./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 a4ecdabc Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud-vcloud-master/worker/run_dir_f9ac966a-d2be-4796-8a2b-69d8a9af1e42/bin/utaipan/data/config -Xmx15G -Xms4m -jar /tmp/vcloud-vcloud-master/worker/run_dir_f9ac966a-d2be-4796-8a2b-69d8a9af1e42/bin/utaipan/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/run_dir_f9ac966a-d2be-4796-8a2b-69d8a9af1e42/bin/utaipan/data -tc /tmp/vcloud-vcloud-master/worker/run_dir_f9ac966a-d2be-4796-8a2b-69d8a9af1e42/bin/utaipan/config/TaipanReach.xml -i ../../sv-benchmarks/c/loop-simple/nested_3.c -s /tmp/vcloud-vcloud-master/worker/run_dir_f9ac966a-d2be-4796-8a2b-69d8a9af1e42/bin/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/run_dir_f9ac966a-d2be-4796-8a2b-69d8a9af1e42/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-a4ecdab [2020-11-28 07:36:07,186 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-11-28 07:36:07,188 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-11-28 07:36:07,258 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-11-28 07:36:07,259 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-11-28 07:36:07,260 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-11-28 07:36:07,262 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-11-28 07:36:07,264 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-11-28 07:36:07,267 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-11-28 07:36:07,275 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-11-28 07:36:07,276 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-11-28 07:36:07,278 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-11-28 07:36:07,278 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-11-28 07:36:07,279 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-11-28 07:36:07,281 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-11-28 07:36:07,282 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-11-28 07:36:07,283 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-11-28 07:36:07,284 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-11-28 07:36:07,289 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-11-28 07:36:07,303 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-11-28 07:36:07,309 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-11-28 07:36:07,311 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-11-28 07:36:07,313 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-11-28 07:36:07,314 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-11-28 07:36:07,317 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-11-28 07:36:07,318 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-11-28 07:36:07,318 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-11-28 07:36:07,319 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-11-28 07:36:07,320 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-11-28 07:36:07,321 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-11-28 07:36:07,322 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-11-28 07:36:07,325 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-11-28 07:36:07,328 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-11-28 07:36:07,329 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-11-28 07:36:07,330 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-11-28 07:36:07,331 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-11-28 07:36:07,332 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-11-28 07:36:07,332 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-11-28 07:36:07,332 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-11-28 07:36:07,334 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-11-28 07:36:07,335 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-11-28 07:36:07,337 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud-vcloud-master/worker/run_dir_f9ac966a-d2be-4796-8a2b-69d8a9af1e42/bin/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf [2020-11-28 07:36:07,387 INFO L113 SettingsManager]: Loading preferences was successful [2020-11-28 07:36:07,387 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-11-28 07:36:07,388 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2020-11-28 07:36:07,389 INFO L138 SettingsManager]: * User list type=DISABLED [2020-11-28 07:36:07,389 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2020-11-28 07:36:07,389 INFO L138 SettingsManager]: * Explicit value domain=true [2020-11-28 07:36:07,389 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2020-11-28 07:36:07,390 INFO L138 SettingsManager]: * Octagon Domain=false [2020-11-28 07:36:07,390 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2020-11-28 07:36:07,390 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2020-11-28 07:36:07,391 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2020-11-28 07:36:07,391 INFO L138 SettingsManager]: * Interval Domain=false [2020-11-28 07:36:07,392 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2020-11-28 07:36:07,392 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2020-11-28 07:36:07,392 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2020-11-28 07:36:07,393 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-11-28 07:36:07,393 INFO L138 SettingsManager]: * sizeof long=4 [2020-11-28 07:36:07,393 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-11-28 07:36:07,394 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-11-28 07:36:07,394 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-11-28 07:36:07,394 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-11-28 07:36:07,394 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-11-28 07:36:07,394 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-11-28 07:36:07,395 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2020-11-28 07:36:07,395 INFO L138 SettingsManager]: * sizeof long double=12 [2020-11-28 07:36:07,395 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-11-28 07:36:07,395 INFO L138 SettingsManager]: * Use constant arrays=true [2020-11-28 07:36:07,396 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-11-28 07:36:07,396 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-11-28 07:36:07,396 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-11-28 07:36:07,396 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-11-28 07:36:07,396 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-11-28 07:36:07,397 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-11-28 07:36:07,397 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-11-28 07:36:07,397 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-11-28 07:36:07,398 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2020-11-28 07:36:07,398 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-11-28 07:36:07,398 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-11-28 07:36:07,398 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-11-28 07:36:07,398 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2020-11-28 07:36:07,399 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_f9ac966a-d2be-4796-8a2b-69d8a9af1e42/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud-vcloud-master/worker/run_dir_f9ac966a-d2be-4796-8a2b-69d8a9af1e42/bin/utaipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> e63f4150318242871d0ac34a0d1b61fbf23907ae [2020-11-28 07:36:07,671 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-11-28 07:36:07,699 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-11-28 07:36:07,701 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-11-28 07:36:07,703 INFO L271 PluginConnector]: Initializing CDTParser... [2020-11-28 07:36:07,704 INFO L275 PluginConnector]: CDTParser initialized [2020-11-28 07:36:07,705 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/run_dir_f9ac966a-d2be-4796-8a2b-69d8a9af1e42/bin/utaipan/../../sv-benchmarks/c/loop-simple/nested_3.c [2020-11-28 07:36:07,767 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_f9ac966a-d2be-4796-8a2b-69d8a9af1e42/bin/utaipan/data/3d299ca3e/2f6679d93a26421890f7e15a701d7732/FLAGa8d1315e9 [2020-11-28 07:36:08,217 INFO L306 CDTParser]: Found 1 translation units. [2020-11-28 07:36:08,218 INFO L160 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/run_dir_f9ac966a-d2be-4796-8a2b-69d8a9af1e42/sv-benchmarks/c/loop-simple/nested_3.c [2020-11-28 07:36:08,224 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_f9ac966a-d2be-4796-8a2b-69d8a9af1e42/bin/utaipan/data/3d299ca3e/2f6679d93a26421890f7e15a701d7732/FLAGa8d1315e9 [2020-11-28 07:36:08,608 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/run_dir_f9ac966a-d2be-4796-8a2b-69d8a9af1e42/bin/utaipan/data/3d299ca3e/2f6679d93a26421890f7e15a701d7732 [2020-11-28 07:36:08,611 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-11-28 07:36:08,612 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2020-11-28 07:36:08,623 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-11-28 07:36:08,623 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-11-28 07:36:08,626 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-11-28 07:36:08,627 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 28.11 07:36:08" (1/1) ... [2020-11-28 07:36:08,629 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@d724828 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 07:36:08, skipping insertion in model container [2020-11-28 07:36:08,629 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 28.11 07:36:08" (1/1) ... [2020-11-28 07:36:08,636 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-11-28 07:36:08,650 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-11-28 07:36:08,824 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-11-28 07:36:08,832 INFO L203 MainTranslator]: Completed pre-run [2020-11-28 07:36:08,846 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-11-28 07:36:08,858 INFO L208 MainTranslator]: Completed translation [2020-11-28 07:36:08,859 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 07:36:08 WrapperNode [2020-11-28 07:36:08,859 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-11-28 07:36:08,860 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2020-11-28 07:36:08,860 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2020-11-28 07:36:08,860 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2020-11-28 07:36:08,868 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 07:36:08" (1/1) ... [2020-11-28 07:36:08,874 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 07:36:08" (1/1) ... [2020-11-28 07:36:08,889 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2020-11-28 07:36:08,890 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-11-28 07:36:08,890 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-11-28 07:36:08,890 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-11-28 07:36:08,898 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 07:36:08" (1/1) ... [2020-11-28 07:36:08,898 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 07:36:08" (1/1) ... [2020-11-28 07:36:08,899 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 07:36:08" (1/1) ... [2020-11-28 07:36:08,899 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 07:36:08" (1/1) ... [2020-11-28 07:36:08,902 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 07:36:08" (1/1) ... [2020-11-28 07:36:08,906 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 07:36:08" (1/1) ... [2020-11-28 07:36:08,907 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 07:36:08" (1/1) ... [2020-11-28 07:36:08,908 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-11-28 07:36:08,909 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-11-28 07:36:08,909 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-11-28 07:36:08,909 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-11-28 07:36:08,910 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 07:36:08" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_f9ac966a-d2be-4796-8a2b-69d8a9af1e42/bin/utaipan/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-11-28 07:36:08,987 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-11-28 07:36:08,987 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-11-28 07:36:08,988 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-11-28 07:36:08,988 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-11-28 07:36:09,374 INFO L293 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-11-28 07:36:09,374 INFO L298 CfgBuilder]: Removed 9 assume(true) statements. [2020-11-28 07:36:09,376 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 28.11 07:36:09 BoogieIcfgContainer [2020-11-28 07:36:09,376 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-11-28 07:36:09,377 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-11-28 07:36:09,378 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-11-28 07:36:09,385 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-11-28 07:36:09,386 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 28.11 07:36:08" (1/3) ... [2020-11-28 07:36:09,386 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@c7e37dd and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 28.11 07:36:09, skipping insertion in model container [2020-11-28 07:36:09,386 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 07:36:08" (2/3) ... [2020-11-28 07:36:09,387 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@c7e37dd and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 28.11 07:36:09, skipping insertion in model container [2020-11-28 07:36:09,387 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 28.11 07:36:09" (3/3) ... [2020-11-28 07:36:09,388 INFO L111 eAbstractionObserver]: Analyzing ICFG nested_3.c [2020-11-28 07:36:09,406 INFO L164 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-11-28 07:36:09,413 INFO L176 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-11-28 07:36:09,428 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-11-28 07:36:09,452 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-11-28 07:36:09,452 INFO L378 AbstractCegarLoop]: Hoare is true [2020-11-28 07:36:09,452 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-11-28 07:36:09,453 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-11-28 07:36:09,453 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-11-28 07:36:09,453 INFO L382 AbstractCegarLoop]: Difference is false [2020-11-28 07:36:09,453 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-11-28 07:36:09,453 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-11-28 07:36:09,465 INFO L276 IsEmpty]: Start isEmpty. Operand 9 states. [2020-11-28 07:36:09,469 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2020-11-28 07:36:09,470 INFO L414 BasicCegarLoop]: Found error trace [2020-11-28 07:36:09,470 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1] [2020-11-28 07:36:09,471 INFO L429 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-28 07:36:09,476 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 07:36:09,476 INFO L82 PathProgramCache]: Analyzing trace with hash 2588357, now seen corresponding path program 1 times [2020-11-28 07:36:09,485 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-28 07:36:09,485 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [763342417] [2020-11-28 07:36:09,486 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-28 07:36:09,565 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 07:36:09,657 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-28 07:36:09,658 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [763342417] [2020-11-28 07:36:09,658 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-28 07:36:09,659 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-11-28 07:36:09,659 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1814752945] [2020-11-28 07:36:09,663 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-11-28 07:36:09,664 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-28 07:36:09,676 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-11-28 07:36:09,677 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-11-28 07:36:09,679 INFO L87 Difference]: Start difference. First operand 9 states. Second operand 3 states. [2020-11-28 07:36:09,725 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-28 07:36:09,725 INFO L93 Difference]: Finished difference Result 17 states and 23 transitions. [2020-11-28 07:36:09,726 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-11-28 07:36:09,727 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 4 [2020-11-28 07:36:09,727 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-28 07:36:09,734 INFO L225 Difference]: With dead ends: 17 [2020-11-28 07:36:09,735 INFO L226 Difference]: Without dead ends: 10 [2020-11-28 07:36:09,737 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-11-28 07:36:09,753 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10 states. [2020-11-28 07:36:09,763 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10 to 8. [2020-11-28 07:36:09,764 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 8 states. [2020-11-28 07:36:09,765 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8 states to 8 states and 10 transitions. [2020-11-28 07:36:09,766 INFO L78 Accepts]: Start accepts. Automaton has 8 states and 10 transitions. Word has length 4 [2020-11-28 07:36:09,766 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-28 07:36:09,766 INFO L481 AbstractCegarLoop]: Abstraction has 8 states and 10 transitions. [2020-11-28 07:36:09,766 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-11-28 07:36:09,767 INFO L276 IsEmpty]: Start isEmpty. Operand 8 states and 10 transitions. [2020-11-28 07:36:09,767 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2020-11-28 07:36:09,767 INFO L414 BasicCegarLoop]: Found error trace [2020-11-28 07:36:09,767 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2020-11-28 07:36:09,767 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-11-28 07:36:09,768 INFO L429 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-28 07:36:09,768 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 07:36:09,769 INFO L82 PathProgramCache]: Analyzing trace with hash -1850440460, now seen corresponding path program 1 times [2020-11-28 07:36:09,769 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-28 07:36:09,769 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1780107998] [2020-11-28 07:36:09,769 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-28 07:36:09,791 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 07:36:09,839 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-28 07:36:09,839 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1780107998] [2020-11-28 07:36:09,839 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-28 07:36:09,840 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-11-28 07:36:09,840 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1202392765] [2020-11-28 07:36:09,841 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-11-28 07:36:09,841 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-28 07:36:09,842 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-11-28 07:36:09,842 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-11-28 07:36:09,843 INFO L87 Difference]: Start difference. First operand 8 states and 10 transitions. Second operand 3 states. [2020-11-28 07:36:09,867 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-28 07:36:09,867 INFO L93 Difference]: Finished difference Result 16 states and 22 transitions. [2020-11-28 07:36:09,868 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-11-28 07:36:09,868 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 6 [2020-11-28 07:36:09,868 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-28 07:36:09,869 INFO L225 Difference]: With dead ends: 16 [2020-11-28 07:36:09,869 INFO L226 Difference]: Without dead ends: 10 [2020-11-28 07:36:09,870 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 [2020-11-28 07:36:09,870 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10 states. [2020-11-28 07:36:09,872 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10 to 9. [2020-11-28 07:36:09,872 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 9 states. [2020-11-28 07:36:09,872 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9 states to 9 states and 11 transitions. [2020-11-28 07:36:09,873 INFO L78 Accepts]: Start accepts. Automaton has 9 states and 11 transitions. Word has length 6 [2020-11-28 07:36:09,873 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-28 07:36:09,873 INFO L481 AbstractCegarLoop]: Abstraction has 9 states and 11 transitions. [2020-11-28 07:36:09,873 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-11-28 07:36:09,873 INFO L276 IsEmpty]: Start isEmpty. Operand 9 states and 11 transitions. [2020-11-28 07:36:09,874 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2020-11-28 07:36:09,874 INFO L414 BasicCegarLoop]: Found error trace [2020-11-28 07:36:09,874 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2020-11-28 07:36:09,874 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-11-28 07:36:09,874 INFO L429 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-28 07:36:09,875 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 07:36:09,875 INFO L82 PathProgramCache]: Analyzing trace with hash -1326401377, now seen corresponding path program 1 times [2020-11-28 07:36:09,875 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-28 07:36:09,876 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2042044067] [2020-11-28 07:36:09,876 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-28 07:36:09,890 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 07:36:09,909 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-28 07:36:09,909 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2042044067] [2020-11-28 07:36:09,910 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-28 07:36:09,910 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-11-28 07:36:09,910 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1841705554] [2020-11-28 07:36:09,910 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-11-28 07:36:09,911 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-28 07:36:09,912 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-11-28 07:36:09,912 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-11-28 07:36:09,912 INFO L87 Difference]: Start difference. First operand 9 states and 11 transitions. Second operand 3 states. [2020-11-28 07:36:09,933 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-28 07:36:09,933 INFO L93 Difference]: Finished difference Result 17 states and 22 transitions. [2020-11-28 07:36:09,934 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-11-28 07:36:09,935 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 8 [2020-11-28 07:36:09,935 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-28 07:36:09,935 INFO L225 Difference]: With dead ends: 17 [2020-11-28 07:36:09,935 INFO L226 Difference]: Without dead ends: 10 [2020-11-28 07:36:09,936 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 [2020-11-28 07:36:09,936 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10 states. [2020-11-28 07:36:09,938 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10 to 10. [2020-11-28 07:36:09,938 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 10 states. [2020-11-28 07:36:09,939 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10 states to 10 states and 12 transitions. [2020-11-28 07:36:09,939 INFO L78 Accepts]: Start accepts. Automaton has 10 states and 12 transitions. Word has length 8 [2020-11-28 07:36:09,939 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-28 07:36:09,939 INFO L481 AbstractCegarLoop]: Abstraction has 10 states and 12 transitions. [2020-11-28 07:36:09,939 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-11-28 07:36:09,939 INFO L276 IsEmpty]: Start isEmpty. Operand 10 states and 12 transitions. [2020-11-28 07:36:09,940 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2020-11-28 07:36:09,940 INFO L414 BasicCegarLoop]: Found error trace [2020-11-28 07:36:09,940 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-28 07:36:09,940 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-11-28 07:36:09,940 INFO L429 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-28 07:36:09,941 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 07:36:09,941 INFO L82 PathProgramCache]: Analyzing trace with hash 1661376418, now seen corresponding path program 1 times [2020-11-28 07:36:09,941 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-28 07:36:09,942 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1816937615] [2020-11-28 07:36:09,942 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-28 07:36:09,954 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 07:36:10,033 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-28 07:36:10,034 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1816937615] [2020-11-28 07:36:10,034 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1755139014] [2020-11-28 07:36:10,034 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_f9ac966a-d2be-4796-8a2b-69d8a9af1e42/bin/utaipan/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-28 07:36:10,088 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 07:36:10,090 INFO L263 TraceCheckSpWp]: Trace formula consists of 55 conjuncts, 3 conjunts are in the unsatisfiable core [2020-11-28 07:36:10,094 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-28 07:36:10,150 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-28 07:36:10,150 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-11-28 07:36:10,196 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-28 07:36:10,196 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [213713664] [2020-11-28 07:36:10,226 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2020-11-28 07:36:10,226 INFO L166 IcfgInterpreter]: Building call graph [2020-11-28 07:36:10,233 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-11-28 07:36:10,238 INFO L176 IcfgInterpreter]: Starting interpretation [2020-11-28 07:36:10,239 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-11-28 07:36:11,624 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:142) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.iterateNew(TraceAbstractionStarter.java:341) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:182) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:134) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2020-11-28 07:36:11,625 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-11-28 07:36:11,625 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 7 [2020-11-28 07:36:11,626 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [694885882] [2020-11-28 07:36:11,626 INFO L461 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-11-28 07:36:11,626 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-28 07:36:11,627 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-11-28 07:36:11,627 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2020-11-28 07:36:11,627 INFO L87 Difference]: Start difference. First operand 10 states and 12 transitions. Second operand 7 states. [2020-11-28 07:36:11,663 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-28 07:36:11,663 INFO L93 Difference]: Finished difference Result 21 states and 28 transitions. [2020-11-28 07:36:11,664 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-11-28 07:36:11,664 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 9 [2020-11-28 07:36:11,665 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-28 07:36:11,665 INFO L225 Difference]: With dead ends: 21 [2020-11-28 07:36:11,665 INFO L226 Difference]: Without dead ends: 13 [2020-11-28 07:36:11,666 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 [2020-11-28 07:36:11,666 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2020-11-28 07:36:11,668 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2020-11-28 07:36:11,668 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2020-11-28 07:36:11,668 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 15 transitions. [2020-11-28 07:36:11,669 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 15 transitions. Word has length 9 [2020-11-28 07:36:11,669 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-28 07:36:11,669 INFO L481 AbstractCegarLoop]: Abstraction has 13 states and 15 transitions. [2020-11-28 07:36:11,669 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-11-28 07:36:11,669 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 15 transitions. [2020-11-28 07:36:11,670 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-11-28 07:36:11,670 INFO L414 BasicCegarLoop]: Found error trace [2020-11-28 07:36:11,670 INFO L422 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-28 07:36:11,870 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable3 [2020-11-28 07:36:11,871 INFO L429 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-28 07:36:11,871 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 07:36:11,871 INFO L82 PathProgramCache]: Analyzing trace with hash 1995563359, now seen corresponding path program 2 times [2020-11-28 07:36:11,871 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-28 07:36:11,872 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1226688774] [2020-11-28 07:36:11,872 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-28 07:36:11,885 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 07:36:11,916 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2020-11-28 07:36:11,916 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1226688774] [2020-11-28 07:36:11,916 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [464445485] [2020-11-28 07:36:11,917 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_f9ac966a-d2be-4796-8a2b-69d8a9af1e42/bin/utaipan/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-28 07:36:11,969 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2020-11-28 07:36:11,969 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-11-28 07:36:11,970 INFO L263 TraceCheckSpWp]: Trace formula consists of 46 conjuncts, 3 conjunts are in the unsatisfiable core [2020-11-28 07:36:11,971 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-28 07:36:12,000 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2020-11-28 07:36:12,000 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-11-28 07:36:12,032 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2020-11-28 07:36:12,032 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1994741360] [2020-11-28 07:36:12,034 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2020-11-28 07:36:12,034 INFO L166 IcfgInterpreter]: Building call graph [2020-11-28 07:36:12,035 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-11-28 07:36:12,035 INFO L176 IcfgInterpreter]: Starting interpretation [2020-11-28 07:36:12,035 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-11-28 07:36:12,964 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:142) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.iterateNew(TraceAbstractionStarter.java:341) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:182) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:134) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2020-11-28 07:36:12,967 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-11-28 07:36:12,967 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 3, 3] total 8 [2020-11-28 07:36:12,967 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [375907269] [2020-11-28 07:36:12,968 INFO L461 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-11-28 07:36:12,968 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-28 07:36:12,968 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-11-28 07:36:12,969 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=36, Unknown=0, NotChecked=0, Total=56 [2020-11-28 07:36:12,969 INFO L87 Difference]: Start difference. First operand 13 states and 15 transitions. Second operand 8 states. [2020-11-28 07:36:13,208 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-28 07:36:13,208 INFO L93 Difference]: Finished difference Result 92 states and 117 transitions. [2020-11-28 07:36:13,209 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-11-28 07:36:13,209 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 12 [2020-11-28 07:36:13,209 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-28 07:36:13,210 INFO L225 Difference]: With dead ends: 92 [2020-11-28 07:36:13,210 INFO L226 Difference]: Without dead ends: 81 [2020-11-28 07:36:13,211 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 [2020-11-28 07:36:13,212 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2020-11-28 07:36:13,220 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 61. [2020-11-28 07:36:13,220 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-11-28 07:36:13,221 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 73 transitions. [2020-11-28 07:36:13,223 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 73 transitions. Word has length 12 [2020-11-28 07:36:13,223 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-28 07:36:13,223 INFO L481 AbstractCegarLoop]: Abstraction has 61 states and 73 transitions. [2020-11-28 07:36:13,224 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-11-28 07:36:13,224 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 73 transitions. [2020-11-28 07:36:13,226 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2020-11-28 07:36:13,227 INFO L414 BasicCegarLoop]: Found error trace [2020-11-28 07:36:13,227 INFO L422 BasicCegarLoop]: trace histogram [32, 8, 8, 4, 4, 1, 1, 1, 1] [2020-11-28 07:36:13,429 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable77 [2020-11-28 07:36:13,430 INFO L429 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-28 07:36:13,430 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 07:36:13,430 INFO L82 PathProgramCache]: Analyzing trace with hash 583425369, now seen corresponding path program 3 times [2020-11-28 07:36:13,430 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-28 07:36:13,430 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1273941042] [2020-11-28 07:36:13,431 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-28 07:36:13,479 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 07:36:13,579 INFO L134 CoverageAnalysis]: Checked inductivity of 856 backedges. 190 proven. 10 refuted. 0 times theorem prover too weak. 656 trivial. 0 not checked. [2020-11-28 07:36:13,581 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1273941042] [2020-11-28 07:36:13,581 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [774373138] [2020-11-28 07:36:13,582 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_f9ac966a-d2be-4796-8a2b-69d8a9af1e42/bin/utaipan/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-28 07:36:13,680 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-11-28 07:36:13,681 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-11-28 07:36:13,682 INFO L263 TraceCheckSpWp]: Trace formula consists of 173 conjuncts, 6 conjunts are in the unsatisfiable core [2020-11-28 07:36:13,687 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-28 07:36:13,717 INFO L134 CoverageAnalysis]: Checked inductivity of 856 backedges. 190 proven. 10 refuted. 0 times theorem prover too weak. 656 trivial. 0 not checked. [2020-11-28 07:36:13,717 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-11-28 07:36:13,776 INFO L134 CoverageAnalysis]: Checked inductivity of 856 backedges. 190 proven. 10 refuted. 0 times theorem prover too weak. 656 trivial. 0 not checked. [2020-11-28 07:36:13,777 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1523355860] [2020-11-28 07:36:13,780 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2020-11-28 07:36:13,781 INFO L166 IcfgInterpreter]: Building call graph [2020-11-28 07:36:13,782 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-11-28 07:36:13,782 INFO L176 IcfgInterpreter]: Starting interpretation [2020-11-28 07:36:13,783 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-11-28 07:36:14,430 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:142) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.iterateNew(TraceAbstractionStarter.java:341) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:182) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:134) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2020-11-28 07:36:14,430 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-11-28 07:36:14,430 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 9 [2020-11-28 07:36:14,431 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1662860716] [2020-11-28 07:36:14,431 INFO L461 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-11-28 07:36:14,431 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-28 07:36:14,432 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-11-28 07:36:14,432 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2020-11-28 07:36:14,432 INFO L87 Difference]: Start difference. First operand 61 states and 73 transitions. Second operand 9 states. [2020-11-28 07:36:14,476 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-28 07:36:14,476 INFO L93 Difference]: Finished difference Result 130 states and 169 transitions. [2020-11-28 07:36:14,477 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-11-28 07:36:14,477 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 60 [2020-11-28 07:36:14,477 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-28 07:36:14,478 INFO L225 Difference]: With dead ends: 130 [2020-11-28 07:36:14,478 INFO L226 Difference]: Without dead ends: 77 [2020-11-28 07:36:14,479 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 [2020-11-28 07:36:14,479 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2020-11-28 07:36:14,489 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 77. [2020-11-28 07:36:14,489 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 77 states. [2020-11-28 07:36:14,490 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 89 transitions. [2020-11-28 07:36:14,491 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 89 transitions. Word has length 60 [2020-11-28 07:36:14,491 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-28 07:36:14,491 INFO L481 AbstractCegarLoop]: Abstraction has 77 states and 89 transitions. [2020-11-28 07:36:14,491 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-11-28 07:36:14,491 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 89 transitions. [2020-11-28 07:36:14,493 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2020-11-28 07:36:14,493 INFO L414 BasicCegarLoop]: Found error trace [2020-11-28 07:36:14,494 INFO L422 BasicCegarLoop]: trace histogram [48, 8, 8, 4, 4, 1, 1, 1, 1] [2020-11-28 07:36:14,694 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable151,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-28 07:36:14,694 INFO L429 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-28 07:36:14,695 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 07:36:14,695 INFO L82 PathProgramCache]: Analyzing trace with hash -1964071335, now seen corresponding path program 4 times [2020-11-28 07:36:14,695 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-28 07:36:14,695 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [810071292] [2020-11-28 07:36:14,695 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-28 07:36:14,733 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 07:36:14,813 INFO L134 CoverageAnalysis]: Checked inductivity of 1616 backedges. 619 proven. 52 refuted. 0 times theorem prover too weak. 945 trivial. 0 not checked. [2020-11-28 07:36:14,817 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [810071292] [2020-11-28 07:36:14,818 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2096894711] [2020-11-28 07:36:14,818 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_f9ac966a-d2be-4796-8a2b-69d8a9af1e42/bin/utaipan/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-28 07:36:14,928 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 07:36:14,931 INFO L263 TraceCheckSpWp]: Trace formula consists of 256 conjuncts, 4 conjunts are in the unsatisfiable core [2020-11-28 07:36:14,936 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-28 07:36:14,964 INFO L134 CoverageAnalysis]: Checked inductivity of 1616 backedges. 619 proven. 52 refuted. 0 times theorem prover too weak. 945 trivial. 0 not checked. [2020-11-28 07:36:14,965 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-11-28 07:36:15,036 INFO L134 CoverageAnalysis]: Checked inductivity of 1616 backedges. 619 proven. 52 refuted. 0 times theorem prover too weak. 945 trivial. 0 not checked. [2020-11-28 07:36:15,037 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1231552753] [2020-11-28 07:36:15,039 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2020-11-28 07:36:15,039 INFO L166 IcfgInterpreter]: Building call graph [2020-11-28 07:36:15,040 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-11-28 07:36:15,040 INFO L176 IcfgInterpreter]: Starting interpretation [2020-11-28 07:36:15,041 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-11-28 07:36:15,593 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:142) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.iterateNew(TraceAbstractionStarter.java:341) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:182) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:134) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2020-11-28 07:36:15,593 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-11-28 07:36:15,593 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 9 [2020-11-28 07:36:15,594 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1661660970] [2020-11-28 07:36:15,594 INFO L461 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-11-28 07:36:15,594 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-28 07:36:15,595 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-11-28 07:36:15,595 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2020-11-28 07:36:15,595 INFO L87 Difference]: Start difference. First operand 77 states and 89 transitions. Second operand 9 states. [2020-11-28 07:36:15,662 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-28 07:36:15,662 INFO L93 Difference]: Finished difference Result 263 states and 316 transitions. [2020-11-28 07:36:15,662 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-11-28 07:36:15,662 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 76 [2020-11-28 07:36:15,663 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-28 07:36:15,664 INFO L225 Difference]: With dead ends: 263 [2020-11-28 07:36:15,664 INFO L226 Difference]: Without dead ends: 205 [2020-11-28 07:36:15,665 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 [2020-11-28 07:36:15,666 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 205 states. [2020-11-28 07:36:15,690 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 205 to 205. [2020-11-28 07:36:15,690 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 205 states. [2020-11-28 07:36:15,693 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 205 states to 205 states and 233 transitions. [2020-11-28 07:36:15,693 INFO L78 Accepts]: Start accepts. Automaton has 205 states and 233 transitions. Word has length 76 [2020-11-28 07:36:15,701 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-28 07:36:15,701 INFO L481 AbstractCegarLoop]: Abstraction has 205 states and 233 transitions. [2020-11-28 07:36:15,701 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-11-28 07:36:15,702 INFO L276 IsEmpty]: Start isEmpty. Operand 205 states and 233 transitions. [2020-11-28 07:36:15,705 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 205 [2020-11-28 07:36:15,705 INFO L414 BasicCegarLoop]: Found error trace [2020-11-28 07:36:15,705 INFO L422 BasicCegarLoop]: trace histogram [144, 24, 24, 4, 4, 1, 1, 1, 1] [2020-11-28 07:36:15,931 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable225,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-28 07:36:15,931 INFO L429 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-28 07:36:15,931 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 07:36:15,932 INFO L82 PathProgramCache]: Analyzing trace with hash 642564361, now seen corresponding path program 5 times [2020-11-28 07:36:15,932 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-28 07:36:15,932 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2133798303] [2020-11-28 07:36:15,932 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-28 07:36:16,079 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 07:36:16,305 INFO L134 CoverageAnalysis]: Checked inductivity of 14416 backedges. 0 proven. 10888 refuted. 0 times theorem prover too weak. 3528 trivial. 0 not checked. [2020-11-28 07:36:16,306 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2133798303] [2020-11-28 07:36:16,306 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1107424577] [2020-11-28 07:36:16,306 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_f9ac966a-d2be-4796-8a2b-69d8a9af1e42/bin/utaipan/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-28 07:36:16,538 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 51 check-sat command(s) [2020-11-28 07:36:16,538 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-11-28 07:36:16,540 INFO L263 TraceCheckSpWp]: Trace formula consists of 340 conjuncts, 10 conjunts are in the unsatisfiable core [2020-11-28 07:36:16,547 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-28 07:36:16,792 INFO L134 CoverageAnalysis]: Checked inductivity of 14416 backedges. 5700 proven. 0 refuted. 0 times theorem prover too weak. 8716 trivial. 0 not checked. [2020-11-28 07:36:16,793 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-11-28 07:36:17,133 INFO L134 CoverageAnalysis]: Checked inductivity of 14416 backedges. 5443 proven. 257 refuted. 0 times theorem prover too weak. 8716 trivial. 0 not checked. [2020-11-28 07:36:17,134 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 2 imperfect interpolant sequences. [2020-11-28 07:36:17,134 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [6, 8] total 17 [2020-11-28 07:36:17,134 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1930944705] [2020-11-28 07:36:17,135 INFO L461 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-11-28 07:36:17,135 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-28 07:36:17,135 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-11-28 07:36:17,136 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=188, Unknown=0, NotChecked=0, Total=272 [2020-11-28 07:36:17,136 INFO L87 Difference]: Start difference. First operand 205 states and 233 transitions. Second operand 8 states. [2020-11-28 07:36:17,260 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-28 07:36:17,260 INFO L93 Difference]: Finished difference Result 205 states and 233 transitions. [2020-11-28 07:36:17,262 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-11-28 07:36:17,262 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 204 [2020-11-28 07:36:17,263 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-28 07:36:17,263 INFO L225 Difference]: With dead ends: 205 [2020-11-28 07:36:17,264 INFO L226 Difference]: Without dead ends: 0 [2020-11-28 07:36:17,265 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 414 GetRequests, 396 SyntacticMatches, 1 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=101, Invalid=241, Unknown=0, NotChecked=0, Total=342 [2020-11-28 07:36:17,265 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-11-28 07:36:17,265 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-11-28 07:36:17,265 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-11-28 07:36:17,265 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-11-28 07:36:17,266 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 204 [2020-11-28 07:36:17,266 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-28 07:36:17,266 INFO L481 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-11-28 07:36:17,266 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-11-28 07:36:17,266 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-11-28 07:36:17,266 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-11-28 07:36:17,466 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable299 [2020-11-28 07:36:17,468 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-11-28 07:36:17,648 INFO L274 CegarLoopResult]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2020-11-28 07:36:17,648 INFO L270 CegarLoopResult]: At program point L23-3(lines 23 25) the Hoare annotation is: (and (< ULTIMATE.start_main_~c~0 7) (< ULTIMATE.start_main_~a~0 6) (< ULTIMATE.start_main_~b~0 6)) [2020-11-28 07:36:17,649 INFO L270 CegarLoopResult]: At program point L21-3(lines 21 27) the Hoare annotation is: (and (< ULTIMATE.start_main_~c~0 7) (< ULTIMATE.start_main_~b~0 7) (<= 6 ULTIMATE.start_main_~b~0) (<= 6 ULTIMATE.start_main_~c~0) (< ULTIMATE.start_main_~a~0 7)) [2020-11-28 07:36:17,649 INFO L274 CegarLoopResult]: For program point L21-4(lines 15 32) no Hoare annotation was computed. [2020-11-28 07:36:17,649 INFO L274 CegarLoopResult]: For program point L13(line 13) no Hoare annotation was computed. [2020-11-28 07:36:17,649 INFO L274 CegarLoopResult]: For program point ULTIMATE.startENTRY(line -1) no Hoare annotation was computed. [2020-11-28 07:36:17,649 INFO L277 CegarLoopResult]: At program point L28(lines 28 30) the Hoare annotation is: true [2020-11-28 07:36:17,649 INFO L274 CegarLoopResult]: For program point ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION(line 13) no Hoare annotation was computed. [2020-11-28 07:36:17,649 INFO L270 CegarLoopResult]: At program point L22-3(lines 22 26) the Hoare annotation is: (and (< ULTIMATE.start_main_~c~0 7) (< ULTIMATE.start_main_~a~0 6) (< ULTIMATE.start_main_~b~0 7) (<= 6 ULTIMATE.start_main_~c~0)) [2020-11-28 07:36:17,670 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 28.11 07:36:17 BoogieIcfgContainer [2020-11-28 07:36:17,670 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-11-28 07:36:17,671 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2020-11-28 07:36:17,671 INFO L271 PluginConnector]: Initializing Witness Printer... [2020-11-28 07:36:17,671 INFO L275 PluginConnector]: Witness Printer initialized [2020-11-28 07:36:17,672 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 28.11 07:36:09" (3/4) ... [2020-11-28 07:36:17,674 INFO L137 WitnessPrinter]: Generating witness for correct program [2020-11-28 07:36:17,684 INFO L902 BoogieBacktranslator]: Reduced CFG by removing 11 nodes and edges [2020-11-28 07:36:17,684 INFO L902 BoogieBacktranslator]: Reduced CFG by removing 7 nodes and edges [2020-11-28 07:36:17,684 INFO L902 BoogieBacktranslator]: Reduced CFG by removing 2 nodes and edges [2020-11-28 07:36:17,684 INFO L902 BoogieBacktranslator]: Reduced CFG by removing 1 nodes and edges [2020-11-28 07:36:17,733 INFO L141 WitnessManager]: Wrote witness to /tmp/vcloud-vcloud-master/worker/run_dir_f9ac966a-d2be-4796-8a2b-69d8a9af1e42/bin/utaipan/witness.graphml [2020-11-28 07:36:17,733 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2020-11-28 07:36:17,734 INFO L168 Benchmark]: Toolchain (without parser) took 9121.68 ms. Allocated memory was 94.4 MB in the beginning and 197.1 MB in the end (delta: 102.8 MB). Free memory was 67.3 MB in the beginning and 162.8 MB in the end (delta: -95.6 MB). Peak memory consumption was 7.6 MB. Max. memory is 16.1 GB. [2020-11-28 07:36:17,735 INFO L168 Benchmark]: CDTParser took 0.25 ms. Allocated memory is still 94.4 MB. Free memory was 52.0 MB in the beginning and 51.9 MB in the end (delta: 71.5 kB). There was no memory consumed. Max. memory is 16.1 GB. [2020-11-28 07:36:17,735 INFO L168 Benchmark]: CACSL2BoogieTranslator took 236.27 ms. Allocated memory is still 94.4 MB. Free memory was 67.0 MB in the beginning and 73.2 MB in the end (delta: -6.2 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. [2020-11-28 07:36:17,738 INFO L168 Benchmark]: Boogie Procedure Inliner took 29.24 ms. Allocated memory is still 94.4 MB. Free memory was 73.2 MB in the beginning and 71.8 MB in the end (delta: 1.4 MB). There was no memory consumed. Max. memory is 16.1 GB. [2020-11-28 07:36:17,738 INFO L168 Benchmark]: Boogie Preprocessor took 18.24 ms. Allocated memory is still 94.4 MB. Free memory was 71.8 MB in the beginning and 70.7 MB in the end (delta: 1.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2020-11-28 07:36:17,739 INFO L168 Benchmark]: RCFGBuilder took 467.05 ms. Allocated memory is still 94.4 MB. Free memory was 70.7 MB in the beginning and 56.0 MB in the end (delta: 14.7 MB). Peak memory consumption was 14.7 MB. Max. memory is 16.1 GB. [2020-11-28 07:36:17,739 INFO L168 Benchmark]: TraceAbstraction took 8292.86 ms. Allocated memory was 94.4 MB in the beginning and 197.1 MB in the end (delta: 102.8 MB). Free memory was 55.6 MB in the beginning and 164.9 MB in the end (delta: -109.3 MB). Peak memory consumption was 100.8 MB. Max. memory is 16.1 GB. [2020-11-28 07:36:17,740 INFO L168 Benchmark]: Witness Printer took 62.46 ms. Allocated memory is still 197.1 MB. Free memory was 164.9 MB in the beginning and 162.8 MB in the end (delta: 2.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2020-11-28 07:36:17,744 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.25 ms. Allocated memory is still 94.4 MB. Free memory was 52.0 MB in the beginning and 51.9 MB in the end (delta: 71.5 kB). There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 236.27 ms. Allocated memory is still 94.4 MB. Free memory was 67.0 MB in the beginning and 73.2 MB in the end (delta: -6.2 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. * Boogie Procedure Inliner took 29.24 ms. Allocated memory is still 94.4 MB. Free memory was 73.2 MB in the beginning and 71.8 MB in the end (delta: 1.4 MB). There was no memory consumed. Max. memory is 16.1 GB. * Boogie Preprocessor took 18.24 ms. Allocated memory is still 94.4 MB. Free memory was 71.8 MB in the beginning and 70.7 MB in the end (delta: 1.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * RCFGBuilder took 467.05 ms. Allocated memory is still 94.4 MB. Free memory was 70.7 MB in the beginning and 56.0 MB in the end (delta: 14.7 MB). Peak memory consumption was 14.7 MB. Max. memory is 16.1 GB. * TraceAbstraction took 8292.86 ms. Allocated memory was 94.4 MB in the beginning and 197.1 MB in the end (delta: 102.8 MB). Free memory was 55.6 MB in the beginning and 164.9 MB in the end (delta: -109.3 MB). Peak memory consumption was 100.8 MB. Max. memory is 16.1 GB. * Witness Printer took 62.46 ms. Allocated memory is still 197.1 MB. Free memory was 164.9 MB in the beginning and 162.8 MB in the end (delta: 2.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 13]: call of __VERIFIER_error() unreachable For all program executions holds that call of __VERIFIER_error() unreachable at this location - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - InvariantResult [Line: 28]: Loop Invariant Derived loop invariant: 1 - InvariantResult [Line: 21]: Loop Invariant Derived loop invariant: (((c < 7 && b < 7) && 6 <= b) && 6 <= c) && a < 7 - InvariantResult [Line: 22]: Loop Invariant Derived loop invariant: ((c < 7 && a < 6) && b < 7) && 6 <= c - InvariantResult [Line: 23]: Loop Invariant Derived loop invariant: (c < 7 && a < 6) && b < 6 - StatisticsResult: Ultimate Automizer benchmark data CFG has 1 procedures, 9 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 8.0s, OverallIterations: 8, TraceHistogramMax: 144, AutomataDifference: 0.6s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.1s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 53 SDtfs, 73 SDslu, 54 SDs, 0 SdLazy, 118 SolverSat, 38 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.2s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 756 GetRequests, 701 SyntacticMatches, 2 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 125 ImplicationChecksByTransitivity, 1.0s 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: 0.0s AutomataMinimizationTime, 8 MinimizatonAttempts, 23 StatesRemovedByMinimization, 3 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 4 LocationsWithAnnotation, 4 PreInvPairs, 206 NumberOfFragments, 40 HoareAnnotationTreeSize, 4 FomulaSimplifications, 5237 FormulaSimplificationTreeSizeReduction, 0.0s HoareSimplificationTime, 4 FomulaSimplificationsInter, 40 FormulaSimplificationTreeSizeReductionInter, 0.0s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.1s SsaConstructionTime, 0.5s SatisfiabilityAnalysisTime, 1.5s InterpolantComputationTime, 740 NumberOfCodeBlocks, 633 NumberOfCodeBlocksAsserted, 64 NumberOfCheckSat, 1083 ConstructedInterpolants, 0 QuantifiedInterpolants, 330778 SizeOfPredicates, 9 NumberOfNonLiveVariables, 870 ConjunctsInSsa, 26 ConjunctsInUnsatCore, 18 InterpolantComputations, 4 PerfectInterpolantSequences, 39375/50712 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...