unsatisfiable core [2021-10-15 20:27:41,340 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-15 20:27:41,664 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 37 treesize of output 25 [2021-10-15 20:27:41,691 INFO L134 CoverageAnalysis]: Checked inductivity of 322 backedges. 0 proven. 23 refuted. 0 times theorem prover too weak. 299 trivial. 0 not checked. [2021-10-15 20:27:41,691 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [394137974] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-15 20:27:41,691 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-10-15 20:27:41,692 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 7] total 20 [2021-10-15 20:27:41,692 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1359497098] [2021-10-15 20:27:41,693 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2021-10-15 20:27:41,693 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-15 20:27:41,694 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-10-15 20:27:41,695 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=129, Invalid=251, Unknown=0, NotChecked=0, Total=380 [2021-10-15 20:27:41,695 INFO L499 CegarLoopForPetriNet]: Number of universal loopers: 4 out of 26 [2021-10-15 20:27:41,696 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 116 places, 97 transitions, 748 flow. Second operand has 20 states, 20 states have (on average 6.75) internal successors, (135), 20 states have internal predecessors, (135), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-15 20:27:41,696 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-10-15 20:27:41,696 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 4 of 26 [2021-10-15 20:27:41,696 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-10-15 20:27:42,184 INFO L129 PetriNetUnfolder]: 53/287 cut-off events. [2021-10-15 20:27:42,184 INFO L130 PetriNetUnfolder]: For 1455/1455 co-relation queries the response was YES. [2021-10-15 20:27:42,186 INFO L84 FinitePrefix]: Finished finitePrefix Result has 1243 conditions, 287 events. 53/287 cut-off events. For 1455/1455 co-relation queries the response was YES. Maximal size of possible extension queue 8. Compared 692 event pairs, 0 based on Foata normal form. 6/259 useless extension candidates. Maximal degree in co-relation 1211. Up to 94 conditions per place. [2021-10-15 20:27:42,189 INFO L132 encePairwiseOnDemand]: 15/26 looper letters, 141 selfloop transitions, 69 changer transitions 0/212 dead transitions. [2021-10-15 20:27:42,189 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 147 places, 212 transitions, 1763 flow [2021-10-15 20:27:42,190 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-10-15 20:27:42,190 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2021-10-15 20:27:42,191 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 284 transitions. [2021-10-15 20:27:42,192 INFO L544 CegarLoopForPetriNet]: DFA transition density 0.34134615384615385 [2021-10-15 20:27:42,192 INFO L72 ComplementDD]: Start complementDD. Operand 32 states and 284 transitions. [2021-10-15 20:27:42,192 INFO L73 IsDeterministic]: Start isDeterministic. Operand 32 states and 284 transitions. [2021-10-15 20:27:42,193 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-10-15 20:27:42,193 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 32 states and 284 transitions. [2021-10-15 20:27:42,194 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 33 states, 32 states have (on average 8.875) internal successors, (284), 32 states have internal predecessors, (284), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-15 20:27:42,196 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 33 states, 33 states have (on average 26.0) internal successors, (858), 33 states have internal predecessors, (858), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-15 20:27:42,197 INFO L81 ComplementDD]: Finished complementDD. Result has 33 states, 33 states have (on average 26.0) internal successors, (858), 33 states have internal predecessors, (858), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-15 20:27:42,197 INFO L186 Difference]: Start difference. First operand has 116 places, 97 transitions, 748 flow. Second operand 32 states and 284 transitions. [2021-10-15 20:27:42,197 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 147 places, 212 transitions, 1763 flow [2021-10-15 20:27:42,214 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 135 places, 212 transitions, 1603 flow, removed 35 selfloop flow, removed 12 redundant places. [2021-10-15 20:27:42,219 INFO L242 Difference]: Finished difference. Result has 151 places, 126 transitions, 1083 flow [2021-10-15 20:27:42,220 INFO L317 CegarLoopForPetriNet]: {PETRI_ALPHABET=26, PETRI_DIFFERENCE_MINUEND_FLOW=630, PETRI_DIFFERENCE_MINUEND_PLACES=104, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=97, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=40, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=46, PETRI_DIFFERENCE_SUBTRAHEND_STATES=32, PETRI_FLOW=1083, PETRI_PLACES=151, PETRI_TRANSITIONS=126} [2021-10-15 20:27:42,220 INFO L334 CegarLoopForPetriNet]: 15 programPoint places, 136 predicate places. [2021-10-15 20:27:42,220 INFO L470 AbstractCegarLoop]: Abstraction has has 151 places, 126 transitions, 1083 flow [2021-10-15 20:27:42,221 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 6.75) internal successors, (135), 20 states have internal predecessors, (135), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-15 20:27:42,221 INFO L246 CegarLoopForPetriNet]: Found error trace [2021-10-15 20:27:42,221 INFO L254 CegarLoopForPetriNet]: trace histogram [13, 13, 12, 12, 10, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-15 20:27:42,259 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2021-10-15 20:27:42,448 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15,15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-15 20:27:42,448 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-15 20:27:42,448 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-15 20:27:42,448 INFO L82 PathProgramCache]: Analyzing trace with hash 1845676653, now seen corresponding path program 7 times [2021-10-15 20:27:42,449 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-15 20:27:42,449 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1161224153] [2021-10-15 20:27:42,449 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-15 20:27:42,449 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-15 20:27:42,489 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-15 20:27:42,644 INFO L134 CoverageAnalysis]: Checked inductivity of 381 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 212 trivial. 0 not checked. [2021-10-15 20:27:42,644 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-15 20:27:42,644 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1161224153] [2021-10-15 20:27:42,644 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1161224153] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-15 20:27:42,644 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1746169434] [2021-10-15 20:27:42,645 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-10-15 20:27:42,645 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-15 20:27:42,645 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/z3 [2021-10-15 20:27:42,648 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-15 20:27:42,672 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2021-10-15 20:27:42,917 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-15 20:27:42,918 INFO L263 TraceCheckSpWp]: Trace formula consists of 234 conjuncts, 15 conjunts are in the unsatisfiable core [2021-10-15 20:27:42,929 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-15 20:27:43,104 INFO L134 CoverageAnalysis]: Checked inductivity of 381 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 212 trivial. 0 not checked. [2021-10-15 20:27:43,105 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1746169434] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-15 20:27:43,105 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-10-15 20:27:43,105 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16] total 17 [2021-10-15 20:27:43,105 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [957489505] [2021-10-15 20:27:43,106 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2021-10-15 20:27:43,106 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-15 20:27:43,109 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-10-15 20:27:43,110 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=136, Invalid=136, Unknown=0, NotChecked=0, Total=272 [2021-10-15 20:27:43,110 INFO L499 CegarLoopForPetriNet]: Number of universal loopers: 13 out of 26 [2021-10-15 20:27:43,111 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 151 places, 126 transitions, 1083 flow. Second operand has 17 states, 17 states have (on average 15.117647058823529) internal successors, (257), 17 states have internal predecessors, (257), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-15 20:27:43,111 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-10-15 20:27:43,111 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 13 of 26 [2021-10-15 20:27:43,111 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-10-15 20:27:43,306 INFO L129 PetriNetUnfolder]: 57/305 cut-off events. [2021-10-15 20:27:43,306 INFO L130 PetriNetUnfolder]: For 2665/2665 co-relation queries the response was YES. [2021-10-15 20:27:43,309 INFO L84 FinitePrefix]: Finished finitePrefix Result has 1464 conditions, 305 events. 57/305 cut-off events. For 2665/2665 co-relation queries the response was YES. Maximal size of possible extension queue 8. Compared 727 event pairs, 0 based on Foata normal form. 5/310 useless extension candidates. Maximal degree in co-relation 1416. Up to 102 conditions per place. [2021-10-15 20:27:43,312 INFO L132 encePairwiseOnDemand]: 20/26 looper letters, 85 selfloop transitions, 53 changer transitions 0/175 dead transitions. [2021-10-15 20:27:43,312 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 166 places, 175 transitions, 1685 flow [2021-10-15 20:27:43,312 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-10-15 20:27:43,313 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2021-10-15 20:27:43,313 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 286 transitions. [2021-10-15 20:27:43,314 INFO L544 CegarLoopForPetriNet]: DFA transition density 0.6875 [2021-10-15 20:27:43,314 INFO L72 ComplementDD]: Start complementDD. Operand 16 states and 286 transitions. [2021-10-15 20:27:43,314 INFO L73 IsDeterministic]: Start isDeterministic. Operand 16 states and 286 transitions. [2021-10-15 20:27:43,315 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-10-15 20:27:43,315 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 16 states and 286 transitions. [2021-10-15 20:27:43,316 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 17 states, 16 states have (on average 17.875) internal successors, (286), 16 states have internal predecessors, (286), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-15 20:27:43,317 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 17 states, 17 states have (on average 26.0) internal successors, (442), 17 states have internal predecessors, (442), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-15 20:27:43,317 INFO L81 ComplementDD]: Finished complementDD. Result has 17 states, 17 states have (on average 26.0) internal successors, (442), 17 states have internal predecessors, (442), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-15 20:27:43,318 INFO L186 Difference]: Start difference. First operand has 151 places, 126 transitions, 1083 flow. Second operand 16 states and 286 transitions. [2021-10-15 20:27:43,318 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 166 places, 175 transitions, 1685 flow [2021-10-15 20:27:43,352 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 160 places, 175 transitions, 1561 flow, removed 48 selfloop flow, removed 6 redundant places. [2021-10-15 20:27:43,356 INFO L242 Difference]: Finished difference. Result has 161 places, 128 transitions, 1139 flow [2021-10-15 20:27:43,357 INFO L317 CegarLoopForPetriNet]: {PETRI_ALPHABET=26, PETRI_DIFFERENCE_MINUEND_FLOW=960, PETRI_DIFFERENCE_MINUEND_PLACES=145, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=126, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=51, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=73, PETRI_DIFFERENCE_SUBTRAHEND_STATES=16, PETRI_FLOW=1139, PETRI_PLACES=161, PETRI_TRANSITIONS=128} [2021-10-15 20:27:43,357 INFO L334 CegarLoopForPetriNet]: 15 programPoint places, 146 predicate places. [2021-10-15 20:27:43,358 INFO L470 AbstractCegarLoop]: Abstraction has has 161 places, 128 transitions, 1139 flow [2021-10-15 20:27:43,358 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 15.117647058823529) internal successors, (257), 17 states have internal predecessors, (257), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-15 20:27:43,358 INFO L246 CegarLoopForPetriNet]: Found error trace [2021-10-15 20:27:43,358 INFO L254 CegarLoopForPetriNet]: trace histogram [14, 14, 13, 13, 11, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-15 20:27:43,398 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2021-10-15 20:27:43,572 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-10-15 20:27:43,572 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-15 20:27:43,572 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-15 20:27:43,572 INFO L82 PathProgramCache]: Analyzing trace with hash -1965835037, now seen corresponding path program 8 times [2021-10-15 20:27:43,572 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-15 20:27:43,573 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [577971818] [2021-10-15 20:27:43,573 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-15 20:27:43,573 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-15 20:27:43,615 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-15 20:27:43,786 INFO L134 CoverageAnalysis]: Checked inductivity of 445 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 249 trivial. 0 not checked. [2021-10-15 20:27:43,786 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-15 20:27:43,786 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [577971818] [2021-10-15 20:27:43,787 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [577971818] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-15 20:27:43,787 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [469717118] [2021-10-15 20:27:43,787 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-10-15 20:27:43,787 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-15 20:27:43,787 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/z3 [2021-10-15 20:27:43,788 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-15 20:27:43,814 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2021-10-15 20:27:44,058 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-10-15 20:27:44,058 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-15 20:27:44,060 INFO L263 TraceCheckSpWp]: Trace formula consists of 230 conjuncts, 16 conjunts are in the unsatisfiable core [2021-10-15 20:27:44,062 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-15 20:27:44,248 INFO L134 CoverageAnalysis]: Checked inductivity of 445 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 249 trivial. 0 not checked. [2021-10-15 20:27:44,248 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [469717118] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-15 20:27:44,248 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-10-15 20:27:44,248 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17] total 18 [2021-10-15 20:27:44,249 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1353296050] [2021-10-15 20:27:44,249 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-10-15 20:27:44,250 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-15 20:27:44,250 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-10-15 20:27:44,251 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=153, Invalid=153, Unknown=0, NotChecked=0, Total=306 [2021-10-15 20:27:44,251 INFO L499 CegarLoopForPetriNet]: Number of universal loopers: 13 out of 26 [2021-10-15 20:27:44,252 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 161 places, 128 transitions, 1139 flow. Second operand has 18 states, 18 states have (on average 15.11111111111111) internal successors, (272), 18 states have internal predecessors, (272), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-15 20:27:44,252 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-10-15 20:27:44,252 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 13 of 26 [2021-10-15 20:27:44,252 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-10-15 20:27:44,476 INFO L129 PetriNetUnfolder]: 61/323 cut-off events. [2021-10-15 20:27:44,476 INFO L130 PetriNetUnfolder]: For 3159/3159 co-relation queries the response was YES. [2021-10-15 20:27:44,480 INFO L84 FinitePrefix]: Finished finitePrefix Result has 1587 conditions, 323 events. 61/323 cut-off events. For 3159/3159 co-relation queries the response was YES. Maximal size of possible extension queue 8. Compared 771 event pairs, 0 based on Foata normal form. 5/328 useless extension candidates. Maximal degree in co-relation 1538. Up to 110 conditions per place. [2021-10-15 20:27:44,483 INFO L132 encePairwiseOnDemand]: 20/26 looper letters, 91 selfloop transitions, 55 changer transitions 0/183 dead transitions. [2021-10-15 20:27:44,483 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 177 places, 183 transitions, 1796 flow [2021-10-15 20:27:44,483 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-10-15 20:27:44,483 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2021-10-15 20:27:44,484 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 304 transitions. [2021-10-15 20:27:44,485 INFO L544 CegarLoopForPetriNet]: DFA transition density 0.6877828054298643 [2021-10-15 20:27:44,485 INFO L72 ComplementDD]: Start complementDD. Operand 17 states and 304 transitions. [2021-10-15 20:27:44,486 INFO L73 IsDeterministic]: Start isDeterministic. Operand 17 states and 304 transitions. [2021-10-15 20:27:44,486 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-10-15 20:27:44,486 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 17 states and 304 transitions. [2021-10-15 20:27:44,487 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 18 states, 17 states have (on average 17.88235294117647) internal successors, (304), 17 states have internal predecessors, (304), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-15 20:27:44,489 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 18 states, 18 states have (on average 26.0) internal successors, (468), 18 states have internal predecessors, (468), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-15 20:27:44,490 INFO L81 ComplementDD]: Finished complementDD. Result has 18 states, 18 states have (on average 26.0) internal successors, (468), 18 states have internal predecessors, (468), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-15 20:27:44,490 INFO L186 Difference]: Start difference. First operand has 161 places, 128 transitions, 1139 flow. Second operand 17 states and 304 transitions. [2021-10-15 20:27:44,490 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 177 places, 183 transitions, 1796 flow [2021-10-15 20:27:44,520 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 163 places, 183 transitions, 1641 flow, removed 27 selfloop flow, removed 14 redundant places. [2021-10-15 20:27:44,527 INFO L242 Difference]: Finished difference. Result has 164 places, 130 transitions, 1170 flow [2021-10-15 20:27:44,528 INFO L317 CegarLoopForPetriNet]: {PETRI_ALPHABET=26, PETRI_DIFFERENCE_MINUEND_FLOW=984, PETRI_DIFFERENCE_MINUEND_PLACES=147, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=128, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=53, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=73, PETRI_DIFFERENCE_SUBTRAHEND_STATES=17, PETRI_FLOW=1170, PETRI_PLACES=164, PETRI_TRANSITIONS=130} [2021-10-15 20:27:44,528 INFO L334 CegarLoopForPetriNet]: 15 programPoint places, 149 predicate places. [2021-10-15 20:27:44,528 INFO L470 AbstractCegarLoop]: Abstraction has has 164 places, 130 transitions, 1170 flow [2021-10-15 20:27:44,529 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 15.11111111111111) internal successors, (272), 18 states have internal predecessors, (272), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-15 20:27:44,529 INFO L246 CegarLoopForPetriNet]: Found error trace [2021-10-15 20:27:44,529 INFO L254 CegarLoopForPetriNet]: trace histogram [15, 15, 14, 14, 12, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-15 20:27:44,571 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2021-10-15 20:27:44,744 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-10-15 20:27:44,744 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-15 20:27:44,744 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-15 20:27:44,744 INFO L82 PathProgramCache]: Analyzing trace with hash -103692755, now seen corresponding path program 9 times [2021-10-15 20:27:44,744 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-15 20:27:44,745 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [169282774] [2021-10-15 20:27:44,745 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-15 20:27:44,745 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-15 20:27:44,769 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-15 20:27:44,956 INFO L134 CoverageAnalysis]: Checked inductivity of 514 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 289 trivial. 0 not checked. [2021-10-15 20:27:44,957 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-15 20:27:44,957 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [169282774] [2021-10-15 20:27:44,957 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [169282774] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-15 20:27:44,957 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2133988574] [2021-10-15 20:27:44,958 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-10-15 20:27:44,958 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-15 20:27:44,958 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/z3 [2021-10-15 20:27:44,960 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-15 20:27:44,987 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2021-10-15 20:27:45,248 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2021-10-15 20:27:45,248 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-15 20:27:45,249 INFO L263 TraceCheckSpWp]: Trace formula consists of 128 conjuncts, 18 conjunts are in the unsatisfiable core [2021-10-15 20:27:45,273 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-15 20:27:46,016 INFO L354 Elim1Store]: treesize reduction 8, result has 42.9 percent of original size [2021-10-15 20:27:46,016 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 56 treesize of output 34 [2021-10-15 20:27:46,047 INFO L134 CoverageAnalysis]: Checked inductivity of 514 backedges. 26 proven. 70 refuted. 0 times theorem prover too weak. 418 trivial. 0 not checked. [2021-10-15 20:27:46,048 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2133988574] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-15 20:27:46,048 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-10-15 20:27:46,048 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 10] total 25 [2021-10-15 20:27:46,048 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [569462982] [2021-10-15 20:27:46,049 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2021-10-15 20:27:46,050 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-15 20:27:46,050 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-10-15 20:27:46,051 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=188, Invalid=412, Unknown=0, NotChecked=0, Total=600 [2021-10-15 20:27:46,051 INFO L499 CegarLoopForPetriNet]: Number of universal loopers: 4 out of 26 [2021-10-15 20:27:46,052 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 164 places, 130 transitions, 1170 flow. Second operand has 25 states, 25 states have (on average 6.56) internal successors, (164), 25 states have internal predecessors, (164), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-15 20:27:46,052 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-10-15 20:27:46,052 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 4 of 26 [2021-10-15 20:27:46,052 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-10-15 20:27:48,273 INFO L129 PetriNetUnfolder]: 65/345 cut-off events. [2021-10-15 20:27:48,273 INFO L130 PetriNetUnfolder]: For 3180/3180 co-relation queries the response was YES. [2021-10-15 20:27:48,279 INFO L84 FinitePrefix]: Finished finitePrefix Result has 1807 conditions, 345 events. 65/345 cut-off events. For 3180/3180 co-relation queries the response was YES. Maximal size of possible extension queue 8. Compared 834 event pairs, 0 based on Foata normal form. 6/351 useless extension candidates. Maximal degree in co-relation 1757. Up to 118 conditions per place. [2021-10-15 20:27:48,283 INFO L132 encePairwiseOnDemand]: 13/26 looper letters, 147 selfloop transitions, 159 changer transitions 0/308 dead transitions. [2021-10-15 20:27:48,284 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 245 places, 308 transitions, 3099 flow [2021-10-15 20:27:48,284 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 82 states. [2021-10-15 20:27:48,284 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 82 states. [2021-10-15 20:27:48,296 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 578 transitions. [2021-10-15 20:27:48,299 INFO L544 CegarLoopForPetriNet]: DFA transition density 0.27110694183864914 [2021-10-15 20:27:48,300 INFO L72 ComplementDD]: Start complementDD. Operand 82 states and 578 transitions. [2021-10-15 20:27:48,301 INFO L73 IsDeterministic]: Start isDeterministic. Operand 82 states and 578 transitions. [2021-10-15 20:27:48,302 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-10-15 20:27:48,303 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 82 states and 578 transitions. [2021-10-15 20:27:48,306 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 83 states, 82 states have (on average 7.048780487804878) internal successors, (578), 82 states have internal predecessors, (578), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-15 20:27:48,315 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 83 states, 83 states have (on average 26.0) internal successors, (2158), 83 states have internal predecessors, (2158), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-15 20:27:48,317 INFO L81 ComplementDD]: Finished complementDD. Result has 83 states, 83 states have (on average 26.0) internal successors, (2158), 83 states have internal predecessors, (2158), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-15 20:27:48,317 INFO L186 Difference]: Start difference. First operand has 164 places, 130 transitions, 1170 flow. Second operand 82 states and 578 transitions. [2021-10-15 20:27:48,317 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 245 places, 308 transitions, 3099 flow [2021-10-15 20:27:48,368 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 230 places, 308 transitions, 2865 flow, removed 59 selfloop flow, removed 15 redundant places. [2021-10-15 20:27:48,375 INFO L242 Difference]: Finished difference. Result has 250 places, 237 transitions, 2183 flow [2021-10-15 20:27:48,376 INFO L317 CegarLoopForPetriNet]: {PETRI_ALPHABET=26, PETRI_DIFFERENCE_MINUEND_FLOW=1006, PETRI_DIFFERENCE_MINUEND_PLACES=149, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=130, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=80, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=41, PETRI_DIFFERENCE_SUBTRAHEND_STATES=82, PETRI_FLOW=2183, PETRI_PLACES=250, PETRI_TRANSITIONS=237} [2021-10-15 20:27:48,376 INFO L334 CegarLoopForPetriNet]: 15 programPoint places, 235 predicate places. [2021-10-15 20:27:48,376 INFO L470 AbstractCegarLoop]: Abstraction has has 250 places, 237 transitions, 2183 flow [2021-10-15 20:27:48,376 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 6.56) internal successors, (164), 25 states have internal predecessors, (164), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-15 20:27:48,377 INFO L246 CegarLoopForPetriNet]: Found error trace [2021-10-15 20:27:48,377 INFO L254 CegarLoopForPetriNet]: trace histogram [16, 16, 15, 15, 13, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-15 20:27:48,408 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2021-10-15 20:27:48,592 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-15 20:27:48,592 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-15 20:27:48,592 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-15 20:27:48,592 INFO L82 PathProgramCache]: Analyzing trace with hash 51078301, now seen corresponding path program 10 times [2021-10-15 20:27:48,592 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-15 20:27:48,593 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [291582909] [2021-10-15 20:27:48,593 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-15 20:27:48,593 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-15 20:27:48,616 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-15 20:27:48,814 INFO L134 CoverageAnalysis]: Checked inductivity of 594 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 338 trivial. 0 not checked. [2021-10-15 20:27:48,814 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-15 20:27:48,814 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [291582909] [2021-10-15 20:27:48,814 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [291582909] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-15 20:27:48,815 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1021305619] [2021-10-15 20:27:48,815 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-10-15 20:27:48,815 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-15 20:27:48,815 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/z3 [2021-10-15 20:27:48,816 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-15 20:27:48,836 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2021-10-15 20:27:49,183 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-10-15 20:27:49,183 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-15 20:27:49,185 INFO L263 TraceCheckSpWp]: Trace formula consists of 265 conjuncts, 18 conjunts are in the unsatisfiable core [2021-10-15 20:27:49,187 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-15 20:27:49,440 INFO L134 CoverageAnalysis]: Checked inductivity of 594 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 338 trivial. 0 not checked. [2021-10-15 20:27:49,440 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1021305619] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-15 20:27:49,440 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-10-15 20:27:49,440 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19] total 20 [2021-10-15 20:27:49,440 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2007612501] [2021-10-15 20:27:49,441 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2021-10-15 20:27:49,441 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-15 20:27:49,441 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-10-15 20:27:49,442 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=190, Invalid=190, Unknown=0, NotChecked=0, Total=380 [2021-10-15 20:27:49,444 INFO L499 CegarLoopForPetriNet]: Number of universal loopers: 13 out of 26 [2021-10-15 20:27:49,444 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 250 places, 237 transitions, 2183 flow. Second operand has 20 states, 20 states have (on average 15.1) internal successors, (302), 20 states have internal predecessors, (302), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-15 20:27:49,444 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-10-15 20:27:49,444 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 13 of 26 [2021-10-15 20:27:49,444 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-10-15 20:27:49,676 INFO L129 PetriNetUnfolder]: 69/363 cut-off events. [2021-10-15 20:27:49,676 INFO L130 PetriNetUnfolder]: For 5689/5689 co-relation queries the response was YES. [2021-10-15 20:27:49,680 INFO L84 FinitePrefix]: Finished finitePrefix Result has 2151 conditions, 363 events. 69/363 cut-off events. For 5689/5689 co-relation queries the response was YES. Maximal size of possible extension queue 8. Compared 875 event pairs, 0 based on Foata normal form. 5/368 useless extension candidates. Maximal degree in co-relation 2081. Up to 126 conditions per place. [2021-10-15 20:27:49,683 INFO L132 encePairwiseOnDemand]: 20/26 looper letters, 148 selfloop transitions, 68 changer transitions 0/294 dead transitions. [2021-10-15 20:27:49,683 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 268 places, 294 transitions, 3298 flow [2021-10-15 20:27:49,684 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-10-15 20:27:49,684 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2021-10-15 20:27:49,685 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 340 transitions. [2021-10-15 20:27:49,686 INFO L544 CegarLoopForPetriNet]: DFA transition density 0.6882591093117408 [2021-10-15 20:27:49,686 INFO L72 ComplementDD]: Start complementDD. Operand 19 states and 340 transitions. [2021-10-15 20:27:49,686 INFO L73 IsDeterministic]: Start isDeterministic. Operand 19 states and 340 transitions. [2021-10-15 20:27:49,686 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-10-15 20:27:49,686 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 19 states and 340 transitions. [2021-10-15 20:27:49,687 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 20 states, 19 states have (on average 17.894736842105264) internal successors, (340), 19 states have internal predecessors, (340), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-15 20:27:49,689 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 20 states, 20 states have (on average 26.0) internal successors, (520), 20 states have internal predecessors, (520), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-15 20:27:49,689 INFO L81 ComplementDD]: Finished complementDD. Result has 20 states, 20 states have (on average 26.0) internal successors, (520), 20 states have internal predecessors, (520), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-15 20:27:49,689 INFO L186 Difference]: Start difference. First operand has 250 places, 237 transitions, 2183 flow. Second operand 19 states and 340 transitions. [2021-10-15 20:27:49,689 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 268 places, 294 transitions, 3298 flow [2021-10-15 20:27:49,749 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 232 places, 294 transitions, 2750 flow, removed 183 selfloop flow, removed 36 redundant places. [2021-10-15 20:27:49,755 INFO L242 Difference]: Finished difference. Result has 233 places, 239 transitions, 1877 flow [2021-10-15 20:27:49,756 INFO L317 CegarLoopForPetriNet]: {PETRI_ALPHABET=26, PETRI_DIFFERENCE_MINUEND_FLOW=1651, PETRI_DIFFERENCE_MINUEND_PLACES=214, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=237, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=66, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=169, PETRI_DIFFERENCE_SUBTRAHEND_STATES=19, PETRI_FLOW=1877, PETRI_PLACES=233, PETRI_TRANSITIONS=239} [2021-10-15 20:27:49,756 INFO L334 CegarLoopForPetriNet]: 15 programPoint places, 218 predicate places. [2021-10-15 20:27:49,756 INFO L470 AbstractCegarLoop]: Abstraction has has 233 places, 239 transitions, 1877 flow [2021-10-15 20:27:49,756 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 15.1) internal successors, (302), 20 states have internal predecessors, (302), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-15 20:27:49,757 INFO L246 CegarLoopForPetriNet]: Found error trace [2021-10-15 20:27:49,757 INFO L254 CegarLoopForPetriNet]: trace histogram [17, 17, 16, 16, 10, 6, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-15 20:27:49,796 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2021-10-15 20:27:49,976 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-15 20:27:49,977 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-15 20:27:49,977 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-15 20:27:49,977 INFO L82 PathProgramCache]: Analyzing trace with hash -51082273, now seen corresponding path program 11 times [2021-10-15 20:27:49,977 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-15 20:27:49,977 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [567039585] [2021-10-15 20:27:49,977 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-15 20:27:49,977 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-15 20:27:50,000 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-15 20:27:50,200 INFO L134 CoverageAnalysis]: Checked inductivity of 673 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 384 trivial. 0 not checked. [2021-10-15 20:27:50,200 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-15 20:27:50,200 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [567039585] [2021-10-15 20:27:50,200 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [567039585] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-15 20:27:50,200 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [932967511] [2021-10-15 20:27:50,201 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-10-15 20:27:50,201 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-15 20:27:50,201 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/z3 [2021-10-15 20:27:50,202 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-15 20:27:50,231 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2021-10-15 20:27:50,761 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 18 check-sat command(s) [2021-10-15 20:27:50,761 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-15 20:27:50,764 INFO L263 TraceCheckSpWp]: Trace formula consists of 293 conjuncts, 19 conjunts are in the unsatisfiable core [2021-10-15 20:27:50,766 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-15 20:27:51,041 INFO L134 CoverageAnalysis]: Checked inductivity of 673 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 384 trivial. 0 not checked. [2021-10-15 20:27:51,041 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [932967511] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-15 20:27:51,042 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-10-15 20:27:51,042 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20] total 21 [2021-10-15 20:27:51,042 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1883440491] [2021-10-15 20:27:51,042 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2021-10-15 20:27:51,042 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-15 20:27:51,043 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-10-15 20:27:51,043 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=210, Invalid=210, Unknown=0, NotChecked=0, Total=420 [2021-10-15 20:27:51,044 INFO L499 CegarLoopForPetriNet]: Number of universal loopers: 13 out of 26 [2021-10-15 20:27:51,044 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 233 places, 239 transitions, 1877 flow. Second operand has 21 states, 21 states have (on average 15.095238095238095) internal successors, (317), 21 states have internal predecessors, (317), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-15 20:27:51,044 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-10-15 20:27:51,044 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 13 of 26 [2021-10-15 20:27:51,044 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-10-15 20:27:51,314 INFO L129 PetriNetUnfolder]: 73/381 cut-off events. [2021-10-15 20:27:51,314 INFO L130 PetriNetUnfolder]: For 5994/5994 co-relation queries the response was YES. [2021-10-15 20:27:51,318 INFO L84 FinitePrefix]: Finished finitePrefix Result has 2121 conditions, 381 events. 73/381 cut-off events. For 5994/5994 co-relation queries the response was YES. Maximal size of possible extension queue 8. Compared 923 event pairs, 0 based on Foata normal form. 5/386 useless extension candidates. Maximal degree in co-relation 2052. Up to 134 conditions per place. [2021-10-15 20:27:51,321 INFO L132 encePairwiseOnDemand]: 20/26 looper letters, 157 selfloop transitions, 70 changer transitions 0/305 dead transitions. [2021-10-15 20:27:51,321 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 252 places, 305 transitions, 3081 flow [2021-10-15 20:27:51,322 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-10-15 20:27:51,322 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2021-10-15 20:27:51,323 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 358 transitions. [2021-10-15 20:27:51,323 INFO L544 CegarLoopForPetriNet]: DFA transition density 0.6884615384615385 [2021-10-15 20:27:51,323 INFO L72 ComplementDD]: Start complementDD. Operand 20 states and 358 transitions. [2021-10-15 20:27:51,323 INFO L73 IsDeterministic]: Start isDeterministic. Operand 20 states and 358 transitions. [2021-10-15 20:27:51,324 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-10-15 20:27:51,324 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 20 states and 358 transitions. [2021-10-15 20:27:51,330 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 21 states, 20 states have (on average 17.9) internal successors, (358), 20 states have internal predecessors, (358), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-15 20:27:51,332 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 21 states, 21 states have (on average 26.0) internal successors, (546), 21 states have internal predecessors, (546), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-15 20:27:51,332 INFO L81 ComplementDD]: Finished complementDD. Result has 21 states, 21 states have (on average 26.0) internal successors, (546), 21 states have internal predecessors, (546), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-15 20:27:51,332 INFO L186 Difference]: Start difference. First operand has 233 places, 239 transitions, 1877 flow. Second operand 20 states and 358 transitions. [2021-10-15 20:27:51,332 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 252 places, 305 transitions, 3081 flow [2021-10-15 20:27:51,390 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 235 places, 305 transitions, 2881 flow, removed 35 selfloop flow, removed 17 redundant places. [2021-10-15 20:27:51,398 INFO L242 Difference]: Finished difference. Result has 236 places, 241 transitions, 1909 flow [2021-10-15 20:27:51,398 INFO L317 CegarLoopForPetriNet]: {PETRI_ALPHABET=26, PETRI_DIFFERENCE_MINUEND_FLOW=1677, PETRI_DIFFERENCE_MINUEND_PLACES=216, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=239, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=68, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=169, PETRI_DIFFERENCE_SUBTRAHEND_STATES=20, PETRI_FLOW=1909, PETRI_PLACES=236, PETRI_TRANSITIONS=241} [2021-10-15 20:27:51,399 INFO L334 CegarLoopForPetriNet]: 15 programPoint places, 221 predicate places. [2021-10-15 20:27:51,399 INFO L470 AbstractCegarLoop]: Abstraction has has 236 places, 241 transitions, 1909 flow [2021-10-15 20:27:51,399 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 21 states have (on average 15.095238095238095) internal successors, (317), 21 states have internal predecessors, (317), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-15 20:27:51,399 INFO L246 CegarLoopForPetriNet]: Found error trace [2021-10-15 20:27:51,399 INFO L254 CegarLoopForPetriNet]: trace histogram [18, 18, 17, 17, 15, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-15 20:27:51,434 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2021-10-15 20:27:51,615 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-15 20:27:51,615 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-15 20:27:51,615 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-15 20:27:51,615 INFO L82 PathProgramCache]: Analyzing trace with hash 1031632161, now seen corresponding path program 12 times [2021-10-15 20:27:51,615 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-15 20:27:51,615 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1290698415] [2021-10-15 20:27:51,616 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-15 20:27:51,616 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-15 20:27:51,659 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-15 20:27:51,894 INFO L134 CoverageAnalysis]: Checked inductivity of 757 backedges. 0 proven. 324 refuted. 0 times theorem prover too weak. 433 trivial. 0 not checked. [2021-10-15 20:27:51,894 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-15 20:27:51,894 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1290698415] [2021-10-15 20:27:51,894 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1290698415] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-15 20:27:51,895 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1854755514] [2021-10-15 20:27:51,895 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-10-15 20:27:51,895 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-15 20:27:51,895 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/z3 [2021-10-15 20:27:51,896 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-15 20:27:51,916 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2021-10-15 20:27:52,411 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 11 check-sat command(s) [2021-10-15 20:27:52,411 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-15 20:27:52,413 INFO L263 TraceCheckSpWp]: Trace formula consists of 191 conjuncts, 23 conjunts are in the unsatisfiable core [2021-10-15 20:27:52,415 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-15 20:27:53,046 INFO L354 Elim1Store]: treesize reduction 11, result has 8.3 percent of original size [2021-10-15 20:27:53,047 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 52 treesize of output 28 [2021-10-15 20:27:53,079 INFO L134 CoverageAnalysis]: Checked inductivity of 757 backedges. 0 proven. 88 refuted. 0 times theorem prover too weak. 669 trivial. 0 not checked. [2021-10-15 20:27:53,079 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1854755514] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-15 20:27:53,080 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-10-15 20:27:53,080 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 13] total 32 [2021-10-15 20:27:53,080 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [500106409] [2021-10-15 20:27:53,081 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2021-10-15 20:27:53,081 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-15 20:27:53,081 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-10-15 20:27:53,089 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=293, Invalid=699, Unknown=0, NotChecked=0, Total=992 [2021-10-15 20:27:53,089 INFO L499 CegarLoopForPetriNet]: Number of universal loopers: 4 out of 26 [2021-10-15 20:27:53,091 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 236 places, 241 transitions, 1909 flow. Second operand has 32 states, 32 states have (on average 6.3125) internal successors, (202), 32 states have internal predecessors, (202), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-15 20:27:53,091 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-10-15 20:27:53,091 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 4 of 26 [2021-10-15 20:27:53,091 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-10-15 20:27:54,058 INFO L129 PetriNetUnfolder]: 94/489 cut-off events. [2021-10-15 20:27:54,058 INFO L130 PetriNetUnfolder]: For 7041/7041 co-relation queries the response was YES. [2021-10-15 20:27:54,063 INFO L84 FinitePrefix]: Finished finitePrefix Result has 2840 conditions, 489 events. 94/489 cut-off events. For 7041/7041 co-relation queries the response was YES. Maximal size of possible extension queue 10. Compared 1400 event pairs, 0 based on Foata normal form. 8/454 useless extension candidates. Maximal degree in co-relation 2770. Up to 174 conditions per place. [2021-10-15 20:27:54,067 INFO L132 encePairwiseOnDemand]: 12/26 looper letters, 314 selfloop transitions, 103 changer transitions 0/419 dead transitions. [2021-10-15 20:27:54,067 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 283 places, 419 transitions, 4398 flow [2021-10-15 20:27:54,068 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2021-10-15 20:27:54,068 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2021-10-15 20:27:54,069 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 411 transitions. [2021-10-15 20:27:54,070 INFO L544 CegarLoopForPetriNet]: DFA transition density 0.3293269230769231 [2021-10-15 20:27:54,070 INFO L72 ComplementDD]: Start complementDD. Operand 48 states and 411 transitions. [2021-10-15 20:27:54,070 INFO L73 IsDeterministic]: Start isDeterministic. Operand 48 states and 411 transitions. [2021-10-15 20:27:54,070 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-10-15 20:27:54,070 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 48 states and 411 transitions. [2021-10-15 20:27:54,071 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 49 states, 48 states have (on average 8.5625) internal successors, (411), 48 states have internal predecessors, (411), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-15 20:27:54,074 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 49 states, 49 states have (on average 26.0) internal successors, (1274), 49 states have internal predecessors, (1274), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-15 20:27:54,075 INFO L81 ComplementDD]: Finished complementDD. Result has 49 states, 49 states have (on average 26.0) internal successors, (1274), 49 states have internal predecessors, (1274), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-15 20:27:54,075 INFO L186 Difference]: Start difference. First operand has 236 places, 241 transitions, 1909 flow. Second operand 48 states and 411 transitions. [2021-10-15 20:27:54,075 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 283 places, 419 transitions, 4398 flow [2021-10-15 20:27:54,145 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 265 places, 419 transitions, 4120 flow, removed 57 selfloop flow, removed 18 redundant places. [2021-10-15 20:27:54,152 INFO L242 Difference]: Finished difference. Result has 274 places, 266 transitions, 2262 flow [2021-10-15 20:27:54,153 INFO L317 CegarLoopForPetriNet]: {PETRI_ALPHABET=26, PETRI_DIFFERENCE_MINUEND_FLOW=1699, PETRI_DIFFERENCE_MINUEND_PLACES=218, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=241, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=78, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=154, PETRI_DIFFERENCE_SUBTRAHEND_STATES=48, PETRI_FLOW=2262, PETRI_PLACES=274, PETRI_TRANSITIONS=266} [2021-10-15 20:27:54,153 INFO L334 CegarLoopForPetriNet]: 15 programPoint places, 259 predicate places. [2021-10-15 20:27:54,154 INFO L470 AbstractCegarLoop]: Abstraction has has 274 places, 266 transitions, 2262 flow [2021-10-15 20:27:54,154 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 6.3125) internal successors, (202), 32 states have internal predecessors, (202), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-15 20:27:54,154 INFO L246 CegarLoopForPetriNet]: Found error trace [2021-10-15 20:27:54,154 INFO L254 CegarLoopForPetriNet]: trace histogram [19, 19, 18, 18, 12, 6, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-15 20:27:54,192 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2021-10-15 20:27:54,374 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2021-10-15 20:27:54,374 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-15 20:27:54,374 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-15 20:27:54,374 INFO L82 PathProgramCache]: Analyzing trace with hash 1811016031, now seen corresponding path program 13 times [2021-10-15 20:27:54,374 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-15 20:27:54,375 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1957327851] [2021-10-15 20:27:54,375 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-15 20:27:54,375 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-15 20:27:54,401 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-15 20:27:54,644 INFO L134 CoverageAnalysis]: Checked inductivity of 846 backedges. 0 proven. 361 refuted. 0 times theorem prover too weak. 485 trivial. 0 not checked. [2021-10-15 20:27:54,645 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-15 20:27:54,645 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1957327851] [2021-10-15 20:27:54,645 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1957327851] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-15 20:27:54,645 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1394350260] [2021-10-15 20:27:54,645 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-10-15 20:27:54,645 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-15 20:27:54,645 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/z3 [2021-10-15 20:27:54,646 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-15 20:27:54,663 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2021-10-15 20:27:55,143 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-15 20:27:55,145 INFO L263 TraceCheckSpWp]: Trace formula consists of 321 conjuncts, 21 conjunts are in the unsatisfiable core [2021-10-15 20:27:55,147 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-15 20:27:55,451 INFO L134 CoverageAnalysis]: Checked inductivity of 846 backedges. 0 proven. 361 refuted. 0 times theorem prover too weak. 485 trivial. 0 not checked. [2021-10-15 20:27:55,451 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1394350260] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-15 20:27:55,451 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-10-15 20:27:55,451 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22] total 23 [2021-10-15 20:27:55,452 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1593849966] [2021-10-15 20:27:55,452 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2021-10-15 20:27:55,452 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-15 20:27:55,453 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-10-15 20:27:55,453 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=253, Invalid=253, Unknown=0, NotChecked=0, Total=506 [2021-10-15 20:27:55,453 INFO L499 CegarLoopForPetriNet]: Number of universal loopers: 13 out of 26 [2021-10-15 20:27:55,454 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 274 places, 266 transitions, 2262 flow. Second operand has 23 states, 23 states have (on average 15.08695652173913) internal successors, (347), 23 states have internal predecessors, (347), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-15 20:27:55,454 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-10-15 20:27:55,454 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 13 of 26 [2021-10-15 20:27:55,454 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-10-15 20:27:55,777 INFO L129 PetriNetUnfolder]: 99/511 cut-off events. [2021-10-15 20:27:55,778 INFO L130 PetriNetUnfolder]: For 8620/8620 co-relation queries the response was YES. [2021-10-15 20:27:55,783 INFO L84 FinitePrefix]: Finished finitePrefix Result has 2905 conditions, 511 events. 99/511 cut-off events. For 8620/8620 co-relation queries the response was YES. Maximal size of possible extension queue 10. Compared 1461 event pairs, 0 based on Foata normal form. 6/517 useless extension candidates. Maximal degree in co-relation 2826. Up to 184 conditions per place. [2021-10-15 20:27:55,787 INFO L132 encePairwiseOnDemand]: 20/26 looper letters, 175 selfloop transitions, 90 changer transitions 0/350 dead transitions. [2021-10-15 20:27:55,788 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 295 places, 350 transitions, 3710 flow [2021-10-15 20:27:55,788 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-10-15 20:27:55,788 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2021-10-15 20:27:55,789 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 394 transitions. [2021-10-15 20:27:55,789 INFO L544 CegarLoopForPetriNet]: DFA transition density 0.6888111888111889 [2021-10-15 20:27:55,790 INFO L72 ComplementDD]: Start complementDD. Operand 22 states and 394 transitions. [2021-10-15 20:27:55,790 INFO L73 IsDeterministic]: Start isDeterministic. Operand 22 states and 394 transitions. [2021-10-15 20:27:55,790 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-10-15 20:27:55,790 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 22 states and 394 transitions. [2021-10-15 20:27:55,791 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 23 states, 22 states have (on average 17.90909090909091) internal successors, (394), 22 states have internal predecessors, (394), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-15 20:27:55,793 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 23 states, 23 states have (on average 26.0) internal successors, (598), 23 states have internal predecessors, (598), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-15 20:27:55,793 INFO L81 ComplementDD]: Finished complementDD. Result has 23 states, 23 states have (on average 26.0) internal successors, (598), 23 states have internal predecessors, (598), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-15 20:27:55,793 INFO L186 Difference]: Start difference. First operand has 274 places, 266 transitions, 2262 flow. Second operand 22 states and 394 transitions. [2021-10-15 20:27:55,793 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 295 places, 350 transitions, 3710 flow [2021-10-15 20:27:55,891 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 286 places, 350 transitions, 3517 flow, removed 76 selfloop flow, removed 9 redundant places. [2021-10-15 20:27:55,898 INFO L242 Difference]: Finished difference. Result has 287 places, 268 transitions, 2352 flow [2021-10-15 20:27:55,898 INFO L317 CegarLoopForPetriNet]: {PETRI_ALPHABET=26, PETRI_DIFFERENCE_MINUEND_FLOW=2069, PETRI_DIFFERENCE_MINUEND_PLACES=265, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=266, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=88, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=176, PETRI_DIFFERENCE_SUBTRAHEND_STATES=22, PETRI_FLOW=2352, PETRI_PLACES=287, PETRI_TRANSITIONS=268} [2021-10-15 20:27:55,899 INFO L334 CegarLoopForPetriNet]: 15 programPoint places, 272 predicate places. [2021-10-15 20:27:55,899 INFO L470 AbstractCegarLoop]: Abstraction has has 287 places, 268 transitions, 2352 flow [2021-10-15 20:27:55,899 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 15.08695652173913) internal successors, (347), 23 states have internal predecessors, (347), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-15 20:27:55,899 INFO L246 CegarLoopForPetriNet]: Found error trace [2021-10-15 20:27:55,900 INFO L254 CegarLoopForPetriNet]: trace histogram [20, 20, 19, 19, 10, 9, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-15 20:27:55,935 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2021-10-15 20:27:56,118 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2021-10-15 20:27:56,118 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-15 20:27:56,118 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-15 20:27:56,118 INFO L82 PathProgramCache]: Analyzing trace with hash -2126850651, now seen corresponding path program 14 times [2021-10-15 20:27:56,118 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-15 20:27:56,119 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [237397033] [2021-10-15 20:27:56,119 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-15 20:27:56,119 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-15 20:27:56,144 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-15 20:27:56,377 INFO L134 CoverageAnalysis]: Checked inductivity of 940 backedges. 0 proven. 400 refuted. 0 times theorem prover too weak. 540 trivial. 0 not checked. [2021-10-15 20:27:56,378 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-15 20:27:56,378 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [237397033] [2021-10-15 20:27:56,378 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [237397033] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-15 20:27:56,378 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [884514489] [2021-10-15 20:27:56,378 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-10-15 20:27:56,378 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-15 20:27:56,378 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/z3 [2021-10-15 20:27:56,379 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-15 20:27:56,380 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2021-10-15 20:27:56,821 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-10-15 20:27:56,821 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-15 20:27:56,823 INFO L263 TraceCheckSpWp]: Trace formula consists of 329 conjuncts, 22 conjunts are in the unsatisfiable core [2021-10-15 20:27:56,825 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-15 20:27:57,071 INFO L134 CoverageAnalysis]: Checked inductivity of 940 backedges. 0 proven. 400 refuted. 0 times theorem prover too weak. 540 trivial. 0 not checked. [2021-10-15 20:27:57,072 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [884514489] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-15 20:27:57,072 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-10-15 20:27:57,072 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23] total 24 [2021-10-15 20:27:57,072 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1039287471] [2021-10-15 20:27:57,073 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2021-10-15 20:27:57,073 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-15 20:27:57,074 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-10-15 20:27:57,074 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=276, Invalid=276, Unknown=0, NotChecked=0, Total=552 [2021-10-15 20:27:57,075 INFO L499 CegarLoopForPetriNet]: Number of universal loopers: 13 out of 26 [2021-10-15 20:27:57,076 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 287 places, 268 transitions, 2352 flow. Second operand has 24 states, 24 states have (on average 15.083333333333334) internal successors, (362), 24 states have internal predecessors, (362), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-15 20:27:57,076 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-10-15 20:27:57,076 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 13 of 26 [2021-10-15 20:27:57,076 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-10-15 20:27:57,375 INFO L129 PetriNetUnfolder]: 104/533 cut-off events. [2021-10-15 20:27:57,375 INFO L130 PetriNetUnfolder]: For 9529/9529 co-relation queries the response was YES. [2021-10-15 20:27:57,379 INFO L84 FinitePrefix]: Finished finitePrefix Result has 3085 conditions, 533 events. 104/533 cut-off events. For 9529/9529 co-relation queries the response was YES. Maximal size of possible extension queue 10. Compared 1531 event pairs, 0 based on Foata normal form. 6/539 useless extension candidates. Maximal degree in co-relation 3005. Up to 194 conditions per place. [2021-10-15 20:27:57,383 INFO L132 encePairwiseOnDemand]: 20/26 looper letters, 184 selfloop transitions, 92 changer transitions 0/361 dead transitions. [2021-10-15 20:27:57,383 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 309 places, 361 transitions, 3905 flow [2021-10-15 20:27:57,384 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-10-15 20:27:57,384 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2021-10-15 20:27:57,384 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 412 transitions. [2021-10-15 20:27:57,385 INFO L544 CegarLoopForPetriNet]: DFA transition density 0.6889632107023411 [2021-10-15 20:27:57,385 INFO L72 ComplementDD]: Start complementDD. Operand 23 states and 412 transitions. [2021-10-15 20:27:57,385 INFO L73 IsDeterministic]: Start isDeterministic. Operand 23 states and 412 transitions. [2021-10-15 20:27:57,385 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-10-15 20:27:57,385 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 23 states and 412 transitions. [2021-10-15 20:27:57,386 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 24 states, 23 states have (on average 17.91304347826087) internal successors, (412), 23 states have internal predecessors, (412), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-15 20:27:57,387 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 24 states, 24 states have (on average 26.0) internal successors, (624), 24 states have internal predecessors, (624), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-15 20:27:57,388 INFO L81 ComplementDD]: Finished complementDD. Result has 24 states, 24 states have (on average 26.0) internal successors, (624), 24 states have internal predecessors, (624), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-15 20:27:57,388 INFO L186 Difference]: Start difference. First operand has 287 places, 268 transitions, 2352 flow. Second operand 23 states and 412 transitions. [2021-10-15 20:27:57,388 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 309 places, 361 transitions, 3905 flow [2021-10-15 20:27:57,480 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 289 places, 361 transitions, 3646 flow, removed 42 selfloop flow, removed 20 redundant places. [2021-10-15 20:27:57,492 INFO L242 Difference]: Finished difference. Result has 290 places, 270 transitions, 2383 flow [2021-10-15 20:27:57,492 INFO L317 CegarLoopForPetriNet]: {PETRI_ALPHABET=26, PETRI_DIFFERENCE_MINUEND_FLOW=2093, PETRI_DIFFERENCE_MINUEND_PLACES=267, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=268, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=90, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=176, PETRI_DIFFERENCE_SUBTRAHEND_STATES=23, PETRI_FLOW=2383, PETRI_PLACES=290, PETRI_TRANSITIONS=270} [2021-10-15 20:27:57,493 INFO L334 CegarLoopForPetriNet]: 15 programPoint places, 275 predicate places. [2021-10-15 20:27:57,493 INFO L470 AbstractCegarLoop]: Abstraction has has 290 places, 270 transitions, 2383 flow [2021-10-15 20:27:57,493 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 15.083333333333334) internal successors, (362), 24 states have internal predecessors, (362), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-15 20:27:57,493 INFO L246 CegarLoopForPetriNet]: Found error trace [2021-10-15 20:27:57,494 INFO L254 CegarLoopForPetriNet]: trace histogram [21, 21, 20, 20, 18, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-15 20:27:57,535 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2021-10-15 20:27:57,712 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23,23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-15 20:27:57,712 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-15 20:27:57,712 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-15 20:27:57,712 INFO L82 PathProgramCache]: Analyzing trace with hash 1846067415, now seen corresponding path program 15 times [2021-10-15 20:27:57,712 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-15 20:27:57,712 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1717460778] [2021-10-15 20:27:57,712 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-15 20:27:57,713 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-15 20:27:57,737 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-15 20:27:58,000 INFO L134 CoverageAnalysis]: Checked inductivity of 1039 backedges. 0 proven. 441 refuted. 0 times theorem prover too weak. 598 trivial. 0 not checked. [2021-10-15 20:27:58,001 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-15 20:27:58,001 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1717460778] [2021-10-15 20:27:58,001 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1717460778] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-15 20:27:58,001 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1330895505] [2021-10-15 20:27:58,001 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-10-15 20:27:58,002 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-15 20:27:58,002 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/z3 [2021-10-15 20:27:58,004 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-15 20:27:58,025 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2021-10-15 20:27:58,572 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2021-10-15 20:27:58,572 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-15 20:27:58,573 INFO L263 TraceCheckSpWp]: Trace formula consists of 139 conjuncts, 15 conjunts are in the unsatisfiable core [2021-10-15 20:27:58,575 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-15 20:27:59,032 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 37 treesize of output 25 [2021-10-15 20:27:59,065 INFO L134 CoverageAnalysis]: Checked inductivity of 1039 backedges. 0 proven. 103 refuted. 0 times theorem prover too weak. 936 trivial. 0 not checked. [2021-10-15 20:27:59,066 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1330895505] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-15 20:27:59,066 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-10-15 20:27:59,066 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 9] total 31 [2021-10-15 20:27:59,066 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1668216979] [2021-10-15 20:27:59,067 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2021-10-15 20:27:59,067 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-15 20:27:59,067 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-10-15 20:27:59,068 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=334, Invalid=596, Unknown=0, NotChecked=0, Total=930 [2021-10-15 20:27:59,068 INFO L499 CegarLoopForPetriNet]: Number of universal loopers: 4 out of 26 [2021-10-15 20:27:59,069 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 290 places, 270 transitions, 2383 flow. Second operand has 31 states, 31 states have (on average 6.548387096774194) internal successors, (203), 31 states have internal predecessors, (203), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-15 20:27:59,069 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-10-15 20:27:59,069 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 4 of 26 [2021-10-15 20:27:59,069 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-10-15 20:28:00,035 INFO L129 PetriNetUnfolder]: 149/751 cut-off events. [2021-10-15 20:28:00,035 INFO L130 PetriNetUnfolder]: For 14916/14916 co-relation queries the response was YES. [2021-10-15 20:28:00,043 INFO L84 FinitePrefix]: Finished finitePrefix Result has 4792 conditions, 751 events. 149/751 cut-off events. For 14916/14916 co-relation queries the response was YES. Maximal size of possible extension queue 14. Compared 2717 event pairs, 0 based on Foata normal form. 10/693 useless extension candidates. Maximal degree in co-relation 4711. Up to 280 conditions per place. [2021-10-15 20:28:00,050 INFO L132 encePairwiseOnDemand]: 15/26 looper letters, 396 selfloop transitions, 178 changer transitions 0/576 dead transitions. [2021-10-15 20:28:00,050 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 339 places, 576 transitions, 6773 flow [2021-10-15 20:28:00,051 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2021-10-15 20:28:00,051 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2021-10-15 20:28:00,054 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 445 transitions. [2021-10-15 20:28:00,054 INFO L544 CegarLoopForPetriNet]: DFA transition density 0.3423076923076923 [2021-10-15 20:28:00,055 INFO L72 ComplementDD]: Start complementDD. Operand 50 states and 445 transitions. [2021-10-15 20:28:00,055 INFO L73 IsDeterministic]: Start isDeterministic. Operand 50 states and 445 transitions. [2021-10-15 20:28:00,056 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-10-15 20:28:00,057 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 50 states and 445 transitions. [2021-10-15 20:28:00,058 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 51 states, 50 states have (on average 8.9) internal successors, (445), 50 states have internal predecessors, (445), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-15 20:28:00,060 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 51 states, 51 states have (on average 26.0) internal successors, (1326), 51 states have internal predecessors, (1326), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-15 20:28:00,061 INFO L81 ComplementDD]: Finished complementDD. Result has 51 states, 51 states have (on average 26.0) internal successors, (1326), 51 states have internal predecessors, (1326), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-15 20:28:00,061 INFO L186 Difference]: Start difference. First operand has 290 places, 270 transitions, 2383 flow. Second operand 50 states and 445 transitions. [2021-10-15 20:28:00,061 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 339 places, 576 transitions, 6773 flow [2021-10-15 20:28:00,221 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 318 places, 576 transitions, 6397 flow, removed 68 selfloop flow, removed 21 redundant places. [2021-10-15 20:28:00,233 INFO L242 Difference]: Finished difference. Result has 343 places, 352 transitions, 4066 flow [2021-10-15 20:28:00,234 INFO L317 CegarLoopForPetriNet]: {PETRI_ALPHABET=26, PETRI_DIFFERENCE_MINUEND_FLOW=2115, PETRI_DIFFERENCE_MINUEND_PLACES=269, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=270, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=96, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=146, PETRI_DIFFERENCE_SUBTRAHEND_STATES=50, PETRI_FLOW=4066, PETRI_PLACES=343, PETRI_TRANSITIONS=352} [2021-10-15 20:28:00,234 INFO L334 CegarLoopForPetriNet]: 15 programPoint places, 328 predicate places. [2021-10-15 20:28:00,235 INFO L470 AbstractCegarLoop]: Abstraction has has 343 places, 352 transitions, 4066 flow [2021-10-15 20:28:00,235 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 31 states have (on average 6.548387096774194) internal successors, (203), 31 states have internal predecessors, (203), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-15 20:28:00,235 INFO L246 CegarLoopForPetriNet]: Found error trace [2021-10-15 20:28:00,235 INFO L254 CegarLoopForPetriNet]: trace histogram [22, 22, 21, 21, 12, 9, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-15 20:28:00,275 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Forceful destruction successful, exit code 0 [2021-10-15 20:28:00,450 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24,24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-15 20:28:00,450 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-15 20:28:00,450 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-15 20:28:00,451 INFO L82 PathProgramCache]: Analyzing trace with hash -2055522139, now seen corresponding path program 16 times [2021-10-15 20:28:00,451 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-15 20:28:00,451 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1818746975] [2021-10-15 20:28:00,451 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-15 20:28:00,451 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-15 20:28:00,485 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-15 20:28:00,776 INFO L134 CoverageAnalysis]: Checked inductivity of 1143 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 659 trivial. 0 not checked. [2021-10-15 20:28:00,776 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-15 20:28:00,776 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1818746975] [2021-10-15 20:28:00,776 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1818746975] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-15 20:28:00,776 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1273337080] [2021-10-15 20:28:00,776 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-10-15 20:28:00,777 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-15 20:28:00,777 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/z3 [2021-10-15 20:28:00,778 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-15 20:28:00,779 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2021-10-15 20:28:01,258 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-10-15 20:28:01,258 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-15 20:28:01,260 INFO L263 TraceCheckSpWp]: Trace formula consists of 357 conjuncts, 24 conjunts are in the unsatisfiable core [2021-10-15 20:28:01,262 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-15 20:28:01,605 INFO L134 CoverageAnalysis]: Checked inductivity of 1143 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 659 trivial. 0 not checked. [2021-10-15 20:28:01,606 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1273337080] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-15 20:28:01,606 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-10-15 20:28:01,606 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25] total 26 [2021-10-15 20:28:01,606 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1284573332] [2021-10-15 20:28:01,607 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2021-10-15 20:28:01,607 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-15 20:28:01,610 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-10-15 20:28:01,610 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=325, Invalid=325, Unknown=0, NotChecked=0, Total=650 [2021-10-15 20:28:01,611 INFO L499 CegarLoopForPetriNet]: Number of universal loopers: 13 out of 26 [2021-10-15 20:28:01,611 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 343 places, 352 transitions, 4066 flow. Second operand has 26 states, 26 states have (on average 15.076923076923077) internal successors, (392), 26 states have internal predecessors, (392), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-15 20:28:01,611 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-10-15 20:28:01,612 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 13 of 26 [2021-10-15 20:28:01,612 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-10-15 20:28:02,124 INFO L129 PetriNetUnfolder]: 156/781 cut-off events. [2021-10-15 20:28:02,124 INFO L130 PetriNetUnfolder]: For 26644/26644 co-relation queries the response was YES. [2021-10-15 20:28:02,133 INFO L84 FinitePrefix]: Finished finitePrefix Result has 5410 conditions, 781 events. 156/781 cut-off events. For 26644/26644 co-relation queries the response was YES. Maximal size of possible extension queue 14. Compared 2824 event pairs, 0 based on Foata normal form. 8/789 useless extension candidates. Maximal degree in co-relation 5304. Up to 294 conditions per place. [2021-10-15 20:28:02,141 INFO L132 encePairwiseOnDemand]: 20/26 looper letters, 242 selfloop transitions, 128 changer transitions 0/465 dead transitions. [2021-10-15 20:28:02,141 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 367 places, 465 transitions, 6704 flow [2021-10-15 20:28:02,142 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-10-15 20:28:02,142 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2021-10-15 20:28:02,143 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 448 transitions. [2021-10-15 20:28:02,143 INFO L544 CegarLoopForPetriNet]: DFA transition density 0.6892307692307692 [2021-10-15 20:28:02,143 INFO L72 ComplementDD]: Start complementDD. Operand 25 states and 448 transitions. [2021-10-15 20:28:02,143 INFO L73 IsDeterministic]: Start isDeterministic. Operand 25 states and 448 transitions. [2021-10-15 20:28:02,144 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-10-15 20:28:02,144 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 25 states and 448 transitions. [2021-10-15 20:28:02,145 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 26 states, 25 states have (on average 17.92) internal successors, (448), 25 states have internal predecessors, (448), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-15 20:28:02,146 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 26 states, 26 states have (on average 26.0) internal successors, (676), 26 states have internal predecessors, (676), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-15 20:28:02,147 INFO L81 ComplementDD]: Finished complementDD. Result has 26 states, 26 states have (on average 26.0) internal successors, (676), 26 states have internal predecessors, (676), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-15 20:28:02,147 INFO L186 Difference]: Start difference. First operand has 343 places, 352 transitions, 4066 flow. Second operand 25 states and 448 transitions. [2021-10-15 20:28:02,147 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 367 places, 465 transitions, 6704 flow [2021-10-15 20:28:02,301 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 359 places, 465 transitions, 5813 flow, removed 422 selfloop flow, removed 8 redundant places. [2021-10-15 20:28:02,308 INFO L242 Difference]: Finished difference. Result has 360 places, 354 transitions, 3584 flow [2021-10-15 20:28:02,309 INFO L317 CegarLoopForPetriNet]: {PETRI_ALPHABET=26, PETRI_DIFFERENCE_MINUEND_FLOW=3211, PETRI_DIFFERENCE_MINUEND_PLACES=335, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=352, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=126, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=224, PETRI_DIFFERENCE_SUBTRAHEND_STATES=25, PETRI_FLOW=3584, PETRI_PLACES=360, PETRI_TRANSITIONS=354} [2021-10-15 20:28:02,309 INFO L334 CegarLoopForPetriNet]: 15 programPoint places, 345 predicate places. [2021-10-15 20:28:02,309 INFO L470 AbstractCegarLoop]: Abstraction has has 360 places, 354 transitions, 3584 flow [2021-10-15 20:28:02,310 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 15.076923076923077) internal successors, (392), 26 states have internal predecessors, (392), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-15 20:28:02,310 INFO L246 CegarLoopForPetriNet]: Found error trace [2021-10-15 20:28:02,310 INFO L254 CegarLoopForPetriNet]: trace histogram [23, 23, 22, 22, 12, 10, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-15 20:28:02,344 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Ended with exit code 0 [2021-10-15 20:28:02,524 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2021-10-15 20:28:02,524 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-15 20:28:02,524 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-15 20:28:02,524 INFO L82 PathProgramCache]: Analyzing trace with hash -346393577, now seen corresponding path program 17 times [2021-10-15 20:28:02,524 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-15 20:28:02,525 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [998523317] [2021-10-15 20:28:02,525 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-15 20:28:02,525 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-15 20:28:02,551 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-15 20:28:02,813 INFO L134 CoverageAnalysis]: Checked inductivity of 1252 backedges. 0 proven. 529 refuted. 0 times theorem prover too weak. 723 trivial. 0 not checked. [2021-10-15 20:28:02,813 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-15 20:28:02,813 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [998523317] [2021-10-15 20:28:02,814 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [998523317] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-15 20:28:02,814 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [811810396] [2021-10-15 20:28:02,814 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-10-15 20:28:02,814 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-15 20:28:02,814 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/z3 [2021-10-15 20:28:02,814 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-15 20:28:02,815 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2021-10-15 20:28:04,588 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 24 check-sat command(s) [2021-10-15 20:28:04,588 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-15 20:28:04,594 INFO L263 TraceCheckSpWp]: Trace formula consists of 365 conjuncts, 24 conjunts are in the unsatisfiable core [2021-10-15 20:28:04,596 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-15 20:28:04,886 INFO L134 CoverageAnalysis]: Checked inductivity of 1252 backedges. 0 proven. 715 refuted. 0 times theorem prover too weak. 537 trivial. 0 not checked. [2021-10-15 20:28:04,887 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [811810396] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-15 20:28:04,887 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-10-15 20:28:04,887 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 25] total 26 [2021-10-15 20:28:04,887 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [361703388] [2021-10-15 20:28:04,887 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2021-10-15 20:28:04,887 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-15 20:28:04,888 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-10-15 20:28:04,888 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=325, Invalid=325, Unknown=0, NotChecked=0, Total=650 [2021-10-15 20:28:04,888 INFO L499 CegarLoopForPetriNet]: Number of universal loopers: 13 out of 26 [2021-10-15 20:28:04,889 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 360 places, 354 transitions, 3584 flow. Second operand has 26 states, 26 states have (on average 17.346153846153847) internal successors, (451), 26 states have internal predecessors, (451), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-15 20:28:04,889 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-10-15 20:28:04,889 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 13 of 26 [2021-10-15 20:28:04,889 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-10-15 20:28:05,361 INFO L129 PetriNetUnfolder]: 163/811 cut-off events. [2021-10-15 20:28:05,361 INFO L130 PetriNetUnfolder]: For 25189/25189 co-relation queries the response was YES. [2021-10-15 20:28:05,373 INFO L84 FinitePrefix]: Finished finitePrefix Result has 5370 conditions, 811 events. 163/811 cut-off events. For 25189/25189 co-relation queries the response was YES. Maximal size of possible extension queue 14. Compared 2940 event pairs, 0 based on Foata normal form. 8/819 useless extension candidates. Maximal degree in co-relation 5264. Up to 308 conditions per place. [2021-10-15 20:28:05,380 INFO L132 encePairwiseOnDemand]: 20/26 looper letters, 253 selfloop transitions, 130 changer transitions 0/478 dead transitions. [2021-10-15 20:28:05,381 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 385 places, 478 transitions, 6360 flow [2021-10-15 20:28:05,381 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-10-15 20:28:05,381 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2021-10-15 20:28:05,382 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 466 transitions. [2021-10-15 20:28:05,383 INFO L544 CegarLoopForPetriNet]: DFA transition density 0.6893491124260355 [2021-10-15 20:28:05,383 INFO L72 ComplementDD]: Start complementDD. Operand 26 states and 466 transitions. [2021-10-15 20:28:05,384 INFO L73 IsDeterministic]: Start isDeterministic. Operand 26 states and 466 transitions. [2021-10-15 20:28:05,384 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-10-15 20:28:05,384 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 26 states and 466 transitions. [2021-10-15 20:28:05,394 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 27 states, 26 states have (on average 17.923076923076923) internal successors, (466), 26 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) [2021-10-15 20:28:05,404 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 27 states, 27 states have (on average 26.0) internal successors, (702), 27 states have internal predecessors, (702), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-15 20:28:05,404 INFO L81 ComplementDD]: Finished complementDD. Result has 27 states, 27 states have (on average 26.0) internal successors, (702), 27 states have internal predecessors, (702), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-15 20:28:05,405 INFO L186 Difference]: Start difference. First operand has 360 places, 354 transitions, 3584 flow. Second operand 26 states and 466 transitions. [2021-10-15 20:28:05,405 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 385 places, 478 transitions, 6360 flow [2021-10-15 20:28:05,628 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 362 places, 478 transitions, 6013 flow, removed 48 selfloop flow, removed 23 redundant places. [2021-10-15 20:28:05,638 INFO L242 Difference]: Finished difference. Result has 363 places, 356 transitions, 3617 flow [2021-10-15 20:28:05,639 INFO L317 CegarLoopForPetriNet]: {PETRI_ALPHABET=26, PETRI_DIFFERENCE_MINUEND_FLOW=3237, PETRI_DIFFERENCE_MINUEND_PLACES=337, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=354, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=128, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=224, PETRI_DIFFERENCE_SUBTRAHEND_STATES=26, PETRI_FLOW=3617, PETRI_PLACES=363, PETRI_TRANSITIONS=356} [2021-10-15 20:28:05,640 INFO L334 CegarLoopForPetriNet]: 15 programPoint places, 348 predicate places. [2021-10-15 20:28:05,640 INFO L470 AbstractCegarLoop]: Abstraction has has 363 places, 356 transitions, 3617 flow [2021-10-15 20:28:05,641 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 17.346153846153847) internal successors, (451), 26 states have internal predecessors, (451), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-15 20:28:05,641 INFO L246 CegarLoopForPetriNet]: Found error trace [2021-10-15 20:28:05,641 INFO L254 CegarLoopForPetriNet]: trace histogram [24, 24, 23, 23, 13, 10, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-15 20:28:05,680 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Forceful destruction successful, exit code 0 [2021-10-15 20:28:05,857 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2021-10-15 20:28:05,857 INFO L402 AbstractCegarLoop]: === Iteration 28 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-15 20:28:05,857 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-15 20:28:05,857 INFO L82 PathProgramCache]: Analyzing trace with hash 1892133353, now seen corresponding path program 18 times [2021-10-15 20:28:05,857 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-15 20:28:05,858 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [880437442] [2021-10-15 20:28:05,858 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-15 20:28:05,858 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-15 20:28:05,913 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-15 20:28:06,229 INFO L134 CoverageAnalysis]: Checked inductivity of 1366 backedges. 0 proven. 576 refuted. 0 times theorem prover too weak. 790 trivial. 0 not checked. [2021-10-15 20:28:06,229 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-15 20:28:06,229 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [880437442] [2021-10-15 20:28:06,229 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [880437442] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-15 20:28:06,229 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [634538317] [2021-10-15 20:28:06,229 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-10-15 20:28:06,229 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-15 20:28:06,230 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/z3 [2021-10-15 20:28:06,236 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-15 20:28:06,251 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2021-10-15 20:28:07,741 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 24 check-sat command(s) [2021-10-15 20:28:07,741 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-15 20:28:07,746 INFO L263 TraceCheckSpWp]: Trace formula consists of 365 conjuncts, 39 conjunts are in the unsatisfiable core [2021-10-15 20:28:07,748 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-15 20:30:28,009 INFO L354 Elim1Store]: treesize reduction 288, result has 48.7 percent of original size [2021-10-15 20:30:28,010 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 9 select indices, 9 select index equivalence classes, 0 disjoint index pairs (out of 36 index pairs), introduced 9 new quantified variables, introduced 36 case distinctions, treesize of input 189 treesize of output 321 [2021-10-15 20:30:28,126 INFO L134 CoverageAnalysis]: Checked inductivity of 1366 backedges. 462 proven. 191 refuted. 18 times theorem prover too weak. 695 trivial. 0 not checked. [2021-10-15 20:30:28,127 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [634538317] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-15 20:30:28,127 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-10-15 20:30:28,127 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 25] total 50 [2021-10-15 20:30:28,127 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1006713456] [2021-10-15 20:30:28,127 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 50 states [2021-10-15 20:30:28,128 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-15 20:30:28,128 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2021-10-15 20:30:28,129 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=567, Invalid=1867, Unknown=16, NotChecked=0, Total=2450 [2021-10-15 20:30:28,129 INFO L499 CegarLoopForPetriNet]: Number of universal loopers: 4 out of 26 [2021-10-15 20:30:28,130 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 363 places, 356 transitions, 3617 flow. Second operand has 50 states, 50 states have (on average 6.3) internal successors, (315), 50 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) [2021-10-15 20:30:28,130 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-10-15 20:30:28,130 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 4 of 26 [2021-10-15 20:30:28,130 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-10-15 20:35:36,728 WARN L228 Executor]: External (MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1) with exit command (exit)) stderr output: (error "out of memory") [2021-10-15 20:35:36,732 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Forceful destruction successful, exit code 101 [2021-10-15 20:35:36,733 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 107 states. [2021-10-15 20:35:36,755 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Ended with exit code 0 [2021-10-15 20:35:36,947 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2021-10-15 20:35:36,947 FATAL L? ?]: An unrecoverable error occured during an interaction with an SMT solver: de.uni_freiburg.informatik.ultimate.logic.SMTLIBException: External (MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1) with exit command (exit)) Received EOF on stdin. stderr output: (error "out of memory") at de.uni_freiburg.informatik.ultimate.smtsolver.external.Executor.parse(Executor.java:241) at de.uni_freiburg.informatik.ultimate.smtsolver.external.Executor.parseSuccess(Executor.java:256) at de.uni_freiburg.informatik.ultimate.smtsolver.external.Scriptor.pop(Scriptor.java:140) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.arrays.DiffWrapperScript.pop(DiffWrapperScript.java:99) at de.uni_freiburg.informatik.ultimate.logic.WrapperScript.pop(WrapperScript.java:153) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.scripttransfer.HistoryRecordingScript.pop(HistoryRecordingScript.java:117) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.ManagedScript.pop(ManagedScript.java:128) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.MonolithicImplicationChecker.checkImplication(MonolithicImplicationChecker.java:86) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier$PredicateComparison.compare(PredicateUnifier.java:899) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier$PredicateComparison.(PredicateUnifier.java:773) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate(PredicateUnifier.java:345) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicateForConjunction(PredicateUnifier.java:388) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicateForConjunction(PredicateUnifier.java:229) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.interpolantautomata.transitionappender.DeterministicInterpolantAutomaton.getOrConstructPredicate(DeterministicInterpolantAutomaton.java:282) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.interpolantautomata.transitionappender.DeterministicInterpolantAutomaton.constructSuccessorsAndTransitions(DeterministicInterpolantAutomaton.java:304) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.interpolantautomata.transitionappender.BasicAbstractInterpolantAutomaton.computeSuccs(BasicAbstractInterpolantAutomaton.java:79) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.interpolantautomata.transitionappender.BasicAbstractInterpolantAutomaton.computeSuccs(BasicAbstractInterpolantAutomaton.java:1) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.interpolantautomata.transitionappender.AbstractInterpolantAutomaton.internalSuccessors(AbstractInterpolantAutomaton.java:233) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.interpolantautomata.transitionappender.AbstractInterpolantAutomaton.internalSuccessors(AbstractInterpolantAutomaton.java:1) at de.uni_freiburg.informatik.ultimate.automata.nestedword.NestedWordAutomataUtils.getSuccessorState(NestedWordAutomataUtils.java:483) at de.uni_freiburg.informatik.ultimate.automata.petrinet.operations.DifferencePetriNet$DifferenceSuccessorTransitionProvider.getOrConstructTransition(DifferencePetriNet.java:452) at de.uni_freiburg.informatik.ultimate.automata.petrinet.operations.DifferencePetriNet$DifferenceSuccessorTransitionProvider.getTransitions(DifferencePetriNet.java:433) at de.uni_freiburg.informatik.ultimate.automata.petrinet.unfolding.PossibleExtensions.addFullyInstantiatedCandidate(PossibleExtensions.java:171) at de.uni_freiburg.informatik.ultimate.automata.petrinet.unfolding.PossibleExtensions.evolveCandidate(PossibleExtensions.java:197) at de.uni_freiburg.informatik.ultimate.automata.petrinet.unfolding.PossibleExtensions.evolveCandidate(PossibleExtensions.java:212) at de.uni_freiburg.informatik.ultimate.automata.petrinet.unfolding.PossibleExtensions.update(PossibleExtensions.java:137) at de.uni_freiburg.informatik.ultimate.automata.petrinet.unfolding.PetriNetUnfolder.computeUnfoldingHelper(PetriNetUnfolder.java:208) at de.uni_freiburg.informatik.ultimate.automata.petrinet.unfolding.PetriNetUnfolder.computeUnfolding(PetriNetUnfolder.java:167) at de.uni_freiburg.informatik.ultimate.automata.petrinet.unfolding.PetriNetUnfolder.(PetriNetUnfolder.java:128) at de.uni_freiburg.informatik.ultimate.automata.petrinet.unfolding.FinitePrefix.(FinitePrefix.java:76) at de.uni_freiburg.informatik.ultimate.automata.petrinet.unfolding.FinitePrefix.(FinitePrefix.java:65) at de.uni_freiburg.informatik.ultimate.automata.petrinet.operations.DifferencePairwiseOnDemand.(DifferencePairwiseOnDemand.java:120) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.concurrency.CegarLoopForPetriNet.enhanceAnddeterminizeInterpolantAutomaton(CegarLoopForPetriNet.java:509) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.concurrency.CegarLoopForPetriNet.refineAbstraction(CegarLoopForPetriNet.java:280) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.refineAbstractionInternal(AbstractCegarLoop.java:462) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:420) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:53) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:392) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) Caused by: de.uni_freiburg.informatik.ultimate.logic.SMTLIBException: EOF at de.uni_freiburg.informatik.ultimate.smtsolver.external.Parser$Action$.CUP$do_action(Parser.java:1465) at de.uni_freiburg.informatik.ultimate.smtsolver.external.Parser.do_action(Parser.java:658) at com.github.jhoenicke.javacup.runtime.LRParser.parse(LRParser.java:383) at de.uni_freiburg.informatik.ultimate.smtsolver.external.Executor.parse(Executor.java:237) ... 54 more [2021-10-15 20:35:36,955 INFO L168 Benchmark]: Toolchain (without parser) took 489548.53 ms. Allocated memory was 98.6 MB in the beginning and 346.0 MB in the end (delta: 247.5 MB). Free memory was 65.6 MB in the beginning and 139.3 MB in the end (delta: -73.7 MB). Peak memory consumption was 173.4 MB. Max. memory is 16.1 GB. [2021-10-15 20:35:36,955 INFO L168 Benchmark]: CDTParser took 0.37 ms. Allocated memory is still 98.6 MB. Free memory is still 54.5 MB. There was no memory consumed. Max. memory is 16.1 GB. [2021-10-15 20:35:36,955 INFO L168 Benchmark]: CACSL2BoogieTranslator took 301.94 ms. Allocated memory is still 98.6 MB. Free memory was 65.5 MB in the beginning and 73.8 MB in the end (delta: -8.4 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. [2021-10-15 20:35:36,956 INFO L168 Benchmark]: Boogie Procedure Inliner took 39.73 ms. Allocated memory is still 98.6 MB. Free memory was 73.8 MB in the beginning and 72.4 MB in the end (delta: 1.4 MB). There was no memory consumed. Max. memory is 16.1 GB. [2021-10-15 20:35:36,956 INFO L168 Benchmark]: Boogie Preprocessor took 27.62 ms. Allocated memory is still 98.6 MB. Free memory was 72.4 MB in the beginning and 71.1 MB in the end (delta: 1.3 MB). Peak memory consumption was 4.2 MB. Max. memory is 16.1 GB. [2021-10-15 20:35:36,957 INFO L168 Benchmark]: RCFGBuilder took 336.98 ms. Allocated memory is still 98.6 MB. Free memory was 71.1 MB in the beginning and 61.4 MB in the end (delta: 9.7 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. [2021-10-15 20:35:36,957 INFO L168 Benchmark]: TraceAbstraction took 488823.03 ms. Allocated memory was 98.6 MB in the beginning and 346.0 MB in the end (delta: 247.5 MB). Free memory was 60.9 MB in the beginning and 139.3 MB in the end (delta: -78.4 MB). Peak memory consumption was 170.2 MB. Max. memory is 16.1 GB. [2021-10-15 20:35:36,959 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.37 ms. Allocated memory is still 98.6 MB. Free memory is still 54.5 MB. There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 301.94 ms. Allocated memory is still 98.6 MB. Free memory was 65.5 MB in the beginning and 73.8 MB in the end (delta: -8.4 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. * Boogie Procedure Inliner took 39.73 ms. Allocated memory is still 98.6 MB. Free memory was 73.8 MB in the beginning and 72.4 MB in the end (delta: 1.4 MB). There was no memory consumed. Max. memory is 16.1 GB. * Boogie Preprocessor took 27.62 ms. Allocated memory is still 98.6 MB. Free memory was 72.4 MB in the beginning and 71.1 MB in the end (delta: 1.3 MB). Peak memory consumption was 4.2 MB. Max. memory is 16.1 GB. * RCFGBuilder took 336.98 ms. Allocated memory is still 98.6 MB. Free memory was 71.1 MB in the beginning and 61.4 MB in the end (delta: 9.7 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. * TraceAbstraction took 488823.03 ms. Allocated memory was 98.6 MB in the beginning and 346.0 MB in the end (delta: 247.5 MB). Free memory was 60.9 MB in the beginning and 139.3 MB in the end (delta: -78.4 MB). Peak memory consumption was 170.2 MB. Max. memory is 16.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - ExceptionOrErrorResult: SMTLIBException: External (MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1) with exit command (exit)) Received EOF on stdin. stderr output: (error "out of memory") de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMTLIBException: External (MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1) with exit command (exit)) Received EOF on stdin. stderr output: (error "out of memory") : de.uni_freiburg.informatik.ultimate.smtsolver.external.Executor.parse(Executor.java:241) RESULT: Ultimate could not prove your program: Toolchain returned no result. Received shutdown request... ### Bit-precise run ### This is Ultimate 0.2.1-dev-5709675 [2021-10-15 20:35:38,995 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-10-15 20:35:38,999 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-10-15 20:35:39,051 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-10-15 20:35:39,052 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-10-15 20:35:39,056 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-10-15 20:35:39,058 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-10-15 20:35:39,064 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-10-15 20:35:39,067 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-10-15 20:35:39,072 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-10-15 20:35:39,074 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-10-15 20:35:39,075 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-10-15 20:35:39,076 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-10-15 20:35:39,078 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-10-15 20:35:39,080 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-10-15 20:35:39,085 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-10-15 20:35:39,086 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-10-15 20:35:39,088 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-10-15 20:35:39,089 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-10-15 20:35:39,097 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-10-15 20:35:39,099 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-10-15 20:35:39,100 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-10-15 20:35:39,102 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-10-15 20:35:39,104 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-10-15 20:35:39,113 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-10-15 20:35:39,114 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-10-15 20:35:39,114 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-10-15 20:35:39,116 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-10-15 20:35:39,117 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-10-15 20:35:39,118 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-10-15 20:35:39,118 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-10-15 20:35:39,119 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-10-15 20:35:39,121 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-10-15 20:35:39,122 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-10-15 20:35:39,124 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-10-15 20:35:39,124 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-10-15 20:35:39,125 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-10-15 20:35:39,125 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-10-15 20:35:39,125 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-10-15 20:35:39,127 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-10-15 20:35:39,128 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-10-15 20:35:39,133 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/config/svcomp-Reach-32bit-Automizer_Bitvector.epf [2021-10-15 20:35:39,186 INFO L113 SettingsManager]: Loading preferences was successful [2021-10-15 20:35:39,186 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-10-15 20:35:39,187 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-10-15 20:35:39,187 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-10-15 20:35:39,189 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-10-15 20:35:39,190 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-10-15 20:35:39,190 INFO L138 SettingsManager]: * Use SBE=true [2021-10-15 20:35:39,190 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-10-15 20:35:39,190 INFO L138 SettingsManager]: * sizeof long=4 [2021-10-15 20:35:39,191 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-10-15 20:35:39,192 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-10-15 20:35:39,192 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-10-15 20:35:39,192 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-10-15 20:35:39,192 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-10-15 20:35:39,193 INFO L138 SettingsManager]: * Use bitvectors instead of ints=true [2021-10-15 20:35:39,193 INFO L138 SettingsManager]: * Memory model=HoenickeLindenmann_4ByteResolution [2021-10-15 20:35:39,193 INFO L138 SettingsManager]: * sizeof long double=12 [2021-10-15 20:35:39,194 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-10-15 20:35:39,194 INFO L138 SettingsManager]: * Use constant arrays=true [2021-10-15 20:35:39,194 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-10-15 20:35:39,194 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-10-15 20:35:39,195 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-10-15 20:35:39,195 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-10-15 20:35:39,195 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-10-15 20:35:39,195 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-10-15 20:35:39,196 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-10-15 20:35:39,196 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-10-15 20:35:39,196 INFO L138 SettingsManager]: * Trace refinement strategy=WOLF [2021-10-15 20:35:39,197 INFO L138 SettingsManager]: * Command for external solver=cvc4 --incremental --print-success --lang smt [2021-10-15 20:35:39,197 INFO L138 SettingsManager]: * Large block encoding in concurrent analysis=OFF [2021-10-15 20:35:39,197 INFO L138 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2021-10-15 20:35:39,197 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-10-15 20:35:39,198 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-10-15 20:35:39,198 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-10-15 20:35:39,198 INFO L138 SettingsManager]: * Logic for external solver=AUFBV WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 992823d82462469458f99b979532c5f9f46cefb5 [2021-10-15 20:35:39,552 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-10-15 20:35:39,571 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-10-15 20:35:39,574 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-10-15 20:35:39,575 INFO L271 PluginConnector]: Initializing CDTParser... [2021-10-15 20:35:39,576 INFO L275 PluginConnector]: CDTParser initialized [2021-10-15 20:35:39,577 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/../../sv-benchmarks/c/array-examples/sanfoundry_27_ground.i [2021-10-15 20:35:39,629 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/data/dc8a6c5ad/7575a9bae6704c22bbcad7cc76b2380f/FLAGb3723c91d [2021-10-15 20:35:40,134 INFO L306 CDTParser]: Found 1 translation units. [2021-10-15 20:35:40,135 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/sv-benchmarks/c/array-examples/sanfoundry_27_ground.i [2021-10-15 20:35:40,140 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/data/dc8a6c5ad/7575a9bae6704c22bbcad7cc76b2380f/FLAGb3723c91d [2021-10-15 20:35:40,456 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/data/dc8a6c5ad/7575a9bae6704c22bbcad7cc76b2380f [2021-10-15 20:35:40,459 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-10-15 20:35:40,460 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-10-15 20:35:40,461 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-10-15 20:35:40,462 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-10-15 20:35:40,465 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-10-15 20:35:40,466 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 15.10 08:35:40" (1/1) ... [2021-10-15 20:35:40,467 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7eba8045 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 08:35:40, skipping insertion in model container [2021-10-15 20:35:40,467 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 15.10 08:35:40" (1/1) ... [2021-10-15 20:35:40,474 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-10-15 20:35:40,488 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-10-15 20:35:40,615 WARN L228 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/sv-benchmarks/c/array-examples/sanfoundry_27_ground.i[813,826] [2021-10-15 20:35:40,628 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-10-15 20:35:40,637 INFO L203 MainTranslator]: Completed pre-run [2021-10-15 20:35:40,656 WARN L228 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/sv-benchmarks/c/array-examples/sanfoundry_27_ground.i[813,826] [2021-10-15 20:35:40,670 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-10-15 20:35:40,682 INFO L208 MainTranslator]: Completed translation [2021-10-15 20:35:40,683 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 08:35:40 WrapperNode [2021-10-15 20:35:40,683 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-10-15 20:35:40,684 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-10-15 20:35:40,684 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-10-15 20:35:40,684 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-10-15 20:35:40,691 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 08:35:40" (1/1) ... [2021-10-15 20:35:40,699 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 08:35:40" (1/1) ... [2021-10-15 20:35:40,716 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-10-15 20:35:40,717 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-10-15 20:35:40,717 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-10-15 20:35:40,718 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-10-15 20:35:40,725 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 08:35:40" (1/1) ... [2021-10-15 20:35:40,726 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 08:35:40" (1/1) ... [2021-10-15 20:35:40,728 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 08:35:40" (1/1) ... [2021-10-15 20:35:40,729 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 08:35:40" (1/1) ... [2021-10-15 20:35:40,735 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 08:35:40" (1/1) ... [2021-10-15 20:35:40,739 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 08:35:40" (1/1) ... [2021-10-15 20:35:40,741 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 08:35:40" (1/1) ... [2021-10-15 20:35:40,743 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-10-15 20:35:40,744 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-10-15 20:35:40,744 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-10-15 20:35:40,744 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-10-15 20:35:40,772 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 08:35:40" (1/1) ... [2021-10-15 20:35:40,782 INFO L170 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-10-15 20:35:40,795 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/z3 [2021-10-15 20:35:40,809 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-10-15 20:35:40,814 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-10-15 20:35:40,844 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE1 [2021-10-15 20:35:40,844 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-10-15 20:35:40,844 INFO L130 BoogieDeclarations]: Found specification of procedure read~intINTTYPE4 [2021-10-15 20:35:40,844 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-10-15 20:35:40,844 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-10-15 20:35:40,845 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-10-15 20:35:40,845 INFO L130 BoogieDeclarations]: Found specification of procedure write~intINTTYPE4 [2021-10-15 20:35:41,115 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-10-15 20:35:41,115 INFO L299 CfgBuilder]: Removed 9 assume(true) statements. [2021-10-15 20:35:41,117 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 15.10 08:35:41 BoogieIcfgContainer [2021-10-15 20:35:41,117 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-10-15 20:35:41,119 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-10-15 20:35:41,119 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-10-15 20:35:41,122 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-10-15 20:35:41,122 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 15.10 08:35:40" (1/3) ... [2021-10-15 20:35:41,123 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@77e45086 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 15.10 08:35:41, skipping insertion in model container [2021-10-15 20:35:41,123 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 08:35:40" (2/3) ... [2021-10-15 20:35:41,123 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@77e45086 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 15.10 08:35:41, skipping insertion in model container [2021-10-15 20:35:41,123 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 15.10 08:35:41" (3/3) ... [2021-10-15 20:35:41,125 INFO L111 eAbstractionObserver]: Analyzing ICFG sanfoundry_27_ground.i [2021-10-15 20:35:41,130 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-10-15 20:35:41,131 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-10-15 20:35:41,176 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-10-15 20:35:41,183 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, mConcurrency=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 [2021-10-15 20:35:41,183 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-10-15 20:35:41,193 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 19 places, 26 transitions, 52 flow [2021-10-15 20:35:41,212 INFO L129 PetriNetUnfolder]: 8/26 cut-off events. [2021-10-15 20:35:41,213 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-10-15 20:35:41,214 INFO L84 FinitePrefix]: Finished finitePrefix Result has 27 conditions, 26 events. 8/26 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 3. Compared 28 event pairs, 0 based on Foata normal form. 0/17 useless extension candidates. Maximal degree in co-relation 0. Up to 2 conditions per place. [2021-10-15 20:35:41,215 INFO L82 GeneralOperation]: Start removeDead. Operand has 19 places, 26 transitions, 52 flow [2021-10-15 20:35:41,219 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 15 places, 21 transitions, 42 flow [2021-10-15 20:35:41,223 INFO L129 PetriNetUnfolder]: 7/20 cut-off events. [2021-10-15 20:35:41,223 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-10-15 20:35:41,223 INFO L246 CegarLoopForPetriNet]: Found error trace [2021-10-15 20:35:41,224 INFO L254 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-15 20:35:41,224 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-15 20:35:41,229 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-15 20:35:41,230 INFO L82 PathProgramCache]: Analyzing trace with hash -986241125, now seen corresponding path program 1 times [2021-10-15 20:35:41,241 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-10-15 20:35:41,241 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1858350695] [2021-10-15 20:35:41,242 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-15 20:35:41,242 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-15 20:35:41,243 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/mathsat [2021-10-15 20:35:41,246 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-15 20:35:41,292 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/mathsat -unsat_core_generation=3 (2)] Waiting until timeout for monitored process [2021-10-15 20:35:41,349 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-15 20:35:41,352 INFO L263 TraceCheckSpWp]: Trace formula consists of 35 conjuncts, 1 conjunts are in the unsatisfiable core [2021-10-15 20:35:41,356 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-15 20:35:41,407 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-15 20:35:41,407 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-15 20:35:41,442 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-15 20:35:41,443 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-10-15 20:35:41,443 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1858350695] [2021-10-15 20:35:41,444 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1858350695] provided 2 perfect and 0 imperfect interpolant sequences [2021-10-15 20:35:41,444 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-10-15 20:35:41,445 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2, 2] imperfect sequences [] total 2 [2021-10-15 20:35:41,446 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1099612660] [2021-10-15 20:35:41,454 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2021-10-15 20:35:41,455 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-10-15 20:35:41,467 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-10-15 20:35:41,472 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-10-15 20:35:41,473 INFO L499 CegarLoopForPetriNet]: Number of universal loopers: 22 out of 26 [2021-10-15 20:35:41,477 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 15 places, 21 transitions, 42 flow. Second operand has 2 states, 2 states have (on average 22.5) internal successors, (45), 2 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-15 20:35:41,477 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-10-15 20:35:41,478 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 22 of 26 [2021-10-15 20:35:41,480 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-10-15 20:35:41,494 INFO L129 PetriNetUnfolder]: 4/18 cut-off events. [2021-10-15 20:35:41,494 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-10-15 20:35:41,496 INFO L84 FinitePrefix]: Finished finitePrefix Result has 20 conditions, 18 events. 4/18 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 2. Compared 13 event pairs, 0 based on Foata normal form. 3/17 useless extension candidates. Maximal degree in co-relation 18. Up to 2 conditions per place. [2021-10-15 20:35:41,498 INFO L132 encePairwiseOnDemand]: 23/26 looper letters, 0 selfloop transitions, 0 changer transitions 0/18 dead transitions. [2021-10-15 20:35:41,498 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 16 places, 18 transitions, 36 flow [2021-10-15 20:35:41,499 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-10-15 20:35:41,501 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2 states. [2021-10-15 20:35:41,508 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2 states to 2 states and 47 transitions. [2021-10-15 20:35:41,510 INFO L544 CegarLoopForPetriNet]: DFA transition density 0.9038461538461539 [2021-10-15 20:35:41,511 INFO L72 ComplementDD]: Start complementDD. Operand 2 states and 47 transitions. [2021-10-15 20:35:41,511 INFO L73 IsDeterministic]: Start isDeterministic. Operand 2 states and 47 transitions. [2021-10-15 20:35:41,512 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-10-15 20:35:41,514 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 2 states and 47 transitions. [2021-10-15 20:35:41,517 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 3 states, 2 states have (on average 23.5) internal successors, (47), 2 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-15 20:35:41,523 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 3 states, 3 states have (on average 26.0) internal successors, (78), 3 states have internal predecessors, (78), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-15 20:35:41,524 INFO L81 ComplementDD]: Finished complementDD. Result has 3 states, 3 states have (on average 26.0) internal successors, (78), 3 states have internal predecessors, (78), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-15 20:35:41,526 INFO L186 Difference]: Start difference. First operand has 15 places, 21 transitions, 42 flow. Second operand 2 states and 47 transitions. [2021-10-15 20:35:41,527 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 16 places, 18 transitions, 36 flow [2021-10-15 20:35:41,529 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 16 places, 18 transitions, 36 flow, removed 0 selfloop flow, removed 0 redundant places. [2021-10-15 20:35:41,532 INFO L242 Difference]: Finished difference. Result has 16 places, 18 transitions, 36 flow [2021-10-15 20:35:41,534 INFO L317 CegarLoopForPetriNet]: {PETRI_ALPHABET=26, PETRI_DIFFERENCE_MINUEND_FLOW=36, PETRI_DIFFERENCE_MINUEND_PLACES=15, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=18, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=0, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=18, PETRI_DIFFERENCE_SUBTRAHEND_STATES=2, PETRI_FLOW=36, PETRI_PLACES=16, PETRI_TRANSITIONS=18} [2021-10-15 20:35:41,535 INFO L334 CegarLoopForPetriNet]: 15 programPoint places, 1 predicate places. [2021-10-15 20:35:41,535 INFO L470 AbstractCegarLoop]: Abstraction has has 16 places, 18 transitions, 36 flow [2021-10-15 20:35:41,536 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 22.5) internal successors, (45), 2 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-15 20:35:41,536 INFO L246 CegarLoopForPetriNet]: Found error trace [2021-10-15 20:35:41,537 INFO L254 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-15 20:35:41,552 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/mathsat -unsat_core_generation=3 (2)] Forceful destruction successful, exit code 0 [2021-10-15 20:35:41,751 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/mathsat -unsat_core_generation=3 [2021-10-15 20:35:41,752 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-15 20:35:41,752 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-15 20:35:41,753 INFO L82 PathProgramCache]: Analyzing trace with hash -2016295915, now seen corresponding path program 1 times [2021-10-15 20:35:41,756 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-10-15 20:35:41,757 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1351887713] [2021-10-15 20:35:41,757 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-15 20:35:41,757 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-15 20:35:41,758 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/mathsat [2021-10-15 20:35:41,759 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-15 20:35:41,801 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/mathsat -unsat_core_generation=3 (3)] Waiting until timeout for monitored process [2021-10-15 20:35:41,846 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-15 20:35:41,847 INFO L263 TraceCheckSpWp]: Trace formula consists of 35 conjuncts, 2 conjunts are in the unsatisfiable core [2021-10-15 20:35:41,849 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-15 20:35:41,918 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-15 20:35:41,919 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-15 20:35:41,986 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-15 20:35:41,986 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-10-15 20:35:41,987 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1351887713] [2021-10-15 20:35:41,987 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1351887713] provided 2 perfect and 0 imperfect interpolant sequences [2021-10-15 20:35:41,987 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-10-15 20:35:41,988 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 4 [2021-10-15 20:35:41,988 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1598977125] [2021-10-15 20:35:41,989 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-10-15 20:35:41,989 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-10-15 20:35:41,990 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-10-15 20:35:41,993 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-10-15 20:35:41,994 INFO L499 CegarLoopForPetriNet]: Number of universal loopers: 13 out of 26 [2021-10-15 20:35:41,996 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 16 places, 18 transitions, 36 flow. Second operand has 4 states, 4 states have (on average 14.5) internal successors, (58), 4 states have internal predecessors, (58), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-15 20:35:41,996 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-10-15 20:35:41,997 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 13 of 26 [2021-10-15 20:35:41,997 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-10-15 20:35:42,057 INFO L129 PetriNetUnfolder]: 4/22 cut-off events. [2021-10-15 20:35:42,063 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-10-15 20:35:42,063 INFO L84 FinitePrefix]: Finished finitePrefix Result has 38 conditions, 22 events. 4/22 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 2. Compared 7 event pairs, 0 based on Foata normal form. 0/19 useless extension candidates. Maximal degree in co-relation 35. Up to 7 conditions per place. [2021-10-15 20:35:42,064 INFO L132 encePairwiseOnDemand]: 18/26 looper letters, 6 selfloop transitions, 7 changer transitions 0/22 dead transitions. [2021-10-15 20:35:42,064 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 19 places, 22 transitions, 70 flow [2021-10-15 20:35:42,065 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-10-15 20:35:42,065 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4 states. [2021-10-15 20:35:42,067 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4 states to 4 states and 68 transitions. [2021-10-15 20:35:42,067 INFO L544 CegarLoopForPetriNet]: DFA transition density 0.6538461538461539 [2021-10-15 20:35:42,068 INFO L72 ComplementDD]: Start complementDD. Operand 4 states and 68 transitions. [2021-10-15 20:35:42,068 INFO L73 IsDeterministic]: Start isDeterministic. Operand 4 states and 68 transitions. [2021-10-15 20:35:42,069 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-10-15 20:35:42,069 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 4 states and 68 transitions. [2021-10-15 20:35:42,072 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 5 states, 4 states have (on average 17.0) internal successors, (68), 4 states have internal predecessors, (68), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-15 20:35:42,074 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 5 states, 5 states have (on average 26.0) internal successors, (130), 5 states have internal predecessors, (130), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-15 20:35:42,075 INFO L81 ComplementDD]: Finished complementDD. Result has 5 states, 5 states have (on average 26.0) internal successors, (130), 5 states have internal predecessors, (130), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-15 20:35:42,075 INFO L186 Difference]: Start difference. First operand has 16 places, 18 transitions, 36 flow. Second operand 4 states and 68 transitions. [2021-10-15 20:35:42,075 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 19 places, 22 transitions, 70 flow [2021-10-15 20:35:42,077 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 19 places, 22 transitions, 70 flow, removed 0 selfloop flow, removed 0 redundant places. [2021-10-15 20:35:42,079 INFO L242 Difference]: Finished difference. Result has 22 places, 21 transitions, 80 flow [2021-10-15 20:35:42,080 INFO L317 CegarLoopForPetriNet]: {PETRI_ALPHABET=26, PETRI_DIFFERENCE_MINUEND_FLOW=36, PETRI_DIFFERENCE_MINUEND_PLACES=16, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=18, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=4, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=12, PETRI_DIFFERENCE_SUBTRAHEND_STATES=4, PETRI_FLOW=80, PETRI_PLACES=22, PETRI_TRANSITIONS=21} [2021-10-15 20:35:42,080 INFO L334 CegarLoopForPetriNet]: 15 programPoint places, 7 predicate places. [2021-10-15 20:35:42,081 INFO L470 AbstractCegarLoop]: Abstraction has has 22 places, 21 transitions, 80 flow [2021-10-15 20:35:42,081 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 14.5) internal successors, (58), 4 states have internal predecessors, (58), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-15 20:35:42,081 INFO L246 CegarLoopForPetriNet]: Found error trace [2021-10-15 20:35:42,081 INFO L254 CegarLoopForPetriNet]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-15 20:35:42,101 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/mathsat -unsat_core_generation=3 (3)] Forceful destruction successful, exit code 0 [2021-10-15 20:35:42,293 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/mathsat -unsat_core_generation=3 [2021-10-15 20:35:42,293 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-15 20:35:42,294 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-15 20:35:42,294 INFO L82 PathProgramCache]: Analyzing trace with hash 617081941, now seen corresponding path program 1 times [2021-10-15 20:35:42,295 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-10-15 20:35:42,295 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1626210985] [2021-10-15 20:35:42,295 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-15 20:35:42,296 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-15 20:35:42,296 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/mathsat [2021-10-15 20:35:42,304 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-15 20:35:42,318 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/mathsat -unsat_core_generation=3 (4)] Waiting until timeout for monitored process [2021-10-15 20:35:42,379 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-15 20:35:42,381 INFO L263 TraceCheckSpWp]: Trace formula consists of 45 conjuncts, 4 conjunts are in the unsatisfiable core [2021-10-15 20:35:42,383 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-15 20:35:42,452 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-15 20:35:42,452 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-15 20:35:42,540 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-15 20:35:42,540 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-10-15 20:35:42,540 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1626210985] [2021-10-15 20:35:42,541 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1626210985] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-15 20:35:42,541 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-10-15 20:35:42,541 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 8 [2021-10-15 20:35:42,541 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1570353327] [2021-10-15 20:35:42,542 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-10-15 20:35:42,542 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-10-15 20:35:42,543 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-10-15 20:35:42,543 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2021-10-15 20:35:42,545 INFO L499 CegarLoopForPetriNet]: Number of universal loopers: 13 out of 26 [2021-10-15 20:35:42,545 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 22 places, 21 transitions, 80 flow. Second operand has 8 states, 8 states have (on average 15.0) internal successors, (120), 8 states have internal predecessors, (120), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-15 20:35:42,545 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-10-15 20:35:42,546 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 13 of 26 [2021-10-15 20:35:42,546 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-10-15 20:35:42,739 INFO L129 PetriNetUnfolder]: 8/46 cut-off events. [2021-10-15 20:35:42,739 INFO L130 PetriNetUnfolder]: For 19/19 co-relation queries the response was YES. [2021-10-15 20:35:42,740 INFO L84 FinitePrefix]: Finished finitePrefix Result has 137 conditions, 46 events. 8/46 cut-off events. For 19/19 co-relation queries the response was YES. Maximal size of possible extension queue 2. Compared 11 event pairs, 0 based on Foata normal form. 8/53 useless extension candidates. Maximal degree in co-relation 131. Up to 15 conditions per place. [2021-10-15 20:35:42,741 INFO L132 encePairwiseOnDemand]: 18/26 looper letters, 18 selfloop transitions, 15 changer transitions 0/42 dead transitions. [2021-10-15 20:35:42,741 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 29 places, 42 transitions, 254 flow [2021-10-15 20:35:42,741 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-10-15 20:35:42,741 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 8 states. [2021-10-15 20:35:42,743 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8 states to 8 states and 145 transitions. [2021-10-15 20:35:42,743 INFO L544 CegarLoopForPetriNet]: DFA transition density 0.6971153846153846 [2021-10-15 20:35:42,744 INFO L72 ComplementDD]: Start complementDD. Operand 8 states and 145 transitions. [2021-10-15 20:35:42,744 INFO L73 IsDeterministic]: Start isDeterministic. Operand 8 states and 145 transitions. [2021-10-15 20:35:42,744 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-10-15 20:35:42,745 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 8 states and 145 transitions. [2021-10-15 20:35:42,746 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 9 states, 8 states have (on average 18.125) internal successors, (145), 8 states have internal predecessors, (145), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-15 20:35:42,748 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 9 states, 9 states have (on average 26.0) internal successors, (234), 9 states have internal predecessors, (234), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-15 20:35:42,748 INFO L81 ComplementDD]: Finished complementDD. Result has 9 states, 9 states have (on average 26.0) internal successors, (234), 9 states have internal predecessors, (234), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-15 20:35:42,748 INFO L186 Difference]: Start difference. First operand has 22 places, 21 transitions, 80 flow. Second operand 8 states and 145 transitions. [2021-10-15 20:35:42,748 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 29 places, 42 transitions, 254 flow [2021-10-15 20:35:42,751 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 29 places, 42 transitions, 254 flow, removed 0 selfloop flow, removed 0 redundant places. [2021-10-15 20:35:42,753 INFO L242 Difference]: Finished difference. Result has 34 places, 31 transitions, 214 flow [2021-10-15 20:35:42,754 INFO L317 CegarLoopForPetriNet]: {PETRI_ALPHABET=26, PETRI_DIFFERENCE_MINUEND_FLOW=80, PETRI_DIFFERENCE_MINUEND_PLACES=22, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=21, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=5, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=14, PETRI_DIFFERENCE_SUBTRAHEND_STATES=8, PETRI_FLOW=214, PETRI_PLACES=34, PETRI_TRANSITIONS=31} [2021-10-15 20:35:42,754 INFO L334 CegarLoopForPetriNet]: 15 programPoint places, 19 predicate places. [2021-10-15 20:35:42,754 INFO L470 AbstractCegarLoop]: Abstraction has has 34 places, 31 transitions, 214 flow [2021-10-15 20:35:42,754 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 15.0) internal successors, (120), 8 states have internal predecessors, (120), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-15 20:35:42,755 INFO L246 CegarLoopForPetriNet]: Found error trace [2021-10-15 20:35:42,755 INFO L254 CegarLoopForPetriNet]: trace histogram [6, 6, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-15 20:35:42,772 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/mathsat -unsat_core_generation=3 (4)] Forceful destruction successful, exit code 0 [2021-10-15 20:35:42,966 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/mathsat -unsat_core_generation=3 [2021-10-15 20:35:42,967 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-15 20:35:42,968 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-15 20:35:42,968 INFO L82 PathProgramCache]: Analyzing trace with hash -1836269987, now seen corresponding path program 2 times [2021-10-15 20:35:42,969 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-10-15 20:35:42,970 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [672905054] [2021-10-15 20:35:42,970 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-10-15 20:35:42,970 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-15 20:35:42,970 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/mathsat [2021-10-15 20:35:42,971 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-15 20:35:42,972 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/mathsat -unsat_core_generation=3 (5)] Waiting until timeout for monitored process [2021-10-15 20:35:43,043 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 1 check-sat command(s) [2021-10-15 20:35:43,043 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-15 20:35:43,045 INFO L263 TraceCheckSpWp]: Trace formula consists of 35 conjuncts, 7 conjunts are in the unsatisfiable core [2021-10-15 20:35:43,047 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-15 20:35:43,350 INFO L134 CoverageAnalysis]: Checked inductivity of 71 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 71 trivial. 0 not checked. [2021-10-15 20:35:43,351 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-15 20:35:43,509 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-10-15 20:35:43,540 INFO L134 CoverageAnalysis]: Checked inductivity of 71 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 71 trivial. 0 not checked. [2021-10-15 20:35:43,541 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-10-15 20:35:43,541 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [672905054] [2021-10-15 20:35:43,541 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [672905054] provided 2 perfect and 0 imperfect interpolant sequences [2021-10-15 20:35:43,542 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-10-15 20:35:43,542 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6, 5] imperfect sequences [] total 9 [2021-10-15 20:35:43,542 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1040458748] [2021-10-15 20:35:43,543 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-10-15 20:35:43,543 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-10-15 20:35:43,543 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-10-15 20:35:43,544 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2021-10-15 20:35:43,544 INFO L499 CegarLoopForPetriNet]: Number of universal loopers: 8 out of 26 [2021-10-15 20:35:43,545 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 34 places, 31 transitions, 214 flow. Second operand has 9 states, 9 states have (on average 9.88888888888889) internal successors, (89), 9 states have internal predecessors, (89), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-15 20:35:43,545 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-10-15 20:35:43,545 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 8 of 26 [2021-10-15 20:35:43,545 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-10-15 20:35:43,779 INFO L129 PetriNetUnfolder]: 13/78 cut-off events. [2021-10-15 20:35:43,779 INFO L130 PetriNetUnfolder]: For 100/100 co-relation queries the response was YES. [2021-10-15 20:35:43,780 INFO L84 FinitePrefix]: Finished finitePrefix Result has 278 conditions, 78 events. 13/78 cut-off events. For 100/100 co-relation queries the response was YES. Maximal size of possible extension queue 3. Compared 68 event pairs, 0 based on Foata normal form. 0/67 useless extension candidates. Maximal degree in co-relation 267. Up to 30 conditions per place. [2021-10-15 20:35:43,781 INFO L132 encePairwiseOnDemand]: 18/26 looper letters, 19 selfloop transitions, 11 changer transitions 0/45 dead transitions. [2021-10-15 20:35:43,781 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 42 places, 45 transitions, 316 flow [2021-10-15 20:35:43,782 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-10-15 20:35:43,782 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 9 states. [2021-10-15 20:35:43,783 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9 states to 9 states and 98 transitions. [2021-10-15 20:35:43,784 INFO L544 CegarLoopForPetriNet]: DFA transition density 0.4188034188034188 [2021-10-15 20:35:43,784 INFO L72 ComplementDD]: Start complementDD. Operand 9 states and 98 transitions. [2021-10-15 20:35:43,784 INFO L73 IsDeterministic]: Start isDeterministic. Operand 9 states and 98 transitions. [2021-10-15 20:35:43,784 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-10-15 20:35:43,784 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 9 states and 98 transitions. [2021-10-15 20:35:43,785 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 10 states, 9 states have (on average 10.88888888888889) internal successors, (98), 9 states have internal predecessors, (98), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-15 20:35:43,786 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 10 states, 10 states have (on average 26.0) internal successors, (260), 10 states have internal predecessors, (260), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-15 20:35:43,786 INFO L81 ComplementDD]: Finished complementDD. Result has 10 states, 10 states have (on average 26.0) internal successors, (260), 10 states have internal predecessors, (260), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-15 20:35:43,786 INFO L186 Difference]: Start difference. First operand has 34 places, 31 transitions, 214 flow. Second operand 9 states and 98 transitions. [2021-10-15 20:35:43,787 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 42 places, 45 transitions, 316 flow [2021-10-15 20:35:43,792 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 41 places, 45 transitions, 314 flow, removed 0 selfloop flow, removed 1 redundant places. [2021-10-15 20:35:43,794 INFO L242 Difference]: Finished difference. Result has 43 places, 40 transitions, 272 flow [2021-10-15 20:35:43,794 INFO L317 CegarLoopForPetriNet]: {PETRI_ALPHABET=26, PETRI_DIFFERENCE_MINUEND_FLOW=212, PETRI_DIFFERENCE_MINUEND_PLACES=33, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=31, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=4, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=24, PETRI_DIFFERENCE_SUBTRAHEND_STATES=9, PETRI_FLOW=272, PETRI_PLACES=43, PETRI_TRANSITIONS=40} [2021-10-15 20:35:43,794 INFO L334 CegarLoopForPetriNet]: 15 programPoint places, 28 predicate places. [2021-10-15 20:35:43,794 INFO L470 AbstractCegarLoop]: Abstraction has has 43 places, 40 transitions, 272 flow [2021-10-15 20:35:43,795 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 9.88888888888889) internal successors, (89), 9 states have internal predecessors, (89), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-15 20:35:43,795 INFO L246 CegarLoopForPetriNet]: Found error trace [2021-10-15 20:35:43,795 INFO L254 CegarLoopForPetriNet]: trace histogram [6, 6, 5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-15 20:35:43,832 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/mathsat -unsat_core_generation=3 (5)] Forceful destruction successful, exit code 0 [2021-10-15 20:35:43,995 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/mathsat -unsat_core_generation=3 [2021-10-15 20:35:43,996 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-15 20:35:43,996 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-15 20:35:43,996 INFO L82 PathProgramCache]: Analyzing trace with hash 683689947, now seen corresponding path program 1 times [2021-10-15 20:35:43,997 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-10-15 20:35:43,997 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2063503926] [2021-10-15 20:35:43,997 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-15 20:35:43,997 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-15 20:35:43,997 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/mathsat [2021-10-15 20:35:43,999 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-15 20:35:44,012 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/mathsat -unsat_core_generation=3 (6)] Waiting until timeout for monitored process [2021-10-15 20:35:44,124 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-15 20:35:44,129 INFO L263 TraceCheckSpWp]: Trace formula consists of 74 conjuncts, 8 conjunts are in the unsatisfiable core [2021-10-15 20:35:44,131 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-15 20:35:44,305 INFO L134 CoverageAnalysis]: Checked inductivity of 71 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2021-10-15 20:35:44,306 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-15 20:35:44,603 INFO L134 CoverageAnalysis]: Checked inductivity of 71 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2021-10-15 20:35:44,604 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-10-15 20:35:44,604 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2063503926] [2021-10-15 20:35:44,604 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2063503926] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-15 20:35:44,604 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-10-15 20:35:44,605 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 16 [2021-10-15 20:35:44,605 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [579795187] [2021-10-15 20:35:44,605 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-10-15 20:35:44,606 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-10-15 20:35:44,606 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-10-15 20:35:44,607 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=162, Unknown=0, NotChecked=0, Total=240 [2021-10-15 20:35:44,608 INFO L499 CegarLoopForPetriNet]: Number of universal loopers: 13 out of 26 [2021-10-15 20:35:44,608 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 43 places, 40 transitions, 272 flow. Second operand has 16 states, 16 states have (on average 15.0625) internal successors, (241), 16 states have internal predecessors, (241), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-15 20:35:44,608 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-10-15 20:35:44,609 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 13 of 26 [2021-10-15 20:35:44,609 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-10-15 20:35:45,481 INFO L129 PetriNetUnfolder]: 29/158 cut-off events. [2021-10-15 20:35:45,481 INFO L130 PetriNetUnfolder]: For 388/388 co-relation queries the response was YES. [2021-10-15 20:35:45,490 INFO L84 FinitePrefix]: Finished finitePrefix Result has 668 conditions, 158 events. 29/158 cut-off events. For 388/388 co-relation queries the response was YES. Maximal size of possible extension queue 3. Compared 152 event pairs, 0 based on Foata normal form. 24/182 useless extension candidates. Maximal degree in co-relation 654. Up to 50 conditions per place. [2021-10-15 20:35:45,493 INFO L132 encePairwiseOnDemand]: 18/26 looper letters, 54 selfloop transitions, 31 changer transitions 0/102 dead transitions. [2021-10-15 20:35:45,493 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 58 places, 102 transitions, 918 flow [2021-10-15 20:35:45,493 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-10-15 20:35:45,494 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2021-10-15 20:35:45,498 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 297 transitions. [2021-10-15 20:35:45,499 INFO L544 CegarLoopForPetriNet]: DFA transition density 0.7139423076923077 [2021-10-15 20:35:45,499 INFO L72 ComplementDD]: Start complementDD. Operand 16 states and 297 transitions. [2021-10-15 20:35:45,500 INFO L73 IsDeterministic]: Start isDeterministic. Operand 16 states and 297 transitions. [2021-10-15 20:35:45,500 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-10-15 20:35:45,500 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 16 states and 297 transitions. [2021-10-15 20:35:45,503 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 17 states, 16 states have (on average 18.5625) internal successors, (297), 16 states have internal predecessors, (297), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-15 20:35:45,507 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 17 states, 17 states have (on average 26.0) internal successors, (442), 17 states have internal predecessors, (442), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-15 20:35:45,507 INFO L81 ComplementDD]: Finished complementDD. Result has 17 states, 17 states have (on average 26.0) internal successors, (442), 17 states have internal predecessors, (442), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-15 20:35:45,508 INFO L186 Difference]: Start difference. First operand has 43 places, 40 transitions, 272 flow. Second operand 16 states and 297 transitions. [2021-10-15 20:35:45,508 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 58 places, 102 transitions, 918 flow [2021-10-15 20:35:45,519 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 57 places, 102 transitions, 917 flow, removed 0 selfloop flow, removed 1 redundant places. [2021-10-15 20:35:45,525 INFO L242 Difference]: Finished difference. Result has 66 places, 58 transitions, 589 flow [2021-10-15 20:35:45,526 INFO L317 CegarLoopForPetriNet]: {PETRI_ALPHABET=26, PETRI_DIFFERENCE_MINUEND_FLOW=271, PETRI_DIFFERENCE_MINUEND_PLACES=42, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=40, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=13, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=25, PETRI_DIFFERENCE_SUBTRAHEND_STATES=16, PETRI_FLOW=589, PETRI_PLACES=66, PETRI_TRANSITIONS=58} [2021-10-15 20:35:45,526 INFO L334 CegarLoopForPetriNet]: 15 programPoint places, 51 predicate places. [2021-10-15 20:35:45,526 INFO L470 AbstractCegarLoop]: Abstraction has has 66 places, 58 transitions, 589 flow [2021-10-15 20:35:45,526 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 15.0625) internal successors, (241), 16 states have internal predecessors, (241), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-15 20:35:45,527 INFO L246 CegarLoopForPetriNet]: Found error trace [2021-10-15 20:35:45,527 INFO L254 CegarLoopForPetriNet]: trace histogram [14, 14, 13, 13, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-15 20:35:45,544 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/mathsat -unsat_core_generation=3 (6)] Forceful destruction successful, exit code 0 [2021-10-15 20:35:45,747 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/mathsat -unsat_core_generation=3 [2021-10-15 20:35:45,747 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-15 20:35:45,748 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-15 20:35:45,748 INFO L82 PathProgramCache]: Analyzing trace with hash -960060181, now seen corresponding path program 2 times [2021-10-15 20:35:45,748 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-10-15 20:35:45,749 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [181165238] [2021-10-15 20:35:45,749 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-10-15 20:35:45,749 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-15 20:35:45,749 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/mathsat [2021-10-15 20:35:45,750 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-15 20:35:45,752 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/mathsat -unsat_core_generation=3 (7)] Waiting until timeout for monitored process [2021-10-15 20:35:45,947 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-10-15 20:35:45,948 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-15 20:35:45,955 INFO L263 TraceCheckSpWp]: Trace formula consists of 130 conjuncts, 16 conjunts are in the unsatisfiable core [2021-10-15 20:35:45,959 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-15 20:35:46,310 INFO L134 CoverageAnalysis]: Checked inductivity of 443 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 247 trivial. 0 not checked. [2021-10-15 20:35:46,310 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-15 20:35:47,304 INFO L134 CoverageAnalysis]: Checked inductivity of 443 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 247 trivial. 0 not checked. [2021-10-15 20:35:47,304 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-10-15 20:35:47,305 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [181165238] [2021-10-15 20:35:47,305 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [181165238] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-15 20:35:47,305 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-10-15 20:35:47,305 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17] total 32 [2021-10-15 20:35:47,305 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1946515471] [2021-10-15 20:35:47,306 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2021-10-15 20:35:47,306 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-10-15 20:35:47,307 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-10-15 20:35:47,307 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=286, Invalid=706, Unknown=0, NotChecked=0, Total=992 [2021-10-15 20:35:47,309 INFO L499 CegarLoopForPetriNet]: Number of universal loopers: 13 out of 26 [2021-10-15 20:35:47,309 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 66 places, 58 transitions, 589 flow. Second operand has 32 states, 32 states have (on average 15.03125) internal successors, (481), 32 states have internal predecessors, (481), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-15 20:35:47,309 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-10-15 20:35:47,310 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 13 of 26 [2021-10-15 20:35:47,310 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-10-15 20:35:50,701 INFO L129 PetriNetUnfolder]: 61/318 cut-off events. [2021-10-15 20:35:50,701 INFO L130 PetriNetUnfolder]: For 3679/3679 co-relation queries the response was YES. [2021-10-15 20:35:50,704 INFO L84 FinitePrefix]: Finished finitePrefix Result has 1710 conditions, 318 events. 61/318 cut-off events. For 3679/3679 co-relation queries the response was YES. Maximal size of possible extension queue 3. Compared 312 event pairs, 0 based on Foata normal form. 48/366 useless extension candidates. Maximal degree in co-relation 1688. Up to 114 conditions per place. [2021-10-15 20:35:50,707 INFO L132 encePairwiseOnDemand]: 18/26 looper letters, 118 selfloop transitions, 63 changer transitions 0/198 dead transitions. [2021-10-15 20:35:50,707 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 97 places, 198 transitions, 2315 flow [2021-10-15 20:35:50,707 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-10-15 20:35:50,708 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2021-10-15 20:35:50,710 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 601 transitions. [2021-10-15 20:35:50,711 INFO L544 CegarLoopForPetriNet]: DFA transition density 0.7223557692307693 [2021-10-15 20:35:50,711 INFO L72 ComplementDD]: Start complementDD. Operand 32 states and 601 transitions. [2021-10-15 20:35:50,711 INFO L73 IsDeterministic]: Start isDeterministic. Operand 32 states and 601 transitions. [2021-10-15 20:35:50,712 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-10-15 20:35:50,712 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 32 states and 601 transitions. [2021-10-15 20:35:50,714 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 33 states, 32 states have (on average 18.78125) internal successors, (601), 32 states have internal predecessors, (601), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-15 20:35:50,717 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 33 states, 33 states have (on average 26.0) internal successors, (858), 33 states have internal predecessors, (858), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-15 20:35:50,717 INFO L81 ComplementDD]: Finished complementDD. Result has 33 states, 33 states have (on average 26.0) internal successors, (858), 33 states have internal predecessors, (858), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-15 20:35:50,717 INFO L186 Difference]: Start difference. First operand has 66 places, 58 transitions, 589 flow. Second operand 32 states and 601 transitions. [2021-10-15 20:35:50,718 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 97 places, 198 transitions, 2315 flow [2021-10-15 20:35:50,735 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 92 places, 198 transitions, 2297 flow, removed 0 selfloop flow, removed 5 redundant places. [2021-10-15 20:35:50,769 INFO L242 Difference]: Finished difference. Result has 109 places, 92 transitions, 1313 flow [2021-10-15 20:35:50,769 INFO L317 CegarLoopForPetriNet]: {PETRI_ALPHABET=26, PETRI_DIFFERENCE_MINUEND_FLOW=571, PETRI_DIFFERENCE_MINUEND_PLACES=61, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=58, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=29, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=27, PETRI_DIFFERENCE_SUBTRAHEND_STATES=32, PETRI_FLOW=1313, PETRI_PLACES=109, PETRI_TRANSITIONS=92} [2021-10-15 20:35:50,769 INFO L334 CegarLoopForPetriNet]: 15 programPoint places, 94 predicate places. [2021-10-15 20:35:50,770 INFO L470 AbstractCegarLoop]: Abstraction has has 109 places, 92 transitions, 1313 flow [2021-10-15 20:35:50,770 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 15.03125) internal successors, (481), 32 states have internal predecessors, (481), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-15 20:35:50,770 INFO L246 CegarLoopForPetriNet]: Found error trace [2021-10-15 20:35:50,770 INFO L254 CegarLoopForPetriNet]: trace histogram [30, 30, 29, 29, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-15 20:35:50,786 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/mathsat -unsat_core_generation=3 (7)] Forceful destruction successful, exit code 0 [2021-10-15 20:35:50,982 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/mathsat -unsat_core_generation=3 [2021-10-15 20:35:50,983 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-15 20:35:50,986 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-15 20:35:50,987 INFO L82 PathProgramCache]: Analyzing trace with hash 1324513547, now seen corresponding path program 3 times [2021-10-15 20:35:50,991 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-10-15 20:35:50,992 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1868235169] [2021-10-15 20:35:50,993 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-10-15 20:35:50,994 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-15 20:35:50,994 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/mathsat [2021-10-15 20:35:50,997 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-15 20:35:51,013 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/mathsat -unsat_core_generation=3 (8)] Waiting until timeout for monitored process [2021-10-15 20:35:51,182 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-10-15 20:35:51,182 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-15 20:35:51,185 INFO L263 TraceCheckSpWp]: Trace formula consists of 50 conjuncts, 10 conjunts are in the unsatisfiable core [2021-10-15 20:35:51,192 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-15 20:35:53,233 INFO L354 Elim1Store]: treesize reduction 4, result has 60.0 percent of original size [2021-10-15 20:35:53,234 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 50 treesize of output 26 [2021-10-15 20:35:53,236 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-10-15 20:35:53,236 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1868235169] [2021-10-15 20:35:53,236 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_DEPENDING: no int: (_ BitVec 32) [2021-10-15 20:35:53,237 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [2034047616] [2021-10-15 20:35:53,237 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-10-15 20:35:53,237 INFO L170 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-10-15 20:35:53,237 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/cvc4 [2021-10-15 20:35:53,240 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-10-15 20:35:53,260 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/cvc4 --incremental --print-success --lang smt (9)] Waiting until timeout for monitored process [2021-10-15 20:35:53,592 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-10-15 20:35:53,592 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-15 20:35:53,594 INFO L263 TraceCheckSpWp]: Trace formula consists of 50 conjuncts, 10 conjunts are in the unsatisfiable core [2021-10-15 20:35:53,599 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-15 20:35:55,301 INFO L354 Elim1Store]: treesize reduction 4, result has 60.0 percent of original size [2021-10-15 20:35:55,301 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 50 treesize of output 26 [2021-10-15 20:35:55,302 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_DEPENDING: no int: (_ BitVec 32) [2021-10-15 20:35:55,302 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1270080867] [2021-10-15 20:35:55,302 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-10-15 20:35:55,303 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-15 20:35:55,303 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/z3 [2021-10-15 20:35:55,304 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-15 20:35:55,324 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-10-15 20:35:55,714 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-10-15 20:35:55,714 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-15 20:35:55,717 INFO L263 TraceCheckSpWp]: Trace formula consists of 50 conjuncts, 11 conjunts are in the unsatisfiable core [2021-10-15 20:35:55,721 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-15 20:35:57,404 INFO L354 Elim1Store]: treesize reduction 4, result has 60.0 percent of original size [2021-10-15 20:35:57,404 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 50 treesize of output 26 [2021-10-15 20:35:57,405 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_DEPENDING: no int: (_ BitVec 32) [2021-10-15 20:35:57,406 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 0 imperfect interpolant sequences. [2021-10-15 20:35:57,406 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [] total 0 [2021-10-15 20:35:57,406 ERROR L172 FreeRefinementEngine]: Strategy WOLF failed to provide any proof altough trace is infeasible [2021-10-15 20:35:57,406 INFO L626 BasicCegarLoop]: Counterexample might be feasible [2021-10-15 20:35:57,417 INFO L764 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION [2021-10-15 20:35:57,431 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/cvc4 --incremental --print-success --lang smt (9)] Ended with exit code 0 [2021-10-15 20:35:57,651 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-10-15 20:35:57,854 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/mathsat -unsat_core_generation=3 (8)] Forceful destruction successful, exit code 0 [2021-10-15 20:35:58,026 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/cvc4 --incremental --print-success --lang smt,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/mathsat -unsat_core_generation=3 [2021-10-15 20:35:58,045 INFO L179 ceAbstractionStarter]: Computing trace abstraction results [2021-10-15 20:35:58,097 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 15.10 08:35:58 BoogieIcfgContainer [2021-10-15 20:35:58,097 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-10-15 20:35:58,098 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2021-10-15 20:35:58,098 INFO L271 PluginConnector]: Initializing Witness Printer... [2021-10-15 20:35:58,098 INFO L275 PluginConnector]: Witness Printer initialized [2021-10-15 20:35:58,098 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 15.10 08:35:41" (3/4) ... [2021-10-15 20:35:58,101 INFO L140 WitnessPrinter]: No result that supports witness generation found [2021-10-15 20:35:58,101 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2021-10-15 20:35:58,102 INFO L168 Benchmark]: Toolchain (without parser) took 17641.19 ms. Allocated memory was 65.0 MB in the beginning and 119.5 MB in the end (delta: 54.5 MB). Free memory was 45.0 MB in the beginning and 49.7 MB in the end (delta: -4.7 MB). Peak memory consumption was 52.4 MB. Max. memory is 16.1 GB. [2021-10-15 20:35:58,103 INFO L168 Benchmark]: CDTParser took 0.12 ms. Allocated memory is still 65.0 MB. Free memory is still 46.8 MB. There was no memory consumed. Max. memory is 16.1 GB. [2021-10-15 20:35:58,103 INFO L168 Benchmark]: CACSL2BoogieTranslator took 221.74 ms. Allocated memory is still 65.0 MB. Free memory was 44.8 MB in the beginning and 34.6 MB in the end (delta: 10.2 MB). Peak memory consumption was 10.5 MB. Max. memory is 16.1 GB. [2021-10-15 20:35:58,104 INFO L168 Benchmark]: Boogie Procedure Inliner took 32.77 ms. Allocated memory is still 65.0 MB. Free memory was 34.6 MB in the beginning and 33.1 MB in the end (delta: 1.5 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2021-10-15 20:35:58,104 INFO L168 Benchmark]: Boogie Preprocessor took 26.04 ms. Allocated memory is still 65.0 MB. Free memory was 33.1 MB in the beginning and 31.9 MB in the end (delta: 1.2 MB). There was no memory consumed. Max. memory is 16.1 GB. [2021-10-15 20:35:58,105 INFO L168 Benchmark]: RCFGBuilder took 373.13 ms. Allocated memory is still 65.0 MB. Free memory was 31.9 MB in the beginning and 39.5 MB in the end (delta: -7.6 MB). Peak memory consumption was 5.4 MB. Max. memory is 16.1 GB. [2021-10-15 20:35:58,105 INFO L168 Benchmark]: TraceAbstraction took 16978.46 ms. Allocated memory was 65.0 MB in the beginning and 119.5 MB in the end (delta: 54.5 MB). Free memory was 38.8 MB in the beginning and 50.7 MB in the end (delta: -11.9 MB). Peak memory consumption was 40.7 MB. Max. memory is 16.1 GB. [2021-10-15 20:35:58,106 INFO L168 Benchmark]: Witness Printer took 3.36 ms. Allocated memory is still 119.5 MB. Free memory is still 49.7 MB. There was no memory consumed. Max. memory is 16.1 GB. [2021-10-15 20:35:58,109 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.12 ms. Allocated memory is still 65.0 MB. Free memory is still 46.8 MB. There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 221.74 ms. Allocated memory is still 65.0 MB. Free memory was 44.8 MB in the beginning and 34.6 MB in the end (delta: 10.2 MB). Peak memory consumption was 10.5 MB. Max. memory is 16.1 GB. * Boogie Procedure Inliner took 32.77 ms. Allocated memory is still 65.0 MB. Free memory was 34.6 MB in the beginning and 33.1 MB in the end (delta: 1.5 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * Boogie Preprocessor took 26.04 ms. Allocated memory is still 65.0 MB. Free memory was 33.1 MB in the beginning and 31.9 MB in the end (delta: 1.2 MB). There was no memory consumed. Max. memory is 16.1 GB. * RCFGBuilder took 373.13 ms. Allocated memory is still 65.0 MB. Free memory was 31.9 MB in the beginning and 39.5 MB in the end (delta: -7.6 MB). Peak memory consumption was 5.4 MB. Max. memory is 16.1 GB. * TraceAbstraction took 16978.46 ms. Allocated memory was 65.0 MB in the beginning and 119.5 MB in the end (delta: 54.5 MB). Free memory was 38.8 MB in the beginning and 50.7 MB in the end (delta: -11.9 MB). Peak memory consumption was 40.7 MB. Max. memory is 16.1 GB. * Witness Printer took 3.36 ms. Allocated memory is still 119.5 MB. Free memory is still 49.7 MB. There was no memory consumed. Max. memory is 16.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - StatisticsResult: ErrorAutomatonStatistics NumberErrorTraces: 0, NumberStatementsAllTraces: 0, NumberRelevantStatements: 0, 0.0ms ErrorAutomatonConstructionTimeTotal, 0.0ms FaulLocalizationTime, NumberStatementsFirstTrace: -1, TraceLengthAvg: 0, 0.0ms ErrorAutomatonConstructionTimeAvg, 0.0ms ErrorAutomatonDifferenceTimeAvg, 0.0ms ErrorAutomatonDifferenceTimeTotal, NumberOfNoEnhancement: 0, NumberOfFiniteEnhancement: 0, NumberOfInfiniteEnhancement: 0 - UnprovableResult [Line: 13]: Unable to prove that call to reach_error is unreachable Unable to prove that call to reach_error is unreachable Reason: unable to decide satisfiability of path constraint. Possible FailurePath: [L17] int array[100000]; [L18] int i; [L20] i = 0 [L20] COND TRUE i < 100000 [L22] array[i] = __VERIFIER_nondet_int() [L20] i++ [L20] COND TRUE i < 100000 [L22] array[i] = __VERIFIER_nondet_int() [L20] i++ [L20] COND TRUE i < 100000 [L22] array[i] = __VERIFIER_nondet_int() [L20] i++ [L20] COND TRUE i < 100000 [L22] array[i] = __VERIFIER_nondet_int() [L20] i++ [L20] COND TRUE i < 100000 [L22] array[i] = __VERIFIER_nondet_int() [L20] i++ [L20] COND TRUE i < 100000 [L22] array[i] = __VERIFIER_nondet_int() [L20] i++ [L20] COND TRUE i < 100000 [L22] array[i] = __VERIFIER_nondet_int() [L20] i++ [L20] COND TRUE i < 100000 [L22] array[i] = __VERIFIER_nondet_int() [L20] i++ [L20] COND TRUE i < 100000 [L22] array[i] = __VERIFIER_nondet_int() [L20] i++ [L20] COND TRUE i < 100000 [L22] array[i] = __VERIFIER_nondet_int() [L20] i++ [L20] COND TRUE i < 100000 [L22] array[i] = __VERIFIER_nondet_int() [L20] i++ [L20] COND TRUE i < 100000 [L22] array[i] = __VERIFIER_nondet_int() [L20] i++ [L20] COND TRUE i < 100000 [L22] array[i] = __VERIFIER_nondet_int() [L20] i++ [L20] COND TRUE i < 100000 [L22] array[i] = __VERIFIER_nondet_int() [L20] i++ [L20] COND TRUE i < 100000 [L22] array[i] = __VERIFIER_nondet_int() [L20] i++ [L20] COND TRUE i < 100000 [L22] array[i] = __VERIFIER_nondet_int() [L20] i++ [L20] COND TRUE i < 100000 [L22] array[i] = __VERIFIER_nondet_int() [L20] i++ [L20] COND TRUE i < 100000 [L22] array[i] = __VERIFIER_nondet_int() [L20] i++ [L20] COND TRUE i < 100000 [L22] array[i] = __VERIFIER_nondet_int() [L20] i++ [L20] COND TRUE i < 100000 [L22] array[i] = __VERIFIER_nondet_int() [L20] i++ [L20] COND TRUE i < 100000 [L22] array[i] = __VERIFIER_nondet_int() [L20] i++ [L20] COND TRUE i < 100000 [L22] array[i] = __VERIFIER_nondet_int() [L20] i++ [L20] COND TRUE i < 100000 [L22] array[i] = __VERIFIER_nondet_int() [L20] i++ [L20] COND TRUE i < 100000 [L22] array[i] = __VERIFIER_nondet_int() [L20] i++ [L20] COND TRUE i < 100000 [L22] array[i] = __VERIFIER_nondet_int() [L20] i++ [L20] COND TRUE i < 100000 [L22] array[i] = __VERIFIER_nondet_int() [L20] i++ [L20] COND TRUE i < 100000 [L22] array[i] = __VERIFIER_nondet_int() [L20] i++ [L20] COND TRUE i < 100000 [L22] array[i] = __VERIFIER_nondet_int() [L20] i++ [L20] COND TRUE i < 100000 [L22] array[i] = __VERIFIER_nondet_int() [L20] i++ [L20] COND TRUE i < 100000 [L22] array[i] = __VERIFIER_nondet_int() [L20] i++ [L20] COND FALSE !(i < 100000) [L25] EXPR array[0] [L25] int largest = array[0]; [L26] i = 1 [L26] COND TRUE i < 100000 [L28] EXPR array[i] [L28] COND TRUE largest < array[i] [L29] EXPR array[i] [L29] largest = array[i] [L26] i++ [L26] COND TRUE i < 100000 [L28] EXPR array[i] [L28] COND FALSE !(largest < array[i]) [L26] i++ [L26] COND TRUE i < 100000 [L28] EXPR array[i] [L28] COND FALSE !(largest < array[i]) [L26] i++ [L26] COND TRUE i < 100000 [L28] EXPR array[i] [L28] COND FALSE !(largest < array[i]) [L26] i++ [L26] COND TRUE i < 100000 [L28] EXPR array[i] [L28] COND FALSE !(largest < array[i]) [L26] i++ [L26] COND TRUE i < 100000 [L28] EXPR array[i] [L28] COND FALSE !(largest < array[i]) [L26] i++ [L26] COND TRUE i < 100000 [L28] EXPR array[i] [L28] COND FALSE !(largest < array[i]) [L26] i++ [L26] COND TRUE i < 100000 [L28] EXPR array[i] [L28] COND FALSE !(largest < array[i]) [L26] i++ [L26] COND TRUE i < 100000 [L28] EXPR array[i] [L28] COND FALSE !(largest < array[i]) [L26] i++ [L26] COND TRUE i < 100000 [L28] EXPR array[i] [L28] COND FALSE !(largest < array[i]) [L26] i++ [L26] COND TRUE i < 100000 [L28] EXPR array[i] [L28] COND FALSE !(largest < array[i]) [L26] i++ [L26] COND TRUE i < 100000 [L28] EXPR array[i] [L28] COND FALSE !(largest < array[i]) [L26] i++ [L26] COND TRUE i < 100000 [L28] EXPR array[i] [L28] COND FALSE !(largest < array[i]) [L26] i++ [L26] COND TRUE i < 100000 [L28] EXPR array[i] [L28] COND FALSE !(largest < array[i]) [L26] i++ [L26] COND TRUE i < 100000 [L28] EXPR array[i] [L28] COND FALSE !(largest < array[i]) [L26] i++ [L26] COND TRUE i < 100000 [L28] EXPR array[i] [L28] COND FALSE !(largest < array[i]) [L26] i++ [L26] COND TRUE i < 100000 [L28] EXPR array[i] [L28] COND FALSE !(largest < array[i]) [L26] i++ [L26] COND TRUE i < 100000 [L28] EXPR array[i] [L28] COND FALSE !(largest < array[i]) [L26] i++ [L26] COND TRUE i < 100000 [L28] EXPR array[i] [L28] COND FALSE !(largest < array[i]) [L26] i++ [L26] COND TRUE i < 100000 [L28] EXPR array[i] [L28] COND FALSE !(largest < array[i]) [L26] i++ [L26] COND TRUE i < 100000 [L28] EXPR array[i] [L28] COND FALSE !(largest < array[i]) [L26] i++ [L26] COND TRUE i < 100000 [L28] EXPR array[i] [L28] COND FALSE !(largest < array[i]) [L26] i++ [L26] COND TRUE i < 100000 [L28] EXPR array[i] [L28] COND FALSE !(largest < array[i]) [L26] i++ [L26] COND TRUE i < 100000 [L28] EXPR array[i] [L28] COND FALSE !(largest < array[i]) [L26] i++ [L26] COND TRUE i < 100000 [L28] EXPR array[i] [L28] COND FALSE !(largest < array[i]) [L26] i++ [L26] COND TRUE i < 100000 [L28] EXPR array[i] [L28] COND FALSE !(largest < array[i]) [L26] i++ [L26] COND TRUE i < 100000 [L28] EXPR array[i] [L28] COND FALSE !(largest < array[i]) [L26] i++ [L26] COND TRUE i < 100000 [L28] EXPR array[i] [L28] COND FALSE !(largest < array[i]) [L26] i++ [L26] COND TRUE i < 100000 [L28] EXPR array[i] [L28] COND FALSE !(largest < array[i]) [L26] i++ [L26] COND FALSE !(i < 100000) [L31] int x; [L32] x = 0 [L32] COND TRUE x < 100000 [L33] array[ x ] [L13] COND TRUE !(cond) [L13] reach_error() - StatisticsResult: Ultimate Automizer benchmark data CFG has 1 procedures, 19 locations, 1 error locations. Started 1 CEGAR loops. EmptinessCheckTime: 4.1ms, RemoveRedundantFlowTime: 0.0ms, RemoveRedundantFlowUnfoldingTime: 0.0ms, BackfoldingTime: 0.0ms, BackfoldingUnfoldingTime: 0.0ms, FlowIncreaseByBackfolding: 0, BasicCegarLoop: OverallTime: 16866.1ms, OverallIterations: 7, TraceHistogramMax: 30, EmptinessCheckTime: 0.0ms, AutomataDifference: 5004.9ms, DeadEndRemovalTime: 0.0ms, HoareAnnotationTime: 0.0ms, InitialAbstractionConstructionTime: 35.3ms, PartialOrderReductionTime: 0.0ms, HoareTripleCheckerStatistics: 21 SDtfs, 719 SDslu, 20 SDs, 0 SdLazy, 1627 SolverSat, 414 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 1905.2ms Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 378 GetRequests, 293 SyntacticMatches, 0 SemanticMatches, 85 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 123 ImplicationChecksByTransitivity, 3405.5ms Time, 0.0ms BasicInterpolantAutomatonTime, BiggestAbstraction: size=1313occurred in iteration=6, InterpolantAutomatonStates: 71, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0ms DumpTime, AutomataMinimizationStatistics: No data available, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 61.3ms SsaConstructionTime, 206.0ms SatisfiabilityAnalysisTime, 2727.3ms InterpolantComputationTime, 182 NumberOfCodeBlocks, 155 NumberOfCodeBlocksAsserted, 7 NumberOfCheckSat, 352 ConstructedInterpolants, 0 QuantifiedInterpolants, 960 SizeOfPredicates, 13 NumberOfNonLiveVariables, 354 ConjunctsInSsa, 38 ConjunctsInUnsatCore, 12 InterpolantComputations, 6 PerfectInterpolantSequences, 708/1180 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate could not prove your program: unable to determine feasibility of some traces [2021-10-15 20:35:58,149 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_28b2a707-531d-4545-9a8d-a8cb4aa35789/bin/uautomizer-hJ6jxDFKc3/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Forceful destruction successful, exit code 0 Received shutdown request...