./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/recursive-simple/fibo_2calls_6-1.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 7b2dab56 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7490f43b-da53-4754-a858-e7f75e557a3d/bin/utaipan-WLngWcDbfI/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7490f43b-da53-4754-a858-e7f75e557a3d/bin/utaipan-WLngWcDbfI/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7490f43b-da53-4754-a858-e7f75e557a3d/bin/utaipan-WLngWcDbfI/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7490f43b-da53-4754-a858-e7f75e557a3d/bin/utaipan-WLngWcDbfI/config/TaipanReach.xml -i ../../sv-benchmarks/c/recursive-simple/fibo_2calls_6-1.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7490f43b-da53-4754-a858-e7f75e557a3d/bin/utaipan-WLngWcDbfI/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7490f43b-da53-4754-a858-e7f75e557a3d/bin/utaipan-WLngWcDbfI --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 f8ce463a68003145f68f57eef3f97a99b93a908a ............................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... Execution finished normally Writing output log to file Ultimate.log Result: TRUE --- Real Ultimate output --- This is Ultimate 0.2.0-7b2dab5 [2021-10-11 02:23:09,575 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-10-11 02:23:09,577 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-10-11 02:23:09,608 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-10-11 02:23:09,609 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-10-11 02:23:09,610 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-10-11 02:23:09,612 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-10-11 02:23:09,614 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-10-11 02:23:09,616 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-10-11 02:23:09,618 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-10-11 02:23:09,619 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-10-11 02:23:09,621 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-10-11 02:23:09,621 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-10-11 02:23:09,623 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-10-11 02:23:09,624 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-10-11 02:23:09,626 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-10-11 02:23:09,627 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-10-11 02:23:09,628 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-10-11 02:23:09,630 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-10-11 02:23:09,633 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-10-11 02:23:09,635 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-10-11 02:23:09,640 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-10-11 02:23:09,641 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-10-11 02:23:09,643 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-10-11 02:23:09,647 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-10-11 02:23:09,651 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-10-11 02:23:09,653 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-10-11 02:23:09,655 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-10-11 02:23:09,659 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-10-11 02:23:09,661 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-10-11 02:23:09,662 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-10-11 02:23:09,663 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-10-11 02:23:09,664 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-10-11 02:23:09,666 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-10-11 02:23:09,668 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-10-11 02:23:09,669 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-10-11 02:23:09,670 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-10-11 02:23:09,670 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-10-11 02:23:09,670 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-10-11 02:23:09,671 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-10-11 02:23:09,672 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-10-11 02:23:09,675 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7490f43b-da53-4754-a858-e7f75e557a3d/bin/utaipan-WLngWcDbfI/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-10-11 02:23:09,711 INFO L113 SettingsManager]: Loading preferences was successful [2021-10-11 02:23:09,712 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-10-11 02:23:09,712 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-10-11 02:23:09,713 INFO L138 SettingsManager]: * User list type=DISABLED [2021-10-11 02:23:09,713 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-10-11 02:23:09,713 INFO L138 SettingsManager]: * Explicit value domain=true [2021-10-11 02:23:09,713 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-10-11 02:23:09,714 INFO L138 SettingsManager]: * Octagon Domain=false [2021-10-11 02:23:09,714 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-10-11 02:23:09,714 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-10-11 02:23:09,714 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-10-11 02:23:09,714 INFO L138 SettingsManager]: * Interval Domain=false [2021-10-11 02:23:09,715 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-10-11 02:23:09,715 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-10-11 02:23:09,715 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2021-10-11 02:23:09,716 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-10-11 02:23:09,716 INFO L138 SettingsManager]: * sizeof long=4 [2021-10-11 02:23:09,716 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-10-11 02:23:09,717 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-10-11 02:23:09,717 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-10-11 02:23:09,717 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-10-11 02:23:09,717 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-10-11 02:23:09,717 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-10-11 02:23:09,718 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-10-11 02:23:09,718 INFO L138 SettingsManager]: * sizeof long double=12 [2021-10-11 02:23:09,718 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-10-11 02:23:09,718 INFO L138 SettingsManager]: * Use constant arrays=true [2021-10-11 02:23:09,718 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-10-11 02:23:09,719 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-10-11 02:23:09,719 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-10-11 02:23:09,719 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-10-11 02:23:09,719 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-10-11 02:23:09,720 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-10-11 02:23:09,720 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-10-11 02:23:09,720 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-10-11 02:23:09,720 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-10-11 02:23:09,721 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-10-11 02:23:09,721 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-10-11 02:23:09,721 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-10-11 02:23:09,721 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_worker_vcloud-master_on_vcloud-master/run_dir_7490f43b-da53-4754-a858-e7f75e557a3d/bin/utaipan-WLngWcDbfI/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7490f43b-da53-4754-a858-e7f75e557a3d/bin/utaipan-WLngWcDbfI Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> f8ce463a68003145f68f57eef3f97a99b93a908a [2021-10-11 02:23:09,965 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-10-11 02:23:09,986 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-10-11 02:23:09,989 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-10-11 02:23:09,990 INFO L271 PluginConnector]: Initializing CDTParser... [2021-10-11 02:23:09,991 INFO L275 PluginConnector]: CDTParser initialized [2021-10-11 02:23:09,992 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7490f43b-da53-4754-a858-e7f75e557a3d/bin/utaipan-WLngWcDbfI/../../sv-benchmarks/c/recursive-simple/fibo_2calls_6-1.c [2021-10-11 02:23:10,051 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7490f43b-da53-4754-a858-e7f75e557a3d/bin/utaipan-WLngWcDbfI/data/9d88c519f/207940ebc4164b009aa3366bf4d35205/FLAG961b16bd0 [2021-10-11 02:23:10,454 INFO L306 CDTParser]: Found 1 translation units. [2021-10-11 02:23:10,454 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7490f43b-da53-4754-a858-e7f75e557a3d/sv-benchmarks/c/recursive-simple/fibo_2calls_6-1.c [2021-10-11 02:23:10,460 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7490f43b-da53-4754-a858-e7f75e557a3d/bin/utaipan-WLngWcDbfI/data/9d88c519f/207940ebc4164b009aa3366bf4d35205/FLAG961b16bd0 [2021-10-11 02:23:10,868 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7490f43b-da53-4754-a858-e7f75e557a3d/bin/utaipan-WLngWcDbfI/data/9d88c519f/207940ebc4164b009aa3366bf4d35205 [2021-10-11 02:23:10,870 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-10-11 02:23:10,871 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-10-11 02:23:10,873 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-10-11 02:23:10,873 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-10-11 02:23:10,880 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-10-11 02:23:10,881 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 11.10 02:23:10" (1/1) ... [2021-10-11 02:23:10,883 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7198df2c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.10 02:23:10, skipping insertion in model container [2021-10-11 02:23:10,883 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 11.10 02:23:10" (1/1) ... [2021-10-11 02:23:10,890 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-10-11 02:23:10,903 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-10-11 02:23:11,047 WARN L226 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7490f43b-da53-4754-a858-e7f75e557a3d/sv-benchmarks/c/recursive-simple/fibo_2calls_6-1.c[946,959] [2021-10-11 02:23:11,050 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-10-11 02:23:11,062 INFO L203 MainTranslator]: Completed pre-run [2021-10-11 02:23:11,092 WARN L226 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7490f43b-da53-4754-a858-e7f75e557a3d/sv-benchmarks/c/recursive-simple/fibo_2calls_6-1.c[946,959] [2021-10-11 02:23:11,093 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-10-11 02:23:11,105 INFO L208 MainTranslator]: Completed translation [2021-10-11 02:23:11,105 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.10 02:23:11 WrapperNode [2021-10-11 02:23:11,106 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-10-11 02:23:11,107 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-10-11 02:23:11,107 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-10-11 02:23:11,107 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-10-11 02:23:11,115 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.10 02:23:11" (1/1) ... [2021-10-11 02:23:11,125 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.10 02:23:11" (1/1) ... [2021-10-11 02:23:11,143 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-10-11 02:23:11,144 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-10-11 02:23:11,145 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-10-11 02:23:11,145 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-10-11 02:23:11,154 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.10 02:23:11" (1/1) ... [2021-10-11 02:23:11,154 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.10 02:23:11" (1/1) ... [2021-10-11 02:23:11,157 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.10 02:23:11" (1/1) ... [2021-10-11 02:23:11,158 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.10 02:23:11" (1/1) ... [2021-10-11 02:23:11,169 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.10 02:23:11" (1/1) ... [2021-10-11 02:23:11,172 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.10 02:23:11" (1/1) ... [2021-10-11 02:23:11,174 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.10 02:23:11" (1/1) ... [2021-10-11 02:23:11,182 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-10-11 02:23:11,183 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-10-11 02:23:11,183 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-10-11 02:23:11,183 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-10-11 02:23:11,184 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.10 02:23:11" (1/1) ... No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7490f43b-da53-4754-a858-e7f75e557a3d/bin/utaipan-WLngWcDbfI/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 [2021-10-11 02:23:11,252 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-10-11 02:23:11,252 INFO L130 BoogieDeclarations]: Found specification of procedure fibo2 [2021-10-11 02:23:11,253 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo2 [2021-10-11 02:23:11,253 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-10-11 02:23:11,253 INFO L130 BoogieDeclarations]: Found specification of procedure fibo1 [2021-10-11 02:23:11,253 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo1 [2021-10-11 02:23:11,253 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-10-11 02:23:11,253 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-10-11 02:23:11,617 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-10-11 02:23:11,617 INFO L299 CfgBuilder]: Removed 4 assume(true) statements. [2021-10-11 02:23:11,620 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 11.10 02:23:11 BoogieIcfgContainer [2021-10-11 02:23:11,620 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-10-11 02:23:11,622 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-10-11 02:23:11,622 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-10-11 02:23:11,635 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-10-11 02:23:11,636 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 11.10 02:23:10" (1/3) ... [2021-10-11 02:23:11,636 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@404b8db8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 11.10 02:23:11, skipping insertion in model container [2021-10-11 02:23:11,637 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.10 02:23:11" (2/3) ... [2021-10-11 02:23:11,637 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@404b8db8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 11.10 02:23:11, skipping insertion in model container [2021-10-11 02:23:11,637 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 11.10 02:23:11" (3/3) ... [2021-10-11 02:23:11,638 INFO L111 eAbstractionObserver]: Analyzing ICFG fibo_2calls_6-1.c [2021-10-11 02:23:11,652 INFO L180 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-10-11 02:23:11,655 INFO L192 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-10-11 02:23:11,667 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-10-11 02:23:11,705 INFO L377 AbstractCegarLoop]: Interprodecural is true [2021-10-11 02:23:11,705 INFO L378 AbstractCegarLoop]: Hoare is true [2021-10-11 02:23:11,705 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-10-11 02:23:11,705 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-10-11 02:23:11,706 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-10-11 02:23:11,706 INFO L382 AbstractCegarLoop]: Difference is false [2021-10-11 02:23:11,706 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-10-11 02:23:11,706 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-10-11 02:23:11,722 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states. [2021-10-11 02:23:11,727 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2021-10-11 02:23:11,727 INFO L414 BasicCegarLoop]: Found error trace [2021-10-11 02:23:11,729 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-11 02:23:11,730 INFO L429 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-10-11 02:23:11,736 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-11 02:23:11,744 INFO L82 PathProgramCache]: Analyzing trace with hash -389521846, now seen corresponding path program 1 times [2021-10-11 02:23:11,752 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-11 02:23:11,752 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1250908515] [2021-10-11 02:23:11,753 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-11 02:23:11,851 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-11 02:23:11,929 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-11 02:23:11,930 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1250908515] [2021-10-11 02:23:11,931 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-11 02:23:11,931 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-10-11 02:23:11,932 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1878775146] [2021-10-11 02:23:11,937 INFO L461 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-10-11 02:23:11,937 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-10-11 02:23:11,950 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-10-11 02:23:11,951 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-10-11 02:23:11,954 INFO L87 Difference]: Start difference. First operand 26 states. Second operand 5 states. [2021-10-11 02:23:12,042 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-11 02:23:12,043 INFO L93 Difference]: Finished difference Result 34 states and 43 transitions. [2021-10-11 02:23:12,044 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-10-11 02:23:12,045 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 9 [2021-10-11 02:23:12,046 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-11 02:23:12,054 INFO L225 Difference]: With dead ends: 34 [2021-10-11 02:23:12,054 INFO L226 Difference]: Without dead ends: 26 [2021-10-11 02:23:12,057 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 [2021-10-11 02:23:12,074 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2021-10-11 02:23:12,095 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2021-10-11 02:23:12,097 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2021-10-11 02:23:12,098 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 33 transitions. [2021-10-11 02:23:12,100 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 33 transitions. Word has length 9 [2021-10-11 02:23:12,100 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-11 02:23:12,101 INFO L481 AbstractCegarLoop]: Abstraction has 26 states and 33 transitions. [2021-10-11 02:23:12,101 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2021-10-11 02:23:12,101 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 33 transitions. [2021-10-11 02:23:12,102 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-10-11 02:23:12,102 INFO L414 BasicCegarLoop]: Found error trace [2021-10-11 02:23:12,103 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-11 02:23:12,103 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-10-11 02:23:12,103 INFO L429 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-10-11 02:23:12,104 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-11 02:23:12,104 INFO L82 PathProgramCache]: Analyzing trace with hash 1524884472, now seen corresponding path program 1 times [2021-10-11 02:23:12,105 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-11 02:23:12,105 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1079605582] [2021-10-11 02:23:12,105 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-11 02:23:12,122 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-11 02:23:12,156 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-11 02:23:12,157 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1079605582] [2021-10-11 02:23:12,157 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-11 02:23:12,157 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-10-11 02:23:12,158 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [270493910] [2021-10-11 02:23:12,159 INFO L461 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-10-11 02:23:12,159 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-10-11 02:23:12,160 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-10-11 02:23:12,161 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-10-11 02:23:12,161 INFO L87 Difference]: Start difference. First operand 26 states and 33 transitions. Second operand 5 states. [2021-10-11 02:23:12,216 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-11 02:23:12,217 INFO L93 Difference]: Finished difference Result 32 states and 40 transitions. [2021-10-11 02:23:12,217 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-10-11 02:23:12,217 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 10 [2021-10-11 02:23:12,218 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-11 02:23:12,219 INFO L225 Difference]: With dead ends: 32 [2021-10-11 02:23:12,219 INFO L226 Difference]: Without dead ends: 28 [2021-10-11 02:23:12,220 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 [2021-10-11 02:23:12,221 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2021-10-11 02:23:12,226 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 26. [2021-10-11 02:23:12,227 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2021-10-11 02:23:12,228 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 33 transitions. [2021-10-11 02:23:12,228 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 33 transitions. Word has length 10 [2021-10-11 02:23:12,229 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-11 02:23:12,229 INFO L481 AbstractCegarLoop]: Abstraction has 26 states and 33 transitions. [2021-10-11 02:23:12,229 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2021-10-11 02:23:12,229 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 33 transitions. [2021-10-11 02:23:12,230 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-10-11 02:23:12,231 INFO L414 BasicCegarLoop]: Found error trace [2021-10-11 02:23:12,231 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-11 02:23:12,231 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-10-11 02:23:12,231 INFO L429 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-10-11 02:23:12,232 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-11 02:23:12,232 INFO L82 PathProgramCache]: Analyzing trace with hash 741502751, now seen corresponding path program 1 times [2021-10-11 02:23:12,233 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-11 02:23:12,233 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1995668380] [2021-10-11 02:23:12,233 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-11 02:23:12,254 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-11 02:23:12,378 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-11 02:23:12,378 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1995668380] [2021-10-11 02:23:12,378 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2082489814] [2021-10-11 02:23:12,379 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7490f43b-da53-4754-a858-e7f75e557a3d/bin/utaipan-WLngWcDbfI/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 [2021-10-11 02:23:12,460 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-11 02:23:12,465 INFO L263 TraceCheckSpWp]: Trace formula consists of 80 conjuncts, 6 conjunts are in the unsatisfiable core [2021-10-11 02:23:12,470 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-11 02:23:12,643 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-11 02:23:12,644 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-11 02:23:12,884 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-11 02:23:12,885 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1174666010] [2021-10-11 02:23:12,919 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2021-10-11 02:23:12,919 INFO L166 IcfgInterpreter]: Building call graph [2021-10-11 02:23:12,926 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-10-11 02:23:12,942 INFO L176 IcfgInterpreter]: Starting interpretation [2021-10-11 02:23:12,943 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-10-11 02:23:13,194 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:138) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.iterateNew(TraceAbstractionStarter.java:345) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:198) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-10-11 02:23:13,197 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-10-11 02:23:13,198 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7, 7] total 12 [2021-10-11 02:23:13,199 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [456474405] [2021-10-11 02:23:13,200 INFO L461 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-10-11 02:23:13,201 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-10-11 02:23:13,201 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-10-11 02:23:13,202 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=104, Unknown=0, NotChecked=0, Total=132 [2021-10-11 02:23:13,202 INFO L87 Difference]: Start difference. First operand 26 states and 33 transitions. Second operand 12 states. [2021-10-11 02:23:13,403 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-11 02:23:13,404 INFO L93 Difference]: Finished difference Result 54 states and 74 transitions. [2021-10-11 02:23:13,404 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-10-11 02:23:13,405 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 22 [2021-10-11 02:23:13,405 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-11 02:23:13,408 INFO L225 Difference]: With dead ends: 54 [2021-10-11 02:23:13,408 INFO L226 Difference]: Without dead ends: 30 [2021-10-11 02:23:13,411 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 34 SyntacticMatches, 5 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=58, Invalid=214, Unknown=0, NotChecked=0, Total=272 [2021-10-11 02:23:13,411 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2021-10-11 02:23:13,423 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 28. [2021-10-11 02:23:13,423 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2021-10-11 02:23:13,424 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 35 transitions. [2021-10-11 02:23:13,425 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 35 transitions. Word has length 22 [2021-10-11 02:23:13,425 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-11 02:23:13,426 INFO L481 AbstractCegarLoop]: Abstraction has 28 states and 35 transitions. [2021-10-11 02:23:13,426 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2021-10-11 02:23:13,426 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 35 transitions. [2021-10-11 02:23:13,430 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-10-11 02:23:13,430 INFO L414 BasicCegarLoop]: Found error trace [2021-10-11 02:23:13,430 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] [2021-10-11 02:23:13,657 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2021-10-11 02:23:13,657 INFO L429 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-10-11 02:23:13,657 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-11 02:23:13,658 INFO L82 PathProgramCache]: Analyzing trace with hash 1785876995, now seen corresponding path program 1 times [2021-10-11 02:23:13,658 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-11 02:23:13,658 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1387175656] [2021-10-11 02:23:13,658 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-11 02:23:13,688 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-11 02:23:13,759 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-11 02:23:13,759 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1387175656] [2021-10-11 02:23:13,760 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1284685464] [2021-10-11 02:23:13,760 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7490f43b-da53-4754-a858-e7f75e557a3d/bin/utaipan-WLngWcDbfI/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 [2021-10-11 02:23:13,822 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-11 02:23:13,823 INFO L263 TraceCheckSpWp]: Trace formula consists of 82 conjuncts, 6 conjunts are in the unsatisfiable core [2021-10-11 02:23:13,826 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-11 02:23:13,884 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-11 02:23:13,884 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-11 02:23:14,077 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-11 02:23:14,078 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1010213804] [2021-10-11 02:23:14,081 INFO L159 IcfgInterpreter]: Started Sifa with 20 locations of interest [2021-10-11 02:23:14,081 INFO L166 IcfgInterpreter]: Building call graph [2021-10-11 02:23:14,082 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-10-11 02:23:14,082 INFO L176 IcfgInterpreter]: Starting interpretation [2021-10-11 02:23:14,083 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-10-11 02:23:14,368 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:138) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.iterateNew(TraceAbstractionStarter.java:345) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:198) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-10-11 02:23:14,370 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-10-11 02:23:14,370 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 10 [2021-10-11 02:23:14,370 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1844941483] [2021-10-11 02:23:14,371 INFO L461 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-10-11 02:23:14,371 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-10-11 02:23:14,372 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-10-11 02:23:14,372 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2021-10-11 02:23:14,372 INFO L87 Difference]: Start difference. First operand 28 states and 35 transitions. Second operand 10 states. [2021-10-11 02:23:14,483 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-11 02:23:14,483 INFO L93 Difference]: Finished difference Result 39 states and 51 transitions. [2021-10-11 02:23:14,484 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-10-11 02:23:14,484 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 23 [2021-10-11 02:23:14,485 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-11 02:23:14,489 INFO L225 Difference]: With dead ends: 39 [2021-10-11 02:23:14,489 INFO L226 Difference]: Without dead ends: 35 [2021-10-11 02:23:14,490 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 44 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=32, Invalid=100, Unknown=0, NotChecked=0, Total=132 [2021-10-11 02:23:14,490 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2021-10-11 02:23:14,503 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 33. [2021-10-11 02:23:14,504 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2021-10-11 02:23:14,511 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 44 transitions. [2021-10-11 02:23:14,511 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 44 transitions. Word has length 23 [2021-10-11 02:23:14,512 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-11 02:23:14,512 INFO L481 AbstractCegarLoop]: Abstraction has 33 states and 44 transitions. [2021-10-11 02:23:14,512 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2021-10-11 02:23:14,512 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 44 transitions. [2021-10-11 02:23:14,516 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-10-11 02:23:14,516 INFO L414 BasicCegarLoop]: Found error trace [2021-10-11 02:23:14,516 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] [2021-10-11 02:23:14,733 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-10-11 02:23:14,733 INFO L429 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-10-11 02:23:14,734 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-11 02:23:14,734 INFO L82 PathProgramCache]: Analyzing trace with hash -1754399412, now seen corresponding path program 1 times [2021-10-11 02:23:14,734 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-11 02:23:14,734 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [526072003] [2021-10-11 02:23:14,735 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-11 02:23:14,776 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-11 02:23:14,818 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 5 proven. 5 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-10-11 02:23:14,818 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [526072003] [2021-10-11 02:23:14,819 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1885434246] [2021-10-11 02:23:14,819 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7490f43b-da53-4754-a858-e7f75e557a3d/bin/utaipan-WLngWcDbfI/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 [2021-10-11 02:23:14,877 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-11 02:23:14,879 INFO L263 TraceCheckSpWp]: Trace formula consists of 109 conjuncts, 8 conjunts are in the unsatisfiable core [2021-10-11 02:23:14,883 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-11 02:23:14,990 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-10-11 02:23:14,990 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-11 02:23:15,323 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 2 proven. 10 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-10-11 02:23:15,323 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1537257799] [2021-10-11 02:23:15,329 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2021-10-11 02:23:15,329 INFO L166 IcfgInterpreter]: Building call graph [2021-10-11 02:23:15,330 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:289) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:189) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:179) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:84) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:74) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:511) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterateInternal(AbstractCegarLoop.java:438) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:372) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopResult.iterate(CegarLoopResult.java:138) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.iterateNew(TraceAbstractionStarter.java:345) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:198) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-10-11 02:23:15,331 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-10-11 02:23:15,331 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 8, 9] total 14 [2021-10-11 02:23:15,331 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1889799916] [2021-10-11 02:23:15,333 INFO L461 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-10-11 02:23:15,334 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-10-11 02:23:15,334 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-10-11 02:23:15,335 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2021-10-11 02:23:15,335 INFO L87 Difference]: Start difference. First operand 33 states and 44 transitions. Second operand 14 states. [2021-10-11 02:23:15,540 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-11 02:23:15,540 INFO L93 Difference]: Finished difference Result 66 states and 96 transitions. [2021-10-11 02:23:15,540 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-10-11 02:23:15,542 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 35 [2021-10-11 02:23:15,542 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-11 02:23:15,546 INFO L225 Difference]: With dead ends: 66 [2021-10-11 02:23:15,550 INFO L226 Difference]: Without dead ends: 35 [2021-10-11 02:23:15,552 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 59 SyntacticMatches, 7 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 45 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=75, Invalid=305, Unknown=0, NotChecked=0, Total=380 [2021-10-11 02:23:15,553 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2021-10-11 02:23:15,561 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2021-10-11 02:23:15,561 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2021-10-11 02:23:15,562 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 46 transitions. [2021-10-11 02:23:15,563 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 46 transitions. Word has length 35 [2021-10-11 02:23:15,563 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-11 02:23:15,563 INFO L481 AbstractCegarLoop]: Abstraction has 35 states and 46 transitions. [2021-10-11 02:23:15,564 INFO L482 AbstractCegarLoop]: Interpolant automaton has 14 states. [2021-10-11 02:23:15,564 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 46 transitions. [2021-10-11 02:23:15,565 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-10-11 02:23:15,565 INFO L414 BasicCegarLoop]: Found error trace [2021-10-11 02:23:15,566 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] [2021-10-11 02:23:15,766 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable32 [2021-10-11 02:23:15,766 INFO L429 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-10-11 02:23:15,767 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-11 02:23:15,767 INFO L82 PathProgramCache]: Analyzing trace with hash 2101254926, now seen corresponding path program 1 times [2021-10-11 02:23:15,767 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-11 02:23:15,767 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [204861461] [2021-10-11 02:23:15,767 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-11 02:23:15,780 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-11 02:23:15,859 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 4 proven. 3 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-10-11 02:23:15,859 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [204861461] [2021-10-11 02:23:15,860 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [964496997] [2021-10-11 02:23:15,860 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7490f43b-da53-4754-a858-e7f75e557a3d/bin/utaipan-WLngWcDbfI/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 [2021-10-11 02:23:15,921 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-11 02:23:15,922 INFO L263 TraceCheckSpWp]: Trace formula consists of 111 conjuncts, 8 conjunts are in the unsatisfiable core [2021-10-11 02:23:15,930 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-11 02:23:16,024 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-10-11 02:23:16,024 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-11 02:23:16,339 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 2 proven. 11 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-10-11 02:23:16,339 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [463250751] [2021-10-11 02:23:16,343 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2021-10-11 02:23:16,343 INFO L166 IcfgInterpreter]: Building call graph [2021-10-11 02:23:16,344 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:289) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:189) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:179) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:84) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:74) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:511) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterateInternal(AbstractCegarLoop.java:438) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:372) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopResult.iterate(CegarLoopResult.java:138) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.iterateNew(TraceAbstractionStarter.java:345) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:198) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-10-11 02:23:16,345 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-10-11 02:23:16,345 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8, 9] total 18 [2021-10-11 02:23:16,345 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [554095598] [2021-10-11 02:23:16,347 INFO L461 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-10-11 02:23:16,347 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-10-11 02:23:16,347 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-10-11 02:23:16,348 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=257, Unknown=0, NotChecked=0, Total=306 [2021-10-11 02:23:16,348 INFO L87 Difference]: Start difference. First operand 35 states and 46 transitions. Second operand 18 states. [2021-10-11 02:23:16,937 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-11 02:23:16,937 INFO L93 Difference]: Finished difference Result 98 states and 158 transitions. [2021-10-11 02:23:16,938 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-10-11 02:23:16,938 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 36 [2021-10-11 02:23:16,938 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-11 02:23:16,939 INFO L225 Difference]: With dead ends: 98 [2021-10-11 02:23:16,940 INFO L226 Difference]: Without dead ends: 65 [2021-10-11 02:23:16,941 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 71 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 104 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=142, Invalid=670, Unknown=0, NotChecked=0, Total=812 [2021-10-11 02:23:16,942 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2021-10-11 02:23:16,951 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 56. [2021-10-11 02:23:16,951 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2021-10-11 02:23:16,952 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 86 transitions. [2021-10-11 02:23:16,953 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 86 transitions. Word has length 36 [2021-10-11 02:23:16,953 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-11 02:23:16,953 INFO L481 AbstractCegarLoop]: Abstraction has 56 states and 86 transitions. [2021-10-11 02:23:16,953 INFO L482 AbstractCegarLoop]: Interpolant automaton has 18 states. [2021-10-11 02:23:16,953 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 86 transitions. [2021-10-11 02:23:16,955 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-10-11 02:23:16,956 INFO L414 BasicCegarLoop]: Found error trace [2021-10-11 02:23:16,956 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] [2021-10-11 02:23:17,169 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-11 02:23:17,169 INFO L429 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-10-11 02:23:17,169 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-11 02:23:17,169 INFO L82 PathProgramCache]: Analyzing trace with hash 644290867, now seen corresponding path program 1 times [2021-10-11 02:23:17,170 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-11 02:23:17,170 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [277823251] [2021-10-11 02:23:17,170 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-11 02:23:17,186 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-11 02:23:17,270 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 12 proven. 12 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-10-11 02:23:17,270 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [277823251] [2021-10-11 02:23:17,270 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [885017418] [2021-10-11 02:23:17,271 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7490f43b-da53-4754-a858-e7f75e557a3d/bin/utaipan-WLngWcDbfI/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 [2021-10-11 02:23:17,337 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-11 02:23:17,338 INFO L263 TraceCheckSpWp]: Trace formula consists of 142 conjuncts, 10 conjunts are in the unsatisfiable core [2021-10-11 02:23:17,340 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-11 02:23:17,462 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 4 proven. 23 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2021-10-11 02:23:17,462 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-11 02:23:18,090 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 4 proven. 28 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-10-11 02:23:18,090 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1699869935] [2021-10-11 02:23:18,093 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2021-10-11 02:23:18,094 INFO L166 IcfgInterpreter]: Building call graph [2021-10-11 02:23:18,094 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:289) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:189) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:179) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:84) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:74) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:511) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterateInternal(AbstractCegarLoop.java:438) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:372) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopResult.iterate(CegarLoopResult.java:138) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.iterateNew(TraceAbstractionStarter.java:345) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:198) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-10-11 02:23:18,094 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-10-11 02:23:18,095 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9, 11] total 17 [2021-10-11 02:23:18,095 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1961326100] [2021-10-11 02:23:18,096 INFO L461 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-10-11 02:23:18,097 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-10-11 02:23:18,097 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-10-11 02:23:18,097 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2021-10-11 02:23:18,098 INFO L87 Difference]: Start difference. First operand 56 states and 86 transitions. Second operand 17 states. [2021-10-11 02:23:18,446 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-11 02:23:18,446 INFO L93 Difference]: Finished difference Result 102 states and 193 transitions. [2021-10-11 02:23:18,447 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-10-11 02:23:18,447 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 50 [2021-10-11 02:23:18,447 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-11 02:23:18,449 INFO L225 Difference]: With dead ends: 102 [2021-10-11 02:23:18,450 INFO L226 Difference]: Without dead ends: 98 [2021-10-11 02:23:18,450 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 117 GetRequests, 95 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 76 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=115, Invalid=437, Unknown=0, NotChecked=0, Total=552 [2021-10-11 02:23:18,451 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2021-10-11 02:23:18,469 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 64. [2021-10-11 02:23:18,470 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2021-10-11 02:23:18,471 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 106 transitions. [2021-10-11 02:23:18,473 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 106 transitions. Word has length 50 [2021-10-11 02:23:18,474 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-11 02:23:18,474 INFO L481 AbstractCegarLoop]: Abstraction has 64 states and 106 transitions. [2021-10-11 02:23:18,474 INFO L482 AbstractCegarLoop]: Interpolant automaton has 17 states. [2021-10-11 02:23:18,474 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 106 transitions. [2021-10-11 02:23:18,479 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 107 [2021-10-11 02:23:18,480 INFO L414 BasicCegarLoop]: Found error trace [2021-10-11 02:23:18,481 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 7, 6, 6, 6, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1] [2021-10-11 02:23:18,685 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable34 [2021-10-11 02:23:18,685 INFO L429 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-10-11 02:23:18,685 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-11 02:23:18,685 INFO L82 PathProgramCache]: Analyzing trace with hash -110138383, now seen corresponding path program 1 times [2021-10-11 02:23:18,685 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-11 02:23:18,686 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [707120200] [2021-10-11 02:23:18,686 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-11 02:23:18,726 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-11 02:23:18,890 INFO L134 CoverageAnalysis]: Checked inductivity of 276 backedges. 44 proven. 81 refuted. 0 times theorem prover too weak. 151 trivial. 0 not checked. [2021-10-11 02:23:18,890 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [707120200] [2021-10-11 02:23:18,890 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1302930771] [2021-10-11 02:23:18,890 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7490f43b-da53-4754-a858-e7f75e557a3d/bin/utaipan-WLngWcDbfI/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 [2021-10-11 02:23:18,991 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-11 02:23:18,993 INFO L263 TraceCheckSpWp]: Trace formula consists of 266 conjuncts, 12 conjunts are in the unsatisfiable core [2021-10-11 02:23:18,996 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-11 02:23:19,255 INFO L134 CoverageAnalysis]: Checked inductivity of 276 backedges. 17 proven. 119 refuted. 0 times theorem prover too weak. 140 trivial. 0 not checked. [2021-10-11 02:23:19,255 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-11 02:23:20,422 INFO L134 CoverageAnalysis]: Checked inductivity of 276 backedges. 17 proven. 129 refuted. 0 times theorem prover too weak. 130 trivial. 0 not checked. [2021-10-11 02:23:20,422 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1345911980] [2021-10-11 02:23:20,425 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2021-10-11 02:23:20,425 INFO L166 IcfgInterpreter]: Building call graph [2021-10-11 02:23:20,426 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:289) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:189) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:179) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:84) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:74) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:511) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterateInternal(AbstractCegarLoop.java:438) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:372) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopResult.iterate(CegarLoopResult.java:138) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.iterateNew(TraceAbstractionStarter.java:345) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:198) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-10-11 02:23:20,427 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-10-11 02:23:20,427 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10, 13] total 22 [2021-10-11 02:23:20,427 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [814853563] [2021-10-11 02:23:20,428 INFO L461 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-10-11 02:23:20,428 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-10-11 02:23:20,429 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-10-11 02:23:20,429 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=64, Invalid=398, Unknown=0, NotChecked=0, Total=462 [2021-10-11 02:23:20,429 INFO L87 Difference]: Start difference. First operand 64 states and 106 transitions. Second operand 22 states. [2021-10-11 02:23:21,373 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-11 02:23:21,373 INFO L93 Difference]: Finished difference Result 175 states and 367 transitions. [2021-10-11 02:23:21,373 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-10-11 02:23:21,374 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 106 [2021-10-11 02:23:21,374 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-11 02:23:21,377 INFO L225 Difference]: With dead ends: 175 [2021-10-11 02:23:21,377 INFO L226 Difference]: Without dead ends: 101 [2021-10-11 02:23:21,380 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 239 GetRequests, 200 SyntacticMatches, 2 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 211 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=260, Invalid=1222, Unknown=0, NotChecked=0, Total=1482 [2021-10-11 02:23:21,380 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 101 states. [2021-10-11 02:23:21,396 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 101 to 90. [2021-10-11 02:23:21,396 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 90 states. [2021-10-11 02:23:21,398 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 129 transitions. [2021-10-11 02:23:21,398 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 129 transitions. Word has length 106 [2021-10-11 02:23:21,399 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-11 02:23:21,399 INFO L481 AbstractCegarLoop]: Abstraction has 90 states and 129 transitions. [2021-10-11 02:23:21,399 INFO L482 AbstractCegarLoop]: Interpolant automaton has 22 states. [2021-10-11 02:23:21,399 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 129 transitions. [2021-10-11 02:23:21,403 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 213 [2021-10-11 02:23:21,403 INFO L414 BasicCegarLoop]: Found error trace [2021-10-11 02:23:21,403 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 14, 13, 13, 9, 9, 9, 9, 9, 9, 9, 9, 8, 6, 6, 6, 6, 6, 6, 6, 4, 4, 1, 1, 1, 1, 1, 1] [2021-10-11 02:23:21,617 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-11 02:23:21,617 INFO L429 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-10-11 02:23:21,617 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-11 02:23:21,617 INFO L82 PathProgramCache]: Analyzing trace with hash -1888157483, now seen corresponding path program 2 times [2021-10-11 02:23:21,618 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-11 02:23:21,618 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [117789786] [2021-10-11 02:23:21,618 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-11 02:23:21,664 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-11 02:23:21,856 INFO L134 CoverageAnalysis]: Checked inductivity of 1255 backedges. 60 proven. 266 refuted. 0 times theorem prover too weak. 929 trivial. 0 not checked. [2021-10-11 02:23:21,857 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [117789786] [2021-10-11 02:23:21,858 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1202301484] [2021-10-11 02:23:21,858 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7490f43b-da53-4754-a858-e7f75e557a3d/bin/utaipan-WLngWcDbfI/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 [2021-10-11 02:23:21,963 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-10-11 02:23:21,963 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-11 02:23:21,964 INFO L263 TraceCheckSpWp]: Trace formula consists of 140 conjuncts, 8 conjunts are in the unsatisfiable core [2021-10-11 02:23:21,983 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-11 02:23:22,319 INFO L134 CoverageAnalysis]: Checked inductivity of 1255 backedges. 376 proven. 6 refuted. 0 times theorem prover too weak. 873 trivial. 0 not checked. [2021-10-11 02:23:22,319 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-11 02:23:23,398 INFO L134 CoverageAnalysis]: Checked inductivity of 1255 backedges. 301 proven. 12 refuted. 0 times theorem prover too weak. 942 trivial. 0 not checked. [2021-10-11 02:23:23,399 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [256068434] [2021-10-11 02:23:23,401 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2021-10-11 02:23:23,402 INFO L166 IcfgInterpreter]: Building call graph [2021-10-11 02:23:23,402 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:289) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:189) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:179) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:84) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:74) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:511) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterateInternal(AbstractCegarLoop.java:438) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:372) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopResult.iterate(CegarLoopResult.java:138) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.iterateNew(TraceAbstractionStarter.java:345) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:198) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-10-11 02:23:23,403 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-10-11 02:23:23,403 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9, 9] total 18 [2021-10-11 02:23:23,404 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1429751337] [2021-10-11 02:23:23,405 INFO L461 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-10-11 02:23:23,405 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-10-11 02:23:23,406 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-10-11 02:23:23,406 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=263, Unknown=0, NotChecked=0, Total=306 [2021-10-11 02:23:23,406 INFO L87 Difference]: Start difference. First operand 90 states and 129 transitions. Second operand 18 states. [2021-10-11 02:23:24,116 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-11 02:23:24,117 INFO L93 Difference]: Finished difference Result 205 states and 314 transitions. [2021-10-11 02:23:24,118 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-10-11 02:23:24,119 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 212 [2021-10-11 02:23:24,119 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-11 02:23:24,121 INFO L225 Difference]: With dead ends: 205 [2021-10-11 02:23:24,121 INFO L226 Difference]: Without dead ends: 124 [2021-10-11 02:23:24,122 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 450 GetRequests, 417 SyntacticMatches, 3 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 111 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=173, Invalid=819, Unknown=0, NotChecked=0, Total=992 [2021-10-11 02:23:24,123 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2021-10-11 02:23:24,136 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 87. [2021-10-11 02:23:24,136 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 87 states. [2021-10-11 02:23:24,138 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 123 transitions. [2021-10-11 02:23:24,138 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 123 transitions. Word has length 212 [2021-10-11 02:23:24,139 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-11 02:23:24,139 INFO L481 AbstractCegarLoop]: Abstraction has 87 states and 123 transitions. [2021-10-11 02:23:24,139 INFO L482 AbstractCegarLoop]: Interpolant automaton has 18 states. [2021-10-11 02:23:24,139 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 123 transitions. [2021-10-11 02:23:24,142 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 161 [2021-10-11 02:23:24,142 INFO L414 BasicCegarLoop]: Found error trace [2021-10-11 02:23:24,142 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 10, 9, 9, 9, 7, 7, 7, 7, 7, 7, 7, 6, 4, 4, 4, 4, 4, 4, 4, 4, 2, 1, 1, 1, 1, 1, 1] [2021-10-11 02:23:24,368 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable36 [2021-10-11 02:23:24,368 INFO L429 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-10-11 02:23:24,369 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-11 02:23:24,369 INFO L82 PathProgramCache]: Analyzing trace with hash -225787115, now seen corresponding path program 1 times [2021-10-11 02:23:24,369 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-11 02:23:24,369 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2133316440] [2021-10-11 02:23:24,369 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-11 02:23:24,400 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-11 02:23:24,515 INFO L134 CoverageAnalysis]: Checked inductivity of 697 backedges. 54 proven. 149 refuted. 0 times theorem prover too weak. 494 trivial. 0 not checked. [2021-10-11 02:23:24,515 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2133316440] [2021-10-11 02:23:24,515 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [397563793] [2021-10-11 02:23:24,515 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7490f43b-da53-4754-a858-e7f75e557a3d/bin/utaipan-WLngWcDbfI/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 [2021-10-11 02:23:24,630 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-11 02:23:24,632 INFO L263 TraceCheckSpWp]: Trace formula consists of 386 conjuncts, 10 conjunts are in the unsatisfiable core [2021-10-11 02:23:24,638 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-11 02:23:24,812 INFO L134 CoverageAnalysis]: Checked inductivity of 697 backedges. 54 proven. 149 refuted. 0 times theorem prover too weak. 494 trivial. 0 not checked. [2021-10-11 02:23:24,812 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-11 02:23:25,690 INFO L134 CoverageAnalysis]: Checked inductivity of 697 backedges. 54 proven. 154 refuted. 0 times theorem prover too weak. 489 trivial. 0 not checked. [2021-10-11 02:23:25,690 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [41804436] [2021-10-11 02:23:25,693 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2021-10-11 02:23:25,693 INFO L166 IcfgInterpreter]: Building call graph [2021-10-11 02:23:25,693 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:289) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:189) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:179) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:84) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:74) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:511) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterateInternal(AbstractCegarLoop.java:438) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:372) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopResult.iterate(CegarLoopResult.java:138) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.iterateNew(TraceAbstractionStarter.java:345) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:198) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-10-11 02:23:25,693 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-10-11 02:23:25,694 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 11] total 13 [2021-10-11 02:23:25,694 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [411072293] [2021-10-11 02:23:25,695 INFO L461 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-10-11 02:23:25,695 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-10-11 02:23:25,695 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-10-11 02:23:25,695 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=121, Unknown=0, NotChecked=0, Total=156 [2021-10-11 02:23:25,695 INFO L87 Difference]: Start difference. First operand 87 states and 123 transitions. Second operand 13 states. [2021-10-11 02:23:25,869 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-11 02:23:25,869 INFO L93 Difference]: Finished difference Result 107 states and 161 transitions. [2021-10-11 02:23:25,869 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-10-11 02:23:25,869 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 160 [2021-10-11 02:23:25,870 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-11 02:23:25,872 INFO L225 Difference]: With dead ends: 107 [2021-10-11 02:23:25,872 INFO L226 Difference]: Without dead ends: 103 [2021-10-11 02:23:25,873 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 334 GetRequests, 317 SyntacticMatches, 2 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=63, Invalid=209, Unknown=0, NotChecked=0, Total=272 [2021-10-11 02:23:25,873 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2021-10-11 02:23:25,886 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 97. [2021-10-11 02:23:25,886 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 97 states. [2021-10-11 02:23:25,888 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 146 transitions. [2021-10-11 02:23:25,888 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 146 transitions. Word has length 160 [2021-10-11 02:23:25,888 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-11 02:23:25,889 INFO L481 AbstractCegarLoop]: Abstraction has 97 states and 146 transitions. [2021-10-11 02:23:25,889 INFO L482 AbstractCegarLoop]: Interpolant automaton has 13 states. [2021-10-11 02:23:25,889 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 146 transitions. [2021-10-11 02:23:25,892 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 188 [2021-10-11 02:23:25,892 INFO L414 BasicCegarLoop]: Found error trace [2021-10-11 02:23:25,892 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 13, 13, 11, 11, 7, 7, 7, 7, 7, 7, 7, 6, 6, 6, 6, 6, 6, 6, 5, 4, 3, 2, 1, 1, 1, 1, 1, 1] [2021-10-11 02:23:26,117 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable37 [2021-10-11 02:23:26,117 INFO L429 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-10-11 02:23:26,117 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-11 02:23:26,117 INFO L82 PathProgramCache]: Analyzing trace with hash -1586265017, now seen corresponding path program 1 times [2021-10-11 02:23:26,117 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-11 02:23:26,118 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [646852915] [2021-10-11 02:23:26,118 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-11 02:23:26,154 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-11 02:23:26,328 INFO L134 CoverageAnalysis]: Checked inductivity of 930 backedges. 147 proven. 163 refuted. 0 times theorem prover too weak. 620 trivial. 0 not checked. [2021-10-11 02:23:26,328 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [646852915] [2021-10-11 02:23:26,328 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [668318462] [2021-10-11 02:23:26,328 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7490f43b-da53-4754-a858-e7f75e557a3d/bin/utaipan-WLngWcDbfI/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 [2021-10-11 02:23:26,494 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-11 02:23:26,495 INFO L263 TraceCheckSpWp]: Trace formula consists of 446 conjuncts, 14 conjunts are in the unsatisfiable core [2021-10-11 02:23:26,500 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-11 02:23:26,762 INFO L134 CoverageAnalysis]: Checked inductivity of 930 backedges. 164 proven. 179 refuted. 0 times theorem prover too weak. 587 trivial. 0 not checked. [2021-10-11 02:23:26,763 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-11 02:23:28,398 INFO L134 CoverageAnalysis]: Checked inductivity of 930 backedges. 164 proven. 193 refuted. 0 times theorem prover too weak. 573 trivial. 0 not checked. [2021-10-11 02:23:28,398 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2117644645] [2021-10-11 02:23:28,400 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2021-10-11 02:23:28,400 INFO L166 IcfgInterpreter]: Building call graph [2021-10-11 02:23:28,401 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:289) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:189) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:179) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:84) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:74) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:511) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterateInternal(AbstractCegarLoop.java:438) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:372) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopResult.iterate(CegarLoopResult.java:138) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.iterateNew(TraceAbstractionStarter.java:345) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:198) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-10-11 02:23:28,402 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-10-11 02:23:28,402 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 11, 15] total 20 [2021-10-11 02:23:28,402 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [126633345] [2021-10-11 02:23:28,403 INFO L461 AbstractCegarLoop]: Interpolant automaton has 20 states [2021-10-11 02:23:28,404 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-10-11 02:23:28,404 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-10-11 02:23:28,405 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=76, Invalid=304, Unknown=0, NotChecked=0, Total=380 [2021-10-11 02:23:28,405 INFO L87 Difference]: Start difference. First operand 97 states and 146 transitions. Second operand 20 states. [2021-10-11 02:23:28,735 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-11 02:23:28,735 INFO L93 Difference]: Finished difference Result 140 states and 243 transitions. [2021-10-11 02:23:28,736 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-10-11 02:23:28,736 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 187 [2021-10-11 02:23:28,736 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-11 02:23:28,738 INFO L225 Difference]: With dead ends: 140 [2021-10-11 02:23:28,738 INFO L226 Difference]: Without dead ends: 111 [2021-10-11 02:23:28,739 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 393 GetRequests, 367 SyntacticMatches, 2 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 125 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=138, Invalid=512, Unknown=0, NotChecked=0, Total=650 [2021-10-11 02:23:28,739 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 111 states. [2021-10-11 02:23:28,754 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 111 to 111. [2021-10-11 02:23:28,754 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 111 states. [2021-10-11 02:23:28,756 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 111 states to 111 states and 158 transitions. [2021-10-11 02:23:28,756 INFO L78 Accepts]: Start accepts. Automaton has 111 states and 158 transitions. Word has length 187 [2021-10-11 02:23:28,757 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-11 02:23:28,757 INFO L481 AbstractCegarLoop]: Abstraction has 111 states and 158 transitions. [2021-10-11 02:23:28,757 INFO L482 AbstractCegarLoop]: Interpolant automaton has 20 states. [2021-10-11 02:23:28,757 INFO L276 IsEmpty]: Start isEmpty. Operand 111 states and 158 transitions. [2021-10-11 02:23:28,760 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 161 [2021-10-11 02:23:28,760 INFO L414 BasicCegarLoop]: Found error trace [2021-10-11 02:23:28,760 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 11, 11, 10, 9, 6, 6, 6, 6, 6, 6, 6, 5, 5, 5, 5, 5, 5, 5, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1] [2021-10-11 02:23:28,985 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable38 [2021-10-11 02:23:28,985 INFO L429 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-10-11 02:23:28,985 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-11 02:23:28,985 INFO L82 PathProgramCache]: Analyzing trace with hash -1349694605, now seen corresponding path program 2 times [2021-10-11 02:23:28,985 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-11 02:23:28,986 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1137997509] [2021-10-11 02:23:28,986 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-11 02:23:29,024 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-11 02:23:29,178 INFO L134 CoverageAnalysis]: Checked inductivity of 665 backedges. 83 proven. 156 refuted. 0 times theorem prover too weak. 426 trivial. 0 not checked. [2021-10-11 02:23:29,178 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1137997509] [2021-10-11 02:23:29,178 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1931704215] [2021-10-11 02:23:29,179 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7490f43b-da53-4754-a858-e7f75e557a3d/bin/utaipan-WLngWcDbfI/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-11 02:23:29,334 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2021-10-11 02:23:29,334 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-11 02:23:29,336 INFO L263 TraceCheckSpWp]: Trace formula consists of 295 conjuncts, 10 conjunts are in the unsatisfiable core [2021-10-11 02:23:29,339 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-11 02:23:29,586 INFO L134 CoverageAnalysis]: Checked inductivity of 665 backedges. 85 proven. 108 refuted. 0 times theorem prover too weak. 472 trivial. 0 not checked. [2021-10-11 02:23:29,586 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-11 02:23:30,516 INFO L134 CoverageAnalysis]: Checked inductivity of 665 backedges. 85 proven. 112 refuted. 0 times theorem prover too weak. 468 trivial. 0 not checked. [2021-10-11 02:23:30,516 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [20300447] [2021-10-11 02:23:30,518 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2021-10-11 02:23:30,518 INFO L166 IcfgInterpreter]: Building call graph [2021-10-11 02:23:30,519 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:289) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:189) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:179) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:84) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:74) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:511) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterateInternal(AbstractCegarLoop.java:438) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:372) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopResult.iterate(CegarLoopResult.java:138) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.iterateNew(TraceAbstractionStarter.java:345) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:198) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-10-11 02:23:30,520 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-10-11 02:23:30,520 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9, 11] total 21 [2021-10-11 02:23:30,521 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [460160792] [2021-10-11 02:23:30,521 INFO L461 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-10-11 02:23:30,522 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-10-11 02:23:30,522 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-10-11 02:23:30,522 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=365, Unknown=0, NotChecked=0, Total=420 [2021-10-11 02:23:30,523 INFO L87 Difference]: Start difference. First operand 111 states and 158 transitions. Second operand 21 states. [2021-10-11 02:23:31,438 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-11 02:23:31,439 INFO L93 Difference]: Finished difference Result 347 states and 699 transitions. [2021-10-11 02:23:31,439 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-10-11 02:23:31,439 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 160 [2021-10-11 02:23:31,439 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-11 02:23:31,441 INFO L225 Difference]: With dead ends: 347 [2021-10-11 02:23:31,441 INFO L226 Difference]: Without dead ends: 187 [2021-10-11 02:23:31,446 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 350 GetRequests, 312 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 251 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=228, Invalid=1332, Unknown=0, NotChecked=0, Total=1560 [2021-10-11 02:23:31,446 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 187 states. [2021-10-11 02:23:31,470 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 187 to 150. [2021-10-11 02:23:31,470 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 150 states. [2021-10-11 02:23:31,473 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 150 states to 150 states and 219 transitions. [2021-10-11 02:23:31,473 INFO L78 Accepts]: Start accepts. Automaton has 150 states and 219 transitions. Word has length 160 [2021-10-11 02:23:31,473 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-11 02:23:31,474 INFO L481 AbstractCegarLoop]: Abstraction has 150 states and 219 transitions. [2021-10-11 02:23:31,474 INFO L482 AbstractCegarLoop]: Interpolant automaton has 21 states. [2021-10-11 02:23:31,474 INFO L276 IsEmpty]: Start isEmpty. Operand 150 states and 219 transitions. [2021-10-11 02:23:31,477 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 162 [2021-10-11 02:23:31,477 INFO L414 BasicCegarLoop]: Found error trace [2021-10-11 02:23:31,477 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 11, 11, 11, 9, 6, 6, 6, 6, 6, 6, 6, 6, 5, 5, 5, 5, 5, 5, 5, 3, 2, 1, 1, 1, 1, 1, 1, 1] [2021-10-11 02:23:31,696 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable39 [2021-10-11 02:23:31,697 INFO L429 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-10-11 02:23:31,697 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-11 02:23:31,697 INFO L82 PathProgramCache]: Analyzing trace with hash -323855901, now seen corresponding path program 3 times [2021-10-11 02:23:31,697 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-11 02:23:31,697 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1245092364] [2021-10-11 02:23:31,697 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-11 02:23:31,719 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-11 02:23:31,810 INFO L134 CoverageAnalysis]: Checked inductivity of 675 backedges. 84 proven. 117 refuted. 0 times theorem prover too weak. 474 trivial. 0 not checked. [2021-10-11 02:23:31,810 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1245092364] [2021-10-11 02:23:31,811 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1965257168] [2021-10-11 02:23:31,811 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7490f43b-da53-4754-a858-e7f75e557a3d/bin/utaipan-WLngWcDbfI/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-11 02:23:31,957 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-10-11 02:23:31,957 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-11 02:23:31,959 INFO L263 TraceCheckSpWp]: Trace formula consists of 287 conjuncts, 14 conjunts are in the unsatisfiable core [2021-10-11 02:23:31,962 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-11 02:23:32,241 INFO L134 CoverageAnalysis]: Checked inductivity of 675 backedges. 416 proven. 71 refuted. 0 times theorem prover too weak. 188 trivial. 0 not checked. [2021-10-11 02:23:32,241 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-11 02:23:33,701 INFO L134 CoverageAnalysis]: Checked inductivity of 675 backedges. 96 proven. 232 refuted. 0 times theorem prover too weak. 347 trivial. 0 not checked. [2021-10-11 02:23:33,702 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [512161055] [2021-10-11 02:23:33,704 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2021-10-11 02:23:33,704 INFO L166 IcfgInterpreter]: Building call graph [2021-10-11 02:23:33,704 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:289) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:189) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:179) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:84) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:74) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:511) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterateInternal(AbstractCegarLoop.java:438) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:372) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopResult.iterate(CegarLoopResult.java:138) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.iterateNew(TraceAbstractionStarter.java:345) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:198) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-10-11 02:23:33,705 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-10-11 02:23:33,706 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 13, 15] total 22 [2021-10-11 02:23:33,706 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [406879787] [2021-10-11 02:23:33,707 INFO L461 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-10-11 02:23:33,707 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-10-11 02:23:33,707 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-10-11 02:23:33,708 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=402, Unknown=0, NotChecked=0, Total=462 [2021-10-11 02:23:33,708 INFO L87 Difference]: Start difference. First operand 150 states and 219 transitions. Second operand 22 states. [2021-10-11 02:23:34,599 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-11 02:23:34,599 INFO L93 Difference]: Finished difference Result 296 states and 454 transitions. [2021-10-11 02:23:34,600 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-10-11 02:23:34,600 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 161 [2021-10-11 02:23:34,600 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-11 02:23:34,605 INFO L225 Difference]: With dead ends: 296 [2021-10-11 02:23:34,606 INFO L226 Difference]: Without dead ends: 139 [2021-10-11 02:23:34,608 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 349 GetRequests, 309 SyntacticMatches, 2 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 232 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=259, Invalid=1301, Unknown=0, NotChecked=0, Total=1560 [2021-10-11 02:23:34,609 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 139 states. [2021-10-11 02:23:34,622 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 139 to 119. [2021-10-11 02:23:34,622 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 119 states. [2021-10-11 02:23:34,624 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 119 states to 119 states and 155 transitions. [2021-10-11 02:23:34,625 INFO L78 Accepts]: Start accepts. Automaton has 119 states and 155 transitions. Word has length 161 [2021-10-11 02:23:34,627 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-11 02:23:34,627 INFO L481 AbstractCegarLoop]: Abstraction has 119 states and 155 transitions. [2021-10-11 02:23:34,627 INFO L482 AbstractCegarLoop]: Interpolant automaton has 22 states. [2021-10-11 02:23:34,627 INFO L276 IsEmpty]: Start isEmpty. Operand 119 states and 155 transitions. [2021-10-11 02:23:34,633 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 215 [2021-10-11 02:23:34,634 INFO L414 BasicCegarLoop]: Found error trace [2021-10-11 02:23:34,634 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 14, 14, 13, 12, 8, 8, 8, 8, 8, 8, 8, 7, 7, 7, 7, 7, 7, 7, 6, 4, 4, 2, 1, 1, 1, 1, 1, 1] [2021-10-11 02:23:34,845 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable40 [2021-10-11 02:23:34,845 INFO L429 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-10-11 02:23:34,845 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-11 02:23:34,845 INFO L82 PathProgramCache]: Analyzing trace with hash -2104713271, now seen corresponding path program 4 times [2021-10-11 02:23:34,845 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-11 02:23:34,845 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1225700142] [2021-10-11 02:23:34,845 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-11 02:23:34,889 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-11 02:23:35,039 INFO L134 CoverageAnalysis]: Checked inductivity of 1248 backedges. 216 proven. 87 refuted. 0 times theorem prover too weak. 945 trivial. 0 not checked. [2021-10-11 02:23:35,039 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1225700142] [2021-10-11 02:23:35,039 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1293816736] [2021-10-11 02:23:35,039 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7490f43b-da53-4754-a858-e7f75e557a3d/bin/utaipan-WLngWcDbfI/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-11 02:23:35,212 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-11 02:23:35,214 INFO L263 TraceCheckSpWp]: Trace formula consists of 506 conjuncts, 14 conjunts are in the unsatisfiable core [2021-10-11 02:23:35,219 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-11 02:23:35,525 INFO L134 CoverageAnalysis]: Checked inductivity of 1248 backedges. 275 proven. 129 refuted. 0 times theorem prover too weak. 844 trivial. 0 not checked. [2021-10-11 02:23:35,526 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-11 02:23:37,131 INFO L134 CoverageAnalysis]: Checked inductivity of 1248 backedges. 275 proven. 143 refuted. 0 times theorem prover too weak. 830 trivial. 0 not checked. [2021-10-11 02:23:37,131 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [154746863] [2021-10-11 02:23:37,133 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2021-10-11 02:23:37,133 INFO L166 IcfgInterpreter]: Building call graph [2021-10-11 02:23:37,133 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:289) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:189) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:179) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:84) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:74) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:511) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterateInternal(AbstractCegarLoop.java:438) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:372) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopResult.iterate(CegarLoopResult.java:138) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.iterateNew(TraceAbstractionStarter.java:345) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:198) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-10-11 02:23:37,134 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-10-11 02:23:37,134 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11, 15] total 21 [2021-10-11 02:23:37,134 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [446671509] [2021-10-11 02:23:37,135 INFO L461 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-10-11 02:23:37,135 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-10-11 02:23:37,135 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-10-11 02:23:37,136 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=339, Unknown=0, NotChecked=0, Total=420 [2021-10-11 02:23:37,136 INFO L87 Difference]: Start difference. First operand 119 states and 155 transitions. Second operand 21 states. [2021-10-11 02:23:37,480 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-11 02:23:37,481 INFO L93 Difference]: Finished difference Result 126 states and 161 transitions. [2021-10-11 02:23:37,481 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-10-11 02:23:37,481 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 214 [2021-10-11 02:23:37,483 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-11 02:23:37,483 INFO L225 Difference]: With dead ends: 126 [2021-10-11 02:23:37,484 INFO L226 Difference]: Without dead ends: 119 [2021-10-11 02:23:37,484 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 445 GetRequests, 418 SyntacticMatches, 2 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 146 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=146, Invalid=556, Unknown=0, NotChecked=0, Total=702 [2021-10-11 02:23:37,485 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 119 states. [2021-10-11 02:23:37,492 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 119 to 119. [2021-10-11 02:23:37,492 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 119 states. [2021-10-11 02:23:37,493 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 119 states to 119 states and 153 transitions. [2021-10-11 02:23:37,494 INFO L78 Accepts]: Start accepts. Automaton has 119 states and 153 transitions. Word has length 214 [2021-10-11 02:23:37,494 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-11 02:23:37,494 INFO L481 AbstractCegarLoop]: Abstraction has 119 states and 153 transitions. [2021-10-11 02:23:37,495 INFO L482 AbstractCegarLoop]: Interpolant automaton has 21 states. [2021-10-11 02:23:37,495 INFO L276 IsEmpty]: Start isEmpty. Operand 119 states and 153 transitions. [2021-10-11 02:23:37,496 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 147 [2021-10-11 02:23:37,496 INFO L414 BasicCegarLoop]: Found error trace [2021-10-11 02:23:37,497 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 10, 10, 9, 8, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 3, 2, 2, 1, 1, 1, 1, 1, 1] [2021-10-11 02:23:37,711 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41,13 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-11 02:23:37,711 INFO L429 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-10-11 02:23:37,711 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-11 02:23:37,712 INFO L82 PathProgramCache]: Analyzing trace with hash 1699641540, now seen corresponding path program 5 times [2021-10-11 02:23:37,712 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-11 02:23:37,712 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1619265948] [2021-10-11 02:23:37,713 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-11 02:23:37,740 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-11 02:23:37,812 INFO L134 CoverageAnalysis]: Checked inductivity of 544 backedges. 109 proven. 27 refuted. 0 times theorem prover too weak. 408 trivial. 0 not checked. [2021-10-11 02:23:37,812 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1619265948] [2021-10-11 02:23:37,812 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1274090251] [2021-10-11 02:23:37,813 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7490f43b-da53-4754-a858-e7f75e557a3d/bin/utaipan-WLngWcDbfI/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-11 02:23:37,979 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-10-11 02:23:37,979 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-11 02:23:37,980 INFO L263 TraceCheckSpWp]: Trace formula consists of 143 conjuncts, 8 conjunts are in the unsatisfiable core [2021-10-11 02:23:37,983 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-11 02:23:38,126 INFO L134 CoverageAnalysis]: Checked inductivity of 544 backedges. 109 proven. 27 refuted. 0 times theorem prover too weak. 408 trivial. 0 not checked. [2021-10-11 02:23:38,126 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-11 02:23:38,691 INFO L134 CoverageAnalysis]: Checked inductivity of 544 backedges. 109 proven. 29 refuted. 0 times theorem prover too weak. 406 trivial. 0 not checked. [2021-10-11 02:23:38,692 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [265402318] [2021-10-11 02:23:38,694 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2021-10-11 02:23:38,694 INFO L166 IcfgInterpreter]: Building call graph [2021-10-11 02:23:38,694 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:289) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:189) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:179) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:84) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:74) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:511) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterateInternal(AbstractCegarLoop.java:438) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:372) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopResult.iterate(CegarLoopResult.java:138) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.iterateNew(TraceAbstractionStarter.java:345) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:198) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-10-11 02:23:38,694 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-10-11 02:23:38,695 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 9] total 11 [2021-10-11 02:23:38,695 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [331780663] [2021-10-11 02:23:38,695 INFO L461 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-10-11 02:23:38,695 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-10-11 02:23:38,696 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-10-11 02:23:38,696 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2021-10-11 02:23:38,696 INFO L87 Difference]: Start difference. First operand 119 states and 153 transitions. Second operand 11 states. [2021-10-11 02:23:38,836 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-11 02:23:38,836 INFO L93 Difference]: Finished difference Result 131 states and 167 transitions. [2021-10-11 02:23:38,837 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-10-11 02:23:38,837 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 146 [2021-10-11 02:23:38,838 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-11 02:23:38,839 INFO L225 Difference]: With dead ends: 131 [2021-10-11 02:23:38,839 INFO L226 Difference]: Without dead ends: 124 [2021-10-11 02:23:38,842 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 302 GetRequests, 288 SyntacticMatches, 2 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=46, Invalid=136, Unknown=0, NotChecked=0, Total=182 [2021-10-11 02:23:38,843 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2021-10-11 02:23:38,854 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 122. [2021-10-11 02:23:38,854 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 122 states. [2021-10-11 02:23:38,857 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 122 states to 122 states and 156 transitions. [2021-10-11 02:23:38,857 INFO L78 Accepts]: Start accepts. Automaton has 122 states and 156 transitions. Word has length 146 [2021-10-11 02:23:38,858 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-11 02:23:38,858 INFO L481 AbstractCegarLoop]: Abstraction has 122 states and 156 transitions. [2021-10-11 02:23:38,859 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2021-10-11 02:23:38,859 INFO L276 IsEmpty]: Start isEmpty. Operand 122 states and 156 transitions. [2021-10-11 02:23:38,861 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 175 [2021-10-11 02:23:38,861 INFO L414 BasicCegarLoop]: Found error trace [2021-10-11 02:23:38,861 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 12, 12, 11, 10, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 5, 4, 2, 2, 1, 1, 1, 1, 1, 1] [2021-10-11 02:23:39,085 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable42 [2021-10-11 02:23:39,085 INFO L429 AbstractCegarLoop]: === Iteration 16 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-10-11 02:23:39,085 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-11 02:23:39,085 INFO L82 PathProgramCache]: Analyzing trace with hash -1503056138, now seen corresponding path program 6 times [2021-10-11 02:23:39,085 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-11 02:23:39,086 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1155269327] [2021-10-11 02:23:39,086 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-11 02:23:39,115 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-11 02:23:39,220 INFO L134 CoverageAnalysis]: Checked inductivity of 796 backedges. 210 proven. 60 refuted. 0 times theorem prover too weak. 526 trivial. 0 not checked. [2021-10-11 02:23:39,220 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1155269327] [2021-10-11 02:23:39,220 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [879013239] [2021-10-11 02:23:39,221 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7490f43b-da53-4754-a858-e7f75e557a3d/bin/utaipan-WLngWcDbfI/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-11 02:23:39,393 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-10-11 02:23:39,393 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-11 02:23:39,394 INFO L263 TraceCheckSpWp]: Trace formula consists of 310 conjuncts, 20 conjunts are in the unsatisfiable core [2021-10-11 02:23:39,398 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-11 02:23:39,731 INFO L134 CoverageAnalysis]: Checked inductivity of 796 backedges. 173 proven. 269 refuted. 0 times theorem prover too weak. 354 trivial. 0 not checked. [2021-10-11 02:23:39,731 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-11 02:23:41,914 INFO L134 CoverageAnalysis]: Checked inductivity of 796 backedges. 175 proven. 281 refuted. 0 times theorem prover too weak. 340 trivial. 0 not checked. [2021-10-11 02:23:41,914 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [78942059] [2021-10-11 02:23:41,925 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2021-10-11 02:23:41,926 INFO L166 IcfgInterpreter]: Building call graph [2021-10-11 02:23:41,927 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:289) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:189) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:179) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:84) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:74) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:511) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterateInternal(AbstractCegarLoop.java:438) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:372) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopResult.iterate(CegarLoopResult.java:138) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.iterateNew(TraceAbstractionStarter.java:345) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:198) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-10-11 02:23:41,928 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-10-11 02:23:41,928 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 16, 21] total 27 [2021-10-11 02:23:41,928 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [318080302] [2021-10-11 02:23:41,929 INFO L461 AbstractCegarLoop]: Interpolant automaton has 27 states [2021-10-11 02:23:41,929 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-10-11 02:23:41,929 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-10-11 02:23:41,930 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=85, Invalid=617, Unknown=0, NotChecked=0, Total=702 [2021-10-11 02:23:41,930 INFO L87 Difference]: Start difference. First operand 122 states and 156 transitions. Second operand 27 states. [2021-10-11 02:23:42,784 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-11 02:23:42,784 INFO L93 Difference]: Finished difference Result 295 states and 429 transitions. [2021-10-11 02:23:42,785 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-10-11 02:23:42,802 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 174 [2021-10-11 02:23:42,803 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-11 02:23:42,805 INFO L225 Difference]: With dead ends: 295 [2021-10-11 02:23:42,805 INFO L226 Difference]: Without dead ends: 173 [2021-10-11 02:23:42,807 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 377 GetRequests, 332 SyntacticMatches, 2 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 296 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=316, Invalid=1664, Unknown=0, NotChecked=0, Total=1980 [2021-10-11 02:23:42,807 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 173 states. [2021-10-11 02:23:42,817 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 173 to 149. [2021-10-11 02:23:42,817 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 149 states. [2021-10-11 02:23:42,819 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 149 states to 149 states and 199 transitions. [2021-10-11 02:23:42,819 INFO L78 Accepts]: Start accepts. Automaton has 149 states and 199 transitions. Word has length 174 [2021-10-11 02:23:42,820 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-11 02:23:42,820 INFO L481 AbstractCegarLoop]: Abstraction has 149 states and 199 transitions. [2021-10-11 02:23:42,820 INFO L482 AbstractCegarLoop]: Interpolant automaton has 27 states. [2021-10-11 02:23:42,820 INFO L276 IsEmpty]: Start isEmpty. Operand 149 states and 199 transitions. [2021-10-11 02:23:42,821 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 187 [2021-10-11 02:23:42,822 INFO L414 BasicCegarLoop]: Found error trace [2021-10-11 02:23:42,822 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 13, 13, 11, 10, 7, 7, 7, 7, 7, 7, 7, 6, 6, 6, 6, 6, 6, 6, 5, 3, 3, 3, 1, 1, 1, 1, 1, 1] [2021-10-11 02:23:43,033 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable43,15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-11 02:23:43,033 INFO L429 AbstractCegarLoop]: === Iteration 17 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-10-11 02:23:43,033 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-11 02:23:43,033 INFO L82 PathProgramCache]: Analyzing trace with hash 1397542685, now seen corresponding path program 7 times [2021-10-11 02:23:43,033 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-11 02:23:43,034 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1335488365] [2021-10-11 02:23:43,035 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-11 02:23:43,079 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-11 02:23:43,231 INFO L134 CoverageAnalysis]: Checked inductivity of 920 backedges. 104 proven. 203 refuted. 0 times theorem prover too weak. 613 trivial. 0 not checked. [2021-10-11 02:23:43,232 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1335488365] [2021-10-11 02:23:43,232 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [545696472] [2021-10-11 02:23:43,232 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7490f43b-da53-4754-a858-e7f75e557a3d/bin/utaipan-WLngWcDbfI/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-11 02:23:43,416 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-11 02:23:43,417 INFO L263 TraceCheckSpWp]: Trace formula consists of 444 conjuncts, 16 conjunts are in the unsatisfiable core [2021-10-11 02:23:43,420 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-11 02:23:43,656 INFO L134 CoverageAnalysis]: Checked inductivity of 920 backedges. 97 proven. 281 refuted. 0 times theorem prover too weak. 542 trivial. 0 not checked. [2021-10-11 02:23:43,656 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-11 02:23:45,724 INFO L134 CoverageAnalysis]: Checked inductivity of 920 backedges. 97 proven. 302 refuted. 0 times theorem prover too weak. 521 trivial. 0 not checked. [2021-10-11 02:23:45,725 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1398563752] [2021-10-11 02:23:45,726 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2021-10-11 02:23:45,727 INFO L166 IcfgInterpreter]: Building call graph [2021-10-11 02:23:45,727 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:289) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:189) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:179) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:84) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:74) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:511) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterateInternal(AbstractCegarLoop.java:438) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:372) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopResult.iterate(CegarLoopResult.java:138) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.iterateNew(TraceAbstractionStarter.java:345) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:198) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-10-11 02:23:45,728 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-10-11 02:23:45,728 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12, 17] total 23 [2021-10-11 02:23:45,729 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1640643329] [2021-10-11 02:23:45,729 INFO L461 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-10-11 02:23:45,730 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-10-11 02:23:45,730 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-10-11 02:23:45,730 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=409, Unknown=0, NotChecked=0, Total=506 [2021-10-11 02:23:45,731 INFO L87 Difference]: Start difference. First operand 149 states and 199 transitions. Second operand 23 states. [2021-10-11 02:23:46,071 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-11 02:23:46,071 INFO L93 Difference]: Finished difference Result 173 states and 231 transitions. [2021-10-11 02:23:46,072 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-10-11 02:23:46,072 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 186 [2021-10-11 02:23:46,073 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-11 02:23:46,074 INFO L225 Difference]: With dead ends: 173 [2021-10-11 02:23:46,074 INFO L226 Difference]: Without dead ends: 117 [2021-10-11 02:23:46,076 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 392 GetRequests, 362 SyntacticMatches, 2 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 189 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=183, Invalid=687, Unknown=0, NotChecked=0, Total=870 [2021-10-11 02:23:46,076 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 117 states. [2021-10-11 02:23:46,082 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 117 to 114. [2021-10-11 02:23:46,082 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 114 states. [2021-10-11 02:23:46,083 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 114 states to 114 states and 135 transitions. [2021-10-11 02:23:46,084 INFO L78 Accepts]: Start accepts. Automaton has 114 states and 135 transitions. Word has length 186 [2021-10-11 02:23:46,084 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-11 02:23:46,084 INFO L481 AbstractCegarLoop]: Abstraction has 114 states and 135 transitions. [2021-10-11 02:23:46,084 INFO L482 AbstractCegarLoop]: Interpolant automaton has 23 states. [2021-10-11 02:23:46,084 INFO L276 IsEmpty]: Start isEmpty. Operand 114 states and 135 transitions. [2021-10-11 02:23:46,085 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 160 [2021-10-11 02:23:46,086 INFO L414 BasicCegarLoop]: Found error trace [2021-10-11 02:23:46,086 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 11, 11, 9, 9, 6, 6, 6, 6, 6, 6, 6, 5, 5, 5, 5, 5, 5, 5, 4, 3, 3, 2, 1, 1, 1, 1, 1, 1] [2021-10-11 02:23:46,313 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable44 [2021-10-11 02:23:46,313 INFO L429 AbstractCegarLoop]: === Iteration 18 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-10-11 02:23:46,313 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-11 02:23:46,313 INFO L82 PathProgramCache]: Analyzing trace with hash -2138535681, now seen corresponding path program 8 times [2021-10-11 02:23:46,313 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-11 02:23:46,313 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [861540381] [2021-10-11 02:23:46,313 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-11 02:23:46,337 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-11 02:23:46,418 INFO L134 CoverageAnalysis]: Checked inductivity of 656 backedges. 146 proven. 51 refuted. 0 times theorem prover too weak. 459 trivial. 0 not checked. [2021-10-11 02:23:46,419 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [861540381] [2021-10-11 02:23:46,419 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1746063884] [2021-10-11 02:23:46,419 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7490f43b-da53-4754-a858-e7f75e557a3d/bin/utaipan-WLngWcDbfI/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-11 02:23:46,626 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-10-11 02:23:46,627 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-11 02:23:46,627 INFO L263 TraceCheckSpWp]: Trace formula consists of 172 conjuncts, 10 conjunts are in the unsatisfiable core [2021-10-11 02:23:46,629 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-11 02:23:46,811 INFO L134 CoverageAnalysis]: Checked inductivity of 656 backedges. 214 proven. 21 refuted. 0 times theorem prover too weak. 421 trivial. 0 not checked. [2021-10-11 02:23:46,811 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-11 02:23:47,652 INFO L134 CoverageAnalysis]: Checked inductivity of 656 backedges. 214 proven. 21 refuted. 0 times theorem prover too weak. 421 trivial. 0 not checked. [2021-10-11 02:23:47,653 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1411114751] [2021-10-11 02:23:47,655 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2021-10-11 02:23:47,656 INFO L166 IcfgInterpreter]: Building call graph [2021-10-11 02:23:47,657 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:289) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:189) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:179) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:84) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:74) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:511) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterateInternal(AbstractCegarLoop.java:438) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:372) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopResult.iterate(CegarLoopResult.java:138) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.iterateNew(TraceAbstractionStarter.java:345) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:198) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-10-11 02:23:47,658 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-10-11 02:23:47,658 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11, 11] total 18 [2021-10-11 02:23:47,659 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1369101123] [2021-10-11 02:23:47,660 INFO L461 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-10-11 02:23:47,660 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-10-11 02:23:47,661 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-10-11 02:23:47,661 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=263, Unknown=0, NotChecked=0, Total=306 [2021-10-11 02:23:47,662 INFO L87 Difference]: Start difference. First operand 114 states and 135 transitions. Second operand 18 states. [2021-10-11 02:23:48,170 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-11 02:23:48,170 INFO L93 Difference]: Finished difference Result 137 states and 161 transitions. [2021-10-11 02:23:48,171 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-10-11 02:23:48,171 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 159 [2021-10-11 02:23:48,172 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-11 02:23:48,174 INFO L225 Difference]: With dead ends: 137 [2021-10-11 02:23:48,174 INFO L226 Difference]: Without dead ends: 115 [2021-10-11 02:23:48,175 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 338 GetRequests, 309 SyntacticMatches, 2 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 74 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=150, Invalid=662, Unknown=0, NotChecked=0, Total=812 [2021-10-11 02:23:48,175 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 115 states. [2021-10-11 02:23:48,181 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 115 to 103. [2021-10-11 02:23:48,181 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 103 states. [2021-10-11 02:23:48,182 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 116 transitions. [2021-10-11 02:23:48,182 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 116 transitions. Word has length 159 [2021-10-11 02:23:48,182 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-11 02:23:48,182 INFO L481 AbstractCegarLoop]: Abstraction has 103 states and 116 transitions. [2021-10-11 02:23:48,182 INFO L482 AbstractCegarLoop]: Interpolant automaton has 18 states. [2021-10-11 02:23:48,182 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 116 transitions. [2021-10-11 02:23:48,183 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 174 [2021-10-11 02:23:48,183 INFO L414 BasicCegarLoop]: Found error trace [2021-10-11 02:23:48,183 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 12, 12, 10, 10, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 4, 4, 3, 2, 1, 1, 1, 1, 1, 1] [2021-10-11 02:23:48,383 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable45,17 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-11 02:23:48,384 INFO L429 AbstractCegarLoop]: === Iteration 19 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-10-11 02:23:48,384 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-11 02:23:48,384 INFO L82 PathProgramCache]: Analyzing trace with hash 1451526342, now seen corresponding path program 9 times [2021-10-11 02:23:48,384 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-11 02:23:48,384 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [957580364] [2021-10-11 02:23:48,384 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-11 02:23:48,409 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-11 02:23:49,087 INFO L134 CoverageAnalysis]: Checked inductivity of 786 backedges. 0 proven. 267 refuted. 0 times theorem prover too weak. 519 trivial. 0 not checked. [2021-10-11 02:23:49,087 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [957580364] [2021-10-11 02:23:49,088 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [489233817] [2021-10-11 02:23:49,088 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7490f43b-da53-4754-a858-e7f75e557a3d/bin/utaipan-WLngWcDbfI/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-11 02:23:49,309 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-10-11 02:23:49,309 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-11 02:23:49,312 INFO L263 TraceCheckSpWp]: Trace formula consists of 415 conjuncts, 103 conjunts are in the unsatisfiable core [2021-10-11 02:23:49,315 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-11 02:23:49,867 INFO L134 CoverageAnalysis]: Checked inductivity of 786 backedges. 0 proven. 267 refuted. 0 times theorem prover too weak. 519 trivial. 0 not checked. [2021-10-11 02:23:49,868 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-11 02:23:51,827 INFO L134 CoverageAnalysis]: Checked inductivity of 786 backedges. 0 proven. 267 refuted. 0 times theorem prover too weak. 519 trivial. 0 not checked. [2021-10-11 02:23:51,828 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [236281481] [2021-10-11 02:23:51,829 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2021-10-11 02:23:51,829 INFO L166 IcfgInterpreter]: Building call graph [2021-10-11 02:23:51,830 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:289) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:189) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:179) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:84) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:74) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:511) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterateInternal(AbstractCegarLoop.java:438) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:372) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopResult.iterate(CegarLoopResult.java:138) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.iterateNew(TraceAbstractionStarter.java:345) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:198) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-10-11 02:23:51,831 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-10-11 02:23:51,831 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28] total 36 [2021-10-11 02:23:51,831 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [246981446] [2021-10-11 02:23:51,831 INFO L461 AbstractCegarLoop]: Interpolant automaton has 36 states [2021-10-11 02:23:51,832 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-10-11 02:23:51,832 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2021-10-11 02:23:51,833 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=85, Invalid=1175, Unknown=0, NotChecked=0, Total=1260 [2021-10-11 02:23:51,833 INFO L87 Difference]: Start difference. First operand 103 states and 116 transitions. Second operand 36 states. [2021-10-11 02:23:52,163 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-11 02:23:52,163 INFO L93 Difference]: Finished difference Result 103 states and 116 transitions. [2021-10-11 02:23:52,164 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-10-11 02:23:52,164 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 173 [2021-10-11 02:23:52,166 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-11 02:23:52,166 INFO L225 Difference]: With dead ends: 103 [2021-10-11 02:23:52,166 INFO L226 Difference]: Without dead ends: 0 [2021-10-11 02:23:52,167 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 397 GetRequests, 321 SyntacticMatches, 42 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 240 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=85, Invalid=1175, Unknown=0, NotChecked=0, Total=1260 [2021-10-11 02:23:52,167 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2021-10-11 02:23:52,168 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2021-10-11 02:23:52,168 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2021-10-11 02:23:52,168 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2021-10-11 02:23:52,168 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 173 [2021-10-11 02:23:52,168 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-11 02:23:52,169 INFO L481 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2021-10-11 02:23:52,169 INFO L482 AbstractCegarLoop]: Interpolant automaton has 36 states. [2021-10-11 02:23:52,169 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2021-10-11 02:23:52,169 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2021-10-11 02:23:52,389 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable46 [2021-10-11 02:23:52,390 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2021-10-11 02:23:54,400 WARN L197 SmtUtils]: Spent 724.00 ms on a formula simplification. DAG size of input: 120 DAG size of output: 28 [2021-10-11 02:23:54,647 WARN L197 SmtUtils]: Spent 203.00 ms on a formula simplification. DAG size of input: 87 DAG size of output: 8 [2021-10-11 02:23:54,799 WARN L197 SmtUtils]: Spent 147.00 ms on a formula simplification. DAG size of input: 89 DAG size of output: 1 [2021-10-11 02:23:55,535 WARN L197 SmtUtils]: Spent 726.00 ms on a formula simplification. DAG size of input: 151 DAG size of output: 17 [2021-10-11 02:23:55,785 WARN L197 SmtUtils]: Spent 246.00 ms on a formula simplification. DAG size of input: 97 DAG size of output: 8 [2021-10-11 02:23:55,787 INFO L262 CegarLoopResult]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2021-10-11 02:23:55,788 INFO L262 CegarLoopResult]: For program point ULTIMATE.startENTRY(line -1) no Hoare annotation was computed. [2021-10-11 02:23:55,788 INFO L262 CegarLoopResult]: For program point ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION(line 41) no Hoare annotation was computed. [2021-10-11 02:23:55,788 INFO L262 CegarLoopResult]: For program point L41(line 41) no Hoare annotation was computed. [2021-10-11 02:23:55,788 INFO L262 CegarLoopResult]: For program point L40(lines 40 42) no Hoare annotation was computed. [2021-10-11 02:23:55,788 INFO L258 CegarLoopResult]: At program point L39(line 39) the Hoare annotation is: (and (<= ULTIMATE.start_main_~x~0 6) (<= 6 ULTIMATE.start_main_~x~0)) [2021-10-11 02:23:55,788 INFO L262 CegarLoopResult]: For program point L39-1(line 39) no Hoare annotation was computed. [2021-10-11 02:23:55,788 INFO L258 CegarLoopResult]: At program point L40-2(lines 40 42) the Hoare annotation is: (<= 6 ULTIMATE.start_main_~x~0) [2021-10-11 02:23:55,788 INFO L265 CegarLoopResult]: At program point fibo2ENTRY(lines 19 27) the Hoare annotation is: true [2021-10-11 02:23:55,789 INFO L258 CegarLoopResult]: At program point L25(line 25) the Hoare annotation is: (and (<= |fibo2_#in~n| fibo2_~n) (< 1 fibo2_~n) (<= fibo2_~n |fibo2_#in~n|)) [2021-10-11 02:23:55,789 INFO L262 CegarLoopResult]: For program point L25-1(line 25) no Hoare annotation was computed. [2021-10-11 02:23:55,789 INFO L258 CegarLoopResult]: At program point L25-2(line 25) the Hoare annotation is: (and (or (<= |fibo2_#in~n| 4) (and (<= |fibo2_#t~ret9| 3) (<= 3 |fibo2_#t~ret9|)) (<= 6 |fibo2_#in~n|)) (<= |fibo2_#in~n| fibo2_~n) (or (<= fibo2_~n 3) (<= 5 fibo2_~n)) (or (and (<= |fibo2_#t~ret9| 1) (<= 1 |fibo2_#t~ret9|)) (not (< |fibo2_#in~n| 5))) (< 1 fibo2_~n) (<= fibo2_~n |fibo2_#in~n|)) [2021-10-11 02:23:55,789 INFO L262 CegarLoopResult]: For program point L22(lines 22 26) no Hoare annotation was computed. [2021-10-11 02:23:55,789 INFO L262 CegarLoopResult]: For program point L25-3(line 25) no Hoare annotation was computed. [2021-10-11 02:23:55,789 INFO L262 CegarLoopResult]: For program point L20(lines 20 26) no Hoare annotation was computed. [2021-10-11 02:23:55,789 INFO L262 CegarLoopResult]: For program point fibo2FINAL(lines 19 27) no Hoare annotation was computed. [2021-10-11 02:23:55,790 INFO L262 CegarLoopResult]: For program point fibo2EXIT(lines 19 27) no Hoare annotation was computed. [2021-10-11 02:23:55,790 INFO L265 CegarLoopResult]: At program point fibo1ENTRY(lines 9 17) the Hoare annotation is: true [2021-10-11 02:23:55,790 INFO L258 CegarLoopResult]: At program point L15(line 15) the Hoare annotation is: (and (not (<= |fibo1_#in~n| 4)) (<= |fibo1_#in~n| fibo1_~n) (<= fibo1_~n |fibo1_#in~n|)) [2021-10-11 02:23:55,790 INFO L262 CegarLoopResult]: For program point L15-1(line 15) no Hoare annotation was computed. [2021-10-11 02:23:55,790 INFO L258 CegarLoopResult]: At program point L15-2(line 15) the Hoare annotation is: (and (<= 5 |fibo1_#in~n|) (or (< |fibo1_#in~n| 6) (<= 7 |fibo1_#in~n|) (and (<= 5 |fibo1_#t~ret7|) (<= |fibo1_#t~ret7| 5))) (<= |fibo1_#in~n| fibo1_~n) (<= fibo1_~n |fibo1_#in~n|)) [2021-10-11 02:23:55,790 INFO L262 CegarLoopResult]: For program point L12(lines 12 16) no Hoare annotation was computed. [2021-10-11 02:23:55,791 INFO L262 CegarLoopResult]: For program point L15-3(line 15) no Hoare annotation was computed. [2021-10-11 02:23:55,791 INFO L262 CegarLoopResult]: For program point fibo1FINAL(lines 9 17) no Hoare annotation was computed. [2021-10-11 02:23:55,791 INFO L262 CegarLoopResult]: For program point L10(lines 10 16) no Hoare annotation was computed. [2021-10-11 02:23:55,791 INFO L262 CegarLoopResult]: For program point fibo1EXIT(lines 9 17) no Hoare annotation was computed. [2021-10-11 02:23:55,802 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 11.10 02:23:55 BoogieIcfgContainer [2021-10-11 02:23:55,803 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-10-11 02:23:55,803 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2021-10-11 02:23:55,803 INFO L271 PluginConnector]: Initializing Witness Printer... [2021-10-11 02:23:55,803 INFO L275 PluginConnector]: Witness Printer initialized [2021-10-11 02:23:55,804 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 11.10 02:23:11" (3/4) ... [2021-10-11 02:23:55,806 INFO L137 WitnessPrinter]: Generating witness for correct program [2021-10-11 02:23:55,810 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure fibo2 [2021-10-11 02:23:55,810 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure fibo1 [2021-10-11 02:23:55,814 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 11 nodes and edges [2021-10-11 02:23:55,814 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 4 nodes and edges [2021-10-11 02:23:55,814 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 2 nodes and edges [2021-10-11 02:23:55,814 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 1 nodes and edges [2021-10-11 02:23:55,856 INFO L141 WitnessManager]: Wrote witness to /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7490f43b-da53-4754-a858-e7f75e557a3d/bin/utaipan-WLngWcDbfI/witness.graphml [2021-10-11 02:23:55,857 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2021-10-11 02:23:55,858 INFO L168 Benchmark]: Toolchain (without parser) took 44985.99 ms. Allocated memory was 88.1 MB in the beginning and 685.8 MB in the end (delta: 597.7 MB). Free memory was 49.0 MB in the beginning and 551.0 MB in the end (delta: -502.0 MB). Peak memory consumption was 96.6 MB. Max. memory is 16.1 GB. [2021-10-11 02:23:55,858 INFO L168 Benchmark]: CDTParser took 0.27 ms. Allocated memory is still 88.1 MB. Free memory was 64.9 MB in the beginning and 64.9 MB in the end (delta: 41.6 kB). There was no memory consumed. Max. memory is 16.1 GB. [2021-10-11 02:23:55,859 INFO L168 Benchmark]: CACSL2BoogieTranslator took 232.82 ms. Allocated memory is still 88.1 MB. Free memory was 48.8 MB in the beginning and 64.8 MB in the end (delta: -16.0 MB). Peak memory consumption was 5.9 MB. Max. memory is 16.1 GB. [2021-10-11 02:23:55,859 INFO L168 Benchmark]: Boogie Procedure Inliner took 36.66 ms. Allocated memory is still 88.1 MB. Free memory was 64.8 MB in the beginning and 63.5 MB in the end (delta: 1.3 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2021-10-11 02:23:55,860 INFO L168 Benchmark]: Boogie Preprocessor took 38.24 ms. Allocated memory is still 88.1 MB. Free memory was 63.5 MB in the beginning and 62.5 MB in the end (delta: 966.9 kB). There was no memory consumed. Max. memory is 16.1 GB. [2021-10-11 02:23:55,860 INFO L168 Benchmark]: RCFGBuilder took 437.10 ms. Allocated memory is still 88.1 MB. Free memory was 62.5 MB in the beginning and 48.0 MB in the end (delta: 14.5 MB). Peak memory consumption was 14.7 MB. Max. memory is 16.1 GB. [2021-10-11 02:23:55,861 INFO L168 Benchmark]: TraceAbstraction took 44181.10 ms. Allocated memory was 88.1 MB in the beginning and 685.8 MB in the end (delta: 597.7 MB). Free memory was 47.5 MB in the beginning and 553.1 MB in the end (delta: -505.5 MB). Peak memory consumption was 400.8 MB. Max. memory is 16.1 GB. [2021-10-11 02:23:55,861 INFO L168 Benchmark]: Witness Printer took 53.94 ms. Allocated memory is still 685.8 MB. Free memory was 553.1 MB in the beginning and 551.0 MB in the end (delta: 2.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2021-10-11 02:23:55,863 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.27 ms. Allocated memory is still 88.1 MB. Free memory was 64.9 MB in the beginning and 64.9 MB in the end (delta: 41.6 kB). There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 232.82 ms. Allocated memory is still 88.1 MB. Free memory was 48.8 MB in the beginning and 64.8 MB in the end (delta: -16.0 MB). Peak memory consumption was 5.9 MB. Max. memory is 16.1 GB. * Boogie Procedure Inliner took 36.66 ms. Allocated memory is still 88.1 MB. Free memory was 64.8 MB in the beginning and 63.5 MB in the end (delta: 1.3 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * Boogie Preprocessor took 38.24 ms. Allocated memory is still 88.1 MB. Free memory was 63.5 MB in the beginning and 62.5 MB in the end (delta: 966.9 kB). There was no memory consumed. Max. memory is 16.1 GB. * RCFGBuilder took 437.10 ms. Allocated memory is still 88.1 MB. Free memory was 62.5 MB in the beginning and 48.0 MB in the end (delta: 14.5 MB). Peak memory consumption was 14.7 MB. Max. memory is 16.1 GB. * TraceAbstraction took 44181.10 ms. Allocated memory was 88.1 MB in the beginning and 685.8 MB in the end (delta: 597.7 MB). Free memory was 47.5 MB in the beginning and 553.1 MB in the end (delta: -505.5 MB). Peak memory consumption was 400.8 MB. Max. memory is 16.1 GB. * Witness Printer took 53.94 ms. Allocated memory is still 685.8 MB. Free memory was 553.1 MB in the beginning and 551.0 MB in the end (delta: 2.1 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: 41]: call to reach_error is unreachable For all program executions holds that call to reach_error is unreachable at this location - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - InvariantResult [Line: 40]: Loop Invariant Derived loop invariant: 6 <= x - StatisticsResult: Ultimate Automizer benchmark data CFG has 3 procedures, 26 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 40.6s, OverallIterations: 19, TraceHistogramMax: 18, AutomataDifference: 8.2s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 3.3s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 504 SDtfs, 1086 SDslu, 4257 SDs, 0 SdLazy, 5726 SolverSat, 1025 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 3.9s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 4785 GetRequests, 4259 SyntacticMatches, 75 SemanticMatches, 451 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2153 ImplicationChecksByTransitivity, 6.7s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=150occurred in iteration=12, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.2s AutomataMinimizationTime, 19 MinimizatonAttempts, 201 StatesRemovedByMinimization, 14 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 8 LocationsWithAnnotation, 500 PreInvPairs, 1127 NumberOfFragments, 100 HoareAnnotationTreeSize, 500 FomulaSimplifications, 23921 FormulaSimplificationTreeSizeReduction, 1.2s HoareSimplificationTime, 8 FomulaSimplificationsInter, 15895 FormulaSimplificationTreeSizeReductionInter, 2.0s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.3s SsaConstructionTime, 1.1s SatisfiabilityAnalysisTime, 24.3s InterpolantComputationTime, 4427 NumberOfCodeBlocks, 3981 NumberOfCodeBlocksAsserted, 51 NumberOfCheckSat, 6578 ConstructedInterpolants, 0 QuantifiedInterpolants, 1843768 SizeOfPredicates, 92 NumberOfNonLiveVariables, 4334 ConjunctsInSsa, 277 ConjunctsInUnsatCore, 53 InterpolantComputations, 2 PerfectInterpolantSequences, 23343/28599 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...