./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/loop-simple/nested_2.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_af1d5482-cd30-4780-b87c-381c5eae11b0/bin/utaipan/data/config -Xmx15G -Xms4m -jar /tmp/vcloud-vcloud-master/worker/run_dir_af1d5482-cd30-4780-b87c-381c5eae11b0/bin/utaipan/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/run_dir_af1d5482-cd30-4780-b87c-381c5eae11b0/bin/utaipan/data -tc /tmp/vcloud-vcloud-master/worker/run_dir_af1d5482-cd30-4780-b87c-381c5eae11b0/bin/utaipan/config/TaipanReach.xml -i ../../sv-benchmarks/c/loop-simple/nested_2.c -s /tmp/vcloud-vcloud-master/worker/run_dir_af1d5482-cd30-4780-b87c-381c5eae11b0/bin/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/run_dir_af1d5482-cd30-4780-b87c-381c5eae11b0/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 93ddc895418216afe230ea40e87acd63de5c2d0d ............................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................. 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 07:38:07,203 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-11-28 07:38:07,206 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-11-28 07:38:07,260 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-11-28 07:38:07,261 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-11-28 07:38:07,262 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-11-28 07:38:07,264 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-11-28 07:38:07,267 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-11-28 07:38:07,269 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-11-28 07:38:07,271 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-11-28 07:38:07,272 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-11-28 07:38:07,273 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-11-28 07:38:07,274 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-11-28 07:38:07,275 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-11-28 07:38:07,277 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-11-28 07:38:07,278 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-11-28 07:38:07,280 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-11-28 07:38:07,281 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-11-28 07:38:07,283 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-11-28 07:38:07,286 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-11-28 07:38:07,288 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-11-28 07:38:07,289 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-11-28 07:38:07,291 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-11-28 07:38:07,292 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-11-28 07:38:07,295 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-11-28 07:38:07,296 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-11-28 07:38:07,296 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-11-28 07:38:07,297 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-11-28 07:38:07,298 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-11-28 07:38:07,299 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-11-28 07:38:07,300 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-11-28 07:38:07,301 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-11-28 07:38:07,302 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-11-28 07:38:07,303 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-11-28 07:38:07,305 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-11-28 07:38:07,305 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-11-28 07:38:07,306 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-11-28 07:38:07,306 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-11-28 07:38:07,306 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-11-28 07:38:07,307 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-11-28 07:38:07,308 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-11-28 07:38:07,309 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud-vcloud-master/worker/run_dir_af1d5482-cd30-4780-b87c-381c5eae11b0/bin/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf [2020-11-28 07:38:07,334 INFO L113 SettingsManager]: Loading preferences was successful [2020-11-28 07:38:07,334 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-11-28 07:38:07,335 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2020-11-28 07:38:07,335 INFO L138 SettingsManager]: * User list type=DISABLED [2020-11-28 07:38:07,336 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2020-11-28 07:38:07,336 INFO L138 SettingsManager]: * Explicit value domain=true [2020-11-28 07:38:07,336 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2020-11-28 07:38:07,336 INFO L138 SettingsManager]: * Octagon Domain=false [2020-11-28 07:38:07,336 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2020-11-28 07:38:07,337 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2020-11-28 07:38:07,337 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2020-11-28 07:38:07,337 INFO L138 SettingsManager]: * Interval Domain=false [2020-11-28 07:38:07,337 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2020-11-28 07:38:07,338 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2020-11-28 07:38:07,338 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2020-11-28 07:38:07,339 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-11-28 07:38:07,339 INFO L138 SettingsManager]: * sizeof long=4 [2020-11-28 07:38:07,339 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-11-28 07:38:07,339 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-11-28 07:38:07,339 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-11-28 07:38:07,340 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-11-28 07:38:07,340 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-11-28 07:38:07,340 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-11-28 07:38:07,340 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2020-11-28 07:38:07,340 INFO L138 SettingsManager]: * sizeof long double=12 [2020-11-28 07:38:07,341 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-11-28 07:38:07,341 INFO L138 SettingsManager]: * Use constant arrays=true [2020-11-28 07:38:07,341 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-11-28 07:38:07,341 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-11-28 07:38:07,342 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-11-28 07:38:07,342 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-11-28 07:38:07,342 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-11-28 07:38:07,342 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-11-28 07:38:07,342 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-11-28 07:38:07,343 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-11-28 07:38:07,343 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2020-11-28 07:38:07,343 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-11-28 07:38:07,343 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-11-28 07:38:07,343 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-11-28 07:38:07,344 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2020-11-28 07:38:07,344 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_af1d5482-cd30-4780-b87c-381c5eae11b0/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud-vcloud-master/worker/run_dir_af1d5482-cd30-4780-b87c-381c5eae11b0/bin/utaipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 93ddc895418216afe230ea40e87acd63de5c2d0d [2020-11-28 07:38:07,577 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-11-28 07:38:07,598 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-11-28 07:38:07,600 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-11-28 07:38:07,602 INFO L271 PluginConnector]: Initializing CDTParser... [2020-11-28 07:38:07,603 INFO L275 PluginConnector]: CDTParser initialized [2020-11-28 07:38:07,603 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/run_dir_af1d5482-cd30-4780-b87c-381c5eae11b0/bin/utaipan/../../sv-benchmarks/c/loop-simple/nested_2.c [2020-11-28 07:38:07,669 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_af1d5482-cd30-4780-b87c-381c5eae11b0/bin/utaipan/data/b4bbba5d9/b7ee1564264e4f3c8aee86e5edbb95b4/FLAG3b9c8c21e [2020-11-28 07:38:08,115 INFO L306 CDTParser]: Found 1 translation units. [2020-11-28 07:38:08,115 INFO L160 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/run_dir_af1d5482-cd30-4780-b87c-381c5eae11b0/sv-benchmarks/c/loop-simple/nested_2.c [2020-11-28 07:38:08,122 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_af1d5482-cd30-4780-b87c-381c5eae11b0/bin/utaipan/data/b4bbba5d9/b7ee1564264e4f3c8aee86e5edbb95b4/FLAG3b9c8c21e [2020-11-28 07:38:08,525 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/run_dir_af1d5482-cd30-4780-b87c-381c5eae11b0/bin/utaipan/data/b4bbba5d9/b7ee1564264e4f3c8aee86e5edbb95b4 [2020-11-28 07:38:08,528 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-11-28 07:38:08,530 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2020-11-28 07:38:08,534 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-11-28 07:38:08,534 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-11-28 07:38:08,545 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-11-28 07:38:08,546 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 28.11 07:38:08" (1/1) ... [2020-11-28 07:38:08,553 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@78322634 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 07:38:08, skipping insertion in model container [2020-11-28 07:38:08,553 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 28.11 07:38:08" (1/1) ... [2020-11-28 07:38:08,563 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-11-28 07:38:08,577 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-11-28 07:38:08,778 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-11-28 07:38:08,804 INFO L203 MainTranslator]: Completed pre-run [2020-11-28 07:38:08,819 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-11-28 07:38:08,832 INFO L208 MainTranslator]: Completed translation [2020-11-28 07:38:08,833 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 07:38:08 WrapperNode [2020-11-28 07:38:08,833 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-11-28 07:38:08,834 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2020-11-28 07:38:08,835 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2020-11-28 07:38:08,835 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2020-11-28 07:38:08,844 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 07:38:08" (1/1) ... [2020-11-28 07:38:08,851 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 07:38:08" (1/1) ... [2020-11-28 07:38:08,868 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2020-11-28 07:38:08,869 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-11-28 07:38:08,869 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-11-28 07:38:08,869 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-11-28 07:38:08,879 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 07:38:08" (1/1) ... [2020-11-28 07:38:08,880 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 07:38:08" (1/1) ... [2020-11-28 07:38:08,881 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 07:38:08" (1/1) ... [2020-11-28 07:38:08,881 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 07:38:08" (1/1) ... [2020-11-28 07:38:08,885 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 07:38:08" (1/1) ... [2020-11-28 07:38:08,889 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 07:38:08" (1/1) ... [2020-11-28 07:38:08,891 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 07:38:08" (1/1) ... [2020-11-28 07:38:08,892 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-11-28 07:38:08,893 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-11-28 07:38:08,894 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-11-28 07:38:08,894 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-11-28 07:38:08,895 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 07:38:08" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_af1d5482-cd30-4780-b87c-381c5eae11b0/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 07:38:08,978 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-11-28 07:38:08,978 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-11-28 07:38:08,978 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-11-28 07:38:08,978 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-11-28 07:38:09,256 INFO L293 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-11-28 07:38:09,256 INFO L298 CfgBuilder]: Removed 8 assume(true) statements. [2020-11-28 07:38:09,259 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 28.11 07:38:09 BoogieIcfgContainer [2020-11-28 07:38:09,259 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-11-28 07:38:09,261 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-11-28 07:38:09,261 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-11-28 07:38:09,280 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-11-28 07:38:09,280 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 28.11 07:38:08" (1/3) ... [2020-11-28 07:38:09,281 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@308366a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 28.11 07:38:09, skipping insertion in model container [2020-11-28 07:38:09,281 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 07:38:08" (2/3) ... [2020-11-28 07:38:09,282 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@308366a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 28.11 07:38:09, skipping insertion in model container [2020-11-28 07:38:09,282 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 28.11 07:38:09" (3/3) ... [2020-11-28 07:38:09,284 INFO L111 eAbstractionObserver]: Analyzing ICFG nested_2.c [2020-11-28 07:38:09,298 INFO L164 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-11-28 07:38:09,303 INFO L176 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-11-28 07:38:09,321 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-11-28 07:38:09,347 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-11-28 07:38:09,347 INFO L378 AbstractCegarLoop]: Hoare is true [2020-11-28 07:38:09,347 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-11-28 07:38:09,347 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-11-28 07:38:09,364 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-11-28 07:38:09,364 INFO L382 AbstractCegarLoop]: Difference is false [2020-11-28 07:38:09,364 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-11-28 07:38:09,364 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-11-28 07:38:09,376 INFO L276 IsEmpty]: Start isEmpty. Operand 8 states. [2020-11-28 07:38:09,400 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2020-11-28 07:38:09,401 INFO L414 BasicCegarLoop]: Found error trace [2020-11-28 07:38:09,401 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1] [2020-11-28 07:38:09,402 INFO L429 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-28 07:38:09,407 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 07:38:09,407 INFO L82 PathProgramCache]: Analyzing trace with hash 2189158, now seen corresponding path program 1 times [2020-11-28 07:38:09,418 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-28 07:38:09,418 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1909837626] [2020-11-28 07:38:09,419 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-28 07:38:09,517 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 07:38:09,589 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 07:38:09,589 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1909837626] [2020-11-28 07:38:09,590 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-28 07:38:09,591 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-11-28 07:38:09,591 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [909709801] [2020-11-28 07:38:09,596 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-11-28 07:38:09,597 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-28 07:38:09,611 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-11-28 07:38:09,612 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-11-28 07:38:09,614 INFO L87 Difference]: Start difference. First operand 8 states. Second operand 3 states. [2020-11-28 07:38:09,668 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-28 07:38:09,669 INFO L93 Difference]: Finished difference Result 15 states and 19 transitions. [2020-11-28 07:38:09,669 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-11-28 07:38:09,671 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 4 [2020-11-28 07:38:09,671 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-28 07:38:09,685 INFO L225 Difference]: With dead ends: 15 [2020-11-28 07:38:09,686 INFO L226 Difference]: Without dead ends: 8 [2020-11-28 07:38:09,689 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 07:38:09,718 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8 states. [2020-11-28 07:38:09,731 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8 to 7. [2020-11-28 07:38:09,732 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7 states. [2020-11-28 07:38:09,733 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7 states to 7 states and 8 transitions. [2020-11-28 07:38:09,734 INFO L78 Accepts]: Start accepts. Automaton has 7 states and 8 transitions. Word has length 4 [2020-11-28 07:38:09,735 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-28 07:38:09,735 INFO L481 AbstractCegarLoop]: Abstraction has 7 states and 8 transitions. [2020-11-28 07:38:09,735 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-11-28 07:38:09,735 INFO L276 IsEmpty]: Start isEmpty. Operand 7 states and 8 transitions. [2020-11-28 07:38:09,736 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2020-11-28 07:38:09,736 INFO L414 BasicCegarLoop]: Found error trace [2020-11-28 07:38:09,736 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2020-11-28 07:38:09,736 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-11-28 07:38:09,737 INFO L429 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-28 07:38:09,742 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 07:38:09,742 INFO L82 PathProgramCache]: Analyzing trace with hash 2071978465, now seen corresponding path program 1 times [2020-11-28 07:38:09,742 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-28 07:38:09,743 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1799020334] [2020-11-28 07:38:09,743 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-28 07:38:09,783 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 07:38:09,807 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 07:38:09,807 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1799020334] [2020-11-28 07:38:09,807 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-28 07:38:09,808 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-11-28 07:38:09,808 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [366765911] [2020-11-28 07:38:09,809 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-11-28 07:38:09,809 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-28 07:38:09,810 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-11-28 07:38:09,810 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-11-28 07:38:09,811 INFO L87 Difference]: Start difference. First operand 7 states and 8 transitions. Second operand 3 states. [2020-11-28 07:38:09,831 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-28 07:38:09,831 INFO L93 Difference]: Finished difference Result 13 states and 16 transitions. [2020-11-28 07:38:09,833 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-11-28 07:38:09,833 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 6 [2020-11-28 07:38:09,833 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-28 07:38:09,833 INFO L225 Difference]: With dead ends: 13 [2020-11-28 07:38:09,834 INFO L226 Difference]: Without dead ends: 8 [2020-11-28 07:38:09,834 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 07:38:09,835 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8 states. [2020-11-28 07:38:09,836 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8 to 8. [2020-11-28 07:38:09,837 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 8 states. [2020-11-28 07:38:09,837 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8 states to 8 states and 9 transitions. [2020-11-28 07:38:09,837 INFO L78 Accepts]: Start accepts. Automaton has 8 states and 9 transitions. Word has length 6 [2020-11-28 07:38:09,838 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-28 07:38:09,838 INFO L481 AbstractCegarLoop]: Abstraction has 8 states and 9 transitions. [2020-11-28 07:38:09,838 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-11-28 07:38:09,838 INFO L276 IsEmpty]: Start isEmpty. Operand 8 states and 9 transitions. [2020-11-28 07:38:09,838 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2020-11-28 07:38:09,838 INFO L414 BasicCegarLoop]: Found error trace [2020-11-28 07:38:09,839 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2020-11-28 07:38:09,839 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-11-28 07:38:09,839 INFO L429 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-28 07:38:09,841 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 07:38:09,841 INFO L82 PathProgramCache]: Analyzing trace with hash -196797112, now seen corresponding path program 1 times [2020-11-28 07:38:09,841 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-28 07:38:09,843 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [57426052] [2020-11-28 07:38:09,843 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-28 07:38:09,872 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 07:38:09,913 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 07:38:09,913 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [57426052] [2020-11-28 07:38:09,914 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1774470596] [2020-11-28 07:38:09,914 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_af1d5482-cd30-4780-b87c-381c5eae11b0/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 07:38:09,978 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 07:38:09,980 INFO L263 TraceCheckSpWp]: Trace formula consists of 47 conjuncts, 3 conjunts are in the unsatisfiable core [2020-11-28 07:38:09,986 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-28 07:38:10,056 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 07:38:10,057 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-11-28 07:38:10,093 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 07:38:10,094 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [174009000] [2020-11-28 07:38:10,126 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2020-11-28 07:38:10,126 INFO L166 IcfgInterpreter]: Building call graph [2020-11-28 07:38:10,133 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-11-28 07:38:10,140 INFO L176 IcfgInterpreter]: Starting interpretation [2020-11-28 07:38:10,141 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-11-28 07:38:11,208 INFO L180 IcfgInterpreter]: Interpretation finished [2020-11-28 07:38:11,376 WARN L193 SmtUtils]: Spent 145.00 ms on a formula simplification. DAG size of input: 90 DAG size of output: 36 [2020-11-28 07:38:11,741 WARN L193 SmtUtils]: Spent 341.00 ms on a formula simplification. DAG size of input: 85 DAG size of output: 70 [2020-11-28 07:38:11,983 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 86 DAG size of output: 31 [2020-11-28 07:38:11,986 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-11-28 07:38:11,986 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-11-28 07:38:11,986 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 7 [2020-11-28 07:38:11,987 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [734754891] [2020-11-28 07:38:11,987 INFO L461 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-11-28 07:38:11,987 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-28 07:38:11,988 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-11-28 07:38:11,988 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=75, Unknown=0, NotChecked=0, Total=110 [2020-11-28 07:38:11,988 INFO L87 Difference]: Start difference. First operand 8 states and 9 transitions. Second operand 7 states. [2020-11-28 07:38:12,019 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-28 07:38:12,020 INFO L93 Difference]: Finished difference Result 17 states and 22 transitions. [2020-11-28 07:38:12,021 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-11-28 07:38:12,021 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 7 [2020-11-28 07:38:12,022 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-28 07:38:12,022 INFO L225 Difference]: With dead ends: 17 [2020-11-28 07:38:12,022 INFO L226 Difference]: Without dead ends: 11 [2020-11-28 07:38:12,023 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=35, Invalid=75, Unknown=0, NotChecked=0, Total=110 [2020-11-28 07:38:12,023 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11 states. [2020-11-28 07:38:12,025 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11 to 11. [2020-11-28 07:38:12,025 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 11 states. [2020-11-28 07:38:12,025 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 12 transitions. [2020-11-28 07:38:12,025 INFO L78 Accepts]: Start accepts. Automaton has 11 states and 12 transitions. Word has length 7 [2020-11-28 07:38:12,025 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-28 07:38:12,026 INFO L481 AbstractCegarLoop]: Abstraction has 11 states and 12 transitions. [2020-11-28 07:38:12,026 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-11-28 07:38:12,026 INFO L276 IsEmpty]: Start isEmpty. Operand 11 states and 12 transitions. [2020-11-28 07:38:12,026 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-11-28 07:38:12,026 INFO L414 BasicCegarLoop]: Found error trace [2020-11-28 07:38:12,026 INFO L422 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1] [2020-11-28 07:38:12,240 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2020-11-28 07:38:12,240 INFO L429 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-28 07:38:12,241 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 07:38:12,241 INFO L82 PathProgramCache]: Analyzing trace with hash 547816353, now seen corresponding path program 2 times [2020-11-28 07:38:12,241 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-28 07:38:12,241 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1817786624] [2020-11-28 07:38:12,241 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-28 07:38:12,253 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 07:38:12,287 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2020-11-28 07:38:12,287 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1817786624] [2020-11-28 07:38:12,287 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [44351129] [2020-11-28 07:38:12,288 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_af1d5482-cd30-4780-b87c-381c5eae11b0/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 07:38:12,336 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2020-11-28 07:38:12,336 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-11-28 07:38:12,337 INFO L263 TraceCheckSpWp]: Trace formula consists of 44 conjuncts, 3 conjunts are in the unsatisfiable core [2020-11-28 07:38:12,338 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-28 07:38:12,353 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2020-11-28 07:38:12,353 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-11-28 07:38:12,402 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2020-11-28 07:38:12,403 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [67472779] [2020-11-28 07:38:12,405 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2020-11-28 07:38:12,405 INFO L166 IcfgInterpreter]: Building call graph [2020-11-28 07:38:12,406 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-11-28 07:38:12,406 INFO L176 IcfgInterpreter]: Starting interpretation [2020-11-28 07:38:12,406 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-11-28 07:38:12,982 INFO L180 IcfgInterpreter]: Interpretation finished [2020-11-28 07:38:13,152 WARN L193 SmtUtils]: Spent 153.00 ms on a formula simplification. DAG size of input: 90 DAG size of output: 36 [2020-11-28 07:38:13,546 WARN L193 SmtUtils]: Spent 369.00 ms on a formula simplification. DAG size of input: 85 DAG size of output: 70 [2020-11-28 07:38:13,781 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 86 DAG size of output: 31 [2020-11-28 07:38:13,783 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-11-28 07:38:13,783 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-11-28 07:38:13,783 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 6 [2020-11-28 07:38:13,783 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1798003573] [2020-11-28 07:38:13,784 INFO L461 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-11-28 07:38:13,784 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-28 07:38:13,784 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-11-28 07:38:13,785 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=75, Unknown=0, NotChecked=0, Total=110 [2020-11-28 07:38:13,785 INFO L87 Difference]: Start difference. First operand 11 states and 12 transitions. Second operand 7 states. [2020-11-28 07:38:13,819 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-28 07:38:13,819 INFO L93 Difference]: Finished difference Result 32 states and 38 transitions. [2020-11-28 07:38:13,820 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-11-28 07:38:13,820 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 10 [2020-11-28 07:38:13,820 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-28 07:38:13,821 INFO L225 Difference]: With dead ends: 32 [2020-11-28 07:38:13,821 INFO L226 Difference]: Without dead ends: 29 [2020-11-28 07:38:13,822 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=35, Invalid=75, Unknown=0, NotChecked=0, Total=110 [2020-11-28 07:38:13,822 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2020-11-28 07:38:13,826 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2020-11-28 07:38:13,826 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-11-28 07:38:13,827 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 33 transitions. [2020-11-28 07:38:13,827 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 33 transitions. Word has length 10 [2020-11-28 07:38:13,831 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-28 07:38:13,831 INFO L481 AbstractCegarLoop]: Abstraction has 29 states and 33 transitions. [2020-11-28 07:38:13,831 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-11-28 07:38:13,831 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 33 transitions. [2020-11-28 07:38:13,832 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-11-28 07:38:13,833 INFO L414 BasicCegarLoop]: Found error trace [2020-11-28 07:38:13,833 INFO L422 BasicCegarLoop]: trace histogram [16, 4, 4, 1, 1, 1, 1] [2020-11-28 07:38:14,044 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable49 [2020-11-28 07:38:14,045 INFO L429 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-28 07:38:14,046 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 07:38:14,047 INFO L82 PathProgramCache]: Analyzing trace with hash -85948718, now seen corresponding path program 3 times [2020-11-28 07:38:14,047 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-28 07:38:14,047 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [694566634] [2020-11-28 07:38:14,048 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-28 07:38:14,088 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 07:38:14,144 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 79 proven. 10 refuted. 0 times theorem prover too weak. 111 trivial. 0 not checked. [2020-11-28 07:38:14,144 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [694566634] [2020-11-28 07:38:14,144 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1522067131] [2020-11-28 07:38:14,144 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_af1d5482-cd30-4780-b87c-381c5eae11b0/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 07:38:14,197 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-11-28 07:38:14,198 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-11-28 07:38:14,198 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 6 conjunts are in the unsatisfiable core [2020-11-28 07:38:14,201 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-28 07:38:14,222 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 79 proven. 10 refuted. 0 times theorem prover too weak. 111 trivial. 0 not checked. [2020-11-28 07:38:14,222 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-11-28 07:38:14,256 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 79 proven. 10 refuted. 0 times theorem prover too weak. 111 trivial. 0 not checked. [2020-11-28 07:38:14,256 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [170670493] [2020-11-28 07:38:14,259 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2020-11-28 07:38:14,259 INFO L166 IcfgInterpreter]: Building call graph [2020-11-28 07:38:14,259 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-11-28 07:38:14,259 INFO L176 IcfgInterpreter]: Starting interpretation [2020-11-28 07:38:14,260 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-11-28 07:38:14,778 INFO L180 IcfgInterpreter]: Interpretation finished [2020-11-28 07:38:14,975 WARN L193 SmtUtils]: Spent 171.00 ms on a formula simplification. DAG size of input: 90 DAG size of output: 36 [2020-11-28 07:38:15,423 WARN L193 SmtUtils]: Spent 417.00 ms on a formula simplification. DAG size of input: 85 DAG size of output: 70 [2020-11-28 07:38:15,714 WARN L193 SmtUtils]: Spent 145.00 ms on a formula simplification. DAG size of input: 86 DAG size of output: 31 [2020-11-28 07:38:15,715 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-11-28 07:38:15,715 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-11-28 07:38:15,716 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 9 [2020-11-28 07:38:15,716 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1207262314] [2020-11-28 07:38:15,716 INFO L461 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-11-28 07:38:15,717 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-28 07:38:15,717 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-11-28 07:38:15,718 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=106, Unknown=0, NotChecked=0, Total=156 [2020-11-28 07:38:15,718 INFO L87 Difference]: Start difference. First operand 29 states and 33 transitions. Second operand 9 states. [2020-11-28 07:38:15,760 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-28 07:38:15,760 INFO L93 Difference]: Finished difference Result 59 states and 74 transitions. [2020-11-28 07:38:15,761 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-11-28 07:38:15,761 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 28 [2020-11-28 07:38:15,761 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-28 07:38:15,762 INFO L225 Difference]: With dead ends: 59 [2020-11-28 07:38:15,762 INFO L226 Difference]: Without dead ends: 37 [2020-11-28 07:38:15,763 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 89 GetRequests, 77 SyntacticMatches, 1 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 41 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=50, Invalid=106, Unknown=0, NotChecked=0, Total=156 [2020-11-28 07:38:15,763 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-11-28 07:38:15,770 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2020-11-28 07:38:15,770 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-11-28 07:38:15,771 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 41 transitions. [2020-11-28 07:38:15,771 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 41 transitions. Word has length 28 [2020-11-28 07:38:15,772 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-28 07:38:15,772 INFO L481 AbstractCegarLoop]: Abstraction has 37 states and 41 transitions. [2020-11-28 07:38:15,772 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-11-28 07:38:15,772 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 41 transitions. [2020-11-28 07:38:15,776 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-11-28 07:38:15,776 INFO L414 BasicCegarLoop]: Found error trace [2020-11-28 07:38:15,776 INFO L422 BasicCegarLoop]: trace histogram [24, 4, 4, 1, 1, 1, 1] [2020-11-28 07:38:15,977 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable96,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-28 07:38:15,977 INFO L429 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-28 07:38:15,977 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 07:38:15,978 INFO L82 PathProgramCache]: Analyzing trace with hash -300676654, now seen corresponding path program 4 times [2020-11-28 07:38:15,978 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-28 07:38:15,978 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [254187032] [2020-11-28 07:38:15,978 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-28 07:38:16,022 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 07:38:16,110 INFO L134 CoverageAnalysis]: Checked inductivity of 388 backedges. 0 proven. 304 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2020-11-28 07:38:16,110 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [254187032] [2020-11-28 07:38:16,110 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1797643998] [2020-11-28 07:38:16,111 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_af1d5482-cd30-4780-b87c-381c5eae11b0/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 07:38:16,175 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 07:38:16,176 INFO L263 TraceCheckSpWp]: Trace formula consists of 134 conjuncts, 6 conjunts are in the unsatisfiable core [2020-11-28 07:38:16,180 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-28 07:38:16,208 INFO L134 CoverageAnalysis]: Checked inductivity of 388 backedges. 0 proven. 304 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2020-11-28 07:38:16,209 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-11-28 07:38:16,241 INFO L134 CoverageAnalysis]: Checked inductivity of 388 backedges. 0 proven. 304 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2020-11-28 07:38:16,245 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1039059311] [2020-11-28 07:38:16,248 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2020-11-28 07:38:16,248 INFO L166 IcfgInterpreter]: Building call graph [2020-11-28 07:38:16,249 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-11-28 07:38:16,249 INFO L176 IcfgInterpreter]: Starting interpretation [2020-11-28 07:38:16,250 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-11-28 07:38:16,664 INFO L180 IcfgInterpreter]: Interpretation finished [2020-11-28 07:38:16,853 WARN L193 SmtUtils]: Spent 166.00 ms on a formula simplification. DAG size of input: 90 DAG size of output: 36 [2020-11-28 07:38:17,263 WARN L193 SmtUtils]: Spent 380.00 ms on a formula simplification. DAG size of input: 85 DAG size of output: 70 [2020-11-28 07:38:17,546 WARN L193 SmtUtils]: Spent 140.00 ms on a formula simplification. DAG size of input: 86 DAG size of output: 31 [2020-11-28 07:38:17,547 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-11-28 07:38:17,548 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-11-28 07:38:17,548 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 8 [2020-11-28 07:38:17,548 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1323698193] [2020-11-28 07:38:17,548 INFO L461 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-11-28 07:38:17,549 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-28 07:38:17,549 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-11-28 07:38:17,549 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=106, Unknown=0, NotChecked=0, Total=156 [2020-11-28 07:38:17,549 INFO L87 Difference]: Start difference. First operand 37 states and 41 transitions. Second operand 9 states. [2020-11-28 07:38:17,593 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-28 07:38:17,594 INFO L93 Difference]: Finished difference Result 56 states and 63 transitions. [2020-11-28 07:38:17,595 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-11-28 07:38:17,595 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 36 [2020-11-28 07:38:17,595 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-28 07:38:17,596 INFO L225 Difference]: With dead ends: 56 [2020-11-28 07:38:17,596 INFO L226 Difference]: Without dead ends: 53 [2020-11-28 07:38:17,596 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 112 GetRequests, 100 SyntacticMatches, 1 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 41 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=50, Invalid=106, Unknown=0, NotChecked=0, Total=156 [2020-11-28 07:38:17,597 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-11-28 07:38:17,603 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 53. [2020-11-28 07:38:17,603 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2020-11-28 07:38:17,608 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 59 transitions. [2020-11-28 07:38:17,610 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 59 transitions. Word has length 36 [2020-11-28 07:38:17,610 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-28 07:38:17,610 INFO L481 AbstractCegarLoop]: Abstraction has 53 states and 59 transitions. [2020-11-28 07:38:17,611 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-11-28 07:38:17,611 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 59 transitions. [2020-11-28 07:38:17,612 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2020-11-28 07:38:17,613 INFO L414 BasicCegarLoop]: Found error trace [2020-11-28 07:38:17,613 INFO L422 BasicCegarLoop]: trace histogram [36, 6, 6, 1, 1, 1, 1] [2020-11-28 07:38:17,828 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable143,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-28 07:38:17,828 INFO L429 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-28 07:38:17,828 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 07:38:17,828 INFO L82 PathProgramCache]: Analyzing trace with hash -694183672, now seen corresponding path program 5 times [2020-11-28 07:38:17,829 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-28 07:38:17,829 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1035727136] [2020-11-28 07:38:17,829 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-28 07:38:17,881 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 07:38:18,174 INFO L134 CoverageAnalysis]: Checked inductivity of 882 backedges. 0 proven. 777 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2020-11-28 07:38:18,175 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1035727136] [2020-11-28 07:38:18,175 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1271280242] [2020-11-28 07:38:18,175 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_af1d5482-cd30-4780-b87c-381c5eae11b0/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 07:38:18,237 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2020-11-28 07:38:18,237 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-11-28 07:38:18,238 INFO L263 TraceCheckSpWp]: Trace formula consists of 86 conjuncts, 7 conjunts are in the unsatisfiable core [2020-11-28 07:38:18,243 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-28 07:38:18,310 INFO L134 CoverageAnalysis]: Checked inductivity of 882 backedges. 257 proven. 0 refuted. 0 times theorem prover too weak. 625 trivial. 0 not checked. [2020-11-28 07:38:18,310 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-11-28 07:38:18,417 INFO L134 CoverageAnalysis]: Checked inductivity of 882 backedges. 251 proven. 6 refuted. 0 times theorem prover too weak. 625 trivial. 0 not checked. [2020-11-28 07:38:18,417 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 2 imperfect interpolant sequences. [2020-11-28 07:38:18,417 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [16, 6] total 19 [2020-11-28 07:38:18,418 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [708543303] [2020-11-28 07:38:18,418 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-11-28 07:38:18,418 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-28 07:38:18,418 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-11-28 07:38:18,419 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=106, Invalid=236, Unknown=0, NotChecked=0, Total=342 [2020-11-28 07:38:18,419 INFO L87 Difference]: Start difference. First operand 53 states and 59 transitions. Second operand 6 states. [2020-11-28 07:38:18,470 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-28 07:38:18,470 INFO L93 Difference]: Finished difference Result 53 states and 59 transitions. [2020-11-28 07:38:18,471 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-11-28 07:38:18,471 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 52 [2020-11-28 07:38:18,471 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-28 07:38:18,472 INFO L225 Difference]: With dead ends: 53 [2020-11-28 07:38:18,472 INFO L226 Difference]: Without dead ends: 0 [2020-11-28 07:38:18,472 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 119 GetRequests, 96 SyntacticMatches, 5 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 163 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=113, Invalid=267, Unknown=0, NotChecked=0, Total=380 [2020-11-28 07:38:18,473 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-11-28 07:38:18,473 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-11-28 07:38:18,473 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-11-28 07:38:18,473 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-11-28 07:38:18,473 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 52 [2020-11-28 07:38:18,473 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-28 07:38:18,473 INFO L481 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-11-28 07:38:18,473 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-11-28 07:38:18,473 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-11-28 07:38:18,474 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-11-28 07:38:18,674 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable189 [2020-11-28 07:38:18,675 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-11-28 07:38:18,762 INFO L274 CegarLoopResult]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2020-11-28 07:38:18,762 INFO L277 CegarLoopResult]: At program point L25(lines 25 27) the Hoare annotation is: true [2020-11-28 07:38:18,762 INFO L270 CegarLoopResult]: At program point L21-3(lines 21 23) the Hoare annotation is: (and (<= ULTIMATE.start_main_~b~0 6) (<= ULTIMATE.start_main_~a~0 5)) [2020-11-28 07:38:18,762 INFO L274 CegarLoopResult]: For program point L13(line 13) no Hoare annotation was computed. [2020-11-28 07:38:18,762 INFO L274 CegarLoopResult]: For program point ULTIMATE.startENTRY(line -1) no Hoare annotation was computed. [2020-11-28 07:38:18,762 INFO L274 CegarLoopResult]: For program point ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION(line 13) no Hoare annotation was computed. [2020-11-28 07:38:18,762 INFO L270 CegarLoopResult]: At program point L20-3(lines 20 24) the Hoare annotation is: (and (<= ULTIMATE.start_main_~a~0 6) (<= ULTIMATE.start_main_~b~0 6) (< 5 ULTIMATE.start_main_~b~0)) [2020-11-28 07:38:18,763 INFO L274 CegarLoopResult]: For program point L20-4(lines 15 29) no Hoare annotation was computed. [2020-11-28 07:38:18,787 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 28.11 07:38:18 BoogieIcfgContainer [2020-11-28 07:38:18,787 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-11-28 07:38:18,788 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2020-11-28 07:38:18,788 INFO L271 PluginConnector]: Initializing Witness Printer... [2020-11-28 07:38:18,788 INFO L275 PluginConnector]: Witness Printer initialized [2020-11-28 07:38:18,789 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 28.11 07:38:09" (3/4) ... [2020-11-28 07:38:18,793 INFO L137 WitnessPrinter]: Generating witness for correct program [2020-11-28 07:38:18,801 INFO L902 BoogieBacktranslator]: Reduced CFG by removing 10 nodes and edges [2020-11-28 07:38:18,802 INFO L902 BoogieBacktranslator]: Reduced CFG by removing 6 nodes and edges [2020-11-28 07:38:18,802 INFO L902 BoogieBacktranslator]: Reduced CFG by removing 2 nodes and edges [2020-11-28 07:38:18,802 INFO L902 BoogieBacktranslator]: Reduced CFG by removing 1 nodes and edges [2020-11-28 07:38:18,847 INFO L141 WitnessManager]: Wrote witness to /tmp/vcloud-vcloud-master/worker/run_dir_af1d5482-cd30-4780-b87c-381c5eae11b0/bin/utaipan/witness.graphml [2020-11-28 07:38:18,847 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2020-11-28 07:38:18,848 INFO L168 Benchmark]: Toolchain (without parser) took 10317.70 ms. Allocated memory was 96.5 MB in the beginning and 155.2 MB in the end (delta: 58.7 MB). Free memory was 68.1 MB in the beginning and 58.6 MB in the end (delta: 9.6 MB). Peak memory consumption was 67.1 MB. Max. memory is 16.1 GB. [2020-11-28 07:38:18,848 INFO L168 Benchmark]: CDTParser took 0.25 ms. Allocated memory is still 96.5 MB. Free memory is still 53.3 MB. There was no memory consumed. Max. memory is 16.1 GB. [2020-11-28 07:38:18,848 INFO L168 Benchmark]: CACSL2BoogieTranslator took 299.55 ms. Allocated memory is still 96.5 MB. Free memory was 67.9 MB in the beginning and 74.0 MB in the end (delta: -6.1 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. [2020-11-28 07:38:18,849 INFO L168 Benchmark]: Boogie Procedure Inliner took 33.91 ms. Allocated memory is still 96.5 MB. Free memory was 74.0 MB in the beginning and 72.7 MB in the end (delta: 1.3 MB). There was no memory consumed. Max. memory is 16.1 GB. [2020-11-28 07:38:18,849 INFO L168 Benchmark]: Boogie Preprocessor took 23.45 ms. Allocated memory is still 96.5 MB. Free memory was 72.7 MB in the beginning and 71.9 MB in the end (delta: 812.6 kB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2020-11-28 07:38:18,850 INFO L168 Benchmark]: RCFGBuilder took 365.83 ms. Allocated memory is still 96.5 MB. Free memory was 71.6 MB in the beginning and 58.4 MB in the end (delta: 13.2 MB). Peak memory consumption was 12.6 MB. Max. memory is 16.1 GB. [2020-11-28 07:38:18,850 INFO L168 Benchmark]: TraceAbstraction took 9526.49 ms. Allocated memory was 96.5 MB in the beginning and 155.2 MB in the end (delta: 58.7 MB). Free memory was 58.0 MB in the beginning and 60.7 MB in the end (delta: -2.6 MB). Peak memory consumption was 57.7 MB. Max. memory is 16.1 GB. [2020-11-28 07:38:18,850 INFO L168 Benchmark]: Witness Printer took 58.82 ms. Allocated memory is still 155.2 MB. Free memory was 60.7 MB in the beginning and 58.6 MB in the end (delta: 2.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2020-11-28 07:38:18,853 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 96.5 MB. Free memory is still 53.3 MB. There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 299.55 ms. Allocated memory is still 96.5 MB. Free memory was 67.9 MB in the beginning and 74.0 MB in the end (delta: -6.1 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. * Boogie Procedure Inliner took 33.91 ms. Allocated memory is still 96.5 MB. Free memory was 74.0 MB in the beginning and 72.7 MB in the end (delta: 1.3 MB). There was no memory consumed. Max. memory is 16.1 GB. * Boogie Preprocessor took 23.45 ms. Allocated memory is still 96.5 MB. Free memory was 72.7 MB in the beginning and 71.9 MB in the end (delta: 812.6 kB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * RCFGBuilder took 365.83 ms. Allocated memory is still 96.5 MB. Free memory was 71.6 MB in the beginning and 58.4 MB in the end (delta: 13.2 MB). Peak memory consumption was 12.6 MB. Max. memory is 16.1 GB. * TraceAbstraction took 9526.49 ms. Allocated memory was 96.5 MB in the beginning and 155.2 MB in the end (delta: 58.7 MB). Free memory was 58.0 MB in the beginning and 60.7 MB in the end (delta: -2.6 MB). Peak memory consumption was 57.7 MB. Max. memory is 16.1 GB. * Witness Printer took 58.82 ms. Allocated memory is still 155.2 MB. Free memory was 60.7 MB in the beginning and 58.6 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: 20]: Loop Invariant Derived loop invariant: (a <= 6 && b <= 6) && 5 < b - InvariantResult [Line: 21]: Loop Invariant Derived loop invariant: b <= 6 && a <= 5 - InvariantResult [Line: 25]: Loop Invariant Derived loop invariant: 1 - StatisticsResult: Ultimate Automizer benchmark data CFG has 1 procedures, 8 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 9.3s, OverallIterations: 7, TraceHistogramMax: 36, AutomataDifference: 0.3s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 36 SDtfs, 27 SDslu, 34 SDs, 0 SdLazy, 93 SolverSat, 17 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.1s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 379 GetRequests, 312 SyntacticMatches, 7 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 305 ImplicationChecksByTransitivity, 4.0s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=53occurred in iteration=6, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 7 MinimizatonAttempts, 1 StatesRemovedByMinimization, 1 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 3 LocationsWithAnnotation, 3 PreInvPairs, 53 NumberOfFragments, 18 HoareAnnotationTreeSize, 3 FomulaSimplifications, 655 FormulaSimplificationTreeSizeReduction, 0.0s HoareSimplificationTime, 3 FomulaSimplificationsInter, 51 FormulaSimplificationTreeSizeReductionInter, 0.0s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.3s SatisfiabilityAnalysisTime, 1.0s InterpolantComputationTime, 276 NumberOfCodeBlocks, 239 NumberOfCodeBlocksAsserted, 21 NumberOfCheckSat, 392 ConstructedInterpolants, 0 QuantifiedInterpolants, 34241 SizeOfPredicates, 8 NumberOfNonLiveVariables, 388 ConjunctsInSsa, 25 ConjunctsInUnsatCore, 17 InterpolantComputations, 3 PerfectInterpolantSequences, 2719/4450 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...