./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/recursive-simple/fibo_2calls_4-1.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version a4ecdabc Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud-vcloud-master/worker/run_dir_b4153374-b365-4410-addc-7af735774528/bin/utaipan/data/config -Xmx15G -Xms4m -jar /tmp/vcloud-vcloud-master/worker/run_dir_b4153374-b365-4410-addc-7af735774528/bin/utaipan/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/run_dir_b4153374-b365-4410-addc-7af735774528/bin/utaipan/data -tc /tmp/vcloud-vcloud-master/worker/run_dir_b4153374-b365-4410-addc-7af735774528/bin/utaipan/config/TaipanReach.xml -i ../../sv-benchmarks/c/recursive-simple/fibo_2calls_4-1.c -s /tmp/vcloud-vcloud-master/worker/run_dir_b4153374-b365-4410-addc-7af735774528/bin/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/run_dir_b4153374-b365-4410-addc-7af735774528/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 0208408d43bfed3fb8998dae24b66601d82afc9c ............................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................. Execution finished normally Writing output log to file Ultimate.log Result: TRUE --- Real Ultimate output --- This is Ultimate 0.2.0-a4ecdab [2020-11-22 13:04:53,487 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-11-22 13:04:53,494 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-11-22 13:04:53,554 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-11-22 13:04:53,554 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-11-22 13:04:53,556 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-11-22 13:04:53,557 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-11-22 13:04:53,560 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-11-22 13:04:53,562 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-11-22 13:04:53,563 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-11-22 13:04:53,564 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-11-22 13:04:53,566 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-11-22 13:04:53,566 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-11-22 13:04:53,568 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-11-22 13:04:53,569 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-11-22 13:04:53,571 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-11-22 13:04:53,572 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-11-22 13:04:53,573 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-11-22 13:04:53,576 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-11-22 13:04:53,578 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-11-22 13:04:53,580 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-11-22 13:04:53,582 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-11-22 13:04:53,583 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-11-22 13:04:53,584 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-11-22 13:04:53,588 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-11-22 13:04:53,588 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-11-22 13:04:53,589 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-11-22 13:04:53,590 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-11-22 13:04:53,591 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-11-22 13:04:53,592 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-11-22 13:04:53,592 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-11-22 13:04:53,593 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-11-22 13:04:53,594 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-11-22 13:04:53,595 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-11-22 13:04:53,596 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-11-22 13:04:53,597 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-11-22 13:04:53,599 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-11-22 13:04:53,599 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-11-22 13:04:53,600 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-11-22 13:04:53,601 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-11-22 13:04:53,602 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-11-22 13:04:53,603 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud-vcloud-master/worker/run_dir_b4153374-b365-4410-addc-7af735774528/bin/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf [2020-11-22 13:04:53,644 INFO L113 SettingsManager]: Loading preferences was successful [2020-11-22 13:04:53,645 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-11-22 13:04:53,646 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2020-11-22 13:04:53,646 INFO L138 SettingsManager]: * User list type=DISABLED [2020-11-22 13:04:53,646 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2020-11-22 13:04:53,647 INFO L138 SettingsManager]: * Explicit value domain=true [2020-11-22 13:04:53,647 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2020-11-22 13:04:53,647 INFO L138 SettingsManager]: * Octagon Domain=false [2020-11-22 13:04:53,647 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2020-11-22 13:04:53,648 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2020-11-22 13:04:53,649 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2020-11-22 13:04:53,649 INFO L138 SettingsManager]: * Interval Domain=false [2020-11-22 13:04:53,649 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2020-11-22 13:04:53,649 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2020-11-22 13:04:53,650 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2020-11-22 13:04:53,650 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-11-22 13:04:53,651 INFO L138 SettingsManager]: * sizeof long=4 [2020-11-22 13:04:53,651 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-11-22 13:04:53,651 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-11-22 13:04:53,651 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-11-22 13:04:53,652 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-11-22 13:04:53,652 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-11-22 13:04:53,652 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-11-22 13:04:53,652 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2020-11-22 13:04:53,652 INFO L138 SettingsManager]: * sizeof long double=12 [2020-11-22 13:04:53,653 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-11-22 13:04:53,653 INFO L138 SettingsManager]: * Use constant arrays=true [2020-11-22 13:04:53,653 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-11-22 13:04:53,653 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-11-22 13:04:53,655 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-11-22 13:04:53,655 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-11-22 13:04:53,655 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-11-22 13:04:53,656 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-11-22 13:04:53,656 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-11-22 13:04:53,656 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-11-22 13:04:53,657 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2020-11-22 13:04:53,657 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-11-22 13:04:53,657 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-11-22 13:04:53,657 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-11-22 13:04:53,657 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2020-11-22 13:04:53,658 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_b4153374-b365-4410-addc-7af735774528/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud-vcloud-master/worker/run_dir_b4153374-b365-4410-addc-7af735774528/bin/utaipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 0208408d43bfed3fb8998dae24b66601d82afc9c [2020-11-22 13:04:53,913 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-11-22 13:04:53,957 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-11-22 13:04:53,960 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-11-22 13:04:53,961 INFO L271 PluginConnector]: Initializing CDTParser... [2020-11-22 13:04:53,962 INFO L275 PluginConnector]: CDTParser initialized [2020-11-22 13:04:53,963 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/run_dir_b4153374-b365-4410-addc-7af735774528/bin/utaipan/../../sv-benchmarks/c/recursive-simple/fibo_2calls_4-1.c [2020-11-22 13:04:54,041 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_b4153374-b365-4410-addc-7af735774528/bin/utaipan/data/5c3c654a4/8a74a5a2e115415c97a616afb1d7380c/FLAG1fc80e944 [2020-11-22 13:04:54,479 INFO L306 CDTParser]: Found 1 translation units. [2020-11-22 13:04:54,480 INFO L160 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/run_dir_b4153374-b365-4410-addc-7af735774528/sv-benchmarks/c/recursive-simple/fibo_2calls_4-1.c [2020-11-22 13:04:54,486 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_b4153374-b365-4410-addc-7af735774528/bin/utaipan/data/5c3c654a4/8a74a5a2e115415c97a616afb1d7380c/FLAG1fc80e944 [2020-11-22 13:04:54,885 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/run_dir_b4153374-b365-4410-addc-7af735774528/bin/utaipan/data/5c3c654a4/8a74a5a2e115415c97a616afb1d7380c [2020-11-22 13:04:54,887 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-11-22 13:04:54,889 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2020-11-22 13:04:54,891 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-11-22 13:04:54,891 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-11-22 13:04:54,894 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-11-22 13:04:54,895 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.11 01:04:54" (1/1) ... [2020-11-22 13:04:54,896 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@33d2b49b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:04:54, skipping insertion in model container [2020-11-22 13:04:54,897 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.11 01:04:54" (1/1) ... [2020-11-22 13:04:54,904 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-11-22 13:04:54,917 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-11-22 13:04:55,068 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-11-22 13:04:55,110 INFO L203 MainTranslator]: Completed pre-run [2020-11-22 13:04:55,126 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-11-22 13:04:55,139 INFO L208 MainTranslator]: Completed translation [2020-11-22 13:04:55,140 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:04:55 WrapperNode [2020-11-22 13:04:55,140 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-11-22 13:04:55,142 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2020-11-22 13:04:55,142 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2020-11-22 13:04:55,142 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2020-11-22 13:04:55,150 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:04:55" (1/1) ... [2020-11-22 13:04:55,156 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:04:55" (1/1) ... [2020-11-22 13:04:55,171 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2020-11-22 13:04:55,172 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-11-22 13:04:55,172 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-11-22 13:04:55,172 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-11-22 13:04:55,180 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:04:55" (1/1) ... [2020-11-22 13:04:55,180 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:04:55" (1/1) ... [2020-11-22 13:04:55,182 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:04:55" (1/1) ... [2020-11-22 13:04:55,182 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:04:55" (1/1) ... [2020-11-22 13:04:55,186 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:04:55" (1/1) ... [2020-11-22 13:04:55,188 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:04:55" (1/1) ... [2020-11-22 13:04:55,189 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:04:55" (1/1) ... [2020-11-22 13:04:55,190 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-11-22 13:04:55,191 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-11-22 13:04:55,192 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-11-22 13:04:55,192 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-11-22 13:04:55,193 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:04:55" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_b4153374-b365-4410-addc-7af735774528/bin/utaipan/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-11-22 13:04:55,270 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-11-22 13:04:55,271 INFO L130 BoogieDeclarations]: Found specification of procedure fibo2 [2020-11-22 13:04:55,271 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo2 [2020-11-22 13:04:55,271 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-11-22 13:04:55,271 INFO L130 BoogieDeclarations]: Found specification of procedure fibo1 [2020-11-22 13:04:55,271 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo1 [2020-11-22 13:04:55,272 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-11-22 13:04:55,272 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-11-22 13:04:55,589 INFO L293 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-11-22 13:04:55,589 INFO L298 CfgBuilder]: Removed 6 assume(true) statements. [2020-11-22 13:04:55,590 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.11 01:04:55 BoogieIcfgContainer [2020-11-22 13:04:55,590 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-11-22 13:04:55,591 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-11-22 13:04:55,592 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-11-22 13:04:55,595 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-11-22 13:04:55,595 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.11 01:04:54" (1/3) ... [2020-11-22 13:04:55,596 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@31e72bc0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.11 01:04:55, skipping insertion in model container [2020-11-22 13:04:55,596 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:04:55" (2/3) ... [2020-11-22 13:04:55,596 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@31e72bc0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.11 01:04:55, skipping insertion in model container [2020-11-22 13:04:55,596 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.11 01:04:55" (3/3) ... [2020-11-22 13:04:55,598 INFO L111 eAbstractionObserver]: Analyzing ICFG fibo_2calls_4-1.c [2020-11-22 13:04:55,607 INFO L164 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-11-22 13:04:55,610 INFO L176 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-11-22 13:04:55,619 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-11-22 13:04:55,642 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-11-22 13:04:55,642 INFO L378 AbstractCegarLoop]: Hoare is true [2020-11-22 13:04:55,642 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-11-22 13:04:55,642 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-11-22 13:04:55,642 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-11-22 13:04:55,643 INFO L382 AbstractCegarLoop]: Difference is false [2020-11-22 13:04:55,643 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-11-22 13:04:55,643 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-11-22 13:04:55,657 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states. [2020-11-22 13:04:55,662 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2020-11-22 13:04:55,662 INFO L414 BasicCegarLoop]: Found error trace [2020-11-22 13:04:55,663 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-22 13:04:55,663 INFO L429 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-22 13:04:55,669 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-22 13:04:55,669 INFO L82 PathProgramCache]: Analyzing trace with hash 1315362186, now seen corresponding path program 1 times [2020-11-22 13:04:55,678 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-22 13:04:55,679 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1517095556] [2020-11-22 13:04:55,679 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-22 13:04:55,781 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-22 13:04:55,886 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-22 13:04:55,887 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1517095556] [2020-11-22 13:04:55,887 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-22 13:04:55,888 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-11-22 13:04:55,888 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [347281501] [2020-11-22 13:04:55,891 INFO L461 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-11-22 13:04:55,891 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-22 13:04:55,907 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-11-22 13:04:55,908 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-11-22 13:04:55,910 INFO L87 Difference]: Start difference. First operand 26 states. Second operand 5 states. [2020-11-22 13:04:56,018 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-22 13:04:56,018 INFO L93 Difference]: Finished difference Result 34 states and 43 transitions. [2020-11-22 13:04:56,019 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-11-22 13:04:56,020 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 9 [2020-11-22 13:04:56,021 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-22 13:04:56,049 INFO L225 Difference]: With dead ends: 34 [2020-11-22 13:04:56,049 INFO L226 Difference]: Without dead ends: 26 [2020-11-22 13:04:56,052 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-11-22 13:04:56,070 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-11-22 13:04:56,097 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2020-11-22 13:04:56,098 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-11-22 13:04:56,101 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 33 transitions. [2020-11-22 13:04:56,102 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 33 transitions. Word has length 9 [2020-11-22 13:04:56,102 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-22 13:04:56,103 INFO L481 AbstractCegarLoop]: Abstraction has 26 states and 33 transitions. [2020-11-22 13:04:56,103 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-11-22 13:04:56,103 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 33 transitions. [2020-11-22 13:04:56,105 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-11-22 13:04:56,105 INFO L414 BasicCegarLoop]: Found error trace [2020-11-22 13:04:56,105 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-22 13:04:56,105 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-11-22 13:04:56,106 INFO L429 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-22 13:04:56,109 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-22 13:04:56,109 INFO L82 PathProgramCache]: Analyzing trace with hash -1458225802, now seen corresponding path program 1 times [2020-11-22 13:04:56,109 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-22 13:04:56,110 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [196962777] [2020-11-22 13:04:56,110 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-22 13:04:56,147 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-22 13:04:56,199 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-22 13:04:56,200 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [196962777] [2020-11-22 13:04:56,200 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-22 13:04:56,200 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-11-22 13:04:56,200 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [992006262] [2020-11-22 13:04:56,201 INFO L461 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-11-22 13:04:56,201 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-22 13:04:56,202 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-11-22 13:04:56,202 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-11-22 13:04:56,203 INFO L87 Difference]: Start difference. First operand 26 states and 33 transitions. Second operand 5 states. [2020-11-22 13:04:56,301 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-22 13:04:56,301 INFO L93 Difference]: Finished difference Result 32 states and 40 transitions. [2020-11-22 13:04:56,303 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-11-22 13:04:56,303 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 10 [2020-11-22 13:04:56,304 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-22 13:04:56,305 INFO L225 Difference]: With dead ends: 32 [2020-11-22 13:04:56,305 INFO L226 Difference]: Without dead ends: 28 [2020-11-22 13:04:56,306 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-11-22 13:04:56,306 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-11-22 13:04:56,315 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 26. [2020-11-22 13:04:56,315 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-11-22 13:04:56,319 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 33 transitions. [2020-11-22 13:04:56,319 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 33 transitions. Word has length 10 [2020-11-22 13:04:56,319 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-22 13:04:56,320 INFO L481 AbstractCegarLoop]: Abstraction has 26 states and 33 transitions. [2020-11-22 13:04:56,320 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-11-22 13:04:56,320 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 33 transitions. [2020-11-22 13:04:56,322 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-11-22 13:04:56,323 INFO L414 BasicCegarLoop]: Found error trace [2020-11-22 13:04:56,323 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-22 13:04:56,324 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-11-22 13:04:56,325 INFO L429 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-22 13:04:56,327 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-22 13:04:56,330 INFO L82 PathProgramCache]: Analyzing trace with hash -2038826467, now seen corresponding path program 1 times [2020-11-22 13:04:56,331 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-22 13:04:56,331 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [299077178] [2020-11-22 13:04:56,332 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-22 13:04:56,368 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-22 13:04:56,450 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-11-22 13:04:56,450 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [299077178] [2020-11-22 13:04:56,450 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1153813106] [2020-11-22 13:04:56,451 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_b4153374-b365-4410-addc-7af735774528/bin/utaipan/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-22 13:04:56,537 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-22 13:04:56,539 INFO L263 TraceCheckSpWp]: Trace formula consists of 80 conjuncts, 6 conjunts are in the unsatisfiable core [2020-11-22 13:04:56,544 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-22 13:04:56,679 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-11-22 13:04:56,679 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-11-22 13:04:56,955 INFO L603 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-11-22 13:04:57,019 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-11-22 13:04:57,019 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1430563827] [2020-11-22 13:04:57,041 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2020-11-22 13:04:57,041 INFO L166 IcfgInterpreter]: Building call graph [2020-11-22 13:04:57,046 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-11-22 13:04:57,051 INFO L176 IcfgInterpreter]: Starting interpretation [2020-11-22 13:04:57,052 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-11-22 13:04:57,329 FATAL L? ?]: Ignoring exception! java.util.ConcurrentModificationException at java.base/java.util.HashMap.computeIfAbsent(HashMap.java:1134) at de.uni_freiburg.informatik.ultimate.lib.sifa.summarizers.TopInputCallSummarizer.summarize(TopInputCallSummarizer.java:67) at de.uni_freiburg.informatik.ultimate.lib.sifa.DagInterpreter.ipretCallReturnSummary(DagInterpreter.java:220) at de.uni_freiburg.informatik.ultimate.lib.sifa.DagInterpreter.ipretTransAndStoreLoiPred(DagInterpreter.java:207) at de.uni_freiburg.informatik.ultimate.lib.sifa.DagInterpreter.ipretTrans(DagInterpreter.java:187) at de.uni_freiburg.informatik.ultimate.lib.sifa.DagInterpreter.ipretNode(DagInterpreter.java:165) at de.uni_freiburg.informatik.ultimate.lib.sifa.DagInterpreter.interpret(DagInterpreter.java:123) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.interpretLoisInProcedure(IcfgInterpreter.java:136) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.interpret(IcfgInterpreter.java:127) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:102) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:289) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:189) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:179) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:84) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:74) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:511) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterateInternal(AbstractCegarLoop.java:438) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:372) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopResult.iterate(CegarLoopResult.java:142) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.iterateNew(TraceAbstractionStarter.java:341) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:182) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:134) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2020-11-22 13:04:57,331 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-11-22 13:04:57,332 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7, 7] total 12 [2020-11-22 13:04:57,332 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [923570143] [2020-11-22 13:04:57,332 INFO L461 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-11-22 13:04:57,333 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-22 13:04:57,333 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-11-22 13:04:57,334 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=104, Unknown=0, NotChecked=0, Total=132 [2020-11-22 13:04:57,334 INFO L87 Difference]: Start difference. First operand 26 states and 33 transitions. Second operand 12 states. [2020-11-22 13:04:57,620 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-22 13:04:57,620 INFO L93 Difference]: Finished difference Result 54 states and 74 transitions. [2020-11-22 13:04:57,620 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-11-22 13:04:57,621 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 22 [2020-11-22 13:04:57,621 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-22 13:04:57,622 INFO L225 Difference]: With dead ends: 54 [2020-11-22 13:04:57,622 INFO L226 Difference]: Without dead ends: 30 [2020-11-22 13:04:57,623 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 33 SyntacticMatches, 5 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=58, Invalid=214, Unknown=0, NotChecked=0, Total=272 [2020-11-22 13:04:57,624 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-11-22 13:04:57,629 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 28. [2020-11-22 13:04:57,629 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-11-22 13:04:57,630 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 35 transitions. [2020-11-22 13:04:57,630 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 35 transitions. Word has length 22 [2020-11-22 13:04:57,630 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-22 13:04:57,631 INFO L481 AbstractCegarLoop]: Abstraction has 28 states and 35 transitions. [2020-11-22 13:04:57,631 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-11-22 13:04:57,631 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 35 transitions. [2020-11-22 13:04:57,634 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-11-22 13:04:57,634 INFO L414 BasicCegarLoop]: Found error trace [2020-11-22 13:04:57,635 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-22 13:04:57,858 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2020-11-22 13:04:57,859 INFO L429 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-22 13:04:57,859 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-22 13:04:57,859 INFO L82 PathProgramCache]: Analyzing trace with hash 1495076739, now seen corresponding path program 1 times [2020-11-22 13:04:57,860 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-22 13:04:57,860 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [742971573] [2020-11-22 13:04:57,860 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-22 13:04:57,882 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-22 13:04:57,953 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-11-22 13:04:57,954 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [742971573] [2020-11-22 13:04:57,954 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [940526729] [2020-11-22 13:04:57,954 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_b4153374-b365-4410-addc-7af735774528/bin/utaipan/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-22 13:04:57,996 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-22 13:04:57,997 INFO L263 TraceCheckSpWp]: Trace formula consists of 82 conjuncts, 6 conjunts are in the unsatisfiable core [2020-11-22 13:04:57,998 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-22 13:04:58,040 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-11-22 13:04:58,040 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-11-22 13:04:58,335 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-11-22 13:04:58,336 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [552676126] [2020-11-22 13:04:58,339 INFO L159 IcfgInterpreter]: Started Sifa with 20 locations of interest [2020-11-22 13:04:58,339 INFO L166 IcfgInterpreter]: Building call graph [2020-11-22 13:04:58,340 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-11-22 13:04:58,340 INFO L176 IcfgInterpreter]: Starting interpretation [2020-11-22 13:04:58,340 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-11-22 13:04:58,568 FATAL L? ?]: Ignoring exception! java.util.ConcurrentModificationException at java.base/java.util.HashMap.computeIfAbsent(HashMap.java:1134) at de.uni_freiburg.informatik.ultimate.lib.sifa.summarizers.TopInputCallSummarizer.summarize(TopInputCallSummarizer.java:67) at de.uni_freiburg.informatik.ultimate.lib.sifa.DagInterpreter.ipretCallReturnSummary(DagInterpreter.java:220) at de.uni_freiburg.informatik.ultimate.lib.sifa.DagInterpreter.ipretTransAndStoreLoiPred(DagInterpreter.java:207) at de.uni_freiburg.informatik.ultimate.lib.sifa.DagInterpreter.ipretTrans(DagInterpreter.java:187) at de.uni_freiburg.informatik.ultimate.lib.sifa.DagInterpreter.ipretNode(DagInterpreter.java:165) at de.uni_freiburg.informatik.ultimate.lib.sifa.DagInterpreter.interpret(DagInterpreter.java:123) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.interpretLoisInProcedure(IcfgInterpreter.java:136) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.interpret(IcfgInterpreter.java:127) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:102) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:289) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:189) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:179) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:84) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:74) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:511) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterateInternal(AbstractCegarLoop.java:438) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:372) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopResult.iterate(CegarLoopResult.java:142) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.iterateNew(TraceAbstractionStarter.java:341) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:182) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:134) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2020-11-22 13:04:58,570 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-11-22 13:04:58,570 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 10 [2020-11-22 13:04:58,570 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [315023474] [2020-11-22 13:04:58,571 INFO L461 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-11-22 13:04:58,571 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-22 13:04:58,572 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-11-22 13:04:58,572 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2020-11-22 13:04:58,572 INFO L87 Difference]: Start difference. First operand 28 states and 35 transitions. Second operand 10 states. [2020-11-22 13:04:58,777 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-22 13:04:58,777 INFO L93 Difference]: Finished difference Result 39 states and 51 transitions. [2020-11-22 13:04:58,779 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-11-22 13:04:58,780 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 23 [2020-11-22 13:04:58,780 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-22 13:04:58,781 INFO L225 Difference]: With dead ends: 39 [2020-11-22 13:04:58,782 INFO L226 Difference]: Without dead ends: 35 [2020-11-22 13:04:58,782 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 42 SyntacticMatches, 2 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=32, Invalid=100, Unknown=0, NotChecked=0, Total=132 [2020-11-22 13:04:58,783 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2020-11-22 13:04:58,795 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 33. [2020-11-22 13:04:58,795 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-11-22 13:04:58,799 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 44 transitions. [2020-11-22 13:04:58,800 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 44 transitions. Word has length 23 [2020-11-22 13:04:58,800 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-22 13:04:58,800 INFO L481 AbstractCegarLoop]: Abstraction has 33 states and 44 transitions. [2020-11-22 13:04:58,800 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-11-22 13:04:58,800 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 44 transitions. [2020-11-22 13:04:58,802 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2020-11-22 13:04:58,802 INFO L414 BasicCegarLoop]: Found error trace [2020-11-22 13:04:58,802 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-22 13:04:59,024 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2020-11-22 13:04:59,024 INFO L429 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-22 13:04:59,024 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-22 13:04:59,024 INFO L82 PathProgramCache]: Analyzing trace with hash -1338050228, now seen corresponding path program 1 times [2020-11-22 13:04:59,024 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-22 13:04:59,025 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1824964704] [2020-11-22 13:04:59,025 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-22 13:04:59,039 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-22 13:04:59,081 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 5 proven. 5 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2020-11-22 13:04:59,082 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1824964704] [2020-11-22 13:04:59,082 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [621012568] [2020-11-22 13:04:59,082 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_b4153374-b365-4410-addc-7af735774528/bin/utaipan/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-22 13:04:59,153 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-22 13:04:59,155 INFO L263 TraceCheckSpWp]: Trace formula consists of 109 conjuncts, 8 conjunts are in the unsatisfiable core [2020-11-22 13:04:59,159 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-22 13:04:59,250 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-11-22 13:04:59,250 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-11-22 13:04:59,690 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 2 proven. 10 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-11-22 13:04:59,691 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [114392252] [2020-11-22 13:04:59,695 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2020-11-22 13:04:59,695 INFO L166 IcfgInterpreter]: Building call graph [2020-11-22 13:04:59,696 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:289) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:189) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:179) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:84) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:74) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:511) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterateInternal(AbstractCegarLoop.java:438) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:372) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopResult.iterate(CegarLoopResult.java:142) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.iterateNew(TraceAbstractionStarter.java:341) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:182) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:134) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2020-11-22 13:04:59,696 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-11-22 13:04:59,696 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 8, 9] total 14 [2020-11-22 13:04:59,696 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1983949752] [2020-11-22 13:04:59,697 INFO L461 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-11-22 13:04:59,697 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-22 13:04:59,699 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-11-22 13:04:59,701 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2020-11-22 13:04:59,701 INFO L87 Difference]: Start difference. First operand 33 states and 44 transitions. Second operand 14 states. [2020-11-22 13:04:59,944 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-22 13:04:59,944 INFO L93 Difference]: Finished difference Result 66 states and 96 transitions. [2020-11-22 13:04:59,945 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-11-22 13:04:59,945 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 35 [2020-11-22 13:04:59,945 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-22 13:04:59,947 INFO L225 Difference]: With dead ends: 66 [2020-11-22 13:04:59,947 INFO L226 Difference]: Without dead ends: 35 [2020-11-22 13:04:59,948 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 58 SyntacticMatches, 7 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 45 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=75, Invalid=305, Unknown=0, NotChecked=0, Total=380 [2020-11-22 13:04:59,949 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2020-11-22 13:04:59,955 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2020-11-22 13:04:59,955 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-11-22 13:04:59,956 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 46 transitions. [2020-11-22 13:04:59,956 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 46 transitions. Word has length 35 [2020-11-22 13:04:59,956 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-22 13:04:59,956 INFO L481 AbstractCegarLoop]: Abstraction has 35 states and 46 transitions. [2020-11-22 13:04:59,957 INFO L482 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-11-22 13:04:59,957 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 46 transitions. [2020-11-22 13:04:59,958 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-11-22 13:04:59,958 INFO L414 BasicCegarLoop]: Found error trace [2020-11-22 13:04:59,958 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-22 13:05:00,184 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-22 13:05:00,184 INFO L429 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-22 13:05:00,185 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-22 13:05:00,185 INFO L82 PathProgramCache]: Analyzing trace with hash 2123237324, now seen corresponding path program 1 times [2020-11-22 13:05:00,185 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-22 13:05:00,186 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1566625909] [2020-11-22 13:05:00,186 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-22 13:05:00,196 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-22 13:05:00,319 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 4 proven. 3 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2020-11-22 13:05:00,319 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1566625909] [2020-11-22 13:05:00,320 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [560603958] [2020-11-22 13:05:00,320 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_b4153374-b365-4410-addc-7af735774528/bin/utaipan/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-22 13:05:00,380 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-22 13:05:00,381 INFO L263 TraceCheckSpWp]: Trace formula consists of 111 conjuncts, 8 conjunts are in the unsatisfiable core [2020-11-22 13:05:00,391 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-22 13:05:00,518 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2020-11-22 13:05:00,519 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-11-22 13:05:00,925 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 2 proven. 11 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-11-22 13:05:00,925 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [661879823] [2020-11-22 13:05:00,928 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2020-11-22 13:05:00,928 INFO L166 IcfgInterpreter]: Building call graph [2020-11-22 13:05:00,929 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:289) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:189) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:179) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:84) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:74) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:511) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterateInternal(AbstractCegarLoop.java:438) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:372) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopResult.iterate(CegarLoopResult.java:142) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.iterateNew(TraceAbstractionStarter.java:341) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:182) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:134) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2020-11-22 13:05:00,930 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-11-22 13:05:00,930 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 9] total 16 [2020-11-22 13:05:00,930 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1103948117] [2020-11-22 13:05:00,931 INFO L461 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-11-22 13:05:00,932 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-22 13:05:00,933 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-11-22 13:05:00,933 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=199, Unknown=0, NotChecked=0, Total=240 [2020-11-22 13:05:00,934 INFO L87 Difference]: Start difference. First operand 35 states and 46 transitions. Second operand 16 states. [2020-11-22 13:05:01,585 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-22 13:05:01,585 INFO L93 Difference]: Finished difference Result 98 states and 158 transitions. [2020-11-22 13:05:01,586 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-11-22 13:05:01,586 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 36 [2020-11-22 13:05:01,586 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-22 13:05:01,595 INFO L225 Difference]: With dead ends: 98 [2020-11-22 13:05:01,595 INFO L226 Difference]: Without dead ends: 65 [2020-11-22 13:05:01,597 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 67 SyntacticMatches, 5 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=132, Invalid=570, Unknown=0, NotChecked=0, Total=702 [2020-11-22 13:05:01,597 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2020-11-22 13:05:01,611 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 56. [2020-11-22 13:05:01,615 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-11-22 13:05:01,617 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 86 transitions. [2020-11-22 13:05:01,620 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 86 transitions. Word has length 36 [2020-11-22 13:05:01,621 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-22 13:05:01,621 INFO L481 AbstractCegarLoop]: Abstraction has 56 states and 86 transitions. [2020-11-22 13:05:01,621 INFO L482 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-11-22 13:05:01,621 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 86 transitions. [2020-11-22 13:05:01,624 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2020-11-22 13:05:01,625 INFO L414 BasicCegarLoop]: Found error trace [2020-11-22 13:05:01,628 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-22 13:05:01,836 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-22 13:05:01,837 INFO L429 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-22 13:05:01,837 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-22 13:05:01,837 INFO L82 PathProgramCache]: Analyzing trace with hash -1284483151, now seen corresponding path program 1 times [2020-11-22 13:05:01,837 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-22 13:05:01,838 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1597962325] [2020-11-22 13:05:01,838 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-22 13:05:01,855 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-22 13:05:01,910 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 12 proven. 12 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2020-11-22 13:05:01,910 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1597962325] [2020-11-22 13:05:01,911 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [893698867] [2020-11-22 13:05:01,911 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_b4153374-b365-4410-addc-7af735774528/bin/utaipan/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-22 13:05:01,986 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-22 13:05:01,988 INFO L263 TraceCheckSpWp]: Trace formula consists of 142 conjuncts, 8 conjunts are in the unsatisfiable core [2020-11-22 13:05:01,990 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-22 13:05:02,021 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 12 proven. 12 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2020-11-22 13:05:02,021 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-11-22 13:05:02,487 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 12 proven. 13 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2020-11-22 13:05:02,488 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [787325393] [2020-11-22 13:05:02,490 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2020-11-22 13:05:02,490 INFO L166 IcfgInterpreter]: Building call graph [2020-11-22 13:05:02,491 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:289) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:189) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:179) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:84) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:74) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:511) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterateInternal(AbstractCegarLoop.java:438) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:372) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopResult.iterate(CegarLoopResult.java:142) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.iterateNew(TraceAbstractionStarter.java:341) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:182) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:134) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2020-11-22 13:05:02,491 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-11-22 13:05:02,491 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 9] total 11 [2020-11-22 13:05:02,491 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [309223517] [2020-11-22 13:05:02,492 INFO L461 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-11-22 13:05:02,492 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-22 13:05:02,492 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-11-22 13:05:02,493 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2020-11-22 13:05:02,493 INFO L87 Difference]: Start difference. First operand 56 states and 86 transitions. Second operand 11 states. [2020-11-22 13:05:02,681 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-22 13:05:02,681 INFO L93 Difference]: Finished difference Result 81 states and 140 transitions. [2020-11-22 13:05:02,682 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-11-22 13:05:02,682 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 50 [2020-11-22 13:05:02,683 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-22 13:05:02,684 INFO L225 Difference]: With dead ends: 81 [2020-11-22 13:05:02,685 INFO L226 Difference]: Without dead ends: 77 [2020-11-22 13:05:02,685 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 113 GetRequests, 94 SyntacticMatches, 7 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=46, Invalid=136, Unknown=0, NotChecked=0, Total=182 [2020-11-22 13:05:02,686 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2020-11-22 13:05:02,700 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 56. [2020-11-22 13:05:02,700 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-11-22 13:05:02,702 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 86 transitions. [2020-11-22 13:05:02,702 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 86 transitions. Word has length 50 [2020-11-22 13:05:02,702 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-22 13:05:02,703 INFO L481 AbstractCegarLoop]: Abstraction has 56 states and 86 transitions. [2020-11-22 13:05:02,703 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-11-22 13:05:02,703 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 86 transitions. [2020-11-22 13:05:02,706 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2020-11-22 13:05:02,706 INFO L414 BasicCegarLoop]: Found error trace [2020-11-22 13:05:02,706 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-22 13:05:02,932 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable32 [2020-11-22 13:05:02,932 INFO L429 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-22 13:05:02,933 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-22 13:05:02,933 INFO L82 PathProgramCache]: Analyzing trace with hash -1330269847, now seen corresponding path program 1 times [2020-11-22 13:05:02,933 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-22 13:05:02,933 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1555778708] [2020-11-22 13:05:02,933 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-22 13:05:02,959 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-22 13:05:03,048 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 18 proven. 5 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2020-11-22 13:05:03,048 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1555778708] [2020-11-22 13:05:03,049 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [353019642] [2020-11-22 13:05:03,049 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_b4153374-b365-4410-addc-7af735774528/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 [2020-11-22 13:05:03,099 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-22 13:05:03,106 INFO L263 TraceCheckSpWp]: Trace formula consists of 144 conjuncts, 6 conjunts are in the unsatisfiable core [2020-11-22 13:05:03,113 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-22 13:05:03,147 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 18 proven. 5 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2020-11-22 13:05:03,147 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-11-22 13:05:03,426 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 18 proven. 5 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2020-11-22 13:05:03,426 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1341370008] [2020-11-22 13:05:03,429 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2020-11-22 13:05:03,429 INFO L166 IcfgInterpreter]: Building call graph [2020-11-22 13:05:03,430 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:289) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:189) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:179) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:84) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:74) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:511) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterateInternal(AbstractCegarLoop.java:438) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:372) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopResult.iterate(CegarLoopResult.java:142) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.iterateNew(TraceAbstractionStarter.java:341) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:182) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:134) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2020-11-22 13:05:03,430 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-11-22 13:05:03,430 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 9 [2020-11-22 13:05:03,430 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2016916659] [2020-11-22 13:05:03,431 INFO L461 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-11-22 13:05:03,431 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-22 13:05:03,431 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-11-22 13:05:03,432 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2020-11-22 13:05:03,432 INFO L87 Difference]: Start difference. First operand 56 states and 86 transitions. Second operand 9 states. [2020-11-22 13:05:03,572 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-22 13:05:03,573 INFO L93 Difference]: Finished difference Result 69 states and 101 transitions. [2020-11-22 13:05:03,574 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-11-22 13:05:03,574 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 51 [2020-11-22 13:05:03,574 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-22 13:05:03,576 INFO L225 Difference]: With dead ends: 69 [2020-11-22 13:05:03,576 INFO L226 Difference]: Without dead ends: 65 [2020-11-22 13:05:03,577 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 97 SyntacticMatches, 4 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=29, Invalid=81, Unknown=0, NotChecked=0, Total=110 [2020-11-22 13:05:03,577 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2020-11-22 13:05:03,595 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 56. [2020-11-22 13:05:03,595 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-11-22 13:05:03,600 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 86 transitions. [2020-11-22 13:05:03,600 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 86 transitions. Word has length 51 [2020-11-22 13:05:03,603 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-22 13:05:03,603 INFO L481 AbstractCegarLoop]: Abstraction has 56 states and 86 transitions. [2020-11-22 13:05:03,604 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-11-22 13:05:03,604 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 86 transitions. [2020-11-22 13:05:03,617 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2020-11-22 13:05:03,622 INFO L414 BasicCegarLoop]: Found error trace [2020-11-22 13:05:03,622 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-22 13:05:03,848 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-22 13:05:03,849 INFO L429 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-22 13:05:03,849 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-22 13:05:03,849 INFO L82 PathProgramCache]: Analyzing trace with hash -505224196, now seen corresponding path program 1 times [2020-11-22 13:05:03,849 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-22 13:05:03,849 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [885455414] [2020-11-22 13:05:03,849 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-22 13:05:03,877 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-22 13:05:04,176 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 53 trivial. 0 not checked. [2020-11-22 13:05:04,177 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [885455414] [2020-11-22 13:05:04,177 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1565292433] [2020-11-22 13:05:04,177 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_b4153374-b365-4410-addc-7af735774528/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 [2020-11-22 13:05:04,237 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-22 13:05:04,238 INFO L263 TraceCheckSpWp]: Trace formula consists of 173 conjuncts, 39 conjunts are in the unsatisfiable core [2020-11-22 13:05:04,241 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-22 13:05:04,409 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 53 trivial. 0 not checked. [2020-11-22 13:05:04,409 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-11-22 13:05:05,090 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 53 trivial. 0 not checked. [2020-11-22 13:05:05,091 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1315991908] [2020-11-22 13:05:05,095 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2020-11-22 13:05:05,095 INFO L166 IcfgInterpreter]: Building call graph [2020-11-22 13:05:05,096 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:289) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:189) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:179) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:84) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:74) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:511) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterateInternal(AbstractCegarLoop.java:438) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:372) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopResult.iterate(CegarLoopResult.java:142) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.iterateNew(TraceAbstractionStarter.java:341) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:182) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:134) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2020-11-22 13:05:05,097 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-11-22 13:05:05,097 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 21 [2020-11-22 13:05:05,100 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [780982806] [2020-11-22 13:05:05,103 INFO L461 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-11-22 13:05:05,103 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-22 13:05:05,103 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-11-22 13:05:05,103 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=373, Unknown=0, NotChecked=0, Total=420 [2020-11-22 13:05:05,103 INFO L87 Difference]: Start difference. First operand 56 states and 86 transitions. Second operand 21 states. [2020-11-22 13:05:05,362 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-22 13:05:05,362 INFO L93 Difference]: Finished difference Result 105 states and 193 transitions. [2020-11-22 13:05:05,363 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-11-22 13:05:05,363 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 64 [2020-11-22 13:05:05,363 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-22 13:05:05,365 INFO L225 Difference]: With dead ends: 105 [2020-11-22 13:05:05,365 INFO L226 Difference]: Without dead ends: 101 [2020-11-22 13:05:05,366 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 148 GetRequests, 111 SyntacticMatches, 17 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 73 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=51, Invalid=411, Unknown=0, NotChecked=0, Total=462 [2020-11-22 13:05:05,367 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 101 states. [2020-11-22 13:05:05,387 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 101 to 69. [2020-11-22 13:05:05,387 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 69 states. [2020-11-22 13:05:05,389 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 122 transitions. [2020-11-22 13:05:05,390 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 122 transitions. Word has length 64 [2020-11-22 13:05:05,390 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-22 13:05:05,390 INFO L481 AbstractCegarLoop]: Abstraction has 69 states and 122 transitions. [2020-11-22 13:05:05,390 INFO L482 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-11-22 13:05:05,390 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 122 transitions. [2020-11-22 13:05:05,393 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2020-11-22 13:05:05,393 INFO L414 BasicCegarLoop]: Found error trace [2020-11-22 13:05:05,393 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 5, 5, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2020-11-22 13:05:05,604 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-22 13:05:05,605 INFO L429 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-22 13:05:05,605 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-22 13:05:05,605 INFO L82 PathProgramCache]: Analyzing trace with hash -2062173009, now seen corresponding path program 2 times [2020-11-22 13:05:05,605 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-22 13:05:05,605 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [668440726] [2020-11-22 13:05:05,606 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-22 13:05:05,647 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-22 13:05:05,804 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 43 proven. 20 refuted. 0 times theorem prover too weak. 73 trivial. 0 not checked. [2020-11-22 13:05:05,804 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [668440726] [2020-11-22 13:05:05,804 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [769775920] [2020-11-22 13:05:05,804 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_b4153374-b365-4410-addc-7af735774528/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 [2020-11-22 13:05:05,868 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2020-11-22 13:05:05,868 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-11-22 13:05:05,869 INFO L263 TraceCheckSpWp]: Trace formula consists of 145 conjuncts, 8 conjunts are in the unsatisfiable core [2020-11-22 13:05:05,872 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-22 13:05:05,931 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 43 proven. 15 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2020-11-22 13:05:05,932 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-11-22 13:05:06,511 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 43 proven. 16 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2020-11-22 13:05:06,511 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1828086445] [2020-11-22 13:05:06,514 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2020-11-22 13:05:06,514 INFO L166 IcfgInterpreter]: Building call graph [2020-11-22 13:05:06,515 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:289) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:189) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:179) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:84) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:74) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:511) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterateInternal(AbstractCegarLoop.java:438) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:372) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopResult.iterate(CegarLoopResult.java:142) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.iterateNew(TraceAbstractionStarter.java:341) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:182) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:134) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2020-11-22 13:05:06,516 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-11-22 13:05:06,516 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 8, 9] total 14 [2020-11-22 13:05:06,516 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [157836572] [2020-11-22 13:05:06,517 INFO L461 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-11-22 13:05:06,517 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-22 13:05:06,517 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-11-22 13:05:06,518 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=142, Unknown=0, NotChecked=0, Total=182 [2020-11-22 13:05:06,518 INFO L87 Difference]: Start difference. First operand 69 states and 122 transitions. Second operand 14 states. [2020-11-22 13:05:06,738 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-22 13:05:06,738 INFO L93 Difference]: Finished difference Result 87 states and 151 transitions. [2020-11-22 13:05:06,739 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-11-22 13:05:06,739 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 79 [2020-11-22 13:05:06,739 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-22 13:05:06,741 INFO L225 Difference]: With dead ends: 87 [2020-11-22 13:05:06,741 INFO L226 Difference]: Without dead ends: 83 [2020-11-22 13:05:06,742 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 170 GetRequests, 149 SyntacticMatches, 5 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=75, Invalid=231, Unknown=0, NotChecked=0, Total=306 [2020-11-22 13:05:06,742 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2020-11-22 13:05:06,763 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 63. [2020-11-22 13:05:06,763 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2020-11-22 13:05:06,765 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 105 transitions. [2020-11-22 13:05:06,765 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 105 transitions. Word has length 79 [2020-11-22 13:05:06,765 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-22 13:05:06,766 INFO L481 AbstractCegarLoop]: Abstraction has 63 states and 105 transitions. [2020-11-22 13:05:06,766 INFO L482 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-11-22 13:05:06,766 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 105 transitions. [2020-11-22 13:05:06,767 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2020-11-22 13:05:06,767 INFO L414 BasicCegarLoop]: Found error trace [2020-11-22 13:05:06,768 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2020-11-22 13:05:06,968 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable35 [2020-11-22 13:05:06,971 INFO L429 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-22 13:05:06,971 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-22 13:05:06,971 INFO L82 PathProgramCache]: Analyzing trace with hash -2002915336, now seen corresponding path program 1 times [2020-11-22 13:05:06,972 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-22 13:05:06,972 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1213590966] [2020-11-22 13:05:06,972 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-22 13:05:06,995 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-22 13:05:07,116 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 17 proven. 33 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2020-11-22 13:05:07,116 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1213590966] [2020-11-22 13:05:07,116 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1740739824] [2020-11-22 13:05:07,116 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_b4153374-b365-4410-addc-7af735774528/bin/utaipan/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-22 13:05:07,203 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-22 13:05:07,204 INFO L263 TraceCheckSpWp]: Trace formula consists of 175 conjuncts, 10 conjunts are in the unsatisfiable core [2020-11-22 13:05:07,209 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-22 13:05:07,250 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 17 proven. 33 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2020-11-22 13:05:07,250 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-11-22 13:05:07,948 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 19 proven. 35 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2020-11-22 13:05:07,949 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1011623053] [2020-11-22 13:05:07,952 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2020-11-22 13:05:07,953 INFO L166 IcfgInterpreter]: Building call graph [2020-11-22 13:05:07,953 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:289) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:189) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:179) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:84) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:74) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:511) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterateInternal(AbstractCegarLoop.java:438) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:372) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopResult.iterate(CegarLoopResult.java:142) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.iterateNew(TraceAbstractionStarter.java:341) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:182) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:134) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2020-11-22 13:05:07,954 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-11-22 13:05:07,955 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 11] total 13 [2020-11-22 13:05:07,955 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1039212091] [2020-11-22 13:05:07,957 INFO L461 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-11-22 13:05:07,957 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-22 13:05:07,957 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-11-22 13:05:07,958 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=121, Unknown=0, NotChecked=0, Total=156 [2020-11-22 13:05:07,958 INFO L87 Difference]: Start difference. First operand 63 states and 105 transitions. Second operand 13 states. [2020-11-22 13:05:08,187 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-22 13:05:08,187 INFO L93 Difference]: Finished difference Result 79 states and 139 transitions. [2020-11-22 13:05:08,188 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-11-22 13:05:08,188 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 65 [2020-11-22 13:05:08,188 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-22 13:05:08,188 INFO L225 Difference]: With dead ends: 79 [2020-11-22 13:05:08,188 INFO L226 Difference]: Without dead ends: 0 [2020-11-22 13:05:08,189 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 145 GetRequests, 122 SyntacticMatches, 8 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=63, Invalid=209, Unknown=0, NotChecked=0, Total=272 [2020-11-22 13:05:08,190 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-11-22 13:05:08,190 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-11-22 13:05:08,190 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-11-22 13:05:08,190 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-11-22 13:05:08,190 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 65 [2020-11-22 13:05:08,190 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-22 13:05:08,190 INFO L481 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-11-22 13:05:08,190 INFO L482 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-11-22 13:05:08,190 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-11-22 13:05:08,190 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-11-22 13:05:08,391 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable36 [2020-11-22 13:05:08,392 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-11-22 13:05:08,712 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 40 DAG size of output: 24 [2020-11-22 13:05:08,727 INFO L274 CegarLoopResult]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2020-11-22 13:05:08,727 INFO L274 CegarLoopResult]: For program point ULTIMATE.startENTRY(line -1) no Hoare annotation was computed. [2020-11-22 13:05:08,728 INFO L274 CegarLoopResult]: For program point ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION(line 4) no Hoare annotation was computed. [2020-11-22 13:05:08,728 INFO L274 CegarLoopResult]: For program point L41(line 41) no Hoare annotation was computed. [2020-11-22 13:05:08,728 INFO L274 CegarLoopResult]: For program point L40(lines 40 42) no Hoare annotation was computed. [2020-11-22 13:05:08,728 INFO L270 CegarLoopResult]: At program point L39(line 39) the Hoare annotation is: (and (<= 4 ULTIMATE.start_main_~x~0) (<= ULTIMATE.start_main_~x~0 4)) [2020-11-22 13:05:08,728 INFO L274 CegarLoopResult]: For program point L39-1(line 39) no Hoare annotation was computed. [2020-11-22 13:05:08,728 INFO L270 CegarLoopResult]: At program point L40-2(lines 40 42) the Hoare annotation is: (<= 4 ULTIMATE.start_main_~x~0) [2020-11-22 13:05:08,728 INFO L277 CegarLoopResult]: At program point fibo2ENTRY(lines 19 27) the Hoare annotation is: true [2020-11-22 13:05:08,728 INFO L270 CegarLoopResult]: At program point L25(line 25) the Hoare annotation is: (and (<= |fibo2_#in~n| fibo2_~n) (<= 2 |fibo2_#in~n|) (<= fibo2_~n |fibo2_#in~n|)) [2020-11-22 13:05:08,728 INFO L274 CegarLoopResult]: For program point L25-1(line 25) no Hoare annotation was computed. [2020-11-22 13:05:08,728 INFO L270 CegarLoopResult]: At program point L25-2(line 25) the Hoare annotation is: (let ((.cse0 (<= |fibo2_#in~n| fibo2_~n)) (.cse1 (<= fibo2_~n |fibo2_#in~n|))) (or (and .cse0 (<= |fibo2_#t~ret9| 1) (<= 1 |fibo2_#t~ret9|) (<= 2 |fibo2_#in~n|) .cse1) (and (<= 4 |fibo2_#in~n|) .cse0 .cse1))) [2020-11-22 13:05:08,729 INFO L274 CegarLoopResult]: For program point L22(lines 22 26) no Hoare annotation was computed. [2020-11-22 13:05:08,729 INFO L274 CegarLoopResult]: For program point L25-3(line 25) no Hoare annotation was computed. [2020-11-22 13:05:08,729 INFO L274 CegarLoopResult]: For program point L20(lines 20 26) no Hoare annotation was computed. [2020-11-22 13:05:08,729 INFO L274 CegarLoopResult]: For program point fibo2FINAL(lines 19 27) no Hoare annotation was computed. [2020-11-22 13:05:08,729 INFO L274 CegarLoopResult]: For program point fibo2EXIT(lines 19 27) no Hoare annotation was computed. [2020-11-22 13:05:08,729 INFO L277 CegarLoopResult]: At program point fibo1ENTRY(lines 9 17) the Hoare annotation is: true [2020-11-22 13:05:08,729 INFO L270 CegarLoopResult]: At program point L15(line 15) the Hoare annotation is: (and (<= |fibo1_#in~n| fibo1_~n) (<= 2 |fibo1_#in~n|) (<= fibo1_~n |fibo1_#in~n|)) [2020-11-22 13:05:08,729 INFO L274 CegarLoopResult]: For program point L15-1(line 15) no Hoare annotation was computed. [2020-11-22 13:05:08,729 INFO L270 CegarLoopResult]: At program point L15-2(line 15) the Hoare annotation is: (let ((.cse1 (<= |fibo1_#in~n| fibo1_~n)) (.cse2 (<= fibo1_~n |fibo1_#in~n|))) (or (and (let ((.cse0 (<= 3 fibo1_~n))) (or (and (<= |fibo1_#in~n| 3) .cse0) (and .cse0 .cse1 (<= |fibo1_#t~ret7| 2) (<= 2 |fibo1_#t~ret7|)))) .cse2) (and (<= |fibo1_#in~n| 2) (< 1 fibo1_~n) .cse2 (= |fibo1_#t~ret7| 1)) (and (<= 5 |fibo1_#in~n|) .cse1 .cse2))) [2020-11-22 13:05:08,729 INFO L274 CegarLoopResult]: For program point L12(lines 12 16) no Hoare annotation was computed. [2020-11-22 13:05:08,730 INFO L274 CegarLoopResult]: For program point L15-3(line 15) no Hoare annotation was computed. [2020-11-22 13:05:08,730 INFO L274 CegarLoopResult]: For program point fibo1FINAL(lines 9 17) no Hoare annotation was computed. [2020-11-22 13:05:08,730 INFO L274 CegarLoopResult]: For program point L10(lines 10 16) no Hoare annotation was computed. [2020-11-22 13:05:08,730 INFO L274 CegarLoopResult]: For program point fibo1EXIT(lines 9 17) no Hoare annotation was computed. [2020-11-22 13:05:08,743 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 22.11 01:05:08 BoogieIcfgContainer [2020-11-22 13:05:08,744 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-11-22 13:05:08,744 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2020-11-22 13:05:08,744 INFO L271 PluginConnector]: Initializing Witness Printer... [2020-11-22 13:05:08,745 INFO L275 PluginConnector]: Witness Printer initialized [2020-11-22 13:05:08,745 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.11 01:04:55" (3/4) ... [2020-11-22 13:05:08,748 INFO L137 WitnessPrinter]: Generating witness for correct program [2020-11-22 13:05:08,753 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure fibo2 [2020-11-22 13:05:08,754 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure fibo1 [2020-11-22 13:05:08,758 INFO L902 BoogieBacktranslator]: Reduced CFG by removing 11 nodes and edges [2020-11-22 13:05:08,758 INFO L902 BoogieBacktranslator]: Reduced CFG by removing 4 nodes and edges [2020-11-22 13:05:08,758 INFO L902 BoogieBacktranslator]: Reduced CFG by removing 2 nodes and edges [2020-11-22 13:05:08,758 INFO L902 BoogieBacktranslator]: Reduced CFG by removing 1 nodes and edges [2020-11-22 13:05:08,794 INFO L141 WitnessManager]: Wrote witness to /tmp/vcloud-vcloud-master/worker/run_dir_b4153374-b365-4410-addc-7af735774528/bin/utaipan/witness.graphml [2020-11-22 13:05:08,794 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2020-11-22 13:05:08,795 INFO L168 Benchmark]: Toolchain (without parser) took 13905.62 ms. Allocated memory was 83.9 MB in the beginning and 180.4 MB in the end (delta: 96.5 MB). Free memory was 53.3 MB in the beginning and 143.0 MB in the end (delta: -89.7 MB). Peak memory consumption was 5.7 MB. Max. memory is 16.1 GB. [2020-11-22 13:05:08,795 INFO L168 Benchmark]: CDTParser took 0.17 ms. Allocated memory is still 83.9 MB. Free memory was 54.4 MB in the beginning and 54.3 MB in the end (delta: 26.6 kB). There was no memory consumed. Max. memory is 16.1 GB. [2020-11-22 13:05:08,796 INFO L168 Benchmark]: CACSL2BoogieTranslator took 250.10 ms. Allocated memory was 83.9 MB in the beginning and 100.7 MB in the end (delta: 16.8 MB). Free memory was 53.1 MB in the beginning and 79.5 MB in the end (delta: -26.4 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. [2020-11-22 13:05:08,796 INFO L168 Benchmark]: Boogie Procedure Inliner took 29.88 ms. Allocated memory is still 100.7 MB. Free memory was 79.5 MB in the beginning and 78.0 MB in the end (delta: 1.6 MB). There was no memory consumed. Max. memory is 16.1 GB. [2020-11-22 13:05:08,797 INFO L168 Benchmark]: Boogie Preprocessor took 18.74 ms. Allocated memory is still 100.7 MB. Free memory was 78.0 MB in the beginning and 76.8 MB in the end (delta: 1.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2020-11-22 13:05:08,797 INFO L168 Benchmark]: RCFGBuilder took 399.08 ms. Allocated memory is still 100.7 MB. Free memory was 76.8 MB in the beginning and 62.2 MB in the end (delta: 14.6 MB). Peak memory consumption was 14.7 MB. Max. memory is 16.1 GB. [2020-11-22 13:05:08,798 INFO L168 Benchmark]: TraceAbstraction took 13152.43 ms. Allocated memory was 100.7 MB in the beginning and 180.4 MB in the end (delta: 79.7 MB). Free memory was 61.7 MB in the beginning and 146.2 MB in the end (delta: -84.5 MB). Peak memory consumption was 91.2 MB. Max. memory is 16.1 GB. [2020-11-22 13:05:08,799 INFO L168 Benchmark]: Witness Printer took 49.70 ms. Allocated memory is still 180.4 MB. Free memory was 146.2 MB in the beginning and 143.0 MB in the end (delta: 3.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2020-11-22 13:05:08,801 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.17 ms. Allocated memory is still 83.9 MB. Free memory was 54.4 MB in the beginning and 54.3 MB in the end (delta: 26.6 kB). There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 250.10 ms. Allocated memory was 83.9 MB in the beginning and 100.7 MB in the end (delta: 16.8 MB). Free memory was 53.1 MB in the beginning and 79.5 MB in the end (delta: -26.4 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. * Boogie Procedure Inliner took 29.88 ms. Allocated memory is still 100.7 MB. Free memory was 79.5 MB in the beginning and 78.0 MB in the end (delta: 1.6 MB). There was no memory consumed. Max. memory is 16.1 GB. * Boogie Preprocessor took 18.74 ms. Allocated memory is still 100.7 MB. Free memory was 78.0 MB in the beginning and 76.8 MB in the end (delta: 1.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * RCFGBuilder took 399.08 ms. Allocated memory is still 100.7 MB. Free memory was 76.8 MB in the beginning and 62.2 MB in the end (delta: 14.6 MB). Peak memory consumption was 14.7 MB. Max. memory is 16.1 GB. * TraceAbstraction took 13152.43 ms. Allocated memory was 100.7 MB in the beginning and 180.4 MB in the end (delta: 79.7 MB). Free memory was 61.7 MB in the beginning and 146.2 MB in the end (delta: -84.5 MB). Peak memory consumption was 91.2 MB. Max. memory is 16.1 GB. * Witness Printer took 49.70 ms. Allocated memory is still 180.4 MB. Free memory was 146.2 MB in the beginning and 143.0 MB in the end (delta: 3.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 4]: call of __VERIFIER_error() unreachable For all program executions holds that call of __VERIFIER_error() unreachable at this location - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - InvariantResult [Line: 40]: Loop Invariant Derived loop invariant: 4 <= x - StatisticsResult: Ultimate Automizer benchmark data CFG has 3 procedures, 26 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 12.7s, OverallIterations: 11, TraceHistogramMax: 6, AutomataDifference: 2.7s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.3s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 263 SDtfs, 276 SDslu, 1589 SDs, 0 SdLazy, 1480 SolverSat, 179 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 1.4s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 985 GetRequests, 777 SyntacticMatches, 60 SemanticMatches, 148 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 298 ImplicationChecksByTransitivity, 2.8s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=69occurred 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, 11 MinimizatonAttempts, 97 StatesRemovedByMinimization, 8 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 8 LocationsWithAnnotation, 86 PreInvPairs, 141 NumberOfFragments, 108 HoareAnnotationTreeSize, 86 FomulaSimplifications, 765 FormulaSimplificationTreeSizeReduction, 0.1s HoareSimplificationTime, 8 FomulaSimplificationsInter, 347 FormulaSimplificationTreeSizeReductionInter, 0.2s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.1s SsaConstructionTime, 0.4s SatisfiabilityAnalysisTime, 6.1s InterpolantComputationTime, 869 NumberOfCodeBlocks, 841 NumberOfCodeBlocksAsserted, 22 NumberOfCheckSat, 1265 ConstructedInterpolants, 0 QuantifiedInterpolants, 152628 SizeOfPredicates, 31 NumberOfNonLiveVariables, 1161 ConjunctsInSsa, 99 ConjunctsInUnsatCore, 29 InterpolantComputations, 2 PerfectInterpolantSequences, 943/1296 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...