./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/loop-invgen/nested9.i --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_2814a227-5f59-41ed-9fe8-50d7c345f1bd/bin/utaipan/data/config -Xmx15G -Xms4m -jar /tmp/vcloud-vcloud-master/worker/run_dir_2814a227-5f59-41ed-9fe8-50d7c345f1bd/bin/utaipan/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/run_dir_2814a227-5f59-41ed-9fe8-50d7c345f1bd/bin/utaipan/data -tc /tmp/vcloud-vcloud-master/worker/run_dir_2814a227-5f59-41ed-9fe8-50d7c345f1bd/bin/utaipan/config/TaipanReach.xml -i ../../sv-benchmarks/c/loop-invgen/nested9.i -s /tmp/vcloud-vcloud-master/worker/run_dir_2814a227-5f59-41ed-9fe8-50d7c345f1bd/bin/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/run_dir_2814a227-5f59-41ed-9fe8-50d7c345f1bd/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 b0874b2316aff3266709463f0d72702527bf3a82 .......................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... 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 07:41:44,960 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-11-28 07:41:44,962 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-11-28 07:41:45,033 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-11-28 07:41:45,034 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-11-28 07:41:45,038 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-11-28 07:41:45,040 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-11-28 07:41:45,044 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-11-28 07:41:45,047 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-11-28 07:41:45,052 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-11-28 07:41:45,054 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-11-28 07:41:45,056 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-11-28 07:41:45,056 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-11-28 07:41:45,060 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-11-28 07:41:45,061 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-11-28 07:41:45,063 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-11-28 07:41:45,065 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-11-28 07:41:45,069 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-11-28 07:41:45,072 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-11-28 07:41:45,079 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-11-28 07:41:45,081 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-11-28 07:41:45,082 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-11-28 07:41:45,084 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-11-28 07:41:45,085 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-11-28 07:41:45,094 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-11-28 07:41:45,094 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-11-28 07:41:45,095 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-11-28 07:41:45,097 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-11-28 07:41:45,097 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-11-28 07:41:45,099 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-11-28 07:41:45,099 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-11-28 07:41:45,100 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-11-28 07:41:45,102 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-11-28 07:41:45,104 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-11-28 07:41:45,105 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-11-28 07:41:45,106 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-11-28 07:41:45,107 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-11-28 07:41:45,107 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-11-28 07:41:45,107 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-11-28 07:41:45,108 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-11-28 07:41:45,109 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-11-28 07:41:45,110 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud-vcloud-master/worker/run_dir_2814a227-5f59-41ed-9fe8-50d7c345f1bd/bin/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf [2020-11-28 07:41:45,155 INFO L113 SettingsManager]: Loading preferences was successful [2020-11-28 07:41:45,156 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-11-28 07:41:45,157 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2020-11-28 07:41:45,158 INFO L138 SettingsManager]: * User list type=DISABLED [2020-11-28 07:41:45,158 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2020-11-28 07:41:45,158 INFO L138 SettingsManager]: * Explicit value domain=true [2020-11-28 07:41:45,158 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2020-11-28 07:41:45,158 INFO L138 SettingsManager]: * Octagon Domain=false [2020-11-28 07:41:45,158 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2020-11-28 07:41:45,159 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2020-11-28 07:41:45,160 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2020-11-28 07:41:45,160 INFO L138 SettingsManager]: * Interval Domain=false [2020-11-28 07:41:45,160 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2020-11-28 07:41:45,160 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2020-11-28 07:41:45,161 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2020-11-28 07:41:45,161 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-11-28 07:41:45,162 INFO L138 SettingsManager]: * sizeof long=4 [2020-11-28 07:41:45,162 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-11-28 07:41:45,162 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-11-28 07:41:45,162 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-11-28 07:41:45,162 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-11-28 07:41:45,162 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-11-28 07:41:45,163 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-11-28 07:41:45,163 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2020-11-28 07:41:45,163 INFO L138 SettingsManager]: * sizeof long double=12 [2020-11-28 07:41:45,163 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-11-28 07:41:45,163 INFO L138 SettingsManager]: * Use constant arrays=true [2020-11-28 07:41:45,164 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-11-28 07:41:45,164 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-11-28 07:41:45,164 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-11-28 07:41:45,164 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-11-28 07:41:45,164 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-11-28 07:41:45,165 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-11-28 07:41:45,165 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-11-28 07:41:45,165 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-11-28 07:41:45,165 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2020-11-28 07:41:45,165 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-11-28 07:41:45,166 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-11-28 07:41:45,166 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-11-28 07:41:45,166 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2020-11-28 07:41:45,166 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_2814a227-5f59-41ed-9fe8-50d7c345f1bd/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud-vcloud-master/worker/run_dir_2814a227-5f59-41ed-9fe8-50d7c345f1bd/bin/utaipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> b0874b2316aff3266709463f0d72702527bf3a82 [2020-11-28 07:41:45,419 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-11-28 07:41:45,448 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-11-28 07:41:45,452 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-11-28 07:41:45,454 INFO L271 PluginConnector]: Initializing CDTParser... [2020-11-28 07:41:45,455 INFO L275 PluginConnector]: CDTParser initialized [2020-11-28 07:41:45,456 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/run_dir_2814a227-5f59-41ed-9fe8-50d7c345f1bd/bin/utaipan/../../sv-benchmarks/c/loop-invgen/nested9.i [2020-11-28 07:41:45,526 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_2814a227-5f59-41ed-9fe8-50d7c345f1bd/bin/utaipan/data/337fcb924/33c5da62a87e443fbe7dcfedb5fd39d8/FLAGfa819631a [2020-11-28 07:41:45,931 INFO L306 CDTParser]: Found 1 translation units. [2020-11-28 07:41:45,931 INFO L160 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/run_dir_2814a227-5f59-41ed-9fe8-50d7c345f1bd/sv-benchmarks/c/loop-invgen/nested9.i [2020-11-28 07:41:45,937 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_2814a227-5f59-41ed-9fe8-50d7c345f1bd/bin/utaipan/data/337fcb924/33c5da62a87e443fbe7dcfedb5fd39d8/FLAGfa819631a [2020-11-28 07:41:46,332 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/run_dir_2814a227-5f59-41ed-9fe8-50d7c345f1bd/bin/utaipan/data/337fcb924/33c5da62a87e443fbe7dcfedb5fd39d8 [2020-11-28 07:41:46,334 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-11-28 07:41:46,336 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2020-11-28 07:41:46,338 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-11-28 07:41:46,338 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-11-28 07:41:46,349 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-11-28 07:41:46,350 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 28.11 07:41:46" (1/1) ... [2020-11-28 07:41:46,353 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@55b86dde and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 07:41:46, skipping insertion in model container [2020-11-28 07:41:46,353 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 28.11 07:41:46" (1/1) ... [2020-11-28 07:41:46,361 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-11-28 07:41:46,379 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-11-28 07:41:46,562 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-11-28 07:41:46,570 INFO L203 MainTranslator]: Completed pre-run [2020-11-28 07:41:46,588 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-11-28 07:41:46,603 INFO L208 MainTranslator]: Completed translation [2020-11-28 07:41:46,603 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 07:41:46 WrapperNode [2020-11-28 07:41:46,603 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-11-28 07:41:46,605 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2020-11-28 07:41:46,605 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2020-11-28 07:41:46,605 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2020-11-28 07:41:46,612 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 07:41:46" (1/1) ... [2020-11-28 07:41:46,619 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 07:41:46" (1/1) ... [2020-11-28 07:41:46,636 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2020-11-28 07:41:46,637 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-11-28 07:41:46,637 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-11-28 07:41:46,637 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-11-28 07:41:46,645 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 07:41:46" (1/1) ... [2020-11-28 07:41:46,645 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 07:41:46" (1/1) ... [2020-11-28 07:41:46,646 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 07:41:46" (1/1) ... [2020-11-28 07:41:46,647 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 07:41:46" (1/1) ... [2020-11-28 07:41:46,650 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 07:41:46" (1/1) ... [2020-11-28 07:41:46,654 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 07:41:46" (1/1) ... [2020-11-28 07:41:46,655 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 07:41:46" (1/1) ... [2020-11-28 07:41:46,657 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-11-28 07:41:46,658 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-11-28 07:41:46,658 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-11-28 07:41:46,659 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-11-28 07:41:46,660 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 07:41:46" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_2814a227-5f59-41ed-9fe8-50d7c345f1bd/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 07:41:46,731 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-11-28 07:41:46,731 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-11-28 07:41:46,731 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-11-28 07:41:46,731 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-11-28 07:41:47,136 INFO L293 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-11-28 07:41:47,136 INFO L298 CfgBuilder]: Removed 11 assume(true) statements. [2020-11-28 07:41:47,137 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 28.11 07:41:47 BoogieIcfgContainer [2020-11-28 07:41:47,138 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-11-28 07:41:47,140 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-11-28 07:41:47,140 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-11-28 07:41:47,148 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-11-28 07:41:47,148 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 28.11 07:41:46" (1/3) ... [2020-11-28 07:41:47,149 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@10b347b9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 28.11 07:41:47, skipping insertion in model container [2020-11-28 07:41:47,149 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 07:41:46" (2/3) ... [2020-11-28 07:41:47,150 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@10b347b9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 28.11 07:41:47, skipping insertion in model container [2020-11-28 07:41:47,150 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 28.11 07:41:47" (3/3) ... [2020-11-28 07:41:47,152 INFO L111 eAbstractionObserver]: Analyzing ICFG nested9.i [2020-11-28 07:41:47,162 INFO L164 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-11-28 07:41:47,165 INFO L176 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-11-28 07:41:47,179 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-11-28 07:41:47,225 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-11-28 07:41:47,225 INFO L378 AbstractCegarLoop]: Hoare is true [2020-11-28 07:41:47,225 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-11-28 07:41:47,225 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-11-28 07:41:47,226 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-11-28 07:41:47,226 INFO L382 AbstractCegarLoop]: Difference is false [2020-11-28 07:41:47,226 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-11-28 07:41:47,226 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-11-28 07:41:47,242 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states. [2020-11-28 07:41:47,246 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2020-11-28 07:41:47,246 INFO L414 BasicCegarLoop]: Found error trace [2020-11-28 07:41:47,247 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-28 07:41:47,247 INFO L429 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-28 07:41:47,253 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 07:41:47,253 INFO L82 PathProgramCache]: Analyzing trace with hash 859773931, now seen corresponding path program 1 times [2020-11-28 07:41:47,261 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-28 07:41:47,261 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1263145661] [2020-11-28 07:41:47,262 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-28 07:41:47,362 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 07:41:47,507 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 07:41:47,507 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1263145661] [2020-11-28 07:41:47,508 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-28 07:41:47,508 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-11-28 07:41:47,509 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [57860314] [2020-11-28 07:41:47,512 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-11-28 07:41:47,513 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-28 07:41:47,531 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-11-28 07:41:47,532 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-11-28 07:41:47,534 INFO L87 Difference]: Start difference. First operand 17 states. Second operand 6 states. [2020-11-28 07:41:47,715 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-28 07:41:47,715 INFO L93 Difference]: Finished difference Result 52 states and 76 transitions. [2020-11-28 07:41:47,718 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-11-28 07:41:47,720 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 11 [2020-11-28 07:41:47,720 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-28 07:41:47,733 INFO L225 Difference]: With dead ends: 52 [2020-11-28 07:41:47,733 INFO L226 Difference]: Without dead ends: 31 [2020-11-28 07:41:47,736 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=24, Invalid=32, Unknown=0, NotChecked=0, Total=56 [2020-11-28 07:41:47,764 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-11-28 07:41:47,778 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 20. [2020-11-28 07:41:47,779 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-11-28 07:41:47,780 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 26 transitions. [2020-11-28 07:41:47,782 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 26 transitions. Word has length 11 [2020-11-28 07:41:47,782 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-28 07:41:47,782 INFO L481 AbstractCegarLoop]: Abstraction has 20 states and 26 transitions. [2020-11-28 07:41:47,782 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-11-28 07:41:47,783 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 26 transitions. [2020-11-28 07:41:47,783 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-11-28 07:41:47,783 INFO L414 BasicCegarLoop]: Found error trace [2020-11-28 07:41:47,784 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-28 07:41:47,784 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-11-28 07:41:47,784 INFO L429 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-28 07:41:47,785 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 07:41:47,785 INFO L82 PathProgramCache]: Analyzing trace with hash -1761247835, now seen corresponding path program 1 times [2020-11-28 07:41:47,785 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-28 07:41:47,786 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [240896441] [2020-11-28 07:41:47,786 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-28 07:41:47,808 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 07:41:47,938 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-28 07:41:47,939 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [240896441] [2020-11-28 07:41:47,939 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [624479864] [2020-11-28 07:41:47,939 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_2814a227-5f59-41ed-9fe8-50d7c345f1bd/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 07:41:47,993 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 07:41:47,995 INFO L263 TraceCheckSpWp]: Trace formula consists of 63 conjuncts, 7 conjunts are in the unsatisfiable core [2020-11-28 07:41:48,002 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-28 07:41:48,116 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-11-28 07:41:48,122 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-11-28 07:41:48,131 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-11-28 07:41:48,136 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-11-28 07:41:48,210 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 07:41:48,210 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-11-28 07:41:48,230 INFO L603 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-11-28 07:41:48,329 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-28 07:41:48,329 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 2 imperfect interpolant sequences. [2020-11-28 07:41:48,329 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [6, 7] total 15 [2020-11-28 07:41:48,330 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [144367609] [2020-11-28 07:41:48,331 INFO L461 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-11-28 07:41:48,331 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-28 07:41:48,332 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-11-28 07:41:48,333 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=158, Unknown=0, NotChecked=0, Total=210 [2020-11-28 07:41:48,333 INFO L87 Difference]: Start difference. First operand 20 states and 26 transitions. Second operand 7 states. [2020-11-28 07:41:48,496 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-28 07:41:48,497 INFO L93 Difference]: Finished difference Result 35 states and 46 transitions. [2020-11-28 07:41:48,497 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-11-28 07:41:48,497 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 13 [2020-11-28 07:41:48,498 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-28 07:41:48,498 INFO L225 Difference]: With dead ends: 35 [2020-11-28 07:41:48,498 INFO L226 Difference]: Without dead ends: 32 [2020-11-28 07:41:48,500 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 16 SyntacticMatches, 1 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=87, Invalid=219, Unknown=0, NotChecked=0, Total=306 [2020-11-28 07:41:48,500 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-11-28 07:41:48,504 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 15. [2020-11-28 07:41:48,504 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-11-28 07:41:48,505 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 18 transitions. [2020-11-28 07:41:48,505 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 18 transitions. Word has length 13 [2020-11-28 07:41:48,505 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-28 07:41:48,505 INFO L481 AbstractCegarLoop]: Abstraction has 15 states and 18 transitions. [2020-11-28 07:41:48,505 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-11-28 07:41:48,506 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 18 transitions. [2020-11-28 07:41:48,506 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-11-28 07:41:48,506 INFO L414 BasicCegarLoop]: Found error trace [2020-11-28 07:41:48,506 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-28 07:41:48,710 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2020-11-28 07:41:48,711 INFO L429 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-28 07:41:48,711 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 07:41:48,711 INFO L82 PathProgramCache]: Analyzing trace with hash 2014343063, now seen corresponding path program 1 times [2020-11-28 07:41:48,712 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-28 07:41:48,712 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2115317501] [2020-11-28 07:41:48,712 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-28 07:41:48,739 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 07:41:48,851 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-28 07:41:48,852 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2115317501] [2020-11-28 07:41:48,852 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1758474902] [2020-11-28 07:41:48,852 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_2814a227-5f59-41ed-9fe8-50d7c345f1bd/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 07:41:48,907 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 07:41:48,908 INFO L263 TraceCheckSpWp]: Trace formula consists of 65 conjuncts, 3 conjunts are in the unsatisfiable core [2020-11-28 07:41:48,909 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-28 07:41:48,948 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-11-28 07:41:48,948 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-11-28 07:41:48,963 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-11-28 07:41:48,963 INFO L219 FreeRefinementEngine]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2020-11-28 07:41:48,963 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [7] total 10 [2020-11-28 07:41:48,963 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2010040249] [2020-11-28 07:41:48,964 INFO L461 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-11-28 07:41:48,964 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-28 07:41:48,965 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-11-28 07:41:48,965 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2020-11-28 07:41:48,965 INFO L87 Difference]: Start difference. First operand 15 states and 18 transitions. Second operand 5 states. [2020-11-28 07:41:48,997 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-28 07:41:48,997 INFO L93 Difference]: Finished difference Result 27 states and 34 transitions. [2020-11-28 07:41:48,998 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-11-28 07:41:48,999 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 14 [2020-11-28 07:41:48,999 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-28 07:41:48,999 INFO L225 Difference]: With dead ends: 27 [2020-11-28 07:41:48,999 INFO L226 Difference]: Without dead ends: 17 [2020-11-28 07:41:49,000 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2020-11-28 07:41:49,000 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2020-11-28 07:41:49,004 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2020-11-28 07:41:49,004 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-11-28 07:41:49,004 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 20 transitions. [2020-11-28 07:41:49,005 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 20 transitions. Word has length 14 [2020-11-28 07:41:49,005 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-28 07:41:49,005 INFO L481 AbstractCegarLoop]: Abstraction has 17 states and 20 transitions. [2020-11-28 07:41:49,005 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-11-28 07:41:49,005 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 20 transitions. [2020-11-28 07:41:49,006 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-11-28 07:41:49,006 INFO L414 BasicCegarLoop]: Found error trace [2020-11-28 07:41:49,006 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-28 07:41:49,222 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-28 07:41:49,223 INFO L429 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-28 07:41:49,223 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 07:41:49,223 INFO L82 PathProgramCache]: Analyzing trace with hash 1660353437, now seen corresponding path program 1 times [2020-11-28 07:41:49,223 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-28 07:41:49,224 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [131094590] [2020-11-28 07:41:49,224 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-28 07:41:49,243 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 07:41:49,327 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-28 07:41:49,328 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [131094590] [2020-11-28 07:41:49,328 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [631986660] [2020-11-28 07:41:49,328 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_2814a227-5f59-41ed-9fe8-50d7c345f1bd/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 07:41:49,381 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 07:41:49,382 INFO L263 TraceCheckSpWp]: Trace formula consists of 71 conjuncts, 6 conjunts are in the unsatisfiable core [2020-11-28 07:41:49,385 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-28 07:41:49,504 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-28 07:41:49,505 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-11-28 07:41:49,519 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-28 07:41:49,520 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2039512428] [2020-11-28 07:41:49,541 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2020-11-28 07:41:49,541 INFO L166 IcfgInterpreter]: Building call graph [2020-11-28 07:41:49,545 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-11-28 07:41:49,551 INFO L176 IcfgInterpreter]: Starting interpretation [2020-11-28 07:41:49,551 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-11-28 07:41:50,151 INFO L180 IcfgInterpreter]: Interpretation finished [2020-11-28 07:41:50,353 WARN L193 SmtUtils]: Spent 173.00 ms on a formula simplification. DAG size of input: 60 DAG size of output: 46 [2020-11-28 07:41:50,525 WARN L193 SmtUtils]: Spent 146.00 ms on a formula simplification. DAG size of input: 59 DAG size of output: 55 [2020-11-28 07:41:50,734 WARN L193 SmtUtils]: Spent 179.00 ms on a formula simplification. DAG size of input: 63 DAG size of output: 56 [2020-11-28 07:41:50,922 WARN L193 SmtUtils]: Spent 152.00 ms on a formula simplification. DAG size of input: 66 DAG size of output: 56 [2020-11-28 07:41:51,131 WARN L193 SmtUtils]: Spent 164.00 ms on a formula simplification. DAG size of input: 69 DAG size of output: 54 [2020-11-28 07:41:51,487 WARN L193 SmtUtils]: Spent 317.00 ms on a formula simplification. DAG size of input: 54 DAG size of output: 46 [2020-11-28 07:41:52,123 WARN L193 SmtUtils]: Spent 553.00 ms on a formula simplification. DAG size of input: 107 DAG size of output: 60 [2020-11-28 07:41:52,316 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 50 DAG size of output: 40 [2020-11-28 07:41:52,573 WARN L193 SmtUtils]: Spent 178.00 ms on a formula simplification. DAG size of input: 59 DAG size of output: 48 [2020-11-28 07:41:52,758 WARN L193 SmtUtils]: Spent 135.00 ms on a formula simplification. DAG size of input: 61 DAG size of output: 49 [2020-11-28 07:41:52,761 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-11-28 07:41:52,761 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-11-28 07:41:52,761 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 11 [2020-11-28 07:41:52,762 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1250076632] [2020-11-28 07:41:52,762 INFO L461 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-11-28 07:41:52,762 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-28 07:41:52,763 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-11-28 07:41:52,763 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=343, Unknown=0, NotChecked=0, Total=420 [2020-11-28 07:41:52,763 INFO L87 Difference]: Start difference. First operand 17 states and 20 transitions. Second operand 11 states. [2020-11-28 07:41:53,003 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-28 07:41:53,003 INFO L93 Difference]: Finished difference Result 36 states and 47 transitions. [2020-11-28 07:41:53,003 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-11-28 07:41:53,003 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 16 [2020-11-28 07:41:53,004 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-28 07:41:53,004 INFO L225 Difference]: With dead ends: 36 [2020-11-28 07:41:53,005 INFO L226 Difference]: Without dead ends: 26 [2020-11-28 07:41:53,005 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 34 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 145 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=108, Invalid=492, Unknown=0, NotChecked=0, Total=600 [2020-11-28 07:41:53,006 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-11-28 07:41:53,011 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 24. [2020-11-28 07:41:53,011 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-11-28 07:41:53,012 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 30 transitions. [2020-11-28 07:41:53,012 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 30 transitions. Word has length 16 [2020-11-28 07:41:53,012 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-28 07:41:53,012 INFO L481 AbstractCegarLoop]: Abstraction has 24 states and 30 transitions. [2020-11-28 07:41:53,012 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-11-28 07:41:53,012 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 30 transitions. [2020-11-28 07:41:53,013 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-11-28 07:41:53,013 INFO L414 BasicCegarLoop]: Found error trace [2020-11-28 07:41:53,013 INFO L422 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-28 07:41:53,233 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-28 07:41:53,233 INFO L429 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-28 07:41:53,233 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 07:41:53,234 INFO L82 PathProgramCache]: Analyzing trace with hash 1348947927, now seen corresponding path program 1 times [2020-11-28 07:41:53,234 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-28 07:41:53,234 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1482303088] [2020-11-28 07:41:53,234 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-28 07:41:53,263 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 07:41:53,336 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 2 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2020-11-28 07:41:53,336 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1482303088] [2020-11-28 07:41:53,336 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1937211738] [2020-11-28 07:41:53,336 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_2814a227-5f59-41ed-9fe8-50d7c345f1bd/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 07:41:53,383 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 07:41:53,384 INFO L263 TraceCheckSpWp]: Trace formula consists of 83 conjuncts, 5 conjunts are in the unsatisfiable core [2020-11-28 07:41:53,386 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-28 07:41:53,497 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 10 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-11-28 07:41:53,497 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-11-28 07:41:53,591 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 9 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-11-28 07:41:53,591 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 2 imperfect interpolant sequences. [2020-11-28 07:41:53,591 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [7, 6] total 13 [2020-11-28 07:41:53,592 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1993907580] [2020-11-28 07:41:53,592 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-11-28 07:41:53,592 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-28 07:41:53,593 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-11-28 07:41:53,593 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=127, Unknown=0, NotChecked=0, Total=156 [2020-11-28 07:41:53,593 INFO L87 Difference]: Start difference. First operand 24 states and 30 transitions. Second operand 6 states. [2020-11-28 07:41:53,685 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-28 07:41:53,685 INFO L93 Difference]: Finished difference Result 40 states and 51 transitions. [2020-11-28 07:41:53,686 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-11-28 07:41:53,687 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 20 [2020-11-28 07:41:53,687 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-28 07:41:53,687 INFO L225 Difference]: With dead ends: 40 [2020-11-28 07:41:53,687 INFO L226 Difference]: Without dead ends: 25 [2020-11-28 07:41:53,688 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 33 SyntacticMatches, 1 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=37, Invalid=145, Unknown=0, NotChecked=0, Total=182 [2020-11-28 07:41:53,688 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2020-11-28 07:41:53,693 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 24. [2020-11-28 07:41:53,693 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-11-28 07:41:53,694 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 28 transitions. [2020-11-28 07:41:53,694 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 28 transitions. Word has length 20 [2020-11-28 07:41:53,694 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-28 07:41:53,694 INFO L481 AbstractCegarLoop]: Abstraction has 24 states and 28 transitions. [2020-11-28 07:41:53,694 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-11-28 07:41:53,694 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 28 transitions. [2020-11-28 07:41:53,695 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-11-28 07:41:53,695 INFO L414 BasicCegarLoop]: Found error trace [2020-11-28 07:41:53,695 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-28 07:41:53,895 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-28 07:41:53,896 INFO L429 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-28 07:41:53,896 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 07:41:53,896 INFO L82 PathProgramCache]: Analyzing trace with hash -127751457, now seen corresponding path program 2 times [2020-11-28 07:41:53,896 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-28 07:41:53,897 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [266973595] [2020-11-28 07:41:53,897 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-28 07:41:53,911 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 07:41:53,963 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-11-28 07:41:53,963 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [266973595] [2020-11-28 07:41:53,963 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [736914511] [2020-11-28 07:41:53,963 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_2814a227-5f59-41ed-9fe8-50d7c345f1bd/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 07:41:54,012 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 1 check-sat command(s) [2020-11-28 07:41:54,012 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-11-28 07:41:54,013 INFO L263 TraceCheckSpWp]: Trace formula consists of 57 conjuncts, 6 conjunts are in the unsatisfiable core [2020-11-28 07:41:54,014 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-28 07:41:54,096 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 10 proven. 1 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2020-11-28 07:41:54,096 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-11-28 07:41:54,155 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 10 proven. 1 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2020-11-28 07:41:54,156 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1170910130] [2020-11-28 07:41:54,158 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2020-11-28 07:41:54,158 INFO L166 IcfgInterpreter]: Building call graph [2020-11-28 07:41:54,159 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-11-28 07:41:54,159 INFO L176 IcfgInterpreter]: Starting interpretation [2020-11-28 07:41:54,159 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-11-28 07:41:54,908 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 07:41:54,911 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-11-28 07:41:54,911 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 5, 5] total 12 [2020-11-28 07:41:54,911 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1604498927] [2020-11-28 07:41:54,912 INFO L461 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-11-28 07:41:54,912 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-28 07:41:54,912 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-11-28 07:41:54,913 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=104, Unknown=0, NotChecked=0, Total=132 [2020-11-28 07:41:54,913 INFO L87 Difference]: Start difference. First operand 24 states and 28 transitions. Second operand 12 states. [2020-11-28 07:41:55,117 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-28 07:41:55,118 INFO L93 Difference]: Finished difference Result 40 states and 50 transitions. [2020-11-28 07:41:55,118 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-11-28 07:41:55,118 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 23 [2020-11-28 07:41:55,119 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-28 07:41:55,119 INFO L225 Difference]: With dead ends: 40 [2020-11-28 07:41:55,119 INFO L226 Difference]: Without dead ends: 0 [2020-11-28 07:41:55,120 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 40 SyntacticMatches, 1 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=84, Invalid=222, Unknown=0, NotChecked=0, Total=306 [2020-11-28 07:41:55,120 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-11-28 07:41:55,120 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-11-28 07:41:55,121 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-11-28 07:41:55,121 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-11-28 07:41:55,121 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 23 [2020-11-28 07:41:55,121 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-28 07:41:55,121 INFO L481 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-11-28 07:41:55,121 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-11-28 07:41:55,121 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-11-28 07:41:55,122 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-11-28 07:41:55,322 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2020-11-28 07:41:55,323 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-11-28 07:41:55,632 WARN L193 SmtUtils]: Spent 171.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 28 [2020-11-28 07:41:55,702 INFO L270 CegarLoopResult]: At program point L35-3(lines 35 37) the Hoare annotation is: (let ((.cse2 (* 2 ULTIMATE.start_main_~i~0))) (let ((.cse1 (< ULTIMATE.start_main_~i~0 ULTIMATE.start_main_~n~0)) (.cse0 (<= .cse2 ULTIMATE.start_main_~j~0))) (or (and .cse0 .cse1 (< ULTIMATE.start_main_~j~0 (+ (* 2 ULTIMATE.start_main_~n~0) ULTIMATE.start_main_~i~0 2)) (<= 1 ULTIMATE.start___VERIFIER_assert_~cond) (<= 1 ULTIMATE.start_main_~i~0)) (and .cse0 .cse1 (<= ULTIMATE.start_main_~i~0 1) (< ULTIMATE.start_main_~j~0 (* 3 ULTIMATE.start_main_~i~0))) (and .cse0 (= ULTIMATE.start_main_~i~0 0) (<= (+ ULTIMATE.start_main_~i~0 1) ULTIMATE.start_main_~n~0) (<= ULTIMATE.start_main_~j~0 .cse2))))) [2020-11-28 07:41:55,702 INFO L274 CegarLoopResult]: For program point L31(line 31) no Hoare annotation was computed. [2020-11-28 07:41:55,702 INFO L270 CegarLoopResult]: At program point L36-2(lines 36 37) the Hoare annotation is: (let ((.cse0 (<= (* 2 ULTIMATE.start_main_~i~0) ULTIMATE.start_main_~j~0)) (.cse1 (< ULTIMATE.start_main_~i~0 ULTIMATE.start_main_~n~0)) (.cse2 (< ULTIMATE.start_main_~j~0 (* 3 ULTIMATE.start_main_~i~0)))) (or (and .cse0 (<= (+ (div (+ ULTIMATE.start_main_~j~0 (- 1)) 2) 1) ULTIMATE.start_main_~k~0) .cse1 (<= ULTIMATE.start_main_~k~0 (div ULTIMATE.start_main_~j~0 2)) (<= ULTIMATE.start_main_~i~0 1) .cse2) (and .cse0 .cse1 (<= 1 ULTIMATE.start___VERIFIER_assert_~cond) .cse2))) [2020-11-28 07:41:55,702 INFO L274 CegarLoopResult]: For program point L32(line 32) no Hoare annotation was computed. [2020-11-28 07:41:55,702 INFO L274 CegarLoopResult]: For program point ULTIMATE.startENTRY(line -1) no Hoare annotation was computed. [2020-11-28 07:41:55,702 INFO L274 CegarLoopResult]: For program point ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION(line 12) no Hoare annotation was computed. [2020-11-28 07:41:55,703 INFO L274 CegarLoopResult]: For program point L12(line 12) no Hoare annotation was computed. [2020-11-28 07:41:55,703 INFO L274 CegarLoopResult]: For program point L12-2(line 12) no Hoare annotation was computed. [2020-11-28 07:41:55,703 INFO L274 CegarLoopResult]: For program point L12-3(line 12) no Hoare annotation was computed. [2020-11-28 07:41:55,703 INFO L274 CegarLoopResult]: For program point L33(line 33) no Hoare annotation was computed. [2020-11-28 07:41:55,703 INFO L274 CegarLoopResult]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2020-11-28 07:41:55,703 INFO L277 CegarLoopResult]: At program point L38(lines 25 40) the Hoare annotation is: true [2020-11-28 07:41:55,703 INFO L270 CegarLoopResult]: At program point L34-3(lines 34 37) the Hoare annotation is: (let ((.cse3 (* 2 ULTIMATE.start_main_~i~0)) (.cse1 (* 2 ULTIMATE.start_main_~n~0))) (let ((.cse0 (<= .cse3 (+ .cse1 2))) (.cse2 (<= 1 ULTIMATE.start_main_~i~0))) (or (= ULTIMATE.start_main_~i~0 0) (and (<= 2 ULTIMATE.start_main_~n~0) .cse0 (< ULTIMATE.start_main_~j~0 (+ .cse1 ULTIMATE.start_main_~i~0 2)) (<= 1 ULTIMATE.start___VERIFIER_assert_~cond) .cse2) (and .cse0 (<= ULTIMATE.start_main_~i~0 1) .cse2 (<= ULTIMATE.start_main_~j~0 .cse3))))) [2020-11-28 07:41:55,703 INFO L274 CegarLoopResult]: For program point L30(line 30) no Hoare annotation was computed. [2020-11-28 07:41:55,704 INFO L274 CegarLoopResult]: For program point L18(lines 18 20) no Hoare annotation was computed. [2020-11-28 07:41:55,704 INFO L270 CegarLoopResult]: At program point L18-2(lines 1 40) the Hoare annotation is: (and (<= (* 2 ULTIMATE.start_main_~i~0) ULTIMATE.start_main_~j~0) (< ULTIMATE.start_main_~i~0 ULTIMATE.start_main_~n~0) (<= 1 ULTIMATE.start___VERIFIER_assert_~cond) (< ULTIMATE.start_main_~j~0 (* 3 ULTIMATE.start_main_~i~0))) [2020-11-28 07:41:55,704 INFO L277 CegarLoopResult]: At program point L39(lines 25 40) the Hoare annotation is: true [2020-11-28 07:41:55,722 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 28.11 07:41:55 BoogieIcfgContainer [2020-11-28 07:41:55,722 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-11-28 07:41:55,723 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2020-11-28 07:41:55,723 INFO L271 PluginConnector]: Initializing Witness Printer... [2020-11-28 07:41:55,723 INFO L275 PluginConnector]: Witness Printer initialized [2020-11-28 07:41:55,723 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 28.11 07:41:47" (3/4) ... [2020-11-28 07:41:55,726 INFO L137 WitnessPrinter]: Generating witness for correct program [2020-11-28 07:41:55,735 INFO L902 BoogieBacktranslator]: Reduced CFG by removing 13 nodes and edges [2020-11-28 07:41:55,736 INFO L902 BoogieBacktranslator]: Reduced CFG by removing 6 nodes and edges [2020-11-28 07:41:55,736 INFO L902 BoogieBacktranslator]: Reduced CFG by removing 1 nodes and edges [2020-11-28 07:41:55,736 INFO L902 BoogieBacktranslator]: Reduced CFG by removing 1 nodes and edges [2020-11-28 07:41:55,780 INFO L141 WitnessManager]: Wrote witness to /tmp/vcloud-vcloud-master/worker/run_dir_2814a227-5f59-41ed-9fe8-50d7c345f1bd/bin/utaipan/witness.graphml [2020-11-28 07:41:55,780 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2020-11-28 07:41:55,781 INFO L168 Benchmark]: Toolchain (without parser) took 9445.07 ms. Allocated memory was 127.9 MB in the beginning and 155.2 MB in the end (delta: 27.3 MB). Free memory was 91.6 MB in the beginning and 106.6 MB in the end (delta: -15.0 MB). Peak memory consumption was 11.4 MB. Max. memory is 16.1 GB. [2020-11-28 07:41:55,782 INFO L168 Benchmark]: CDTParser took 0.27 ms. Allocated memory is still 127.9 MB. Free memory was 99.6 MB in the beginning and 99.6 MB in the end (delta: 27.8 kB). There was no memory consumed. Max. memory is 16.1 GB. [2020-11-28 07:41:55,782 INFO L168 Benchmark]: CACSL2BoogieTranslator took 266.15 ms. Allocated memory is still 127.9 MB. Free memory was 91.4 MB in the beginning and 102.2 MB in the end (delta: -10.8 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. [2020-11-28 07:41:55,783 INFO L168 Benchmark]: Boogie Procedure Inliner took 31.58 ms. Allocated memory is still 127.9 MB. Free memory was 102.2 MB in the beginning and 100.9 MB in the end (delta: 1.3 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2020-11-28 07:41:55,785 INFO L168 Benchmark]: Boogie Preprocessor took 20.86 ms. Allocated memory is still 127.9 MB. Free memory was 100.9 MB in the beginning and 99.4 MB in the end (delta: 1.5 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2020-11-28 07:41:55,787 INFO L168 Benchmark]: RCFGBuilder took 479.59 ms. Allocated memory is still 127.9 MB. Free memory was 99.4 MB in the beginning and 82.0 MB in the end (delta: 17.4 MB). Peak memory consumption was 16.8 MB. Max. memory is 16.1 GB. [2020-11-28 07:41:55,789 INFO L168 Benchmark]: TraceAbstraction took 8582.74 ms. Allocated memory was 127.9 MB in the beginning and 155.2 MB in the end (delta: 27.3 MB). Free memory was 81.5 MB in the beginning and 109.7 MB in the end (delta: -28.3 MB). Peak memory consumption was 71.4 MB. Max. memory is 16.1 GB. [2020-11-28 07:41:55,790 INFO L168 Benchmark]: Witness Printer took 57.62 ms. Allocated memory is still 155.2 MB. Free memory was 109.7 MB in the beginning and 106.6 MB in the end (delta: 3.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2020-11-28 07:41:55,792 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.27 ms. Allocated memory is still 127.9 MB. Free memory was 99.6 MB in the beginning and 99.6 MB in the end (delta: 27.8 kB). There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 266.15 ms. Allocated memory is still 127.9 MB. Free memory was 91.4 MB in the beginning and 102.2 MB in the end (delta: -10.8 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. * Boogie Procedure Inliner took 31.58 ms. Allocated memory is still 127.9 MB. Free memory was 102.2 MB in the beginning and 100.9 MB in the end (delta: 1.3 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * Boogie Preprocessor took 20.86 ms. Allocated memory is still 127.9 MB. Free memory was 100.9 MB in the beginning and 99.4 MB in the end (delta: 1.5 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * RCFGBuilder took 479.59 ms. Allocated memory is still 127.9 MB. Free memory was 99.4 MB in the beginning and 82.0 MB in the end (delta: 17.4 MB). Peak memory consumption was 16.8 MB. Max. memory is 16.1 GB. * TraceAbstraction took 8582.74 ms. Allocated memory was 127.9 MB in the beginning and 155.2 MB in the end (delta: 27.3 MB). Free memory was 81.5 MB in the beginning and 109.7 MB in the end (delta: -28.3 MB). Peak memory consumption was 71.4 MB. Max. memory is 16.1 GB. * Witness Printer took 57.62 ms. Allocated memory is still 155.2 MB. Free memory was 109.7 MB in the beginning and 106.6 MB in the end (delta: 3.1 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: 12]: 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: 34]: Loop Invariant Derived loop invariant: (i == 0 || ((((2 <= n && 2 * i <= 2 * n + 2) && j < 2 * n + i + 2) && 1 <= cond) && 1 <= i)) || (((2 * i <= 2 * n + 2 && i <= 1) && 1 <= i) && j <= 2 * i) - InvariantResult [Line: 1]: Loop Invariant Derived loop invariant: ((2 * i <= j && i < n) && 1 <= cond) && j < 3 * i - InvariantResult [Line: 35]: Loop Invariant Derived loop invariant: (((((2 * i <= j && i < n) && j < 2 * n + i + 2) && 1 <= cond) && 1 <= i) || (((2 * i <= j && i < n) && i <= 1) && j < 3 * i)) || (((2 * i <= j && i == 0) && i + 1 <= n) && j <= 2 * i) - InvariantResult [Line: 25]: Loop Invariant Derived loop invariant: 1 - InvariantResult [Line: 25]: Loop Invariant Derived loop invariant: 1 - InvariantResult [Line: 36]: Loop Invariant Derived loop invariant: (((((2 * i <= j && (j + -1) / 2 + 1 <= k) && i < n) && k <= j / 2) && i <= 1) && j < 3 * i) || (((2 * i <= j && i < n) && 1 <= cond) && j < 3 * i) - StatisticsResult: Ultimate Automizer benchmark data CFG has 1 procedures, 17 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 8.1s, OverallIterations: 6, TraceHistogramMax: 3, AutomataDifference: 0.9s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.3s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 77 SDtfs, 121 SDslu, 185 SDs, 0 SdLazy, 296 SolverSat, 50 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.4s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 234 GetRequests, 150 SyntacticMatches, 3 SemanticMatches, 81 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 256 ImplicationChecksByTransitivity, 3.7s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=24occurred in iteration=4, 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, 6 MinimizatonAttempts, 31 StatesRemovedByMinimization, 4 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 6 LocationsWithAnnotation, 6 PreInvPairs, 27 NumberOfFragments, 180 HoareAnnotationTreeSize, 6 FomulaSimplifications, 1319 FormulaSimplificationTreeSizeReduction, 0.0s HoareSimplificationTime, 6 FomulaSimplificationsInter, 137 FormulaSimplificationTreeSizeReductionInter, 0.3s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.2s SatisfiabilityAnalysisTime, 1.4s InterpolantComputationTime, 183 NumberOfCodeBlocks, 171 NumberOfCodeBlocksAsserted, 11 NumberOfCheckSat, 253 ConstructedInterpolants, 0 QuantifiedInterpolants, 12714 SizeOfPredicates, 23 NumberOfNonLiveVariables, 339 ConjunctsInSsa, 27 ConjunctsInUnsatCore, 16 InterpolantComputations, 5 PerfectInterpolantSequences, 88/120 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...