./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 a4ecdabc Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud-vcloud-master/worker/run_dir_0b8e23bb-acea-4397-904d-15e93d5fcf17/bin/uautomizer/data/config -Xmx15G -Xms4m -jar /tmp/vcloud-vcloud-master/worker/run_dir_0b8e23bb-acea-4397-904d-15e93d5fcf17/bin/uautomizer/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/run_dir_0b8e23bb-acea-4397-904d-15e93d5fcf17/bin/uautomizer/data -tc /tmp/vcloud-vcloud-master/worker/run_dir_0b8e23bb-acea-4397-904d-15e93d5fcf17/bin/uautomizer/config/AutomizerReach.xml -i ../../sv-benchmarks/c/recursive/Ackermann02.c -s /tmp/vcloud-vcloud-master/worker/run_dir_0b8e23bb-acea-4397-904d-15e93d5fcf17/bin/uautomizer/config/svcomp-Reach-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/run_dir_0b8e23bb-acea-4397-904d-15e93d5fcf17/bin/uautomizer --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 035ba3eae82c1904e7a9c5ede20dafeb782b642c ................................................................................................................................................................................................................................................................................................................................................................................................................................ Execution finished normally Writing output log to file Ultimate.log Writing human readable error path to file UltimateCounterExample.errorpath Result: FALSE --- Real Ultimate output --- This is Ultimate 0.2.0-a4ecdab [2020-11-28 03:03:14,615 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-11-28 03:03:14,618 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-11-28 03:03:14,728 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-11-28 03:03:14,729 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-11-28 03:03:14,730 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-11-28 03:03:14,733 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-11-28 03:03:14,735 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-11-28 03:03:14,738 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-11-28 03:03:14,739 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-11-28 03:03:14,741 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-11-28 03:03:14,743 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-11-28 03:03:14,743 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-11-28 03:03:14,745 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-11-28 03:03:14,746 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-11-28 03:03:14,748 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-11-28 03:03:14,749 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-11-28 03:03:14,750 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-11-28 03:03:14,752 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-11-28 03:03:14,755 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-11-28 03:03:14,757 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-11-28 03:03:14,763 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-11-28 03:03:14,766 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-11-28 03:03:14,767 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-11-28 03:03:14,781 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-11-28 03:03:14,783 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-11-28 03:03:14,784 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-11-28 03:03:14,785 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-11-28 03:03:14,786 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-11-28 03:03:14,787 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-11-28 03:03:14,788 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-11-28 03:03:14,789 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-11-28 03:03:14,790 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-11-28 03:03:14,791 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-11-28 03:03:14,792 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-11-28 03:03:14,793 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-11-28 03:03:14,794 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-11-28 03:03:14,794 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-11-28 03:03:14,795 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-11-28 03:03:14,799 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-11-28 03:03:14,800 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-11-28 03:03:14,802 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud-vcloud-master/worker/run_dir_0b8e23bb-acea-4397-904d-15e93d5fcf17/bin/uautomizer/config/svcomp-Reach-32bit-Automizer_Default.epf [2020-11-28 03:03:14,843 INFO L113 SettingsManager]: Loading preferences was successful [2020-11-28 03:03:14,843 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-11-28 03:03:14,845 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-11-28 03:03:14,845 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-11-28 03:03:14,845 INFO L138 SettingsManager]: * Use SBE=true [2020-11-28 03:03:14,846 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-11-28 03:03:14,846 INFO L138 SettingsManager]: * sizeof long=4 [2020-11-28 03:03:14,846 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-11-28 03:03:14,846 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-11-28 03:03:14,846 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-11-28 03:03:14,847 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-11-28 03:03:14,848 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-11-28 03:03:14,848 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-11-28 03:03:14,848 INFO L138 SettingsManager]: * sizeof long double=12 [2020-11-28 03:03:14,848 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-11-28 03:03:14,849 INFO L138 SettingsManager]: * Use constant arrays=true [2020-11-28 03:03:14,849 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-11-28 03:03:14,849 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-11-28 03:03:14,849 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-11-28 03:03:14,849 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-11-28 03:03:14,850 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-11-28 03:03:14,850 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-11-28 03:03:14,850 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-11-28 03:03:14,850 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-11-28 03:03:14,851 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-11-28 03:03:14,851 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-11-28 03:03:14,851 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-11-28 03:03:14,851 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-11-28 03:03:14,851 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-11-28 03:03:14,852 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-vcloud-master/worker/run_dir_0b8e23bb-acea-4397-904d-15e93d5fcf17/bin/uautomizer/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud-vcloud-master/worker/run_dir_0b8e23bb-acea-4397-904d-15e93d5fcf17/bin/uautomizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 035ba3eae82c1904e7a9c5ede20dafeb782b642c [2020-11-28 03:03:15,181 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-11-28 03:03:15,222 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-11-28 03:03:15,226 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-11-28 03:03:15,228 INFO L271 PluginConnector]: Initializing CDTParser... [2020-11-28 03:03:15,229 INFO L275 PluginConnector]: CDTParser initialized [2020-11-28 03:03:15,230 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/run_dir_0b8e23bb-acea-4397-904d-15e93d5fcf17/bin/uautomizer/../../sv-benchmarks/c/recursive/Ackermann02.c [2020-11-28 03:03:15,320 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_0b8e23bb-acea-4397-904d-15e93d5fcf17/bin/uautomizer/data/cfcdbaa33/28916fef02e24d458c0a87b520ddbe73/FLAG9fc5e1af5 [2020-11-28 03:03:15,799 INFO L306 CDTParser]: Found 1 translation units. [2020-11-28 03:03:15,799 INFO L160 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/run_dir_0b8e23bb-acea-4397-904d-15e93d5fcf17/sv-benchmarks/c/recursive/Ackermann02.c [2020-11-28 03:03:15,810 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_0b8e23bb-acea-4397-904d-15e93d5fcf17/bin/uautomizer/data/cfcdbaa33/28916fef02e24d458c0a87b520ddbe73/FLAG9fc5e1af5 [2020-11-28 03:03:16,177 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/run_dir_0b8e23bb-acea-4397-904d-15e93d5fcf17/bin/uautomizer/data/cfcdbaa33/28916fef02e24d458c0a87b520ddbe73 [2020-11-28 03:03:16,180 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-11-28 03:03:16,182 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2020-11-28 03:03:16,183 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-11-28 03:03:16,184 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-11-28 03:03:16,187 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-11-28 03:03:16,188 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 28.11 03:03:16" (1/1) ... [2020-11-28 03:03:16,190 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1fbbd4dd and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 03:03:16, skipping insertion in model container [2020-11-28 03:03:16,191 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 28.11 03:03:16" (1/1) ... [2020-11-28 03:03:16,199 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-11-28 03:03:16,214 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-11-28 03:03:16,413 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-11-28 03:03:16,428 INFO L203 MainTranslator]: Completed pre-run [2020-11-28 03:03:16,443 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-11-28 03:03:16,458 INFO L208 MainTranslator]: Completed translation [2020-11-28 03:03:16,459 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 03:03:16 WrapperNode [2020-11-28 03:03:16,459 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-11-28 03:03:16,460 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2020-11-28 03:03:16,460 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2020-11-28 03:03:16,461 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2020-11-28 03:03:16,471 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 03:03:16" (1/1) ... [2020-11-28 03:03:16,478 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 03:03:16" (1/1) ... [2020-11-28 03:03:16,493 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2020-11-28 03:03:16,494 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-11-28 03:03:16,495 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-11-28 03:03:16,495 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-11-28 03:03:16,503 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 03:03:16" (1/1) ... [2020-11-28 03:03:16,503 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 03:03:16" (1/1) ... [2020-11-28 03:03:16,505 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 03:03:16" (1/1) ... [2020-11-28 03:03:16,505 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 03:03:16" (1/1) ... [2020-11-28 03:03:16,509 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 03:03:16" (1/1) ... [2020-11-28 03:03:16,511 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 03:03:16" (1/1) ... [2020-11-28 03:03:16,512 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 03:03:16" (1/1) ... [2020-11-28 03:03:16,514 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-11-28 03:03:16,515 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-11-28 03:03:16,516 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-11-28 03:03:16,516 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-11-28 03:03:16,523 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 03:03:16" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_0b8e23bb-acea-4397-904d-15e93d5fcf17/bin/uautomizer/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-11-28 03:03:16,596 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-11-28 03:03:16,596 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-11-28 03:03:16,597 INFO L130 BoogieDeclarations]: Found specification of procedure ackermann [2020-11-28 03:03:16,597 INFO L138 BoogieDeclarations]: Found implementation of procedure ackermann [2020-11-28 03:03:16,597 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-11-28 03:03:16,597 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-11-28 03:03:16,859 INFO L293 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-11-28 03:03:16,859 INFO L298 CfgBuilder]: Removed 6 assume(true) statements. [2020-11-28 03:03:16,860 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 28.11 03:03:16 BoogieIcfgContainer [2020-11-28 03:03:16,861 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-11-28 03:03:16,877 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-11-28 03:03:16,877 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-11-28 03:03:16,881 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-11-28 03:03:16,881 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 28.11 03:03:16" (1/3) ... [2020-11-28 03:03:16,882 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@d7bc381 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 28.11 03:03:16, skipping insertion in model container [2020-11-28 03:03:16,882 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 03:03:16" (2/3) ... [2020-11-28 03:03:16,882 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@d7bc381 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 28.11 03:03:16, skipping insertion in model container [2020-11-28 03:03:16,883 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 28.11 03:03:16" (3/3) ... [2020-11-28 03:03:16,884 INFO L111 eAbstractionObserver]: Analyzing ICFG Ackermann02.c [2020-11-28 03:03:16,895 INFO L164 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-11-28 03:03:16,911 INFO L176 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-11-28 03:03:16,927 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-11-28 03:03:16,959 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-11-28 03:03:16,960 INFO L378 AbstractCegarLoop]: Hoare is true [2020-11-28 03:03:16,960 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-11-28 03:03:16,960 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-11-28 03:03:16,960 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-11-28 03:03:16,960 INFO L382 AbstractCegarLoop]: Difference is false [2020-11-28 03:03:16,960 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-11-28 03:03:16,961 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-11-28 03:03:16,978 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states. [2020-11-28 03:03:16,984 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-11-28 03:03:16,984 INFO L414 BasicCegarLoop]: Found error trace [2020-11-28 03:03:16,985 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-28 03:03:16,985 INFO L429 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-28 03:03:16,991 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 03:03:16,992 INFO L82 PathProgramCache]: Analyzing trace with hash -1799437593, now seen corresponding path program 1 times [2020-11-28 03:03:17,001 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-28 03:03:17,002 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1311954352] [2020-11-28 03:03:17,002 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-28 03:03:17,116 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 03:03:17,194 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 4 [2020-11-28 03:03:17,201 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 03:03:17,281 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-28 03:03:17,282 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1311954352] [2020-11-28 03:03:17,283 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-28 03:03:17,283 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-11-28 03:03:17,284 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [530841524] [2020-11-28 03:03:17,288 INFO L461 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-11-28 03:03:17,289 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-28 03:03:17,309 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-11-28 03:03:17,310 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-11-28 03:03:17,312 INFO L87 Difference]: Start difference. First operand 24 states. Second operand 5 states. [2020-11-28 03:03:17,474 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-28 03:03:17,474 INFO L93 Difference]: Finished difference Result 52 states and 73 transitions. [2020-11-28 03:03:17,475 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-11-28 03:03:17,476 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 12 [2020-11-28 03:03:17,477 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-28 03:03:17,487 INFO L225 Difference]: With dead ends: 52 [2020-11-28 03:03:17,487 INFO L226 Difference]: Without dead ends: 25 [2020-11-28 03:03:17,491 INFO L677 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 [2020-11-28 03:03:17,510 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2020-11-28 03:03:17,541 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2020-11-28 03:03:17,542 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-11-28 03:03:17,544 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 32 transitions. [2020-11-28 03:03:17,547 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 32 transitions. Word has length 12 [2020-11-28 03:03:17,548 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-28 03:03:17,549 INFO L481 AbstractCegarLoop]: Abstraction has 25 states and 32 transitions. [2020-11-28 03:03:17,549 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-11-28 03:03:17,550 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 32 transitions. [2020-11-28 03:03:17,556 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-11-28 03:03:17,556 INFO L414 BasicCegarLoop]: Found error trace [2020-11-28 03:03:17,556 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-28 03:03:17,558 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-11-28 03:03:17,558 INFO L429 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-28 03:03:17,559 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 03:03:17,559 INFO L82 PathProgramCache]: Analyzing trace with hash 335222435, now seen corresponding path program 1 times [2020-11-28 03:03:17,560 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-28 03:03:17,560 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1756645186] [2020-11-28 03:03:17,560 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-28 03:03:17,613 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 03:03:17,647 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 4 [2020-11-28 03:03:17,655 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 03:03:17,697 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-11-28 03:03:17,701 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 03:03:17,727 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-11-28 03:03:17,731 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1756645186] [2020-11-28 03:03:17,731 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2015013554] [2020-11-28 03:03:17,732 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_0b8e23bb-acea-4397-904d-15e93d5fcf17/bin/uautomizer/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-28 03:03:17,832 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 03:03:17,834 INFO L263 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 6 conjunts are in the unsatisfiable core [2020-11-28 03:03:17,839 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-28 03:03:17,965 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-11-28 03:03:17,965 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-11-28 03:03:17,966 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 8 [2020-11-28 03:03:17,967 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1051168880] [2020-11-28 03:03:17,967 INFO L461 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-11-28 03:03:17,968 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-28 03:03:17,969 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-11-28 03:03:17,969 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2020-11-28 03:03:17,969 INFO L87 Difference]: Start difference. First operand 25 states and 32 transitions. Second operand 8 states. [2020-11-28 03:03:18,192 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-28 03:03:18,192 INFO L93 Difference]: Finished difference Result 57 states and 91 transitions. [2020-11-28 03:03:18,196 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-11-28 03:03:18,197 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 19 [2020-11-28 03:03:18,197 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-28 03:03:18,199 INFO L225 Difference]: With dead ends: 57 [2020-11-28 03:03:18,199 INFO L226 Difference]: Without dead ends: 30 [2020-11-28 03:03:18,201 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=38, Invalid=72, Unknown=0, NotChecked=0, Total=110 [2020-11-28 03:03:18,202 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-11-28 03:03:18,211 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2020-11-28 03:03:18,212 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-11-28 03:03:18,216 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 38 transitions. [2020-11-28 03:03:18,217 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 38 transitions. Word has length 19 [2020-11-28 03:03:18,217 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-28 03:03:18,217 INFO L481 AbstractCegarLoop]: Abstraction has 30 states and 38 transitions. [2020-11-28 03:03:18,217 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-11-28 03:03:18,218 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 38 transitions. [2020-11-28 03:03:18,222 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-11-28 03:03:18,222 INFO L414 BasicCegarLoop]: Found error trace [2020-11-28 03:03:18,224 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-28 03:03:18,440 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2020-11-28 03:03:18,440 INFO L429 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-28 03:03:18,441 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 03:03:18,441 INFO L82 PathProgramCache]: Analyzing trace with hash 561785385, now seen corresponding path program 2 times [2020-11-28 03:03:18,441 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-28 03:03:18,442 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [606900754] [2020-11-28 03:03:18,442 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-28 03:03:18,476 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 03:03:18,500 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 4 [2020-11-28 03:03:18,507 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 03:03:18,515 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-11-28 03:03:18,527 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 03:03:18,588 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-11-28 03:03:18,591 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 03:03:18,600 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 10 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-11-28 03:03:18,600 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [606900754] [2020-11-28 03:03:18,605 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1704305365] [2020-11-28 03:03:18,605 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_0b8e23bb-acea-4397-904d-15e93d5fcf17/bin/uautomizer/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-28 03:03:18,656 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-11-28 03:03:18,656 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-11-28 03:03:18,657 INFO L263 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 3 conjunts are in the unsatisfiable core [2020-11-28 03:03:18,659 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-28 03:03:18,690 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 10 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-11-28 03:03:18,691 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-11-28 03:03:18,691 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 6 [2020-11-28 03:03:18,691 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2104473254] [2020-11-28 03:03:18,692 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-11-28 03:03:18,692 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-28 03:03:18,693 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-11-28 03:03:18,693 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-11-28 03:03:18,693 INFO L87 Difference]: Start difference. First operand 30 states and 38 transitions. Second operand 6 states. [2020-11-28 03:03:18,754 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-28 03:03:18,755 INFO L93 Difference]: Finished difference Result 59 states and 86 transitions. [2020-11-28 03:03:18,755 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-11-28 03:03:18,755 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 26 [2020-11-28 03:03:18,756 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-28 03:03:18,757 INFO L225 Difference]: With dead ends: 59 [2020-11-28 03:03:18,757 INFO L226 Difference]: Without dead ends: 34 [2020-11-28 03:03:18,759 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 32 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2020-11-28 03:03:18,759 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-11-28 03:03:18,768 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2020-11-28 03:03:18,768 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-11-28 03:03:18,769 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 45 transitions. [2020-11-28 03:03:18,769 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 45 transitions. Word has length 26 [2020-11-28 03:03:18,769 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-28 03:03:18,770 INFO L481 AbstractCegarLoop]: Abstraction has 34 states and 45 transitions. [2020-11-28 03:03:18,770 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-11-28 03:03:18,770 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 45 transitions. [2020-11-28 03:03:18,771 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-11-28 03:03:18,771 INFO L414 BasicCegarLoop]: Found error trace [2020-11-28 03:03:18,772 INFO L422 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] [2020-11-28 03:03:18,996 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-28 03:03:18,996 INFO L429 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-28 03:03:18,997 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 03:03:18,997 INFO L82 PathProgramCache]: Analyzing trace with hash 1845686382, now seen corresponding path program 1 times [2020-11-28 03:03:18,997 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-28 03:03:18,998 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [470853386] [2020-11-28 03:03:18,998 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-28 03:03:19,059 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-28 03:03:19,059 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-28 03:03:19,086 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-28 03:03:19,086 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-28 03:03:19,127 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-11-28 03:03:19,128 INFO L523 BasicCegarLoop]: Counterexample might be feasible [2020-11-28 03:03:19,128 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-11-28 03:03:19,188 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 28.11 03:03:19 BoogieIcfgContainer [2020-11-28 03:03:19,189 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-11-28 03:03:19,189 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2020-11-28 03:03:19,189 INFO L271 PluginConnector]: Initializing Witness Printer... [2020-11-28 03:03:19,190 INFO L275 PluginConnector]: Witness Printer initialized [2020-11-28 03:03:19,190 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 28.11 03:03:16" (3/4) ... [2020-11-28 03:03:19,192 INFO L131 WitnessPrinter]: Generating witness for reachability counterexample [2020-11-28 03:03:19,249 INFO L141 WitnessManager]: Wrote witness to /tmp/vcloud-vcloud-master/worker/run_dir_0b8e23bb-acea-4397-904d-15e93d5fcf17/bin/uautomizer/witness.graphml [2020-11-28 03:03:19,249 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2020-11-28 03:03:19,251 INFO L168 Benchmark]: Toolchain (without parser) took 3068.13 ms. Allocated memory was 86.0 MB in the beginning and 104.9 MB in the end (delta: 18.9 MB). Free memory was 54.4 MB in the beginning and 80.0 MB in the end (delta: -25.6 MB). Peak memory consumption was 39.5 MB. Max. memory is 16.1 GB. [2020-11-28 03:03:19,251 INFO L168 Benchmark]: CDTParser took 0.25 ms. Allocated memory is still 86.0 MB. Free memory was 47.4 MB in the beginning and 47.4 MB in the end (delta: 34.4 kB). There was no memory consumed. Max. memory is 16.1 GB. [2020-11-28 03:03:19,252 INFO L168 Benchmark]: CACSL2BoogieTranslator took 275.91 ms. Allocated memory is still 86.0 MB. Free memory was 54.2 MB in the beginning and 63.9 MB in the end (delta: -9.7 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. [2020-11-28 03:03:19,253 INFO L168 Benchmark]: Boogie Procedure Inliner took 33.37 ms. Allocated memory is still 86.0 MB. Free memory was 63.9 MB in the beginning and 62.5 MB in the end (delta: 1.4 MB). There was no memory consumed. Max. memory is 16.1 GB. [2020-11-28 03:03:19,253 INFO L168 Benchmark]: Boogie Preprocessor took 20.26 ms. Allocated memory is still 86.0 MB. Free memory was 62.5 MB in the beginning and 61.4 MB in the end (delta: 1.0 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2020-11-28 03:03:19,254 INFO L168 Benchmark]: RCFGBuilder took 345.56 ms. Allocated memory is still 86.0 MB. Free memory was 61.4 MB in the beginning and 49.2 MB in the end (delta: 12.3 MB). Peak memory consumption was 12.6 MB. Max. memory is 16.1 GB. [2020-11-28 03:03:19,254 INFO L168 Benchmark]: TraceAbstraction took 2312.11 ms. Allocated memory was 86.0 MB in the beginning and 104.9 MB in the end (delta: 18.9 MB). Free memory was 48.5 MB in the beginning and 35.3 MB in the end (delta: 13.2 MB). Peak memory consumption was 33.8 MB. Max. memory is 16.1 GB. [2020-11-28 03:03:19,255 INFO L168 Benchmark]: Witness Printer took 60.03 ms. Allocated memory is still 104.9 MB. Free memory was 35.3 MB in the beginning and 80.0 MB in the end (delta: -44.7 MB). Peak memory consumption was 2.2 MB. Max. memory is 16.1 GB. [2020-11-28 03:03:19,258 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.25 ms. Allocated memory is still 86.0 MB. Free memory was 47.4 MB in the beginning and 47.4 MB in the end (delta: 34.4 kB). There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 275.91 ms. Allocated memory is still 86.0 MB. Free memory was 54.2 MB in the beginning and 63.9 MB in the end (delta: -9.7 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. * Boogie Procedure Inliner took 33.37 ms. Allocated memory is still 86.0 MB. Free memory was 63.9 MB in the beginning and 62.5 MB in the end (delta: 1.4 MB). There was no memory consumed. Max. memory is 16.1 GB. * Boogie Preprocessor took 20.26 ms. Allocated memory is still 86.0 MB. Free memory was 62.5 MB in the beginning and 61.4 MB in the end (delta: 1.0 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * RCFGBuilder took 345.56 ms. Allocated memory is still 86.0 MB. Free memory was 61.4 MB in the beginning and 49.2 MB in the end (delta: 12.3 MB). Peak memory consumption was 12.6 MB. Max. memory is 16.1 GB. * TraceAbstraction took 2312.11 ms. Allocated memory was 86.0 MB in the beginning and 104.9 MB in the end (delta: 18.9 MB). Free memory was 48.5 MB in the beginning and 35.3 MB in the end (delta: 13.2 MB). Peak memory consumption was 33.8 MB. Max. memory is 16.1 GB. * Witness Printer took 60.03 ms. Allocated memory is still 104.9 MB. Free memory was 35.3 MB in the beginning and 80.0 MB in the end (delta: -44.7 MB). Peak memory consumption was 2.2 MB. Max. memory is 16.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 3]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L28] int m = __VERIFIER_nondet_int(); [L29] COND FALSE !(m < 0 || m > 3) [L34] int n = __VERIFIER_nondet_int(); [L35] COND FALSE !(n < 0 || n > 23) [L41] CALL, EXPR ackermann(m,n) VAL [\old(m)=2, \old(n)=0] [L17] COND FALSE !(m==0) VAL [\old(m)=2, \old(n)=0, m=2, n=0] [L20] COND TRUE n==0 VAL [\old(m)=2, \old(n)=0, m=2, n=0] [L21] CALL, EXPR ackermann(m-1,1) VAL [\old(m)=1, \old(n)=1] [L17] COND FALSE !(m==0) VAL [\old(m)=1, \old(n)=1, m=1, n=1] [L20] COND FALSE !(n==0) VAL [\old(m)=1, \old(n)=1, m=1, n=1] [L23] CALL, EXPR ackermann(m,n-1) VAL [\old(m)=1, \old(n)=0] [L17] COND FALSE !(m==0) VAL [\old(m)=1, \old(n)=0, m=1, n=0] [L20] COND TRUE n==0 VAL [\old(m)=1, \old(n)=0, m=1, n=0] [L21] CALL, EXPR ackermann(m-1,1) VAL [\old(m)=0, \old(n)=1] [L17] COND TRUE m==0 [L18] return n+1; VAL [\old(m)=0, \old(n)=1, \result=2, m=0, n=1] [L21] RET, EXPR ackermann(m-1,1) VAL [\old(m)=1, \old(n)=0, ackermann(m-1,1)=2, m=1, n=0] [L21] return ackermann(m-1,1); [L23] RET, EXPR ackermann(m,n-1) VAL [\old(m)=1, \old(n)=1, ackermann(m,n-1)=2, m=1, n=1] [L23] CALL, EXPR ackermann(m-1,ackermann(m,n-1)) VAL [\old(m)=0, \old(n)=2] [L17] COND TRUE m==0 [L18] return n+1; VAL [\old(m)=0, \old(n)=2, \result=3, m=0, n=2] [L23] RET, EXPR ackermann(m-1,ackermann(m,n-1)) VAL [\old(m)=1, \old(n)=1, ackermann(m,n-1)=2, ackermann(m-1,ackermann(m,n-1))=3, m=1, n=1] [L23] return ackermann(m-1,ackermann(m,n-1)); [L21] RET, EXPR ackermann(m-1,1) VAL [\old(m)=2, \old(n)=0, ackermann(m-1,1)=3, m=2, n=0] [L21] return ackermann(m-1,1); [L41] RET, EXPR ackermann(m,n) [L41] int result = ackermann(m,n); [L42] COND FALSE !(m < 2 || result >= 4) [L3] __assert_fail("0", "Ackermann02.c", 3, "reach_error") - StatisticsResult: Ultimate Automizer benchmark data CFG has 2 procedures, 24 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 2.1s, OverallIterations: 4, TraceHistogramMax: 5, AutomataDifference: 0.5s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 65 SDtfs, 46 SDslu, 124 SDs, 0 SdLazy, 137 SolverSat, 24 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.2s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 74 GetRequests, 56 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.2s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=34occurred in iteration=3, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 3 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.2s SatisfiabilityAnalysisTime, 0.5s InterpolantComputationTime, 141 NumberOfCodeBlocks, 141 NumberOfCodeBlocksAsserted, 7 NumberOfCheckSat, 97 ConstructedInterpolants, 0 QuantifiedInterpolants, 3521 SizeOfPredicates, 4 NumberOfNonLiveVariables, 194 ConjunctsInSsa, 9 ConjunctsInUnsatCore, 5 InterpolantComputations, 1 PerfectInterpolantSequences, 32/38 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! Received shutdown request...