./Ultimate.py --spec ../../sv-benchmarks/c/ReachSafety.prp --file ../../sv-benchmarks/c/recursive-simple/id_o10_false-unreach-call_true-termination_true-no-overflow.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 5842f4b8 Calling Ultimate with: java -Dosgi.configuration.area=/tmp/vcloud-vcloud-master/worker/working_dir_b2910144-21bd-4974-b492-971a7d04e634/bin-2019/uautomizer/data/config -Xmx12G -Xms1G -jar /tmp/vcloud-vcloud-master/worker/working_dir_b2910144-21bd-4974-b492-971a7d04e634/bin-2019/uautomizer/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/working_dir_b2910144-21bd-4974-b492-971a7d04e634/bin-2019/uautomizer/data -tc /tmp/vcloud-vcloud-master/worker/working_dir_b2910144-21bd-4974-b492-971a7d04e634/bin-2019/uautomizer/config/AutomizerReach.xml -i ../../sv-benchmarks/c/recursive-simple/id_o10_false-unreach-call_true-termination_true-no-overflow.c -s /tmp/vcloud-vcloud-master/worker/working_dir_b2910144-21bd-4974-b492-971a7d04e634/bin-2019/uautomizer/config/svcomp-Reach-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/working_dir_b2910144-21bd-4974-b492-971a7d04e634/bin-2019/uautomizer --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(__VERIFIER_error())) ) --witnessprinter.graph.data.producer Automizer --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 0c292d0c9d9c055df9398b3303a92d6621b60758 ............................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... 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 0.1.23-5842f4b [2018-11-18 13:18:49,862 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-11-18 13:18:49,863 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-11-18 13:18:49,869 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-11-18 13:18:49,869 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-11-18 13:18:49,870 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-11-18 13:18:49,871 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-11-18 13:18:49,872 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-11-18 13:18:49,873 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-11-18 13:18:49,874 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-11-18 13:18:49,875 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-11-18 13:18:49,875 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-11-18 13:18:49,876 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-11-18 13:18:49,876 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-11-18 13:18:49,877 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-11-18 13:18:49,877 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-11-18 13:18:49,878 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-11-18 13:18:49,879 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-11-18 13:18:49,880 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-11-18 13:18:49,880 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-11-18 13:18:49,881 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-11-18 13:18:49,882 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-11-18 13:18:49,884 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-11-18 13:18:49,884 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-11-18 13:18:49,884 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-11-18 13:18:49,885 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-11-18 13:18:49,886 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-11-18 13:18:49,886 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-11-18 13:18:49,887 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-11-18 13:18:49,887 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-11-18 13:18:49,887 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-11-18 13:18:49,888 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-11-18 13:18:49,888 INFO L177 SettingsManager]: ReqParser provides no preferences, ignoring... [2018-11-18 13:18:49,888 INFO L174 SettingsManager]: Resetting SmtParser preferences to default values [2018-11-18 13:18:49,889 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-11-18 13:18:49,889 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-11-18 13:18:49,889 INFO L98 SettingsManager]: Beginning loading settings from /tmp/vcloud-vcloud-master/worker/working_dir_b2910144-21bd-4974-b492-971a7d04e634/bin-2019/uautomizer/config/svcomp-Reach-32bit-Automizer_Default.epf [2018-11-18 13:18:49,896 INFO L110 SettingsManager]: Loading preferences was successful [2018-11-18 13:18:49,897 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-11-18 13:18:49,897 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-11-18 13:18:49,897 INFO L133 SettingsManager]: * to procedures, called more than once=true [2018-11-18 13:18:49,898 INFO L131 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2018-11-18 13:18:49,898 INFO L133 SettingsManager]: * Create parallel compositions if possible=false [2018-11-18 13:18:49,898 INFO L133 SettingsManager]: * Use SBE=true [2018-11-18 13:18:49,898 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-11-18 13:18:49,898 INFO L133 SettingsManager]: * sizeof long=4 [2018-11-18 13:18:49,899 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-11-18 13:18:49,899 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-11-18 13:18:49,899 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-11-18 13:18:49,899 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-11-18 13:18:49,899 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-11-18 13:18:49,899 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-11-18 13:18:49,899 INFO L133 SettingsManager]: * sizeof long double=12 [2018-11-18 13:18:49,899 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-11-18 13:18:49,900 INFO L133 SettingsManager]: * Use constant arrays=true [2018-11-18 13:18:49,900 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-11-18 13:18:49,900 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-11-18 13:18:49,900 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-11-18 13:18:49,900 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-11-18 13:18:49,900 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-11-18 13:18:49,900 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-11-18 13:18:49,901 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-11-18 13:18:49,901 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-11-18 13:18:49,901 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-11-18 13:18:49,901 INFO L133 SettingsManager]: * Trace refinement strategy=CAMEL [2018-11-18 13:18:49,901 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-11-18 13:18:49,901 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-11-18 13:18:49,901 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true 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/working_dir_b2910144-21bd-4974-b492-971a7d04e634/bin-2019/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(__VERIFIER_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 -> 0c292d0c9d9c055df9398b3303a92d6621b60758 [2018-11-18 13:18:49,926 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-11-18 13:18:49,935 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-11-18 13:18:49,937 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-11-18 13:18:49,938 INFO L271 PluginConnector]: Initializing CDTParser... [2018-11-18 13:18:49,939 INFO L276 PluginConnector]: CDTParser initialized [2018-11-18 13:18:49,939 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/working_dir_b2910144-21bd-4974-b492-971a7d04e634/bin-2019/uautomizer/../../sv-benchmarks/c/recursive-simple/id_o10_false-unreach-call_true-termination_true-no-overflow.c [2018-11-18 13:18:49,986 INFO L221 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/working_dir_b2910144-21bd-4974-b492-971a7d04e634/bin-2019/uautomizer/data/1894dbfd9/df3d37cceb2a4fc296311760e5bbfefd/FLAGd2d368a92 [2018-11-18 13:18:50,321 INFO L307 CDTParser]: Found 1 translation units. [2018-11-18 13:18:50,321 INFO L161 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/working_dir_b2910144-21bd-4974-b492-971a7d04e634/sv-benchmarks/c/recursive-simple/id_o10_false-unreach-call_true-termination_true-no-overflow.c [2018-11-18 13:18:50,326 INFO L355 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/working_dir_b2910144-21bd-4974-b492-971a7d04e634/bin-2019/uautomizer/data/1894dbfd9/df3d37cceb2a4fc296311760e5bbfefd/FLAGd2d368a92 [2018-11-18 13:18:50,743 INFO L363 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/working_dir_b2910144-21bd-4974-b492-971a7d04e634/bin-2019/uautomizer/data/1894dbfd9/df3d37cceb2a4fc296311760e5bbfefd [2018-11-18 13:18:50,746 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-11-18 13:18:50,747 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2018-11-18 13:18:50,748 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-11-18 13:18:50,748 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-11-18 13:18:50,751 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-11-18 13:18:50,752 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.11 01:18:50" (1/1) ... [2018-11-18 13:18:50,754 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@51d0d35e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 01:18:50, skipping insertion in model container [2018-11-18 13:18:50,754 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.11 01:18:50" (1/1) ... [2018-11-18 13:18:50,760 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-11-18 13:18:50,772 INFO L176 MainTranslator]: Built tables and reachable declarations [2018-11-18 13:18:50,872 INFO L201 PostProcessor]: Analyzing one entry point: main [2018-11-18 13:18:50,874 INFO L191 MainTranslator]: Completed pre-run [2018-11-18 13:18:50,882 INFO L201 PostProcessor]: Analyzing one entry point: main [2018-11-18 13:18:50,891 INFO L195 MainTranslator]: Completed translation [2018-11-18 13:18:50,891 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 01:18:50 WrapperNode [2018-11-18 13:18:50,891 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-11-18 13:18:50,892 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-11-18 13:18:50,892 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-11-18 13:18:50,892 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-11-18 13:18:50,899 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 01:18:50" (1/1) ... [2018-11-18 13:18:50,900 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 01:18:50" (1/1) ... [2018-11-18 13:18:50,902 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 01:18:50" (1/1) ... [2018-11-18 13:18:50,903 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 01:18:50" (1/1) ... [2018-11-18 13:18:50,904 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 01:18:50" (1/1) ... [2018-11-18 13:18:50,906 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 01:18:50" (1/1) ... [2018-11-18 13:18:50,906 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 01:18:50" (1/1) ... [2018-11-18 13:18:50,907 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-11-18 13:18:50,907 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-11-18 13:18:50,907 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-11-18 13:18:50,907 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-11-18 13:18:50,908 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 01:18:50" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_b2910144-21bd-4974-b492-971a7d04e634/bin-2019/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 [2018-11-18 13:18:50,977 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-11-18 13:18:50,977 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-11-18 13:18:50,977 INFO L138 BoogieDeclarations]: Found implementation of procedure id [2018-11-18 13:18:50,977 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-11-18 13:18:50,977 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2018-11-18 13:18:50,977 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2018-11-18 13:18:50,977 INFO L130 BoogieDeclarations]: Found specification of procedure id [2018-11-18 13:18:50,978 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-11-18 13:18:50,978 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-11-18 13:18:50,978 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-11-18 13:18:51,060 INFO L278 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-11-18 13:18:51,061 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.11 01:18:51 BoogieIcfgContainer [2018-11-18 13:18:51,061 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-11-18 13:18:51,061 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-11-18 13:18:51,061 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-11-18 13:18:51,063 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-11-18 13:18:51,063 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 18.11 01:18:50" (1/3) ... [2018-11-18 13:18:51,064 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2d07e275 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.11 01:18:51, skipping insertion in model container [2018-11-18 13:18:51,064 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 01:18:50" (2/3) ... [2018-11-18 13:18:51,064 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2d07e275 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.11 01:18:51, skipping insertion in model container [2018-11-18 13:18:51,064 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.11 01:18:51" (3/3) ... [2018-11-18 13:18:51,065 INFO L112 eAbstractionObserver]: Analyzing ICFG id_o10_false-unreach-call_true-termination_true-no-overflow.c [2018-11-18 13:18:51,071 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-11-18 13:18:51,076 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-11-18 13:18:51,084 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-11-18 13:18:51,103 INFO L133 ementStrategyFactory]: Using default assertion order modulation [2018-11-18 13:18:51,104 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-11-18 13:18:51,104 INFO L383 AbstractCegarLoop]: Hoare is true [2018-11-18 13:18:51,104 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-11-18 13:18:51,104 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-11-18 13:18:51,104 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-11-18 13:18:51,104 INFO L387 AbstractCegarLoop]: Difference is false [2018-11-18 13:18:51,104 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-11-18 13:18:51,104 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-11-18 13:18:51,116 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states. [2018-11-18 13:18:51,121 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2018-11-18 13:18:51,122 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 13:18:51,122 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 13:18:51,124 INFO L423 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 13:18:51,129 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 13:18:51,129 INFO L82 PathProgramCache]: Analyzing trace with hash -872342019, now seen corresponding path program 1 times [2018-11-18 13:18:51,131 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-11-18 13:18:51,131 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-11-18 13:18:51,167 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 13:18:51,168 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-18 13:18:51,168 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 13:18:51,202 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 13:18:51,317 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-18 13:18:51,319 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-11-18 13:18:51,319 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2018-11-18 13:18:51,322 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-11-18 13:18:51,330 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-11-18 13:18:51,330 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2018-11-18 13:18:51,332 INFO L87 Difference]: Start difference. First operand 20 states. Second operand 5 states. [2018-11-18 13:18:51,375 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 13:18:51,375 INFO L93 Difference]: Finished difference Result 32 states and 35 transitions. [2018-11-18 13:18:51,375 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-11-18 13:18:51,376 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2018-11-18 13:18:51,377 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 13:18:51,382 INFO L225 Difference]: With dead ends: 32 [2018-11-18 13:18:51,382 INFO L226 Difference]: Without dead ends: 18 [2018-11-18 13:18:51,384 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2018-11-18 13:18:51,395 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2018-11-18 13:18:51,408 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2018-11-18 13:18:51,409 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2018-11-18 13:18:51,410 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2018-11-18 13:18:51,411 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 13 [2018-11-18 13:18:51,411 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 13:18:51,411 INFO L480 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2018-11-18 13:18:51,411 INFO L481 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-11-18 13:18:51,411 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2018-11-18 13:18:51,412 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2018-11-18 13:18:51,412 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 13:18:51,412 INFO L375 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 13:18:51,413 INFO L423 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 13:18:51,413 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 13:18:51,413 INFO L82 PathProgramCache]: Analyzing trace with hash -953570577, now seen corresponding path program 1 times [2018-11-18 13:18:51,413 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-11-18 13:18:51,413 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-11-18 13:18:51,414 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 13:18:51,414 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-18 13:18:51,414 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 13:18:51,421 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 13:18:51,548 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-11-18 13:18:51,549 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 13:18:51,549 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_b2910144-21bd-4974-b492-971a7d04e634/bin-2019/uautomizer/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-18 13:18:51,564 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-18 13:18:51,573 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 13:18:51,577 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 13:18:51,619 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-11-18 13:18:51,637 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-11-18 13:18:51,637 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 8 [2018-11-18 13:18:51,637 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-11-18 13:18:51,638 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-11-18 13:18:51,638 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2018-11-18 13:18:51,638 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand 8 states. [2018-11-18 13:18:51,673 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 13:18:51,673 INFO L93 Difference]: Finished difference Result 25 states and 26 transitions. [2018-11-18 13:18:51,673 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-11-18 13:18:51,674 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 19 [2018-11-18 13:18:51,674 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 13:18:51,674 INFO L225 Difference]: With dead ends: 25 [2018-11-18 13:18:51,674 INFO L226 Difference]: Without dead ends: 21 [2018-11-18 13:18:51,675 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 18 SyntacticMatches, 1 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2018-11-18 13:18:51,676 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2018-11-18 13:18:51,678 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2018-11-18 13:18:51,679 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2018-11-18 13:18:51,679 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2018-11-18 13:18:51,679 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 19 [2018-11-18 13:18:51,680 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 13:18:51,680 INFO L480 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2018-11-18 13:18:51,680 INFO L481 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-11-18 13:18:51,680 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2018-11-18 13:18:51,680 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2018-11-18 13:18:51,681 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 13:18:51,681 INFO L375 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 13:18:51,681 INFO L423 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 13:18:51,681 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 13:18:51,681 INFO L82 PathProgramCache]: Analyzing trace with hash 397359997, now seen corresponding path program 2 times [2018-11-18 13:18:51,681 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-11-18 13:18:51,682 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-11-18 13:18:51,682 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 13:18:51,682 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-18 13:18:51,683 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 13:18:51,692 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 13:18:51,831 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2018-11-18 13:18:51,831 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 13:18:51,832 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_b2910144-21bd-4974-b492-971a7d04e634/bin-2019/uautomizer/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-18 13:18:51,845 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-11-18 13:18:51,868 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-11-18 13:18:51,869 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-18 13:18:51,870 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 13:18:51,905 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2018-11-18 13:18:51,921 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-11-18 13:18:51,921 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 10 [2018-11-18 13:18:51,921 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-11-18 13:18:51,921 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-11-18 13:18:51,922 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=72, Unknown=0, NotChecked=0, Total=90 [2018-11-18 13:18:51,922 INFO L87 Difference]: Start difference. First operand 21 states and 22 transitions. Second operand 10 states. [2018-11-18 13:18:51,954 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 13:18:51,955 INFO L93 Difference]: Finished difference Result 28 states and 29 transitions. [2018-11-18 13:18:51,955 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-11-18 13:18:51,955 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 25 [2018-11-18 13:18:51,955 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 13:18:51,956 INFO L225 Difference]: With dead ends: 28 [2018-11-18 13:18:51,956 INFO L226 Difference]: Without dead ends: 24 [2018-11-18 13:18:51,956 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 24 SyntacticMatches, 1 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=18, Invalid=72, Unknown=0, NotChecked=0, Total=90 [2018-11-18 13:18:51,957 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2018-11-18 13:18:51,959 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2018-11-18 13:18:51,960 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2018-11-18 13:18:51,960 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 25 transitions. [2018-11-18 13:18:51,960 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 25 transitions. Word has length 25 [2018-11-18 13:18:51,961 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 13:18:51,961 INFO L480 AbstractCegarLoop]: Abstraction has 24 states and 25 transitions. [2018-11-18 13:18:51,961 INFO L481 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-11-18 13:18:51,961 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 25 transitions. [2018-11-18 13:18:51,961 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2018-11-18 13:18:51,961 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 13:18:51,961 INFO L375 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 13:18:51,962 INFO L423 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 13:18:51,962 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 13:18:51,962 INFO L82 PathProgramCache]: Analyzing trace with hash 1198310127, now seen corresponding path program 3 times [2018-11-18 13:18:51,962 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-11-18 13:18:51,962 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-11-18 13:18:51,963 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 13:18:51,963 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-18 13:18:51,963 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 13:18:51,974 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 13:18:52,097 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-11-18 13:18:52,097 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 13:18:52,097 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_b2910144-21bd-4974-b492-971a7d04e634/bin-2019/uautomizer/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-18 13:18:52,113 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-18 13:18:52,129 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2018-11-18 13:18:52,130 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-18 13:18:52,132 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 13:18:52,173 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-11-18 13:18:52,188 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-11-18 13:18:52,188 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 12 [2018-11-18 13:18:52,188 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-11-18 13:18:52,189 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-11-18 13:18:52,189 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=110, Unknown=0, NotChecked=0, Total=132 [2018-11-18 13:18:52,189 INFO L87 Difference]: Start difference. First operand 24 states and 25 transitions. Second operand 12 states. [2018-11-18 13:18:52,223 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 13:18:52,223 INFO L93 Difference]: Finished difference Result 31 states and 32 transitions. [2018-11-18 13:18:52,224 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-11-18 13:18:52,224 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 31 [2018-11-18 13:18:52,224 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 13:18:52,226 INFO L225 Difference]: With dead ends: 31 [2018-11-18 13:18:52,226 INFO L226 Difference]: Without dead ends: 27 [2018-11-18 13:18:52,226 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 30 SyntacticMatches, 1 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=22, Invalid=110, Unknown=0, NotChecked=0, Total=132 [2018-11-18 13:18:52,226 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2018-11-18 13:18:52,233 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2018-11-18 13:18:52,234 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2018-11-18 13:18:52,234 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 28 transitions. [2018-11-18 13:18:52,235 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 28 transitions. Word has length 31 [2018-11-18 13:18:52,235 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 13:18:52,235 INFO L480 AbstractCegarLoop]: Abstraction has 27 states and 28 transitions. [2018-11-18 13:18:52,235 INFO L481 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-11-18 13:18:52,235 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 28 transitions. [2018-11-18 13:18:52,236 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2018-11-18 13:18:52,236 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 13:18:52,236 INFO L375 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 13:18:52,236 INFO L423 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 13:18:52,236 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 13:18:52,237 INFO L82 PathProgramCache]: Analyzing trace with hash 1080764669, now seen corresponding path program 4 times [2018-11-18 13:18:52,237 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-11-18 13:18:52,237 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-11-18 13:18:52,237 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 13:18:52,237 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-18 13:18:52,238 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 13:18:52,247 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 13:18:52,385 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2018-11-18 13:18:52,385 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 13:18:52,385 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_b2910144-21bd-4974-b492-971a7d04e634/bin-2019/uautomizer/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-18 13:18:52,390 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-18 13:18:52,399 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-18 13:18:52,400 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-18 13:18:52,402 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 13:18:52,429 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2018-11-18 13:18:52,453 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-11-18 13:18:52,453 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 14 [2018-11-18 13:18:52,454 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-11-18 13:18:52,454 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-11-18 13:18:52,454 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=156, Unknown=0, NotChecked=0, Total=182 [2018-11-18 13:18:52,454 INFO L87 Difference]: Start difference. First operand 27 states and 28 transitions. Second operand 14 states. [2018-11-18 13:18:52,497 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 13:18:52,498 INFO L93 Difference]: Finished difference Result 34 states and 35 transitions. [2018-11-18 13:18:52,498 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-11-18 13:18:52,498 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 37 [2018-11-18 13:18:52,498 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 13:18:52,499 INFO L225 Difference]: With dead ends: 34 [2018-11-18 13:18:52,499 INFO L226 Difference]: Without dead ends: 30 [2018-11-18 13:18:52,499 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 36 SyntacticMatches, 1 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=26, Invalid=156, Unknown=0, NotChecked=0, Total=182 [2018-11-18 13:18:52,500 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2018-11-18 13:18:52,504 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2018-11-18 13:18:52,504 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2018-11-18 13:18:52,505 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 31 transitions. [2018-11-18 13:18:52,505 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 31 transitions. Word has length 37 [2018-11-18 13:18:52,505 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 13:18:52,505 INFO L480 AbstractCegarLoop]: Abstraction has 30 states and 31 transitions. [2018-11-18 13:18:52,506 INFO L481 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-11-18 13:18:52,506 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 31 transitions. [2018-11-18 13:18:52,507 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2018-11-18 13:18:52,507 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 13:18:52,507 INFO L375 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 13:18:52,507 INFO L423 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 13:18:52,508 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 13:18:52,508 INFO L82 PathProgramCache]: Analyzing trace with hash -1752970513, now seen corresponding path program 5 times [2018-11-18 13:18:52,508 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-11-18 13:18:52,508 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-11-18 13:18:52,509 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 13:18:52,509 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-18 13:18:52,509 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 13:18:52,517 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 13:18:52,689 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-11-18 13:18:52,690 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 13:18:52,690 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_b2910144-21bd-4974-b492-971a7d04e634/bin-2019/uautomizer/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-18 13:18:52,696 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-11-18 13:18:52,715 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2018-11-18 13:18:52,715 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-18 13:18:52,717 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 13:18:52,737 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-11-18 13:18:52,753 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-11-18 13:18:52,753 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15] total 16 [2018-11-18 13:18:52,753 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-11-18 13:18:52,754 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-11-18 13:18:52,754 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=210, Unknown=0, NotChecked=0, Total=240 [2018-11-18 13:18:52,754 INFO L87 Difference]: Start difference. First operand 30 states and 31 transitions. Second operand 16 states. [2018-11-18 13:18:52,817 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 13:18:52,817 INFO L93 Difference]: Finished difference Result 37 states and 38 transitions. [2018-11-18 13:18:52,818 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-11-18 13:18:52,818 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 43 [2018-11-18 13:18:52,818 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 13:18:52,819 INFO L225 Difference]: With dead ends: 37 [2018-11-18 13:18:52,819 INFO L226 Difference]: Without dead ends: 33 [2018-11-18 13:18:52,820 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 42 SyntacticMatches, 1 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=30, Invalid=210, Unknown=0, NotChecked=0, Total=240 [2018-11-18 13:18:52,820 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2018-11-18 13:18:52,824 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2018-11-18 13:18:52,824 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2018-11-18 13:18:52,825 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 34 transitions. [2018-11-18 13:18:52,825 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 34 transitions. Word has length 43 [2018-11-18 13:18:52,825 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 13:18:52,825 INFO L480 AbstractCegarLoop]: Abstraction has 33 states and 34 transitions. [2018-11-18 13:18:52,825 INFO L481 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-11-18 13:18:52,825 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 34 transitions. [2018-11-18 13:18:52,826 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2018-11-18 13:18:52,826 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 13:18:52,826 INFO L375 BasicCegarLoop]: trace histogram [7, 7, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 13:18:52,827 INFO L423 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 13:18:52,827 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 13:18:52,827 INFO L82 PathProgramCache]: Analyzing trace with hash -1590630787, now seen corresponding path program 6 times [2018-11-18 13:18:52,827 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-11-18 13:18:52,827 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-11-18 13:18:52,828 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 13:18:52,828 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-18 13:18:52,828 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 13:18:52,837 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 13:18:53,036 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2018-11-18 13:18:53,036 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 13:18:53,036 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_b2910144-21bd-4974-b492-971a7d04e634/bin-2019/uautomizer/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-18 13:18:53,049 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-11-18 13:18:53,074 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2018-11-18 13:18:53,075 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-18 13:18:53,077 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 13:18:53,124 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2018-11-18 13:18:53,149 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-11-18 13:18:53,149 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17] total 18 [2018-11-18 13:18:53,149 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-11-18 13:18:53,150 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-11-18 13:18:53,150 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=272, Unknown=0, NotChecked=0, Total=306 [2018-11-18 13:18:53,150 INFO L87 Difference]: Start difference. First operand 33 states and 34 transitions. Second operand 18 states. [2018-11-18 13:18:53,218 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 13:18:53,218 INFO L93 Difference]: Finished difference Result 40 states and 41 transitions. [2018-11-18 13:18:53,219 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-11-18 13:18:53,219 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 49 [2018-11-18 13:18:53,219 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 13:18:53,219 INFO L225 Difference]: With dead ends: 40 [2018-11-18 13:18:53,220 INFO L226 Difference]: Without dead ends: 36 [2018-11-18 13:18:53,220 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 48 SyntacticMatches, 1 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=34, Invalid=272, Unknown=0, NotChecked=0, Total=306 [2018-11-18 13:18:53,220 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2018-11-18 13:18:53,222 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2018-11-18 13:18:53,223 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2018-11-18 13:18:53,223 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 37 transitions. [2018-11-18 13:18:53,223 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 37 transitions. Word has length 49 [2018-11-18 13:18:53,223 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 13:18:53,224 INFO L480 AbstractCegarLoop]: Abstraction has 36 states and 37 transitions. [2018-11-18 13:18:53,224 INFO L481 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-11-18 13:18:53,224 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 37 transitions. [2018-11-18 13:18:53,224 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2018-11-18 13:18:53,224 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 13:18:53,224 INFO L375 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 13:18:53,225 INFO L423 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 13:18:53,225 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 13:18:53,225 INFO L82 PathProgramCache]: Analyzing trace with hash 1532150511, now seen corresponding path program 7 times [2018-11-18 13:18:53,225 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-11-18 13:18:53,225 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-11-18 13:18:53,226 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 13:18:53,226 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-18 13:18:53,226 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 13:18:53,234 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 13:18:53,421 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2018-11-18 13:18:53,421 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 13:18:53,421 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_b2910144-21bd-4974-b492-971a7d04e634/bin-2019/uautomizer/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-18 13:18:53,427 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-18 13:18:53,437 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 13:18:53,439 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 13:18:53,473 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2018-11-18 13:18:53,489 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-11-18 13:18:53,489 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19] total 20 [2018-11-18 13:18:53,490 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-11-18 13:18:53,490 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-11-18 13:18:53,490 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=342, Unknown=0, NotChecked=0, Total=380 [2018-11-18 13:18:53,490 INFO L87 Difference]: Start difference. First operand 36 states and 37 transitions. Second operand 20 states. [2018-11-18 13:18:53,566 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 13:18:53,567 INFO L93 Difference]: Finished difference Result 43 states and 44 transitions. [2018-11-18 13:18:53,567 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-11-18 13:18:53,567 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 55 [2018-11-18 13:18:53,567 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 13:18:53,568 INFO L225 Difference]: With dead ends: 43 [2018-11-18 13:18:53,568 INFO L226 Difference]: Without dead ends: 39 [2018-11-18 13:18:53,568 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 54 SyntacticMatches, 1 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=38, Invalid=342, Unknown=0, NotChecked=0, Total=380 [2018-11-18 13:18:53,569 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2018-11-18 13:18:53,572 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2018-11-18 13:18:53,572 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2018-11-18 13:18:53,573 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 40 transitions. [2018-11-18 13:18:53,573 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 40 transitions. Word has length 55 [2018-11-18 13:18:53,573 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 13:18:53,573 INFO L480 AbstractCegarLoop]: Abstraction has 39 states and 40 transitions. [2018-11-18 13:18:53,573 INFO L481 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-11-18 13:18:53,573 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 40 transitions. [2018-11-18 13:18:53,574 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2018-11-18 13:18:53,574 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 13:18:53,574 INFO L375 BasicCegarLoop]: trace histogram [9, 9, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 13:18:53,575 INFO L423 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 13:18:53,575 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 13:18:53,575 INFO L82 PathProgramCache]: Analyzing trace with hash 1140618237, now seen corresponding path program 8 times [2018-11-18 13:18:53,575 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-11-18 13:18:53,575 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-11-18 13:18:53,576 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 13:18:53,576 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-18 13:18:53,576 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 13:18:53,583 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 13:18:53,797 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2018-11-18 13:18:53,797 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 13:18:53,798 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_b2910144-21bd-4974-b492-971a7d04e634/bin-2019/uautomizer/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-18 13:18:53,803 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-11-18 13:18:53,815 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-11-18 13:18:53,815 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-18 13:18:53,817 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 13:18:53,854 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2018-11-18 13:18:53,869 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-11-18 13:18:53,870 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21] total 22 [2018-11-18 13:18:53,870 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-11-18 13:18:53,870 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-11-18 13:18:53,871 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=420, Unknown=0, NotChecked=0, Total=462 [2018-11-18 13:18:53,871 INFO L87 Difference]: Start difference. First operand 39 states and 40 transitions. Second operand 22 states. [2018-11-18 13:18:53,964 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 13:18:53,964 INFO L93 Difference]: Finished difference Result 46 states and 47 transitions. [2018-11-18 13:18:53,965 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-11-18 13:18:53,965 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 61 [2018-11-18 13:18:53,965 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 13:18:53,966 INFO L225 Difference]: With dead ends: 46 [2018-11-18 13:18:53,966 INFO L226 Difference]: Without dead ends: 42 [2018-11-18 13:18:53,966 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 60 SyntacticMatches, 1 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=42, Invalid=420, Unknown=0, NotChecked=0, Total=462 [2018-11-18 13:18:53,966 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2018-11-18 13:18:53,970 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2018-11-18 13:18:53,970 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2018-11-18 13:18:53,971 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 43 transitions. [2018-11-18 13:18:53,971 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 43 transitions. Word has length 61 [2018-11-18 13:18:53,971 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 13:18:53,971 INFO L480 AbstractCegarLoop]: Abstraction has 42 states and 43 transitions. [2018-11-18 13:18:53,971 INFO L481 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-11-18 13:18:53,971 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 43 transitions. [2018-11-18 13:18:53,972 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2018-11-18 13:18:53,972 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 13:18:53,972 INFO L375 BasicCegarLoop]: trace histogram [10, 10, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 13:18:53,972 INFO L423 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 13:18:53,972 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 13:18:53,973 INFO L82 PathProgramCache]: Analyzing trace with hash -1749177617, now seen corresponding path program 9 times [2018-11-18 13:18:53,973 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-11-18 13:18:53,973 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-11-18 13:18:53,973 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 13:18:53,973 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-18 13:18:53,973 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 13:18:53,978 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 13:18:54,226 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2018-11-18 13:18:54,226 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 13:18:54,226 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_b2910144-21bd-4974-b492-971a7d04e634/bin-2019/uautomizer/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-18 13:18:54,234 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-18 13:18:54,291 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2018-11-18 13:18:54,292 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-18 13:18:54,294 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 13:18:54,351 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2018-11-18 13:18:54,367 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-11-18 13:18:54,367 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23] total 24 [2018-11-18 13:18:54,368 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2018-11-18 13:18:54,368 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2018-11-18 13:18:54,368 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=506, Unknown=0, NotChecked=0, Total=552 [2018-11-18 13:18:54,368 INFO L87 Difference]: Start difference. First operand 42 states and 43 transitions. Second operand 24 states. [2018-11-18 13:18:54,487 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 13:18:54,487 INFO L93 Difference]: Finished difference Result 49 states and 50 transitions. [2018-11-18 13:18:54,488 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-11-18 13:18:54,488 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 67 [2018-11-18 13:18:54,488 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 13:18:54,489 INFO L225 Difference]: With dead ends: 49 [2018-11-18 13:18:54,489 INFO L226 Difference]: Without dead ends: 45 [2018-11-18 13:18:54,489 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 89 GetRequests, 66 SyntacticMatches, 1 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=46, Invalid=506, Unknown=0, NotChecked=0, Total=552 [2018-11-18 13:18:54,489 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2018-11-18 13:18:54,493 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2018-11-18 13:18:54,493 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2018-11-18 13:18:54,493 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 46 transitions. [2018-11-18 13:18:54,493 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 46 transitions. Word has length 67 [2018-11-18 13:18:54,494 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 13:18:54,494 INFO L480 AbstractCegarLoop]: Abstraction has 45 states and 46 transitions. [2018-11-18 13:18:54,494 INFO L481 AbstractCegarLoop]: Interpolant automaton has 24 states. [2018-11-18 13:18:54,494 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 46 transitions. [2018-11-18 13:18:54,495 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2018-11-18 13:18:54,495 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 13:18:54,495 INFO L375 BasicCegarLoop]: trace histogram [11, 11, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 13:18:54,495 INFO L423 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 13:18:54,495 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 13:18:54,496 INFO L82 PathProgramCache]: Analyzing trace with hash -1580609155, now seen corresponding path program 10 times [2018-11-18 13:18:54,496 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-11-18 13:18:54,496 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-11-18 13:18:54,496 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 13:18:54,497 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-18 13:18:54,497 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 13:18:54,526 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-11-18 13:18:54,542 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-11-18 13:18:54,553 INFO L442 BasicCegarLoop]: Counterexample might be feasible [2018-11-18 13:18:54,575 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 18.11 01:18:54 BoogieIcfgContainer [2018-11-18 13:18:54,575 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2018-11-18 13:18:54,576 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2018-11-18 13:18:54,576 INFO L271 PluginConnector]: Initializing Witness Printer... [2018-11-18 13:18:54,576 INFO L276 PluginConnector]: Witness Printer initialized [2018-11-18 13:18:54,576 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.11 01:18:51" (3/4) ... [2018-11-18 13:18:54,578 INFO L138 WitnessPrinter]: Generating witness for reachability counterexample [2018-11-18 13:18:54,615 INFO L145 WitnessManager]: Wrote witness to /tmp/vcloud-vcloud-master/worker/working_dir_b2910144-21bd-4974-b492-971a7d04e634/bin-2019/uautomizer/witness.graphml [2018-11-18 13:18:54,615 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2018-11-18 13:18:54,616 INFO L168 Benchmark]: Toolchain (without parser) took 3869.80 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 176.2 MB). Free memory was 959.2 MB in the beginning and 1.0 GB in the end (delta: -89.6 MB). Peak memory consumption was 86.6 MB. Max. memory is 11.5 GB. [2018-11-18 13:18:54,617 INFO L168 Benchmark]: CDTParser took 0.16 ms. Allocated memory is still 1.0 GB. Free memory is still 985.6 MB. There was no memory consumed. Max. memory is 11.5 GB. [2018-11-18 13:18:54,618 INFO L168 Benchmark]: CACSL2BoogieTranslator took 143.69 ms. Allocated memory is still 1.0 GB. Free memory was 959.2 MB in the beginning and 948.5 MB in the end (delta: 10.7 MB). Peak memory consumption was 10.7 MB. Max. memory is 11.5 GB. [2018-11-18 13:18:54,618 INFO L168 Benchmark]: Boogie Preprocessor took 15.16 ms. Allocated memory is still 1.0 GB. Free memory was 948.5 MB in the beginning and 945.8 MB in the end (delta: 2.7 MB). Peak memory consumption was 2.7 MB. Max. memory is 11.5 GB. [2018-11-18 13:18:54,618 INFO L168 Benchmark]: RCFGBuilder took 153.95 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 132.6 MB). Free memory was 945.8 MB in the beginning and 1.1 GB in the end (delta: -174.8 MB). Peak memory consumption was 19.4 MB. Max. memory is 11.5 GB. [2018-11-18 13:18:54,618 INFO L168 Benchmark]: TraceAbstraction took 3514.02 ms. Allocated memory was 1.2 GB in the beginning and 1.2 GB in the end (delta: 43.5 MB). Free memory was 1.1 GB in the beginning and 1.0 GB in the end (delta: 71.8 MB). Peak memory consumption was 115.3 MB. Max. memory is 11.5 GB. [2018-11-18 13:18:54,619 INFO L168 Benchmark]: Witness Printer took 39.76 ms. Allocated memory is still 1.2 GB. Free memory is still 1.0 GB. There was no memory consumed. Max. memory is 11.5 GB. [2018-11-18 13:18:54,620 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.16 ms. Allocated memory is still 1.0 GB. Free memory is still 985.6 MB. There was no memory consumed. Max. memory is 11.5 GB. * CACSL2BoogieTranslator took 143.69 ms. Allocated memory is still 1.0 GB. Free memory was 959.2 MB in the beginning and 948.5 MB in the end (delta: 10.7 MB). Peak memory consumption was 10.7 MB. Max. memory is 11.5 GB. * Boogie Preprocessor took 15.16 ms. Allocated memory is still 1.0 GB. Free memory was 948.5 MB in the beginning and 945.8 MB in the end (delta: 2.7 MB). Peak memory consumption was 2.7 MB. Max. memory is 11.5 GB. * RCFGBuilder took 153.95 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 132.6 MB). Free memory was 945.8 MB in the beginning and 1.1 GB in the end (delta: -174.8 MB). Peak memory consumption was 19.4 MB. Max. memory is 11.5 GB. * TraceAbstraction took 3514.02 ms. Allocated memory was 1.2 GB in the beginning and 1.2 GB in the end (delta: 43.5 MB). Free memory was 1.1 GB in the beginning and 1.0 GB in the end (delta: 71.8 MB). Peak memory consumption was 115.3 MB. Max. memory is 11.5 GB. * Witness Printer took 39.76 ms. Allocated memory is still 1.2 GB. Free memory is still 1.0 GB. There was no memory consumed. Max. memory is 11.5 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 13]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L10] unsigned int input = __VERIFIER_nondet_uint(); [L11] CALL, EXPR id(input) VAL [\old(x)=10] [L5] COND FALSE !(x==0) VAL [\old(x)=10, x=10] [L6] CALL, EXPR id(x-1) VAL [\old(x)=9] [L5] COND FALSE !(x==0) VAL [\old(x)=9, x=9] [L6] CALL, EXPR id(x-1) VAL [\old(x)=8] [L5] COND FALSE !(x==0) VAL [\old(x)=8, x=8] [L6] CALL, EXPR id(x-1) VAL [\old(x)=7] [L5] COND FALSE !(x==0) VAL [\old(x)=7, x=7] [L6] CALL, EXPR id(x-1) VAL [\old(x)=6] [L5] COND FALSE !(x==0) VAL [\old(x)=6, x=6] [L6] CALL, EXPR id(x-1) VAL [\old(x)=5] [L5] COND FALSE !(x==0) VAL [\old(x)=5, x=5] [L6] CALL, EXPR id(x-1) VAL [\old(x)=4] [L5] COND FALSE !(x==0) VAL [\old(x)=4, x=4] [L6] CALL, EXPR id(x-1) VAL [\old(x)=3] [L5] COND FALSE !(x==0) VAL [\old(x)=3, x=3] [L6] CALL, EXPR id(x-1) VAL [\old(x)=2] [L5] COND FALSE !(x==0) VAL [\old(x)=2, x=2] [L6] CALL, EXPR id(x-1) VAL [\old(x)=1] [L5] COND FALSE !(x==0) VAL [\old(x)=1, x=1] [L6] CALL, EXPR id(x-1) VAL [\old(x)=0] [L5] COND TRUE x==0 [L5] RET return 0; VAL [\old(x)=0, \result=0, x=0] [L6] EXPR id(x-1) VAL [\old(x)=1, id(x-1)=0, x=1] [L6] RET return id(x-1) + 1; [L6] EXPR id(x-1) VAL [\old(x)=2, id(x-1)=1, x=2] [L6] RET return id(x-1) + 1; [L6] EXPR id(x-1) VAL [\old(x)=3, id(x-1)=2, x=3] [L6] RET return id(x-1) + 1; [L6] EXPR id(x-1) VAL [\old(x)=4, id(x-1)=3, x=4] [L6] RET return id(x-1) + 1; [L6] EXPR id(x-1) VAL [\old(x)=5, id(x-1)=4, x=5] [L6] RET return id(x-1) + 1; [L6] EXPR id(x-1) VAL [\old(x)=6, id(x-1)=5, x=6] [L6] RET return id(x-1) + 1; [L6] EXPR id(x-1) VAL [\old(x)=7, id(x-1)=6, x=7] [L6] RET return id(x-1) + 1; [L6] EXPR id(x-1) VAL [\old(x)=8, id(x-1)=7, x=8] [L6] RET return id(x-1) + 1; [L6] EXPR id(x-1) VAL [\old(x)=9, id(x-1)=8, x=9] [L6] RET return id(x-1) + 1; [L6] EXPR id(x-1) VAL [\old(x)=10, id(x-1)=9, x=10] [L6] RET return id(x-1) + 1; [L11] EXPR id(input) VAL [id(input)=10, input=10] [L11] unsigned int result = id(input); [L12] COND TRUE result == 10 VAL [input=10, result=10] [L13] __VERIFIER_error() VAL [input=10, result=10] - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 20 locations, 1 error locations. UNSAFE Result, 3.4s OverallTime, 11 OverallIterations, 11 TraceHistogramMax, 0.6s AutomataDifference, 0.0s DeadEndRemovalTime, 0.0s HoareAnnotationTime, HoareTripleCheckerStatistics: 244 SDtfs, 2 SDslu, 2840 SDs, 0 SdLazy, 1200 SolverSat, 0 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.4s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 518 GetRequests, 380 SyntacticMatches, 9 SemanticMatches, 129 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.6s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=45occurred in iteration=10, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s AbstIntTime, 0 AbstIntIterations, 0 AbstIntStrong, NaN AbsIntWeakeningRatio, NaN AbsIntAvgWeakeningVarsNumRemoved, NaN AbsIntAvgWeakenedConjuncts, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 10 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TraceCheckStatistics: 0.0s SsaConstructionTime, 0.2s SatisfiabilityAnalysisTime, 2.0s InterpolantComputationTime, 860 NumberOfCodeBlocks, 860 NumberOfCodeBlocksAsserted, 46 NumberOfCheckSat, 768 ConstructedInterpolants, 0 QuantifiedInterpolants, 137208 SizeOfPredicates, 9 NumberOfNonLiveVariables, 810 ConjunctsInSsa, 252 ConjunctsInUnsatCore, 19 InterpolantComputations, 1 PerfectInterpolantSequences, 900/1800 InterpolantCoveringCapability, InvariantSynthesisStatistics: No data available, InterpolantConsolidationStatistics: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! Received shutdown request...