./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/loop-simple/nested_3.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_104329bf-0c9d-4ee2-9bba-23e5043572ba/bin/utaipan/data/config -Xmx15G -Xms4m -jar /tmp/vcloud-vcloud-master/worker/run_dir_104329bf-0c9d-4ee2-9bba-23e5043572ba/bin/utaipan/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/run_dir_104329bf-0c9d-4ee2-9bba-23e5043572ba/bin/utaipan/data -tc /tmp/vcloud-vcloud-master/worker/run_dir_104329bf-0c9d-4ee2-9bba-23e5043572ba/bin/utaipan/config/TaipanReach.xml -i ../../sv-benchmarks/c/loop-simple/nested_3.c -s /tmp/vcloud-vcloud-master/worker/run_dir_104329bf-0c9d-4ee2-9bba-23e5043572ba/bin/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/run_dir_104329bf-0c9d-4ee2-9bba-23e5043572ba/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 e63f4150318242871d0ac34a0d1b61fbf23907ae ............................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... 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 12:35:18,424 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-12-03 12:35:18,426 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-12-03 12:35:18,504 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-12-03 12:35:18,506 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-12-03 12:35:18,516 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-12-03 12:35:18,518 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-12-03 12:35:18,530 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-12-03 12:35:18,533 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-12-03 12:35:18,541 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-12-03 12:35:18,543 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-12-03 12:35:18,545 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-12-03 12:35:18,546 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-12-03 12:35:18,549 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-12-03 12:35:18,551 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-12-03 12:35:18,553 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-12-03 12:35:18,555 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-12-03 12:35:18,559 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-12-03 12:35:18,562 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-12-03 12:35:18,568 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-12-03 12:35:18,572 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-12-03 12:35:18,573 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-12-03 12:35:18,576 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-12-03 12:35:18,577 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-12-03 12:35:18,582 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-12-03 12:35:18,583 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-12-03 12:35:18,583 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-12-03 12:35:18,586 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-12-03 12:35:18,587 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-12-03 12:35:18,588 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-12-03 12:35:18,588 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-12-03 12:35:18,590 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-12-03 12:35:18,593 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-12-03 12:35:18,594 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-12-03 12:35:18,595 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-12-03 12:35:18,596 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-12-03 12:35:18,597 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-12-03 12:35:18,597 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-12-03 12:35:18,597 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-12-03 12:35:18,599 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-12-03 12:35:18,600 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-12-03 12:35:18,602 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud-vcloud-master/worker/run_dir_104329bf-0c9d-4ee2-9bba-23e5043572ba/bin/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf [2020-12-03 12:35:18,656 INFO L113 SettingsManager]: Loading preferences was successful [2020-12-03 12:35:18,656 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-12-03 12:35:18,658 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2020-12-03 12:35:18,658 INFO L138 SettingsManager]: * User list type=DISABLED [2020-12-03 12:35:18,658 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2020-12-03 12:35:18,659 INFO L138 SettingsManager]: * Explicit value domain=true [2020-12-03 12:35:18,659 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2020-12-03 12:35:18,659 INFO L138 SettingsManager]: * Octagon Domain=false [2020-12-03 12:35:18,659 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2020-12-03 12:35:18,660 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2020-12-03 12:35:18,661 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2020-12-03 12:35:18,661 INFO L138 SettingsManager]: * Interval Domain=false [2020-12-03 12:35:18,662 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2020-12-03 12:35:18,662 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2020-12-03 12:35:18,662 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2020-12-03 12:35:18,663 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-12-03 12:35:18,663 INFO L138 SettingsManager]: * sizeof long=4 [2020-12-03 12:35:18,664 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-12-03 12:35:18,664 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-12-03 12:35:18,664 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-12-03 12:35:18,665 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-12-03 12:35:18,665 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-12-03 12:35:18,665 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-12-03 12:35:18,665 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2020-12-03 12:35:18,666 INFO L138 SettingsManager]: * sizeof long double=12 [2020-12-03 12:35:18,666 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-12-03 12:35:18,666 INFO L138 SettingsManager]: * Use constant arrays=true [2020-12-03 12:35:18,666 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-12-03 12:35:18,667 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-12-03 12:35:18,667 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-12-03 12:35:18,667 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-12-03 12:35:18,668 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-12-03 12:35:18,668 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-12-03 12:35:18,668 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-12-03 12:35:18,669 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2020-12-03 12:35:18,669 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-12-03 12:35:18,669 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-12-03 12:35:18,670 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-12-03 12:35:18,670 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2020-12-03 12:35:18,670 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_104329bf-0c9d-4ee2-9bba-23e5043572ba/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud-vcloud-master/worker/run_dir_104329bf-0c9d-4ee2-9bba-23e5043572ba/bin/utaipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> e63f4150318242871d0ac34a0d1b61fbf23907ae [2020-12-03 12:35:18,975 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-12-03 12:35:19,023 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-12-03 12:35:19,028 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-12-03 12:35:19,030 INFO L271 PluginConnector]: Initializing CDTParser... [2020-12-03 12:35:19,031 INFO L275 PluginConnector]: CDTParser initialized [2020-12-03 12:35:19,032 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/run_dir_104329bf-0c9d-4ee2-9bba-23e5043572ba/bin/utaipan/../../sv-benchmarks/c/loop-simple/nested_3.c [2020-12-03 12:35:19,126 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_104329bf-0c9d-4ee2-9bba-23e5043572ba/bin/utaipan/data/36f5d8e7a/8655e4a9500b4f75b2e44e0ea7f8d58a/FLAG696fbf258 [2020-12-03 12:35:19,703 INFO L306 CDTParser]: Found 1 translation units. [2020-12-03 12:35:19,706 INFO L160 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/run_dir_104329bf-0c9d-4ee2-9bba-23e5043572ba/sv-benchmarks/c/loop-simple/nested_3.c [2020-12-03 12:35:19,722 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_104329bf-0c9d-4ee2-9bba-23e5043572ba/bin/utaipan/data/36f5d8e7a/8655e4a9500b4f75b2e44e0ea7f8d58a/FLAG696fbf258 [2020-12-03 12:35:20,063 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/run_dir_104329bf-0c9d-4ee2-9bba-23e5043572ba/bin/utaipan/data/36f5d8e7a/8655e4a9500b4f75b2e44e0ea7f8d58a [2020-12-03 12:35:20,066 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-12-03 12:35:20,068 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2020-12-03 12:35:20,070 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-12-03 12:35:20,070 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-12-03 12:35:20,074 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-12-03 12:35:20,075 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 03.12 12:35:20" (1/1) ... [2020-12-03 12:35:20,077 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2496b1bf and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.12 12:35:20, skipping insertion in model container [2020-12-03 12:35:20,078 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 03.12 12:35:20" (1/1) ... [2020-12-03 12:35:20,086 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-12-03 12:35:20,101 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-12-03 12:35:20,274 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_104329bf-0c9d-4ee2-9bba-23e5043572ba/sv-benchmarks/c/loop-simple/nested_3.c[784,797] [2020-12-03 12:35:20,277 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-03 12:35:20,288 INFO L203 MainTranslator]: Completed pre-run [2020-12-03 12:35:20,305 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_104329bf-0c9d-4ee2-9bba-23e5043572ba/sv-benchmarks/c/loop-simple/nested_3.c[784,797] [2020-12-03 12:35:20,306 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-03 12:35:20,320 INFO L208 MainTranslator]: Completed translation [2020-12-03 12:35:20,321 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.12 12:35:20 WrapperNode [2020-12-03 12:35:20,322 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-12-03 12:35:20,323 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2020-12-03 12:35:20,324 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2020-12-03 12:35:20,324 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2020-12-03 12:35:20,331 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.12 12:35:20" (1/1) ... [2020-12-03 12:35:20,342 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.12 12:35:20" (1/1) ... [2020-12-03 12:35:20,360 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2020-12-03 12:35:20,362 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-12-03 12:35:20,362 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-12-03 12:35:20,363 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-12-03 12:35:20,370 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.12 12:35:20" (1/1) ... [2020-12-03 12:35:20,371 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.12 12:35:20" (1/1) ... [2020-12-03 12:35:20,384 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.12 12:35:20" (1/1) ... [2020-12-03 12:35:20,385 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.12 12:35:20" (1/1) ... [2020-12-03 12:35:20,388 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.12 12:35:20" (1/1) ... [2020-12-03 12:35:20,394 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.12 12:35:20" (1/1) ... [2020-12-03 12:35:20,400 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.12 12:35:20" (1/1) ... [2020-12-03 12:35:20,402 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-12-03 12:35:20,403 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-12-03 12:35:20,404 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-12-03 12:35:20,404 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-12-03 12:35:20,405 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.12 12:35:20" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_104329bf-0c9d-4ee2-9bba-23e5043572ba/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 12:35:20,495 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-12-03 12:35:20,495 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-12-03 12:35:20,495 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-12-03 12:35:20,496 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-12-03 12:35:20,870 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-12-03 12:35:20,870 INFO L299 CfgBuilder]: Removed 7 assume(true) statements. [2020-12-03 12:35:20,872 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.12 12:35:20 BoogieIcfgContainer [2020-12-03 12:35:20,873 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-12-03 12:35:20,874 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-12-03 12:35:20,874 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-12-03 12:35:20,878 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-12-03 12:35:20,878 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 03.12 12:35:20" (1/3) ... [2020-12-03 12:35:20,879 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@57764efe and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 03.12 12:35:20, skipping insertion in model container [2020-12-03 12:35:20,880 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.12 12:35:20" (2/3) ... [2020-12-03 12:35:20,880 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@57764efe and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 03.12 12:35:20, skipping insertion in model container [2020-12-03 12:35:20,880 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.12 12:35:20" (3/3) ... [2020-12-03 12:35:20,882 INFO L111 eAbstractionObserver]: Analyzing ICFG nested_3.c [2020-12-03 12:35:20,898 INFO L180 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-12-03 12:35:20,902 INFO L192 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-12-03 12:35:20,915 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-12-03 12:35:20,942 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-12-03 12:35:20,943 INFO L378 AbstractCegarLoop]: Hoare is true [2020-12-03 12:35:20,943 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-12-03 12:35:20,943 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-12-03 12:35:20,943 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-12-03 12:35:20,943 INFO L382 AbstractCegarLoop]: Difference is false [2020-12-03 12:35:20,943 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-12-03 12:35:20,944 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-12-03 12:35:20,958 INFO L276 IsEmpty]: Start isEmpty. Operand 9 states. [2020-12-03 12:35:20,963 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2020-12-03 12:35:20,964 INFO L414 BasicCegarLoop]: Found error trace [2020-12-03 12:35:20,964 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1] [2020-12-03 12:35:20,965 INFO L429 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-03 12:35:20,971 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-03 12:35:20,971 INFO L82 PathProgramCache]: Analyzing trace with hash 2557605, now seen corresponding path program 1 times [2020-12-03 12:35:20,982 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-03 12:35:20,983 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [716151731] [2020-12-03 12:35:20,983 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-03 12:35:21,088 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-03 12:35:21,158 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 12:35:21,159 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [716151731] [2020-12-03 12:35:21,160 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-03 12:35:21,161 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-12-03 12:35:21,162 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [523762666] [2020-12-03 12:35:21,166 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-12-03 12:35:21,167 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-03 12:35:21,181 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-12-03 12:35:21,182 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-12-03 12:35:21,184 INFO L87 Difference]: Start difference. First operand 9 states. Second operand 3 states. [2020-12-03 12:35:21,227 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-03 12:35:21,228 INFO L93 Difference]: Finished difference Result 17 states and 23 transitions. [2020-12-03 12:35:21,229 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-12-03 12:35:21,230 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 4 [2020-12-03 12:35:21,231 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-03 12:35:21,240 INFO L225 Difference]: With dead ends: 17 [2020-12-03 12:35:21,240 INFO L226 Difference]: Without dead ends: 10 [2020-12-03 12:35:21,243 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 12:35:21,261 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10 states. [2020-12-03 12:35:21,285 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10 to 8. [2020-12-03 12:35:21,286 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 8 states. [2020-12-03 12:35:21,287 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8 states to 8 states and 10 transitions. [2020-12-03 12:35:21,289 INFO L78 Accepts]: Start accepts. Automaton has 8 states and 10 transitions. Word has length 4 [2020-12-03 12:35:21,289 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-03 12:35:21,289 INFO L481 AbstractCegarLoop]: Abstraction has 8 states and 10 transitions. [2020-12-03 12:35:21,290 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-12-03 12:35:21,290 INFO L276 IsEmpty]: Start isEmpty. Operand 8 states and 10 transitions. [2020-12-03 12:35:21,290 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2020-12-03 12:35:21,291 INFO L414 BasicCegarLoop]: Found error trace [2020-12-03 12:35:21,291 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2020-12-03 12:35:21,291 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-12-03 12:35:21,292 INFO L429 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-03 12:35:21,293 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-03 12:35:21,293 INFO L82 PathProgramCache]: Analyzing trace with hash -1879100363, now seen corresponding path program 1 times [2020-12-03 12:35:21,293 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-03 12:35:21,294 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1516799064] [2020-12-03 12:35:21,294 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-03 12:35:21,310 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-03 12:35:21,344 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 12:35:21,345 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1516799064] [2020-12-03 12:35:21,345 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-03 12:35:21,345 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-12-03 12:35:21,346 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [473581190] [2020-12-03 12:35:21,347 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-12-03 12:35:21,347 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-03 12:35:21,348 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-12-03 12:35:21,349 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-12-03 12:35:21,349 INFO L87 Difference]: Start difference. First operand 8 states and 10 transitions. Second operand 3 states. [2020-12-03 12:35:21,396 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-03 12:35:21,396 INFO L93 Difference]: Finished difference Result 16 states and 22 transitions. [2020-12-03 12:35:21,398 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-12-03 12:35:21,398 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 6 [2020-12-03 12:35:21,399 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-03 12:35:21,399 INFO L225 Difference]: With dead ends: 16 [2020-12-03 12:35:21,400 INFO L226 Difference]: Without dead ends: 10 [2020-12-03 12:35:21,401 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-12-03 12:35:21,403 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10 states. [2020-12-03 12:35:21,407 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10 to 9. [2020-12-03 12:35:21,407 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 9 states. [2020-12-03 12:35:21,408 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9 states to 9 states and 11 transitions. [2020-12-03 12:35:21,408 INFO L78 Accepts]: Start accepts. Automaton has 9 states and 11 transitions. Word has length 6 [2020-12-03 12:35:21,409 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-03 12:35:21,409 INFO L481 AbstractCegarLoop]: Abstraction has 9 states and 11 transitions. [2020-12-03 12:35:21,409 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-12-03 12:35:21,410 INFO L276 IsEmpty]: Start isEmpty. Operand 9 states and 11 transitions. [2020-12-03 12:35:21,410 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2020-12-03 12:35:21,410 INFO L414 BasicCegarLoop]: Found error trace [2020-12-03 12:35:21,411 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2020-12-03 12:35:21,411 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-12-03 12:35:21,411 INFO L429 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-03 12:35:21,412 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-03 12:35:21,412 INFO L82 PathProgramCache]: Analyzing trace with hash 1224801311, now seen corresponding path program 1 times [2020-12-03 12:35:21,413 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-03 12:35:21,414 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1067761792] [2020-12-03 12:35:21,418 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-03 12:35:21,445 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-03 12:35:21,486 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-03 12:35:21,487 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1067761792] [2020-12-03 12:35:21,487 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-03 12:35:21,488 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-12-03 12:35:21,488 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1906134877] [2020-12-03 12:35:21,488 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-12-03 12:35:21,489 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-03 12:35:21,490 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-12-03 12:35:21,490 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-12-03 12:35:21,491 INFO L87 Difference]: Start difference. First operand 9 states and 11 transitions. Second operand 3 states. [2020-12-03 12:35:21,512 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-03 12:35:21,512 INFO L93 Difference]: Finished difference Result 17 states and 22 transitions. [2020-12-03 12:35:21,514 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-12-03 12:35:21,514 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 8 [2020-12-03 12:35:21,514 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-03 12:35:21,515 INFO L225 Difference]: With dead ends: 17 [2020-12-03 12:35:21,515 INFO L226 Difference]: Without dead ends: 10 [2020-12-03 12:35:21,516 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-12-03 12:35:21,516 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10 states. [2020-12-03 12:35:21,518 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10 to 10. [2020-12-03 12:35:21,519 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 10 states. [2020-12-03 12:35:21,519 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10 states to 10 states and 12 transitions. [2020-12-03 12:35:21,520 INFO L78 Accepts]: Start accepts. Automaton has 10 states and 12 transitions. Word has length 8 [2020-12-03 12:35:21,520 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-03 12:35:21,520 INFO L481 AbstractCegarLoop]: Abstraction has 10 states and 12 transitions. [2020-12-03 12:35:21,520 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-12-03 12:35:21,521 INFO L276 IsEmpty]: Start isEmpty. Operand 10 states and 12 transitions. [2020-12-03 12:35:21,521 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2020-12-03 12:35:21,521 INFO L414 BasicCegarLoop]: Found error trace [2020-12-03 12:35:21,522 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-03 12:35:21,522 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-12-03 12:35:21,522 INFO L429 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-03 12:35:21,523 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-03 12:35:21,523 INFO L82 PathProgramCache]: Analyzing trace with hash -855719839, now seen corresponding path program 1 times [2020-12-03 12:35:21,524 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-03 12:35:21,524 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1870928783] [2020-12-03 12:35:21,524 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-03 12:35:21,547 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-03 12:35:21,613 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-03 12:35:21,614 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1870928783] [2020-12-03 12:35:21,614 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1366329176] [2020-12-03 12:35:21,614 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_104329bf-0c9d-4ee2-9bba-23e5043572ba/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 12:35:21,703 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-03 12:35:21,713 INFO L263 TraceCheckSpWp]: Trace formula consists of 55 conjuncts, 3 conjunts are in the unsatisfiable core [2020-12-03 12:35:21,718 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-03 12:35:21,773 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-03 12:35:21,773 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-03 12:35:21,811 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-03 12:35:21,812 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1999595505] [2020-12-03 12:35:21,836 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2020-12-03 12:35:21,836 INFO L166 IcfgInterpreter]: Building call graph [2020-12-03 12:35:21,842 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-12-03 12:35:21,848 INFO L176 IcfgInterpreter]: Starting interpretation [2020-12-03 12:35:21,849 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-12-03 12:35:23,447 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 12:35:23,449 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-12-03 12:35:23,450 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 7 [2020-12-03 12:35:23,450 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [555357674] [2020-12-03 12:35:23,451 INFO L461 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-12-03 12:35:23,451 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-03 12:35:23,451 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-12-03 12:35:23,452 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2020-12-03 12:35:23,452 INFO L87 Difference]: Start difference. First operand 10 states and 12 transitions. Second operand 7 states. [2020-12-03 12:35:23,472 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-03 12:35:23,472 INFO L93 Difference]: Finished difference Result 21 states and 28 transitions. [2020-12-03 12:35:23,473 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-12-03 12:35:23,473 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 9 [2020-12-03 12:35:23,473 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-03 12:35:23,474 INFO L225 Difference]: With dead ends: 21 [2020-12-03 12:35:23,474 INFO L226 Difference]: Without dead ends: 13 [2020-12-03 12:35:23,474 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2020-12-03 12:35:23,475 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2020-12-03 12:35:23,477 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2020-12-03 12:35:23,477 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2020-12-03 12:35:23,477 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 15 transitions. [2020-12-03 12:35:23,478 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 15 transitions. Word has length 9 [2020-12-03 12:35:23,478 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-03 12:35:23,478 INFO L481 AbstractCegarLoop]: Abstraction has 13 states and 15 transitions. [2020-12-03 12:35:23,478 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-12-03 12:35:23,478 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 15 transitions. [2020-12-03 12:35:23,479 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-12-03 12:35:23,479 INFO L414 BasicCegarLoop]: Found error trace [2020-12-03 12:35:23,479 INFO L422 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-03 12:35:23,702 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-03 12:35:23,702 INFO L429 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-03 12:35:23,703 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-03 12:35:23,703 INFO L82 PathProgramCache]: Analyzing trace with hash 1014037663, now seen corresponding path program 2 times [2020-12-03 12:35:23,703 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-03 12:35:23,703 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1482977324] [2020-12-03 12:35:23,703 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-03 12:35:23,718 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-03 12:35:23,760 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2020-12-03 12:35:23,761 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1482977324] [2020-12-03 12:35:23,761 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1176438918] [2020-12-03 12:35:23,761 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_104329bf-0c9d-4ee2-9bba-23e5043572ba/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 12:35:23,833 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2020-12-03 12:35:23,833 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-03 12:35:23,834 INFO L263 TraceCheckSpWp]: Trace formula consists of 46 conjuncts, 3 conjunts are in the unsatisfiable core [2020-12-03 12:35:23,835 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-03 12:35:23,879 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2020-12-03 12:35:23,879 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-03 12:35:23,915 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2020-12-03 12:35:23,916 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [124823168] [2020-12-03 12:35:23,929 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2020-12-03 12:35:23,929 INFO L166 IcfgInterpreter]: Building call graph [2020-12-03 12:35:23,929 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-12-03 12:35:23,930 INFO L176 IcfgInterpreter]: Starting interpretation [2020-12-03 12:35:23,930 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-12-03 12:35:24,957 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 12:35:24,958 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-12-03 12:35:24,958 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 3, 3] total 8 [2020-12-03 12:35:24,959 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [608853223] [2020-12-03 12:35:24,960 INFO L461 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-12-03 12:35:24,960 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-03 12:35:24,961 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-12-03 12:35:24,963 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=36, Unknown=0, NotChecked=0, Total=56 [2020-12-03 12:35:24,963 INFO L87 Difference]: Start difference. First operand 13 states and 15 transitions. Second operand 8 states. [2020-12-03 12:35:25,141 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-03 12:35:25,143 INFO L93 Difference]: Finished difference Result 92 states and 117 transitions. [2020-12-03 12:35:25,147 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-12-03 12:35:25,147 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 12 [2020-12-03 12:35:25,148 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-03 12:35:25,150 INFO L225 Difference]: With dead ends: 92 [2020-12-03 12:35:25,150 INFO L226 Difference]: Without dead ends: 81 [2020-12-03 12:35:25,152 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=90, Invalid=150, Unknown=0, NotChecked=0, Total=240 [2020-12-03 12:35:25,153 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2020-12-03 12:35:25,169 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 61. [2020-12-03 12:35:25,169 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-12-03 12:35:25,177 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 73 transitions. [2020-12-03 12:35:25,177 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 73 transitions. Word has length 12 [2020-12-03 12:35:25,177 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-03 12:35:25,178 INFO L481 AbstractCegarLoop]: Abstraction has 61 states and 73 transitions. [2020-12-03 12:35:25,178 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-12-03 12:35:25,178 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 73 transitions. [2020-12-03 12:35:25,181 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2020-12-03 12:35:25,181 INFO L414 BasicCegarLoop]: Found error trace [2020-12-03 12:35:25,183 INFO L422 BasicCegarLoop]: trace histogram [32, 8, 8, 4, 4, 1, 1, 1, 1] [2020-12-03 12:35:25,410 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable112 [2020-12-03 12:35:25,410 INFO L429 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-03 12:35:25,411 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-03 12:35:25,411 INFO L82 PathProgramCache]: Analyzing trace with hash -1841698763, now seen corresponding path program 3 times [2020-12-03 12:35:25,411 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-03 12:35:25,411 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [857106015] [2020-12-03 12:35:25,411 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-03 12:35:25,453 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-03 12:35:25,527 INFO L134 CoverageAnalysis]: Checked inductivity of 856 backedges. 190 proven. 10 refuted. 0 times theorem prover too weak. 656 trivial. 0 not checked. [2020-12-03 12:35:25,528 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [857106015] [2020-12-03 12:35:25,528 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1960822259] [2020-12-03 12:35:25,528 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_104329bf-0c9d-4ee2-9bba-23e5043572ba/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 12:35:25,604 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-03 12:35:25,614 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-03 12:35:25,615 INFO L263 TraceCheckSpWp]: Trace formula consists of 173 conjuncts, 6 conjunts are in the unsatisfiable core [2020-12-03 12:35:25,619 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-03 12:35:25,707 INFO L134 CoverageAnalysis]: Checked inductivity of 856 backedges. 190 proven. 10 refuted. 0 times theorem prover too weak. 656 trivial. 0 not checked. [2020-12-03 12:35:25,707 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-03 12:35:25,818 INFO L134 CoverageAnalysis]: Checked inductivity of 856 backedges. 190 proven. 10 refuted. 0 times theorem prover too weak. 656 trivial. 0 not checked. [2020-12-03 12:35:25,819 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1351222759] [2020-12-03 12:35:25,822 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2020-12-03 12:35:25,822 INFO L166 IcfgInterpreter]: Building call graph [2020-12-03 12:35:25,823 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-12-03 12:35:25,823 INFO L176 IcfgInterpreter]: Starting interpretation [2020-12-03 12:35:25,823 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-12-03 12:35:26,613 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 12:35:26,614 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-12-03 12:35:26,614 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 9 [2020-12-03 12:35:26,614 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1506298240] [2020-12-03 12:35:26,616 INFO L461 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-12-03 12:35:26,616 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-03 12:35:26,617 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-12-03 12:35:26,617 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2020-12-03 12:35:26,617 INFO L87 Difference]: Start difference. First operand 61 states and 73 transitions. Second operand 9 states. [2020-12-03 12:35:26,664 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-03 12:35:26,664 INFO L93 Difference]: Finished difference Result 130 states and 169 transitions. [2020-12-03 12:35:26,665 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-12-03 12:35:26,665 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 60 [2020-12-03 12:35:26,665 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-03 12:35:26,668 INFO L225 Difference]: With dead ends: 130 [2020-12-03 12:35:26,668 INFO L226 Difference]: Without dead ends: 77 [2020-12-03 12:35:26,670 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 125 GetRequests, 117 SyntacticMatches, 1 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2020-12-03 12:35:26,671 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2020-12-03 12:35:26,684 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 77. [2020-12-03 12:35:26,685 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 77 states. [2020-12-03 12:35:26,686 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 89 transitions. [2020-12-03 12:35:26,686 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 89 transitions. Word has length 60 [2020-12-03 12:35:26,686 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-03 12:35:26,686 INFO L481 AbstractCegarLoop]: Abstraction has 77 states and 89 transitions. [2020-12-03 12:35:26,686 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-12-03 12:35:26,687 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 89 transitions. [2020-12-03 12:35:26,690 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2020-12-03 12:35:26,691 INFO L414 BasicCegarLoop]: Found error trace [2020-12-03 12:35:26,691 INFO L422 BasicCegarLoop]: trace histogram [48, 8, 8, 4, 4, 1, 1, 1, 1] [2020-12-03 12:35:26,904 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable221 [2020-12-03 12:35:26,904 INFO L429 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-03 12:35:26,904 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-03 12:35:26,904 INFO L82 PathProgramCache]: Analyzing trace with hash -1609731019, now seen corresponding path program 4 times [2020-12-03 12:35:26,904 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-03 12:35:26,905 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [487280633] [2020-12-03 12:35:26,905 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-03 12:35:26,957 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-03 12:35:27,026 INFO L134 CoverageAnalysis]: Checked inductivity of 1616 backedges. 619 proven. 52 refuted. 0 times theorem prover too weak. 945 trivial. 0 not checked. [2020-12-03 12:35:27,027 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [487280633] [2020-12-03 12:35:27,027 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2107696122] [2020-12-03 12:35:27,029 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_104329bf-0c9d-4ee2-9bba-23e5043572ba/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 12:35:27,113 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-03 12:35:27,114 INFO L263 TraceCheckSpWp]: Trace formula consists of 256 conjuncts, 4 conjunts are in the unsatisfiable core [2020-12-03 12:35:27,117 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-03 12:35:27,224 INFO L134 CoverageAnalysis]: Checked inductivity of 1616 backedges. 619 proven. 52 refuted. 0 times theorem prover too weak. 945 trivial. 0 not checked. [2020-12-03 12:35:27,224 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-03 12:35:27,339 INFO L134 CoverageAnalysis]: Checked inductivity of 1616 backedges. 619 proven. 52 refuted. 0 times theorem prover too weak. 945 trivial. 0 not checked. [2020-12-03 12:35:27,340 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1750392720] [2020-12-03 12:35:27,342 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2020-12-03 12:35:27,342 INFO L166 IcfgInterpreter]: Building call graph [2020-12-03 12:35:27,343 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-12-03 12:35:27,343 INFO L176 IcfgInterpreter]: Starting interpretation [2020-12-03 12:35:27,343 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-12-03 12:35:28,054 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 12:35:28,056 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-12-03 12:35:28,056 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 9 [2020-12-03 12:35:28,057 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1397159090] [2020-12-03 12:35:28,057 INFO L461 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-12-03 12:35:28,057 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-03 12:35:28,058 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-12-03 12:35:28,058 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2020-12-03 12:35:28,059 INFO L87 Difference]: Start difference. First operand 77 states and 89 transitions. Second operand 9 states. [2020-12-03 12:35:28,107 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-03 12:35:28,107 INFO L93 Difference]: Finished difference Result 263 states and 316 transitions. [2020-12-03 12:35:28,107 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-12-03 12:35:28,108 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 76 [2020-12-03 12:35:28,108 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-03 12:35:28,109 INFO L225 Difference]: With dead ends: 263 [2020-12-03 12:35:28,110 INFO L226 Difference]: Without dead ends: 205 [2020-12-03 12:35:28,110 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 155 GetRequests, 148 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2020-12-03 12:35:28,111 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 205 states. [2020-12-03 12:35:28,132 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 205 to 205. [2020-12-03 12:35:28,132 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 205 states. [2020-12-03 12:35:28,135 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 205 states to 205 states and 233 transitions. [2020-12-03 12:35:28,135 INFO L78 Accepts]: Start accepts. Automaton has 205 states and 233 transitions. Word has length 76 [2020-12-03 12:35:28,135 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-03 12:35:28,135 INFO L481 AbstractCegarLoop]: Abstraction has 205 states and 233 transitions. [2020-12-03 12:35:28,135 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-12-03 12:35:28,136 INFO L276 IsEmpty]: Start isEmpty. Operand 205 states and 233 transitions. [2020-12-03 12:35:28,139 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 205 [2020-12-03 12:35:28,139 INFO L414 BasicCegarLoop]: Found error trace [2020-12-03 12:35:28,139 INFO L422 BasicCegarLoop]: trace histogram [144, 24, 24, 4, 4, 1, 1, 1, 1] [2020-12-03 12:35:28,366 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable330,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-03 12:35:28,366 INFO L429 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-03 12:35:28,367 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-03 12:35:28,367 INFO L82 PathProgramCache]: Analyzing trace with hash 1792217813, now seen corresponding path program 5 times [2020-12-03 12:35:28,367 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-03 12:35:28,367 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1788499149] [2020-12-03 12:35:28,367 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-03 12:35:28,519 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-03 12:35:28,719 INFO L134 CoverageAnalysis]: Checked inductivity of 14416 backedges. 0 proven. 10888 refuted. 0 times theorem prover too weak. 3528 trivial. 0 not checked. [2020-12-03 12:35:28,719 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1788499149] [2020-12-03 12:35:28,719 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1312893467] [2020-12-03 12:35:28,720 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_104329bf-0c9d-4ee2-9bba-23e5043572ba/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 12:35:28,936 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 51 check-sat command(s) [2020-12-03 12:35:28,936 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-03 12:35:28,939 INFO L263 TraceCheckSpWp]: Trace formula consists of 340 conjuncts, 21 conjunts are in the unsatisfiable core [2020-12-03 12:35:28,946 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-03 12:35:29,390 INFO L134 CoverageAnalysis]: Checked inductivity of 14416 backedges. 5694 proven. 21 refuted. 0 times theorem prover too weak. 8701 trivial. 0 not checked. [2020-12-03 12:35:29,390 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-03 12:35:30,005 INFO L134 CoverageAnalysis]: Checked inductivity of 14416 backedges. 5443 proven. 272 refuted. 0 times theorem prover too weak. 8701 trivial. 0 not checked. [2020-12-03 12:35:30,005 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [279932928] [2020-12-03 12:35:30,010 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2020-12-03 12:35:30,010 INFO L166 IcfgInterpreter]: Building call graph [2020-12-03 12:35:30,011 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-12-03 12:35:30,011 INFO L176 IcfgInterpreter]: Starting interpretation [2020-12-03 12:35:30,012 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-12-03 12:35:30,688 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 12:35:30,688 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-12-03 12:35:30,689 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 13, 13] total 27 [2020-12-03 12:35:30,689 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [706880760] [2020-12-03 12:35:30,690 INFO L461 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-12-03 12:35:30,690 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-03 12:35:30,690 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-12-03 12:35:30,691 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=154, Invalid=548, Unknown=0, NotChecked=0, Total=702 [2020-12-03 12:35:30,691 INFO L87 Difference]: Start difference. First operand 205 states and 233 transitions. Second operand 27 states. [2020-12-03 12:35:32,720 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-03 12:35:32,720 INFO L93 Difference]: Finished difference Result 499 states and 572 transitions. [2020-12-03 12:35:32,720 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 66 states. [2020-12-03 12:35:32,721 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 204 [2020-12-03 12:35:32,722 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-03 12:35:32,722 INFO L225 Difference]: With dead ends: 499 [2020-12-03 12:35:32,722 INFO L226 Difference]: Without dead ends: 0 [2020-12-03 12:35:32,728 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 466 GetRequests, 386 SyntacticMatches, 1 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1699 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=1167, Invalid=5313, Unknown=0, NotChecked=0, Total=6480 [2020-12-03 12:35:32,728 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-12-03 12:35:32,728 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-12-03 12:35:32,728 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-12-03 12:35:32,729 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-12-03 12:35:32,729 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 204 [2020-12-03 12:35:32,729 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-03 12:35:32,729 INFO L481 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-12-03 12:35:32,729 INFO L482 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-12-03 12:35:32,729 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-12-03 12:35:32,729 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-12-03 12:35:32,950 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable439 [2020-12-03 12:35:32,951 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-12-03 12:35:33,354 WARN L197 SmtUtils]: Spent 363.00 ms on a formula simplification. DAG size of input: 347 DAG size of output: 101 [2020-12-03 12:35:33,830 WARN L197 SmtUtils]: Spent 392.00 ms on a formula simplification. DAG size of input: 90 DAG size of output: 27 [2020-12-03 12:35:33,833 INFO L262 CegarLoopResult]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2020-12-03 12:35:33,833 INFO L262 CegarLoopResult]: For program point L29(line 29) no Hoare annotation was computed. [2020-12-03 12:35:33,834 INFO L258 CegarLoopResult]: At program point L23-3(lines 23 25) the Hoare annotation is: (let ((.cse0 (< ULTIMATE.start_main_~a~0 6)) (.cse1 (< ULTIMATE.start_main_~b~0 6))) (or (and .cse0 (= ULTIMATE.start_main_~c~0 6) .cse1) (and .cse0 .cse1 (= ULTIMATE.start_main_~c~0 5)) (and .cse0 .cse1 (= ULTIMATE.start_main_~c~0 1)) (and (= ULTIMATE.start_main_~c~0 4) .cse0 .cse1) (and .cse0 .cse1 (= ULTIMATE.start_main_~c~0 0)) (and .cse0 (= ULTIMATE.start_main_~c~0 3) .cse1) (and .cse0 (= ULTIMATE.start_main_~c~0 2) .cse1))) [2020-12-03 12:35:33,836 INFO L258 CegarLoopResult]: At program point L21-3(lines 21 27) the Hoare annotation is: (and (= ULTIMATE.start_main_~c~0 6) (< ULTIMATE.start_main_~b~0 7) (<= 6 ULTIMATE.start_main_~b~0) (< ULTIMATE.start_main_~a~0 7)) [2020-12-03 12:35:33,836 INFO L262 CegarLoopResult]: For program point L21-4(lines 15 32) no Hoare annotation was computed. [2020-12-03 12:35:33,836 INFO L262 CegarLoopResult]: For program point ULTIMATE.startENTRY(line -1) no Hoare annotation was computed. [2020-12-03 12:35:33,836 INFO L265 CegarLoopResult]: At program point L28-1(lines 28 30) the Hoare annotation is: true [2020-12-03 12:35:33,836 INFO L262 CegarLoopResult]: For program point ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION(line 29) no Hoare annotation was computed. [2020-12-03 12:35:33,837 INFO L258 CegarLoopResult]: At program point L22-3(lines 22 26) the Hoare annotation is: (and (< ULTIMATE.start_main_~a~0 6) (= ULTIMATE.start_main_~c~0 6) (< ULTIMATE.start_main_~b~0 7)) [2020-12-03 12:35:33,858 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 03.12 12:35:33 BoogieIcfgContainer [2020-12-03 12:35:33,859 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-12-03 12:35:33,859 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2020-12-03 12:35:33,859 INFO L271 PluginConnector]: Initializing Witness Printer... [2020-12-03 12:35:33,860 INFO L275 PluginConnector]: Witness Printer initialized [2020-12-03 12:35:33,860 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.12 12:35:20" (3/4) ... [2020-12-03 12:35:33,863 INFO L137 WitnessPrinter]: Generating witness for correct program [2020-12-03 12:35:33,873 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 11 nodes and edges [2020-12-03 12:35:33,873 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 7 nodes and edges [2020-12-03 12:35:33,873 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 2 nodes and edges [2020-12-03 12:35:33,873 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 1 nodes and edges [2020-12-03 12:35:33,911 INFO L141 WitnessManager]: Wrote witness to /tmp/vcloud-vcloud-master/worker/run_dir_104329bf-0c9d-4ee2-9bba-23e5043572ba/bin/utaipan/witness.graphml [2020-12-03 12:35:33,911 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2020-12-03 12:35:33,915 INFO L168 Benchmark]: Toolchain (without parser) took 13844.41 ms. Allocated memory was 90.2 MB in the beginning and 281.0 MB in the end (delta: 190.8 MB). Free memory was 60.0 MB in the beginning and 249.0 MB in the end (delta: -189.0 MB). Peak memory consumption was 2.6 MB. Max. memory is 16.1 GB. [2020-12-03 12:35:33,915 INFO L168 Benchmark]: CDTParser took 0.30 ms. Allocated memory is still 90.2 MB. Free memory was 47.7 MB in the beginning and 47.6 MB in the end (delta: 38.7 kB). There was no memory consumed. Max. memory is 16.1 GB. [2020-12-03 12:35:33,916 INFO L168 Benchmark]: CACSL2BoogieTranslator took 252.85 ms. Allocated memory is still 90.2 MB. Free memory was 59.7 MB in the beginning and 68.2 MB in the end (delta: -8.5 MB). Peak memory consumption was 10.5 MB. Max. memory is 16.1 GB. [2020-12-03 12:35:33,916 INFO L168 Benchmark]: Boogie Procedure Inliner took 37.01 ms. Allocated memory is still 90.2 MB. Free memory was 68.2 MB in the beginning and 67.0 MB in the end (delta: 1.3 MB). There was no memory consumed. Max. memory is 16.1 GB. [2020-12-03 12:35:33,919 INFO L168 Benchmark]: Boogie Preprocessor took 40.94 ms. Allocated memory is still 90.2 MB. Free memory was 67.0 MB in the beginning and 65.8 MB in the end (delta: 1.2 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2020-12-03 12:35:33,919 INFO L168 Benchmark]: RCFGBuilder took 469.20 ms. Allocated memory is still 90.2 MB. Free memory was 65.8 MB in the beginning and 50.7 MB in the end (delta: 15.1 MB). Peak memory consumption was 14.7 MB. Max. memory is 16.1 GB. [2020-12-03 12:35:33,919 INFO L168 Benchmark]: TraceAbstraction took 12984.46 ms. Allocated memory was 90.2 MB in the beginning and 281.0 MB in the end (delta: 190.8 MB). Free memory was 50.3 MB in the beginning and 251.1 MB in the end (delta: -200.8 MB). Peak memory consumption was 153.1 MB. Max. memory is 16.1 GB. [2020-12-03 12:35:33,919 INFO L168 Benchmark]: Witness Printer took 52.20 ms. Allocated memory is still 281.0 MB. Free memory was 251.1 MB in the beginning and 249.0 MB in the end (delta: 2.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2020-12-03 12:35:33,921 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.30 ms. Allocated memory is still 90.2 MB. Free memory was 47.7 MB in the beginning and 47.6 MB in the end (delta: 38.7 kB). There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 252.85 ms. Allocated memory is still 90.2 MB. Free memory was 59.7 MB in the beginning and 68.2 MB in the end (delta: -8.5 MB). Peak memory consumption was 10.5 MB. Max. memory is 16.1 GB. * Boogie Procedure Inliner took 37.01 ms. Allocated memory is still 90.2 MB. Free memory was 68.2 MB in the beginning and 67.0 MB in the end (delta: 1.3 MB). There was no memory consumed. Max. memory is 16.1 GB. * Boogie Preprocessor took 40.94 ms. Allocated memory is still 90.2 MB. Free memory was 67.0 MB in the beginning and 65.8 MB in the end (delta: 1.2 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * RCFGBuilder took 469.20 ms. Allocated memory is still 90.2 MB. Free memory was 65.8 MB in the beginning and 50.7 MB in the end (delta: 15.1 MB). Peak memory consumption was 14.7 MB. Max. memory is 16.1 GB. * TraceAbstraction took 12984.46 ms. Allocated memory was 90.2 MB in the beginning and 281.0 MB in the end (delta: 190.8 MB). Free memory was 50.3 MB in the beginning and 251.1 MB in the end (delta: -200.8 MB). Peak memory consumption was 153.1 MB. Max. memory is 16.1 GB. * Witness Printer took 52.20 ms. Allocated memory is still 281.0 MB. Free memory was 251.1 MB in the beginning and 249.0 MB in the end (delta: 2.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 29]: 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: 28]: Loop Invariant Derived loop invariant: 1 - InvariantResult [Line: 21]: Loop Invariant Derived loop invariant: ((c == 6 && b < 7) && 6 <= b) && a < 7 - InvariantResult [Line: 22]: Loop Invariant Derived loop invariant: (a < 6 && c == 6) && b < 7 - InvariantResult [Line: 23]: Loop Invariant Derived loop invariant: (((((((a < 6 && c == 6) && b < 6) || ((a < 6 && b < 6) && c == 5)) || ((a < 6 && b < 6) && c == 1)) || ((c == 4 && a < 6) && b < 6)) || ((a < 6 && b < 6) && c == 0)) || ((a < 6 && c == 3) && b < 6)) || ((a < 6 && c == 2) && b < 6) - StatisticsResult: Ultimate Automizer benchmark data CFG has 1 procedures, 9 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 12.0s, OverallIterations: 8, TraceHistogramMax: 144, AutomataDifference: 2.5s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.8s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 53 SDtfs, 73 SDslu, 54 SDs, 0 SdLazy, 306 SolverSat, 280 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.5s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 811 GetRequests, 694 SyntacticMatches, 2 SemanticMatches, 115 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1754 ImplicationChecksByTransitivity, 2.3s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=205occurred in iteration=7, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.1s AutomataMinimizationTime, 8 MinimizatonAttempts, 23 StatesRemovedByMinimization, 3 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 4 LocationsWithAnnotation, 4 PreInvPairs, 306 NumberOfFragments, 95 HoareAnnotationTreeSize, 4 FomulaSimplifications, 6548 FormulaSimplificationTreeSizeReduction, 0.4s HoareSimplificationTime, 4 FomulaSimplificationsInter, 1096 FormulaSimplificationTreeSizeReductionInter, 0.4s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.1s SsaConstructionTime, 0.5s SatisfiabilityAnalysisTime, 2.1s InterpolantComputationTime, 740 NumberOfCodeBlocks, 633 NumberOfCodeBlocksAsserted, 64 NumberOfCheckSat, 1083 ConstructedInterpolants, 0 QuantifiedInterpolants, 341334 SizeOfPredicates, 4 NumberOfNonLiveVariables, 870 ConjunctsInSsa, 37 ConjunctsInUnsatCore, 18 InterpolantComputations, 3 PerfectInterpolantSequences, 39339/50712 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...