./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/loop-simple/nested_4.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 7b2dab56 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud-vcloud-master/worker/run_dir_24d2a489-5264-4870-a197-18d8d4f966a4/bin/utaipan/data/config -Xmx15G -Xms4m -jar /tmp/vcloud-vcloud-master/worker/run_dir_24d2a489-5264-4870-a197-18d8d4f966a4/bin/utaipan/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/run_dir_24d2a489-5264-4870-a197-18d8d4f966a4/bin/utaipan/data -tc /tmp/vcloud-vcloud-master/worker/run_dir_24d2a489-5264-4870-a197-18d8d4f966a4/bin/utaipan/config/TaipanReach.xml -i ../../sv-benchmarks/c/loop-simple/nested_4.c -s /tmp/vcloud-vcloud-master/worker/run_dir_24d2a489-5264-4870-a197-18d8d4f966a4/bin/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/run_dir_24d2a489-5264-4870-a197-18d8d4f966a4/bin/utaipan --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 1f0612232c1c27f632e5ebc1ac9944571433fe3b ....................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... Execution finished normally Writing output log to file Ultimate.log Result: TRUE --- Real Ultimate output --- This is Ultimate 0.2.0-7b2dab5 [2020-12-09 06:03:10,627 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-12-09 06:03:10,638 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-12-09 06:03:10,659 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-12-09 06:03:10,659 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-12-09 06:03:10,660 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-12-09 06:03:10,661 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-12-09 06:03:10,663 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-12-09 06:03:10,665 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-12-09 06:03:10,665 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-12-09 06:03:10,666 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-12-09 06:03:10,667 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-12-09 06:03:10,668 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-12-09 06:03:10,669 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-12-09 06:03:10,670 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-12-09 06:03:10,671 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-12-09 06:03:10,671 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-12-09 06:03:10,672 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-12-09 06:03:10,674 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-12-09 06:03:10,675 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-12-09 06:03:10,677 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-12-09 06:03:10,678 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-12-09 06:03:10,680 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-12-09 06:03:10,681 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-12-09 06:03:10,684 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-12-09 06:03:10,684 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-12-09 06:03:10,685 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-12-09 06:03:10,685 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-12-09 06:03:10,686 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-12-09 06:03:10,687 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-12-09 06:03:10,687 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-12-09 06:03:10,688 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-12-09 06:03:10,689 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-12-09 06:03:10,690 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-12-09 06:03:10,691 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-12-09 06:03:10,692 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-12-09 06:03:10,692 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-12-09 06:03:10,692 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-12-09 06:03:10,693 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-12-09 06:03:10,694 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-12-09 06:03:10,694 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-12-09 06:03:10,695 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud-vcloud-master/worker/run_dir_24d2a489-5264-4870-a197-18d8d4f966a4/bin/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf [2020-12-09 06:03:10,718 INFO L113 SettingsManager]: Loading preferences was successful [2020-12-09 06:03:10,718 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-12-09 06:03:10,719 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2020-12-09 06:03:10,719 INFO L138 SettingsManager]: * User list type=DISABLED [2020-12-09 06:03:10,719 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2020-12-09 06:03:10,719 INFO L138 SettingsManager]: * Explicit value domain=true [2020-12-09 06:03:10,719 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2020-12-09 06:03:10,720 INFO L138 SettingsManager]: * Octagon Domain=false [2020-12-09 06:03:10,720 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2020-12-09 06:03:10,720 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2020-12-09 06:03:10,720 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2020-12-09 06:03:10,720 INFO L138 SettingsManager]: * Interval Domain=false [2020-12-09 06:03:10,720 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2020-12-09 06:03:10,721 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2020-12-09 06:03:10,721 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2020-12-09 06:03:10,721 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-12-09 06:03:10,722 INFO L138 SettingsManager]: * sizeof long=4 [2020-12-09 06:03:10,722 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-12-09 06:03:10,722 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-12-09 06:03:10,722 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-12-09 06:03:10,722 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-12-09 06:03:10,722 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-12-09 06:03:10,723 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-12-09 06:03:10,723 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2020-12-09 06:03:10,723 INFO L138 SettingsManager]: * sizeof long double=12 [2020-12-09 06:03:10,723 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-12-09 06:03:10,723 INFO L138 SettingsManager]: * Use constant arrays=true [2020-12-09 06:03:10,723 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-12-09 06:03:10,724 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-12-09 06:03:10,724 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-12-09 06:03:10,724 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-12-09 06:03:10,724 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-12-09 06:03:10,724 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-12-09 06:03:10,724 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-12-09 06:03:10,725 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2020-12-09 06:03:10,725 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-12-09 06:03:10,725 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-12-09 06:03:10,725 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-12-09 06:03:10,725 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2020-12-09 06:03:10,725 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/tmp/vcloud-vcloud-master/worker/run_dir_24d2a489-5264-4870-a197-18d8d4f966a4/bin/utaipan/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud-vcloud-master/worker/run_dir_24d2a489-5264-4870-a197-18d8d4f966a4/bin/utaipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 1f0612232c1c27f632e5ebc1ac9944571433fe3b [2020-12-09 06:03:10,903 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-12-09 06:03:10,919 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-12-09 06:03:10,921 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-12-09 06:03:10,921 INFO L271 PluginConnector]: Initializing CDTParser... [2020-12-09 06:03:10,922 INFO L275 PluginConnector]: CDTParser initialized [2020-12-09 06:03:10,923 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/run_dir_24d2a489-5264-4870-a197-18d8d4f966a4/bin/utaipan/../../sv-benchmarks/c/loop-simple/nested_4.c [2020-12-09 06:03:10,964 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_24d2a489-5264-4870-a197-18d8d4f966a4/bin/utaipan/data/796c915d9/67bf77e13ef34f7c8a8f314396bdd152/FLAGffc779633 [2020-12-09 06:03:11,329 INFO L306 CDTParser]: Found 1 translation units. [2020-12-09 06:03:11,329 INFO L160 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/run_dir_24d2a489-5264-4870-a197-18d8d4f966a4/sv-benchmarks/c/loop-simple/nested_4.c [2020-12-09 06:03:11,334 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_24d2a489-5264-4870-a197-18d8d4f966a4/bin/utaipan/data/796c915d9/67bf77e13ef34f7c8a8f314396bdd152/FLAGffc779633 [2020-12-09 06:03:11,343 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/run_dir_24d2a489-5264-4870-a197-18d8d4f966a4/bin/utaipan/data/796c915d9/67bf77e13ef34f7c8a8f314396bdd152 [2020-12-09 06:03:11,345 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-12-09 06:03:11,346 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2020-12-09 06:03:11,347 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-12-09 06:03:11,347 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-12-09 06:03:11,350 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-12-09 06:03:11,350 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 09.12 06:03:11" (1/1) ... [2020-12-09 06:03:11,351 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3966f1c6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 06:03:11, skipping insertion in model container [2020-12-09 06:03:11,352 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 09.12 06:03:11" (1/1) ... [2020-12-09 06:03:11,357 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-12-09 06:03:11,366 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-12-09 06:03:11,461 WARN L226 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud-vcloud-master/worker/run_dir_24d2a489-5264-4870-a197-18d8d4f966a4/sv-benchmarks/c/loop-simple/nested_4.c[841,854] [2020-12-09 06:03:11,464 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-09 06:03:11,471 INFO L203 MainTranslator]: Completed pre-run [2020-12-09 06:03:11,482 WARN L226 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud-vcloud-master/worker/run_dir_24d2a489-5264-4870-a197-18d8d4f966a4/sv-benchmarks/c/loop-simple/nested_4.c[841,854] [2020-12-09 06:03:11,483 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-09 06:03:11,492 INFO L208 MainTranslator]: Completed translation [2020-12-09 06:03:11,493 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 06:03:11 WrapperNode [2020-12-09 06:03:11,493 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-12-09 06:03:11,494 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2020-12-09 06:03:11,494 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2020-12-09 06:03:11,494 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2020-12-09 06:03:11,499 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 06:03:11" (1/1) ... [2020-12-09 06:03:11,504 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 06:03:11" (1/1) ... [2020-12-09 06:03:11,516 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2020-12-09 06:03:11,516 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-12-09 06:03:11,517 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-12-09 06:03:11,517 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-12-09 06:03:11,522 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 06:03:11" (1/1) ... [2020-12-09 06:03:11,523 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 06:03:11" (1/1) ... [2020-12-09 06:03:11,524 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 06:03:11" (1/1) ... [2020-12-09 06:03:11,524 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 06:03:11" (1/1) ... [2020-12-09 06:03:11,526 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 06:03:11" (1/1) ... [2020-12-09 06:03:11,529 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 06:03:11" (1/1) ... [2020-12-09 06:03:11,530 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 06:03:11" (1/1) ... [2020-12-09 06:03:11,531 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-12-09 06:03:11,532 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-12-09 06:03:11,532 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-12-09 06:03:11,532 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-12-09 06:03:11,533 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 06:03:11" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_24d2a489-5264-4870-a197-18d8d4f966a4/bin/utaipan/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-12-09 06:03:11,593 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-12-09 06:03:11,594 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-12-09 06:03:11,594 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-12-09 06:03:11,594 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-12-09 06:03:11,771 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-12-09 06:03:11,771 INFO L299 CfgBuilder]: Removed 8 assume(true) statements. [2020-12-09 06:03:11,773 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 09.12 06:03:11 BoogieIcfgContainer [2020-12-09 06:03:11,773 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-12-09 06:03:11,774 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-12-09 06:03:11,775 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-12-09 06:03:11,777 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-12-09 06:03:11,778 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 09.12 06:03:11" (1/3) ... [2020-12-09 06:03:11,778 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2eadafd0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 09.12 06:03:11, skipping insertion in model container [2020-12-09 06:03:11,778 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 06:03:11" (2/3) ... [2020-12-09 06:03:11,779 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2eadafd0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 09.12 06:03:11, skipping insertion in model container [2020-12-09 06:03:11,779 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 09.12 06:03:11" (3/3) ... [2020-12-09 06:03:11,780 INFO L111 eAbstractionObserver]: Analyzing ICFG nested_4.c [2020-12-09 06:03:11,790 INFO L180 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-12-09 06:03:11,792 INFO L192 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-12-09 06:03:11,800 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-12-09 06:03:11,816 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-12-09 06:03:11,816 INFO L378 AbstractCegarLoop]: Hoare is true [2020-12-09 06:03:11,816 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-12-09 06:03:11,817 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-12-09 06:03:11,817 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-12-09 06:03:11,817 INFO L382 AbstractCegarLoop]: Difference is false [2020-12-09 06:03:11,817 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-12-09 06:03:11,817 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-12-09 06:03:11,825 INFO L276 IsEmpty]: Start isEmpty. Operand 10 states. [2020-12-09 06:03:11,829 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2020-12-09 06:03:11,829 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 06:03:11,829 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1] [2020-12-09 06:03:11,830 INFO L429 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-09 06:03:11,833 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 06:03:11,834 INFO L82 PathProgramCache]: Analyzing trace with hash 2901066, now seen corresponding path program 1 times [2020-12-09 06:03:11,840 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 06:03:11,840 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [906635032] [2020-12-09 06:03:11,841 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 06:03:11,906 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 06:03:11,951 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 06:03:11,951 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [906635032] [2020-12-09 06:03:11,952 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-09 06:03:11,952 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-12-09 06:03:11,952 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [875191461] [2020-12-09 06:03:11,955 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-12-09 06:03:11,955 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 06:03:11,964 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-12-09 06:03:11,965 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-12-09 06:03:11,966 INFO L87 Difference]: Start difference. First operand 10 states. Second operand 3 states. [2020-12-09 06:03:11,990 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 06:03:11,990 INFO L93 Difference]: Finished difference Result 19 states and 27 transitions. [2020-12-09 06:03:11,991 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-12-09 06:03:11,992 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 4 [2020-12-09 06:03:11,992 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 06:03:11,999 INFO L225 Difference]: With dead ends: 19 [2020-12-09 06:03:11,999 INFO L226 Difference]: Without dead ends: 12 [2020-12-09 06:03:12,002 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-12-09 06:03:12,017 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2020-12-09 06:03:12,028 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 9. [2020-12-09 06:03:12,029 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 9 states. [2020-12-09 06:03:12,029 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9 states to 9 states and 12 transitions. [2020-12-09 06:03:12,031 INFO L78 Accepts]: Start accepts. Automaton has 9 states and 12 transitions. Word has length 4 [2020-12-09 06:03:12,031 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 06:03:12,031 INFO L481 AbstractCegarLoop]: Abstraction has 9 states and 12 transitions. [2020-12-09 06:03:12,031 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-12-09 06:03:12,031 INFO L276 IsEmpty]: Start isEmpty. Operand 9 states and 12 transitions. [2020-12-09 06:03:12,032 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2020-12-09 06:03:12,032 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 06:03:12,032 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2020-12-09 06:03:12,032 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-12-09 06:03:12,032 INFO L429 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-09 06:03:12,033 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 06:03:12,033 INFO L82 PathProgramCache]: Analyzing trace with hash -1563687286, now seen corresponding path program 1 times [2020-12-09 06:03:12,033 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 06:03:12,034 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1774364864] [2020-12-09 06:03:12,034 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 06:03:12,047 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 06:03:12,065 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 06:03:12,066 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1774364864] [2020-12-09 06:03:12,066 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-09 06:03:12,066 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-12-09 06:03:12,066 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [61655751] [2020-12-09 06:03:12,067 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-12-09 06:03:12,068 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 06:03:12,069 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-12-09 06:03:12,069 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-12-09 06:03:12,069 INFO L87 Difference]: Start difference. First operand 9 states and 12 transitions. Second operand 3 states. [2020-12-09 06:03:12,091 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 06:03:12,092 INFO L93 Difference]: Finished difference Result 19 states and 28 transitions. [2020-12-09 06:03:12,092 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-12-09 06:03:12,092 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 6 [2020-12-09 06:03:12,092 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 06:03:12,093 INFO L225 Difference]: With dead ends: 19 [2020-12-09 06:03:12,093 INFO L226 Difference]: Without dead ends: 12 [2020-12-09 06:03:12,094 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-12-09 06:03:12,094 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2020-12-09 06:03:12,096 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 10. [2020-12-09 06:03:12,096 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 10 states. [2020-12-09 06:03:12,097 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10 states to 10 states and 13 transitions. [2020-12-09 06:03:12,097 INFO L78 Accepts]: Start accepts. Automaton has 10 states and 13 transitions. Word has length 6 [2020-12-09 06:03:12,097 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 06:03:12,097 INFO L481 AbstractCegarLoop]: Abstraction has 10 states and 13 transitions. [2020-12-09 06:03:12,097 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-12-09 06:03:12,097 INFO L276 IsEmpty]: Start isEmpty. Operand 10 states and 13 transitions. [2020-12-09 06:03:12,097 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2020-12-09 06:03:12,098 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 06:03:12,098 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2020-12-09 06:03:12,098 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-12-09 06:03:12,098 INFO L429 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-09 06:03:12,099 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 06:03:12,099 INFO L82 PathProgramCache]: Analyzing trace with hash -1070317379, now seen corresponding path program 1 times [2020-12-09 06:03:12,099 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 06:03:12,099 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [121809232] [2020-12-09 06:03:12,100 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 06:03:12,119 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 06:03:12,140 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 06:03:12,141 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [121809232] [2020-12-09 06:03:12,141 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-09 06:03:12,141 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-12-09 06:03:12,142 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1439399702] [2020-12-09 06:03:12,142 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-12-09 06:03:12,142 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 06:03:12,143 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-12-09 06:03:12,143 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-12-09 06:03:12,144 INFO L87 Difference]: Start difference. First operand 10 states and 13 transitions. Second operand 3 states. [2020-12-09 06:03:12,158 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 06:03:12,158 INFO L93 Difference]: Finished difference Result 20 states and 28 transitions. [2020-12-09 06:03:12,159 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-12-09 06:03:12,159 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 8 [2020-12-09 06:03:12,159 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 06:03:12,159 INFO L225 Difference]: With dead ends: 20 [2020-12-09 06:03:12,160 INFO L226 Difference]: Without dead ends: 12 [2020-12-09 06:03:12,160 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-12-09 06:03:12,161 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2020-12-09 06:03:12,163 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 11. [2020-12-09 06:03:12,163 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 11 states. [2020-12-09 06:03:12,163 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 14 transitions. [2020-12-09 06:03:12,164 INFO L78 Accepts]: Start accepts. Automaton has 11 states and 14 transitions. Word has length 8 [2020-12-09 06:03:12,164 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 06:03:12,164 INFO L481 AbstractCegarLoop]: Abstraction has 11 states and 14 transitions. [2020-12-09 06:03:12,164 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-12-09 06:03:12,164 INFO L276 IsEmpty]: Start isEmpty. Operand 11 states and 14 transitions. [2020-12-09 06:03:12,165 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-12-09 06:03:12,165 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 06:03:12,165 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-09 06:03:12,165 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-12-09 06:03:12,165 INFO L429 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-09 06:03:12,166 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 06:03:12,166 INFO L82 PathProgramCache]: Analyzing trace with hash -1673814224, now seen corresponding path program 1 times [2020-12-09 06:03:12,166 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 06:03:12,167 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1824395107] [2020-12-09 06:03:12,167 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 06:03:12,178 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 06:03:12,198 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 06:03:12,199 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1824395107] [2020-12-09 06:03:12,199 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-09 06:03:12,199 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-12-09 06:03:12,199 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1983102844] [2020-12-09 06:03:12,200 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-12-09 06:03:12,200 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 06:03:12,201 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-12-09 06:03:12,201 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-12-09 06:03:12,201 INFO L87 Difference]: Start difference. First operand 11 states and 14 transitions. Second operand 3 states. [2020-12-09 06:03:12,213 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 06:03:12,213 INFO L93 Difference]: Finished difference Result 21 states and 28 transitions. [2020-12-09 06:03:12,213 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-12-09 06:03:12,213 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 10 [2020-12-09 06:03:12,213 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 06:03:12,214 INFO L225 Difference]: With dead ends: 21 [2020-12-09 06:03:12,214 INFO L226 Difference]: Without dead ends: 12 [2020-12-09 06:03:12,214 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-12-09 06:03:12,214 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2020-12-09 06:03:12,216 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2020-12-09 06:03:12,216 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2020-12-09 06:03:12,216 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 15 transitions. [2020-12-09 06:03:12,216 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 15 transitions. Word has length 10 [2020-12-09 06:03:12,217 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 06:03:12,217 INFO L481 AbstractCegarLoop]: Abstraction has 12 states and 15 transitions. [2020-12-09 06:03:12,217 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-12-09 06:03:12,217 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 15 transitions. [2020-12-09 06:03:12,217 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2020-12-09 06:03:12,217 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 06:03:12,217 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-09 06:03:12,217 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-12-09 06:03:12,217 INFO L429 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-09 06:03:12,218 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 06:03:12,218 INFO L82 PathProgramCache]: Analyzing trace with hash -1325970581, now seen corresponding path program 1 times [2020-12-09 06:03:12,218 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 06:03:12,218 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1785968507] [2020-12-09 06:03:12,218 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 06:03:12,226 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 06:03:12,241 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 3 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 06:03:12,241 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1785968507] [2020-12-09 06:03:12,241 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [530659054] [2020-12-09 06:03:12,241 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_24d2a489-5264-4870-a197-18d8d4f966a4/bin/utaipan/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-09 06:03:12,276 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 06:03:12,277 INFO L263 TraceCheckSpWp]: Trace formula consists of 63 conjuncts, 3 conjunts are in the unsatisfiable core [2020-12-09 06:03:12,282 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-09 06:03:12,319 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 3 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 06:03:12,319 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-09 06:03:12,340 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 3 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 06:03:12,340 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1791665484] [2020-12-09 06:03:12,358 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2020-12-09 06:03:12,358 INFO L166 IcfgInterpreter]: Building call graph [2020-12-09 06:03:12,362 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-12-09 06:03:12,367 INFO L176 IcfgInterpreter]: Starting interpretation [2020-12-09 06:03:12,368 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-12-09 06:03:13,580 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.FixpointLoopSummarizer.summarize(FixpointLoopSummarizer.java:94) at de.uni_freiburg.informatik.ultimate.lib.sifa.DagInterpreter.ipretLoop(DagInterpreter.java:177) at de.uni_freiburg.informatik.ultimate.lib.sifa.DagInterpreter.ipretNode(DagInterpreter.java:168) 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) [2020-12-09 06:03:13,581 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-12-09 06:03:13,581 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 7 [2020-12-09 06:03:13,582 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [137188071] [2020-12-09 06:03:13,582 INFO L461 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-12-09 06:03:13,582 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 06:03:13,582 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-12-09 06:03:13,583 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2020-12-09 06:03:13,583 INFO L87 Difference]: Start difference. First operand 12 states and 15 transitions. Second operand 7 states. [2020-12-09 06:03:13,600 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 06:03:13,600 INFO L93 Difference]: Finished difference Result 25 states and 34 transitions. [2020-12-09 06:03:13,601 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-12-09 06:03:13,601 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 11 [2020-12-09 06:03:13,601 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 06:03:13,601 INFO L225 Difference]: With dead ends: 25 [2020-12-09 06:03:13,602 INFO L226 Difference]: Without dead ends: 15 [2020-12-09 06:03:13,602 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2020-12-09 06:03:13,602 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2020-12-09 06:03:13,604 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2020-12-09 06:03:13,604 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-12-09 06:03:13,605 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 18 transitions. [2020-12-09 06:03:13,605 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 18 transitions. Word has length 11 [2020-12-09 06:03:13,605 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 06:03:13,605 INFO L481 AbstractCegarLoop]: Abstraction has 15 states and 18 transitions. [2020-12-09 06:03:13,605 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-12-09 06:03:13,606 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 18 transitions. [2020-12-09 06:03:13,606 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-12-09 06:03:13,606 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 06:03:13,606 INFO L422 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-09 06:03:13,808 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-09 06:03:13,809 INFO L429 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-09 06:03:13,810 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 06:03:13,811 INFO L82 PathProgramCache]: Analyzing trace with hash -1008577040, now seen corresponding path program 2 times [2020-12-09 06:03:13,812 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 06:03:13,813 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1393506276] [2020-12-09 06:03:13,813 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 06:03:13,850 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 06:03:13,917 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2020-12-09 06:03:13,918 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1393506276] [2020-12-09 06:03:13,919 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [499790832] [2020-12-09 06:03:13,919 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_24d2a489-5264-4870-a197-18d8d4f966a4/bin/utaipan/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-09 06:03:13,967 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2020-12-09 06:03:13,967 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-09 06:03:13,968 INFO L263 TraceCheckSpWp]: Trace formula consists of 48 conjuncts, 3 conjunts are in the unsatisfiable core [2020-12-09 06:03:13,969 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-09 06:03:13,989 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2020-12-09 06:03:13,989 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-09 06:03:14,013 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2020-12-09 06:03:14,014 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2026444618] [2020-12-09 06:03:14,017 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2020-12-09 06:03:14,017 INFO L166 IcfgInterpreter]: Building call graph [2020-12-09 06:03:14,017 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-12-09 06:03:14,017 INFO L176 IcfgInterpreter]: Starting interpretation [2020-12-09 06:03:14,017 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-12-09 06:03:15,013 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.FixpointLoopSummarizer.summarize(FixpointLoopSummarizer.java:94) at de.uni_freiburg.informatik.ultimate.lib.sifa.DagInterpreter.ipretLoop(DagInterpreter.java:177) at de.uni_freiburg.informatik.ultimate.lib.sifa.DagInterpreter.ipretNode(DagInterpreter.java:168) 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) [2020-12-09 06:03:15,014 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-12-09 06:03:15,014 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 3, 3] total 8 [2020-12-09 06:03:15,014 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2078998869] [2020-12-09 06:03:15,014 INFO L461 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-12-09 06:03:15,014 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 06:03:15,015 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-12-09 06:03:15,015 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=36, Unknown=0, NotChecked=0, Total=56 [2020-12-09 06:03:15,015 INFO L87 Difference]: Start difference. First operand 15 states and 18 transitions. Second operand 8 states. [2020-12-09 06:03:15,115 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 06:03:15,115 INFO L93 Difference]: Finished difference Result 102 states and 132 transitions. [2020-12-09 06:03:15,116 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-12-09 06:03:15,116 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 14 [2020-12-09 06:03:15,116 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 06:03:15,117 INFO L225 Difference]: With dead ends: 102 [2020-12-09 06:03:15,117 INFO L226 Difference]: Without dead ends: 89 [2020-12-09 06:03:15,118 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=90, Invalid=150, Unknown=0, NotChecked=0, Total=240 [2020-12-09 06:03:15,118 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2020-12-09 06:03:15,124 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 69. [2020-12-09 06:03:15,124 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 69 states. [2020-12-09 06:03:15,125 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 85 transitions. [2020-12-09 06:03:15,125 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 85 transitions. Word has length 14 [2020-12-09 06:03:15,125 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 06:03:15,125 INFO L481 AbstractCegarLoop]: Abstraction has 69 states and 85 transitions. [2020-12-09 06:03:15,125 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-12-09 06:03:15,125 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 85 transitions. [2020-12-09 06:03:15,127 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2020-12-09 06:03:15,127 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 06:03:15,127 INFO L422 BasicCegarLoop]: trace histogram [32, 8, 8, 4, 4, 4, 4, 1, 1, 1, 1] [2020-12-09 06:03:15,328 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable196,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-09 06:03:15,329 INFO L429 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-09 06:03:15,330 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 06:03:15,330 INFO L82 PathProgramCache]: Analyzing trace with hash 1776757422, now seen corresponding path program 3 times [2020-12-09 06:03:15,330 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 06:03:15,331 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [215827073] [2020-12-09 06:03:15,331 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 06:03:15,372 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 06:03:15,446 INFO L134 CoverageAnalysis]: Checked inductivity of 884 backedges. 343 proven. 1 refuted. 0 times theorem prover too weak. 540 trivial. 0 not checked. [2020-12-09 06:03:15,447 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [215827073] [2020-12-09 06:03:15,447 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1278194837] [2020-12-09 06:03:15,447 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_24d2a489-5264-4870-a197-18d8d4f966a4/bin/utaipan/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-09 06:03:15,488 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-09 06:03:15,488 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-09 06:03:15,488 INFO L263 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 6 conjunts are in the unsatisfiable core [2020-12-09 06:03:15,491 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-09 06:03:15,550 INFO L134 CoverageAnalysis]: Checked inductivity of 884 backedges. 197 proven. 10 refuted. 0 times theorem prover too weak. 677 trivial. 0 not checked. [2020-12-09 06:03:15,550 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-09 06:03:15,606 INFO L134 CoverageAnalysis]: Checked inductivity of 884 backedges. 197 proven. 10 refuted. 0 times theorem prover too weak. 677 trivial. 0 not checked. [2020-12-09 06:03:15,606 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1816637055] [2020-12-09 06:03:15,608 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2020-12-09 06:03:15,608 INFO L166 IcfgInterpreter]: Building call graph [2020-12-09 06:03:15,608 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-12-09 06:03:15,608 INFO L176 IcfgInterpreter]: Starting interpretation [2020-12-09 06:03:15,608 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-12-09 06:03:16,288 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.FixpointLoopSummarizer.summarize(FixpointLoopSummarizer.java:94) at de.uni_freiburg.informatik.ultimate.lib.sifa.DagInterpreter.ipretLoop(DagInterpreter.java:177) at de.uni_freiburg.informatik.ultimate.lib.sifa.DagInterpreter.ipretNode(DagInterpreter.java:168) 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) [2020-12-09 06:03:16,288 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-12-09 06:03:16,288 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 7, 7] total 10 [2020-12-09 06:03:16,289 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1000333996] [2020-12-09 06:03:16,289 INFO L461 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-12-09 06:03:16,289 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 06:03:16,289 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-12-09 06:03:16,290 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2020-12-09 06:03:16,290 INFO L87 Difference]: Start difference. First operand 69 states and 85 transitions. Second operand 10 states. [2020-12-09 06:03:16,419 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 06:03:16,420 INFO L93 Difference]: Finished difference Result 291 states and 399 transitions. [2020-12-09 06:03:16,420 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-12-09 06:03:16,420 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 68 [2020-12-09 06:03:16,420 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 06:03:16,422 INFO L225 Difference]: With dead ends: 291 [2020-12-09 06:03:16,422 INFO L226 Difference]: Without dead ends: 225 [2020-12-09 06:03:16,422 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 150 GetRequests, 129 SyntacticMatches, 1 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 74 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=168, Invalid=294, Unknown=0, NotChecked=0, Total=462 [2020-12-09 06:03:16,423 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 225 states. [2020-12-09 06:03:16,436 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 225 to 157. [2020-12-09 06:03:16,436 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 157 states. [2020-12-09 06:03:16,437 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 157 states to 157 states and 185 transitions. [2020-12-09 06:03:16,437 INFO L78 Accepts]: Start accepts. Automaton has 157 states and 185 transitions. Word has length 68 [2020-12-09 06:03:16,437 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 06:03:16,438 INFO L481 AbstractCegarLoop]: Abstraction has 157 states and 185 transitions. [2020-12-09 06:03:16,438 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-12-09 06:03:16,438 INFO L276 IsEmpty]: Start isEmpty. Operand 157 states and 185 transitions. [2020-12-09 06:03:16,441 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 157 [2020-12-09 06:03:16,441 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 06:03:16,441 INFO L422 BasicCegarLoop]: trace histogram [96, 16, 16, 8, 8, 4, 4, 1, 1, 1, 1] [2020-12-09 06:03:16,642 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable388 [2020-12-09 06:03:16,643 INFO L429 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-09 06:03:16,644 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 06:03:16,644 INFO L82 PathProgramCache]: Analyzing trace with hash 858963474, now seen corresponding path program 4 times [2020-12-09 06:03:16,645 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 06:03:16,645 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2072527576] [2020-12-09 06:03:16,645 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 06:03:16,717 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 06:03:16,777 INFO L134 CoverageAnalysis]: Checked inductivity of 6568 backedges. 1450 proven. 52 refuted. 0 times theorem prover too weak. 5066 trivial. 0 not checked. [2020-12-09 06:03:16,778 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2072527576] [2020-12-09 06:03:16,778 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1303960403] [2020-12-09 06:03:16,778 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_24d2a489-5264-4870-a197-18d8d4f966a4/bin/utaipan/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-09 06:03:16,862 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 06:03:16,863 INFO L263 TraceCheckSpWp]: Trace formula consists of 498 conjuncts, 4 conjunts are in the unsatisfiable core [2020-12-09 06:03:16,867 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-09 06:03:16,957 INFO L134 CoverageAnalysis]: Checked inductivity of 6568 backedges. 1450 proven. 52 refuted. 0 times theorem prover too weak. 5066 trivial. 0 not checked. [2020-12-09 06:03:16,958 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-09 06:03:17,087 INFO L134 CoverageAnalysis]: Checked inductivity of 6568 backedges. 1450 proven. 52 refuted. 0 times theorem prover too weak. 5066 trivial. 0 not checked. [2020-12-09 06:03:17,087 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [815655261] [2020-12-09 06:03:17,089 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2020-12-09 06:03:17,089 INFO L166 IcfgInterpreter]: Building call graph [2020-12-09 06:03:17,089 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-12-09 06:03:17,089 INFO L176 IcfgInterpreter]: Starting interpretation [2020-12-09 06:03:17,089 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-12-09 06:03:17,799 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.FixpointLoopSummarizer.summarize(FixpointLoopSummarizer.java:94) at de.uni_freiburg.informatik.ultimate.lib.sifa.DagInterpreter.ipretLoop(DagInterpreter.java:177) at de.uni_freiburg.informatik.ultimate.lib.sifa.DagInterpreter.ipretNode(DagInterpreter.java:168) 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) [2020-12-09 06:03:17,799 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-12-09 06:03:17,800 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 9 [2020-12-09 06:03:17,800 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [667770081] [2020-12-09 06:03:17,800 INFO L461 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-12-09 06:03:17,801 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 06:03:17,801 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-12-09 06:03:17,801 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2020-12-09 06:03:17,801 INFO L87 Difference]: Start difference. First operand 157 states and 185 transitions. Second operand 9 states. [2020-12-09 06:03:17,842 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 06:03:17,842 INFO L93 Difference]: Finished difference Result 550 states and 667 transitions. [2020-12-09 06:03:17,843 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-12-09 06:03:17,843 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 156 [2020-12-09 06:03:17,843 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 06:03:17,845 INFO L225 Difference]: With dead ends: 550 [2020-12-09 06:03:17,845 INFO L226 Difference]: Without dead ends: 413 [2020-12-09 06:03:17,846 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 315 GetRequests, 308 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2020-12-09 06:03:17,846 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 413 states. [2020-12-09 06:03:17,874 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 413 to 413. [2020-12-09 06:03:17,874 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 413 states. [2020-12-09 06:03:17,876 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 413 states to 413 states and 473 transitions. [2020-12-09 06:03:17,877 INFO L78 Accepts]: Start accepts. Automaton has 413 states and 473 transitions. Word has length 156 [2020-12-09 06:03:17,877 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 06:03:17,877 INFO L481 AbstractCegarLoop]: Abstraction has 413 states and 473 transitions. [2020-12-09 06:03:17,877 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-12-09 06:03:17,877 INFO L276 IsEmpty]: Start isEmpty. Operand 413 states and 473 transitions. [2020-12-09 06:03:17,882 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 413 [2020-12-09 06:03:17,883 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 06:03:17,883 INFO L422 BasicCegarLoop]: trace histogram [288, 48, 48, 8, 8, 4, 4, 1, 1, 1, 1] [2020-12-09 06:03:18,084 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable580,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-09 06:03:18,085 INFO L429 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-09 06:03:18,086 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 06:03:18,086 INFO L82 PathProgramCache]: Analyzing trace with hash -294504334, now seen corresponding path program 5 times [2020-12-09 06:03:18,087 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 06:03:18,087 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1182828856] [2020-12-09 06:03:18,087 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 06:03:18,314 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 06:03:18,486 INFO L134 CoverageAnalysis]: Checked inductivity of 57896 backedges. 21787 proven. 1816 refuted. 0 times theorem prover too weak. 34293 trivial. 0 not checked. [2020-12-09 06:03:18,487 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1182828856] [2020-12-09 06:03:18,487 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1151065437] [2020-12-09 06:03:18,487 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_24d2a489-5264-4870-a197-18d8d4f966a4/bin/utaipan/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-09 06:03:18,798 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 103 check-sat command(s) [2020-12-09 06:03:18,798 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-09 06:03:18,800 INFO L263 TraceCheckSpWp]: Trace formula consists of 654 conjuncts, 4 conjunts are in the unsatisfiable core [2020-12-09 06:03:18,814 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-09 06:03:19,118 INFO L134 CoverageAnalysis]: Checked inductivity of 57896 backedges. 21787 proven. 1816 refuted. 0 times theorem prover too weak. 34293 trivial. 0 not checked. [2020-12-09 06:03:19,118 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-09 06:03:19,382 INFO L134 CoverageAnalysis]: Checked inductivity of 57896 backedges. 21787 proven. 1816 refuted. 0 times theorem prover too weak. 34293 trivial. 0 not checked. [2020-12-09 06:03:19,382 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1473814558] [2020-12-09 06:03:19,384 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2020-12-09 06:03:19,384 INFO L166 IcfgInterpreter]: Building call graph [2020-12-09 06:03:19,384 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-12-09 06:03:19,384 INFO L176 IcfgInterpreter]: Starting interpretation [2020-12-09 06:03:19,385 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-12-09 06:03:20,040 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.FixpointLoopSummarizer.summarize(FixpointLoopSummarizer.java:94) at de.uni_freiburg.informatik.ultimate.lib.sifa.DagInterpreter.ipretLoop(DagInterpreter.java:177) at de.uni_freiburg.informatik.ultimate.lib.sifa.DagInterpreter.ipretNode(DagInterpreter.java:168) 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) [2020-12-09 06:03:20,040 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-12-09 06:03:20,041 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 9 [2020-12-09 06:03:20,041 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [558793419] [2020-12-09 06:03:20,041 INFO L461 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-12-09 06:03:20,042 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 06:03:20,042 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-12-09 06:03:20,042 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2020-12-09 06:03:20,042 INFO L87 Difference]: Start difference. First operand 413 states and 473 transitions. Second operand 9 states. [2020-12-09 06:03:20,132 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 06:03:20,132 INFO L93 Difference]: Finished difference Result 1523 states and 1756 transitions. [2020-12-09 06:03:20,133 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-12-09 06:03:20,133 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 412 [2020-12-09 06:03:20,133 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 06:03:20,138 INFO L225 Difference]: With dead ends: 1523 [2020-12-09 06:03:20,138 INFO L226 Difference]: Without dead ends: 1213 [2020-12-09 06:03:20,140 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 827 GetRequests, 820 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2020-12-09 06:03:20,141 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1213 states. [2020-12-09 06:03:20,214 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1213 to 1213. [2020-12-09 06:03:20,214 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1213 states. [2020-12-09 06:03:20,218 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1213 states to 1213 states and 1385 transitions. [2020-12-09 06:03:20,218 INFO L78 Accepts]: Start accepts. Automaton has 1213 states and 1385 transitions. Word has length 412 [2020-12-09 06:03:20,218 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 06:03:20,218 INFO L481 AbstractCegarLoop]: Abstraction has 1213 states and 1385 transitions. [2020-12-09 06:03:20,218 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-12-09 06:03:20,218 INFO L276 IsEmpty]: Start isEmpty. Operand 1213 states and 1385 transitions. [2020-12-09 06:03:20,260 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1213 [2020-12-09 06:03:20,260 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 06:03:20,260 INFO L422 BasicCegarLoop]: trace histogram [864, 144, 144, 24, 24, 4, 4, 1, 1, 1, 1] [2020-12-09 06:03:20,461 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable772 [2020-12-09 06:03:20,462 INFO L429 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-09 06:03:20,463 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 06:03:20,464 INFO L82 PathProgramCache]: Analyzing trace with hash 649322178, now seen corresponding path program 6 times [2020-12-09 06:03:20,464 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 06:03:20,465 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1740151822] [2020-12-09 06:03:20,465 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 06:03:21,171 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 06:03:22,831 INFO L134 CoverageAnalysis]: Checked inductivity of 521944 backedges. 0 proven. 391912 refuted. 0 times theorem prover too weak. 130032 trivial. 0 not checked. [2020-12-09 06:03:22,832 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1740151822] [2020-12-09 06:03:22,832 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1758678938] [2020-12-09 06:03:22,832 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_24d2a489-5264-4870-a197-18d8d4f966a4/bin/utaipan/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-09 06:03:23,284 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-09 06:03:23,285 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-09 06:03:23,292 INFO L263 TraceCheckSpWp]: Trace formula consists of 3629 conjuncts, 28 conjunts are in the unsatisfiable core [2020-12-09 06:03:23,307 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-09 06:03:25,409 INFO L134 CoverageAnalysis]: Checked inductivity of 521944 backedges. 195955 proven. 27993 refuted. 0 times theorem prover too weak. 297996 trivial. 0 not checked. [2020-12-09 06:03:25,410 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-09 06:03:28,494 INFO L134 CoverageAnalysis]: Checked inductivity of 521944 backedges. 195955 proven. 27993 refuted. 0 times theorem prover too weak. 297996 trivial. 0 not checked. [2020-12-09 06:03:28,495 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1659392311] [2020-12-09 06:03:28,497 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2020-12-09 06:03:28,497 INFO L166 IcfgInterpreter]: Building call graph [2020-12-09 06:03:28,497 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-12-09 06:03:28,497 INFO L176 IcfgInterpreter]: Starting interpretation [2020-12-09 06:03:28,497 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-12-09 06:03:29,150 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.FixpointLoopSummarizer.summarize(FixpointLoopSummarizer.java:94) at de.uni_freiburg.informatik.ultimate.lib.sifa.DagInterpreter.ipretLoop(DagInterpreter.java:177) at de.uni_freiburg.informatik.ultimate.lib.sifa.DagInterpreter.ipretNode(DagInterpreter.java:168) 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) [2020-12-09 06:03:29,151 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-12-09 06:03:29,152 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 25, 25] total 52 [2020-12-09 06:03:29,152 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1289563982] [2020-12-09 06:03:29,153 INFO L461 AbstractCegarLoop]: Interpolant automaton has 52 states [2020-12-09 06:03:29,154 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 06:03:29,154 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2020-12-09 06:03:29,155 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=716, Invalid=1936, Unknown=0, NotChecked=0, Total=2652 [2020-12-09 06:03:29,155 INFO L87 Difference]: Start difference. First operand 1213 states and 1385 transitions. Second operand 52 states. [2020-12-09 06:07:30,041 WARN L197 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 13 [2020-12-09 06:07:45,963 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 06:07:45,963 INFO L93 Difference]: Finished difference Result 1818 states and 2078 transitions. [2020-12-09 06:07:45,965 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 1816 states. [2020-12-09 06:07:45,965 INFO L78 Accepts]: Start accepts. Automaton has 52 states. Word has length 1212 [2020-12-09 06:07:45,969 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 06:07:45,969 INFO L225 Difference]: With dead ends: 1818 [2020-12-09 06:07:45,969 INFO L226 Difference]: Without dead ends: 0 [2020-12-09 06:07:46,102 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 4231 GetRequests, 2377 SyntacticMatches, 1 SemanticMatches, 1853 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1628613 ImplicationChecksByTransitivity, 249.5s TimeCoverageRelationStatistics Valid=340178, Invalid=3098992, Unknown=0, NotChecked=0, Total=3439170 [2020-12-09 06:07:46,102 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-12-09 06:07:46,102 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-12-09 06:07:46,102 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-12-09 06:07:46,102 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-12-09 06:07:46,102 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 1212 [2020-12-09 06:07:46,103 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 06:07:46,103 INFO L481 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-12-09 06:07:46,103 INFO L482 AbstractCegarLoop]: Interpolant automaton has 52 states. [2020-12-09 06:07:46,103 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-12-09 06:07:46,103 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-12-09 06:07:46,304 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable964,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-09 06:07:46,309 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-12-09 06:07:46,670 WARN L197 SmtUtils]: Spent 349.00 ms on a formula simplification. DAG size of input: 327 DAG size of output: 222 [2020-12-09 06:07:57,099 WARN L197 SmtUtils]: Spent 10.42 s on a formula simplification. DAG size of input: 1782 DAG size of output: 1181 [2020-12-09 06:07:58,641 WARN L197 SmtUtils]: Spent 1.52 s on a formula simplification. DAG size of input: 218 DAG size of output: 11 [2020-12-09 06:08:31,107 WARN L197 SmtUtils]: Spent 32.46 s on a formula simplification. DAG size of input: 1149 DAG size of output: 10 [2020-12-09 06:08:31,378 WARN L197 SmtUtils]: Spent 198.00 ms on a formula simplification. DAG size of input: 61 DAG size of output: 12 [2020-12-09 06:08:31,380 INFO L265 CegarLoopResult]: At program point L31-1(lines 31 33) the Hoare annotation is: true [2020-12-09 06:08:31,381 INFO L258 CegarLoopResult]: At program point L23-3(lines 23 29) the Hoare annotation is: (and (< ULTIMATE.start_main_~a~0 6) (<= ULTIMATE.start_main_~c~0 6) (<= 6 ULTIMATE.start_main_~d~0) (<= ULTIMATE.start_main_~d~0 6) (<= ULTIMATE.start_main_~b~0 6) (<= 6 ULTIMATE.start_main_~c~0)) [2020-12-09 06:08:31,381 INFO L262 CegarLoopResult]: For program point L32(line 32) no Hoare annotation was computed. [2020-12-09 06:08:31,381 INFO L262 CegarLoopResult]: For program point ULTIMATE.startENTRY(line -1) no Hoare annotation was computed. [2020-12-09 06:08:31,381 INFO L262 CegarLoopResult]: For program point ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION(line 32) no Hoare annotation was computed. [2020-12-09 06:08:31,381 INFO L258 CegarLoopResult]: At program point L24-3(lines 24 28) the Hoare annotation is: (and (< ULTIMATE.start_main_~a~0 6) (<= ULTIMATE.start_main_~c~0 6) (< ULTIMATE.start_main_~b~0 6) (<= 6 ULTIMATE.start_main_~d~0) (<= ULTIMATE.start_main_~d~0 6)) [2020-12-09 06:08:31,381 INFO L262 CegarLoopResult]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2020-12-09 06:08:31,381 INFO L258 CegarLoopResult]: At program point L25-3(lines 25 27) the Hoare annotation is: (and (< ULTIMATE.start_main_~a~0 6) (< ULTIMATE.start_main_~b~0 6) (<= ULTIMATE.start_main_~d~0 6) (< ULTIMATE.start_main_~c~0 6)) [2020-12-09 06:08:31,381 INFO L258 CegarLoopResult]: At program point L22-3(lines 22 30) the Hoare annotation is: (and (<= ULTIMATE.start_main_~c~0 6) (<= 6 ULTIMATE.start_main_~d~0) (<= ULTIMATE.start_main_~d~0 6) (<= ULTIMATE.start_main_~b~0 6) (<= 6 ULTIMATE.start_main_~b~0) (<= 6 ULTIMATE.start_main_~c~0) (< ULTIMATE.start_main_~a~0 7)) [2020-12-09 06:08:31,381 INFO L262 CegarLoopResult]: For program point L22-4(lines 15 35) no Hoare annotation was computed. [2020-12-09 06:08:31,393 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 09.12 06:08:31 BoogieIcfgContainer [2020-12-09 06:08:31,393 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-12-09 06:08:31,393 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2020-12-09 06:08:31,393 INFO L271 PluginConnector]: Initializing Witness Printer... [2020-12-09 06:08:31,394 INFO L275 PluginConnector]: Witness Printer initialized [2020-12-09 06:08:31,394 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 09.12 06:03:11" (3/4) ... [2020-12-09 06:08:31,396 INFO L137 WitnessPrinter]: Generating witness for correct program [2020-12-09 06:08:31,402 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 12 nodes and edges [2020-12-09 06:08:31,402 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 8 nodes and edges [2020-12-09 06:08:31,402 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 2 nodes and edges [2020-12-09 06:08:31,402 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 1 nodes and edges [2020-12-09 06:08:31,423 INFO L141 WitnessManager]: Wrote witness to /tmp/vcloud-vcloud-master/worker/run_dir_24d2a489-5264-4870-a197-18d8d4f966a4/bin/utaipan/witness.graphml [2020-12-09 06:08:31,423 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2020-12-09 06:08:31,423 INFO L168 Benchmark]: Toolchain (without parser) took 320077.23 ms. Allocated memory was 94.4 MB in the beginning and 1.2 GB in the end (delta: 1.1 GB). Free memory was 68.7 MB in the beginning and 162.8 MB in the end (delta: -94.1 MB). Peak memory consumption was 1.1 GB. Max. memory is 16.1 GB. [2020-12-09 06:08:31,424 INFO L168 Benchmark]: CDTParser took 0.11 ms. Allocated memory is still 67.1 MB. Free memory is still 41.3 MB. There was no memory consumed. Max. memory is 16.1 GB. [2020-12-09 06:08:31,424 INFO L168 Benchmark]: CACSL2BoogieTranslator took 145.87 ms. Allocated memory is still 94.4 MB. Free memory was 68.5 MB in the beginning and 59.3 MB in the end (delta: 9.2 MB). Peak memory consumption was 10.5 MB. Max. memory is 16.1 GB. [2020-12-09 06:08:31,424 INFO L168 Benchmark]: Boogie Procedure Inliner took 22.43 ms. Allocated memory is still 94.4 MB. Free memory was 59.3 MB in the beginning and 57.8 MB in the end (delta: 1.5 MB). There was no memory consumed. Max. memory is 16.1 GB. [2020-12-09 06:08:31,424 INFO L168 Benchmark]: Boogie Preprocessor took 14.45 ms. Allocated memory is still 94.4 MB. Free memory was 57.8 MB in the beginning and 56.7 MB in the end (delta: 1.0 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2020-12-09 06:08:31,425 INFO L168 Benchmark]: RCFGBuilder took 241.55 ms. Allocated memory is still 94.4 MB. Free memory was 56.7 MB in the beginning and 59.4 MB in the end (delta: -2.7 MB). Peak memory consumption was 6.3 MB. Max. memory is 16.1 GB. [2020-12-09 06:08:31,425 INFO L168 Benchmark]: TraceAbstraction took 319618.62 ms. Allocated memory was 94.4 MB in the beginning and 1.2 GB in the end (delta: 1.1 GB). Free memory was 59.0 MB in the beginning and 166.0 MB in the end (delta: -107.0 MB). Peak memory consumption was 1.1 GB. Max. memory is 16.1 GB. [2020-12-09 06:08:31,425 INFO L168 Benchmark]: Witness Printer took 29.44 ms. Allocated memory is still 1.2 GB. Free memory was 166.0 MB in the beginning and 162.8 MB in the end (delta: 3.1 MB). Peak memory consumption was 4.2 MB. Max. memory is 16.1 GB. [2020-12-09 06:08:31,427 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.11 ms. Allocated memory is still 67.1 MB. Free memory is still 41.3 MB. There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 145.87 ms. Allocated memory is still 94.4 MB. Free memory was 68.5 MB in the beginning and 59.3 MB in the end (delta: 9.2 MB). Peak memory consumption was 10.5 MB. Max. memory is 16.1 GB. * Boogie Procedure Inliner took 22.43 ms. Allocated memory is still 94.4 MB. Free memory was 59.3 MB in the beginning and 57.8 MB in the end (delta: 1.5 MB). There was no memory consumed. Max. memory is 16.1 GB. * Boogie Preprocessor took 14.45 ms. Allocated memory is still 94.4 MB. Free memory was 57.8 MB in the beginning and 56.7 MB in the end (delta: 1.0 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * RCFGBuilder took 241.55 ms. Allocated memory is still 94.4 MB. Free memory was 56.7 MB in the beginning and 59.4 MB in the end (delta: -2.7 MB). Peak memory consumption was 6.3 MB. Max. memory is 16.1 GB. * TraceAbstraction took 319618.62 ms. Allocated memory was 94.4 MB in the beginning and 1.2 GB in the end (delta: 1.1 GB). Free memory was 59.0 MB in the beginning and 166.0 MB in the end (delta: -107.0 MB). Peak memory consumption was 1.1 GB. Max. memory is 16.1 GB. * Witness Printer took 29.44 ms. Allocated memory is still 1.2 GB. Free memory was 166.0 MB in the beginning and 162.8 MB in the end (delta: 3.1 MB). Peak memory consumption was 4.2 MB. Max. memory is 16.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 32]: 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: 24]: Loop Invariant Derived loop invariant: (((a < 6 && c <= 6) && b < 6) && 6 <= d) && d <= 6 - InvariantResult [Line: 25]: Loop Invariant Derived loop invariant: ((a < 6 && b < 6) && d <= 6) && c < 6 - InvariantResult [Line: 22]: Loop Invariant Derived loop invariant: (((((c <= 6 && 6 <= d) && d <= 6) && b <= 6) && 6 <= b) && 6 <= c) && a < 7 - InvariantResult [Line: 31]: Loop Invariant Derived loop invariant: 1 - InvariantResult [Line: 23]: Loop Invariant Derived loop invariant: ((((a < 6 && c <= 6) && 6 <= d) && d <= 6) && b <= 6) && 6 <= c - StatisticsResult: Ultimate Automizer benchmark data CFG has 1 procedures, 10 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 274.4s, OverallIterations: 10, TraceHistogramMax: 864, AutomataDifference: 257.3s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 45.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 83 SDtfs, 131 SDslu, 105 SDs, 0 SdLazy, 331 SolverSat, 8466 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 4.8s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 5600 GetRequests, 3688 SyntacticMatches, 2 SemanticMatches, 1910 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1628739 ImplicationChecksByTransitivity, 249.8s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=1213occurred in iteration=9, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.1s AutomataMinimizationTime, 10 MinimizatonAttempts, 94 StatesRemovedByMinimization, 5 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 5 LocationsWithAnnotation, 5 PreInvPairs, 1819 NumberOfFragments, 71 HoareAnnotationTreeSize, 5 FomulaSimplifications, 57997 FormulaSimplificationTreeSizeReduction, 10.8s HoareSimplificationTime, 5 FomulaSimplificationsInter, 28236 FormulaSimplificationTreeSizeReductionInter, 34.2s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.3s SsaConstructionTime, 1.6s SatisfiabilityAnalysisTime, 7.0s InterpolantComputationTime, 3774 NumberOfCodeBlocks, 3560 NumberOfCodeBlocksAsserted, 119 NumberOfCheckSat, 5625 ConstructedInterpolants, 0 QuantifiedInterpolants, 17005054 SizeOfPredicates, 4 NumberOfNonLiveVariables, 5089 ConjunctsInSsa, 48 ConjunctsInUnsatCore, 22 InterpolantComputations, 4 PerfectInterpolantSequences, 1308404/1761933 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...