./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/list-simple/dll2n_update_all.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_6733bad1-7ac1-4a5e-9834-1e392b9d29c2/bin/uautomizer-hJ6jxDFKc3/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6733bad1-7ac1-4a5e-9834-1e392b9d29c2/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_6733bad1-7ac1-4a5e-9834-1e392b9d29c2/bin/uautomizer-hJ6jxDFKc3/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6733bad1-7ac1-4a5e-9834-1e392b9d29c2/bin/uautomizer-hJ6jxDFKc3/config/AutomizerReach.xml -i ../../sv-benchmarks/c/list-simple/dll2n_update_all.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6733bad1-7ac1-4a5e-9834-1e392b9d29c2/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_6733bad1-7ac1-4a5e-9834-1e392b9d29c2/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 ff1c7523090f73a9df023efb85afad63615b4167 ................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ Execution finished normally Writing output log to file Ultimate.log Result: TRUE --- Real Ultimate output --- This is Ultimate 0.2.1-dev-5709675 [2021-10-15 20:10:14,329 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-10-15 20:10:14,331 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-10-15 20:10:14,381 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-10-15 20:10:14,382 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-10-15 20:10:14,387 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-10-15 20:10:14,389 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-10-15 20:10:14,394 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-10-15 20:10:14,396 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-10-15 20:10:14,404 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-10-15 20:10:14,405 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-10-15 20:10:14,408 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-10-15 20:10:14,408 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-10-15 20:10:14,411 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-10-15 20:10:14,415 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-10-15 20:10:14,421 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-10-15 20:10:14,423 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-10-15 20:10:14,425 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-10-15 20:10:14,427 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-10-15 20:10:14,438 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-10-15 20:10:14,440 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-10-15 20:10:14,441 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-10-15 20:10:14,445 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-10-15 20:10:14,446 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-10-15 20:10:14,450 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-10-15 20:10:14,451 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-10-15 20:10:14,451 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-10-15 20:10:14,453 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-10-15 20:10:14,454 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-10-15 20:10:14,456 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-10-15 20:10:14,457 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-10-15 20:10:14,458 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-10-15 20:10:14,460 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-10-15 20:10:14,462 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-10-15 20:10:14,464 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-10-15 20:10:14,464 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-10-15 20:10:14,465 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-10-15 20:10:14,465 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-10-15 20:10:14,466 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-10-15 20:10:14,467 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-10-15 20:10:14,467 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-10-15 20:10:14,468 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6733bad1-7ac1-4a5e-9834-1e392b9d29c2/bin/uautomizer-hJ6jxDFKc3/config/svcomp-Reach-32bit-Automizer_Default.epf [2021-10-15 20:10:14,526 INFO L113 SettingsManager]: Loading preferences was successful [2021-10-15 20:10:14,527 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-10-15 20:10:14,528 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-10-15 20:10:14,528 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-10-15 20:10:14,529 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-10-15 20:10:14,530 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-10-15 20:10:14,530 INFO L138 SettingsManager]: * Use SBE=true [2021-10-15 20:10:14,531 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-10-15 20:10:14,531 INFO L138 SettingsManager]: * sizeof long=4 [2021-10-15 20:10:14,531 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-10-15 20:10:14,532 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-10-15 20:10:14,533 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-10-15 20:10:14,533 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-10-15 20:10:14,533 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-10-15 20:10:14,533 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-10-15 20:10:14,534 INFO L138 SettingsManager]: * sizeof long double=12 [2021-10-15 20:10:14,534 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-10-15 20:10:14,534 INFO L138 SettingsManager]: * Use constant arrays=true [2021-10-15 20:10:14,534 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-10-15 20:10:14,535 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-10-15 20:10:14,535 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-10-15 20:10:14,535 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-10-15 20:10:14,535 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-10-15 20:10:14,536 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-10-15 20:10:14,536 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-10-15 20:10:14,536 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-10-15 20:10:14,536 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-10-15 20:10:14,537 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-10-15 20:10:14,537 INFO L138 SettingsManager]: * Large block encoding in concurrent analysis=OFF [2021-10-15 20:10:14,539 INFO L138 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2021-10-15 20:10:14,539 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-10-15 20:10:14,539 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-10-15 20:10:14,540 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_6733bad1-7ac1-4a5e-9834-1e392b9d29c2/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6733bad1-7ac1-4a5e-9834-1e392b9d29c2/bin/uautomizer-hJ6jxDFKc3 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> ff1c7523090f73a9df023efb85afad63615b4167 [2021-10-15 20:10:14,843 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-10-15 20:10:14,875 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-10-15 20:10:14,878 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-10-15 20:10:14,879 INFO L271 PluginConnector]: Initializing CDTParser... [2021-10-15 20:10:14,880 INFO L275 PluginConnector]: CDTParser initialized [2021-10-15 20:10:14,908 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6733bad1-7ac1-4a5e-9834-1e392b9d29c2/bin/uautomizer-hJ6jxDFKc3/../../sv-benchmarks/c/list-simple/dll2n_update_all.i [2021-10-15 20:10:15,000 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6733bad1-7ac1-4a5e-9834-1e392b9d29c2/bin/uautomizer-hJ6jxDFKc3/data/b26a2f060/7f9d2efa084d451ebb85af6d2d840225/FLAGa7e10da6f [2021-10-15 20:10:15,518 INFO L306 CDTParser]: Found 1 translation units. [2021-10-15 20:10:15,519 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6733bad1-7ac1-4a5e-9834-1e392b9d29c2/sv-benchmarks/c/list-simple/dll2n_update_all.i [2021-10-15 20:10:15,538 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6733bad1-7ac1-4a5e-9834-1e392b9d29c2/bin/uautomizer-hJ6jxDFKc3/data/b26a2f060/7f9d2efa084d451ebb85af6d2d840225/FLAGa7e10da6f [2021-10-15 20:10:15,815 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6733bad1-7ac1-4a5e-9834-1e392b9d29c2/bin/uautomizer-hJ6jxDFKc3/data/b26a2f060/7f9d2efa084d451ebb85af6d2d840225 [2021-10-15 20:10:15,818 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-10-15 20:10:15,819 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-10-15 20:10:15,821 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-10-15 20:10:15,821 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-10-15 20:10:15,826 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-10-15 20:10:15,827 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 15.10 08:10:15" (1/1) ... [2021-10-15 20:10:15,828 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@763fdd8f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 08:10:15, skipping insertion in model container [2021-10-15 20:10:15,828 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 15.10 08:10:15" (1/1) ... [2021-10-15 20:10:15,837 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-10-15 20:10:15,903 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-10-15 20:10:16,296 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_6733bad1-7ac1-4a5e-9834-1e392b9d29c2/sv-benchmarks/c/list-simple/dll2n_update_all.i[24455,24468] [2021-10-15 20:10:16,308 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-10-15 20:10:16,322 INFO L203 MainTranslator]: Completed pre-run [2021-10-15 20:10:16,377 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_6733bad1-7ac1-4a5e-9834-1e392b9d29c2/sv-benchmarks/c/list-simple/dll2n_update_all.i[24455,24468] [2021-10-15 20:10:16,378 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-10-15 20:10:16,413 INFO L208 MainTranslator]: Completed translation [2021-10-15 20:10:16,413 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 08:10:16 WrapperNode [2021-10-15 20:10:16,414 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-10-15 20:10:16,415 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-10-15 20:10:16,415 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-10-15 20:10:16,415 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-10-15 20:10:16,427 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 08:10:16" (1/1) ... [2021-10-15 20:10:16,448 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 08:10:16" (1/1) ... [2021-10-15 20:10:16,476 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-10-15 20:10:16,477 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-10-15 20:10:16,477 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-10-15 20:10:16,477 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-10-15 20:10:16,487 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 08:10:16" (1/1) ... [2021-10-15 20:10:16,487 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 08:10:16" (1/1) ... [2021-10-15 20:10:16,492 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 08:10:16" (1/1) ... [2021-10-15 20:10:16,492 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 08:10:16" (1/1) ... [2021-10-15 20:10:16,501 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 08:10:16" (1/1) ... [2021-10-15 20:10:16,507 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 08:10:16" (1/1) ... [2021-10-15 20:10:16,509 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 08:10:16" (1/1) ... [2021-10-15 20:10:16,520 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-10-15 20:10:16,520 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-10-15 20:10:16,521 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-10-15 20:10:16,521 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-10-15 20:10:16,530 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 08:10:16" (1/1) ... [2021-10-15 20:10:16,539 INFO L170 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-10-15 20:10:16,552 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6733bad1-7ac1-4a5e-9834-1e392b9d29c2/bin/uautomizer-hJ6jxDFKc3/z3 [2021-10-15 20:10:16,571 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6733bad1-7ac1-4a5e-9834-1e392b9d29c2/bin/uautomizer-hJ6jxDFKc3/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-10-15 20:10:16,601 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6733bad1-7ac1-4a5e-9834-1e392b9d29c2/bin/uautomizer-hJ6jxDFKc3/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-10-15 20:10:16,641 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-10-15 20:10:16,641 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-10-15 20:10:16,641 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2021-10-15 20:10:16,641 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2021-10-15 20:10:16,642 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-10-15 20:10:16,642 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2021-10-15 20:10:16,642 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-10-15 20:10:16,642 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-10-15 20:10:16,642 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-10-15 20:10:16,642 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-10-15 20:10:17,070 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-10-15 20:10:17,070 INFO L299 CfgBuilder]: Removed 20 assume(true) statements. [2021-10-15 20:10:17,073 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 15.10 08:10:17 BoogieIcfgContainer [2021-10-15 20:10:17,073 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-10-15 20:10:17,075 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-10-15 20:10:17,075 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-10-15 20:10:17,079 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-10-15 20:10:17,079 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 15.10 08:10:15" (1/3) ... [2021-10-15 20:10:17,080 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6c04b84a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 15.10 08:10:17, skipping insertion in model container [2021-10-15 20:10:17,080 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 08:10:16" (2/3) ... [2021-10-15 20:10:17,081 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6c04b84a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 15.10 08:10:17, skipping insertion in model container [2021-10-15 20:10:17,081 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 15.10 08:10:17" (3/3) ... [2021-10-15 20:10:17,082 INFO L111 eAbstractionObserver]: Analyzing ICFG dll2n_update_all.i [2021-10-15 20:10:17,088 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-10-15 20:10:17,088 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-10-15 20:10:17,144 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-10-15 20:10:17,151 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 20:10:17,151 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-10-15 20:10:17,163 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 29 places, 43 transitions, 86 flow [2021-10-15 20:10:17,190 INFO L129 PetriNetUnfolder]: 15/43 cut-off events. [2021-10-15 20:10:17,190 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-10-15 20:10:17,192 INFO L84 FinitePrefix]: Finished finitePrefix Result has 44 conditions, 43 events. 15/43 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 3. Compared 51 event pairs, 0 based on Foata normal form. 0/27 useless extension candidates. Maximal degree in co-relation 0. Up to 2 conditions per place. [2021-10-15 20:10:17,193 INFO L82 GeneralOperation]: Start removeDead. Operand has 29 places, 43 transitions, 86 flow [2021-10-15 20:10:17,198 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 22 places, 31 transitions, 62 flow [2021-10-15 20:10:17,204 INFO L129 PetriNetUnfolder]: 10/30 cut-off events. [2021-10-15 20:10:17,205 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-10-15 20:10:17,205 INFO L246 CegarLoopForPetriNet]: Found error trace [2021-10-15 20:10:17,206 INFO L254 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-15 20:10:17,206 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-15 20:10:17,212 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-15 20:10:17,213 INFO L82 PathProgramCache]: Analyzing trace with hash -1111552470, now seen corresponding path program 1 times [2021-10-15 20:10:17,227 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-15 20:10:17,227 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [405789480] [2021-10-15 20:10:17,228 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-15 20:10:17,234 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-15 20:10:17,361 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-15 20:10:17,443 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 20:10:17,444 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-15 20:10:17,445 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [405789480] [2021-10-15 20:10:17,446 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [405789480] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-15 20:10:17,446 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-15 20:10:17,447 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-10-15 20:10:17,449 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [640126270] [2021-10-15 20:10:17,462 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2021-10-15 20:10:17,465 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-15 20:10:17,477 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-10-15 20:10:17,479 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-10-15 20:10:17,482 INFO L499 CegarLoopForPetriNet]: Number of universal loopers: 36 out of 43 [2021-10-15 20:10:17,488 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 22 places, 31 transitions, 62 flow. Second operand has 2 states, 2 states have (on average 36.5) internal successors, (73), 2 states have internal predecessors, (73), 0 states have call successors, (0), 0 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 20:10:17,488 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-10-15 20:10:17,488 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 36 of 43 [2021-10-15 20:10:17,489 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-10-15 20:10:17,499 INFO L129 PetriNetUnfolder]: 6/27 cut-off events. [2021-10-15 20:10:17,499 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-10-15 20:10:17,500 INFO L84 FinitePrefix]: Finished finitePrefix Result has 29 conditions, 27 events. 6/27 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 3. Compared 25 event pairs, 0 based on Foata normal form. 4/25 useless extension candidates. Maximal degree in co-relation 27. Up to 2 conditions per place. [2021-10-15 20:10:17,502 INFO L132 encePairwiseOnDemand]: 39/43 looper letters, 0 selfloop transitions, 0 changer transitions 0/27 dead transitions. [2021-10-15 20:10:17,502 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 23 places, 27 transitions, 54 flow [2021-10-15 20:10:17,502 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-10-15 20:10:17,505 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2 states. [2021-10-15 20:10:17,511 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2 states to 2 states and 76 transitions. [2021-10-15 20:10:17,513 INFO L544 CegarLoopForPetriNet]: DFA transition density 0.8837209302325582 [2021-10-15 20:10:17,514 INFO L72 ComplementDD]: Start complementDD. Operand 2 states and 76 transitions. [2021-10-15 20:10:17,515 INFO L73 IsDeterministic]: Start isDeterministic. Operand 2 states and 76 transitions. [2021-10-15 20:10:17,516 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-10-15 20:10:17,519 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 2 states and 76 transitions. [2021-10-15 20:10:17,522 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 3 states, 2 states have (on average 38.0) internal successors, (76), 2 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 20:10:17,527 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 3 states, 3 states have (on average 43.0) internal successors, (129), 3 states have internal predecessors, (129), 0 states have call successors, (0), 0 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 20:10:17,528 INFO L81 ComplementDD]: Finished complementDD. Result has 3 states, 3 states have (on average 43.0) internal successors, (129), 3 states have internal predecessors, (129), 0 states have call successors, (0), 0 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 20:10:17,530 INFO L186 Difference]: Start difference. First operand has 22 places, 31 transitions, 62 flow. Second operand 2 states and 76 transitions. [2021-10-15 20:10:17,532 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 23 places, 27 transitions, 54 flow [2021-10-15 20:10:17,534 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 23 places, 27 transitions, 54 flow, removed 0 selfloop flow, removed 0 redundant places. [2021-10-15 20:10:17,536 INFO L242 Difference]: Finished difference. Result has 23 places, 27 transitions, 54 flow [2021-10-15 20:10:17,539 INFO L317 CegarLoopForPetriNet]: {PETRI_ALPHABET=43, PETRI_DIFFERENCE_MINUEND_FLOW=54, PETRI_DIFFERENCE_MINUEND_PLACES=22, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=27, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=0, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=27, PETRI_DIFFERENCE_SUBTRAHEND_STATES=2, PETRI_FLOW=54, PETRI_PLACES=23, PETRI_TRANSITIONS=27} [2021-10-15 20:10:17,540 INFO L334 CegarLoopForPetriNet]: 22 programPoint places, 1 predicate places. [2021-10-15 20:10:17,540 INFO L470 AbstractCegarLoop]: Abstraction has has 23 places, 27 transitions, 54 flow [2021-10-15 20:10:17,540 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 36.5) internal successors, (73), 2 states have internal predecessors, (73), 0 states have call successors, (0), 0 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 20:10:17,540 INFO L246 CegarLoopForPetriNet]: Found error trace [2021-10-15 20:10:17,541 INFO L254 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-15 20:10:17,541 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-10-15 20:10:17,541 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-15 20:10:17,542 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-15 20:10:17,542 INFO L82 PathProgramCache]: Analyzing trace with hash -1608020802, now seen corresponding path program 1 times [2021-10-15 20:10:17,542 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-15 20:10:17,543 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1555773128] [2021-10-15 20:10:17,543 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-15 20:10:17,543 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-15 20:10:17,578 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-15 20:10:17,648 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 20:10:17,649 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-15 20:10:17,649 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1555773128] [2021-10-15 20:10:17,650 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1555773128] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-15 20:10:17,650 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-15 20:10:17,650 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-10-15 20:10:17,650 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2143117152] [2021-10-15 20:10:17,652 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-10-15 20:10:17,652 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-15 20:10:17,655 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-10-15 20:10:17,655 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-10-15 20:10:17,657 INFO L499 CegarLoopForPetriNet]: Number of universal loopers: 32 out of 43 [2021-10-15 20:10:17,658 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 23 places, 27 transitions, 54 flow. Second operand has 3 states, 3 states have (on average 32.666666666666664) internal successors, (98), 3 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 20:10:17,658 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-10-15 20:10:17,658 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 32 of 43 [2021-10-15 20:10:17,658 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-10-15 20:10:17,681 INFO L129 PetriNetUnfolder]: 7/33 cut-off events. [2021-10-15 20:10:17,682 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-10-15 20:10:17,682 INFO L84 FinitePrefix]: Finished finitePrefix Result has 42 conditions, 33 events. 7/33 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 3. Compared 23 event pairs, 0 based on Foata normal form. 0/26 useless extension candidates. Maximal degree in co-relation 39. Up to 5 conditions per place. [2021-10-15 20:10:17,683 INFO L132 encePairwiseOnDemand]: 40/43 looper letters, 4 selfloop transitions, 2 changer transitions 0/29 dead transitions. [2021-10-15 20:10:17,683 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 25 places, 29 transitions, 70 flow [2021-10-15 20:10:17,683 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-10-15 20:10:17,683 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2021-10-15 20:10:17,685 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 103 transitions. [2021-10-15 20:10:17,685 INFO L544 CegarLoopForPetriNet]: DFA transition density 0.7984496124031008 [2021-10-15 20:10:17,686 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 103 transitions. [2021-10-15 20:10:17,686 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 103 transitions. [2021-10-15 20:10:17,686 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-10-15 20:10:17,686 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 103 transitions. [2021-10-15 20:10:17,688 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 34.333333333333336) internal successors, (103), 3 states have internal predecessors, (103), 0 states have call successors, (0), 0 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 20:10:17,690 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 43.0) internal successors, (172), 4 states have internal predecessors, (172), 0 states have call successors, (0), 0 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 20:10:17,690 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 43.0) internal successors, (172), 4 states have internal predecessors, (172), 0 states have call successors, (0), 0 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 20:10:17,690 INFO L186 Difference]: Start difference. First operand has 23 places, 27 transitions, 54 flow. Second operand 3 states and 103 transitions. [2021-10-15 20:10:17,690 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 25 places, 29 transitions, 70 flow [2021-10-15 20:10:17,691 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 25 places, 29 transitions, 70 flow, removed 0 selfloop flow, removed 0 redundant places. [2021-10-15 20:10:17,693 INFO L242 Difference]: Finished difference. Result has 26 places, 28 transitions, 66 flow [2021-10-15 20:10:17,693 INFO L317 CegarLoopForPetriNet]: {PETRI_ALPHABET=43, PETRI_DIFFERENCE_MINUEND_FLOW=54, PETRI_DIFFERENCE_MINUEND_PLACES=23, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=27, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=25, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=66, PETRI_PLACES=26, PETRI_TRANSITIONS=28} [2021-10-15 20:10:17,694 INFO L334 CegarLoopForPetriNet]: 22 programPoint places, 4 predicate places. [2021-10-15 20:10:17,694 INFO L470 AbstractCegarLoop]: Abstraction has has 26 places, 28 transitions, 66 flow [2021-10-15 20:10:17,695 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 32.666666666666664) internal successors, (98), 3 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 20:10:17,695 INFO L246 CegarLoopForPetriNet]: Found error trace [2021-10-15 20:10:17,695 INFO L254 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-15 20:10:17,695 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-10-15 20:10:17,696 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-15 20:10:17,696 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-15 20:10:17,697 INFO L82 PathProgramCache]: Analyzing trace with hash -1367045227, now seen corresponding path program 1 times [2021-10-15 20:10:17,697 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-15 20:10:17,697 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1320154036] [2021-10-15 20:10:17,697 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-15 20:10:17,698 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-15 20:10:17,729 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-15 20:10:17,775 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 20:10:17,776 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-15 20:10:17,776 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1320154036] [2021-10-15 20:10:17,776 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1320154036] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-15 20:10:17,777 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [133980646] [2021-10-15 20:10:17,777 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-15 20:10:17,777 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-15 20:10:17,778 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6733bad1-7ac1-4a5e-9834-1e392b9d29c2/bin/uautomizer-hJ6jxDFKc3/z3 [2021-10-15 20:10:17,779 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6733bad1-7ac1-4a5e-9834-1e392b9d29c2/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-15 20:10:17,786 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6733bad1-7ac1-4a5e-9834-1e392b9d29c2/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-10-15 20:10:17,894 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-15 20:10:17,896 INFO L263 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 5 conjunts are in the unsatisfiable core [2021-10-15 20:10:17,920 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-15 20:10:18,030 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 20:10:18,030 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [133980646] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-15 20:10:18,031 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-10-15 20:10:18,031 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 5 [2021-10-15 20:10:18,031 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1126112880] [2021-10-15 20:10:18,032 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-10-15 20:10:18,032 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-15 20:10:18,033 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-10-15 20:10:18,033 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2021-10-15 20:10:18,034 INFO L499 CegarLoopForPetriNet]: Number of universal loopers: 32 out of 43 [2021-10-15 20:10:18,034 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 26 places, 28 transitions, 66 flow. Second operand has 5 states, 5 states have (on average 33.4) internal successors, (167), 5 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 20:10:18,035 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-10-15 20:10:18,035 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 32 of 43 [2021-10-15 20:10:18,035 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-10-15 20:10:18,059 INFO L129 PetriNetUnfolder]: 7/34 cut-off events. [2021-10-15 20:10:18,059 INFO L130 PetriNetUnfolder]: For 5/5 co-relation queries the response was YES. [2021-10-15 20:10:18,060 INFO L84 FinitePrefix]: Finished finitePrefix Result has 51 conditions, 34 events. 7/34 cut-off events. For 5/5 co-relation queries the response was YES. Maximal size of possible extension queue 2. Compared 15 event pairs, 0 based on Foata normal form. 1/29 useless extension candidates. Maximal degree in co-relation 46. Up to 4 conditions per place. [2021-10-15 20:10:18,060 INFO L132 encePairwiseOnDemand]: 39/43 looper letters, 3 selfloop transitions, 4 changer transitions 0/30 dead transitions. [2021-10-15 20:10:18,060 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 29 places, 30 transitions, 84 flow [2021-10-15 20:10:18,061 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-10-15 20:10:18,061 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4 states. [2021-10-15 20:10:18,062 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4 states to 4 states and 136 transitions. [2021-10-15 20:10:18,063 INFO L544 CegarLoopForPetriNet]: DFA transition density 0.7906976744186046 [2021-10-15 20:10:18,063 INFO L72 ComplementDD]: Start complementDD. Operand 4 states and 136 transitions. [2021-10-15 20:10:18,063 INFO L73 IsDeterministic]: Start isDeterministic. Operand 4 states and 136 transitions. [2021-10-15 20:10:18,064 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-10-15 20:10:18,064 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 4 states and 136 transitions. [2021-10-15 20:10:18,065 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 5 states, 4 states have (on average 34.0) internal successors, (136), 4 states have internal predecessors, (136), 0 states have call successors, (0), 0 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 20:10:18,067 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 5 states, 5 states have (on average 43.0) internal successors, (215), 5 states have internal predecessors, (215), 0 states have call successors, (0), 0 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 20:10:18,068 INFO L81 ComplementDD]: Finished complementDD. Result has 5 states, 5 states have (on average 43.0) internal successors, (215), 5 states have internal predecessors, (215), 0 states have call successors, (0), 0 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 20:10:18,068 INFO L186 Difference]: Start difference. First operand has 26 places, 28 transitions, 66 flow. Second operand 4 states and 136 transitions. [2021-10-15 20:10:18,068 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 29 places, 30 transitions, 84 flow [2021-10-15 20:10:18,069 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 28 places, 30 transitions, 82 flow, removed 0 selfloop flow, removed 1 redundant places. [2021-10-15 20:10:18,071 INFO L242 Difference]: Finished difference. Result has 30 places, 29 transitions, 84 flow [2021-10-15 20:10:18,071 INFO L317 CegarLoopForPetriNet]: {PETRI_ALPHABET=43, PETRI_DIFFERENCE_MINUEND_FLOW=64, PETRI_DIFFERENCE_MINUEND_PLACES=25, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=28, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=3, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=24, PETRI_DIFFERENCE_SUBTRAHEND_STATES=4, PETRI_FLOW=84, PETRI_PLACES=30, PETRI_TRANSITIONS=29} [2021-10-15 20:10:18,071 INFO L334 CegarLoopForPetriNet]: 22 programPoint places, 8 predicate places. [2021-10-15 20:10:18,071 INFO L470 AbstractCegarLoop]: Abstraction has has 30 places, 29 transitions, 84 flow [2021-10-15 20:10:18,072 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 33.4) internal successors, (167), 5 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 20:10:18,072 INFO L246 CegarLoopForPetriNet]: Found error trace [2021-10-15 20:10:18,072 INFO L254 CegarLoopForPetriNet]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-15 20:10:18,107 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6733bad1-7ac1-4a5e-9834-1e392b9d29c2/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-10-15 20:10:18,297 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6733bad1-7ac1-4a5e-9834-1e392b9d29c2/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-15 20:10:18,297 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-15 20:10:18,298 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-15 20:10:18,298 INFO L82 PathProgramCache]: Analyzing trace with hash 393755422, now seen corresponding path program 2 times [2021-10-15 20:10:18,298 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-15 20:10:18,299 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1278581351] [2021-10-15 20:10:18,299 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-15 20:10:18,299 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-15 20:10:18,336 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-15 20:10:18,401 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 4 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-15 20:10:18,402 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-15 20:10:18,405 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1278581351] [2021-10-15 20:10:18,406 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1278581351] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-15 20:10:18,406 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [464980174] [2021-10-15 20:10:18,407 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-10-15 20:10:18,407 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-15 20:10:18,407 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6733bad1-7ac1-4a5e-9834-1e392b9d29c2/bin/uautomizer-hJ6jxDFKc3/z3 [2021-10-15 20:10:18,420 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6733bad1-7ac1-4a5e-9834-1e392b9d29c2/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-15 20:10:18,440 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6733bad1-7ac1-4a5e-9834-1e392b9d29c2/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-10-15 20:10:18,509 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 1 check-sat command(s) [2021-10-15 20:10:18,509 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-15 20:10:18,510 INFO L263 TraceCheckSpWp]: Trace formula consists of 79 conjuncts, 3 conjunts are in the unsatisfiable core [2021-10-15 20:10:18,512 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-15 20:10:18,647 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-10-15 20:10:18,647 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [464980174] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-15 20:10:18,648 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2021-10-15 20:10:18,648 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [4] total 6 [2021-10-15 20:10:18,648 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [555482883] [2021-10-15 20:10:18,649 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-10-15 20:10:18,649 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-15 20:10:18,650 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-10-15 20:10:18,650 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-10-15 20:10:18,651 INFO L499 CegarLoopForPetriNet]: Number of universal loopers: 27 out of 43 [2021-10-15 20:10:18,651 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 30 places, 29 transitions, 84 flow. Second operand has 4 states, 4 states have (on average 28.25) internal successors, (113), 4 states have internal predecessors, (113), 0 states have call successors, (0), 0 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 20:10:18,652 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-10-15 20:10:18,652 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 27 of 43 [2021-10-15 20:10:18,652 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-10-15 20:10:18,691 INFO L129 PetriNetUnfolder]: 9/48 cut-off events. [2021-10-15 20:10:18,691 INFO L130 PetriNetUnfolder]: For 9/9 co-relation queries the response was YES. [2021-10-15 20:10:18,692 INFO L84 FinitePrefix]: Finished finitePrefix Result has 80 conditions, 48 events. 9/48 cut-off events. For 9/9 co-relation queries the response was YES. Maximal size of possible extension queue 2. Compared 19 event pairs, 0 based on Foata normal form. 0/39 useless extension candidates. Maximal degree in co-relation 74. Up to 8 conditions per place. [2021-10-15 20:10:18,693 INFO L132 encePairwiseOnDemand]: 37/43 looper letters, 7 selfloop transitions, 5 changer transitions 0/33 dead transitions. [2021-10-15 20:10:18,693 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 33 places, 33 transitions, 116 flow [2021-10-15 20:10:18,693 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-10-15 20:10:18,694 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4 states. [2021-10-15 20:10:18,695 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4 states to 4 states and 121 transitions. [2021-10-15 20:10:18,696 INFO L544 CegarLoopForPetriNet]: DFA transition density 0.7034883720930233 [2021-10-15 20:10:18,696 INFO L72 ComplementDD]: Start complementDD. Operand 4 states and 121 transitions. [2021-10-15 20:10:18,696 INFO L73 IsDeterministic]: Start isDeterministic. Operand 4 states and 121 transitions. [2021-10-15 20:10:18,697 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-10-15 20:10:18,697 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 4 states and 121 transitions. [2021-10-15 20:10:18,698 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 5 states, 4 states have (on average 30.25) internal successors, (121), 4 states have internal predecessors, (121), 0 states have call successors, (0), 0 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 20:10:18,700 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 5 states, 5 states have (on average 43.0) internal successors, (215), 5 states have internal predecessors, (215), 0 states have call successors, (0), 0 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 20:10:18,700 INFO L81 ComplementDD]: Finished complementDD. Result has 5 states, 5 states have (on average 43.0) internal successors, (215), 5 states have internal predecessors, (215), 0 states have call successors, (0), 0 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 20:10:18,701 INFO L186 Difference]: Start difference. First operand has 30 places, 29 transitions, 84 flow. Second operand 4 states and 121 transitions. [2021-10-15 20:10:18,701 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 33 places, 33 transitions, 116 flow [2021-10-15 20:10:18,702 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 32 places, 33 transitions, 112 flow, removed 1 selfloop flow, removed 1 redundant places. [2021-10-15 20:10:18,704 INFO L242 Difference]: Finished difference. Result has 33 places, 31 transitions, 104 flow [2021-10-15 20:10:18,704 INFO L317 CegarLoopForPetriNet]: {PETRI_ALPHABET=43, PETRI_DIFFERENCE_MINUEND_FLOW=80, PETRI_DIFFERENCE_MINUEND_PLACES=29, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=29, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=3, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=24, PETRI_DIFFERENCE_SUBTRAHEND_STATES=4, PETRI_FLOW=104, PETRI_PLACES=33, PETRI_TRANSITIONS=31} [2021-10-15 20:10:18,704 INFO L334 CegarLoopForPetriNet]: 22 programPoint places, 11 predicate places. [2021-10-15 20:10:18,704 INFO L470 AbstractCegarLoop]: Abstraction has has 33 places, 31 transitions, 104 flow [2021-10-15 20:10:18,705 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 28.25) internal successors, (113), 4 states have internal predecessors, (113), 0 states have call successors, (0), 0 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 20:10:18,705 INFO L246 CegarLoopForPetriNet]: Found error trace [2021-10-15 20:10:18,705 INFO L254 CegarLoopForPetriNet]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-15 20:10:18,744 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6733bad1-7ac1-4a5e-9834-1e392b9d29c2/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-10-15 20:10:18,920 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6733bad1-7ac1-4a5e-9834-1e392b9d29c2/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-15 20:10:18,920 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-15 20:10:18,921 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-15 20:10:18,921 INFO L82 PathProgramCache]: Analyzing trace with hash -1225018616, now seen corresponding path program 1 times [2021-10-15 20:10:18,921 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-15 20:10:18,921 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [381490536] [2021-10-15 20:10:18,922 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-15 20:10:18,922 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-15 20:10:18,944 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-15 20:10:18,982 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 4 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-15 20:10:18,982 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-15 20:10:18,982 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [381490536] [2021-10-15 20:10:18,983 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [381490536] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-15 20:10:18,983 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [561807786] [2021-10-15 20:10:18,983 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-15 20:10:18,983 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-15 20:10:18,983 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6733bad1-7ac1-4a5e-9834-1e392b9d29c2/bin/uautomizer-hJ6jxDFKc3/z3 [2021-10-15 20:10:18,984 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6733bad1-7ac1-4a5e-9834-1e392b9d29c2/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-15 20:10:19,008 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6733bad1-7ac1-4a5e-9834-1e392b9d29c2/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-10-15 20:10:19,085 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-15 20:10:19,087 INFO L263 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 4 conjunts are in the unsatisfiable core [2021-10-15 20:10:19,091 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-15 20:10:19,268 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-10-15 20:10:19,268 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [561807786] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-15 20:10:19,268 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-10-15 20:10:19,269 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 5] total 7 [2021-10-15 20:10:19,269 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1346202015] [2021-10-15 20:10:19,269 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-10-15 20:10:19,270 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-15 20:10:19,270 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-10-15 20:10:19,271 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2021-10-15 20:10:19,272 INFO L499 CegarLoopForPetriNet]: Number of universal loopers: 19 out of 43 [2021-10-15 20:10:19,272 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 33 places, 31 transitions, 104 flow. Second operand has 7 states, 7 states have (on average 23.142857142857142) internal successors, (162), 7 states have internal predecessors, (162), 0 states have call successors, (0), 0 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 20:10:19,273 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-10-15 20:10:19,273 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 19 of 43 [2021-10-15 20:10:19,273 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-10-15 20:10:19,445 INFO L129 PetriNetUnfolder]: 10/61 cut-off events. [2021-10-15 20:10:19,446 INFO L130 PetriNetUnfolder]: For 15/15 co-relation queries the response was YES. [2021-10-15 20:10:19,447 INFO L84 FinitePrefix]: Finished finitePrefix Result has 122 conditions, 61 events. 10/61 cut-off events. For 15/15 co-relation queries the response was YES. Maximal size of possible extension queue 2. Compared 23 event pairs, 0 based on Foata normal form. 1/52 useless extension candidates. Maximal degree in co-relation 114. Up to 15 conditions per place. [2021-10-15 20:10:19,449 INFO L132 encePairwiseOnDemand]: 34/43 looper letters, 20 selfloop transitions, 9 changer transitions 0/41 dead transitions. [2021-10-15 20:10:19,452 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 39 places, 41 transitions, 188 flow [2021-10-15 20:10:19,452 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-10-15 20:10:19,453 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7 states. [2021-10-15 20:10:19,455 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7 states to 7 states and 163 transitions. [2021-10-15 20:10:19,460 INFO L544 CegarLoopForPetriNet]: DFA transition density 0.5415282392026578 [2021-10-15 20:10:19,460 INFO L72 ComplementDD]: Start complementDD. Operand 7 states and 163 transitions. [2021-10-15 20:10:19,460 INFO L73 IsDeterministic]: Start isDeterministic. Operand 7 states and 163 transitions. [2021-10-15 20:10:19,461 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-10-15 20:10:19,466 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 7 states and 163 transitions. [2021-10-15 20:10:19,468 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 8 states, 7 states have (on average 23.285714285714285) internal successors, (163), 7 states have internal predecessors, (163), 0 states have call successors, (0), 0 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 20:10:19,469 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 8 states, 8 states have (on average 43.0) internal successors, (344), 8 states have internal predecessors, (344), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-15 20:10:19,470 INFO L81 ComplementDD]: Finished complementDD. Result has 8 states, 8 states have (on average 43.0) internal successors, (344), 8 states have internal predecessors, (344), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-15 20:10:19,470 INFO L186 Difference]: Start difference. First operand has 33 places, 31 transitions, 104 flow. Second operand 7 states and 163 transitions. [2021-10-15 20:10:19,471 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 39 places, 41 transitions, 188 flow [2021-10-15 20:10:19,472 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 37 places, 41 transitions, 182 flow, removed 0 selfloop flow, removed 2 redundant places. [2021-10-15 20:10:19,475 INFO L242 Difference]: Finished difference. Result has 40 places, 34 transitions, 149 flow [2021-10-15 20:10:19,478 INFO L317 CegarLoopForPetriNet]: {PETRI_ALPHABET=43, PETRI_DIFFERENCE_MINUEND_FLOW=98, PETRI_DIFFERENCE_MINUEND_PLACES=31, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=31, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=6, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=22, PETRI_DIFFERENCE_SUBTRAHEND_STATES=7, PETRI_FLOW=149, PETRI_PLACES=40, PETRI_TRANSITIONS=34} [2021-10-15 20:10:19,478 INFO L334 CegarLoopForPetriNet]: 22 programPoint places, 18 predicate places. [2021-10-15 20:10:19,479 INFO L470 AbstractCegarLoop]: Abstraction has has 40 places, 34 transitions, 149 flow [2021-10-15 20:10:19,479 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 23.142857142857142) internal successors, (162), 7 states have internal predecessors, (162), 0 states have call successors, (0), 0 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 20:10:19,479 INFO L246 CegarLoopForPetriNet]: Found error trace [2021-10-15 20:10:19,479 INFO L254 CegarLoopForPetriNet]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-15 20:10:19,509 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6733bad1-7ac1-4a5e-9834-1e392b9d29c2/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-10-15 20:10:19,697 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6733bad1-7ac1-4a5e-9834-1e392b9d29c2/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-15 20:10:19,697 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-15 20:10:19,697 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-15 20:10:19,698 INFO L82 PathProgramCache]: Analyzing trace with hash 1570454256, now seen corresponding path program 1 times [2021-10-15 20:10:19,698 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-15 20:10:19,698 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2134720269] [2021-10-15 20:10:19,698 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-15 20:10:19,698 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-15 20:10:19,760 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-15 20:10:19,854 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-10-15 20:10:19,855 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-15 20:10:19,856 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2134720269] [2021-10-15 20:10:19,857 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2134720269] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-15 20:10:19,857 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [561230504] [2021-10-15 20:10:19,857 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-15 20:10:19,857 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-15 20:10:19,857 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6733bad1-7ac1-4a5e-9834-1e392b9d29c2/bin/uautomizer-hJ6jxDFKc3/z3 [2021-10-15 20:10:19,862 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6733bad1-7ac1-4a5e-9834-1e392b9d29c2/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-15 20:10:19,863 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6733bad1-7ac1-4a5e-9834-1e392b9d29c2/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-10-15 20:10:19,983 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-15 20:10:19,985 INFO L263 TraceCheckSpWp]: Trace formula consists of 181 conjuncts, 5 conjunts are in the unsatisfiable core [2021-10-15 20:10:19,987 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-15 20:10:20,085 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 1 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-10-15 20:10:20,085 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [561230504] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-15 20:10:20,085 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-10-15 20:10:20,085 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 7 [2021-10-15 20:10:20,086 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1344584958] [2021-10-15 20:10:20,086 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-10-15 20:10:20,086 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-15 20:10:20,087 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-10-15 20:10:20,087 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=26, Unknown=0, NotChecked=0, Total=42 [2021-10-15 20:10:20,088 INFO L499 CegarLoopForPetriNet]: Number of universal loopers: 25 out of 43 [2021-10-15 20:10:20,089 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 40 places, 34 transitions, 149 flow. Second operand has 7 states, 7 states have (on average 27.428571428571427) internal successors, (192), 7 states have internal predecessors, (192), 0 states have call successors, (0), 0 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 20:10:20,089 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-10-15 20:10:20,089 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 25 of 43 [2021-10-15 20:10:20,090 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-10-15 20:10:20,149 INFO L129 PetriNetUnfolder]: 10/63 cut-off events. [2021-10-15 20:10:20,149 INFO L130 PetriNetUnfolder]: For 51/51 co-relation queries the response was YES. [2021-10-15 20:10:20,150 INFO L84 FinitePrefix]: Finished finitePrefix Result has 138 conditions, 63 events. 10/63 cut-off events. For 51/51 co-relation queries the response was YES. Maximal size of possible extension queue 2. Compared 25 event pairs, 0 based on Foata normal form. 0/54 useless extension candidates. Maximal degree in co-relation 127. Up to 15 conditions per place. [2021-10-15 20:10:20,152 INFO L132 encePairwiseOnDemand]: 36/43 looper letters, 13 selfloop transitions, 6 changer transitions 0/39 dead transitions. [2021-10-15 20:10:20,153 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 44 places, 39 transitions, 197 flow [2021-10-15 20:10:20,153 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-10-15 20:10:20,153 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5 states. [2021-10-15 20:10:20,158 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5 states to 5 states and 143 transitions. [2021-10-15 20:10:20,159 INFO L544 CegarLoopForPetriNet]: DFA transition density 0.6651162790697674 [2021-10-15 20:10:20,159 INFO L72 ComplementDD]: Start complementDD. Operand 5 states and 143 transitions. [2021-10-15 20:10:20,159 INFO L73 IsDeterministic]: Start isDeterministic. Operand 5 states and 143 transitions. [2021-10-15 20:10:20,159 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-10-15 20:10:20,159 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 5 states and 143 transitions. [2021-10-15 20:10:20,160 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 6 states, 5 states have (on average 28.6) internal successors, (143), 5 states have internal predecessors, (143), 0 states have call successors, (0), 0 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 20:10:20,162 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 6 states, 6 states have (on average 43.0) internal successors, (258), 6 states have internal predecessors, (258), 0 states have call successors, (0), 0 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 20:10:20,162 INFO L81 ComplementDD]: Finished complementDD. Result has 6 states, 6 states have (on average 43.0) internal successors, (258), 6 states have internal predecessors, (258), 0 states have call successors, (0), 0 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 20:10:20,162 INFO L186 Difference]: Start difference. First operand has 40 places, 34 transitions, 149 flow. Second operand 5 states and 143 transitions. [2021-10-15 20:10:20,162 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 44 places, 39 transitions, 197 flow [2021-10-15 20:10:20,165 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 40 places, 39 transitions, 179 flow, removed 3 selfloop flow, removed 4 redundant places. [2021-10-15 20:10:20,173 INFO L242 Difference]: Finished difference. Result has 42 places, 36 transitions, 160 flow [2021-10-15 20:10:20,173 INFO L317 CegarLoopForPetriNet]: {PETRI_ALPHABET=43, PETRI_DIFFERENCE_MINUEND_FLOW=131, PETRI_DIFFERENCE_MINUEND_PLACES=36, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=34, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=4, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=28, PETRI_DIFFERENCE_SUBTRAHEND_STATES=5, PETRI_FLOW=160, PETRI_PLACES=42, PETRI_TRANSITIONS=36} [2021-10-15 20:10:20,174 INFO L334 CegarLoopForPetriNet]: 22 programPoint places, 20 predicate places. [2021-10-15 20:10:20,174 INFO L470 AbstractCegarLoop]: Abstraction has has 42 places, 36 transitions, 160 flow [2021-10-15 20:10:20,175 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 27.428571428571427) internal successors, (192), 7 states have internal predecessors, (192), 0 states have call successors, (0), 0 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 20:10:20,175 INFO L246 CegarLoopForPetriNet]: Found error trace [2021-10-15 20:10:20,175 INFO L254 CegarLoopForPetriNet]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-15 20:10:20,200 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6733bad1-7ac1-4a5e-9834-1e392b9d29c2/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-10-15 20:10:20,380 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6733bad1-7ac1-4a5e-9834-1e392b9d29c2/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-15 20:10:20,380 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-15 20:10:20,381 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-15 20:10:20,381 INFO L82 PathProgramCache]: Analyzing trace with hash 1683059085, now seen corresponding path program 1 times [2021-10-15 20:10:20,381 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-15 20:10:20,381 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [567272973] [2021-10-15 20:10:20,381 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-15 20:10:20,381 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-15 20:10:20,392 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-15 20:10:20,431 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-10-15 20:10:20,432 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-15 20:10:20,432 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [567272973] [2021-10-15 20:10:20,432 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [567272973] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-15 20:10:20,432 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-15 20:10:20,432 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-10-15 20:10:20,433 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [218422621] [2021-10-15 20:10:20,433 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-10-15 20:10:20,433 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-15 20:10:20,434 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-10-15 20:10:20,434 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-10-15 20:10:20,434 INFO L499 CegarLoopForPetriNet]: Number of universal loopers: 30 out of 43 [2021-10-15 20:10:20,434 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 42 places, 36 transitions, 160 flow. Second operand has 3 states, 3 states have (on average 32.333333333333336) internal successors, (97), 3 states have internal predecessors, (97), 0 states have call successors, (0), 0 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 20:10:20,435 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-10-15 20:10:20,435 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 30 of 43 [2021-10-15 20:10:20,435 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-10-15 20:10:20,458 INFO L129 PetriNetUnfolder]: 9/62 cut-off events. [2021-10-15 20:10:20,461 INFO L130 PetriNetUnfolder]: For 27/27 co-relation queries the response was YES. [2021-10-15 20:10:20,461 INFO L84 FinitePrefix]: Finished finitePrefix Result has 134 conditions, 62 events. 9/62 cut-off events. For 27/27 co-relation queries the response was YES. Maximal size of possible extension queue 2. Compared 24 event pairs, 0 based on Foata normal form. 1/54 useless extension candidates. Maximal degree in co-relation 121. Up to 9 conditions per place. [2021-10-15 20:10:20,462 INFO L132 encePairwiseOnDemand]: 40/43 looper letters, 6 selfloop transitions, 2 changer transitions 0/37 dead transitions. [2021-10-15 20:10:20,463 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 44 places, 37 transitions, 178 flow [2021-10-15 20:10:20,463 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-10-15 20:10:20,464 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2021-10-15 20:10:20,464 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 99 transitions. [2021-10-15 20:10:20,465 INFO L544 CegarLoopForPetriNet]: DFA transition density 0.7674418604651163 [2021-10-15 20:10:20,467 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 99 transitions. [2021-10-15 20:10:20,468 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 99 transitions. [2021-10-15 20:10:20,468 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-10-15 20:10:20,468 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 99 transitions. [2021-10-15 20:10:20,469 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 33.0) internal successors, (99), 3 states have internal predecessors, (99), 0 states have call successors, (0), 0 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 20:10:20,470 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 43.0) internal successors, (172), 4 states have internal predecessors, (172), 0 states have call successors, (0), 0 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 20:10:20,471 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 43.0) internal successors, (172), 4 states have internal predecessors, (172), 0 states have call successors, (0), 0 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 20:10:20,471 INFO L186 Difference]: Start difference. First operand has 42 places, 36 transitions, 160 flow. Second operand 3 states and 99 transitions. [2021-10-15 20:10:20,471 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 44 places, 37 transitions, 178 flow [2021-10-15 20:10:20,474 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 42 places, 37 transitions, 171 flow, removed 1 selfloop flow, removed 2 redundant places. [2021-10-15 20:10:20,476 INFO L242 Difference]: Finished difference. Result has 43 places, 36 transitions, 161 flow [2021-10-15 20:10:20,477 INFO L317 CegarLoopForPetriNet]: {PETRI_ALPHABET=43, PETRI_DIFFERENCE_MINUEND_FLOW=153, PETRI_DIFFERENCE_MINUEND_PLACES=40, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=36, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=2, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=34, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=161, PETRI_PLACES=43, PETRI_TRANSITIONS=36} [2021-10-15 20:10:20,478 INFO L334 CegarLoopForPetriNet]: 22 programPoint places, 21 predicate places. [2021-10-15 20:10:20,478 INFO L470 AbstractCegarLoop]: Abstraction has has 43 places, 36 transitions, 161 flow [2021-10-15 20:10:20,478 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 32.333333333333336) internal successors, (97), 3 states have internal predecessors, (97), 0 states have call successors, (0), 0 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 20:10:20,479 INFO L246 CegarLoopForPetriNet]: Found error trace [2021-10-15 20:10:20,479 INFO L254 CegarLoopForPetriNet]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-15 20:10:20,479 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-10-15 20:10:20,479 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-15 20:10:20,480 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-15 20:10:20,480 INFO L82 PathProgramCache]: Analyzing trace with hash -688680177, now seen corresponding path program 1 times [2021-10-15 20:10:20,480 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-15 20:10:20,482 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [975343398] [2021-10-15 20:10:20,483 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-15 20:10:20,483 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-15 20:10:20,586 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-15 20:10:21,122 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 2 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-15 20:10:21,122 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-15 20:10:21,122 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [975343398] [2021-10-15 20:10:21,122 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [975343398] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-15 20:10:21,123 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1774393178] [2021-10-15 20:10:21,123 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-15 20:10:21,123 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-15 20:10:21,123 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6733bad1-7ac1-4a5e-9834-1e392b9d29c2/bin/uautomizer-hJ6jxDFKc3/z3 [2021-10-15 20:10:21,126 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6733bad1-7ac1-4a5e-9834-1e392b9d29c2/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-15 20:10:21,153 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6733bad1-7ac1-4a5e-9834-1e392b9d29c2/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-10-15 20:10:21,245 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-15 20:10:21,247 INFO L263 TraceCheckSpWp]: Trace formula consists of 188 conjuncts, 69 conjunts are in the unsatisfiable core [2021-10-15 20:10:21,251 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-15 20:10:21,309 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-10-15 20:10:21,420 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-10-15 20:10:21,421 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 11 treesize of output 11 [2021-10-15 20:10:21,477 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-10-15 20:10:21,480 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 19 [2021-10-15 20:10:21,562 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-10-15 20:10:21,579 INFO L354 Elim1Store]: treesize reduction 68, result has 21.8 percent of original size [2021-10-15 20:10:21,582 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 45 treesize of output 38 [2021-10-15 20:10:22,189 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-10-15 20:10:22,211 INFO L354 Elim1Store]: treesize reduction 63, result has 12.5 percent of original size [2021-10-15 20:10:22,212 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 4 new quantified variables, introduced 3 case distinctions, treesize of input 44 treesize of output 37 [2021-10-15 20:10:22,446 INFO L173 IndexEqualityManager]: detected equality via solver [2021-10-15 20:10:22,453 INFO L354 Elim1Store]: treesize reduction 30, result has 3.2 percent of original size [2021-10-15 20:10:22,454 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 1 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 3 case distinctions, treesize of input 38 treesize of output 17 [2021-10-15 20:10:22,553 INFO L354 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2021-10-15 20:10:22,554 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 22 [2021-10-15 20:10:22,752 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 22 treesize of output 10 [2021-10-15 20:10:22,829 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 2 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-15 20:10:22,829 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1774393178] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-15 20:10:22,830 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-10-15 20:10:22,830 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20] total 38 [2021-10-15 20:10:22,830 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1791585815] [2021-10-15 20:10:22,830 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2021-10-15 20:10:22,831 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-15 20:10:22,831 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2021-10-15 20:10:22,832 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=127, Invalid=1279, Unknown=0, NotChecked=0, Total=1406 [2021-10-15 20:10:22,833 INFO L499 CegarLoopForPetriNet]: Number of universal loopers: 9 out of 43 [2021-10-15 20:10:22,834 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 43 places, 36 transitions, 161 flow. Second operand has 38 states, 38 states have (on average 10.394736842105264) internal successors, (395), 38 states have internal predecessors, (395), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-15 20:10:22,834 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-10-15 20:10:22,834 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 9 of 43 [2021-10-15 20:10:22,834 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-10-15 20:10:25,136 INFO L129 PetriNetUnfolder]: 19/124 cut-off events. [2021-10-15 20:10:25,141 INFO L130 PetriNetUnfolder]: For 41/41 co-relation queries the response was YES. [2021-10-15 20:10:25,142 INFO L84 FinitePrefix]: Finished finitePrefix Result has 330 conditions, 124 events. 19/124 cut-off events. For 41/41 co-relation queries the response was YES. Maximal size of possible extension queue 6. Compared 215 event pairs, 0 based on Foata normal form. 0/118 useless extension candidates. Maximal degree in co-relation 316. Up to 38 conditions per place. [2021-10-15 20:10:25,146 INFO L132 encePairwiseOnDemand]: 24/43 looper letters, 44 selfloop transitions, 36 changer transitions 0/84 dead transitions. [2021-10-15 20:10:25,146 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 70 places, 84 transitions, 488 flow [2021-10-15 20:10:25,146 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-10-15 20:10:25,147 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2021-10-15 20:10:25,149 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 326 transitions. [2021-10-15 20:10:25,150 INFO L544 CegarLoopForPetriNet]: DFA transition density 0.2707641196013289 [2021-10-15 20:10:25,150 INFO L72 ComplementDD]: Start complementDD. Operand 28 states and 326 transitions. [2021-10-15 20:10:25,151 INFO L73 IsDeterministic]: Start isDeterministic. Operand 28 states and 326 transitions. [2021-10-15 20:10:25,152 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-10-15 20:10:25,153 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 28 states and 326 transitions. [2021-10-15 20:10:25,155 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 29 states, 28 states have (on average 11.642857142857142) internal successors, (326), 28 states have internal predecessors, (326), 0 states have call successors, (0), 0 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 20:10:25,162 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 29 states, 29 states have (on average 43.0) internal successors, (1247), 29 states have internal predecessors, (1247), 0 states have call successors, (0), 0 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 20:10:25,165 INFO L81 ComplementDD]: Finished complementDD. Result has 29 states, 29 states have (on average 43.0) internal successors, (1247), 29 states have internal predecessors, (1247), 0 states have call successors, (0), 0 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 20:10:25,170 INFO L186 Difference]: Start difference. First operand has 43 places, 36 transitions, 161 flow. Second operand 28 states and 326 transitions. [2021-10-15 20:10:25,170 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 70 places, 84 transitions, 488 flow [2021-10-15 20:10:25,173 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 68 places, 84 transitions, 484 flow, removed 0 selfloop flow, removed 2 redundant places. [2021-10-15 20:10:25,179 INFO L242 Difference]: Finished difference. Result has 77 places, 63 transitions, 396 flow [2021-10-15 20:10:25,182 INFO L317 CegarLoopForPetriNet]: {PETRI_ALPHABET=43, PETRI_DIFFERENCE_MINUEND_FLOW=157, PETRI_DIFFERENCE_MINUEND_PLACES=41, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=36, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=15, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=13, PETRI_DIFFERENCE_SUBTRAHEND_STATES=28, PETRI_FLOW=396, PETRI_PLACES=77, PETRI_TRANSITIONS=63} [2021-10-15 20:10:25,183 INFO L334 CegarLoopForPetriNet]: 22 programPoint places, 55 predicate places. [2021-10-15 20:10:25,183 INFO L470 AbstractCegarLoop]: Abstraction has has 77 places, 63 transitions, 396 flow [2021-10-15 20:10:25,183 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 38 states have (on average 10.394736842105264) internal successors, (395), 38 states have internal predecessors, (395), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-15 20:10:25,184 INFO L246 CegarLoopForPetriNet]: Found error trace [2021-10-15 20:10:25,184 INFO L254 CegarLoopForPetriNet]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-15 20:10:25,217 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6733bad1-7ac1-4a5e-9834-1e392b9d29c2/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-10-15 20:10:25,384 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6733bad1-7ac1-4a5e-9834-1e392b9d29c2/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-15 20:10:25,385 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-15 20:10:25,385 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-15 20:10:25,385 INFO L82 PathProgramCache]: Analyzing trace with hash -1908545476, now seen corresponding path program 2 times [2021-10-15 20:10:25,385 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-15 20:10:25,386 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1978611136] [2021-10-15 20:10:25,386 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-15 20:10:25,386 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-15 20:10:25,402 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-15 20:10:25,426 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-10-15 20:10:25,426 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-15 20:10:25,427 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1978611136] [2021-10-15 20:10:25,427 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1978611136] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-15 20:10:25,427 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-15 20:10:25,427 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-10-15 20:10:25,427 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [432598144] [2021-10-15 20:10:25,428 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-10-15 20:10:25,428 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-15 20:10:25,428 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-10-15 20:10:25,429 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-10-15 20:10:25,429 INFO L499 CegarLoopForPetriNet]: Number of universal loopers: 25 out of 43 [2021-10-15 20:10:25,429 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 77 places, 63 transitions, 396 flow. Second operand has 4 states, 4 states have (on average 27.75) internal successors, (111), 4 states have internal predecessors, (111), 0 states have call successors, (0), 0 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 20:10:25,430 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-10-15 20:10:25,430 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 25 of 43 [2021-10-15 20:10:25,430 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-10-15 20:10:25,485 INFO L129 PetriNetUnfolder]: 16/114 cut-off events. [2021-10-15 20:10:25,485 INFO L130 PetriNetUnfolder]: For 113/113 co-relation queries the response was YES. [2021-10-15 20:10:25,488 INFO L84 FinitePrefix]: Finished finitePrefix Result has 362 conditions, 114 events. 16/114 cut-off events. For 113/113 co-relation queries the response was YES. Maximal size of possible extension queue 6. Compared 193 event pairs, 0 based on Foata normal form. 1/109 useless extension candidates. Maximal degree in co-relation 339. Up to 36 conditions per place. [2021-10-15 20:10:25,489 INFO L132 encePairwiseOnDemand]: 37/43 looper letters, 20 selfloop transitions, 9 changer transitions 0/62 dead transitions. [2021-10-15 20:10:25,490 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 81 places, 62 transitions, 443 flow [2021-10-15 20:10:25,490 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-10-15 20:10:25,490 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5 states. [2021-10-15 20:10:25,491 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5 states to 5 states and 142 transitions. [2021-10-15 20:10:25,491 INFO L544 CegarLoopForPetriNet]: DFA transition density 0.6604651162790698 [2021-10-15 20:10:25,491 INFO L72 ComplementDD]: Start complementDD. Operand 5 states and 142 transitions. [2021-10-15 20:10:25,491 INFO L73 IsDeterministic]: Start isDeterministic. Operand 5 states and 142 transitions. [2021-10-15 20:10:25,492 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-10-15 20:10:25,492 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 5 states and 142 transitions. [2021-10-15 20:10:25,492 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 6 states, 5 states have (on average 28.4) internal successors, (142), 5 states have internal predecessors, (142), 0 states have call successors, (0), 0 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 20:10:25,493 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 6 states, 6 states have (on average 43.0) internal successors, (258), 6 states have internal predecessors, (258), 0 states have call successors, (0), 0 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 20:10:25,494 INFO L81 ComplementDD]: Finished complementDD. Result has 6 states, 6 states have (on average 43.0) internal successors, (258), 6 states have internal predecessors, (258), 0 states have call successors, (0), 0 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 20:10:25,494 INFO L186 Difference]: Start difference. First operand has 77 places, 63 transitions, 396 flow. Second operand 5 states and 142 transitions. [2021-10-15 20:10:25,494 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 81 places, 62 transitions, 443 flow [2021-10-15 20:10:25,500 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 72 places, 62 transitions, 414 flow, removed 4 selfloop flow, removed 9 redundant places. [2021-10-15 20:10:25,503 INFO L242 Difference]: Finished difference. Result has 72 places, 60 transitions, 364 flow [2021-10-15 20:10:25,504 INFO L317 CegarLoopForPetriNet]: {PETRI_ALPHABET=43, PETRI_DIFFERENCE_MINUEND_FLOW=346, PETRI_DIFFERENCE_MINUEND_PLACES=68, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=60, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=9, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=51, PETRI_DIFFERENCE_SUBTRAHEND_STATES=5, PETRI_FLOW=364, PETRI_PLACES=72, PETRI_TRANSITIONS=60} [2021-10-15 20:10:25,504 INFO L334 CegarLoopForPetriNet]: 22 programPoint places, 50 predicate places. [2021-10-15 20:10:25,504 INFO L470 AbstractCegarLoop]: Abstraction has has 72 places, 60 transitions, 364 flow [2021-10-15 20:10:25,505 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 27.75) internal successors, (111), 4 states have internal predecessors, (111), 0 states have call successors, (0), 0 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 20:10:25,505 INFO L246 CegarLoopForPetriNet]: Found error trace [2021-10-15 20:10:25,505 INFO L254 CegarLoopForPetriNet]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-15 20:10:25,505 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-10-15 20:10:25,506 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-15 20:10:25,506 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-15 20:10:25,506 INFO L82 PathProgramCache]: Analyzing trace with hash -2002370864, now seen corresponding path program 3 times [2021-10-15 20:10:25,506 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-15 20:10:25,506 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [193669559] [2021-10-15 20:10:25,507 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-15 20:10:25,507 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-15 20:10:25,544 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-15 20:10:25,593 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 7 proven. 4 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-10-15 20:10:25,593 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-15 20:10:25,593 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [193669559] [2021-10-15 20:10:25,594 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [193669559] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-15 20:10:25,594 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2111831576] [2021-10-15 20:10:25,594 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-10-15 20:10:25,594 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-15 20:10:25,594 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6733bad1-7ac1-4a5e-9834-1e392b9d29c2/bin/uautomizer-hJ6jxDFKc3/z3 [2021-10-15 20:10:25,595 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6733bad1-7ac1-4a5e-9834-1e392b9d29c2/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-15 20:10:25,613 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6733bad1-7ac1-4a5e-9834-1e392b9d29c2/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-10-15 20:10:25,863 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-10-15 20:10:25,864 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-15 20:10:25,865 INFO L263 TraceCheckSpWp]: Trace formula consists of 195 conjuncts, 6 conjunts are in the unsatisfiable core [2021-10-15 20:10:25,867 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-15 20:10:25,968 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 8 proven. 3 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-10-15 20:10:25,969 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2111831576] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-15 20:10:25,969 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-10-15 20:10:25,969 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 8 [2021-10-15 20:10:25,969 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2071290743] [2021-10-15 20:10:25,970 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-10-15 20:10:25,970 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-15 20:10:25,971 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-10-15 20:10:25,971 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2021-10-15 20:10:25,972 INFO L499 CegarLoopForPetriNet]: Number of universal loopers: 25 out of 43 [2021-10-15 20:10:25,972 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 72 places, 60 transitions, 364 flow. Second operand has 8 states, 8 states have (on average 27.375) internal successors, (219), 8 states have internal predecessors, (219), 0 states have call successors, (0), 0 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 20:10:25,972 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-10-15 20:10:25,972 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 25 of 43 [2021-10-15 20:10:25,973 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-10-15 20:10:26,048 INFO L129 PetriNetUnfolder]: 14/109 cut-off events. [2021-10-15 20:10:26,049 INFO L130 PetriNetUnfolder]: For 115/115 co-relation queries the response was YES. [2021-10-15 20:10:26,049 INFO L84 FinitePrefix]: Finished finitePrefix Result has 334 conditions, 109 events. 14/109 cut-off events. For 115/115 co-relation queries the response was YES. Maximal size of possible extension queue 5. Compared 154 event pairs, 0 based on Foata normal form. 1/104 useless extension candidates. Maximal degree in co-relation 315. Up to 15 conditions per place. [2021-10-15 20:10:26,050 INFO L132 encePairwiseOnDemand]: 36/43 looper letters, 15 selfloop transitions, 15 changer transitions 0/62 dead transitions. [2021-10-15 20:10:26,050 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 78 places, 62 transitions, 433 flow [2021-10-15 20:10:26,051 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-10-15 20:10:26,051 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 8 states. [2021-10-15 20:10:26,052 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8 states to 8 states and 222 transitions. [2021-10-15 20:10:26,052 INFO L544 CegarLoopForPetriNet]: DFA transition density 0.6453488372093024 [2021-10-15 20:10:26,053 INFO L72 ComplementDD]: Start complementDD. Operand 8 states and 222 transitions. [2021-10-15 20:10:26,053 INFO L73 IsDeterministic]: Start isDeterministic. Operand 8 states and 222 transitions. [2021-10-15 20:10:26,053 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-10-15 20:10:26,053 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 8 states and 222 transitions. [2021-10-15 20:10:26,054 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 9 states, 8 states have (on average 27.75) internal successors, (222), 8 states have internal predecessors, (222), 0 states have call successors, (0), 0 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 20:10:26,056 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 9 states, 9 states have (on average 43.0) internal successors, (387), 9 states have internal predecessors, (387), 0 states have call successors, (0), 0 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 20:10:26,056 INFO L81 ComplementDD]: Finished complementDD. Result has 9 states, 9 states have (on average 43.0) internal successors, (387), 9 states have internal predecessors, (387), 0 states have call successors, (0), 0 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 20:10:26,056 INFO L186 Difference]: Start difference. First operand has 72 places, 60 transitions, 364 flow. Second operand 8 states and 222 transitions. [2021-10-15 20:10:26,057 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 78 places, 62 transitions, 433 flow [2021-10-15 20:10:26,059 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 73 places, 62 transitions, 403 flow, removed 0 selfloop flow, removed 5 redundant places. [2021-10-15 20:10:26,061 INFO L242 Difference]: Finished difference. Result has 74 places, 59 transitions, 363 flow [2021-10-15 20:10:26,062 INFO L317 CegarLoopForPetriNet]: {PETRI_ALPHABET=43, PETRI_DIFFERENCE_MINUEND_FLOW=323, PETRI_DIFFERENCE_MINUEND_PLACES=66, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=58, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=14, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=43, PETRI_DIFFERENCE_SUBTRAHEND_STATES=8, PETRI_FLOW=363, PETRI_PLACES=74, PETRI_TRANSITIONS=59} [2021-10-15 20:10:26,063 INFO L334 CegarLoopForPetriNet]: 22 programPoint places, 52 predicate places. [2021-10-15 20:10:26,063 INFO L470 AbstractCegarLoop]: Abstraction has has 74 places, 59 transitions, 363 flow [2021-10-15 20:10:26,063 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 27.375) internal successors, (219), 8 states have internal predecessors, (219), 0 states have call successors, (0), 0 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 20:10:26,063 INFO L246 CegarLoopForPetriNet]: Found error trace [2021-10-15 20:10:26,064 INFO L254 CegarLoopForPetriNet]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-15 20:10:26,091 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6733bad1-7ac1-4a5e-9834-1e392b9d29c2/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-10-15 20:10:26,277 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6733bad1-7ac1-4a5e-9834-1e392b9d29c2/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-15 20:10:26,277 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-15 20:10:26,278 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-15 20:10:26,278 INFO L82 PathProgramCache]: Analyzing trace with hash 177405100, now seen corresponding path program 1 times [2021-10-15 20:10:26,278 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-15 20:10:26,278 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1564006602] [2021-10-15 20:10:26,278 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-15 20:10:26,278 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-15 20:10:26,291 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-15 20:10:26,316 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-10-15 20:10:26,317 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-15 20:10:26,317 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1564006602] [2021-10-15 20:10:26,317 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1564006602] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-15 20:10:26,317 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-15 20:10:26,317 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-10-15 20:10:26,318 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1624217102] [2021-10-15 20:10:26,318 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-10-15 20:10:26,318 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-15 20:10:26,319 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-10-15 20:10:26,319 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-10-15 20:10:26,320 INFO L499 CegarLoopForPetriNet]: Number of universal loopers: 25 out of 43 [2021-10-15 20:10:26,320 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 74 places, 59 transitions, 363 flow. Second operand has 4 states, 4 states have (on average 27.25) internal successors, (109), 4 states have internal predecessors, (109), 0 states have call successors, (0), 0 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 20:10:26,320 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-10-15 20:10:26,320 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 25 of 43 [2021-10-15 20:10:26,320 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-10-15 20:10:26,354 INFO L129 PetriNetUnfolder]: 11/98 cut-off events. [2021-10-15 20:10:26,354 INFO L130 PetriNetUnfolder]: For 100/100 co-relation queries the response was YES. [2021-10-15 20:10:26,355 INFO L84 FinitePrefix]: Finished finitePrefix Result has 313 conditions, 98 events. 11/98 cut-off events. For 100/100 co-relation queries the response was YES. Maximal size of possible extension queue 4. Compared 110 event pairs, 0 based on Foata normal form. 2/95 useless extension candidates. Maximal degree in co-relation 295. Up to 27 conditions per place. [2021-10-15 20:10:26,356 INFO L132 encePairwiseOnDemand]: 37/43 looper letters, 14 selfloop transitions, 10 changer transitions 0/60 dead transitions. [2021-10-15 20:10:26,356 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 78 places, 60 transitions, 406 flow [2021-10-15 20:10:26,356 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-10-15 20:10:26,357 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5 states. [2021-10-15 20:10:26,357 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5 states to 5 states and 142 transitions. [2021-10-15 20:10:26,358 INFO L544 CegarLoopForPetriNet]: DFA transition density 0.6604651162790698 [2021-10-15 20:10:26,358 INFO L72 ComplementDD]: Start complementDD. Operand 5 states and 142 transitions. [2021-10-15 20:10:26,358 INFO L73 IsDeterministic]: Start isDeterministic. Operand 5 states and 142 transitions. [2021-10-15 20:10:26,358 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-10-15 20:10:26,359 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 5 states and 142 transitions. [2021-10-15 20:10:26,359 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 6 states, 5 states have (on average 28.4) internal successors, (142), 5 states have internal predecessors, (142), 0 states have call successors, (0), 0 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 20:10:26,360 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 6 states, 6 states have (on average 43.0) internal successors, (258), 6 states have internal predecessors, (258), 0 states have call successors, (0), 0 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 20:10:26,361 INFO L81 ComplementDD]: Finished complementDD. Result has 6 states, 6 states have (on average 43.0) internal successors, (258), 6 states have internal predecessors, (258), 0 states have call successors, (0), 0 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 20:10:26,361 INFO L186 Difference]: Start difference. First operand has 74 places, 59 transitions, 363 flow. Second operand 5 states and 142 transitions. [2021-10-15 20:10:26,361 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 78 places, 60 transitions, 406 flow [2021-10-15 20:10:26,364 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 72 places, 60 transitions, 378 flow, removed 0 selfloop flow, removed 6 redundant places. [2021-10-15 20:10:26,366 INFO L242 Difference]: Finished difference. Result has 73 places, 59 transitions, 356 flow [2021-10-15 20:10:26,366 INFO L317 CegarLoopForPetriNet]: {PETRI_ALPHABET=43, PETRI_DIFFERENCE_MINUEND_FLOW=316, PETRI_DIFFERENCE_MINUEND_PLACES=68, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=57, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=9, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=48, PETRI_DIFFERENCE_SUBTRAHEND_STATES=5, PETRI_FLOW=356, PETRI_PLACES=73, PETRI_TRANSITIONS=59} [2021-10-15 20:10:26,366 INFO L334 CegarLoopForPetriNet]: 22 programPoint places, 51 predicate places. [2021-10-15 20:10:26,367 INFO L470 AbstractCegarLoop]: Abstraction has has 73 places, 59 transitions, 356 flow [2021-10-15 20:10:26,367 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 27.25) internal successors, (109), 4 states have internal predecessors, (109), 0 states have call successors, (0), 0 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 20:10:26,367 INFO L246 CegarLoopForPetriNet]: Found error trace [2021-10-15 20:10:26,367 INFO L254 CegarLoopForPetriNet]: trace histogram [3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-15 20:10:26,367 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2021-10-15 20:10:26,368 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-15 20:10:26,368 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-15 20:10:26,368 INFO L82 PathProgramCache]: Analyzing trace with hash 233107481, now seen corresponding path program 4 times [2021-10-15 20:10:26,368 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-15 20:10:26,369 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1947188983] [2021-10-15 20:10:26,369 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-15 20:10:26,369 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-15 20:10:26,386 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-15 20:10:26,445 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 17 proven. 6 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-10-15 20:10:26,446 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-15 20:10:26,446 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1947188983] [2021-10-15 20:10:26,446 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1947188983] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-15 20:10:26,446 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1860877209] [2021-10-15 20:10:26,446 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-10-15 20:10:26,447 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-15 20:10:26,447 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6733bad1-7ac1-4a5e-9834-1e392b9d29c2/bin/uautomizer-hJ6jxDFKc3/z3 [2021-10-15 20:10:26,448 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6733bad1-7ac1-4a5e-9834-1e392b9d29c2/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-15 20:10:26,477 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6733bad1-7ac1-4a5e-9834-1e392b9d29c2/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-10-15 20:10:26,621 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-10-15 20:10:26,621 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-15 20:10:26,623 INFO L263 TraceCheckSpWp]: Trace formula consists of 182 conjuncts, 5 conjunts are in the unsatisfiable core [2021-10-15 20:10:26,633 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-15 20:10:26,770 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 23 proven. 0 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-10-15 20:10:26,771 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1860877209] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-15 20:10:26,771 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2021-10-15 20:10:26,771 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [6] total 10 [2021-10-15 20:10:26,771 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1960315501] [2021-10-15 20:10:26,773 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-10-15 20:10:26,773 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-15 20:10:26,773 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-10-15 20:10:26,774 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=53, Unknown=0, NotChecked=0, Total=90 [2021-10-15 20:10:26,775 INFO L499 CegarLoopForPetriNet]: Number of universal loopers: 27 out of 43 [2021-10-15 20:10:26,776 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 73 places, 59 transitions, 356 flow. Second operand has 6 states, 6 states have (on average 28.833333333333332) internal successors, (173), 6 states have internal predecessors, (173), 0 states have call successors, (0), 0 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 20:10:26,776 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-10-15 20:10:26,776 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 27 of 43 [2021-10-15 20:10:26,776 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-10-15 20:10:26,805 INFO L129 PetriNetUnfolder]: 2/46 cut-off events. [2021-10-15 20:10:26,805 INFO L130 PetriNetUnfolder]: For 45/45 co-relation queries the response was YES. [2021-10-15 20:10:26,805 INFO L84 FinitePrefix]: Finished finitePrefix Result has 155 conditions, 46 events. 2/46 cut-off events. For 45/45 co-relation queries the response was YES. Maximal size of possible extension queue 2. Compared 12 event pairs, 0 based on Foata normal form. 2/47 useless extension candidates. Maximal degree in co-relation 135. Up to 4 conditions per place. [2021-10-15 20:10:26,806 INFO L132 encePairwiseOnDemand]: 36/43 looper letters, 5 selfloop transitions, 6 changer transitions 2/42 dead transitions. [2021-10-15 20:10:26,806 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 76 places, 42 transitions, 258 flow [2021-10-15 20:10:26,806 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-10-15 20:10:26,806 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6 states. [2021-10-15 20:10:26,807 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6 states to 6 states and 176 transitions. [2021-10-15 20:10:26,808 INFO L544 CegarLoopForPetriNet]: DFA transition density 0.6821705426356589 [2021-10-15 20:10:26,808 INFO L72 ComplementDD]: Start complementDD. Operand 6 states and 176 transitions. [2021-10-15 20:10:26,808 INFO L73 IsDeterministic]: Start isDeterministic. Operand 6 states and 176 transitions. [2021-10-15 20:10:26,808 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-10-15 20:10:26,808 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 6 states and 176 transitions. [2021-10-15 20:10:26,809 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 7 states, 6 states have (on average 29.333333333333332) internal successors, (176), 6 states have internal predecessors, (176), 0 states have call successors, (0), 0 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 20:10:26,810 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 7 states, 7 states have (on average 43.0) internal successors, (301), 7 states have internal predecessors, (301), 0 states have call successors, (0), 0 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 20:10:26,810 INFO L81 ComplementDD]: Finished complementDD. Result has 7 states, 7 states have (on average 43.0) internal successors, (301), 7 states have internal predecessors, (301), 0 states have call successors, (0), 0 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 20:10:26,811 INFO L186 Difference]: Start difference. First operand has 73 places, 59 transitions, 356 flow. Second operand 6 states and 176 transitions. [2021-10-15 20:10:26,811 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 76 places, 42 transitions, 258 flow [2021-10-15 20:10:26,812 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 59 places, 42 transitions, 210 flow, removed 2 selfloop flow, removed 17 redundant places. [2021-10-15 20:10:26,814 INFO L242 Difference]: Finished difference. Result has 59 places, 40 transitions, 190 flow [2021-10-15 20:10:26,814 INFO L317 CegarLoopForPetriNet]: {PETRI_ALPHABET=43, PETRI_DIFFERENCE_MINUEND_FLOW=186, PETRI_DIFFERENCE_MINUEND_PLACES=54, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=42, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=6, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=36, PETRI_DIFFERENCE_SUBTRAHEND_STATES=6, PETRI_FLOW=190, PETRI_PLACES=59, PETRI_TRANSITIONS=40} [2021-10-15 20:10:26,814 INFO L334 CegarLoopForPetriNet]: 22 programPoint places, 37 predicate places. [2021-10-15 20:10:26,814 INFO L470 AbstractCegarLoop]: Abstraction has has 59 places, 40 transitions, 190 flow [2021-10-15 20:10:26,815 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 28.833333333333332) internal successors, (173), 6 states have internal predecessors, (173), 0 states have call successors, (0), 0 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 20:10:26,815 INFO L246 CegarLoopForPetriNet]: Found error trace [2021-10-15 20:10:26,815 INFO L254 CegarLoopForPetriNet]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-15 20:10:26,852 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6733bad1-7ac1-4a5e-9834-1e392b9d29c2/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-10-15 20:10:27,029 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6733bad1-7ac1-4a5e-9834-1e392b9d29c2/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2021-10-15 20:10:27,029 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-15 20:10:27,029 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-15 20:10:27,030 INFO L82 PathProgramCache]: Analyzing trace with hash 1026769210, now seen corresponding path program 1 times [2021-10-15 20:10:27,030 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-15 20:10:27,030 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [619343849] [2021-10-15 20:10:27,030 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-15 20:10:27,030 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-15 20:10:27,060 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-15 20:10:27,091 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-10-15 20:10:27,091 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-15 20:10:27,091 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [619343849] [2021-10-15 20:10:27,092 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [619343849] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-15 20:10:27,092 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1858375921] [2021-10-15 20:10:27,092 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-15 20:10:27,092 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-15 20:10:27,092 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6733bad1-7ac1-4a5e-9834-1e392b9d29c2/bin/uautomizer-hJ6jxDFKc3/z3 [2021-10-15 20:10:27,093 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6733bad1-7ac1-4a5e-9834-1e392b9d29c2/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-15 20:10:27,127 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6733bad1-7ac1-4a5e-9834-1e392b9d29c2/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-10-15 20:10:27,276 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-15 20:10:27,278 INFO L263 TraceCheckSpWp]: Trace formula consists of 214 conjuncts, 5 conjunts are in the unsatisfiable core [2021-10-15 20:10:27,279 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-15 20:10:27,362 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 4 proven. 1 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-10-15 20:10:27,362 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1858375921] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-15 20:10:27,362 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-10-15 20:10:27,362 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 6 [2021-10-15 20:10:27,363 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [170752589] [2021-10-15 20:10:27,363 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-10-15 20:10:27,363 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-15 20:10:27,364 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-10-15 20:10:27,364 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-10-15 20:10:27,365 INFO L499 CegarLoopForPetriNet]: Number of universal loopers: 25 out of 43 [2021-10-15 20:10:27,365 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 59 places, 40 transitions, 190 flow. Second operand has 6 states, 6 states have (on average 27.5) internal successors, (165), 6 states have internal predecessors, (165), 0 states have call successors, (0), 0 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 20:10:27,365 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-10-15 20:10:27,365 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 25 of 43 [2021-10-15 20:10:27,366 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-10-15 20:10:27,401 INFO L129 PetriNetUnfolder]: 2/45 cut-off events. [2021-10-15 20:10:27,402 INFO L130 PetriNetUnfolder]: For 22/22 co-relation queries the response was YES. [2021-10-15 20:10:27,402 INFO L84 FinitePrefix]: Finished finitePrefix Result has 132 conditions, 45 events. 2/45 cut-off events. For 22/22 co-relation queries the response was YES. Maximal size of possible extension queue 2. Compared 9 event pairs, 0 based on Foata normal form. 1/46 useless extension candidates. Maximal degree in co-relation 118. Up to 8 conditions per place. [2021-10-15 20:10:27,402 INFO L132 encePairwiseOnDemand]: 36/43 looper letters, 9 selfloop transitions, 6 changer transitions 0/42 dead transitions. [2021-10-15 20:10:27,403 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 63 places, 42 transitions, 228 flow [2021-10-15 20:10:27,403 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-10-15 20:10:27,403 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5 states. [2021-10-15 20:10:27,404 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5 states to 5 states and 141 transitions. [2021-10-15 20:10:27,404 INFO L544 CegarLoopForPetriNet]: DFA transition density 0.6558139534883721 [2021-10-15 20:10:27,404 INFO L72 ComplementDD]: Start complementDD. Operand 5 states and 141 transitions. [2021-10-15 20:10:27,404 INFO L73 IsDeterministic]: Start isDeterministic. Operand 5 states and 141 transitions. [2021-10-15 20:10:27,405 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-10-15 20:10:27,405 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 5 states and 141 transitions. [2021-10-15 20:10:27,406 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 6 states, 5 states have (on average 28.2) internal successors, (141), 5 states have internal predecessors, (141), 0 states have call successors, (0), 0 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 20:10:27,406 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 6 states, 6 states have (on average 43.0) internal successors, (258), 6 states have internal predecessors, (258), 0 states have call successors, (0), 0 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 20:10:27,407 INFO L81 ComplementDD]: Finished complementDD. Result has 6 states, 6 states have (on average 43.0) internal successors, (258), 6 states have internal predecessors, (258), 0 states have call successors, (0), 0 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 20:10:27,407 INFO L186 Difference]: Start difference. First operand has 59 places, 40 transitions, 190 flow. Second operand 5 states and 141 transitions. [2021-10-15 20:10:27,407 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 63 places, 42 transitions, 228 flow [2021-10-15 20:10:27,408 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 58 places, 42 transitions, 216 flow, removed 0 selfloop flow, removed 5 redundant places. [2021-10-15 20:10:27,410 INFO L242 Difference]: Finished difference. Result has 59 places, 41 transitions, 202 flow [2021-10-15 20:10:27,410 INFO L317 CegarLoopForPetriNet]: {PETRI_ALPHABET=43, PETRI_DIFFERENCE_MINUEND_FLOW=178, PETRI_DIFFERENCE_MINUEND_PLACES=54, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=40, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=5, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=34, PETRI_DIFFERENCE_SUBTRAHEND_STATES=5, PETRI_FLOW=202, PETRI_PLACES=59, PETRI_TRANSITIONS=41} [2021-10-15 20:10:27,410 INFO L334 CegarLoopForPetriNet]: 22 programPoint places, 37 predicate places. [2021-10-15 20:10:27,410 INFO L470 AbstractCegarLoop]: Abstraction has has 59 places, 41 transitions, 202 flow [2021-10-15 20:10:27,411 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 27.5) internal successors, (165), 6 states have internal predecessors, (165), 0 states have call successors, (0), 0 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 20:10:27,411 INFO L246 CegarLoopForPetriNet]: Found error trace [2021-10-15 20:10:27,411 INFO L254 CegarLoopForPetriNet]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-15 20:10:27,449 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6733bad1-7ac1-4a5e-9834-1e392b9d29c2/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-10-15 20:10:27,621 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6733bad1-7ac1-4a5e-9834-1e392b9d29c2/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-10-15 20:10:27,621 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-15 20:10:27,621 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-15 20:10:27,622 INFO L82 PathProgramCache]: Analyzing trace with hash 1816728545, now seen corresponding path program 1 times [2021-10-15 20:10:27,622 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-15 20:10:27,622 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1933576928] [2021-10-15 20:10:27,622 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-15 20:10:27,622 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-15 20:10:27,701 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-15 20:10:28,361 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 2 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-15 20:10:28,361 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-15 20:10:28,361 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1933576928] [2021-10-15 20:10:28,362 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1933576928] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-15 20:10:28,362 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [843956365] [2021-10-15 20:10:28,362 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-15 20:10:28,362 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-15 20:10:28,362 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6733bad1-7ac1-4a5e-9834-1e392b9d29c2/bin/uautomizer-hJ6jxDFKc3/z3 [2021-10-15 20:10:28,369 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6733bad1-7ac1-4a5e-9834-1e392b9d29c2/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-15 20:10:28,371 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6733bad1-7ac1-4a5e-9834-1e392b9d29c2/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-10-15 20:10:28,577 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-15 20:10:28,579 INFO L263 TraceCheckSpWp]: Trace formula consists of 221 conjuncts, 74 conjunts are in the unsatisfiable core [2021-10-15 20:10:28,582 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-15 20:10:28,599 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-10-15 20:10:28,638 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-10-15 20:10:28,638 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 11 treesize of output 11 [2021-10-15 20:10:28,675 INFO L354 Elim1Store]: treesize reduction 27, result has 25.0 percent of original size [2021-10-15 20:10:28,675 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 18 treesize of output 19 [2021-10-15 20:10:28,737 INFO L354 Elim1Store]: treesize reduction 80, result has 19.2 percent of original size [2021-10-15 20:10:28,737 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 45 treesize of output 38 [2021-10-15 20:10:29,161 INFO L354 Elim1Store]: treesize reduction 130, result has 17.7 percent of original size [2021-10-15 20:10:29,162 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 53 treesize of output 44 [2021-10-15 20:10:29,585 INFO L354 Elim1Store]: treesize reduction 180, result has 18.2 percent of original size [2021-10-15 20:10:29,586 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 156 treesize of output 122 [2021-10-15 20:10:29,595 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 123 treesize of output 113 [2021-10-15 20:10:29,607 INFO L354 Elim1Store]: treesize reduction 53, result has 14.5 percent of original size [2021-10-15 20:10:29,608 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 113 treesize of output 91 [2021-10-15 20:10:30,013 INFO L354 Elim1Store]: treesize reduction 11, result has 8.3 percent of original size [2021-10-15 20:10:30,014 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 57 treesize of output 33 [2021-10-15 20:10:30,018 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 27 treesize of output 15 [2021-10-15 20:10:30,057 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 22 treesize of output 10 [2021-10-15 20:10:30,107 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 2 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-15 20:10:30,107 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [843956365] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-15 20:10:30,108 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-10-15 20:10:30,108 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 21] total 37 [2021-10-15 20:10:30,108 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2069713895] [2021-10-15 20:10:30,108 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 37 states [2021-10-15 20:10:30,109 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-15 20:10:30,109 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2021-10-15 20:10:30,110 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=86, Invalid=1246, Unknown=0, NotChecked=0, Total=1332 [2021-10-15 20:10:30,111 INFO L499 CegarLoopForPetriNet]: Number of universal loopers: 9 out of 43 [2021-10-15 20:10:30,112 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 59 places, 41 transitions, 202 flow. Second operand has 37 states, 37 states have (on average 10.64864864864865) internal successors, (394), 37 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 20:10:30,112 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-10-15 20:10:30,112 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 9 of 43 [2021-10-15 20:10:30,112 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-10-15 20:10:32,594 INFO L129 PetriNetUnfolder]: 2/49 cut-off events. [2021-10-15 20:10:32,594 INFO L130 PetriNetUnfolder]: For 15/15 co-relation queries the response was YES. [2021-10-15 20:10:32,595 INFO L84 FinitePrefix]: Finished finitePrefix Result has 174 conditions, 49 events. 2/49 cut-off events. For 15/15 co-relation queries the response was YES. Maximal size of possible extension queue 2. Compared 15 event pairs, 0 based on Foata normal form. 1/50 useless extension candidates. Maximal degree in co-relation 159. Up to 7 conditions per place. [2021-10-15 20:10:32,595 INFO L132 encePairwiseOnDemand]: 26/43 looper letters, 16 selfloop transitions, 24 changer transitions 2/46 dead transitions. [2021-10-15 20:10:32,595 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 84 places, 46 transitions, 306 flow [2021-10-15 20:10:32,596 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-10-15 20:10:32,596 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2021-10-15 20:10:32,598 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 277 transitions. [2021-10-15 20:10:32,599 INFO L544 CegarLoopForPetriNet]: DFA transition density 0.24776386404293382 [2021-10-15 20:10:32,599 INFO L72 ComplementDD]: Start complementDD. Operand 26 states and 277 transitions. [2021-10-15 20:10:32,599 INFO L73 IsDeterministic]: Start isDeterministic. Operand 26 states and 277 transitions. [2021-10-15 20:10:32,599 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-10-15 20:10:32,600 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 26 states and 277 transitions. [2021-10-15 20:10:32,601 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 27 states, 26 states have (on average 10.653846153846153) internal successors, (277), 26 states have internal predecessors, (277), 0 states have call successors, (0), 0 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 20:10:32,605 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 27 states, 27 states have (on average 43.0) internal successors, (1161), 27 states have internal predecessors, (1161), 0 states have call successors, (0), 0 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 20:10:32,606 INFO L81 ComplementDD]: Finished complementDD. Result has 27 states, 27 states have (on average 43.0) internal successors, (1161), 27 states have internal predecessors, (1161), 0 states have call successors, (0), 0 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 20:10:32,606 INFO L186 Difference]: Start difference. First operand has 59 places, 41 transitions, 202 flow. Second operand 26 states and 277 transitions. [2021-10-15 20:10:32,606 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 84 places, 46 transitions, 306 flow [2021-10-15 20:10:32,607 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 81 places, 46 transitions, 290 flow, removed 3 selfloop flow, removed 3 redundant places. [2021-10-15 20:10:32,609 INFO L242 Difference]: Finished difference. Result has 84 places, 42 transitions, 252 flow [2021-10-15 20:10:32,610 INFO L317 CegarLoopForPetriNet]: {PETRI_ALPHABET=43, PETRI_DIFFERENCE_MINUEND_FLOW=186, PETRI_DIFFERENCE_MINUEND_PLACES=56, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=41, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=23, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=17, PETRI_DIFFERENCE_SUBTRAHEND_STATES=26, PETRI_FLOW=252, PETRI_PLACES=84, PETRI_TRANSITIONS=42} [2021-10-15 20:10:32,610 INFO L334 CegarLoopForPetriNet]: 22 programPoint places, 62 predicate places. [2021-10-15 20:10:32,610 INFO L470 AbstractCegarLoop]: Abstraction has has 84 places, 42 transitions, 252 flow [2021-10-15 20:10:32,610 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 37 states, 37 states have (on average 10.64864864864865) internal successors, (394), 37 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 20:10:32,611 INFO L246 CegarLoopForPetriNet]: Found error trace [2021-10-15 20:10:32,611 INFO L254 CegarLoopForPetriNet]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-15 20:10:32,650 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6733bad1-7ac1-4a5e-9834-1e392b9d29c2/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-10-15 20:10:32,837 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6733bad1-7ac1-4a5e-9834-1e392b9d29c2/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-10-15 20:10:32,837 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-15 20:10:32,837 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-15 20:10:32,838 INFO L82 PathProgramCache]: Analyzing trace with hash 535664154, now seen corresponding path program 2 times [2021-10-15 20:10:32,838 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-15 20:10:32,838 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [409654320] [2021-10-15 20:10:32,838 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-15 20:10:32,838 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-15 20:10:32,869 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-15 20:10:32,906 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 7 proven. 3 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-10-15 20:10:32,906 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-15 20:10:32,906 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [409654320] [2021-10-15 20:10:32,907 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [409654320] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-15 20:10:32,907 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1702891278] [2021-10-15 20:10:32,907 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-10-15 20:10:32,907 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-15 20:10:32,907 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6733bad1-7ac1-4a5e-9834-1e392b9d29c2/bin/uautomizer-hJ6jxDFKc3/z3 [2021-10-15 20:10:32,908 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6733bad1-7ac1-4a5e-9834-1e392b9d29c2/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-15 20:10:32,929 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6733bad1-7ac1-4a5e-9834-1e392b9d29c2/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-10-15 20:10:33,156 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-10-15 20:10:33,156 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-15 20:10:33,158 INFO L263 TraceCheckSpWp]: Trace formula consists of 228 conjuncts, 6 conjunts are in the unsatisfiable core [2021-10-15 20:10:33,160 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-15 20:10:33,283 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 7 proven. 2 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-10-15 20:10:33,283 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1702891278] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-15 20:10:33,284 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-10-15 20:10:33,284 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 7 [2021-10-15 20:10:33,284 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [421939550] [2021-10-15 20:10:33,285 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-10-15 20:10:33,285 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-15 20:10:33,286 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-10-15 20:10:33,286 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2021-10-15 20:10:33,286 INFO L499 CegarLoopForPetriNet]: Number of universal loopers: 25 out of 43 [2021-10-15 20:10:33,287 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 84 places, 42 transitions, 252 flow. Second operand has 7 states, 7 states have (on average 28.285714285714285) internal successors, (198), 7 states have internal predecessors, (198), 0 states have call successors, (0), 0 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 20:10:33,287 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-10-15 20:10:33,287 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 25 of 43 [2021-10-15 20:10:33,287 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-10-15 20:10:33,349 INFO L129 PetriNetUnfolder]: 1/40 cut-off events. [2021-10-15 20:10:33,349 INFO L130 PetriNetUnfolder]: For 22/22 co-relation queries the response was YES. [2021-10-15 20:10:33,349 INFO L84 FinitePrefix]: Finished finitePrefix Result has 143 conditions, 40 events. 1/40 cut-off events. For 22/22 co-relation queries the response was YES. Maximal size of possible extension queue 2. Compared 8 event pairs, 0 based on Foata normal form. 1/41 useless extension candidates. Maximal degree in co-relation 125. Up to 4 conditions per place. [2021-10-15 20:10:33,350 INFO L132 encePairwiseOnDemand]: 36/43 looper letters, 0 selfloop transitions, 0 changer transitions 37/37 dead transitions. [2021-10-15 20:10:33,350 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 87 places, 37 transitions, 243 flow [2021-10-15 20:10:33,350 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-10-15 20:10:33,350 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 8 states. [2021-10-15 20:10:33,351 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8 states to 8 states and 215 transitions. [2021-10-15 20:10:33,352 INFO L544 CegarLoopForPetriNet]: DFA transition density 0.625 [2021-10-15 20:10:33,352 INFO L72 ComplementDD]: Start complementDD. Operand 8 states and 215 transitions. [2021-10-15 20:10:33,352 INFO L73 IsDeterministic]: Start isDeterministic. Operand 8 states and 215 transitions. [2021-10-15 20:10:33,352 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-10-15 20:10:33,353 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 8 states and 215 transitions. [2021-10-15 20:10:33,353 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 9 states, 8 states have (on average 26.875) internal successors, (215), 8 states have internal predecessors, (215), 0 states have call successors, (0), 0 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 20:10:33,355 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 9 states, 9 states have (on average 43.0) internal successors, (387), 9 states have internal predecessors, (387), 0 states have call successors, (0), 0 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 20:10:33,356 INFO L81 ComplementDD]: Finished complementDD. Result has 9 states, 9 states have (on average 43.0) internal successors, (387), 9 states have internal predecessors, (387), 0 states have call successors, (0), 0 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 20:10:33,356 INFO L186 Difference]: Start difference. First operand has 84 places, 42 transitions, 252 flow. Second operand 8 states and 215 transitions. [2021-10-15 20:10:33,356 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 87 places, 37 transitions, 243 flow [2021-10-15 20:10:33,358 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 57 places, 37 transitions, 174 flow, removed 0 selfloop flow, removed 30 redundant places. [2021-10-15 20:10:33,358 INFO L242 Difference]: Finished difference. Result has 57 places, 0 transitions, 0 flow [2021-10-15 20:10:33,358 INFO L317 CegarLoopForPetriNet]: {PETRI_ALPHABET=43, PETRI_DIFFERENCE_MINUEND_FLOW=142, PETRI_DIFFERENCE_MINUEND_PLACES=50, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=36, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=0, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=36, PETRI_DIFFERENCE_SUBTRAHEND_STATES=8, PETRI_FLOW=0, PETRI_PLACES=57, PETRI_TRANSITIONS=0} [2021-10-15 20:10:33,359 INFO L334 CegarLoopForPetriNet]: 22 programPoint places, 35 predicate places. [2021-10-15 20:10:33,359 INFO L470 AbstractCegarLoop]: Abstraction has has 57 places, 0 transitions, 0 flow [2021-10-15 20:10:33,359 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 28.285714285714285) internal successors, (198), 7 states have internal predecessors, (198), 0 states have call successors, (0), 0 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 20:10:33,362 INFO L764 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION [2021-10-15 20:10:33,397 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6733bad1-7ac1-4a5e-9834-1e392b9d29c2/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-10-15 20:10:33,577 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6733bad1-7ac1-4a5e-9834-1e392b9d29c2/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-10-15 20:10:33,582 INFO L179 ceAbstractionStarter]: Computing trace abstraction results [2021-10-15 20:10:33,587 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 15.10 08:10:33 BoogieIcfgContainer [2021-10-15 20:10:33,587 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-10-15 20:10:33,588 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2021-10-15 20:10:33,588 INFO L271 PluginConnector]: Initializing Witness Printer... [2021-10-15 20:10:33,589 INFO L275 PluginConnector]: Witness Printer initialized [2021-10-15 20:10:33,589 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 15.10 08:10:17" (3/4) ... [2021-10-15 20:10:33,593 INFO L137 WitnessPrinter]: Generating witness for correct program [2021-10-15 20:10:33,607 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 9 nodes and edges [2021-10-15 20:10:33,608 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 6 nodes and edges [2021-10-15 20:10:33,608 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 1 nodes and edges [2021-10-15 20:10:33,608 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 1 nodes and edges [2021-10-15 20:10:33,651 INFO L141 WitnessManager]: Wrote witness to /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6733bad1-7ac1-4a5e-9834-1e392b9d29c2/bin/uautomizer-hJ6jxDFKc3/witness.graphml [2021-10-15 20:10:33,656 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2021-10-15 20:10:33,657 INFO L168 Benchmark]: Toolchain (without parser) took 17837.68 ms. Allocated memory was 88.1 MB in the beginning and 176.2 MB in the end (delta: 88.1 MB). Free memory was 51.1 MB in the beginning and 52.7 MB in the end (delta: -1.6 MB). Peak memory consumption was 86.8 MB. Max. memory is 16.1 GB. [2021-10-15 20:10:33,658 INFO L168 Benchmark]: CDTParser took 0.33 ms. Allocated memory is still 88.1 MB. Free memory is still 69.2 MB. There was no memory consumed. Max. memory is 16.1 GB. [2021-10-15 20:10:33,659 INFO L168 Benchmark]: CACSL2BoogieTranslator took 593.24 ms. Allocated memory was 88.1 MB in the beginning and 121.6 MB in the end (delta: 33.6 MB). Free memory was 50.8 MB in the beginning and 90.6 MB in the end (delta: -39.8 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. [2021-10-15 20:10:33,659 INFO L168 Benchmark]: Boogie Procedure Inliner took 61.69 ms. Allocated memory is still 121.6 MB. Free memory was 90.6 MB in the beginning and 88.6 MB in the end (delta: 2.0 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2021-10-15 20:10:33,659 INFO L168 Benchmark]: Boogie Preprocessor took 42.77 ms. Allocated memory is still 121.6 MB. Free memory was 88.6 MB in the beginning and 86.5 MB in the end (delta: 2.0 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2021-10-15 20:10:33,660 INFO L168 Benchmark]: RCFGBuilder took 552.45 ms. Allocated memory is still 121.6 MB. Free memory was 86.5 MB in the beginning and 74.0 MB in the end (delta: 12.5 MB). Peak memory consumption was 12.6 MB. Max. memory is 16.1 GB. [2021-10-15 20:10:33,660 INFO L168 Benchmark]: TraceAbstraction took 16512.88 ms. Allocated memory was 121.6 MB in the beginning and 176.2 MB in the end (delta: 54.5 MB). Free memory was 73.2 MB in the beginning and 55.9 MB in the end (delta: 17.3 MB). Peak memory consumption was 74.5 MB. Max. memory is 16.1 GB. [2021-10-15 20:10:33,661 INFO L168 Benchmark]: Witness Printer took 68.04 ms. Allocated memory is still 176.2 MB. Free memory was 55.9 MB in the beginning and 52.7 MB in the end (delta: 3.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2021-10-15 20:10:33,663 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.33 ms. Allocated memory is still 88.1 MB. Free memory is still 69.2 MB. There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 593.24 ms. Allocated memory was 88.1 MB in the beginning and 121.6 MB in the end (delta: 33.6 MB). Free memory was 50.8 MB in the beginning and 90.6 MB in the end (delta: -39.8 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. * Boogie Procedure Inliner took 61.69 ms. Allocated memory is still 121.6 MB. Free memory was 90.6 MB in the beginning and 88.6 MB in the end (delta: 2.0 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * Boogie Preprocessor took 42.77 ms. Allocated memory is still 121.6 MB. Free memory was 88.6 MB in the beginning and 86.5 MB in the end (delta: 2.0 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * RCFGBuilder took 552.45 ms. Allocated memory is still 121.6 MB. Free memory was 86.5 MB in the beginning and 74.0 MB in the end (delta: 12.5 MB). Peak memory consumption was 12.6 MB. Max. memory is 16.1 GB. * TraceAbstraction took 16512.88 ms. Allocated memory was 121.6 MB in the beginning and 176.2 MB in the end (delta: 54.5 MB). Free memory was 73.2 MB in the beginning and 55.9 MB in the end (delta: 17.3 MB). Peak memory consumption was 74.5 MB. Max. memory is 16.1 GB. * Witness Printer took 68.04 ms. Allocated memory is still 176.2 MB. Free memory was 55.9 MB in the beginning and 52.7 MB in the end (delta: 3.1 MB). Peak memory consumption was 2.1 MB. 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 - PositiveResult [Line: 641]: call to reach_error is unreachable For all program executions holds that call to reach_error is unreachable at this location - StatisticsResult: Ultimate Automizer benchmark data CFG has 1 procedures, 29 locations, 1 error locations. Started 1 CEGAR loops. EmptinessCheckTime: 6.0ms, RemoveRedundantFlowTime: 0.0ms, RemoveRedundantFlowUnfoldingTime: 0.0ms, BackfoldingTime: 0.0ms, BackfoldingUnfoldingTime: 0.0ms, FlowIncreaseByBackfolding: 0, BasicCegarLoop: OverallTime: 16442.2ms, OverallIterations: 15, TraceHistogramMax: 3, EmptinessCheckTime: 0.0ms, AutomataDifference: 5764.3ms, DeadEndRemovalTime: 0.0ms, HoareAnnotationTime: 0.0ms, InitialAbstractionConstructionTime: 46.9ms, PartialOrderReductionTime: 0.0ms, HoareTripleCheckerStatistics: 66 SDtfs, 414 SDslu, 343 SDs, 0 SdLazy, 1826 SolverSat, 248 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 1667.3ms Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 473 GetRequests, 289 SyntacticMatches, 4 SemanticMatches, 180 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1573 ImplicationChecksByTransitivity, 5365.4ms Time, 0.0ms BasicInterpolantAutomatonTime, BiggestAbstraction: size=396occurred in iteration=8, InterpolantAutomatonStates: 119, 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: 200.6ms SsaConstructionTime, 893.2ms SatisfiabilityAnalysisTime, 5980.5ms InterpolantComputationTime, 762 NumberOfCodeBlocks, 748 NumberOfCodeBlocksAsserted, 29 NumberOfCheckSat, 737 ConstructedInterpolants, 22 QuantifiedInterpolants, 4171 SizeOfPredicates, 84 NumberOfNonLiveVariables, 1749 ConjunctsInSsa, 182 ConjunctsInUnsatCore, 25 InterpolantComputations, 7 PerfectInterpolantSequences, 276/375 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 - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold RESULT: Ultimate proved your program to be correct! [2021-10-15 20:10:33,717 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6733bad1-7ac1-4a5e-9834-1e392b9d29c2/bin/uautomizer-hJ6jxDFKc3/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Forceful destruction successful, exit code 0 Received shutdown request...