./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/loop-acceleration/nested_1-1.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 7b2dab56 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud-vcloud-master/worker/run_dir_8923e42c-1e2a-4b87-a77a-1c566f37eafc/bin/utaipan/data/config -Xmx15G -Xms4m -jar /tmp/vcloud-vcloud-master/worker/run_dir_8923e42c-1e2a-4b87-a77a-1c566f37eafc/bin/utaipan/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/run_dir_8923e42c-1e2a-4b87-a77a-1c566f37eafc/bin/utaipan/data -tc /tmp/vcloud-vcloud-master/worker/run_dir_8923e42c-1e2a-4b87-a77a-1c566f37eafc/bin/utaipan/config/TaipanReach.xml -i ../../sv-benchmarks/c/loop-acceleration/nested_1-1.c -s /tmp/vcloud-vcloud-master/worker/run_dir_8923e42c-1e2a-4b87-a77a-1c566f37eafc/bin/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/run_dir_8923e42c-1e2a-4b87-a77a-1c566f37eafc/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 3307686edde000bd6f2709f8ce62af668302d3bc ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... Execution finished normally Writing output log to file Ultimate.log Result: TRUE --- Real Ultimate output --- This is Ultimate 0.2.0-7b2dab5 [2020-12-03 12:30:18,303 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-12-03 12:30:18,305 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-12-03 12:30:18,366 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-12-03 12:30:18,367 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-12-03 12:30:18,371 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-12-03 12:30:18,374 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-12-03 12:30:18,381 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-12-03 12:30:18,384 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-12-03 12:30:18,390 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-12-03 12:30:18,391 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-12-03 12:30:18,393 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-12-03 12:30:18,394 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-12-03 12:30:18,397 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-12-03 12:30:18,399 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-12-03 12:30:18,401 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-12-03 12:30:18,402 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-12-03 12:30:18,406 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-12-03 12:30:18,409 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-12-03 12:30:18,417 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-12-03 12:30:18,419 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-12-03 12:30:18,421 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-12-03 12:30:18,423 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-12-03 12:30:18,424 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-12-03 12:30:18,433 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-12-03 12:30:18,433 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-12-03 12:30:18,434 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-12-03 12:30:18,436 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-12-03 12:30:18,437 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-12-03 12:30:18,438 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-12-03 12:30:18,438 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-12-03 12:30:18,440 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-12-03 12:30:18,442 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-12-03 12:30:18,443 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-12-03 12:30:18,445 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-12-03 12:30:18,445 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-12-03 12:30:18,446 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-12-03 12:30:18,446 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-12-03 12:30:18,446 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-12-03 12:30:18,447 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-12-03 12:30:18,449 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-12-03 12:30:18,452 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud-vcloud-master/worker/run_dir_8923e42c-1e2a-4b87-a77a-1c566f37eafc/bin/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf [2020-12-03 12:30:18,495 INFO L113 SettingsManager]: Loading preferences was successful [2020-12-03 12:30:18,495 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-12-03 12:30:18,497 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2020-12-03 12:30:18,497 INFO L138 SettingsManager]: * User list type=DISABLED [2020-12-03 12:30:18,497 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2020-12-03 12:30:18,497 INFO L138 SettingsManager]: * Explicit value domain=true [2020-12-03 12:30:18,498 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2020-12-03 12:30:18,498 INFO L138 SettingsManager]: * Octagon Domain=false [2020-12-03 12:30:18,498 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2020-12-03 12:30:18,498 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2020-12-03 12:30:18,499 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2020-12-03 12:30:18,500 INFO L138 SettingsManager]: * Interval Domain=false [2020-12-03 12:30:18,500 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2020-12-03 12:30:18,500 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2020-12-03 12:30:18,500 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2020-12-03 12:30:18,501 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-12-03 12:30:18,502 INFO L138 SettingsManager]: * sizeof long=4 [2020-12-03 12:30:18,502 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-12-03 12:30:18,502 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-12-03 12:30:18,502 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-12-03 12:30:18,502 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-12-03 12:30:18,503 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-12-03 12:30:18,503 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-12-03 12:30:18,503 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2020-12-03 12:30:18,503 INFO L138 SettingsManager]: * sizeof long double=12 [2020-12-03 12:30:18,504 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-12-03 12:30:18,504 INFO L138 SettingsManager]: * Use constant arrays=true [2020-12-03 12:30:18,504 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-12-03 12:30:18,504 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-12-03 12:30:18,506 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-12-03 12:30:18,506 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-12-03 12:30:18,506 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-12-03 12:30:18,507 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-12-03 12:30:18,507 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-12-03 12:30:18,507 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2020-12-03 12:30:18,508 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-12-03 12:30:18,508 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-12-03 12:30:18,508 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-12-03 12:30:18,508 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2020-12-03 12:30:18,508 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_8923e42c-1e2a-4b87-a77a-1c566f37eafc/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud-vcloud-master/worker/run_dir_8923e42c-1e2a-4b87-a77a-1c566f37eafc/bin/utaipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 3307686edde000bd6f2709f8ce62af668302d3bc [2020-12-03 12:30:18,758 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-12-03 12:30:18,784 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-12-03 12:30:18,787 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-12-03 12:30:18,788 INFO L271 PluginConnector]: Initializing CDTParser... [2020-12-03 12:30:18,789 INFO L275 PluginConnector]: CDTParser initialized [2020-12-03 12:30:18,790 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/run_dir_8923e42c-1e2a-4b87-a77a-1c566f37eafc/bin/utaipan/../../sv-benchmarks/c/loop-acceleration/nested_1-1.c [2020-12-03 12:30:18,854 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_8923e42c-1e2a-4b87-a77a-1c566f37eafc/bin/utaipan/data/e44b69cd8/33445c4ec31747f1baf2ff205b4ec4e1/FLAG8e966cbf1 [2020-12-03 12:30:19,329 INFO L306 CDTParser]: Found 1 translation units. [2020-12-03 12:30:19,330 INFO L160 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/run_dir_8923e42c-1e2a-4b87-a77a-1c566f37eafc/sv-benchmarks/c/loop-acceleration/nested_1-1.c [2020-12-03 12:30:19,340 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_8923e42c-1e2a-4b87-a77a-1c566f37eafc/bin/utaipan/data/e44b69cd8/33445c4ec31747f1baf2ff205b4ec4e1/FLAG8e966cbf1 [2020-12-03 12:30:19,717 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/run_dir_8923e42c-1e2a-4b87-a77a-1c566f37eafc/bin/utaipan/data/e44b69cd8/33445c4ec31747f1baf2ff205b4ec4e1 [2020-12-03 12:30:19,719 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-12-03 12:30:19,721 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2020-12-03 12:30:19,724 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-12-03 12:30:19,724 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-12-03 12:30:19,729 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-12-03 12:30:19,730 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 03.12 12:30:19" (1/1) ... [2020-12-03 12:30:19,732 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@8f701b0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.12 12:30:19, skipping insertion in model container [2020-12-03 12:30:19,733 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 03.12 12:30:19" (1/1) ... [2020-12-03 12:30:19,740 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-12-03 12:30:19,756 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-12-03 12:30:19,933 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_8923e42c-1e2a-4b87-a77a-1c566f37eafc/sv-benchmarks/c/loop-acceleration/nested_1-1.c[322,335] [2020-12-03 12:30:19,943 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-03 12:30:19,952 INFO L203 MainTranslator]: Completed pre-run [2020-12-03 12:30:19,964 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_8923e42c-1e2a-4b87-a77a-1c566f37eafc/sv-benchmarks/c/loop-acceleration/nested_1-1.c[322,335] [2020-12-03 12:30:19,967 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-03 12:30:19,981 INFO L208 MainTranslator]: Completed translation [2020-12-03 12:30:19,982 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.12 12:30:19 WrapperNode [2020-12-03 12:30:19,982 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-12-03 12:30:19,983 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2020-12-03 12:30:19,984 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2020-12-03 12:30:19,984 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2020-12-03 12:30:19,992 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.12 12:30:19" (1/1) ... [2020-12-03 12:30:19,999 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.12 12:30:19" (1/1) ... [2020-12-03 12:30:20,016 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2020-12-03 12:30:20,017 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-12-03 12:30:20,017 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-12-03 12:30:20,018 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-12-03 12:30:20,026 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.12 12:30:19" (1/1) ... [2020-12-03 12:30:20,026 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.12 12:30:19" (1/1) ... [2020-12-03 12:30:20,027 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.12 12:30:19" (1/1) ... [2020-12-03 12:30:20,028 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.12 12:30:19" (1/1) ... [2020-12-03 12:30:20,031 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.12 12:30:19" (1/1) ... [2020-12-03 12:30:20,035 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.12 12:30:19" (1/1) ... [2020-12-03 12:30:20,036 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.12 12:30:19" (1/1) ... [2020-12-03 12:30:20,040 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-12-03 12:30:20,041 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-12-03 12:30:20,042 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-12-03 12:30:20,042 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-12-03 12:30:20,043 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.12 12:30:19" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_8923e42c-1e2a-4b87-a77a-1c566f37eafc/bin/utaipan/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-12-03 12:30:20,153 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-12-03 12:30:20,154 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-12-03 12:30:20,154 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-12-03 12:30:20,155 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-12-03 12:30:20,434 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-12-03 12:30:20,434 INFO L299 CfgBuilder]: Removed 8 assume(true) statements. [2020-12-03 12:30:20,437 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.12 12:30:20 BoogieIcfgContainer [2020-12-03 12:30:20,437 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-12-03 12:30:20,439 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-12-03 12:30:20,439 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-12-03 12:30:20,442 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-12-03 12:30:20,442 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 03.12 12:30:19" (1/3) ... [2020-12-03 12:30:20,443 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@c47a28e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 03.12 12:30:20, skipping insertion in model container [2020-12-03 12:30:20,444 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.12 12:30:19" (2/3) ... [2020-12-03 12:30:20,444 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@c47a28e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 03.12 12:30:20, skipping insertion in model container [2020-12-03 12:30:20,444 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.12 12:30:20" (3/3) ... [2020-12-03 12:30:20,446 INFO L111 eAbstractionObserver]: Analyzing ICFG nested_1-1.c [2020-12-03 12:30:20,459 INFO L180 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-12-03 12:30:20,462 INFO L192 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-12-03 12:30:20,470 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-12-03 12:30:20,493 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-12-03 12:30:20,493 INFO L378 AbstractCegarLoop]: Hoare is true [2020-12-03 12:30:20,494 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-12-03 12:30:20,494 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-12-03 12:30:20,494 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-12-03 12:30:20,494 INFO L382 AbstractCegarLoop]: Difference is false [2020-12-03 12:30:20,494 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-12-03 12:30:20,495 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-12-03 12:30:20,507 INFO L276 IsEmpty]: Start isEmpty. Operand 8 states. [2020-12-03 12:30:20,511 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2020-12-03 12:30:20,512 INFO L414 BasicCegarLoop]: Found error trace [2020-12-03 12:30:20,512 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1] [2020-12-03 12:30:20,513 INFO L429 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-03 12:30:20,518 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-03 12:30:20,519 INFO L82 PathProgramCache]: Analyzing trace with hash 2220904, now seen corresponding path program 1 times [2020-12-03 12:30:20,528 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-03 12:30:20,529 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1024035185] [2020-12-03 12:30:20,529 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-03 12:30:20,624 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-03 12:30:20,745 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-03 12:30:20,745 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1024035185] [2020-12-03 12:30:20,746 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-03 12:30:20,747 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-12-03 12:30:20,747 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1347382375] [2020-12-03 12:30:20,751 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-12-03 12:30:20,752 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-03 12:30:20,776 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-12-03 12:30:20,777 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-12-03 12:30:20,779 INFO L87 Difference]: Start difference. First operand 8 states. Second operand 3 states. [2020-12-03 12:30:20,805 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-03 12:30:20,805 INFO L93 Difference]: Finished difference Result 15 states and 19 transitions. [2020-12-03 12:30:20,806 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-12-03 12:30:20,807 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 4 [2020-12-03 12:30:20,807 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-03 12:30:20,815 INFO L225 Difference]: With dead ends: 15 [2020-12-03 12:30:20,815 INFO L226 Difference]: Without dead ends: 8 [2020-12-03 12:30:20,818 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-12-03 12:30:20,834 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8 states. [2020-12-03 12:30:20,861 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8 to 7. [2020-12-03 12:30:20,862 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7 states. [2020-12-03 12:30:20,863 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7 states to 7 states and 8 transitions. [2020-12-03 12:30:20,864 INFO L78 Accepts]: Start accepts. Automaton has 7 states and 8 transitions. Word has length 4 [2020-12-03 12:30:20,865 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-03 12:30:20,865 INFO L481 AbstractCegarLoop]: Abstraction has 7 states and 8 transitions. [2020-12-03 12:30:20,865 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-12-03 12:30:20,865 INFO L276 IsEmpty]: Start isEmpty. Operand 7 states and 8 transitions. [2020-12-03 12:30:20,865 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2020-12-03 12:30:20,866 INFO L414 BasicCegarLoop]: Found error trace [2020-12-03 12:30:20,866 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2020-12-03 12:30:20,866 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-12-03 12:30:20,866 INFO L429 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-03 12:30:20,867 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-03 12:30:20,867 INFO L82 PathProgramCache]: Analyzing trace with hash 2101473510, now seen corresponding path program 1 times [2020-12-03 12:30:20,868 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-03 12:30:20,868 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [492773797] [2020-12-03 12:30:20,868 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-03 12:30:20,905 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-03 12:30:20,950 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-03 12:30:20,951 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [492773797] [2020-12-03 12:30:20,951 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-03 12:30:20,951 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-12-03 12:30:20,952 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1645486354] [2020-12-03 12:30:20,953 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-12-03 12:30:20,953 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-03 12:30:20,954 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-12-03 12:30:20,955 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-12-03 12:30:20,955 INFO L87 Difference]: Start difference. First operand 7 states and 8 transitions. Second operand 3 states. [2020-12-03 12:30:20,969 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-03 12:30:20,969 INFO L93 Difference]: Finished difference Result 13 states and 16 transitions. [2020-12-03 12:30:20,970 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-12-03 12:30:20,970 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 6 [2020-12-03 12:30:20,970 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-03 12:30:20,970 INFO L225 Difference]: With dead ends: 13 [2020-12-03 12:30:20,970 INFO L226 Difference]: Without dead ends: 8 [2020-12-03 12:30:20,971 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 [2020-12-03 12:30:20,972 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8 states. [2020-12-03 12:30:20,973 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8 to 8. [2020-12-03 12:30:20,974 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 8 states. [2020-12-03 12:30:20,974 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8 states to 8 states and 9 transitions. [2020-12-03 12:30:20,974 INFO L78 Accepts]: Start accepts. Automaton has 8 states and 9 transitions. Word has length 6 [2020-12-03 12:30:20,975 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-03 12:30:20,975 INFO L481 AbstractCegarLoop]: Abstraction has 8 states and 9 transitions. [2020-12-03 12:30:20,975 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-12-03 12:30:20,975 INFO L276 IsEmpty]: Start isEmpty. Operand 8 states and 9 transitions. [2020-12-03 12:30:20,975 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2020-12-03 12:30:20,975 INFO L414 BasicCegarLoop]: Found error trace [2020-12-03 12:30:20,976 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2020-12-03 12:30:20,976 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-12-03 12:30:20,976 INFO L429 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-03 12:30:20,977 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-03 12:30:20,977 INFO L82 PathProgramCache]: Analyzing trace with hash 698037110, now seen corresponding path program 1 times [2020-12-03 12:30:20,977 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-03 12:30:20,978 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1222732882] [2020-12-03 12:30:20,978 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-03 12:30:21,013 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-03 12:30:21,107 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-03 12:30:21,108 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1222732882] [2020-12-03 12:30:21,108 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1303557905] [2020-12-03 12:30:21,109 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_8923e42c-1e2a-4b87-a77a-1c566f37eafc/bin/utaipan/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-03 12:30:21,175 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-03 12:30:21,177 INFO L263 TraceCheckSpWp]: Trace formula consists of 52 conjuncts, 9 conjunts are in the unsatisfiable core [2020-12-03 12:30:21,181 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-03 12:30:21,229 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-03 12:30:21,230 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-03 12:30:21,260 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-12-03 12:30:21,261 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1590607827] [2020-12-03 12:30:21,293 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2020-12-03 12:30:21,294 INFO L166 IcfgInterpreter]: Building call graph [2020-12-03 12:30:21,299 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-12-03 12:30:21,304 INFO L176 IcfgInterpreter]: Starting interpretation [2020-12-03 12:30:21,305 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-12-03 12:30:21,715 WARN L197 SmtUtils]: Spent 126.00 ms on a formula simplification that was a NOOP. DAG size: 72 [2020-12-03 12:30:22,396 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) [2020-12-03 12:30:22,408 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-12-03 12:30:22,408 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 3] total 9 [2020-12-03 12:30:22,408 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [103554645] [2020-12-03 12:30:22,409 INFO L461 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-12-03 12:30:22,409 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-03 12:30:22,410 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-12-03 12:30:22,410 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=47, Unknown=0, NotChecked=0, Total=72 [2020-12-03 12:30:22,411 INFO L87 Difference]: Start difference. First operand 8 states and 9 transitions. Second operand 9 states. [2020-12-03 12:30:22,607 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-03 12:30:22,607 INFO L93 Difference]: Finished difference Result 27 states and 39 transitions. [2020-12-03 12:30:22,608 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-12-03 12:30:22,608 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 7 [2020-12-03 12:30:22,608 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-03 12:30:22,610 INFO L225 Difference]: With dead ends: 27 [2020-12-03 12:30:22,610 INFO L226 Difference]: Without dead ends: 21 [2020-12-03 12:30:22,613 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 49 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=95, Invalid=177, Unknown=0, NotChecked=0, Total=272 [2020-12-03 12:30:22,613 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-12-03 12:30:22,618 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-12-03 12:30:22,618 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-12-03 12:30:22,619 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2020-12-03 12:30:22,619 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 7 [2020-12-03 12:30:22,619 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-03 12:30:22,619 INFO L481 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2020-12-03 12:30:22,619 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-12-03 12:30:22,619 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2020-12-03 12:30:22,620 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-12-03 12:30:22,620 INFO L414 BasicCegarLoop]: Found error trace [2020-12-03 12:30:22,620 INFO L422 BasicCegarLoop]: trace histogram [8, 4, 4, 1, 1, 1, 1] [2020-12-03 12:30:22,838 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2020-12-03 12:30:22,838 INFO L429 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-03 12:30:22,839 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-03 12:30:22,839 INFO L82 PathProgramCache]: Analyzing trace with hash 1840367456, now seen corresponding path program 2 times [2020-12-03 12:30:22,839 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-03 12:30:22,839 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1631159422] [2020-12-03 12:30:22,839 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-03 12:30:22,876 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-03 12:30:22,956 INFO L134 CoverageAnalysis]: Checked inductivity of 76 backedges. 31 proven. 3 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2020-12-03 12:30:22,957 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1631159422] [2020-12-03 12:30:22,957 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1899501241] [2020-12-03 12:30:22,958 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_8923e42c-1e2a-4b87-a77a-1c566f37eafc/bin/utaipan/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-03 12:30:23,043 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2020-12-03 12:30:23,043 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-03 12:30:23,045 INFO L263 TraceCheckSpWp]: Trace formula consists of 67 conjuncts, 7 conjunts are in the unsatisfiable core [2020-12-03 12:30:23,047 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-03 12:30:23,098 INFO L134 CoverageAnalysis]: Checked inductivity of 76 backedges. 31 proven. 3 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2020-12-03 12:30:23,098 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-03 12:30:23,150 INFO L134 CoverageAnalysis]: Checked inductivity of 76 backedges. 31 proven. 3 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2020-12-03 12:30:23,151 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [643474848] [2020-12-03 12:30:23,154 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2020-12-03 12:30:23,154 INFO L166 IcfgInterpreter]: Building call graph [2020-12-03 12:30:23,155 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-12-03 12:30:23,155 INFO L176 IcfgInterpreter]: Starting interpretation [2020-12-03 12:30:23,155 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-12-03 12:30:23,583 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) [2020-12-03 12:30:23,584 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-12-03 12:30:23,584 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 9 [2020-12-03 12:30:23,584 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1547366940] [2020-12-03 12:30:23,585 INFO L461 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-12-03 12:30:23,586 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-03 12:30:23,587 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-12-03 12:30:23,587 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2020-12-03 12:30:23,587 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand 9 states. [2020-12-03 12:30:23,678 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-03 12:30:23,679 INFO L93 Difference]: Finished difference Result 53 states and 76 transitions. [2020-12-03 12:30:23,680 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-12-03 12:30:23,680 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 20 [2020-12-03 12:30:23,680 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-03 12:30:23,682 INFO L225 Difference]: With dead ends: 53 [2020-12-03 12:30:23,683 INFO L226 Difference]: Without dead ends: 37 [2020-12-03 12:30:23,684 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 35 SyntacticMatches, 1 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=48, Invalid=62, Unknown=0, NotChecked=0, Total=110 [2020-12-03 12:30:23,684 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-12-03 12:30:23,694 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2020-12-03 12:30:23,695 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-12-03 12:30:23,696 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 41 transitions. [2020-12-03 12:30:23,696 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 41 transitions. Word has length 20 [2020-12-03 12:30:23,697 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-03 12:30:23,697 INFO L481 AbstractCegarLoop]: Abstraction has 37 states and 41 transitions. [2020-12-03 12:30:23,697 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-12-03 12:30:23,697 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 41 transitions. [2020-12-03 12:30:23,699 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-12-03 12:30:23,699 INFO L414 BasicCegarLoop]: Found error trace [2020-12-03 12:30:23,699 INFO L422 BasicCegarLoop]: trace histogram [24, 4, 4, 1, 1, 1, 1] [2020-12-03 12:30:23,903 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-03 12:30:23,904 INFO L429 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-03 12:30:23,904 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-03 12:30:23,905 INFO L82 PathProgramCache]: Analyzing trace with hash -380781216, now seen corresponding path program 3 times [2020-12-03 12:30:23,905 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-03 12:30:23,905 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [146870414] [2020-12-03 12:30:23,906 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-03 12:30:23,988 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-03 12:30:24,114 INFO L134 CoverageAnalysis]: Checked inductivity of 388 backedges. 151 proven. 21 refuted. 0 times theorem prover too weak. 216 trivial. 0 not checked. [2020-12-03 12:30:24,115 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [146870414] [2020-12-03 12:30:24,115 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [166710945] [2020-12-03 12:30:24,115 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_8923e42c-1e2a-4b87-a77a-1c566f37eafc/bin/utaipan/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-03 12:30:24,174 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-03 12:30:24,174 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-03 12:30:24,175 INFO L263 TraceCheckSpWp]: Trace formula consists of 139 conjuncts, 15 conjunts are in the unsatisfiable core [2020-12-03 12:30:24,180 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-03 12:30:24,271 INFO L134 CoverageAnalysis]: Checked inductivity of 388 backedges. 151 proven. 21 refuted. 0 times theorem prover too weak. 216 trivial. 0 not checked. [2020-12-03 12:30:24,274 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-03 12:30:24,427 INFO L134 CoverageAnalysis]: Checked inductivity of 388 backedges. 151 proven. 21 refuted. 0 times theorem prover too weak. 216 trivial. 0 not checked. [2020-12-03 12:30:24,428 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2018144410] [2020-12-03 12:30:24,432 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2020-12-03 12:30:24,433 INFO L166 IcfgInterpreter]: Building call graph [2020-12-03 12:30:24,433 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-12-03 12:30:24,434 INFO L176 IcfgInterpreter]: Starting interpretation [2020-12-03 12:30:24,434 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-12-03 12:30:24,834 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) [2020-12-03 12:30:24,835 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-12-03 12:30:24,835 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 17 [2020-12-03 12:30:24,836 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1536616004] [2020-12-03 12:30:24,837 INFO L461 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-12-03 12:30:24,838 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-03 12:30:24,839 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-12-03 12:30:24,839 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=85, Invalid=187, Unknown=0, NotChecked=0, Total=272 [2020-12-03 12:30:24,839 INFO L87 Difference]: Start difference. First operand 37 states and 41 transitions. Second operand 17 states. [2020-12-03 12:30:25,035 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-03 12:30:25,037 INFO L93 Difference]: Finished difference Result 81 states and 104 transitions. [2020-12-03 12:30:25,038 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-12-03 12:30:25,038 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 36 [2020-12-03 12:30:25,044 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-03 12:30:25,045 INFO L225 Difference]: With dead ends: 81 [2020-12-03 12:30:25,046 INFO L226 Difference]: Without dead ends: 53 [2020-12-03 12:30:25,047 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 63 SyntacticMatches, 1 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=111, Invalid=231, Unknown=0, NotChecked=0, Total=342 [2020-12-03 12:30:25,048 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-12-03 12:30:25,056 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 53. [2020-12-03 12:30:25,056 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2020-12-03 12:30:25,060 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 57 transitions. [2020-12-03 12:30:25,060 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 57 transitions. Word has length 36 [2020-12-03 12:30:25,061 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-03 12:30:25,061 INFO L481 AbstractCegarLoop]: Abstraction has 53 states and 57 transitions. [2020-12-03 12:30:25,061 INFO L482 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-12-03 12:30:25,061 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 57 transitions. [2020-12-03 12:30:25,065 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2020-12-03 12:30:25,065 INFO L414 BasicCegarLoop]: Found error trace [2020-12-03 12:30:25,065 INFO L422 BasicCegarLoop]: trace histogram [40, 4, 4, 1, 1, 1, 1] [2020-12-03 12:30:25,289 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable82,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-03 12:30:25,290 INFO L429 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-03 12:30:25,290 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-03 12:30:25,290 INFO L82 PathProgramCache]: Analyzing trace with hash 1277342560, now seen corresponding path program 4 times [2020-12-03 12:30:25,290 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-03 12:30:25,290 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [154515524] [2020-12-03 12:30:25,290 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-03 12:30:25,379 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-03 12:30:25,520 INFO L134 CoverageAnalysis]: Checked inductivity of 956 backedges. 0 proven. 736 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2020-12-03 12:30:25,521 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [154515524] [2020-12-03 12:30:25,521 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [259995062] [2020-12-03 12:30:25,521 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_8923e42c-1e2a-4b87-a77a-1c566f37eafc/bin/utaipan/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-03 12:30:25,592 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-03 12:30:25,594 INFO L263 TraceCheckSpWp]: Trace formula consists of 187 conjuncts, 11 conjunts are in the unsatisfiable core [2020-12-03 12:30:25,598 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-03 12:30:25,716 INFO L134 CoverageAnalysis]: Checked inductivity of 956 backedges. 0 proven. 736 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2020-12-03 12:30:25,716 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-03 12:30:25,848 INFO L134 CoverageAnalysis]: Checked inductivity of 956 backedges. 0 proven. 736 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2020-12-03 12:30:25,848 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1039110116] [2020-12-03 12:30:25,851 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2020-12-03 12:30:25,851 INFO L166 IcfgInterpreter]: Building call graph [2020-12-03 12:30:25,852 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-12-03 12:30:25,852 INFO L176 IcfgInterpreter]: Starting interpretation [2020-12-03 12:30:25,852 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-12-03 12:30:26,287 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) [2020-12-03 12:30:26,291 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-12-03 12:30:26,291 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 12 [2020-12-03 12:30:26,291 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1509946206] [2020-12-03 12:30:26,293 INFO L461 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-12-03 12:30:26,293 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-03 12:30:26,294 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-12-03 12:30:26,294 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=98, Unknown=0, NotChecked=0, Total=156 [2020-12-03 12:30:26,294 INFO L87 Difference]: Start difference. First operand 53 states and 57 transitions. Second operand 13 states. [2020-12-03 12:30:26,660 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-03 12:30:26,660 INFO L93 Difference]: Finished difference Result 128 states and 143 transitions. [2020-12-03 12:30:26,661 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-12-03 12:30:26,661 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 52 [2020-12-03 12:30:26,661 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-03 12:30:26,663 INFO L225 Difference]: With dead ends: 128 [2020-12-03 12:30:26,663 INFO L226 Difference]: Without dead ends: 125 [2020-12-03 12:30:26,663 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 112 GetRequests, 96 SyntacticMatches, 1 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=110, Invalid=162, Unknown=0, NotChecked=0, Total=272 [2020-12-03 12:30:26,664 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 125 states. [2020-12-03 12:30:26,682 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 125 to 125. [2020-12-03 12:30:26,683 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 125 states. [2020-12-03 12:30:26,684 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 125 states to 125 states and 135 transitions. [2020-12-03 12:30:26,685 INFO L78 Accepts]: Start accepts. Automaton has 125 states and 135 transitions. Word has length 52 [2020-12-03 12:30:26,685 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-03 12:30:26,685 INFO L481 AbstractCegarLoop]: Abstraction has 125 states and 135 transitions. [2020-12-03 12:30:26,685 INFO L482 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-12-03 12:30:26,686 INFO L276 IsEmpty]: Start isEmpty. Operand 125 states and 135 transitions. [2020-12-03 12:30:26,687 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2020-12-03 12:30:26,688 INFO L414 BasicCegarLoop]: Found error trace [2020-12-03 12:30:26,688 INFO L422 BasicCegarLoop]: trace histogram [100, 10, 10, 1, 1, 1, 1] [2020-12-03 12:30:26,901 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable128,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-03 12:30:26,902 INFO L429 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-03 12:30:26,902 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-03 12:30:26,902 INFO L82 PathProgramCache]: Analyzing trace with hash -1533680300, now seen corresponding path program 5 times [2020-12-03 12:30:26,902 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-03 12:30:26,902 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1416334520] [2020-12-03 12:30:26,902 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-03 12:30:27,013 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-03 12:30:27,357 INFO L134 CoverageAnalysis]: Checked inductivity of 6050 backedges. 0 proven. 5500 refuted. 0 times theorem prover too weak. 550 trivial. 0 not checked. [2020-12-03 12:30:27,357 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1416334520] [2020-12-03 12:30:27,358 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [525246580] [2020-12-03 12:30:27,358 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_8923e42c-1e2a-4b87-a77a-1c566f37eafc/bin/utaipan/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-03 12:30:27,641 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 13 check-sat command(s) [2020-12-03 12:30:27,641 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-03 12:30:27,643 INFO L263 TraceCheckSpWp]: Trace formula consists of 115 conjuncts, 10 conjunts are in the unsatisfiable core [2020-12-03 12:30:27,648 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-03 12:30:28,012 INFO L134 CoverageAnalysis]: Checked inductivity of 6050 backedges. 1099 proven. 0 refuted. 0 times theorem prover too weak. 4951 trivial. 0 not checked. [2020-12-03 12:30:28,012 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-03 12:30:28,229 INFO L134 CoverageAnalysis]: Checked inductivity of 6050 backedges. 1099 proven. 0 refuted. 0 times theorem prover too weak. 4951 trivial. 0 not checked. [2020-12-03 12:30:28,229 INFO L219 FreeRefinementEngine]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2020-12-03 12:30:28,230 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5, 5] imperfect sequences [12] total 19 [2020-12-03 12:30:28,230 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1232867622] [2020-12-03 12:30:28,231 INFO L461 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-12-03 12:30:28,231 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-03 12:30:28,232 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-12-03 12:30:28,232 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=91, Invalid=251, Unknown=0, NotChecked=0, Total=342 [2020-12-03 12:30:28,233 INFO L87 Difference]: Start difference. First operand 125 states and 135 transitions. Second operand 8 states. [2020-12-03 12:30:28,376 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-03 12:30:28,377 INFO L93 Difference]: Finished difference Result 125 states and 135 transitions. [2020-12-03 12:30:28,377 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-12-03 12:30:28,377 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 124 [2020-12-03 12:30:28,378 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-03 12:30:28,378 INFO L225 Difference]: With dead ends: 125 [2020-12-03 12:30:28,378 INFO L226 Difference]: Without dead ends: 0 [2020-12-03 12:30:28,379 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 260 GetRequests, 241 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=112, Invalid=308, Unknown=0, NotChecked=0, Total=420 [2020-12-03 12:30:28,379 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-12-03 12:30:28,380 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-12-03 12:30:28,380 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-12-03 12:30:28,380 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-12-03 12:30:28,380 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 124 [2020-12-03 12:30:28,380 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-03 12:30:28,380 INFO L481 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-12-03 12:30:28,380 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-12-03 12:30:28,380 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-12-03 12:30:28,381 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-12-03 12:30:28,584 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable168 [2020-12-03 12:30:28,586 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-12-03 12:30:28,707 INFO L262 CegarLoopResult]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2020-12-03 12:30:28,708 INFO L258 CegarLoopResult]: At program point L19-2(lines 19 21) the Hoare annotation is: (or (= ULTIMATE.start_main_~x~0 0) (and (< (mod (+ ULTIMATE.start_main_~x~0 4294967295) 4294967296) 268435455) (< (mod ULTIMATE.start_main_~x~0 4294967296) 268435455))) [2020-12-03 12:30:28,708 INFO L262 CegarLoopResult]: For program point L7(line 7) no Hoare annotation was computed. [2020-12-03 12:30:28,708 INFO L262 CegarLoopResult]: For program point ULTIMATE.startENTRY(line -1) no Hoare annotation was computed. [2020-12-03 12:30:28,708 INFO L262 CegarLoopResult]: For program point ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION(line 7) no Hoare annotation was computed. [2020-12-03 12:30:28,708 INFO L258 CegarLoopResult]: At program point L16-2(lines 16 24) the Hoare annotation is: (or (and (= ULTIMATE.start_main_~x~0 0) (= ULTIMATE.start_main_~y~0 0)) (< (mod (+ ULTIMATE.start_main_~x~0 4294967295) 4294967296) 268435455)) [2020-12-03 12:30:28,708 INFO L262 CegarLoopResult]: For program point L6(lines 6 8) no Hoare annotation was computed. [2020-12-03 12:30:28,709 INFO L265 CegarLoopResult]: At program point L6-2(lines 1 27) the Hoare annotation is: true [2020-12-03 12:30:28,725 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 03.12 12:30:28 BoogieIcfgContainer [2020-12-03 12:30:28,725 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-12-03 12:30:28,726 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2020-12-03 12:30:28,726 INFO L271 PluginConnector]: Initializing Witness Printer... [2020-12-03 12:30:28,726 INFO L275 PluginConnector]: Witness Printer initialized [2020-12-03 12:30:28,727 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.12 12:30:20" (3/4) ... [2020-12-03 12:30:28,730 INFO L137 WitnessPrinter]: Generating witness for correct program [2020-12-03 12:30:28,738 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 11 nodes and edges [2020-12-03 12:30:28,738 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 7 nodes and edges [2020-12-03 12:30:28,739 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 1 nodes and edges [2020-12-03 12:30:28,739 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 1 nodes and edges [2020-12-03 12:30:28,769 INFO L141 WitnessManager]: Wrote witness to /tmp/vcloud-vcloud-master/worker/run_dir_8923e42c-1e2a-4b87-a77a-1c566f37eafc/bin/utaipan/witness.graphml [2020-12-03 12:30:28,769 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2020-12-03 12:30:28,770 INFO L168 Benchmark]: Toolchain (without parser) took 9049.07 ms. Allocated memory was 94.4 MB in the beginning and 188.7 MB in the end (delta: 94.4 MB). Free memory was 66.4 MB in the beginning and 67.8 MB in the end (delta: -1.4 MB). Peak memory consumption was 92.4 MB. Max. memory is 16.1 GB. [2020-12-03 12:30:28,771 INFO L168 Benchmark]: CDTParser took 0.20 ms. Allocated memory is still 94.4 MB. Free memory is still 52.2 MB. There was no memory consumed. Max. memory is 16.1 GB. [2020-12-03 12:30:28,771 INFO L168 Benchmark]: CACSL2BoogieTranslator took 258.89 ms. Allocated memory is still 94.4 MB. Free memory was 66.1 MB in the beginning and 72.0 MB in the end (delta: -5.9 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. [2020-12-03 12:30:28,772 INFO L168 Benchmark]: Boogie Procedure Inliner took 33.14 ms. Allocated memory is still 94.4 MB. Free memory was 72.0 MB in the beginning and 70.6 MB in the end (delta: 1.4 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2020-12-03 12:30:28,772 INFO L168 Benchmark]: Boogie Preprocessor took 23.51 ms. Allocated memory is still 94.4 MB. Free memory was 70.6 MB in the beginning and 69.9 MB in the end (delta: 744.8 kB). There was no memory consumed. Max. memory is 16.1 GB. [2020-12-03 12:30:28,773 INFO L168 Benchmark]: RCFGBuilder took 395.65 ms. Allocated memory is still 94.4 MB. Free memory was 69.5 MB in the beginning and 55.9 MB in the end (delta: 13.6 MB). Peak memory consumption was 14.7 MB. Max. memory is 16.1 GB. [2020-12-03 12:30:28,773 INFO L168 Benchmark]: TraceAbstraction took 8286.69 ms. Allocated memory was 94.4 MB in the beginning and 188.7 MB in the end (delta: 94.4 MB). Free memory was 55.6 MB in the beginning and 70.9 MB in the end (delta: -15.3 MB). Peak memory consumption was 80.8 MB. Max. memory is 16.1 GB. [2020-12-03 12:30:28,774 INFO L168 Benchmark]: Witness Printer took 43.76 ms. Allocated memory is still 188.7 MB. Free memory was 69.9 MB in the beginning and 67.8 MB in the end (delta: 2.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2020-12-03 12:30:28,776 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.20 ms. Allocated memory is still 94.4 MB. Free memory is still 52.2 MB. There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 258.89 ms. Allocated memory is still 94.4 MB. Free memory was 66.1 MB in the beginning and 72.0 MB in the end (delta: -5.9 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. * Boogie Procedure Inliner took 33.14 ms. Allocated memory is still 94.4 MB. Free memory was 72.0 MB in the beginning and 70.6 MB in the end (delta: 1.4 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * Boogie Preprocessor took 23.51 ms. Allocated memory is still 94.4 MB. Free memory was 70.6 MB in the beginning and 69.9 MB in the end (delta: 744.8 kB). There was no memory consumed. Max. memory is 16.1 GB. * RCFGBuilder took 395.65 ms. Allocated memory is still 94.4 MB. Free memory was 69.5 MB in the beginning and 55.9 MB in the end (delta: 13.6 MB). Peak memory consumption was 14.7 MB. Max. memory is 16.1 GB. * TraceAbstraction took 8286.69 ms. Allocated memory was 94.4 MB in the beginning and 188.7 MB in the end (delta: 94.4 MB). Free memory was 55.6 MB in the beginning and 70.9 MB in the end (delta: -15.3 MB). Peak memory consumption was 80.8 MB. Max. memory is 16.1 GB. * Witness Printer took 43.76 ms. Allocated memory is still 188.7 MB. Free memory was 69.9 MB in the beginning and 67.8 MB in the end (delta: 2.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 7]: 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: 19]: Loop Invariant Derived loop invariant: x == 0 || ((x + 4294967295) % 4294967296 < 268435455 && x % 4294967296 < 268435455) - InvariantResult [Line: 16]: Loop Invariant Derived loop invariant: (x == 0 && y == 0) || (x + 4294967295) % 4294967296 < 268435455 - InvariantResult [Line: 1]: Loop Invariant Derived loop invariant: 1 - StatisticsResult: Ultimate Automizer benchmark data CFG has 1 procedures, 8 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 8.0s, OverallIterations: 7, TraceHistogramMax: 100, AutomataDifference: 1.1s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.1s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 41 SDtfs, 37 SDslu, 97 SDs, 0 SdLazy, 209 SolverSat, 64 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.2s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 527 GetRequests, 447 SyntacticMatches, 3 SemanticMatches, 77 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 138 ImplicationChecksByTransitivity, 1.6s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=125occurred in iteration=6, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 7 MinimizatonAttempts, 1 StatesRemovedByMinimization, 1 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 3 LocationsWithAnnotation, 3 PreInvPairs, 125 NumberOfFragments, 33 HoareAnnotationTreeSize, 3 FomulaSimplifications, 3255 FormulaSimplificationTreeSizeReduction, 0.0s HoareSimplificationTime, 3 FomulaSimplificationsInter, 11 FormulaSimplificationTreeSizeReductionInter, 0.0s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.1s SsaConstructionTime, 0.7s SatisfiabilityAnalysisTime, 2.1s InterpolantComputationTime, 488 NumberOfCodeBlocks, 384 NumberOfCodeBlocksAsserted, 29 NumberOfCheckSat, 710 ConstructedInterpolants, 0 QuantifiedInterpolants, 221024 SizeOfPredicates, 9 NumberOfNonLiveVariables, 560 ConjunctsInSsa, 52 ConjunctsInUnsatCore, 17 InterpolantComputations, 4 PerfectInterpolantSequences, 14633/22417 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...