./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/recursive/Fibonacci01-1.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 7b2dab56 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud-vcloud-master/worker/run_dir_ab464e3b-480f-46de-8fae-115413e7ebbd/bin/utaipan/data/config -Xmx15G -Xms4m -jar /tmp/vcloud-vcloud-master/worker/run_dir_ab464e3b-480f-46de-8fae-115413e7ebbd/bin/utaipan/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/run_dir_ab464e3b-480f-46de-8fae-115413e7ebbd/bin/utaipan/data -tc /tmp/vcloud-vcloud-master/worker/run_dir_ab464e3b-480f-46de-8fae-115413e7ebbd/bin/utaipan/config/TaipanReach.xml -i ../../sv-benchmarks/c/recursive/Fibonacci01-1.c -s /tmp/vcloud-vcloud-master/worker/run_dir_ab464e3b-480f-46de-8fae-115413e7ebbd/bin/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/run_dir_ab464e3b-480f-46de-8fae-115413e7ebbd/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 a7a7e948458662610557b74203cf7c9c5c696340 ............................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................. Execution finished normally Writing output log to file Ultimate.log Result: TRUE --- Real Ultimate output --- This is Ultimate 0.2.0-7b2dab5 [2020-12-03 12:30:51,047 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-12-03 12:30:51,050 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-12-03 12:30:51,114 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-12-03 12:30:51,115 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-12-03 12:30:51,120 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-12-03 12:30:51,122 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-12-03 12:30:51,133 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-12-03 12:30:51,136 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-12-03 12:30:51,142 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-12-03 12:30:51,147 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-12-03 12:30:51,149 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-12-03 12:30:51,150 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-12-03 12:30:51,153 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-12-03 12:30:51,155 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-12-03 12:30:51,157 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-12-03 12:30:51,158 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-12-03 12:30:51,162 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-12-03 12:30:51,165 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-12-03 12:30:51,173 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-12-03 12:30:51,175 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-12-03 12:30:51,176 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-12-03 12:30:51,179 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-12-03 12:30:51,180 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-12-03 12:30:51,189 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-12-03 12:30:51,189 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-12-03 12:30:51,190 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-12-03 12:30:51,191 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-12-03 12:30:51,192 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-12-03 12:30:51,193 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-12-03 12:30:51,194 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-12-03 12:30:51,195 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-12-03 12:30:51,197 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-12-03 12:30:51,198 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-12-03 12:30:51,200 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-12-03 12:30:51,200 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-12-03 12:30:51,201 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-12-03 12:30:51,201 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-12-03 12:30:51,202 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-12-03 12:30:51,203 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-12-03 12:30:51,204 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-12-03 12:30:51,207 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud-vcloud-master/worker/run_dir_ab464e3b-480f-46de-8fae-115413e7ebbd/bin/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf [2020-12-03 12:30:51,237 INFO L113 SettingsManager]: Loading preferences was successful [2020-12-03 12:30:51,237 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-12-03 12:30:51,239 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2020-12-03 12:30:51,239 INFO L138 SettingsManager]: * User list type=DISABLED [2020-12-03 12:30:51,239 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2020-12-03 12:30:51,239 INFO L138 SettingsManager]: * Explicit value domain=true [2020-12-03 12:30:51,240 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2020-12-03 12:30:51,240 INFO L138 SettingsManager]: * Octagon Domain=false [2020-12-03 12:30:51,240 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2020-12-03 12:30:51,240 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2020-12-03 12:30:51,241 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2020-12-03 12:30:51,242 INFO L138 SettingsManager]: * Interval Domain=false [2020-12-03 12:30:51,242 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2020-12-03 12:30:51,242 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2020-12-03 12:30:51,242 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2020-12-03 12:30:51,243 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-12-03 12:30:51,243 INFO L138 SettingsManager]: * sizeof long=4 [2020-12-03 12:30:51,244 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-12-03 12:30:51,244 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-12-03 12:30:51,244 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-12-03 12:30:51,244 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-12-03 12:30:51,245 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-12-03 12:30:51,245 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-12-03 12:30:51,245 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2020-12-03 12:30:51,245 INFO L138 SettingsManager]: * sizeof long double=12 [2020-12-03 12:30:51,245 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-12-03 12:30:51,246 INFO L138 SettingsManager]: * Use constant arrays=true [2020-12-03 12:30:51,246 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-12-03 12:30:51,246 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-12-03 12:30:51,246 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-12-03 12:30:51,247 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-12-03 12:30:51,247 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-12-03 12:30:51,247 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-12-03 12:30:51,247 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-12-03 12:30:51,248 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2020-12-03 12:30:51,248 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-12-03 12:30:51,248 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-12-03 12:30:51,248 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-12-03 12:30:51,249 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2020-12-03 12:30:51,249 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_ab464e3b-480f-46de-8fae-115413e7ebbd/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud-vcloud-master/worker/run_dir_ab464e3b-480f-46de-8fae-115413e7ebbd/bin/utaipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> a7a7e948458662610557b74203cf7c9c5c696340 [2020-12-03 12:30:51,543 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-12-03 12:30:51,593 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-12-03 12:30:51,597 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-12-03 12:30:51,599 INFO L271 PluginConnector]: Initializing CDTParser... [2020-12-03 12:30:51,600 INFO L275 PluginConnector]: CDTParser initialized [2020-12-03 12:30:51,601 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/run_dir_ab464e3b-480f-46de-8fae-115413e7ebbd/bin/utaipan/../../sv-benchmarks/c/recursive/Fibonacci01-1.c [2020-12-03 12:30:51,680 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_ab464e3b-480f-46de-8fae-115413e7ebbd/bin/utaipan/data/9632d1c6a/6ca3a33330b045ff9c99cb83416cfca0/FLAGaed1a7d49 [2020-12-03 12:30:52,286 INFO L306 CDTParser]: Found 1 translation units. [2020-12-03 12:30:52,286 INFO L160 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/run_dir_ab464e3b-480f-46de-8fae-115413e7ebbd/sv-benchmarks/c/recursive/Fibonacci01-1.c [2020-12-03 12:30:52,303 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_ab464e3b-480f-46de-8fae-115413e7ebbd/bin/utaipan/data/9632d1c6a/6ca3a33330b045ff9c99cb83416cfca0/FLAGaed1a7d49 [2020-12-03 12:30:52,649 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/run_dir_ab464e3b-480f-46de-8fae-115413e7ebbd/bin/utaipan/data/9632d1c6a/6ca3a33330b045ff9c99cb83416cfca0 [2020-12-03 12:30:52,652 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-12-03 12:30:52,653 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2020-12-03 12:30:52,656 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-12-03 12:30:52,657 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-12-03 12:30:52,661 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-12-03 12:30:52,663 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 03.12 12:30:52" (1/1) ... [2020-12-03 12:30:52,665 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@f30240d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.12 12:30:52, skipping insertion in model container [2020-12-03 12:30:52,665 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 03.12 12:30:52" (1/1) ... [2020-12-03 12:30:52,672 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-12-03 12:30:52,687 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-12-03 12:30:52,893 WARN L226 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud-vcloud-master/worker/run_dir_ab464e3b-480f-46de-8fae-115413e7ebbd/sv-benchmarks/c/recursive/Fibonacci01-1.c[804,817] [2020-12-03 12:30:52,898 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-03 12:30:52,908 INFO L203 MainTranslator]: Completed pre-run [2020-12-03 12:30:52,925 WARN L226 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud-vcloud-master/worker/run_dir_ab464e3b-480f-46de-8fae-115413e7ebbd/sv-benchmarks/c/recursive/Fibonacci01-1.c[804,817] [2020-12-03 12:30:52,925 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-03 12:30:52,941 INFO L208 MainTranslator]: Completed translation [2020-12-03 12:30:52,942 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.12 12:30:52 WrapperNode [2020-12-03 12:30:52,942 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-12-03 12:30:52,944 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2020-12-03 12:30:52,944 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2020-12-03 12:30:52,944 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2020-12-03 12:30:52,954 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.12 12:30:52" (1/1) ... [2020-12-03 12:30:52,962 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.12 12:30:52" (1/1) ... [2020-12-03 12:30:52,981 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2020-12-03 12:30:52,982 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-12-03 12:30:52,982 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-12-03 12:30:52,982 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-12-03 12:30:52,992 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.12 12:30:52" (1/1) ... [2020-12-03 12:30:52,992 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.12 12:30:52" (1/1) ... [2020-12-03 12:30:52,994 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.12 12:30:52" (1/1) ... [2020-12-03 12:30:52,994 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.12 12:30:52" (1/1) ... [2020-12-03 12:30:52,998 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.12 12:30:52" (1/1) ... [2020-12-03 12:30:53,000 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.12 12:30:52" (1/1) ... [2020-12-03 12:30:53,002 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.12 12:30:52" (1/1) ... [2020-12-03 12:30:53,004 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-12-03 12:30:53,005 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-12-03 12:30:53,005 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-12-03 12:30:53,005 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-12-03 12:30:53,006 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.12 12:30:52" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_ab464e3b-480f-46de-8fae-115413e7ebbd/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 [2020-12-03 12:30:53,097 INFO L130 BoogieDeclarations]: Found specification of procedure fibonacci [2020-12-03 12:30:53,098 INFO L138 BoogieDeclarations]: Found implementation of procedure fibonacci [2020-12-03 12:30:53,098 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-12-03 12:30:53,098 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-12-03 12:30:53,098 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-12-03 12:30:53,099 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-12-03 12:30:53,522 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-12-03 12:30:53,522 INFO L299 CfgBuilder]: Removed 4 assume(true) statements. [2020-12-03 12:30:53,524 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.12 12:30:53 BoogieIcfgContainer [2020-12-03 12:30:53,524 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-12-03 12:30:53,525 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-12-03 12:30:53,525 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-12-03 12:30:53,533 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-12-03 12:30:53,533 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 03.12 12:30:52" (1/3) ... [2020-12-03 12:30:53,534 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@46d0ccc6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 03.12 12:30:53, skipping insertion in model container [2020-12-03 12:30:53,535 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.12 12:30:52" (2/3) ... [2020-12-03 12:30:53,535 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@46d0ccc6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 03.12 12:30:53, skipping insertion in model container [2020-12-03 12:30:53,536 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.12 12:30:53" (3/3) ... [2020-12-03 12:30:53,537 INFO L111 eAbstractionObserver]: Analyzing ICFG Fibonacci01-1.c [2020-12-03 12:30:53,552 INFO L180 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-12-03 12:30:53,556 INFO L192 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-12-03 12:30:53,567 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-12-03 12:30:53,605 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-12-03 12:30:53,605 INFO L378 AbstractCegarLoop]: Hoare is true [2020-12-03 12:30:53,605 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-12-03 12:30:53,605 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-12-03 12:30:53,605 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-12-03 12:30:53,606 INFO L382 AbstractCegarLoop]: Difference is false [2020-12-03 12:30:53,606 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-12-03 12:30:53,606 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-12-03 12:30:53,632 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states. [2020-12-03 12:30:53,637 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-12-03 12:30:53,638 INFO L414 BasicCegarLoop]: Found error trace [2020-12-03 12:30:53,639 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-03 12:30:53,639 INFO L429 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-03 12:30:53,645 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-03 12:30:53,646 INFO L82 PathProgramCache]: Analyzing trace with hash -1216674335, now seen corresponding path program 1 times [2020-12-03 12:30:53,657 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-03 12:30:53,658 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [409126188] [2020-12-03 12:30:53,658 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-03 12:30:53,798 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-03 12:30:53,980 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-03 12:30:53,981 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [409126188] [2020-12-03 12:30:53,982 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-03 12:30:53,983 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-12-03 12:30:53,984 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1375582713] [2020-12-03 12:30:53,989 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-12-03 12:30:53,989 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-03 12:30:54,005 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-12-03 12:30:54,006 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-12-03 12:30:54,008 INFO L87 Difference]: Start difference. First operand 18 states. Second operand 6 states. [2020-12-03 12:30:54,179 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-03 12:30:54,179 INFO L93 Difference]: Finished difference Result 28 states and 34 transitions. [2020-12-03 12:30:54,180 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-12-03 12:30:54,182 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 10 [2020-12-03 12:30:54,183 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-03 12:30:54,192 INFO L225 Difference]: With dead ends: 28 [2020-12-03 12:30:54,192 INFO L226 Difference]: Without dead ends: 18 [2020-12-03 12:30:54,196 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2020-12-03 12:30:54,215 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-12-03 12:30:54,237 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2020-12-03 12:30:54,239 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-12-03 12:30:54,241 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 22 transitions. [2020-12-03 12:30:54,242 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 22 transitions. Word has length 10 [2020-12-03 12:30:54,243 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-03 12:30:54,243 INFO L481 AbstractCegarLoop]: Abstraction has 18 states and 22 transitions. [2020-12-03 12:30:54,243 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-12-03 12:30:54,243 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 22 transitions. [2020-12-03 12:30:54,245 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2020-12-03 12:30:54,245 INFO L414 BasicCegarLoop]: Found error trace [2020-12-03 12:30:54,246 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-03 12:30:54,246 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-12-03 12:30:54,246 INFO L429 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-03 12:30:54,247 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-03 12:30:54,247 INFO L82 PathProgramCache]: Analyzing trace with hash 1629096597, now seen corresponding path program 1 times [2020-12-03 12:30:54,248 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-03 12:30:54,248 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [80470120] [2020-12-03 12:30:54,249 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-03 12:30:54,266 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-03 12:30:54,351 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-03 12:30:54,352 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [80470120] [2020-12-03 12:30:54,352 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-03 12:30:54,352 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-12-03 12:30:54,353 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2107769498] [2020-12-03 12:30:54,354 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-12-03 12:30:54,354 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-03 12:30:54,355 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-12-03 12:30:54,356 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-12-03 12:30:54,356 INFO L87 Difference]: Start difference. First operand 18 states and 22 transitions. Second operand 6 states. [2020-12-03 12:30:54,493 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-03 12:30:54,494 INFO L93 Difference]: Finished difference Result 24 states and 29 transitions. [2020-12-03 12:30:54,495 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-12-03 12:30:54,495 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 11 [2020-12-03 12:30:54,496 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-03 12:30:54,497 INFO L225 Difference]: With dead ends: 24 [2020-12-03 12:30:54,497 INFO L226 Difference]: Without dead ends: 20 [2020-12-03 12:30:54,498 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2020-12-03 12:30:54,499 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-12-03 12:30:54,504 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 18. [2020-12-03 12:30:54,504 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-12-03 12:30:54,505 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 22 transitions. [2020-12-03 12:30:54,506 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 22 transitions. Word has length 11 [2020-12-03 12:30:54,506 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-03 12:30:54,506 INFO L481 AbstractCegarLoop]: Abstraction has 18 states and 22 transitions. [2020-12-03 12:30:54,507 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-12-03 12:30:54,507 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 22 transitions. [2020-12-03 12:30:54,508 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-12-03 12:30:54,508 INFO L414 BasicCegarLoop]: Found error trace [2020-12-03 12:30:54,508 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-03 12:30:54,509 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-12-03 12:30:54,509 INFO L429 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-03 12:30:54,510 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-03 12:30:54,510 INFO L82 PathProgramCache]: Analyzing trace with hash 161002844, now seen corresponding path program 1 times [2020-12-03 12:30:54,510 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-03 12:30:54,511 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2121554899] [2020-12-03 12:30:54,511 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-03 12:30:54,545 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-03 12:30:54,601 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 5 proven. 3 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-12-03 12:30:54,602 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2121554899] [2020-12-03 12:30:54,602 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1056559687] [2020-12-03 12:30:54,602 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_ab464e3b-480f-46de-8fae-115413e7ebbd/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 [2020-12-03 12:30:54,708 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-03 12:30:54,711 INFO L263 TraceCheckSpWp]: Trace formula consists of 82 conjuncts, 13 conjunts are in the unsatisfiable core [2020-12-03 12:30:54,717 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-03 12:30:55,117 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-12-03 12:30:55,123 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-03 12:30:55,760 INFO L639 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-12-03 12:30:55,769 INFO L639 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-12-03 12:30:55,861 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-12-03 12:30:55,862 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1450746713] [2020-12-03 12:30:55,890 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2020-12-03 12:30:55,890 INFO L166 IcfgInterpreter]: Building call graph [2020-12-03 12:30:55,906 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:138) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.iterateNew(TraceAbstractionStarter.java:345) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:198) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:150) 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) [2020-12-03 12:30:55,910 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-12-03 12:30:55,911 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 10, 11] total 20 [2020-12-03 12:30:55,912 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2013881099] [2020-12-03 12:30:55,914 INFO L461 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-12-03 12:30:55,914 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-03 12:30:55,915 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-12-03 12:30:55,918 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=318, Unknown=0, NotChecked=0, Total=380 [2020-12-03 12:30:55,918 INFO L87 Difference]: Start difference. First operand 18 states and 22 transitions. Second operand 20 states. [2020-12-03 12:30:56,163 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-03 12:30:56,163 INFO L93 Difference]: Finished difference Result 35 states and 46 transitions. [2020-12-03 12:30:56,164 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-12-03 12:30:56,164 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 23 [2020-12-03 12:30:56,164 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-03 12:30:56,165 INFO L225 Difference]: With dead ends: 35 [2020-12-03 12:30:56,166 INFO L226 Difference]: Without dead ends: 20 [2020-12-03 12:30:56,167 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 34 SyntacticMatches, 1 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 97 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=96, Invalid=456, Unknown=0, NotChecked=0, Total=552 [2020-12-03 12:30:56,168 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-12-03 12:30:56,172 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2020-12-03 12:30:56,172 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-12-03 12:30:56,174 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 24 transitions. [2020-12-03 12:30:56,174 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 24 transitions. Word has length 23 [2020-12-03 12:30:56,174 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-03 12:30:56,174 INFO L481 AbstractCegarLoop]: Abstraction has 20 states and 24 transitions. [2020-12-03 12:30:56,175 INFO L482 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-12-03 12:30:56,175 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 24 transitions. [2020-12-03 12:30:56,176 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-12-03 12:30:56,176 INFO L414 BasicCegarLoop]: Found error trace [2020-12-03 12:30:56,177 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-03 12:30:56,390 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2020-12-03 12:30:56,390 INFO L429 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-03 12:30:56,391 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-03 12:30:56,391 INFO L82 PathProgramCache]: Analyzing trace with hash 592483530, now seen corresponding path program 1 times [2020-12-03 12:30:56,391 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-03 12:30:56,391 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [501555222] [2020-12-03 12:30:56,391 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-03 12:30:56,413 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-03 12:30:56,551 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-12-03 12:30:56,552 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [501555222] [2020-12-03 12:30:56,552 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1274670917] [2020-12-03 12:30:56,553 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_ab464e3b-480f-46de-8fae-115413e7ebbd/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 [2020-12-03 12:30:56,599 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-03 12:30:56,601 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 13 conjunts are in the unsatisfiable core [2020-12-03 12:30:56,603 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-03 12:30:56,836 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-12-03 12:30:56,836 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-03 12:30:57,237 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-12-03 12:30:57,237 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1569873779] [2020-12-03 12:30:57,240 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2020-12-03 12:30:57,240 INFO L166 IcfgInterpreter]: Building call graph [2020-12-03 12:30:57,240 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:138) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.iterateNew(TraceAbstractionStarter.java:345) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:198) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:150) 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) [2020-12-03 12:30:57,241 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-12-03 12:30:57,241 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 11] total 21 [2020-12-03 12:30:57,241 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [248425480] [2020-12-03 12:30:57,242 INFO L461 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-12-03 12:30:57,242 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-03 12:30:57,242 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-12-03 12:30:57,243 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=73, Invalid=347, Unknown=0, NotChecked=0, Total=420 [2020-12-03 12:30:57,243 INFO L87 Difference]: Start difference. First operand 20 states and 24 transitions. Second operand 21 states. [2020-12-03 12:30:57,476 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-03 12:30:57,476 INFO L93 Difference]: Finished difference Result 31 states and 40 transitions. [2020-12-03 12:30:57,476 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-12-03 12:30:57,476 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 24 [2020-12-03 12:30:57,477 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-03 12:30:57,478 INFO L225 Difference]: With dead ends: 31 [2020-12-03 12:30:57,478 INFO L226 Difference]: Without dead ends: 27 [2020-12-03 12:30:57,479 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 38 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 127 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=132, Invalid=570, Unknown=0, NotChecked=0, Total=702 [2020-12-03 12:30:57,480 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2020-12-03 12:30:57,486 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 25. [2020-12-03 12:30:57,486 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-12-03 12:30:57,487 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 34 transitions. [2020-12-03 12:30:57,488 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 34 transitions. Word has length 24 [2020-12-03 12:30:57,488 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-03 12:30:57,488 INFO L481 AbstractCegarLoop]: Abstraction has 25 states and 34 transitions. [2020-12-03 12:30:57,488 INFO L482 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-12-03 12:30:57,488 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 34 transitions. [2020-12-03 12:30:57,490 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-12-03 12:30:57,490 INFO L414 BasicCegarLoop]: Found error trace [2020-12-03 12:30:57,490 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-03 12:30:57,706 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-03 12:30:57,706 INFO L429 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-03 12:30:57,706 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-03 12:30:57,707 INFO L82 PathProgramCache]: Analyzing trace with hash 1310194259, now seen corresponding path program 2 times [2020-12-03 12:30:57,707 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-03 12:30:57,707 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1738899001] [2020-12-03 12:30:57,707 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-03 12:30:57,728 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-03 12:30:57,818 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 23 proven. 8 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2020-12-03 12:30:57,819 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1738899001] [2020-12-03 12:30:57,819 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [144145092] [2020-12-03 12:30:57,819 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_ab464e3b-480f-46de-8fae-115413e7ebbd/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 [2020-12-03 12:30:57,873 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2020-12-03 12:30:57,873 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-03 12:30:57,875 INFO L263 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 17 conjunts are in the unsatisfiable core [2020-12-03 12:30:57,881 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-03 12:30:58,114 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 16 proven. 14 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2020-12-03 12:30:58,115 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-03 12:30:58,863 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 7 proven. 24 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2020-12-03 12:30:58,864 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [281157104] [2020-12-03 12:30:58,869 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2020-12-03 12:30:58,872 INFO L166 IcfgInterpreter]: Building call graph [2020-12-03 12:30:58,873 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:138) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.iterateNew(TraceAbstractionStarter.java:345) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:198) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:150) 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) [2020-12-03 12:30:58,874 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-12-03 12:30:58,874 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 13, 14] total 27 [2020-12-03 12:30:58,874 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1077059161] [2020-12-03 12:30:58,876 INFO L461 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-12-03 12:30:58,877 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-03 12:30:58,877 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-12-03 12:30:58,878 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=613, Unknown=0, NotChecked=0, Total=702 [2020-12-03 12:30:58,879 INFO L87 Difference]: Start difference. First operand 25 states and 34 transitions. Second operand 27 states. [2020-12-03 12:30:59,546 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-03 12:30:59,546 INFO L93 Difference]: Finished difference Result 53 states and 78 transitions. [2020-12-03 12:30:59,547 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-12-03 12:30:59,547 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 37 [2020-12-03 12:30:59,548 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-03 12:30:59,549 INFO L225 Difference]: With dead ends: 53 [2020-12-03 12:30:59,549 INFO L226 Difference]: Without dead ends: 31 [2020-12-03 12:30:59,551 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 58 SyntacticMatches, 1 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 256 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=279, Invalid=1281, Unknown=0, NotChecked=0, Total=1560 [2020-12-03 12:30:59,551 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-12-03 12:30:59,557 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 25. [2020-12-03 12:30:59,557 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-12-03 12:30:59,559 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 33 transitions. [2020-12-03 12:30:59,559 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 33 transitions. Word has length 37 [2020-12-03 12:30:59,559 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-03 12:30:59,559 INFO L481 AbstractCegarLoop]: Abstraction has 25 states and 33 transitions. [2020-12-03 12:30:59,559 INFO L482 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-12-03 12:30:59,560 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 33 transitions. [2020-12-03 12:30:59,561 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-12-03 12:30:59,561 INFO L414 BasicCegarLoop]: Found error trace [2020-12-03 12:30:59,561 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-03 12:30:59,786 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-03 12:30:59,786 INFO L429 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-03 12:30:59,786 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-03 12:30:59,786 INFO L82 PathProgramCache]: Analyzing trace with hash 651238953, now seen corresponding path program 3 times [2020-12-03 12:30:59,787 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-03 12:30:59,787 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [281637303] [2020-12-03 12:30:59,787 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-03 12:30:59,822 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-03 12:30:59,988 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2020-12-03 12:30:59,989 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [281637303] [2020-12-03 12:30:59,989 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [342569497] [2020-12-03 12:30:59,989 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_ab464e3b-480f-46de-8fae-115413e7ebbd/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 [2020-12-03 12:31:00,062 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-03 12:31:00,062 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-03 12:31:00,063 INFO L263 TraceCheckSpWp]: Trace formula consists of 115 conjuncts, 19 conjunts are in the unsatisfiable core [2020-12-03 12:31:00,066 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-03 12:31:00,365 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 8 proven. 24 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-12-03 12:31:00,366 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-03 12:31:01,134 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 4 proven. 35 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2020-12-03 12:31:01,135 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [226778397] [2020-12-03 12:31:01,142 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2020-12-03 12:31:01,143 INFO L166 IcfgInterpreter]: Building call graph [2020-12-03 12:31:01,143 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:138) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.iterateNew(TraceAbstractionStarter.java:345) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:198) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:150) 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) [2020-12-03 12:31:01,145 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-12-03 12:31:01,151 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 14, 16] total 29 [2020-12-03 12:31:01,152 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [409928078] [2020-12-03 12:31:01,155 INFO L461 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-12-03 12:31:01,156 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-03 12:31:01,157 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-12-03 12:31:01,158 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=125, Invalid=687, Unknown=0, NotChecked=0, Total=812 [2020-12-03 12:31:01,158 INFO L87 Difference]: Start difference. First operand 25 states and 33 transitions. Second operand 29 states. [2020-12-03 12:31:01,803 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-03 12:31:01,803 INFO L93 Difference]: Finished difference Result 53 states and 85 transitions. [2020-12-03 12:31:01,804 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-12-03 12:31:01,804 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 38 [2020-12-03 12:31:01,805 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-03 12:31:01,817 INFO L225 Difference]: With dead ends: 53 [2020-12-03 12:31:01,818 INFO L226 Difference]: Without dead ends: 47 [2020-12-03 12:31:01,820 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 63 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 503 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=330, Invalid=1650, Unknown=0, NotChecked=0, Total=1980 [2020-12-03 12:31:01,822 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-12-03 12:31:01,839 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 35. [2020-12-03 12:31:01,839 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-12-03 12:31:01,843 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 57 transitions. [2020-12-03 12:31:01,844 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 57 transitions. Word has length 38 [2020-12-03 12:31:01,846 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-03 12:31:01,847 INFO L481 AbstractCegarLoop]: Abstraction has 35 states and 57 transitions. [2020-12-03 12:31:01,847 INFO L482 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-12-03 12:31:01,847 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 57 transitions. [2020-12-03 12:31:01,858 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2020-12-03 12:31:01,858 INFO L414 BasicCegarLoop]: Found error trace [2020-12-03 12:31:01,858 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 9, 5, 5, 5, 5, 5, 5, 5, 4, 2, 1, 1, 1, 1, 1, 1, 1] [2020-12-03 12:31:02,059 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-03 12:31:02,059 INFO L429 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-03 12:31:02,059 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-03 12:31:02,059 INFO L82 PathProgramCache]: Analyzing trace with hash 1360547340, now seen corresponding path program 4 times [2020-12-03 12:31:02,059 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-03 12:31:02,060 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [323017596] [2020-12-03 12:31:02,060 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-03 12:31:02,093 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-03 12:31:02,256 INFO L134 CoverageAnalysis]: Checked inductivity of 296 backedges. 55 proven. 93 refuted. 0 times theorem prover too weak. 148 trivial. 0 not checked. [2020-12-03 12:31:02,262 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [323017596] [2020-12-03 12:31:02,264 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [917185327] [2020-12-03 12:31:02,264 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_ab464e3b-480f-46de-8fae-115413e7ebbd/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 [2020-12-03 12:31:02,345 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-03 12:31:02,347 INFO L263 TraceCheckSpWp]: Trace formula consists of 206 conjuncts, 10 conjunts are in the unsatisfiable core [2020-12-03 12:31:02,351 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-03 12:31:02,459 INFO L134 CoverageAnalysis]: Checked inductivity of 296 backedges. 72 proven. 104 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2020-12-03 12:31:02,459 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-03 12:31:02,957 INFO L134 CoverageAnalysis]: Checked inductivity of 296 backedges. 72 proven. 107 refuted. 0 times theorem prover too weak. 117 trivial. 0 not checked. [2020-12-03 12:31:02,958 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [504989132] [2020-12-03 12:31:02,963 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2020-12-03 12:31:02,964 INFO L166 IcfgInterpreter]: Building call graph [2020-12-03 12:31:02,964 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:138) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.iterateNew(TraceAbstractionStarter.java:345) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:198) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:150) 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) [2020-12-03 12:31:02,965 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-12-03 12:31:02,965 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9, 11] total 16 [2020-12-03 12:31:02,966 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [994699993] [2020-12-03 12:31:02,968 INFO L461 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-12-03 12:31:02,968 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-03 12:31:02,969 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-12-03 12:31:02,969 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=187, Unknown=0, NotChecked=0, Total=240 [2020-12-03 12:31:02,969 INFO L87 Difference]: Start difference. First operand 35 states and 57 transitions. Second operand 16 states. [2020-12-03 12:31:03,197 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-03 12:31:03,197 INFO L93 Difference]: Finished difference Result 78 states and 142 transitions. [2020-12-03 12:31:03,197 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-12-03 12:31:03,198 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 79 [2020-12-03 12:31:03,199 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-03 12:31:03,203 INFO L225 Difference]: With dead ends: 78 [2020-12-03 12:31:03,203 INFO L226 Difference]: Without dead ends: 46 [2020-12-03 12:31:03,210 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 174 GetRequests, 151 SyntacticMatches, 2 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 56 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=155, Invalid=351, Unknown=0, NotChecked=0, Total=506 [2020-12-03 12:31:03,210 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-12-03 12:31:03,225 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 40. [2020-12-03 12:31:03,225 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-12-03 12:31:03,226 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 54 transitions. [2020-12-03 12:31:03,226 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 54 transitions. Word has length 79 [2020-12-03 12:31:03,227 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-03 12:31:03,227 INFO L481 AbstractCegarLoop]: Abstraction has 40 states and 54 transitions. [2020-12-03 12:31:03,227 INFO L482 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-12-03 12:31:03,227 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 54 transitions. [2020-12-03 12:31:03,228 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2020-12-03 12:31:03,228 INFO L414 BasicCegarLoop]: Found error trace [2020-12-03 12:31:03,229 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 11, 6, 6, 6, 6, 6, 6, 6, 5, 2, 1, 1, 1, 1, 1, 1, 1] [2020-12-03 12:31:03,454 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2020-12-03 12:31:03,454 INFO L429 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-03 12:31:03,454 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-03 12:31:03,454 INFO L82 PathProgramCache]: Analyzing trace with hash -1581298675, now seen corresponding path program 5 times [2020-12-03 12:31:03,454 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-03 12:31:03,455 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2114861629] [2020-12-03 12:31:03,455 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-03 12:31:03,502 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-03 12:31:03,663 INFO L134 CoverageAnalysis]: Checked inductivity of 427 backedges. 91 proven. 165 refuted. 0 times theorem prover too weak. 171 trivial. 0 not checked. [2020-12-03 12:31:03,663 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2114861629] [2020-12-03 12:31:03,663 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1245690517] [2020-12-03 12:31:03,663 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_ab464e3b-480f-46de-8fae-115413e7ebbd/bin/utaipan/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-03 12:31:03,735 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2020-12-03 12:31:03,735 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-03 12:31:03,736 INFO L263 TraceCheckSpWp]: Trace formula consists of 161 conjuncts, 8 conjunts are in the unsatisfiable core [2020-12-03 12:31:03,739 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-03 12:31:03,851 INFO L134 CoverageAnalysis]: Checked inductivity of 427 backedges. 174 proven. 17 refuted. 0 times theorem prover too weak. 236 trivial. 0 not checked. [2020-12-03 12:31:03,851 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-03 12:31:04,312 INFO L134 CoverageAnalysis]: Checked inductivity of 427 backedges. 174 proven. 18 refuted. 0 times theorem prover too weak. 235 trivial. 0 not checked. [2020-12-03 12:31:04,312 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1885502392] [2020-12-03 12:31:04,316 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2020-12-03 12:31:04,316 INFO L166 IcfgInterpreter]: Building call graph [2020-12-03 12:31:04,317 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:138) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.iterateNew(TraceAbstractionStarter.java:345) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:198) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:150) 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) [2020-12-03 12:31:04,318 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-12-03 12:31:04,318 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 8, 9] total 18 [2020-12-03 12:31:04,319 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1504199927] [2020-12-03 12:31:04,320 INFO L461 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-12-03 12:31:04,320 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-03 12:31:04,320 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-12-03 12:31:04,321 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=246, Unknown=0, NotChecked=0, Total=306 [2020-12-03 12:31:04,321 INFO L87 Difference]: Start difference. First operand 40 states and 54 transitions. Second operand 18 states. [2020-12-03 12:31:04,711 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-03 12:31:04,711 INFO L93 Difference]: Finished difference Result 97 states and 152 transitions. [2020-12-03 12:31:04,711 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-12-03 12:31:04,712 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 93 [2020-12-03 12:31:04,712 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-03 12:31:04,713 INFO L225 Difference]: With dead ends: 97 [2020-12-03 12:31:04,713 INFO L226 Difference]: Without dead ends: 60 [2020-12-03 12:31:04,715 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 210 GetRequests, 181 SyntacticMatches, 2 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 120 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=212, Invalid=600, Unknown=0, NotChecked=0, Total=812 [2020-12-03 12:31:04,715 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2020-12-03 12:31:04,736 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 51. [2020-12-03 12:31:04,736 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-12-03 12:31:04,737 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 65 transitions. [2020-12-03 12:31:04,738 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 65 transitions. Word has length 93 [2020-12-03 12:31:04,738 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-03 12:31:04,738 INFO L481 AbstractCegarLoop]: Abstraction has 51 states and 65 transitions. [2020-12-03 12:31:04,738 INFO L482 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-12-03 12:31:04,738 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 65 transitions. [2020-12-03 12:31:04,740 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 134 [2020-12-03 12:31:04,740 INFO L414 BasicCegarLoop]: Found error trace [2020-12-03 12:31:04,741 INFO L422 BasicCegarLoop]: trace histogram [19, 19, 15, 9, 9, 9, 9, 9, 9, 9, 6, 4, 1, 1, 1, 1, 1, 1, 1] [2020-12-03 12:31:04,941 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-03 12:31:04,941 INFO L429 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-03 12:31:04,942 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-03 12:31:04,942 INFO L82 PathProgramCache]: Analyzing trace with hash -1101187310, now seen corresponding path program 6 times [2020-12-03 12:31:04,942 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-03 12:31:04,942 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [666619747] [2020-12-03 12:31:04,942 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-03 12:31:04,991 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-03 12:31:05,166 INFO L134 CoverageAnalysis]: Checked inductivity of 933 backedges. 181 proven. 305 refuted. 0 times theorem prover too weak. 447 trivial. 0 not checked. [2020-12-03 12:31:05,167 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [666619747] [2020-12-03 12:31:05,167 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1706900479] [2020-12-03 12:31:05,167 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_ab464e3b-480f-46de-8fae-115413e7ebbd/bin/utaipan/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-03 12:31:05,257 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-03 12:31:05,257 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-03 12:31:05,259 INFO L263 TraceCheckSpWp]: Trace formula consists of 235 conjuncts, 18 conjunts are in the unsatisfiable core [2020-12-03 12:31:05,273 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-03 12:31:05,445 INFO L134 CoverageAnalysis]: Checked inductivity of 933 backedges. 207 proven. 356 refuted. 0 times theorem prover too weak. 370 trivial. 0 not checked. [2020-12-03 12:31:05,445 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-03 12:31:06,877 INFO L134 CoverageAnalysis]: Checked inductivity of 933 backedges. 207 proven. 383 refuted. 0 times theorem prover too weak. 343 trivial. 0 not checked. [2020-12-03 12:31:06,877 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [493750397] [2020-12-03 12:31:06,880 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2020-12-03 12:31:06,880 INFO L166 IcfgInterpreter]: Building call graph [2020-12-03 12:31:06,881 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:138) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.iterateNew(TraceAbstractionStarter.java:345) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:198) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:150) 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) [2020-12-03 12:31:06,882 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-12-03 12:31:06,882 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13, 19] total 24 [2020-12-03 12:31:06,882 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1089906855] [2020-12-03 12:31:06,883 INFO L461 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-12-03 12:31:06,883 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-03 12:31:06,884 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-12-03 12:31:06,884 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=103, Invalid=449, Unknown=0, NotChecked=0, Total=552 [2020-12-03 12:31:06,885 INFO L87 Difference]: Start difference. First operand 51 states and 65 transitions. Second operand 24 states. [2020-12-03 12:31:07,466 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-03 12:31:07,466 INFO L93 Difference]: Finished difference Result 121 states and 179 transitions. [2020-12-03 12:31:07,467 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-12-03 12:31:07,467 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 133 [2020-12-03 12:31:07,470 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-03 12:31:07,475 INFO L225 Difference]: With dead ends: 121 [2020-12-03 12:31:07,475 INFO L226 Difference]: Without dead ends: 75 [2020-12-03 12:31:07,476 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 297 GetRequests, 257 SyntacticMatches, 2 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 276 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=416, Invalid=1144, Unknown=0, NotChecked=0, Total=1560 [2020-12-03 12:31:07,477 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2020-12-03 12:31:07,492 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 68. [2020-12-03 12:31:07,492 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 68 states. [2020-12-03 12:31:07,493 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 94 transitions. [2020-12-03 12:31:07,494 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 94 transitions. Word has length 133 [2020-12-03 12:31:07,494 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-03 12:31:07,495 INFO L481 AbstractCegarLoop]: Abstraction has 68 states and 94 transitions. [2020-12-03 12:31:07,495 INFO L482 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-12-03 12:31:07,495 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 94 transitions. [2020-12-03 12:31:07,497 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 175 [2020-12-03 12:31:07,498 INFO L414 BasicCegarLoop]: Found error trace [2020-12-03 12:31:07,498 INFO L422 BasicCegarLoop]: trace histogram [25, 25, 20, 12, 12, 12, 12, 12, 12, 12, 8, 5, 1, 1, 1, 1, 1, 1, 1] [2020-12-03 12:31:07,718 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-03 12:31:07,718 INFO L429 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-03 12:31:07,718 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-03 12:31:07,719 INFO L82 PathProgramCache]: Analyzing trace with hash -1526876107, now seen corresponding path program 7 times [2020-12-03 12:31:07,719 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-03 12:31:07,719 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [629586042] [2020-12-03 12:31:07,719 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-03 12:31:07,765 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-03 12:31:08,166 INFO L134 CoverageAnalysis]: Checked inductivity of 1654 backedges. 77 proven. 845 refuted. 0 times theorem prover too weak. 732 trivial. 0 not checked. [2020-12-03 12:31:08,166 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [629586042] [2020-12-03 12:31:08,166 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1169411689] [2020-12-03 12:31:08,166 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_ab464e3b-480f-46de-8fae-115413e7ebbd/bin/utaipan/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-03 12:31:08,275 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-03 12:31:08,278 INFO L263 TraceCheckSpWp]: Trace formula consists of 417 conjuncts, 65 conjunts are in the unsatisfiable core [2020-12-03 12:31:08,282 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-03 12:31:09,100 INFO L134 CoverageAnalysis]: Checked inductivity of 1654 backedges. 258 proven. 604 refuted. 0 times theorem prover too weak. 792 trivial. 0 not checked. [2020-12-03 12:31:09,100 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-03 12:31:09,940 WARN L197 SmtUtils]: Spent 125.00 ms on a formula simplification that was a NOOP. DAG size: 92 [2020-12-03 12:31:10,047 WARN L197 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 92 [2020-12-03 12:31:10,163 WARN L197 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 97 [2020-12-03 12:31:10,286 WARN L197 SmtUtils]: Spent 122.00 ms on a formula simplification that was a NOOP. DAG size: 97 [2020-12-03 12:31:10,841 WARN L197 SmtUtils]: Spent 221.00 ms on a formula simplification that was a NOOP. DAG size: 142 [2020-12-03 12:31:11,045 WARN L197 SmtUtils]: Spent 202.00 ms on a formula simplification that was a NOOP. DAG size: 142 [2020-12-03 12:31:11,271 WARN L197 SmtUtils]: Spent 222.00 ms on a formula simplification that was a NOOP. DAG size: 146 [2020-12-03 12:31:11,531 WARN L197 SmtUtils]: Spent 257.00 ms on a formula simplification that was a NOOP. DAG size: 146 [2020-12-03 12:31:13,384 WARN L197 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 92 [2020-12-03 12:31:13,490 WARN L197 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 97 [2020-12-03 12:31:13,613 WARN L197 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 97 [2020-12-03 12:31:15,617 INFO L134 CoverageAnalysis]: Checked inductivity of 1654 backedges. 207 proven. 695 refuted. 0 times theorem prover too weak. 752 trivial. 0 not checked. [2020-12-03 12:31:15,618 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [717308506] [2020-12-03 12:31:15,620 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2020-12-03 12:31:15,620 INFO L166 IcfgInterpreter]: Building call graph [2020-12-03 12:31:15,621 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:138) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.iterateNew(TraceAbstractionStarter.java:345) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:198) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:150) 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) [2020-12-03 12:31:15,622 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-12-03 12:31:15,622 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 30, 35] total 65 [2020-12-03 12:31:15,622 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1404567749] [2020-12-03 12:31:15,625 INFO L461 AbstractCegarLoop]: Interpolant automaton has 65 states [2020-12-03 12:31:15,625 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-03 12:31:15,627 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 65 interpolants. [2020-12-03 12:31:15,628 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=423, Invalid=3737, Unknown=0, NotChecked=0, Total=4160 [2020-12-03 12:31:15,629 INFO L87 Difference]: Start difference. First operand 68 states and 94 transitions. Second operand 65 states. [2020-12-03 12:31:17,277 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-03 12:31:17,278 INFO L93 Difference]: Finished difference Result 106 states and 173 transitions. [2020-12-03 12:31:17,278 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2020-12-03 12:31:17,278 INFO L78 Accepts]: Start accepts. Automaton has 65 states. Word has length 174 [2020-12-03 12:31:17,279 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-03 12:31:17,280 INFO L225 Difference]: With dead ends: 106 [2020-12-03 12:31:17,280 INFO L226 Difference]: Without dead ends: 0 [2020-12-03 12:31:17,284 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 437 GetRequests, 342 SyntacticMatches, 0 SemanticMatches, 95 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3109 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=1106, Invalid=8206, Unknown=0, NotChecked=0, Total=9312 [2020-12-03 12:31:17,284 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-12-03 12:31:17,285 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-12-03 12:31:17,285 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-12-03 12:31:17,285 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-12-03 12:31:17,285 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 174 [2020-12-03 12:31:17,285 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-03 12:31:17,286 INFO L481 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-12-03 12:31:17,286 INFO L482 AbstractCegarLoop]: Interpolant automaton has 65 states. [2020-12-03 12:31:17,286 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-12-03 12:31:17,286 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-12-03 12:31:17,510 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2020-12-03 12:31:17,511 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-12-03 12:31:17,980 WARN L197 SmtUtils]: Spent 287.00 ms on a formula simplification. DAG size of input: 60 DAG size of output: 29 [2020-12-03 12:31:18,032 INFO L262 CegarLoopResult]: For program point fibonacciFINAL(lines 16 24) no Hoare annotation was computed. [2020-12-03 12:31:18,032 INFO L265 CegarLoopResult]: At program point fibonacciENTRY(lines 16 24) the Hoare annotation is: true [2020-12-03 12:31:18,032 INFO L258 CegarLoopResult]: At program point L22(line 22) the Hoare annotation is: (and (<= |fibonacci_#in~n| fibonacci_~n) (< 1 fibonacci_~n) (<= fibonacci_~n |fibonacci_#in~n|)) [2020-12-03 12:31:18,032 INFO L262 CegarLoopResult]: For program point L22-1(line 22) no Hoare annotation was computed. [2020-12-03 12:31:18,033 INFO L258 CegarLoopResult]: At program point L22-2(line 22) the Hoare annotation is: (let ((.cse2 (= |fibonacci_#t~ret7| 1)) (.cse3 (<= |fibonacci_#in~n| fibonacci_~n)) (.cse0 (<= 4 fibonacci_~n)) (.cse1 (<= fibonacci_~n |fibonacci_#in~n|))) (or (and .cse0 (<= |fibonacci_#in~n| 4) .cse1 (<= |fibonacci_#in~n| (+ |fibonacci_#t~ret7| 2))) (and (<= 3 fibonacci_~n) (<= |fibonacci_#in~n| 3) .cse2 .cse1) (and (<= |fibonacci_#in~n| 2) .cse2 (< 1 fibonacci_~n) .cse1) (and .cse3 .cse0 (<= 3 |fibonacci_#t~ret7|) (<= |fibonacci_#in~n| 5) .cse1) (and (<= |fibonacci_#in~n| (+ |fibonacci_#t~ret7| 1)) .cse3 .cse0 .cse1))) [2020-12-03 12:31:18,033 INFO L262 CegarLoopResult]: For program point L19(lines 19 23) no Hoare annotation was computed. [2020-12-03 12:31:18,033 INFO L262 CegarLoopResult]: For program point L22-3(line 22) no Hoare annotation was computed. [2020-12-03 12:31:18,033 INFO L262 CegarLoopResult]: For program point fibonacciEXIT(lines 16 24) no Hoare annotation was computed. [2020-12-03 12:31:18,033 INFO L262 CegarLoopResult]: For program point L17(lines 17 23) no Hoare annotation was computed. [2020-12-03 12:31:18,033 INFO L262 CegarLoopResult]: For program point L33(lines 33 37) no Hoare annotation was computed. [2020-12-03 12:31:18,033 INFO L262 CegarLoopResult]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2020-12-03 12:31:18,033 INFO L265 CegarLoopResult]: At program point L32(line 32) the Hoare annotation is: true [2020-12-03 12:31:18,033 INFO L262 CegarLoopResult]: For program point L32-1(line 32) no Hoare annotation was computed. [2020-12-03 12:31:18,033 INFO L262 CegarLoopResult]: For program point ULTIMATE.startENTRY(line -1) no Hoare annotation was computed. [2020-12-03 12:31:18,033 INFO L262 CegarLoopResult]: For program point L29(lines 29 31) no Hoare annotation was computed. [2020-12-03 12:31:18,034 INFO L265 CegarLoopResult]: At program point L27(lines 27 38) the Hoare annotation is: true [2020-12-03 12:31:18,034 INFO L262 CegarLoopResult]: For program point ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION(line 36) no Hoare annotation was computed. [2020-12-03 12:31:18,034 INFO L262 CegarLoopResult]: For program point L36(line 36) no Hoare annotation was computed. [2020-12-03 12:31:18,045 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 03.12 12:31:18 BoogieIcfgContainer [2020-12-03 12:31:18,045 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-12-03 12:31:18,046 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2020-12-03 12:31:18,046 INFO L271 PluginConnector]: Initializing Witness Printer... [2020-12-03 12:31:18,046 INFO L275 PluginConnector]: Witness Printer initialized [2020-12-03 12:31:18,047 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.12 12:30:53" (3/4) ... [2020-12-03 12:31:18,050 INFO L137 WitnessPrinter]: Generating witness for correct program [2020-12-03 12:31:18,057 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure fibonacci [2020-12-03 12:31:18,065 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 11 nodes and edges [2020-12-03 12:31:18,065 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 4 nodes and edges [2020-12-03 12:31:18,065 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 1 nodes and edges [2020-12-03 12:31:18,066 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 1 nodes and edges [2020-12-03 12:31:18,113 INFO L141 WitnessManager]: Wrote witness to /tmp/vcloud-vcloud-master/worker/run_dir_ab464e3b-480f-46de-8fae-115413e7ebbd/bin/utaipan/witness.graphml [2020-12-03 12:31:18,114 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2020-12-03 12:31:18,115 INFO L168 Benchmark]: Toolchain (without parser) took 25460.69 ms. Allocated memory was 88.1 MB in the beginning and 337.6 MB in the end (delta: 249.6 MB). Free memory was 53.4 MB in the beginning and 296.5 MB in the end (delta: -243.1 MB). Peak memory consumption was 6.9 MB. Max. memory is 16.1 GB. [2020-12-03 12:31:18,121 INFO L168 Benchmark]: CDTParser took 0.25 ms. Allocated memory is still 88.1 MB. Free memory is still 69.2 MB. There was no memory consumed. Max. memory is 16.1 GB. [2020-12-03 12:31:18,122 INFO L168 Benchmark]: CACSL2BoogieTranslator took 286.60 ms. Allocated memory is still 88.1 MB. Free memory was 53.2 MB in the beginning and 65.0 MB in the end (delta: -11.8 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. [2020-12-03 12:31:18,122 INFO L168 Benchmark]: Boogie Procedure Inliner took 37.45 ms. Allocated memory is still 88.1 MB. Free memory was 65.0 MB in the beginning and 63.8 MB in the end (delta: 1.2 MB). There was no memory consumed. Max. memory is 16.1 GB. [2020-12-03 12:31:18,122 INFO L168 Benchmark]: Boogie Preprocessor took 21.93 ms. Allocated memory is still 88.1 MB. Free memory was 63.8 MB in the beginning and 62.9 MB in the end (delta: 925.7 kB). There was no memory consumed. Max. memory is 16.1 GB. [2020-12-03 12:31:18,123 INFO L168 Benchmark]: RCFGBuilder took 519.51 ms. Allocated memory is still 88.1 MB. Free memory was 62.6 MB in the beginning and 49.1 MB in the end (delta: 13.4 MB). Peak memory consumption was 12.6 MB. Max. memory is 16.1 GB. [2020-12-03 12:31:18,123 INFO L168 Benchmark]: TraceAbstraction took 24520.23 ms. Allocated memory was 88.1 MB in the beginning and 337.6 MB in the end (delta: 249.6 MB). Free memory was 48.8 MB in the beginning and 299.7 MB in the end (delta: -250.9 MB). Peak memory consumption was 185.6 MB. Max. memory is 16.1 GB. [2020-12-03 12:31:18,124 INFO L168 Benchmark]: Witness Printer took 67.75 ms. Allocated memory is still 337.6 MB. Free memory was 299.7 MB in the beginning and 296.5 MB in the end (delta: 3.2 MB). Peak memory consumption was 4.2 MB. Max. memory is 16.1 GB. [2020-12-03 12:31:18,126 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.25 ms. Allocated memory is still 88.1 MB. Free memory is still 69.2 MB. There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 286.60 ms. Allocated memory is still 88.1 MB. Free memory was 53.2 MB in the beginning and 65.0 MB in the end (delta: -11.8 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. * Boogie Procedure Inliner took 37.45 ms. Allocated memory is still 88.1 MB. Free memory was 65.0 MB in the beginning and 63.8 MB in the end (delta: 1.2 MB). There was no memory consumed. Max. memory is 16.1 GB. * Boogie Preprocessor took 21.93 ms. Allocated memory is still 88.1 MB. Free memory was 63.8 MB in the beginning and 62.9 MB in the end (delta: 925.7 kB). There was no memory consumed. Max. memory is 16.1 GB. * RCFGBuilder took 519.51 ms. Allocated memory is still 88.1 MB. Free memory was 62.6 MB in the beginning and 49.1 MB in the end (delta: 13.4 MB). Peak memory consumption was 12.6 MB. Max. memory is 16.1 GB. * TraceAbstraction took 24520.23 ms. Allocated memory was 88.1 MB in the beginning and 337.6 MB in the end (delta: 249.6 MB). Free memory was 48.8 MB in the beginning and 299.7 MB in the end (delta: -250.9 MB). Peak memory consumption was 185.6 MB. Max. memory is 16.1 GB. * Witness Printer took 67.75 ms. Allocated memory is still 337.6 MB. Free memory was 299.7 MB in the beginning and 296.5 MB in the end (delta: 3.2 MB). Peak memory consumption was 4.2 MB. Max. memory is 16.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 36]: call to reach_error is unreachable For all program executions holds that call to reach_error is unreachable at this location - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - InvariantResult [Line: 27]: Loop Invariant Derived loop invariant: 1 - StatisticsResult: Ultimate Automizer benchmark data CFG has 2 procedures, 18 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 23.9s, OverallIterations: 10, TraceHistogramMax: 25, AutomataDifference: 5.0s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.5s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 155 SDtfs, 530 SDslu, 902 SDs, 0 SdLazy, 3024 SolverSat, 775 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 2.0s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 1455 GetRequests, 1128 SyntacticMatches, 8 SemanticMatches, 319 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4544 ImplicationChecksByTransitivity, 5.4s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=68occurred in iteration=9, 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, 10 MinimizatonAttempts, 44 StatesRemovedByMinimization, 7 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 5 LocationsWithAnnotation, 113 PreInvPairs, 187 NumberOfFragments, 86 HoareAnnotationTreeSize, 113 FomulaSimplifications, 708 FormulaSimplificationTreeSizeReduction, 0.1s HoareSimplificationTime, 5 FomulaSimplificationsInter, 884 FormulaSimplificationTreeSizeReductionInter, 0.3s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.1s SsaConstructionTime, 0.5s SatisfiabilityAnalysisTime, 15.5s InterpolantComputationTime, 1223 NumberOfCodeBlocks, 1160 NumberOfCodeBlocksAsserted, 27 NumberOfCheckSat, 1798 ConstructedInterpolants, 0 QuantifiedInterpolants, 506805 SizeOfPredicates, 51 NumberOfNonLiveVariables, 1397 ConjunctsInSsa, 163 ConjunctsInUnsatCore, 26 InterpolantComputations, 2 PerfectInterpolantSequences, 6427/10296 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 correct! Received shutdown request...