./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/recursive-simple/fibo_5-2.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_3f7de178-6e40-43f3-bb2b-990672eded76/bin/utaipan/data/config -Xmx15G -Xms4m -jar /tmp/vcloud-vcloud-master/worker/run_dir_3f7de178-6e40-43f3-bb2b-990672eded76/bin/utaipan/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/run_dir_3f7de178-6e40-43f3-bb2b-990672eded76/bin/utaipan/data -tc /tmp/vcloud-vcloud-master/worker/run_dir_3f7de178-6e40-43f3-bb2b-990672eded76/bin/utaipan/config/TaipanReach.xml -i ../../sv-benchmarks/c/recursive-simple/fibo_5-2.c -s /tmp/vcloud-vcloud-master/worker/run_dir_3f7de178-6e40-43f3-bb2b-990672eded76/bin/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/run_dir_3f7de178-6e40-43f3-bb2b-990672eded76/bin/utaipan --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 Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 063966206f80cef10873a8e49ae0985aad7f65cb ....................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... 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 [2020-11-22 13:03:47,546 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-11-22 13:03:47,549 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-11-22 13:03:47,654 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-11-22 13:03:47,655 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-11-22 13:03:47,662 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-11-22 13:03:47,666 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-11-22 13:03:47,674 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-11-22 13:03:47,679 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-11-22 13:03:47,682 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-11-22 13:03:47,684 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-11-22 13:03:47,686 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-11-22 13:03:47,686 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-11-22 13:03:47,694 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-11-22 13:03:47,696 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-11-22 13:03:47,698 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-11-22 13:03:47,699 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-11-22 13:03:47,701 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-11-22 13:03:47,707 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-11-22 13:03:47,710 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-11-22 13:03:47,716 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-11-22 13:03:47,717 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-11-22 13:03:47,720 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-11-22 13:03:47,721 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-11-22 13:03:47,727 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-11-22 13:03:47,728 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-11-22 13:03:47,728 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-11-22 13:03:47,730 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-11-22 13:03:47,731 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-11-22 13:03:47,732 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-11-22 13:03:47,732 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-11-22 13:03:47,734 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-11-22 13:03:47,736 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-11-22 13:03:47,737 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-11-22 13:03:47,738 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-11-22 13:03:47,739 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-11-22 13:03:47,739 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-11-22 13:03:47,740 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-11-22 13:03:47,740 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-11-22 13:03:47,741 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-11-22 13:03:47,742 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-11-22 13:03:47,744 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud-vcloud-master/worker/run_dir_3f7de178-6e40-43f3-bb2b-990672eded76/bin/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf [2020-11-22 13:03:47,789 INFO L113 SettingsManager]: Loading preferences was successful [2020-11-22 13:03:47,790 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-11-22 13:03:47,791 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2020-11-22 13:03:47,791 INFO L138 SettingsManager]: * User list type=DISABLED [2020-11-22 13:03:47,792 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2020-11-22 13:03:47,792 INFO L138 SettingsManager]: * Explicit value domain=true [2020-11-22 13:03:47,792 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2020-11-22 13:03:47,792 INFO L138 SettingsManager]: * Octagon Domain=false [2020-11-22 13:03:47,793 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2020-11-22 13:03:47,793 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2020-11-22 13:03:47,794 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2020-11-22 13:03:47,794 INFO L138 SettingsManager]: * Interval Domain=false [2020-11-22 13:03:47,795 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2020-11-22 13:03:47,795 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2020-11-22 13:03:47,795 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2020-11-22 13:03:47,796 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-11-22 13:03:47,796 INFO L138 SettingsManager]: * sizeof long=4 [2020-11-22 13:03:47,796 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-11-22 13:03:47,797 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-11-22 13:03:47,797 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-11-22 13:03:47,797 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-11-22 13:03:47,797 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-11-22 13:03:47,798 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-11-22 13:03:47,798 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2020-11-22 13:03:47,798 INFO L138 SettingsManager]: * sizeof long double=12 [2020-11-22 13:03:47,798 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-11-22 13:03:47,798 INFO L138 SettingsManager]: * Use constant arrays=true [2020-11-22 13:03:47,799 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-11-22 13:03:47,799 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-11-22 13:03:47,801 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-11-22 13:03:47,801 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-11-22 13:03:47,801 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-11-22 13:03:47,802 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-11-22 13:03:47,802 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-11-22 13:03:47,802 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-11-22 13:03:47,803 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2020-11-22 13:03:47,803 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-11-22 13:03:47,803 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-11-22 13:03:47,803 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-11-22 13:03:47,803 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2020-11-22 13:03:47,804 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES 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_3f7de178-6e40-43f3-bb2b-990672eded76/bin/utaipan/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud-vcloud-master/worker/run_dir_3f7de178-6e40-43f3-bb2b-990672eded76/bin/utaipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 063966206f80cef10873a8e49ae0985aad7f65cb [2020-11-22 13:03:48,056 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-11-22 13:03:48,091 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-11-22 13:03:48,093 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-11-22 13:03:48,094 INFO L271 PluginConnector]: Initializing CDTParser... [2020-11-22 13:03:48,095 INFO L275 PluginConnector]: CDTParser initialized [2020-11-22 13:03:48,096 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/run_dir_3f7de178-6e40-43f3-bb2b-990672eded76/bin/utaipan/../../sv-benchmarks/c/recursive-simple/fibo_5-2.c [2020-11-22 13:03:48,176 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_3f7de178-6e40-43f3-bb2b-990672eded76/bin/utaipan/data/9ffc7241b/96f5f36b8a244098981c255f34391c9e/FLAGd086b147e [2020-11-22 13:03:48,672 INFO L306 CDTParser]: Found 1 translation units. [2020-11-22 13:03:48,673 INFO L160 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/run_dir_3f7de178-6e40-43f3-bb2b-990672eded76/sv-benchmarks/c/recursive-simple/fibo_5-2.c [2020-11-22 13:03:48,683 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_3f7de178-6e40-43f3-bb2b-990672eded76/bin/utaipan/data/9ffc7241b/96f5f36b8a244098981c255f34391c9e/FLAGd086b147e [2020-11-22 13:03:48,998 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/run_dir_3f7de178-6e40-43f3-bb2b-990672eded76/bin/utaipan/data/9ffc7241b/96f5f36b8a244098981c255f34391c9e [2020-11-22 13:03:49,000 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-11-22 13:03:49,002 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2020-11-22 13:03:49,003 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-11-22 13:03:49,004 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-11-22 13:03:49,010 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-11-22 13:03:49,011 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.11 01:03:48" (1/1) ... [2020-11-22 13:03:49,018 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3f896b84 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:03:49, skipping insertion in model container [2020-11-22 13:03:49,019 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.11 01:03:48" (1/1) ... [2020-11-22 13:03:49,026 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-11-22 13:03:49,041 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-11-22 13:03:49,211 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-11-22 13:03:49,220 INFO L203 MainTranslator]: Completed pre-run [2020-11-22 13:03:49,234 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-11-22 13:03:49,248 INFO L208 MainTranslator]: Completed translation [2020-11-22 13:03:49,249 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:03:49 WrapperNode [2020-11-22 13:03:49,249 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-11-22 13:03:49,251 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2020-11-22 13:03:49,251 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2020-11-22 13:03:49,251 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2020-11-22 13:03:49,259 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:03:49" (1/1) ... [2020-11-22 13:03:49,266 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:03:49" (1/1) ... [2020-11-22 13:03:49,281 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2020-11-22 13:03:49,282 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-11-22 13:03:49,282 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-11-22 13:03:49,282 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-11-22 13:03:49,290 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:03:49" (1/1) ... [2020-11-22 13:03:49,291 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:03:49" (1/1) ... [2020-11-22 13:03:49,292 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:03:49" (1/1) ... [2020-11-22 13:03:49,292 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:03:49" (1/1) ... [2020-11-22 13:03:49,295 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:03:49" (1/1) ... [2020-11-22 13:03:49,297 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:03:49" (1/1) ... [2020-11-22 13:03:49,298 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:03:49" (1/1) ... [2020-11-22 13:03:49,300 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-11-22 13:03:49,301 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-11-22 13:03:49,301 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-11-22 13:03:49,301 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-11-22 13:03:49,302 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:03:49" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_3f7de178-6e40-43f3-bb2b-990672eded76/bin/utaipan/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 [2020-11-22 13:03:49,373 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-11-22 13:03:49,374 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-11-22 13:03:49,374 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-11-22 13:03:49,374 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-11-22 13:03:49,374 INFO L130 BoogieDeclarations]: Found specification of procedure fibo [2020-11-22 13:03:49,375 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo [2020-11-22 13:03:49,741 INFO L293 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-11-22 13:03:49,741 INFO L298 CfgBuilder]: Removed 6 assume(true) statements. [2020-11-22 13:03:49,743 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.11 01:03:49 BoogieIcfgContainer [2020-11-22 13:03:49,744 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-11-22 13:03:49,746 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-11-22 13:03:49,746 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-11-22 13:03:49,751 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-11-22 13:03:49,751 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.11 01:03:48" (1/3) ... [2020-11-22 13:03:49,752 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6e3d2053 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.11 01:03:49, skipping insertion in model container [2020-11-22 13:03:49,752 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:03:49" (2/3) ... [2020-11-22 13:03:49,753 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6e3d2053 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.11 01:03:49, skipping insertion in model container [2020-11-22 13:03:49,753 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.11 01:03:49" (3/3) ... [2020-11-22 13:03:49,756 INFO L111 eAbstractionObserver]: Analyzing ICFG fibo_5-2.c [2020-11-22 13:03:49,770 INFO L164 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-11-22 13:03:49,774 INFO L176 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-11-22 13:03:49,786 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-11-22 13:03:49,821 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-11-22 13:03:49,821 INFO L378 AbstractCegarLoop]: Hoare is true [2020-11-22 13:03:49,821 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-11-22 13:03:49,821 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-11-22 13:03:49,822 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-11-22 13:03:49,822 INFO L382 AbstractCegarLoop]: Difference is false [2020-11-22 13:03:49,822 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-11-22 13:03:49,822 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-11-22 13:03:49,842 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states. [2020-11-22 13:03:49,847 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2020-11-22 13:03:49,847 INFO L414 BasicCegarLoop]: Found error trace [2020-11-22 13:03:49,848 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-22 13:03:49,848 INFO L429 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-22 13:03:49,854 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-22 13:03:49,854 INFO L82 PathProgramCache]: Analyzing trace with hash 905959110, now seen corresponding path program 1 times [2020-11-22 13:03:49,864 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-22 13:03:49,865 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2074941090] [2020-11-22 13:03:49,865 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-22 13:03:49,981 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-22 13:03:50,094 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-22 13:03:50,095 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2074941090] [2020-11-22 13:03:50,096 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-22 13:03:50,096 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-11-22 13:03:50,097 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [914592811] [2020-11-22 13:03:50,102 INFO L461 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-11-22 13:03:50,104 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-22 13:03:50,118 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-11-22 13:03:50,118 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-11-22 13:03:50,120 INFO L87 Difference]: Start difference. First operand 17 states. Second operand 5 states. [2020-11-22 13:03:50,200 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-22 13:03:50,200 INFO L93 Difference]: Finished difference Result 27 states and 32 transitions. [2020-11-22 13:03:50,202 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-11-22 13:03:50,203 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 9 [2020-11-22 13:03:50,203 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-22 13:03:50,211 INFO L225 Difference]: With dead ends: 27 [2020-11-22 13:03:50,211 INFO L226 Difference]: Without dead ends: 17 [2020-11-22 13:03:50,220 INFO L677 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 [2020-11-22 13:03:50,237 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2020-11-22 13:03:50,263 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2020-11-22 13:03:50,264 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-11-22 13:03:50,267 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 21 transitions. [2020-11-22 13:03:50,269 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 21 transitions. Word has length 9 [2020-11-22 13:03:50,270 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-22 13:03:50,270 INFO L481 AbstractCegarLoop]: Abstraction has 17 states and 21 transitions. [2020-11-22 13:03:50,270 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-11-22 13:03:50,270 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 21 transitions. [2020-11-22 13:03:50,272 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-11-22 13:03:50,273 INFO L414 BasicCegarLoop]: Found error trace [2020-11-22 13:03:50,273 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-22 13:03:50,273 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-11-22 13:03:50,275 INFO L429 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-22 13:03:50,278 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-22 13:03:50,278 INFO L82 PathProgramCache]: Analyzing trace with hash -1265236344, now seen corresponding path program 1 times [2020-11-22 13:03:50,278 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-22 13:03:50,279 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1071505523] [2020-11-22 13:03:50,279 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-22 13:03:50,303 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-22 13:03:50,351 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-22 13:03:50,351 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1071505523] [2020-11-22 13:03:50,352 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-22 13:03:50,352 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-11-22 13:03:50,352 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [861571375] [2020-11-22 13:03:50,353 INFO L461 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-11-22 13:03:50,354 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-22 13:03:50,354 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-11-22 13:03:50,354 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-11-22 13:03:50,355 INFO L87 Difference]: Start difference. First operand 17 states and 21 transitions. Second operand 5 states. [2020-11-22 13:03:50,382 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-22 13:03:50,383 INFO L93 Difference]: Finished difference Result 23 states and 28 transitions. [2020-11-22 13:03:50,383 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-11-22 13:03:50,383 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 10 [2020-11-22 13:03:50,384 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-22 13:03:50,384 INFO L225 Difference]: With dead ends: 23 [2020-11-22 13:03:50,385 INFO L226 Difference]: Without dead ends: 19 [2020-11-22 13:03:50,385 INFO L677 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 [2020-11-22 13:03:50,386 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2020-11-22 13:03:50,390 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 17. [2020-11-22 13:03:50,391 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-11-22 13:03:50,392 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 21 transitions. [2020-11-22 13:03:50,392 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 21 transitions. Word has length 10 [2020-11-22 13:03:50,392 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-22 13:03:50,392 INFO L481 AbstractCegarLoop]: Abstraction has 17 states and 21 transitions. [2020-11-22 13:03:50,393 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-11-22 13:03:50,393 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 21 transitions. [2020-11-22 13:03:50,394 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-11-22 13:03:50,394 INFO L414 BasicCegarLoop]: Found error trace [2020-11-22 13:03:50,394 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-22 13:03:50,394 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-11-22 13:03:50,395 INFO L429 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-22 13:03:50,395 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-22 13:03:50,395 INFO L82 PathProgramCache]: Analyzing trace with hash -1866684669, now seen corresponding path program 1 times [2020-11-22 13:03:50,396 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-22 13:03:50,396 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1363415853] [2020-11-22 13:03:50,396 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-22 13:03:50,414 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-22 13:03:50,507 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 5 proven. 3 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-11-22 13:03:50,507 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1363415853] [2020-11-22 13:03:50,507 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [452743274] [2020-11-22 13:03:50,508 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_3f7de178-6e40-43f3-bb2b-990672eded76/bin/utaipan/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 [2020-11-22 13:03:50,556 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-22 13:03:50,558 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 6 conjunts are in the unsatisfiable core [2020-11-22 13:03:50,564 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-22 13:03:50,686 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-11-22 13:03:50,687 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-11-22 13:03:50,959 INFO L603 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-11-22 13:03:51,009 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 7 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-11-22 13:03:51,010 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [206188445] [2020-11-22 13:03:51,053 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2020-11-22 13:03:51,067 INFO L166 IcfgInterpreter]: Building call graph [2020-11-22 13:03:51,073 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:289) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:189) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:179) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:84) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:74) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:511) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterateInternal(AbstractCegarLoop.java:438) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:372) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopResult.iterate(CegarLoopResult.java:142) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.iterateNew(TraceAbstractionStarter.java:341) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:182) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:134) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2020-11-22 13:03:51,074 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-11-22 13:03:51,075 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 7] total 11 [2020-11-22 13:03:51,075 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [164843558] [2020-11-22 13:03:51,076 INFO L461 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-11-22 13:03:51,076 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-22 13:03:51,077 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-11-22 13:03:51,077 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=80, Unknown=0, NotChecked=0, Total=110 [2020-11-22 13:03:51,077 INFO L87 Difference]: Start difference. First operand 17 states and 21 transitions. Second operand 11 states. [2020-11-22 13:03:51,252 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-22 13:03:51,252 INFO L93 Difference]: Finished difference Result 34 states and 45 transitions. [2020-11-22 13:03:51,253 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-11-22 13:03:51,253 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 22 [2020-11-22 13:03:51,253 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-22 13:03:51,254 INFO L225 Difference]: With dead ends: 34 [2020-11-22 13:03:51,254 INFO L226 Difference]: Without dead ends: 19 [2020-11-22 13:03:51,255 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 36 SyntacticMatches, 5 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=59, Invalid=151, Unknown=0, NotChecked=0, Total=210 [2020-11-22 13:03:51,255 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2020-11-22 13:03:51,259 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2020-11-22 13:03:51,260 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2020-11-22 13:03:51,264 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 23 transitions. [2020-11-22 13:03:51,265 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 23 transitions. Word has length 22 [2020-11-22 13:03:51,266 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-22 13:03:51,266 INFO L481 AbstractCegarLoop]: Abstraction has 19 states and 23 transitions. [2020-11-22 13:03:51,266 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-11-22 13:03:51,266 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 23 transitions. [2020-11-22 13:03:51,271 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-11-22 13:03:51,271 INFO L414 BasicCegarLoop]: Found error trace [2020-11-22 13:03:51,271 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-22 13:03:51,488 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2020-11-22 13:03:51,489 INFO L429 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-22 13:03:51,489 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-22 13:03:51,489 INFO L82 PathProgramCache]: Analyzing trace with hash -542903319, now seen corresponding path program 1 times [2020-11-22 13:03:51,489 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-22 13:03:51,490 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1253331878] [2020-11-22 13:03:51,490 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-22 13:03:51,511 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-22 13:03:51,599 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-11-22 13:03:51,600 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1253331878] [2020-11-22 13:03:51,600 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1260466465] [2020-11-22 13:03:51,600 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_3f7de178-6e40-43f3-bb2b-990672eded76/bin/utaipan/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 [2020-11-22 13:03:51,639 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-22 13:03:51,641 INFO L263 TraceCheckSpWp]: Trace formula consists of 83 conjuncts, 6 conjunts are in the unsatisfiable core [2020-11-22 13:03:51,643 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-22 13:03:51,678 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-11-22 13:03:51,679 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-11-22 13:03:51,851 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 8 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-11-22 13:03:51,851 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [47824339] [2020-11-22 13:03:51,854 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2020-11-22 13:03:51,854 INFO L166 IcfgInterpreter]: Building call graph [2020-11-22 13:03:51,855 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:289) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:189) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:179) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:84) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:74) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:511) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterateInternal(AbstractCegarLoop.java:438) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:372) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopResult.iterate(CegarLoopResult.java:142) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.iterateNew(TraceAbstractionStarter.java:341) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:182) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:134) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2020-11-22 13:03:51,855 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-11-22 13:03:51,855 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 7] total 9 [2020-11-22 13:03:51,855 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1826618545] [2020-11-22 13:03:51,856 INFO L461 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-11-22 13:03:51,856 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-22 13:03:51,856 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-11-22 13:03:51,857 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-11-22 13:03:51,857 INFO L87 Difference]: Start difference. First operand 19 states and 23 transitions. Second operand 9 states. [2020-11-22 13:03:51,961 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-22 13:03:51,961 INFO L93 Difference]: Finished difference Result 28 states and 37 transitions. [2020-11-22 13:03:51,962 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-11-22 13:03:51,962 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 23 [2020-11-22 13:03:51,963 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-22 13:03:51,964 INFO L225 Difference]: With dead ends: 28 [2020-11-22 13:03:51,964 INFO L226 Difference]: Without dead ends: 24 [2020-11-22 13:03:51,965 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 43 SyntacticMatches, 3 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=36, Invalid=74, Unknown=0, NotChecked=0, Total=110 [2020-11-22 13:03:51,965 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-11-22 13:03:51,975 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2020-11-22 13:03:51,977 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-11-22 13:03:51,979 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 33 transitions. [2020-11-22 13:03:51,980 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 33 transitions. Word has length 23 [2020-11-22 13:03:51,981 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-22 13:03:51,981 INFO L481 AbstractCegarLoop]: Abstraction has 24 states and 33 transitions. [2020-11-22 13:03:51,981 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-11-22 13:03:51,981 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 33 transitions. [2020-11-22 13:03:51,985 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-11-22 13:03:51,985 INFO L414 BasicCegarLoop]: Found error trace [2020-11-22 13:03:51,986 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2020-11-22 13:03:52,199 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-22 13:03:52,200 INFO L429 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-22 13:03:52,200 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-22 13:03:52,200 INFO L82 PathProgramCache]: Analyzing trace with hash 22641728, now seen corresponding path program 2 times [2020-11-22 13:03:52,200 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-22 13:03:52,201 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [896825919] [2020-11-22 13:03:52,201 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-22 13:03:52,225 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-22 13:03:52,359 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 23 proven. 8 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2020-11-22 13:03:52,359 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [896825919] [2020-11-22 13:03:52,360 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2137985392] [2020-11-22 13:03:52,360 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_3f7de178-6e40-43f3-bb2b-990672eded76/bin/utaipan/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-22 13:03:52,409 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2020-11-22 13:03:52,409 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-11-22 13:03:52,410 INFO L263 TraceCheckSpWp]: Trace formula consists of 73 conjuncts, 6 conjunts are in the unsatisfiable core [2020-11-22 13:03:52,413 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-22 13:03:52,482 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 18 proven. 8 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-11-22 13:03:52,482 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-11-22 13:03:52,778 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 18 proven. 9 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2020-11-22 13:03:52,778 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [885935888] [2020-11-22 13:03:52,781 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2020-11-22 13:03:52,781 INFO L166 IcfgInterpreter]: Building call graph [2020-11-22 13:03:52,781 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:289) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:189) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:179) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:84) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:74) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:511) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterateInternal(AbstractCegarLoop.java:438) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:372) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopResult.iterate(CegarLoopResult.java:142) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.iterateNew(TraceAbstractionStarter.java:341) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:182) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:134) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2020-11-22 13:03:52,782 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-11-22 13:03:52,782 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 6, 7] total 13 [2020-11-22 13:03:52,782 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1449756919] [2020-11-22 13:03:52,783 INFO L461 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-11-22 13:03:52,783 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-22 13:03:52,783 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-11-22 13:03:52,784 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=122, Unknown=0, NotChecked=0, Total=156 [2020-11-22 13:03:52,784 INFO L87 Difference]: Start difference. First operand 24 states and 33 transitions. Second operand 13 states. [2020-11-22 13:03:53,157 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-22 13:03:53,158 INFO L93 Difference]: Finished difference Result 55 states and 85 transitions. [2020-11-22 13:03:53,160 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-11-22 13:03:53,161 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 36 [2020-11-22 13:03:53,161 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-22 13:03:53,163 INFO L225 Difference]: With dead ends: 55 [2020-11-22 13:03:53,163 INFO L226 Difference]: Without dead ends: 33 [2020-11-22 13:03:53,164 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 62 SyntacticMatches, 5 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=102, Invalid=278, Unknown=0, NotChecked=0, Total=380 [2020-11-22 13:03:53,164 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-11-22 13:03:53,175 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 27. [2020-11-22 13:03:53,175 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-11-22 13:03:53,176 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 35 transitions. [2020-11-22 13:03:53,176 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 35 transitions. Word has length 36 [2020-11-22 13:03:53,177 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-22 13:03:53,177 INFO L481 AbstractCegarLoop]: Abstraction has 27 states and 35 transitions. [2020-11-22 13:03:53,177 INFO L482 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-11-22 13:03:53,177 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 35 transitions. [2020-11-22 13:03:53,178 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-11-22 13:03:53,179 INFO L414 BasicCegarLoop]: Found error trace [2020-11-22 13:03:53,179 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2020-11-22 13:03:53,379 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-22 13:03:53,380 INFO L429 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-22 13:03:53,380 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-22 13:03:53,380 INFO L82 PathProgramCache]: Analyzing trace with hash -1513719602, now seen corresponding path program 3 times [2020-11-22 13:03:53,380 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-22 13:03:53,380 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1518845459] [2020-11-22 13:03:53,380 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-22 13:03:53,399 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-22 13:03:53,491 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 6 proven. 24 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2020-11-22 13:03:53,491 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1518845459] [2020-11-22 13:03:53,492 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [729549011] [2020-11-22 13:03:53,492 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_3f7de178-6e40-43f3-bb2b-990672eded76/bin/utaipan/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-22 13:03:53,547 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-11-22 13:03:53,548 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-11-22 13:03:53,548 INFO L263 TraceCheckSpWp]: Trace formula consists of 114 conjuncts, 8 conjunts are in the unsatisfiable core [2020-11-22 13:03:53,552 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-22 13:03:53,583 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 6 proven. 24 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2020-11-22 13:03:53,583 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-11-22 13:03:53,955 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 6 proven. 31 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2020-11-22 13:03:53,955 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [75230798] [2020-11-22 13:03:53,958 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2020-11-22 13:03:53,958 INFO L166 IcfgInterpreter]: Building call graph [2020-11-22 13:03:53,958 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:289) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:189) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:179) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:84) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:74) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:511) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterateInternal(AbstractCegarLoop.java:438) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:372) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopResult.iterate(CegarLoopResult.java:142) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.iterateNew(TraceAbstractionStarter.java:341) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:182) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:134) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2020-11-22 13:03:53,958 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-11-22 13:03:53,959 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 9] total 11 [2020-11-22 13:03:53,959 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [978723137] [2020-11-22 13:03:53,959 INFO L461 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-11-22 13:03:53,960 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-22 13:03:53,960 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-11-22 13:03:53,960 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2020-11-22 13:03:53,960 INFO L87 Difference]: Start difference. First operand 27 states and 35 transitions. Second operand 11 states. [2020-11-22 13:03:54,134 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-22 13:03:54,134 INFO L93 Difference]: Finished difference Result 36 states and 50 transitions. [2020-11-22 13:03:54,135 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-11-22 13:03:54,135 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 37 [2020-11-22 13:03:54,136 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-22 13:03:54,137 INFO L225 Difference]: With dead ends: 36 [2020-11-22 13:03:54,137 INFO L226 Difference]: Without dead ends: 32 [2020-11-22 13:03:54,138 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 70 SyntacticMatches, 4 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=59, Invalid=123, Unknown=0, NotChecked=0, Total=182 [2020-11-22 13:03:54,138 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-11-22 13:03:54,149 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2020-11-22 13:03:54,149 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-11-22 13:03:54,152 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 46 transitions. [2020-11-22 13:03:54,153 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 46 transitions. Word has length 37 [2020-11-22 13:03:54,157 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-22 13:03:54,157 INFO L481 AbstractCegarLoop]: Abstraction has 32 states and 46 transitions. [2020-11-22 13:03:54,157 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-11-22 13:03:54,157 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 46 transitions. [2020-11-22 13:03:54,162 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2020-11-22 13:03:54,167 INFO L414 BasicCegarLoop]: Found error trace [2020-11-22 13:03:54,168 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 11, 6, 6, 6, 6, 6, 6, 6, 5, 2, 1, 1, 1, 1, 1, 1] [2020-11-22 13:03:54,368 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-22 13:03:54,368 INFO L429 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-22 13:03:54,369 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-22 13:03:54,369 INFO L82 PathProgramCache]: Analyzing trace with hash -2041907346, now seen corresponding path program 4 times [2020-11-22 13:03:54,369 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-22 13:03:54,369 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1609939419] [2020-11-22 13:03:54,369 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-22 13:03:54,401 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-22 13:03:54,492 INFO L134 CoverageAnalysis]: Checked inductivity of 427 backedges. 27 proven. 166 refuted. 0 times theorem prover too weak. 234 trivial. 0 not checked. [2020-11-22 13:03:54,492 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1609939419] [2020-11-22 13:03:54,493 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1335480121] [2020-11-22 13:03:54,493 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_3f7de178-6e40-43f3-bb2b-990672eded76/bin/utaipan/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-22 13:03:54,573 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-22 13:03:54,574 INFO L263 TraceCheckSpWp]: Trace formula consists of 236 conjuncts, 10 conjunts are in the unsatisfiable core [2020-11-22 13:03:54,603 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-22 13:03:54,658 INFO L134 CoverageAnalysis]: Checked inductivity of 427 backedges. 27 proven. 166 refuted. 0 times theorem prover too weak. 234 trivial. 0 not checked. [2020-11-22 13:03:54,659 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-11-22 13:03:55,417 INFO L134 CoverageAnalysis]: Checked inductivity of 427 backedges. 27 proven. 181 refuted. 0 times theorem prover too weak. 219 trivial. 0 not checked. [2020-11-22 13:03:55,417 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1278823262] [2020-11-22 13:03:55,420 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2020-11-22 13:03:55,420 INFO L166 IcfgInterpreter]: Building call graph [2020-11-22 13:03:55,420 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:289) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:189) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:179) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:84) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:74) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:511) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterateInternal(AbstractCegarLoop.java:438) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:372) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopResult.iterate(CegarLoopResult.java:142) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.iterateNew(TraceAbstractionStarter.java:341) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:182) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:134) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2020-11-22 13:03:55,421 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-11-22 13:03:55,421 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 11] total 12 [2020-11-22 13:03:55,421 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [873086782] [2020-11-22 13:03:55,422 INFO L461 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-11-22 13:03:55,422 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-22 13:03:55,423 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-11-22 13:03:55,423 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=91, Unknown=0, NotChecked=0, Total=132 [2020-11-22 13:03:55,423 INFO L87 Difference]: Start difference. First operand 32 states and 46 transitions. Second operand 12 states. [2020-11-22 13:03:55,612 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-22 13:03:55,612 INFO L93 Difference]: Finished difference Result 41 states and 63 transitions. [2020-11-22 13:03:55,612 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-11-22 13:03:55,613 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 92 [2020-11-22 13:03:55,613 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-22 13:03:55,615 INFO L225 Difference]: With dead ends: 41 [2020-11-22 13:03:55,615 INFO L226 Difference]: Without dead ends: 37 [2020-11-22 13:03:55,616 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 197 GetRequests, 176 SyntacticMatches, 7 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=85, Invalid=155, Unknown=0, NotChecked=0, Total=240 [2020-11-22 13:03:55,622 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-11-22 13:03:55,630 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2020-11-22 13:03:55,630 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-11-22 13:03:55,631 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 59 transitions. [2020-11-22 13:03:55,631 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 59 transitions. Word has length 92 [2020-11-22 13:03:55,632 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-22 13:03:55,635 INFO L481 AbstractCegarLoop]: Abstraction has 37 states and 59 transitions. [2020-11-22 13:03:55,635 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-11-22 13:03:55,635 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 59 transitions. [2020-11-22 13:03:55,644 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2020-11-22 13:03:55,644 INFO L414 BasicCegarLoop]: Found error trace [2020-11-22 13:03:55,644 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 12, 7, 7, 7, 7, 7, 7, 7, 5, 3, 1, 1, 1, 1, 1, 1] [2020-11-22 13:03:55,880 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2020-11-22 13:03:55,880 INFO L429 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-22 13:03:55,881 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-22 13:03:55,881 INFO L82 PathProgramCache]: Analyzing trace with hash -1860320207, now seen corresponding path program 5 times [2020-11-22 13:03:55,881 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-22 13:03:55,881 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [362417831] [2020-11-22 13:03:55,881 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-22 13:03:55,949 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-22 13:03:55,949 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-22 13:03:55,995 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-22 13:03:55,996 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-22 13:03:56,037 INFO L173 FreeRefinementEngine]: Strategy SIFA_TAIPAN found a feasible trace [2020-11-22 13:03:56,038 INFO L523 BasicCegarLoop]: Counterexample might be feasible [2020-11-22 13:03:56,038 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-11-22 13:03:56,135 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 22.11 01:03:56 BoogieIcfgContainer [2020-11-22 13:03:56,139 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-11-22 13:03:56,140 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2020-11-22 13:03:56,140 INFO L271 PluginConnector]: Initializing Witness Printer... [2020-11-22 13:03:56,140 INFO L275 PluginConnector]: Witness Printer initialized [2020-11-22 13:03:56,140 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.11 01:03:49" (3/4) ... [2020-11-22 13:03:56,148 INFO L131 WitnessPrinter]: Generating witness for reachability counterexample [2020-11-22 13:03:56,245 INFO L141 WitnessManager]: Wrote witness to /tmp/vcloud-vcloud-master/worker/run_dir_3f7de178-6e40-43f3-bb2b-990672eded76/bin/utaipan/witness.graphml [2020-11-22 13:03:56,245 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2020-11-22 13:03:56,247 INFO L168 Benchmark]: Toolchain (without parser) took 7244.14 ms. Allocated memory was 130.0 MB in the beginning and 199.2 MB in the end (delta: 69.2 MB). Free memory was 106.8 MB in the beginning and 102.3 MB in the end (delta: 4.6 MB). Peak memory consumption was 73.5 MB. Max. memory is 16.1 GB. [2020-11-22 13:03:56,247 INFO L168 Benchmark]: CDTParser took 0.21 ms. Allocated memory is still 90.2 MB. Free memory is still 53.6 MB. There was no memory consumed. Max. memory is 16.1 GB. [2020-11-22 13:03:56,250 INFO L168 Benchmark]: CACSL2BoogieTranslator took 246.38 ms. Allocated memory is still 130.0 MB. Free memory was 106.8 MB in the beginning and 106.3 MB in the end (delta: 560.0 kB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. [2020-11-22 13:03:56,250 INFO L168 Benchmark]: Boogie Procedure Inliner took 30.82 ms. Allocated memory is still 130.0 MB. Free memory was 106.3 MB in the beginning and 105.1 MB in the end (delta: 1.2 MB). There was no memory consumed. Max. memory is 16.1 GB. [2020-11-22 13:03:56,251 INFO L168 Benchmark]: Boogie Preprocessor took 18.18 ms. Allocated memory is still 130.0 MB. Free memory was 105.1 MB in the beginning and 104.2 MB in the end (delta: 916.7 kB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2020-11-22 13:03:56,251 INFO L168 Benchmark]: RCFGBuilder took 442.95 ms. Allocated memory is still 130.0 MB. Free memory was 104.2 MB in the beginning and 91.1 MB in the end (delta: 13.0 MB). Peak memory consumption was 12.6 MB. Max. memory is 16.1 GB. [2020-11-22 13:03:56,252 INFO L168 Benchmark]: TraceAbstraction took 6393.36 ms. Allocated memory was 130.0 MB in the beginning and 199.2 MB in the end (delta: 69.2 MB). Free memory was 90.7 MB in the beginning and 108.6 MB in the end (delta: -17.9 MB). Peak memory consumption was 54.2 MB. Max. memory is 16.1 GB. [2020-11-22 13:03:56,252 INFO L168 Benchmark]: Witness Printer took 105.91 ms. Allocated memory is still 199.2 MB. Free memory was 108.6 MB in the beginning and 102.3 MB in the end (delta: 6.3 MB). Peak memory consumption was 6.3 MB. Max. memory is 16.1 GB. [2020-11-22 13:03:56,254 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.21 ms. Allocated memory is still 90.2 MB. Free memory is still 53.6 MB. There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 246.38 ms. Allocated memory is still 130.0 MB. Free memory was 106.8 MB in the beginning and 106.3 MB in the end (delta: 560.0 kB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. * Boogie Procedure Inliner took 30.82 ms. Allocated memory is still 130.0 MB. Free memory was 106.3 MB in the beginning and 105.1 MB in the end (delta: 1.2 MB). There was no memory consumed. Max. memory is 16.1 GB. * Boogie Preprocessor took 18.18 ms. Allocated memory is still 130.0 MB. Free memory was 105.1 MB in the beginning and 104.2 MB in the end (delta: 916.7 kB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * RCFGBuilder took 442.95 ms. Allocated memory is still 130.0 MB. Free memory was 104.2 MB in the beginning and 91.1 MB in the end (delta: 13.0 MB). Peak memory consumption was 12.6 MB. Max. memory is 16.1 GB. * TraceAbstraction took 6393.36 ms. Allocated memory was 130.0 MB in the beginning and 199.2 MB in the end (delta: 69.2 MB). Free memory was 90.7 MB in the beginning and 108.6 MB in the end (delta: -17.9 MB). Peak memory consumption was 54.2 MB. Max. memory is 16.1 GB. * Witness Printer took 105.91 ms. Allocated memory is still 199.2 MB. Free memory was 108.6 MB in the beginning and 102.3 MB in the end (delta: 6.3 MB). Peak memory consumption was 6.3 MB. Max. memory is 16.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 4]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L26] int x = 5; [L27] CALL, EXPR fibo(x) VAL [\old(n)=5] [L8] COND FALSE !(n < 1) VAL [\old(n)=5, n=5] [L10] COND FALSE !(n == 1) VAL [\old(n)=5, n=5] [L13] CALL, EXPR fibo(n-1) VAL [\old(n)=4] [L8] COND FALSE !(n < 1) VAL [\old(n)=4, n=4] [L10] COND FALSE !(n == 1) VAL [\old(n)=4, n=4] [L13] CALL, EXPR fibo(n-1) VAL [\old(n)=3] [L8] COND FALSE !(n < 1) VAL [\old(n)=3, n=3] [L10] COND FALSE !(n == 1) VAL [\old(n)=3, n=3] [L13] CALL, EXPR fibo(n-1) VAL [\old(n)=2] [L8] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L10] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L13] CALL, EXPR fibo(n-1) VAL [\old(n)=1] [L8] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L10] COND TRUE n == 1 [L11] return 1; VAL [\old(n)=1, \result=1, n=1] [L13] RET, EXPR fibo(n-1) VAL [\old(n)=2, fibo(n-1)=1, n=2] [L13] CALL, EXPR fibo(n-2) VAL [\old(n)=0] [L8] COND TRUE n < 1 [L9] return 0; VAL [\old(n)=0, \result=0, n=0] [L13] RET, EXPR fibo(n-2) VAL [\old(n)=2, fibo(n-1)=1, fibo(n-2)=0, n=2] [L13] return fibo(n-1) + fibo(n-2); [L13] RET, EXPR fibo(n-1) VAL [\old(n)=3, fibo(n-1)=1, n=3] [L13] CALL, EXPR fibo(n-2) VAL [\old(n)=1] [L8] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L10] COND TRUE n == 1 [L11] return 1; VAL [\old(n)=1, \result=1, n=1] [L13] RET, EXPR fibo(n-2) VAL [\old(n)=3, fibo(n-1)=1, fibo(n-2)=1, n=3] [L13] return fibo(n-1) + fibo(n-2); [L13] RET, EXPR fibo(n-1) VAL [\old(n)=4, fibo(n-1)=2, n=4] [L13] CALL, EXPR fibo(n-2) VAL [\old(n)=2] [L8] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L10] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L13] CALL, EXPR fibo(n-1) VAL [\old(n)=1] [L8] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L10] COND TRUE n == 1 [L11] return 1; VAL [\old(n)=1, \result=1, n=1] [L13] RET, EXPR fibo(n-1) VAL [\old(n)=2, fibo(n-1)=1, n=2] [L13] CALL, EXPR fibo(n-2) VAL [\old(n)=0] [L8] COND TRUE n < 1 [L9] return 0; VAL [\old(n)=0, \result=0, n=0] [L13] RET, EXPR fibo(n-2) VAL [\old(n)=2, fibo(n-1)=1, fibo(n-2)=0, n=2] [L13] return fibo(n-1) + fibo(n-2); [L13] RET, EXPR fibo(n-2) VAL [\old(n)=4, fibo(n-1)=2, fibo(n-2)=1, n=4] [L13] return fibo(n-1) + fibo(n-2); [L13] RET, EXPR fibo(n-1) VAL [\old(n)=5, fibo(n-1)=3, n=5] [L13] CALL, EXPR fibo(n-2) VAL [\old(n)=3] [L8] COND FALSE !(n < 1) VAL [\old(n)=3, n=3] [L10] COND FALSE !(n == 1) VAL [\old(n)=3, n=3] [L13] CALL, EXPR fibo(n-1) VAL [\old(n)=2] [L8] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L10] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L13] CALL, EXPR fibo(n-1) VAL [\old(n)=1] [L8] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L10] COND TRUE n == 1 [L11] return 1; VAL [\old(n)=1, \result=1, n=1] [L13] RET, EXPR fibo(n-1) VAL [\old(n)=2, fibo(n-1)=1, n=2] [L13] CALL, EXPR fibo(n-2) VAL [\old(n)=0] [L8] COND TRUE n < 1 [L9] return 0; VAL [\old(n)=0, \result=0, n=0] [L13] RET, EXPR fibo(n-2) VAL [\old(n)=2, fibo(n-1)=1, fibo(n-2)=0, n=2] [L13] return fibo(n-1) + fibo(n-2); [L13] RET, EXPR fibo(n-1) VAL [\old(n)=3, fibo(n-1)=1, n=3] [L13] CALL, EXPR fibo(n-2) VAL [\old(n)=1] [L8] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L10] COND TRUE n == 1 [L11] return 1; VAL [\old(n)=1, \result=1, n=1] [L13] RET, EXPR fibo(n-2) VAL [\old(n)=3, fibo(n-1)=1, fibo(n-2)=1, n=3] [L13] return fibo(n-1) + fibo(n-2); [L13] RET, EXPR fibo(n-2) VAL [\old(n)=5, fibo(n-1)=3, fibo(n-2)=2, n=5] [L13] return fibo(n-1) + fibo(n-2); [L27] RET, EXPR fibo(x) [L27] int result = fibo(x); [L28] COND TRUE result == 5 [L4] __assert_fail("0", "fibo_5-2.c", 4, "reach_error") - StatisticsResult: Ultimate Automizer benchmark data CFG has 2 procedures, 17 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 6.2s, OverallIterations: 8, TraceHistogramMax: 15, AutomataDifference: 1.1s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 100 SDtfs, 224 SDslu, 267 SDs, 0 SdLazy, 349 SolverSat, 217 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.5s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 487 GetRequests, 391 SyntacticMatches, 24 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 107 ImplicationChecksByTransitivity, 1.1s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=37occurred in iteration=7, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.1s AutomataMinimizationTime, 7 MinimizatonAttempts, 8 StatesRemovedByMinimization, 2 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.3s SatisfiabilityAnalysisTime, 2.9s InterpolantComputationTime, 544 NumberOfCodeBlocks, 526 NumberOfCodeBlocksAsserted, 15 NumberOfCheckSat, 632 ConstructedInterpolants, 0 QuantifiedInterpolants, 68548 SizeOfPredicates, 18 NumberOfNonLiveVariables, 587 ConjunctsInSsa, 36 ConjunctsInUnsatCore, 17 InterpolantComputations, 2 PerfectInterpolantSequences, 994/1647 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...