./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/recursive/Ackermann02.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 63182f13 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f7905ba-f70f-4e28-a2dd-cff410e98a20/bin/uautomizer-YU5uOKAj3y/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f7905ba-f70f-4e28-a2dd-cff410e98a20/bin/uautomizer-YU5uOKAj3y/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f7905ba-f70f-4e28-a2dd-cff410e98a20/bin/uautomizer-YU5uOKAj3y/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f7905ba-f70f-4e28-a2dd-cff410e98a20/bin/uautomizer-YU5uOKAj3y/config/AutomizerReach.xml -i ../../sv-benchmarks/c/recursive/Ackermann02.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f7905ba-f70f-4e28-a2dd-cff410e98a20/bin/uautomizer-YU5uOKAj3y/config/svcomp-Reach-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f7905ba-f70f-4e28-a2dd-cff410e98a20/bin/uautomizer-YU5uOKAj3y --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 20c02b81d1b1bc312ccc75d6e9b31c6252d69e8a6e2560afe3a2a95a3e53102a --- Real Ultimate output --- This is Ultimate 0.2.1-dev-63182f1 [2021-11-13 18:36:08,702 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-13 18:36:08,704 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-13 18:36:08,762 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-13 18:36:08,762 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-13 18:36:08,767 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-13 18:36:08,769 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-13 18:36:08,773 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-13 18:36:08,775 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-13 18:36:08,781 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-13 18:36:08,782 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-13 18:36:08,784 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-13 18:36:08,784 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-13 18:36:08,787 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-13 18:36:08,789 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-13 18:36:08,794 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-13 18:36:08,796 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-13 18:36:08,797 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-13 18:36:08,799 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-13 18:36:08,807 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-13 18:36:08,809 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-13 18:36:08,811 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-13 18:36:08,816 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-13 18:36:08,818 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-13 18:36:08,827 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-13 18:36:08,828 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-13 18:36:08,828 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-13 18:36:08,831 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-13 18:36:08,832 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-13 18:36:08,833 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-13 18:36:08,834 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-13 18:36:08,835 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-13 18:36:08,837 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-13 18:36:08,839 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-13 18:36:08,841 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-13 18:36:08,841 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-13 18:36:08,842 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-13 18:36:08,843 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-13 18:36:08,843 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-13 18:36:08,844 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-13 18:36:08,845 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-13 18:36:08,847 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f7905ba-f70f-4e28-a2dd-cff410e98a20/bin/uautomizer-YU5uOKAj3y/config/svcomp-Reach-32bit-Automizer_Default.epf [2021-11-13 18:36:08,876 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-13 18:36:08,876 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-13 18:36:08,876 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-13 18:36:08,876 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-13 18:36:08,877 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-13 18:36:08,877 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-13 18:36:08,878 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-11-13 18:36:08,878 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-11-13 18:36:08,878 INFO L138 SettingsManager]: * Use SBE=true [2021-11-13 18:36:08,879 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-13 18:36:08,879 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-13 18:36:08,879 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-13 18:36:08,879 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-13 18:36:08,879 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-13 18:36:08,880 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-13 18:36:08,880 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-13 18:36:08,880 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-13 18:36:08,880 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-13 18:36:08,880 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-13 18:36:08,880 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-13 18:36:08,881 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-13 18:36:08,881 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-13 18:36:08,881 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-11-13 18:36:08,881 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-13 18:36:08,881 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-13 18:36:08,882 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-13 18:36:08,882 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-13 18:36:08,882 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-13 18:36:08,883 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-11-13 18:36:08,884 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-13 18:36:08,885 INFO L138 SettingsManager]: * Large block encoding in concurrent analysis=OFF [2021-11-13 18:36:08,885 INFO L138 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2021-11-13 18:36:08,885 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-13 18:36:08,885 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-13 18:36:08,886 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_2f7905ba-f70f-4e28-a2dd-cff410e98a20/bin/uautomizer-YU5uOKAj3y/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f7905ba-f70f-4e28-a2dd-cff410e98a20/bin/uautomizer-YU5uOKAj3y Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 20c02b81d1b1bc312ccc75d6e9b31c6252d69e8a6e2560afe3a2a95a3e53102a [2021-11-13 18:36:09,202 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-13 18:36:09,227 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-13 18:36:09,229 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-13 18:36:09,231 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-13 18:36:09,231 INFO L275 PluginConnector]: CDTParser initialized [2021-11-13 18:36:09,233 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f7905ba-f70f-4e28-a2dd-cff410e98a20/bin/uautomizer-YU5uOKAj3y/../../sv-benchmarks/c/recursive/Ackermann02.c [2021-11-13 18:36:09,301 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f7905ba-f70f-4e28-a2dd-cff410e98a20/bin/uautomizer-YU5uOKAj3y/data/b04e18ed3/a05b1292856d4bb48ec741b6b8dff1c9/FLAGf2f69ce4a [2021-11-13 18:36:09,787 INFO L306 CDTParser]: Found 1 translation units. [2021-11-13 18:36:09,788 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f7905ba-f70f-4e28-a2dd-cff410e98a20/sv-benchmarks/c/recursive/Ackermann02.c [2021-11-13 18:36:09,799 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f7905ba-f70f-4e28-a2dd-cff410e98a20/bin/uautomizer-YU5uOKAj3y/data/b04e18ed3/a05b1292856d4bb48ec741b6b8dff1c9/FLAGf2f69ce4a [2021-11-13 18:36:10,163 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f7905ba-f70f-4e28-a2dd-cff410e98a20/bin/uautomizer-YU5uOKAj3y/data/b04e18ed3/a05b1292856d4bb48ec741b6b8dff1c9 [2021-11-13 18:36:10,165 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-13 18:36:10,166 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-13 18:36:10,168 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-13 18:36:10,168 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-13 18:36:10,172 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-13 18:36:10,173 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 13.11 06:36:10" (1/1) ... [2021-11-13 18:36:10,175 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@33fee9db and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 06:36:10, skipping insertion in model container [2021-11-13 18:36:10,175 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 13.11 06:36:10" (1/1) ... [2021-11-13 18:36:10,188 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-13 18:36:10,208 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-13 18:36:10,380 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_2f7905ba-f70f-4e28-a2dd-cff410e98a20/sv-benchmarks/c/recursive/Ackermann02.c[1157,1170] [2021-11-13 18:36:10,383 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-13 18:36:10,394 INFO L203 MainTranslator]: Completed pre-run [2021-11-13 18:36:10,410 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_2f7905ba-f70f-4e28-a2dd-cff410e98a20/sv-benchmarks/c/recursive/Ackermann02.c[1157,1170] [2021-11-13 18:36:10,411 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-13 18:36:10,425 INFO L208 MainTranslator]: Completed translation [2021-11-13 18:36:10,425 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 06:36:10 WrapperNode [2021-11-13 18:36:10,425 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-13 18:36:10,427 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-13 18:36:10,427 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-13 18:36:10,427 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-13 18:36:10,436 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 06:36:10" (1/1) ... [2021-11-13 18:36:10,442 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 06:36:10" (1/1) ... [2021-11-13 18:36:10,461 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-13 18:36:10,462 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-13 18:36:10,462 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-13 18:36:10,462 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-13 18:36:10,471 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 06:36:10" (1/1) ... [2021-11-13 18:36:10,471 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 06:36:10" (1/1) ... [2021-11-13 18:36:10,472 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 06:36:10" (1/1) ... [2021-11-13 18:36:10,473 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 06:36:10" (1/1) ... [2021-11-13 18:36:10,477 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 06:36:10" (1/1) ... [2021-11-13 18:36:10,479 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 06:36:10" (1/1) ... [2021-11-13 18:36:10,480 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 06:36:10" (1/1) ... [2021-11-13 18:36:10,482 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-13 18:36:10,483 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-13 18:36:10,483 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-13 18:36:10,483 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-13 18:36:10,484 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 06:36:10" (1/1) ... [2021-11-13 18:36:10,492 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-13 18:36:10,505 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f7905ba-f70f-4e28-a2dd-cff410e98a20/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 18:36:10,520 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f7905ba-f70f-4e28-a2dd-cff410e98a20/bin/uautomizer-YU5uOKAj3y/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-13 18:36:10,550 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f7905ba-f70f-4e28-a2dd-cff410e98a20/bin/uautomizer-YU5uOKAj3y/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-13 18:36:10,566 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-13 18:36:10,567 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-13 18:36:10,567 INFO L130 BoogieDeclarations]: Found specification of procedure ackermann [2021-11-13 18:36:10,567 INFO L138 BoogieDeclarations]: Found implementation of procedure ackermann [2021-11-13 18:36:10,567 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-13 18:36:10,567 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-13 18:36:10,774 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-13 18:36:10,774 INFO L299 CfgBuilder]: Removed 0 assume(true) statements. [2021-11-13 18:36:10,777 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 13.11 06:36:10 BoogieIcfgContainer [2021-11-13 18:36:10,777 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-13 18:36:10,779 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-13 18:36:10,779 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-13 18:36:10,783 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-13 18:36:10,784 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 13.11 06:36:10" (1/3) ... [2021-11-13 18:36:10,785 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@324818a6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 13.11 06:36:10, skipping insertion in model container [2021-11-13 18:36:10,785 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 06:36:10" (2/3) ... [2021-11-13 18:36:10,785 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@324818a6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 13.11 06:36:10, skipping insertion in model container [2021-11-13 18:36:10,785 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 13.11 06:36:10" (3/3) ... [2021-11-13 18:36:10,787 INFO L111 eAbstractionObserver]: Analyzing ICFG Ackermann02.c [2021-11-13 18:36:10,793 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-13 18:36:10,794 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-13 18:36:10,847 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-13 18:36:10,860 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=PETRI_NET, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-13 18:36:10,874 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-13 18:36:10,905 INFO L276 IsEmpty]: Start isEmpty. Operand has 23 states, 16 states have (on average 1.375) internal successors, (22), 17 states have internal predecessors, (22), 4 states have call successors, (4), 1 states have call predecessors, (4), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-11-13 18:36:10,911 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-11-13 18:36:10,926 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 18:36:10,927 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 18:36:10,928 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 18:36:10,933 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 18:36:10,934 INFO L85 PathProgramCache]: Analyzing trace with hash 1470704041, now seen corresponding path program 1 times [2021-11-13 18:36:10,943 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 18:36:10,952 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [456140020] [2021-11-13 18:36:10,953 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 18:36:10,954 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 18:36:11,105 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:36:11,246 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 4 [2021-11-13 18:36:11,258 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:36:11,316 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 18:36:11,322 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 18:36:11,323 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [456140020] [2021-11-13 18:36:11,324 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [456140020] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-13 18:36:11,324 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-13 18:36:11,324 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-13 18:36:11,326 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [912765819] [2021-11-13 18:36:11,327 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-13 18:36:11,335 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-13 18:36:11,336 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 18:36:11,380 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-13 18:36:11,382 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-13 18:36:11,385 INFO L87 Difference]: Start difference. First operand has 23 states, 16 states have (on average 1.375) internal successors, (22), 17 states have internal predecessors, (22), 4 states have call successors, (4), 1 states have call predecessors, (4), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Second operand has 5 states, 5 states have (on average 2.0) internal successors, (10), 5 states have internal predecessors, (10), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 18:36:11,524 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 18:36:11,547 INFO L93 Difference]: Finished difference Result 51 states and 72 transitions. [2021-11-13 18:36:11,549 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-13 18:36:11,550 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.0) internal successors, (10), 5 states have internal predecessors, (10), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 12 [2021-11-13 18:36:11,552 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 18:36:11,562 INFO L225 Difference]: With dead ends: 51 [2021-11-13 18:36:11,562 INFO L226 Difference]: Without dead ends: 25 [2021-11-13 18:36:11,568 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-13 18:36:11,575 INFO L933 BasicCegarLoop]: 25 mSDtfsCounter, 15 mSDsluCounter, 48 mSDsCounter, 0 mSdLazyCounter, 40 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 57.86ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 21 SdHoareTripleChecker+Valid, 73 SdHoareTripleChecker+Invalid, 44 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 8.66ms SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 40 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 74.28ms IncrementalHoareTripleChecker+Time [2021-11-13 18:36:11,577 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [21 Valid, 73 Invalid, 44 Unknown, 0 Unchecked, 8.66ms Time], IncrementalHoareTripleChecker [4 Valid, 40 Invalid, 0 Unknown, 0 Unchecked, 74.28ms Time] [2021-11-13 18:36:11,614 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2021-11-13 18:36:11,661 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2021-11-13 18:36:11,662 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 17 states have (on average 1.1176470588235294) internal successors, (19), 17 states have internal predecessors, (19), 5 states have call successors, (5), 1 states have call predecessors, (5), 2 states have return successors, (8), 6 states have call predecessors, (8), 5 states have call successors, (8) [2021-11-13 18:36:11,665 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 32 transitions. [2021-11-13 18:36:11,667 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 32 transitions. Word has length 12 [2021-11-13 18:36:11,668 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 18:36:11,668 INFO L470 AbstractCegarLoop]: Abstraction has 25 states and 32 transitions. [2021-11-13 18:36:11,669 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.0) internal successors, (10), 5 states have internal predecessors, (10), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 18:36:11,670 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 32 transitions. [2021-11-13 18:36:11,673 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-11-13 18:36:11,674 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 18:36:11,674 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 18:36:11,675 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-13 18:36:11,676 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 18:36:11,680 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 18:36:11,681 INFO L85 PathProgramCache]: Analyzing trace with hash 941922339, now seen corresponding path program 1 times [2021-11-13 18:36:11,681 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 18:36:11,682 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [212086727] [2021-11-13 18:36:11,682 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 18:36:11,683 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 18:36:11,729 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:36:11,794 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 4 [2021-11-13 18:36:11,812 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:36:11,854 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-11-13 18:36:11,857 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:36:11,875 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-13 18:36:11,877 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 18:36:11,877 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [212086727] [2021-11-13 18:36:11,878 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [212086727] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 18:36:11,879 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [884987582] [2021-11-13 18:36:11,879 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 18:36:11,880 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 18:36:11,880 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f7905ba-f70f-4e28-a2dd-cff410e98a20/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 18:36:11,887 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f7905ba-f70f-4e28-a2dd-cff410e98a20/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 18:36:11,912 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f7905ba-f70f-4e28-a2dd-cff410e98a20/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-13 18:36:11,983 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:36:11,986 INFO L263 TraceCheckSpWp]: Trace formula consists of 85 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-13 18:36:11,991 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 18:36:12,200 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-13 18:36:12,201 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 18:36:12,464 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-13 18:36:12,465 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [884987582] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 18:36:12,465 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 18:36:12,465 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 7] total 10 [2021-11-13 18:36:12,466 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [747985334] [2021-11-13 18:36:12,467 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 18:36:12,468 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-13 18:36:12,468 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 18:36:12,483 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-13 18:36:12,483 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=60, Unknown=0, NotChecked=0, Total=90 [2021-11-13 18:36:12,484 INFO L87 Difference]: Start difference. First operand 25 states and 32 transitions. Second operand has 10 states, 10 states have (on average 2.4) internal successors, (24), 10 states have internal predecessors, (24), 4 states have call successors, (4), 1 states have call predecessors, (4), 3 states have return successors, (4), 2 states have call predecessors, (4), 4 states have call successors, (4) [2021-11-13 18:36:12,664 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 18:36:12,664 INFO L93 Difference]: Finished difference Result 57 states and 91 transitions. [2021-11-13 18:36:12,665 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-13 18:36:12,665 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.4) internal successors, (24), 10 states have internal predecessors, (24), 4 states have call successors, (4), 1 states have call predecessors, (4), 3 states have return successors, (4), 2 states have call predecessors, (4), 4 states have call successors, (4) Word has length 19 [2021-11-13 18:36:12,666 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 18:36:12,667 INFO L225 Difference]: With dead ends: 57 [2021-11-13 18:36:12,668 INFO L226 Difference]: Without dead ends: 30 [2021-11-13 18:36:12,670 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 36 SyntacticMatches, 1 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=57, Invalid=99, Unknown=0, NotChecked=0, Total=156 [2021-11-13 18:36:12,672 INFO L933 BasicCegarLoop]: 22 mSDtfsCounter, 27 mSDsluCounter, 54 mSDsCounter, 0 mSdLazyCounter, 69 mSolverCounterSat, 29 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 109.96ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 35 SdHoareTripleChecker+Valid, 76 SdHoareTripleChecker+Invalid, 98 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 3.90ms SdHoareTripleChecker+Time, 29 IncrementalHoareTripleChecker+Valid, 69 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 135.55ms IncrementalHoareTripleChecker+Time [2021-11-13 18:36:12,672 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [35 Valid, 76 Invalid, 98 Unknown, 0 Unchecked, 3.90ms Time], IncrementalHoareTripleChecker [29 Valid, 69 Invalid, 0 Unknown, 0 Unchecked, 135.55ms Time] [2021-11-13 18:36:12,674 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2021-11-13 18:36:12,681 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2021-11-13 18:36:12,681 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 21 states have (on average 1.0952380952380953) internal successors, (23), 20 states have internal predecessors, (23), 5 states have call successors, (5), 2 states have call predecessors, (5), 3 states have return successors, (10), 7 states have call predecessors, (10), 5 states have call successors, (10) [2021-11-13 18:36:12,683 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 38 transitions. [2021-11-13 18:36:12,683 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 38 transitions. Word has length 19 [2021-11-13 18:36:12,684 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 18:36:12,684 INFO L470 AbstractCegarLoop]: Abstraction has 30 states and 38 transitions. [2021-11-13 18:36:12,684 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 2.4) internal successors, (24), 10 states have internal predecessors, (24), 4 states have call successors, (4), 1 states have call predecessors, (4), 3 states have return successors, (4), 2 states have call predecessors, (4), 4 states have call successors, (4) [2021-11-13 18:36:12,684 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 38 transitions. [2021-11-13 18:36:12,686 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-11-13 18:36:12,686 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 18:36:12,687 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 18:36:12,722 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f7905ba-f70f-4e28-a2dd-cff410e98a20/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-13 18:36:12,905 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f7905ba-f70f-4e28-a2dd-cff410e98a20/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2021-11-13 18:36:12,906 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 18:36:12,906 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 18:36:12,906 INFO L85 PathProgramCache]: Analyzing trace with hash -952852693, now seen corresponding path program 2 times [2021-11-13 18:36:12,907 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 18:36:12,907 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [53454074] [2021-11-13 18:36:12,907 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 18:36:12,907 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 18:36:12,924 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:36:12,941 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 4 [2021-11-13 18:36:12,948 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:36:12,958 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-11-13 18:36:12,963 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:36:12,980 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-11-13 18:36:12,983 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:36:12,988 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 10 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-13 18:36:12,988 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 18:36:12,988 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [53454074] [2021-11-13 18:36:12,989 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [53454074] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 18:36:12,989 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [517928818] [2021-11-13 18:36:12,989 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-13 18:36:12,989 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 18:36:12,990 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f7905ba-f70f-4e28-a2dd-cff410e98a20/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 18:36:12,991 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f7905ba-f70f-4e28-a2dd-cff410e98a20/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 18:36:13,002 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f7905ba-f70f-4e28-a2dd-cff410e98a20/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-13 18:36:13,044 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-13 18:36:13,044 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 18:36:13,046 INFO L263 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-13 18:36:13,048 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 18:36:13,163 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 10 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-13 18:36:13,164 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 18:36:13,338 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 10 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-13 18:36:13,338 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [517928818] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 18:36:13,338 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 18:36:13,339 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 7 [2021-11-13 18:36:13,339 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [619172234] [2021-11-13 18:36:13,339 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 18:36:13,340 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-13 18:36:13,340 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 18:36:13,341 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-13 18:36:13,341 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-11-13 18:36:13,342 INFO L87 Difference]: Start difference. First operand 30 states and 38 transitions. Second operand has 7 states, 7 states have (on average 3.857142857142857) internal successors, (27), 7 states have internal predecessors, (27), 3 states have call successors, (4), 1 states have call predecessors, (4), 4 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) [2021-11-13 18:36:13,418 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 18:36:13,418 INFO L93 Difference]: Finished difference Result 59 states and 86 transitions. [2021-11-13 18:36:13,419 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-13 18:36:13,419 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 3.857142857142857) internal successors, (27), 7 states have internal predecessors, (27), 3 states have call successors, (4), 1 states have call predecessors, (4), 4 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) Word has length 26 [2021-11-13 18:36:13,420 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 18:36:13,427 INFO L225 Difference]: With dead ends: 59 [2021-11-13 18:36:13,427 INFO L226 Difference]: Without dead ends: 34 [2021-11-13 18:36:13,433 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 55 SyntacticMatches, 1 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=24, Invalid=32, Unknown=0, NotChecked=0, Total=56 [2021-11-13 18:36:13,436 INFO L933 BasicCegarLoop]: 18 mSDtfsCounter, 7 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 30 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 23.94ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 40 SdHoareTripleChecker+Invalid, 31 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 2.94ms SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 30 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 30.31ms IncrementalHoareTripleChecker+Time [2021-11-13 18:36:13,438 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 40 Invalid, 31 Unknown, 0 Unchecked, 2.94ms Time], IncrementalHoareTripleChecker [1 Valid, 30 Invalid, 0 Unknown, 0 Unchecked, 30.31ms Time] [2021-11-13 18:36:13,440 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2021-11-13 18:36:13,452 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2021-11-13 18:36:13,457 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 23 states have (on average 1.0869565217391304) internal successors, (25), 24 states have internal predecessors, (25), 5 states have call successors, (5), 2 states have call predecessors, (5), 5 states have return successors, (15), 7 states have call predecessors, (15), 5 states have call successors, (15) [2021-11-13 18:36:13,467 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 45 transitions. [2021-11-13 18:36:13,469 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 45 transitions. Word has length 26 [2021-11-13 18:36:13,469 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 18:36:13,469 INFO L470 AbstractCegarLoop]: Abstraction has 34 states and 45 transitions. [2021-11-13 18:36:13,469 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 3.857142857142857) internal successors, (27), 7 states have internal predecessors, (27), 3 states have call successors, (4), 1 states have call predecessors, (4), 4 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) [2021-11-13 18:36:13,470 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 45 transitions. [2021-11-13 18:36:13,471 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-11-13 18:36:13,472 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 18:36:13,472 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 18:36:13,513 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f7905ba-f70f-4e28-a2dd-cff410e98a20/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-13 18:36:13,698 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f7905ba-f70f-4e28-a2dd-cff410e98a20/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 18:36:13,699 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 18:36:13,699 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 18:36:13,699 INFO L85 PathProgramCache]: Analyzing trace with hash 1429337198, now seen corresponding path program 1 times [2021-11-13 18:36:13,700 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 18:36:13,700 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [818821961] [2021-11-13 18:36:13,700 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 18:36:13,700 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 18:36:13,752 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-11-13 18:36:13,752 INFO L355 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-11-13 18:36:13,793 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-11-13 18:36:13,846 INFO L133 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-11-13 18:36:13,847 INFO L628 BasicCegarLoop]: Counterexample is feasible [2021-11-13 18:36:13,848 INFO L764 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION (0 of 1 remaining) [2021-11-13 18:36:13,850 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-11-13 18:36:13,857 INFO L732 BasicCegarLoop]: Path program histogram: [2, 1, 1] [2021-11-13 18:36:13,866 INFO L179 ceAbstractionStarter]: Computing trace abstraction results [2021-11-13 18:36:13,890 FATAL L? ?]: The Plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction has thrown an exception: java.lang.NullPointerException at de.uni_freiburg.informatik.ultimate.boogie.procedureinliner.backtranslation.InlinerBacktranslator.computeCurrectProc(InlinerBacktranslator.java:230) at de.uni_freiburg.informatik.ultimate.boogie.procedureinliner.backtranslation.InlinerBacktranslator.translateProgramExecution(InlinerBacktranslator.java:203) at de.uni_freiburg.informatik.ultimate.core.coreplugin.services.ModelTranslationContainer.translateProgramExecution(ModelTranslationContainer.java:216) at de.uni_freiburg.informatik.ultimate.core.coreplugin.services.ModelTranslationContainer.translateProgramExecution(ModelTranslationContainer.java:225) at de.uni_freiburg.informatik.ultimate.core.coreplugin.services.ModelTranslationContainer.translateProgramExecution(ModelTranslationContainer.java:225) at de.uni_freiburg.informatik.ultimate.core.coreplugin.services.ModelTranslationContainer.translateProgramExecution(ModelTranslationContainer.java:206) at de.uni_freiburg.informatik.ultimate.core.lib.results.CounterExampleResult.getProgramExecutionAsString(CounterExampleResult.java:155) at de.uni_freiburg.informatik.ultimate.core.lib.results.CounterExampleResult.getLongDescription(CounterExampleResult.java:134) at de.uni_freiburg.informatik.ultimate.core.coreplugin.services.ResultService.reportResult(ResultService.java:86) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopResultReporter.reportResult(CegarLoopResultReporter.java:141) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.reportLocationResults(TraceAbstractionStarter.java:586) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:181) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-13 18:36:13,893 INFO L158 Benchmark]: Toolchain (without parser) took 3727.01ms. Allocated memory was 90.2MB in the beginning and 109.1MB in the end (delta: 18.9MB). Free memory was 49.6MB in the beginning and 66.4MB in the end (delta: -16.8MB). Peak memory consumption was 922.5kB. Max. memory is 16.1GB. [2021-11-13 18:36:13,894 INFO L158 Benchmark]: CDTParser took 0.24ms. Allocated memory is still 90.2MB. Free memory was 65.6MB in the beginning and 65.5MB in the end (delta: 47.3kB). There was no memory consumed. Max. memory is 16.1GB. [2021-11-13 18:36:13,895 INFO L158 Benchmark]: CACSL2BoogieTranslator took 257.76ms. Allocated memory is still 90.2MB. Free memory was 49.4MB in the beginning and 66.2MB in the end (delta: -16.8MB). Peak memory consumption was 5.9MB. Max. memory is 16.1GB. [2021-11-13 18:36:13,895 INFO L158 Benchmark]: Boogie Procedure Inliner took 34.31ms. Allocated memory is still 90.2MB. Free memory was 66.2MB in the beginning and 64.7MB in the end (delta: 1.5MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. [2021-11-13 18:36:13,896 INFO L158 Benchmark]: Boogie Preprocessor took 20.32ms. Allocated memory is still 90.2MB. Free memory was 64.7MB in the beginning and 63.7MB in the end (delta: 963.0kB). There was no memory consumed. Max. memory is 16.1GB. [2021-11-13 18:36:13,897 INFO L158 Benchmark]: RCFGBuilder took 294.53ms. Allocated memory is still 90.2MB. Free memory was 63.7MB in the beginning and 53.9MB in the end (delta: 9.8MB). Peak memory consumption was 10.5MB. Max. memory is 16.1GB. [2021-11-13 18:36:13,897 INFO L158 Benchmark]: TraceAbstraction took 3113.81ms. Allocated memory was 90.2MB in the beginning and 109.1MB in the end (delta: 18.9MB). Free memory was 53.4MB in the beginning and 66.4MB in the end (delta: -13.0MB). Peak memory consumption was 7.4MB. Max. memory is 16.1GB. [2021-11-13 18:36:13,906 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.24ms. Allocated memory is still 90.2MB. Free memory was 65.6MB in the beginning and 65.5MB in the end (delta: 47.3kB). There was no memory consumed. Max. memory is 16.1GB. * CACSL2BoogieTranslator took 257.76ms. Allocated memory is still 90.2MB. Free memory was 49.4MB in the beginning and 66.2MB in the end (delta: -16.8MB). Peak memory consumption was 5.9MB. Max. memory is 16.1GB. * Boogie Procedure Inliner took 34.31ms. Allocated memory is still 90.2MB. Free memory was 66.2MB in the beginning and 64.7MB in the end (delta: 1.5MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. * Boogie Preprocessor took 20.32ms. Allocated memory is still 90.2MB. Free memory was 64.7MB in the beginning and 63.7MB in the end (delta: 963.0kB). There was no memory consumed. Max. memory is 16.1GB. * RCFGBuilder took 294.53ms. Allocated memory is still 90.2MB. Free memory was 63.7MB in the beginning and 53.9MB in the end (delta: 9.8MB). Peak memory consumption was 10.5MB. Max. memory is 16.1GB. * TraceAbstraction took 3113.81ms. Allocated memory was 90.2MB in the beginning and 109.1MB in the end (delta: 18.9MB). Free memory was 53.4MB in the beginning and 66.4MB in the end (delta: -13.0MB). Peak memory consumption was 7.4MB. Max. memory is 16.1GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - StatisticsResult: ErrorAutomatonStatistics NumberErrorTraces: 0, NumberStatementsAllTraces: 0, NumberRelevantStatements: 0, 0.0s ErrorAutomatonConstructionTimeTotal, 0.0s FaulLocalizationTime, NumberStatementsFirstTrace: -1, TraceLengthAvg: 0, 0.0s ErrorAutomatonConstructionTimeAvg, 0.0s ErrorAutomatonDifferenceTimeAvg, 0.0s ErrorAutomatonDifferenceTimeTotal, NumberOfNoEnhancement: 0, NumberOfFiniteEnhancement: 0, NumberOfInfiniteEnhancement: 0 - ExceptionOrErrorResult: NullPointerException: null de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: NullPointerException: null: de.uni_freiburg.informatik.ultimate.boogie.procedureinliner.backtranslation.InlinerBacktranslator.computeCurrectProc(InlinerBacktranslator.java:230) RESULT: Ultimate could not prove your program: Toolchain returned no result. [2021-11-13 18:36:13,946 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f7905ba-f70f-4e28-a2dd-cff410e98a20/bin/uautomizer-YU5uOKAj3y/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Forceful destruction successful, exit code 0 Received shutdown request... --- End real Ultimate output --- Execution finished normally Using bit-precise analysis Retrying with bit-precise analysis ### Bit-precise run ### Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f7905ba-f70f-4e28-a2dd-cff410e98a20/bin/uautomizer-YU5uOKAj3y/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f7905ba-f70f-4e28-a2dd-cff410e98a20/bin/uautomizer-YU5uOKAj3y/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f7905ba-f70f-4e28-a2dd-cff410e98a20/bin/uautomizer-YU5uOKAj3y/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f7905ba-f70f-4e28-a2dd-cff410e98a20/bin/uautomizer-YU5uOKAj3y/config/AutomizerReach.xml -i ../../sv-benchmarks/c/recursive/Ackermann02.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f7905ba-f70f-4e28-a2dd-cff410e98a20/bin/uautomizer-YU5uOKAj3y/config/svcomp-Reach-32bit-Automizer_Bitvector.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f7905ba-f70f-4e28-a2dd-cff410e98a20/bin/uautomizer-YU5uOKAj3y --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 20c02b81d1b1bc312ccc75d6e9b31c6252d69e8a6e2560afe3a2a95a3e53102a --- Real Ultimate output --- This is Ultimate 0.2.1-dev-63182f1 [2021-11-13 18:36:16,526 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-13 18:36:16,530 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-13 18:36:16,590 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-13 18:36:16,591 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-13 18:36:16,596 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-13 18:36:16,598 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-13 18:36:16,606 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-13 18:36:16,609 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-13 18:36:16,617 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-13 18:36:16,618 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-13 18:36:16,620 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-13 18:36:16,620 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-13 18:36:16,623 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-13 18:36:16,625 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-13 18:36:16,631 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-13 18:36:16,632 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-13 18:36:16,634 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-13 18:36:16,636 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-13 18:36:16,643 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-13 18:36:16,645 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-13 18:36:16,647 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-13 18:36:16,650 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-13 18:36:16,652 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-13 18:36:16,658 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-13 18:36:16,658 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-13 18:36:16,659 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-13 18:36:16,661 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-13 18:36:16,661 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-13 18:36:16,663 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-13 18:36:16,663 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-13 18:36:16,664 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-13 18:36:16,666 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-13 18:36:16,667 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-13 18:36:16,668 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-13 18:36:16,669 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-13 18:36:16,669 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-13 18:36:16,670 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-13 18:36:16,670 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-13 18:36:16,672 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-13 18:36:16,673 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-13 18:36:16,673 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f7905ba-f70f-4e28-a2dd-cff410e98a20/bin/uautomizer-YU5uOKAj3y/config/svcomp-Reach-32bit-Automizer_Bitvector.epf [2021-11-13 18:36:16,722 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-13 18:36:16,723 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-13 18:36:16,723 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-13 18:36:16,723 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-13 18:36:16,724 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-13 18:36:16,724 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-13 18:36:16,726 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-11-13 18:36:16,726 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-11-13 18:36:16,726 INFO L138 SettingsManager]: * Use SBE=true [2021-11-13 18:36:16,727 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-13 18:36:16,728 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-13 18:36:16,728 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-13 18:36:16,728 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-13 18:36:16,728 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-13 18:36:16,729 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-13 18:36:16,729 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-13 18:36:16,729 INFO L138 SettingsManager]: * Use bitvectors instead of ints=true [2021-11-13 18:36:16,729 INFO L138 SettingsManager]: * Memory model=HoenickeLindenmann_4ByteResolution [2021-11-13 18:36:16,729 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-13 18:36:16,729 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-13 18:36:16,730 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-13 18:36:16,730 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-13 18:36:16,730 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-13 18:36:16,730 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-11-13 18:36:16,730 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-13 18:36:16,731 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-13 18:36:16,731 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-13 18:36:16,731 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-13 18:36:16,731 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-13 18:36:16,731 INFO L138 SettingsManager]: * Trace refinement strategy=WOLF [2021-11-13 18:36:16,732 INFO L138 SettingsManager]: * Command for external solver=cvc4 --incremental --print-success --lang smt [2021-11-13 18:36:16,732 INFO L138 SettingsManager]: * Large block encoding in concurrent analysis=OFF [2021-11-13 18:36:16,732 INFO L138 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2021-11-13 18:36:16,732 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-13 18:36:16,733 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-13 18:36:16,733 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-13 18:36:16,733 INFO L138 SettingsManager]: * Logic for external solver=AUFBV WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f7905ba-f70f-4e28-a2dd-cff410e98a20/bin/uautomizer-YU5uOKAj3y/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f7905ba-f70f-4e28-a2dd-cff410e98a20/bin/uautomizer-YU5uOKAj3y Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 20c02b81d1b1bc312ccc75d6e9b31c6252d69e8a6e2560afe3a2a95a3e53102a [2021-11-13 18:36:17,099 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-13 18:36:17,133 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-13 18:36:17,136 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-13 18:36:17,138 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-13 18:36:17,138 INFO L275 PluginConnector]: CDTParser initialized [2021-11-13 18:36:17,140 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f7905ba-f70f-4e28-a2dd-cff410e98a20/bin/uautomizer-YU5uOKAj3y/../../sv-benchmarks/c/recursive/Ackermann02.c [2021-11-13 18:36:17,218 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f7905ba-f70f-4e28-a2dd-cff410e98a20/bin/uautomizer-YU5uOKAj3y/data/acd8a0124/3784a21ff2e140a0a83c6f47b30b2f00/FLAGe07f630dd [2021-11-13 18:36:17,751 INFO L306 CDTParser]: Found 1 translation units. [2021-11-13 18:36:17,752 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f7905ba-f70f-4e28-a2dd-cff410e98a20/sv-benchmarks/c/recursive/Ackermann02.c [2021-11-13 18:36:17,760 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f7905ba-f70f-4e28-a2dd-cff410e98a20/bin/uautomizer-YU5uOKAj3y/data/acd8a0124/3784a21ff2e140a0a83c6f47b30b2f00/FLAGe07f630dd [2021-11-13 18:36:18,130 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f7905ba-f70f-4e28-a2dd-cff410e98a20/bin/uautomizer-YU5uOKAj3y/data/acd8a0124/3784a21ff2e140a0a83c6f47b30b2f00 [2021-11-13 18:36:18,134 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-13 18:36:18,136 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-13 18:36:18,139 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-13 18:36:18,139 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-13 18:36:18,143 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-13 18:36:18,144 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 13.11 06:36:18" (1/1) ... [2021-11-13 18:36:18,146 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7b4ddad8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 06:36:18, skipping insertion in model container [2021-11-13 18:36:18,147 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 13.11 06:36:18" (1/1) ... [2021-11-13 18:36:18,158 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-13 18:36:18,174 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-13 18:36:18,394 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_2f7905ba-f70f-4e28-a2dd-cff410e98a20/sv-benchmarks/c/recursive/Ackermann02.c[1157,1170] [2021-11-13 18:36:18,399 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-13 18:36:18,412 INFO L203 MainTranslator]: Completed pre-run [2021-11-13 18:36:18,438 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_2f7905ba-f70f-4e28-a2dd-cff410e98a20/sv-benchmarks/c/recursive/Ackermann02.c[1157,1170] [2021-11-13 18:36:18,439 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-13 18:36:18,455 INFO L208 MainTranslator]: Completed translation [2021-11-13 18:36:18,455 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 06:36:18 WrapperNode [2021-11-13 18:36:18,455 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-13 18:36:18,474 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-13 18:36:18,475 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-13 18:36:18,475 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-13 18:36:18,486 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 06:36:18" (1/1) ... [2021-11-13 18:36:18,503 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 06:36:18" (1/1) ... [2021-11-13 18:36:18,534 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-13 18:36:18,535 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-13 18:36:18,535 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-13 18:36:18,536 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-13 18:36:18,545 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 06:36:18" (1/1) ... [2021-11-13 18:36:18,546 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 06:36:18" (1/1) ... [2021-11-13 18:36:18,560 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 06:36:18" (1/1) ... [2021-11-13 18:36:18,561 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 06:36:18" (1/1) ... [2021-11-13 18:36:18,568 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 06:36:18" (1/1) ... [2021-11-13 18:36:18,574 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 06:36:18" (1/1) ... [2021-11-13 18:36:18,582 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 06:36:18" (1/1) ... [2021-11-13 18:36:18,589 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-13 18:36:18,592 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-13 18:36:18,594 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-13 18:36:18,594 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-13 18:36:18,595 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 06:36:18" (1/1) ... [2021-11-13 18:36:18,605 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-13 18:36:18,618 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f7905ba-f70f-4e28-a2dd-cff410e98a20/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 18:36:18,631 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f7905ba-f70f-4e28-a2dd-cff410e98a20/bin/uautomizer-YU5uOKAj3y/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-13 18:36:18,647 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f7905ba-f70f-4e28-a2dd-cff410e98a20/bin/uautomizer-YU5uOKAj3y/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-13 18:36:18,688 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-13 18:36:18,689 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-13 18:36:18,689 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE1 [2021-11-13 18:36:18,689 INFO L130 BoogieDeclarations]: Found specification of procedure ackermann [2021-11-13 18:36:18,690 INFO L138 BoogieDeclarations]: Found implementation of procedure ackermann [2021-11-13 18:36:18,690 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-13 18:36:19,016 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-13 18:36:19,034 INFO L299 CfgBuilder]: Removed 0 assume(true) statements. [2021-11-13 18:36:19,037 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 13.11 06:36:19 BoogieIcfgContainer [2021-11-13 18:36:19,037 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-13 18:36:19,039 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-13 18:36:19,039 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-13 18:36:19,042 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-13 18:36:19,043 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 13.11 06:36:18" (1/3) ... [2021-11-13 18:36:19,044 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@330d20a0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 13.11 06:36:19, skipping insertion in model container [2021-11-13 18:36:19,044 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 06:36:18" (2/3) ... [2021-11-13 18:36:19,045 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@330d20a0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 13.11 06:36:19, skipping insertion in model container [2021-11-13 18:36:19,045 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 13.11 06:36:19" (3/3) ... [2021-11-13 18:36:19,047 INFO L111 eAbstractionObserver]: Analyzing ICFG Ackermann02.c [2021-11-13 18:36:19,068 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-13 18:36:19,069 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-13 18:36:19,164 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-13 18:36:19,172 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=PETRI_NET, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-13 18:36:19,173 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-13 18:36:19,190 INFO L276 IsEmpty]: Start isEmpty. Operand has 22 states, 15 states have (on average 1.4) internal successors, (21), 16 states have internal predecessors, (21), 4 states have call successors, (4), 1 states have call predecessors, (4), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-11-13 18:36:19,203 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-11-13 18:36:19,203 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 18:36:19,204 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 18:36:19,204 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 18:36:19,210 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 18:36:19,215 INFO L85 PathProgramCache]: Analyzing trace with hash -273059606, now seen corresponding path program 1 times [2021-11-13 18:36:19,226 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-11-13 18:36:19,229 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [328040917] [2021-11-13 18:36:19,230 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 18:36:19,231 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-13 18:36:19,231 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f7905ba-f70f-4e28-a2dd-cff410e98a20/bin/uautomizer-YU5uOKAj3y/mathsat [2021-11-13 18:36:19,235 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f7905ba-f70f-4e28-a2dd-cff410e98a20/bin/uautomizer-YU5uOKAj3y/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-13 18:36:19,271 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f7905ba-f70f-4e28-a2dd-cff410e98a20/bin/uautomizer-YU5uOKAj3y/mathsat -unsat_core_generation=3 (2)] Waiting until timeout for monitored process [2021-11-13 18:36:19,345 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:36:19,348 INFO L263 TraceCheckSpWp]: Trace formula consists of 41 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-13 18:36:19,354 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 18:36:19,523 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 18:36:19,523 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 18:36:19,657 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 18:36:19,658 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-11-13 18:36:19,658 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [328040917] [2021-11-13 18:36:19,659 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [328040917] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-13 18:36:19,659 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-13 18:36:19,660 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6, 5] imperfect sequences [] total 9 [2021-11-13 18:36:19,661 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1986782717] [2021-11-13 18:36:19,662 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-13 18:36:19,667 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-13 18:36:19,667 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-11-13 18:36:19,695 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-13 18:36:19,696 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2021-11-13 18:36:19,699 INFO L87 Difference]: Start difference. First operand has 22 states, 15 states have (on average 1.4) internal successors, (21), 16 states have internal predecessors, (21), 4 states have call successors, (4), 1 states have call predecessors, (4), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Second operand has 9 states, 9 states have (on average 1.8888888888888888) internal successors, (17), 9 states have internal predecessors, (17), 2 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-13 18:36:19,997 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 18:36:19,998 INFO L93 Difference]: Finished difference Result 66 states and 102 transitions. [2021-11-13 18:36:19,999 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-13 18:36:20,000 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 1.8888888888888888) internal successors, (17), 9 states have internal predecessors, (17), 2 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 12 [2021-11-13 18:36:20,001 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 18:36:20,010 INFO L225 Difference]: With dead ends: 66 [2021-11-13 18:36:20,011 INFO L226 Difference]: Without dead ends: 33 [2021-11-13 18:36:20,014 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=38, Invalid=94, Unknown=0, NotChecked=0, Total=132 [2021-11-13 18:36:20,018 INFO L933 BasicCegarLoop]: 29 mSDtfsCounter, 34 mSDsluCounter, 105 mSDsCounter, 0 mSdLazyCounter, 120 mSolverCounterSat, 28 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 165.13ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 46 SdHoareTripleChecker+Valid, 134 SdHoareTripleChecker+Invalid, 148 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 7.17ms SdHoareTripleChecker+Time, 28 IncrementalHoareTripleChecker+Valid, 120 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 199.84ms IncrementalHoareTripleChecker+Time [2021-11-13 18:36:20,020 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [46 Valid, 134 Invalid, 148 Unknown, 0 Unchecked, 7.17ms Time], IncrementalHoareTripleChecker [28 Valid, 120 Invalid, 0 Unknown, 0 Unchecked, 199.84ms Time] [2021-11-13 18:36:20,037 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2021-11-13 18:36:20,061 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2021-11-13 18:36:20,062 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 21 states have (on average 1.1904761904761905) internal successors, (25), 21 states have internal predecessors, (25), 8 states have call successors, (8), 2 states have call predecessors, (8), 3 states have return successors, (18), 9 states have call predecessors, (18), 8 states have call successors, (18) [2021-11-13 18:36:20,065 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 51 transitions. [2021-11-13 18:36:20,066 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 51 transitions. Word has length 12 [2021-11-13 18:36:20,067 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 18:36:20,067 INFO L470 AbstractCegarLoop]: Abstraction has 33 states and 51 transitions. [2021-11-13 18:36:20,067 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 1.8888888888888888) internal successors, (17), 9 states have internal predecessors, (17), 2 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-13 18:36:20,068 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 51 transitions. [2021-11-13 18:36:20,071 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-11-13 18:36:20,071 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 18:36:20,071 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 18:36:20,087 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f7905ba-f70f-4e28-a2dd-cff410e98a20/bin/uautomizer-YU5uOKAj3y/mathsat -unsat_core_generation=3 (2)] Forceful destruction successful, exit code 0 [2021-11-13 18:36:20,283 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f7905ba-f70f-4e28-a2dd-cff410e98a20/bin/uautomizer-YU5uOKAj3y/mathsat -unsat_core_generation=3 [2021-11-13 18:36:20,283 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 18:36:20,284 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 18:36:20,284 INFO L85 PathProgramCache]: Analyzing trace with hash 1950032110, now seen corresponding path program 1 times [2021-11-13 18:36:20,285 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-11-13 18:36:20,285 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [313063938] [2021-11-13 18:36:20,285 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 18:36:20,286 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-13 18:36:20,286 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f7905ba-f70f-4e28-a2dd-cff410e98a20/bin/uautomizer-YU5uOKAj3y/mathsat [2021-11-13 18:36:20,287 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f7905ba-f70f-4e28-a2dd-cff410e98a20/bin/uautomizer-YU5uOKAj3y/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-13 18:36:20,290 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f7905ba-f70f-4e28-a2dd-cff410e98a20/bin/uautomizer-YU5uOKAj3y/mathsat -unsat_core_generation=3 (3)] Waiting until timeout for monitored process [2021-11-13 18:36:20,329 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 18:36:20,331 INFO L263 TraceCheckSpWp]: Trace formula consists of 63 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-13 18:36:20,333 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 18:36:20,441 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 10 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-13 18:36:20,441 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 18:36:20,628 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 10 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-13 18:36:20,629 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-11-13 18:36:20,629 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [313063938] [2021-11-13 18:36:20,629 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [313063938] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 18:36:20,629 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-13 18:36:20,630 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 6 [2021-11-13 18:36:20,630 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1126686261] [2021-11-13 18:36:20,630 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-13 18:36:20,632 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-13 18:36:20,632 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-11-13 18:36:20,633 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-13 18:36:20,633 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-13 18:36:20,634 INFO L87 Difference]: Start difference. First operand 33 states and 51 transitions. Second operand has 6 states, 6 states have (on average 4.0) internal successors, (24), 6 states have internal predecessors, (24), 3 states have call successors, (4), 1 states have call predecessors, (4), 4 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) [2021-11-13 18:36:20,703 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 18:36:20,703 INFO L93 Difference]: Finished difference Result 65 states and 129 transitions. [2021-11-13 18:36:20,704 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-13 18:36:20,704 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 4.0) internal successors, (24), 6 states have internal predecessors, (24), 3 states have call successors, (4), 1 states have call predecessors, (4), 4 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) Word has length 26 [2021-11-13 18:36:20,705 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 18:36:20,708 INFO L225 Difference]: With dead ends: 65 [2021-11-13 18:36:20,708 INFO L226 Difference]: Without dead ends: 37 [2021-11-13 18:36:20,710 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 47 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=23, Unknown=0, NotChecked=0, Total=42 [2021-11-13 18:36:20,712 INFO L933 BasicCegarLoop]: 17 mSDtfsCounter, 12 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 21 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 42.04ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 27 SdHoareTripleChecker+Invalid, 25 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 1.08ms SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 21 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 48.20ms IncrementalHoareTripleChecker+Time [2021-11-13 18:36:20,713 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 27 Invalid, 25 Unknown, 0 Unchecked, 1.08ms Time], IncrementalHoareTripleChecker [4 Valid, 21 Invalid, 0 Unknown, 0 Unchecked, 48.20ms Time] [2021-11-13 18:36:20,714 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2021-11-13 18:36:20,725 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2021-11-13 18:36:20,725 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 23 states have (on average 1.173913043478261) internal successors, (27), 25 states have internal predecessors, (27), 8 states have call successors, (8), 2 states have call predecessors, (8), 5 states have return successors, (27), 9 states have call predecessors, (27), 8 states have call successors, (27) [2021-11-13 18:36:20,731 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 62 transitions. [2021-11-13 18:36:20,732 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 62 transitions. Word has length 26 [2021-11-13 18:36:20,732 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 18:36:20,732 INFO L470 AbstractCegarLoop]: Abstraction has 37 states and 62 transitions. [2021-11-13 18:36:20,733 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 4.0) internal successors, (24), 6 states have internal predecessors, (24), 3 states have call successors, (4), 1 states have call predecessors, (4), 4 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) [2021-11-13 18:36:20,733 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 62 transitions. [2021-11-13 18:36:20,735 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2021-11-13 18:36:20,741 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 18:36:20,741 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 18:36:20,770 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f7905ba-f70f-4e28-a2dd-cff410e98a20/bin/uautomizer-YU5uOKAj3y/mathsat -unsat_core_generation=3 (3)] Forceful destruction successful, exit code 0 [2021-11-13 18:36:20,954 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f7905ba-f70f-4e28-a2dd-cff410e98a20/bin/uautomizer-YU5uOKAj3y/mathsat -unsat_core_generation=3 [2021-11-13 18:36:20,954 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 18:36:20,955 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 18:36:20,955 INFO L85 PathProgramCache]: Analyzing trace with hash -690146316, now seen corresponding path program 1 times [2021-11-13 18:36:20,955 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-11-13 18:36:20,956 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [508466526] [2021-11-13 18:36:20,956 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 18:36:20,956 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-13 18:36:20,957 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f7905ba-f70f-4e28-a2dd-cff410e98a20/bin/uautomizer-YU5uOKAj3y/mathsat [2021-11-13 18:36:20,958 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f7905ba-f70f-4e28-a2dd-cff410e98a20/bin/uautomizer-YU5uOKAj3y/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-13 18:36:20,998 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f7905ba-f70f-4e28-a2dd-cff410e98a20/bin/uautomizer-YU5uOKAj3y/mathsat -unsat_core_generation=3 (4)] Waiting until timeout for monitored process [2021-11-13 18:36:21,039 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-11-13 18:36:21,039 INFO L355 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-11-13 18:36:21,076 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-11-13 18:36:21,116 INFO L133 FreeRefinementEngine]: Strategy WOLF found a feasible trace [2021-11-13 18:36:21,116 INFO L628 BasicCegarLoop]: Counterexample is feasible [2021-11-13 18:36:21,117 INFO L764 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION (0 of 1 remaining) [2021-11-13 18:36:21,134 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f7905ba-f70f-4e28-a2dd-cff410e98a20/bin/uautomizer-YU5uOKAj3y/mathsat -unsat_core_generation=3 (4)] Forceful destruction successful, exit code 0 [2021-11-13 18:36:21,330 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f7905ba-f70f-4e28-a2dd-cff410e98a20/bin/uautomizer-YU5uOKAj3y/mathsat -unsat_core_generation=3 [2021-11-13 18:36:21,333 INFO L732 BasicCegarLoop]: Path program histogram: [1, 1, 1] [2021-11-13 18:36:21,337 INFO L179 ceAbstractionStarter]: Computing trace abstraction results [2021-11-13 18:36:21,356 FATAL L? ?]: The Plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction has thrown an exception: java.lang.NullPointerException at de.uni_freiburg.informatik.ultimate.boogie.procedureinliner.backtranslation.InlinerBacktranslator.computeCurrectProc(InlinerBacktranslator.java:230) at de.uni_freiburg.informatik.ultimate.boogie.procedureinliner.backtranslation.InlinerBacktranslator.translateProgramExecution(InlinerBacktranslator.java:203) at de.uni_freiburg.informatik.ultimate.core.coreplugin.services.ModelTranslationContainer.translateProgramExecution(ModelTranslationContainer.java:216) at de.uni_freiburg.informatik.ultimate.core.coreplugin.services.ModelTranslationContainer.translateProgramExecution(ModelTranslationContainer.java:225) at de.uni_freiburg.informatik.ultimate.core.coreplugin.services.ModelTranslationContainer.translateProgramExecution(ModelTranslationContainer.java:225) at de.uni_freiburg.informatik.ultimate.core.coreplugin.services.ModelTranslationContainer.translateProgramExecution(ModelTranslationContainer.java:206) at de.uni_freiburg.informatik.ultimate.core.lib.results.CounterExampleResult.getProgramExecutionAsString(CounterExampleResult.java:155) at de.uni_freiburg.informatik.ultimate.core.lib.results.CounterExampleResult.getLongDescription(CounterExampleResult.java:134) at de.uni_freiburg.informatik.ultimate.core.coreplugin.services.ResultService.reportResult(ResultService.java:86) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopResultReporter.reportResult(CegarLoopResultReporter.java:141) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.reportLocationResults(TraceAbstractionStarter.java:586) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:181) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-13 18:36:21,358 INFO L158 Benchmark]: Toolchain (without parser) took 3221.60ms. Allocated memory was 67.1MB in the beginning and 83.9MB in the end (delta: 16.8MB). Free memory was 44.7MB in the beginning and 51.4MB in the end (delta: -6.7MB). Peak memory consumption was 9.8MB. Max. memory is 16.1GB. [2021-11-13 18:36:21,359 INFO L158 Benchmark]: CDTParser took 0.26ms. Allocated memory is still 52.4MB. Free memory was 32.1MB in the beginning and 32.0MB in the end (delta: 41.7kB). There was no memory consumed. Max. memory is 16.1GB. [2021-11-13 18:36:21,360 INFO L158 Benchmark]: CACSL2BoogieTranslator took 317.11ms. Allocated memory is still 67.1MB. Free memory was 44.4MB in the beginning and 34.5MB in the end (delta: 9.9MB). Peak memory consumption was 10.5MB. Max. memory is 16.1GB. [2021-11-13 18:36:21,360 INFO L158 Benchmark]: Boogie Procedure Inliner took 59.93ms. Allocated memory is still 67.1MB. Free memory was 51.3MB in the beginning and 49.8MB in the end (delta: 1.4MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. [2021-11-13 18:36:21,361 INFO L158 Benchmark]: Boogie Preprocessor took 56.44ms. Allocated memory is still 67.1MB. Free memory was 49.8MB in the beginning and 48.7MB in the end (delta: 1.1MB). There was no memory consumed. Max. memory is 16.1GB. [2021-11-13 18:36:21,371 INFO L158 Benchmark]: RCFGBuilder took 444.79ms. Allocated memory is still 67.1MB. Free memory was 48.7MB in the beginning and 39.0MB in the end (delta: 9.7MB). Peak memory consumption was 8.4MB. Max. memory is 16.1GB. [2021-11-13 18:36:21,371 INFO L158 Benchmark]: TraceAbstraction took 2318.61ms. Allocated memory was 67.1MB in the beginning and 83.9MB in the end (delta: 16.8MB). Free memory was 38.5MB in the beginning and 51.4MB in the end (delta: -13.0MB). Peak memory consumption was 4.7MB. Max. memory is 16.1GB. [2021-11-13 18:36:21,375 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.26ms. Allocated memory is still 52.4MB. Free memory was 32.1MB in the beginning and 32.0MB in the end (delta: 41.7kB). There was no memory consumed. Max. memory is 16.1GB. * CACSL2BoogieTranslator took 317.11ms. Allocated memory is still 67.1MB. Free memory was 44.4MB in the beginning and 34.5MB in the end (delta: 9.9MB). Peak memory consumption was 10.5MB. Max. memory is 16.1GB. * Boogie Procedure Inliner took 59.93ms. Allocated memory is still 67.1MB. Free memory was 51.3MB in the beginning and 49.8MB in the end (delta: 1.4MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. * Boogie Preprocessor took 56.44ms. Allocated memory is still 67.1MB. Free memory was 49.8MB in the beginning and 48.7MB in the end (delta: 1.1MB). There was no memory consumed. Max. memory is 16.1GB. * RCFGBuilder took 444.79ms. Allocated memory is still 67.1MB. Free memory was 48.7MB in the beginning and 39.0MB in the end (delta: 9.7MB). Peak memory consumption was 8.4MB. Max. memory is 16.1GB. * TraceAbstraction took 2318.61ms. Allocated memory was 67.1MB in the beginning and 83.9MB in the end (delta: 16.8MB). Free memory was 38.5MB in the beginning and 51.4MB in the end (delta: -13.0MB). Peak memory consumption was 4.7MB. Max. memory is 16.1GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - StatisticsResult: ErrorAutomatonStatistics NumberErrorTraces: 0, NumberStatementsAllTraces: 0, NumberRelevantStatements: 0, 0.0s ErrorAutomatonConstructionTimeTotal, 0.0s FaulLocalizationTime, NumberStatementsFirstTrace: -1, TraceLengthAvg: 0, 0.0s ErrorAutomatonConstructionTimeAvg, 0.0s ErrorAutomatonDifferenceTimeAvg, 0.0s ErrorAutomatonDifferenceTimeTotal, NumberOfNoEnhancement: 0, NumberOfFiniteEnhancement: 0, NumberOfInfiniteEnhancement: 0 - ExceptionOrErrorResult: NullPointerException: null de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: NullPointerException: null: de.uni_freiburg.informatik.ultimate.boogie.procedureinliner.backtranslation.InlinerBacktranslator.computeCurrectProc(InlinerBacktranslator.java:230) RESULT: Ultimate could not prove your program: Toolchain returned no result. [2021-11-13 18:36:21,430 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2f7905ba-f70f-4e28-a2dd-cff410e98a20/bin/uautomizer-YU5uOKAj3y/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Forceful destruction successful, exit code 0 Received shutdown request... --- End real Ultimate output --- Execution finished normally Writing output log to file Ultimate.log Result: ERROR: ExceptionOrErrorResult: NullPointerException: null