./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/recursive-simple/id2_i5_o5-1.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 678e0110 Calling Ultimate with: /usr/lib/jvm/java-8-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud-vcloud-master/worker/run_dir_bdf1e47e-98bd-470b-823f-853aba9f4176/bin/uautomizer/data/config -Xmx12G -Xms1G -jar /tmp/vcloud-vcloud-master/worker/run_dir_bdf1e47e-98bd-470b-823f-853aba9f4176/bin/uautomizer/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/run_dir_bdf1e47e-98bd-470b-823f-853aba9f4176/bin/uautomizer/data -tc /tmp/vcloud-vcloud-master/worker/run_dir_bdf1e47e-98bd-470b-823f-853aba9f4176/bin/uautomizer/config/AutomizerReach.xml -i ../../sv-benchmarks/c/recursive-simple/id2_i5_o5-1.c -s /tmp/vcloud-vcloud-master/worker/run_dir_bdf1e47e-98bd-470b-823f-853aba9f4176/bin/uautomizer/config/svcomp-Reach-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/run_dir_bdf1e47e-98bd-470b-823f-853aba9f4176/bin/uautomizer --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(__VERIFIER_error())) ) --witnessprinter.graph.data.producer Automizer --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 59c5766d3cddc0d41e2678bb5221cccc60217431 .......................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... Execution finished normally Writing output log to file Ultimate.log Writing human readable error path to file UltimateCounterExample.errorpath Result: FALSE --- Real Ultimate output --- This is Ultimate 0.1.24-678e011 [2019-11-20 10:39:08,285 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-11-20 10:39:08,287 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-11-20 10:39:08,297 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-11-20 10:39:08,297 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-11-20 10:39:08,298 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-11-20 10:39:08,300 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-11-20 10:39:08,302 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-11-20 10:39:08,303 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-11-20 10:39:08,304 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-11-20 10:39:08,305 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-11-20 10:39:08,306 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-11-20 10:39:08,307 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-11-20 10:39:08,308 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-11-20 10:39:08,308 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-11-20 10:39:08,310 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-11-20 10:39:08,310 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-11-20 10:39:08,311 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-11-20 10:39:08,313 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-11-20 10:39:08,315 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-11-20 10:39:08,316 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-11-20 10:39:08,317 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-11-20 10:39:08,319 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-11-20 10:39:08,319 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-11-20 10:39:08,322 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2019-11-20 10:39:08,322 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2019-11-20 10:39:08,323 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2019-11-20 10:39:08,324 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2019-11-20 10:39:08,324 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2019-11-20 10:39:08,325 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2019-11-20 10:39:08,325 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2019-11-20 10:39:08,326 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2019-11-20 10:39:08,327 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2019-11-20 10:39:08,328 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2019-11-20 10:39:08,329 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2019-11-20 10:39:08,329 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2019-11-20 10:39:08,330 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2019-11-20 10:39:08,330 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2019-11-20 10:39:08,330 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-11-20 10:39:08,331 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-11-20 10:39:08,332 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-11-20 10:39:08,332 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud-vcloud-master/worker/run_dir_bdf1e47e-98bd-470b-823f-853aba9f4176/bin/uautomizer/config/svcomp-Reach-32bit-Automizer_Default.epf [2019-11-20 10:39:08,345 INFO L113 SettingsManager]: Loading preferences was successful [2019-11-20 10:39:08,345 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-11-20 10:39:08,346 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-11-20 10:39:08,346 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-11-20 10:39:08,347 INFO L138 SettingsManager]: * Use SBE=true [2019-11-20 10:39:08,347 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-11-20 10:39:08,347 INFO L138 SettingsManager]: * sizeof long=4 [2019-11-20 10:39:08,347 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-11-20 10:39:08,347 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-11-20 10:39:08,348 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-11-20 10:39:08,348 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-11-20 10:39:08,348 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-11-20 10:39:08,348 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-11-20 10:39:08,349 INFO L138 SettingsManager]: * sizeof long double=12 [2019-11-20 10:39:08,349 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-11-20 10:39:08,349 INFO L138 SettingsManager]: * Use constant arrays=true [2019-11-20 10:39:08,349 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-11-20 10:39:08,349 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-11-20 10:39:08,350 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-11-20 10:39:08,350 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-11-20 10:39:08,350 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-11-20 10:39:08,350 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-11-20 10:39:08,351 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-11-20 10:39:08,351 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-11-20 10:39:08,351 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-11-20 10:39:08,351 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-11-20 10:39:08,351 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-11-20 10:39:08,352 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-11-20 10:39:08,352 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode 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_bdf1e47e-98bd-470b-823f-853aba9f4176/bin/uautomizer 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(__VERIFIER_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer 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 -> 59c5766d3cddc0d41e2678bb5221cccc60217431 [2019-11-20 10:39:08,486 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-11-20 10:39:08,496 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-11-20 10:39:08,500 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-11-20 10:39:08,501 INFO L271 PluginConnector]: Initializing CDTParser... [2019-11-20 10:39:08,501 INFO L275 PluginConnector]: CDTParser initialized [2019-11-20 10:39:08,502 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/run_dir_bdf1e47e-98bd-470b-823f-853aba9f4176/bin/uautomizer/../../sv-benchmarks/c/recursive-simple/id2_i5_o5-1.c [2019-11-20 10:39:08,550 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_bdf1e47e-98bd-470b-823f-853aba9f4176/bin/uautomizer/data/511161fee/e651d535dfb044df95fc4dd35d7e600a/FLAGa7229ab29 [2019-11-20 10:39:08,925 INFO L306 CDTParser]: Found 1 translation units. [2019-11-20 10:39:08,925 INFO L160 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/run_dir_bdf1e47e-98bd-470b-823f-853aba9f4176/sv-benchmarks/c/recursive-simple/id2_i5_o5-1.c [2019-11-20 10:39:08,930 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_bdf1e47e-98bd-470b-823f-853aba9f4176/bin/uautomizer/data/511161fee/e651d535dfb044df95fc4dd35d7e600a/FLAGa7229ab29 [2019-11-20 10:39:08,941 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/run_dir_bdf1e47e-98bd-470b-823f-853aba9f4176/bin/uautomizer/data/511161fee/e651d535dfb044df95fc4dd35d7e600a [2019-11-20 10:39:08,944 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-11-20 10:39:08,945 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2019-11-20 10:39:08,946 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-11-20 10:39:08,946 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-11-20 10:39:08,949 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-11-20 10:39:08,950 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.11 10:39:08" (1/1) ... [2019-11-20 10:39:08,952 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@617984fb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 10:39:08, skipping insertion in model container [2019-11-20 10:39:08,952 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.11 10:39:08" (1/1) ... [2019-11-20 10:39:08,959 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-11-20 10:39:08,971 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-11-20 10:39:09,089 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-20 10:39:09,092 INFO L188 MainTranslator]: Completed pre-run [2019-11-20 10:39:09,170 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-20 10:39:09,187 INFO L192 MainTranslator]: Completed translation [2019-11-20 10:39:09,187 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 10:39:09 WrapperNode [2019-11-20 10:39:09,188 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-11-20 10:39:09,189 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2019-11-20 10:39:09,189 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2019-11-20 10:39:09,189 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2019-11-20 10:39:09,197 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 10:39:09" (1/1) ... [2019-11-20 10:39:09,202 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 10:39:09" (1/1) ... [2019-11-20 10:39:09,220 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2019-11-20 10:39:09,221 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-11-20 10:39:09,222 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-11-20 10:39:09,222 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-11-20 10:39:09,230 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 10:39:09" (1/1) ... [2019-11-20 10:39:09,230 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 10:39:09" (1/1) ... [2019-11-20 10:39:09,231 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 10:39:09" (1/1) ... [2019-11-20 10:39:09,231 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 10:39:09" (1/1) ... [2019-11-20 10:39:09,235 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 10:39:09" (1/1) ... [2019-11-20 10:39:09,238 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 10:39:09" (1/1) ... [2019-11-20 10:39:09,239 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 10:39:09" (1/1) ... [2019-11-20 10:39:09,244 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-11-20 10:39:09,244 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-11-20 10:39:09,245 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-11-20 10:39:09,245 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-11-20 10:39:09,246 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 10:39:09" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_bdf1e47e-98bd-470b-823f-853aba9f4176/bin/uautomizer/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 [2019-11-20 10:39:09,325 INFO L130 BoogieDeclarations]: Found specification of procedure id2 [2019-11-20 10:39:09,326 INFO L138 BoogieDeclarations]: Found implementation of procedure id2 [2019-11-20 10:39:09,326 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-11-20 10:39:09,326 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-11-20 10:39:09,327 INFO L130 BoogieDeclarations]: Found specification of procedure id [2019-11-20 10:39:09,327 INFO L138 BoogieDeclarations]: Found implementation of procedure id [2019-11-20 10:39:09,513 INFO L280 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-11-20 10:39:09,513 INFO L285 CfgBuilder]: Removed 4 assume(true) statements. [2019-11-20 10:39:09,514 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.11 10:39:09 BoogieIcfgContainer [2019-11-20 10:39:09,514 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-11-20 10:39:09,515 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-11-20 10:39:09,516 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-11-20 10:39:09,519 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-11-20 10:39:09,519 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.11 10:39:08" (1/3) ... [2019-11-20 10:39:09,520 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@66421b6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.11 10:39:09, skipping insertion in model container [2019-11-20 10:39:09,520 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 10:39:09" (2/3) ... [2019-11-20 10:39:09,520 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@66421b6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.11 10:39:09, skipping insertion in model container [2019-11-20 10:39:09,521 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.11 10:39:09" (3/3) ... [2019-11-20 10:39:09,522 INFO L109 eAbstractionObserver]: Analyzing ICFG id2_i5_o5-1.c [2019-11-20 10:39:09,547 INFO L153 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-11-20 10:39:09,552 INFO L165 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-11-20 10:39:09,576 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-11-20 10:39:09,603 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-11-20 10:39:09,603 INFO L374 AbstractCegarLoop]: Hoare is true [2019-11-20 10:39:09,604 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-11-20 10:39:09,606 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-11-20 10:39:09,606 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-11-20 10:39:09,606 INFO L378 AbstractCegarLoop]: Difference is false [2019-11-20 10:39:09,606 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-11-20 10:39:09,606 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-11-20 10:39:09,627 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states. [2019-11-20 10:39:09,632 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2019-11-20 10:39:09,632 INFO L402 BasicCegarLoop]: Found error trace [2019-11-20 10:39:09,633 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-20 10:39:09,633 INFO L410 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-20 10:39:09,638 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-20 10:39:09,639 INFO L82 PathProgramCache]: Analyzing trace with hash 2105267373, now seen corresponding path program 1 times [2019-11-20 10:39:09,647 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-20 10:39:09,647 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [646129828] [2019-11-20 10:39:09,647 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-20 10:39:09,741 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-20 10:39:09,842 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-20 10:39:09,876 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-20 10:39:09,877 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [646129828] [2019-11-20 10:39:09,878 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-20 10:39:09,878 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2019-11-20 10:39:09,879 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [760169654] [2019-11-20 10:39:09,883 INFO L442 AbstractCegarLoop]: Interpolant automaton has 7 states [2019-11-20 10:39:09,884 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-20 10:39:09,896 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2019-11-20 10:39:09,897 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2019-11-20 10:39:09,899 INFO L87 Difference]: Start difference. First operand 21 states. Second operand 7 states. [2019-11-20 10:39:10,019 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-20 10:39:10,019 INFO L93 Difference]: Finished difference Result 30 states and 34 transitions. [2019-11-20 10:39:10,021 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-11-20 10:39:10,022 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 9 [2019-11-20 10:39:10,022 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-20 10:39:10,031 INFO L225 Difference]: With dead ends: 30 [2019-11-20 10:39:10,031 INFO L226 Difference]: Without dead ends: 20 [2019-11-20 10:39:10,034 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2019-11-20 10:39:10,046 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2019-11-20 10:39:10,064 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2019-11-20 10:39:10,066 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2019-11-20 10:39:10,067 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 22 transitions. [2019-11-20 10:39:10,068 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 22 transitions. Word has length 9 [2019-11-20 10:39:10,068 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-20 10:39:10,068 INFO L462 AbstractCegarLoop]: Abstraction has 20 states and 22 transitions. [2019-11-20 10:39:10,069 INFO L463 AbstractCegarLoop]: Interpolant automaton has 7 states. [2019-11-20 10:39:10,069 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 22 transitions. [2019-11-20 10:39:10,070 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2019-11-20 10:39:10,070 INFO L402 BasicCegarLoop]: Found error trace [2019-11-20 10:39:10,071 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-20 10:39:10,071 INFO L410 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-20 10:39:10,071 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-20 10:39:10,072 INFO L82 PathProgramCache]: Analyzing trace with hash -131148366, now seen corresponding path program 1 times [2019-11-20 10:39:10,072 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-20 10:39:10,072 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1565550074] [2019-11-20 10:39:10,072 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-20 10:39:10,082 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-20 10:39:10,114 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-20 10:39:10,159 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-20 10:39:10,208 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-20 10:39:10,208 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1565550074] [2019-11-20 10:39:10,209 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-20 10:39:10,209 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2019-11-20 10:39:10,209 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [178332424] [2019-11-20 10:39:10,210 INFO L442 AbstractCegarLoop]: Interpolant automaton has 9 states [2019-11-20 10:39:10,210 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-20 10:39:10,211 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2019-11-20 10:39:10,211 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2019-11-20 10:39:10,211 INFO L87 Difference]: Start difference. First operand 20 states and 22 transitions. Second operand 9 states. [2019-11-20 10:39:10,316 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-20 10:39:10,316 INFO L93 Difference]: Finished difference Result 29 states and 31 transitions. [2019-11-20 10:39:10,317 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-11-20 10:39:10,317 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 15 [2019-11-20 10:39:10,318 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-20 10:39:10,318 INFO L225 Difference]: With dead ends: 29 [2019-11-20 10:39:10,318 INFO L226 Difference]: Without dead ends: 25 [2019-11-20 10:39:10,319 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=87, Unknown=0, NotChecked=0, Total=110 [2019-11-20 10:39:10,320 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2019-11-20 10:39:10,324 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 23. [2019-11-20 10:39:10,324 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2019-11-20 10:39:10,325 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 25 transitions. [2019-11-20 10:39:10,325 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 25 transitions. Word has length 15 [2019-11-20 10:39:10,325 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-20 10:39:10,325 INFO L462 AbstractCegarLoop]: Abstraction has 23 states and 25 transitions. [2019-11-20 10:39:10,325 INFO L463 AbstractCegarLoop]: Interpolant automaton has 9 states. [2019-11-20 10:39:10,326 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 25 transitions. [2019-11-20 10:39:10,326 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2019-11-20 10:39:10,326 INFO L402 BasicCegarLoop]: Found error trace [2019-11-20 10:39:10,326 INFO L410 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-20 10:39:10,327 INFO L410 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-20 10:39:10,327 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-20 10:39:10,327 INFO L82 PathProgramCache]: Analyzing trace with hash -132605643, now seen corresponding path program 1 times [2019-11-20 10:39:10,330 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-20 10:39:10,330 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1626815874] [2019-11-20 10:39:10,330 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-20 10:39:10,350 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-20 10:39:10,414 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-20 10:39:10,468 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-20 10:39:10,505 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-20 10:39:10,523 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-11-20 10:39:10,524 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1626815874] [2019-11-20 10:39:10,524 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1796779858] [2019-11-20 10:39:10,524 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_bdf1e47e-98bd-470b-823f-853aba9f4176/bin/uautomizer/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 [2019-11-20 10:39:10,573 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-20 10:39:10,575 INFO L255 TraceCheckSpWp]: Trace formula consists of 52 conjuncts, 8 conjunts are in the unsatisfiable core [2019-11-20 10:39:10,582 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-20 10:39:10,664 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-11-20 10:39:10,665 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-20 10:39:10,665 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 8] total 13 [2019-11-20 10:39:10,666 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1851698525] [2019-11-20 10:39:10,666 INFO L442 AbstractCegarLoop]: Interpolant automaton has 13 states [2019-11-20 10:39:10,666 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-20 10:39:10,667 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2019-11-20 10:39:10,667 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=128, Unknown=0, NotChecked=0, Total=156 [2019-11-20 10:39:10,667 INFO L87 Difference]: Start difference. First operand 23 states and 25 transitions. Second operand 13 states. [2019-11-20 10:39:10,777 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-20 10:39:10,777 INFO L93 Difference]: Finished difference Result 35 states and 37 transitions. [2019-11-20 10:39:10,778 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2019-11-20 10:39:10,778 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 21 [2019-11-20 10:39:10,778 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-20 10:39:10,779 INFO L225 Difference]: With dead ends: 35 [2019-11-20 10:39:10,779 INFO L226 Difference]: Without dead ends: 31 [2019-11-20 10:39:10,780 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=46, Invalid=194, Unknown=0, NotChecked=0, Total=240 [2019-11-20 10:39:10,780 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2019-11-20 10:39:10,784 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 26. [2019-11-20 10:39:10,784 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2019-11-20 10:39:10,785 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 28 transitions. [2019-11-20 10:39:10,785 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 28 transitions. Word has length 21 [2019-11-20 10:39:10,786 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-20 10:39:10,786 INFO L462 AbstractCegarLoop]: Abstraction has 26 states and 28 transitions. [2019-11-20 10:39:10,786 INFO L463 AbstractCegarLoop]: Interpolant automaton has 13 states. [2019-11-20 10:39:10,786 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 28 transitions. [2019-11-20 10:39:10,787 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2019-11-20 10:39:10,787 INFO L402 BasicCegarLoop]: Found error trace [2019-11-20 10:39:10,787 INFO L410 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-20 10:39:10,993 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-20 10:39:10,993 INFO L410 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-20 10:39:10,993 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-20 10:39:10,993 INFO L82 PathProgramCache]: Analyzing trace with hash -614490246, now seen corresponding path program 1 times [2019-11-20 10:39:10,993 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-20 10:39:10,994 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1279057118] [2019-11-20 10:39:10,994 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-20 10:39:11,024 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-20 10:39:11,070 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-20 10:39:11,112 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-20 10:39:11,147 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-20 10:39:11,173 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-20 10:39:11,204 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2019-11-20 10:39:11,205 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1279057118] [2019-11-20 10:39:11,205 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1770613913] [2019-11-20 10:39:11,205 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_bdf1e47e-98bd-470b-823f-853aba9f4176/bin/uautomizer/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 [2019-11-20 10:39:11,246 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-20 10:39:11,247 INFO L255 TraceCheckSpWp]: Trace formula consists of 66 conjuncts, 10 conjunts are in the unsatisfiable core [2019-11-20 10:39:11,249 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-20 10:39:11,308 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2019-11-20 10:39:11,309 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-20 10:39:11,309 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 9] total 14 [2019-11-20 10:39:11,309 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [745904327] [2019-11-20 10:39:11,310 INFO L442 AbstractCegarLoop]: Interpolant automaton has 14 states [2019-11-20 10:39:11,310 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-20 10:39:11,310 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2019-11-20 10:39:11,310 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=151, Unknown=0, NotChecked=0, Total=182 [2019-11-20 10:39:11,311 INFO L87 Difference]: Start difference. First operand 26 states and 28 transitions. Second operand 14 states. [2019-11-20 10:39:11,476 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-20 10:39:11,476 INFO L93 Difference]: Finished difference Result 41 states and 43 transitions. [2019-11-20 10:39:11,476 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2019-11-20 10:39:11,476 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 27 [2019-11-20 10:39:11,477 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-20 10:39:11,478 INFO L225 Difference]: With dead ends: 41 [2019-11-20 10:39:11,478 INFO L226 Difference]: Without dead ends: 37 [2019-11-20 10:39:11,478 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=56, Invalid=250, Unknown=0, NotChecked=0, Total=306 [2019-11-20 10:39:11,479 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2019-11-20 10:39:11,483 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 29. [2019-11-20 10:39:11,483 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2019-11-20 10:39:11,484 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 31 transitions. [2019-11-20 10:39:11,485 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 31 transitions. Word has length 27 [2019-11-20 10:39:11,485 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-20 10:39:11,493 INFO L462 AbstractCegarLoop]: Abstraction has 29 states and 31 transitions. [2019-11-20 10:39:11,494 INFO L463 AbstractCegarLoop]: Interpolant automaton has 14 states. [2019-11-20 10:39:11,505 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 31 transitions. [2019-11-20 10:39:11,506 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2019-11-20 10:39:11,507 INFO L402 BasicCegarLoop]: Found error trace [2019-11-20 10:39:11,507 INFO L410 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2019-11-20 10:39:11,707 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-20 10:39:11,708 INFO L410 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-20 10:39:11,708 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-20 10:39:11,708 INFO L82 PathProgramCache]: Analyzing trace with hash -2127867459, now seen corresponding path program 2 times [2019-11-20 10:39:11,708 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-20 10:39:11,708 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2086904797] [2019-11-20 10:39:11,709 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-20 10:39:11,720 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-20 10:39:11,759 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-20 10:39:11,805 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-20 10:39:11,858 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-20 10:39:11,885 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-20 10:39:11,913 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-20 10:39:11,942 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2019-11-20 10:39:11,943 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2086904797] [2019-11-20 10:39:11,943 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [146167926] [2019-11-20 10:39:11,943 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_bdf1e47e-98bd-470b-823f-853aba9f4176/bin/uautomizer/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 [2019-11-20 10:39:11,991 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-11-20 10:39:11,992 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-20 10:39:11,993 INFO L255 TraceCheckSpWp]: Trace formula consists of 80 conjuncts, 12 conjunts are in the unsatisfiable core [2019-11-20 10:39:11,999 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-20 10:39:12,056 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2019-11-20 10:39:12,056 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-20 10:39:12,057 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 10] total 15 [2019-11-20 10:39:12,057 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [217239038] [2019-11-20 10:39:12,057 INFO L442 AbstractCegarLoop]: Interpolant automaton has 15 states [2019-11-20 10:39:12,058 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-20 10:39:12,058 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2019-11-20 10:39:12,058 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=174, Unknown=0, NotChecked=0, Total=210 [2019-11-20 10:39:12,058 INFO L87 Difference]: Start difference. First operand 29 states and 31 transitions. Second operand 15 states. [2019-11-20 10:39:12,212 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-20 10:39:12,212 INFO L93 Difference]: Finished difference Result 47 states and 49 transitions. [2019-11-20 10:39:12,212 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2019-11-20 10:39:12,213 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 33 [2019-11-20 10:39:12,213 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-20 10:39:12,214 INFO L225 Difference]: With dead ends: 47 [2019-11-20 10:39:12,214 INFO L226 Difference]: Without dead ends: 43 [2019-11-20 10:39:12,215 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 38 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=70, Invalid=310, Unknown=0, NotChecked=0, Total=380 [2019-11-20 10:39:12,215 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2019-11-20 10:39:12,220 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 32. [2019-11-20 10:39:12,221 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2019-11-20 10:39:12,222 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 34 transitions. [2019-11-20 10:39:12,222 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 34 transitions. Word has length 33 [2019-11-20 10:39:12,223 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-20 10:39:12,223 INFO L462 AbstractCegarLoop]: Abstraction has 32 states and 34 transitions. [2019-11-20 10:39:12,223 INFO L463 AbstractCegarLoop]: Interpolant automaton has 15 states. [2019-11-20 10:39:12,223 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 34 transitions. [2019-11-20 10:39:12,224 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2019-11-20 10:39:12,224 INFO L402 BasicCegarLoop]: Found error trace [2019-11-20 10:39:12,224 INFO L410 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2019-11-20 10:39:12,425 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-20 10:39:12,425 INFO L410 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-20 10:39:12,425 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-20 10:39:12,425 INFO L82 PathProgramCache]: Analyzing trace with hash -1002836670, now seen corresponding path program 2 times [2019-11-20 10:39:12,426 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-20 10:39:12,426 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [628320808] [2019-11-20 10:39:12,426 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-20 10:39:12,436 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2019-11-20 10:39:12,446 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2019-11-20 10:39:12,467 INFO L174 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2019-11-20 10:39:12,467 INFO L475 BasicCegarLoop]: Counterexample might be feasible [2019-11-20 10:39:12,506 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 20.11 10:39:12 BoogieIcfgContainer [2019-11-20 10:39:12,506 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2019-11-20 10:39:12,506 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2019-11-20 10:39:12,507 INFO L271 PluginConnector]: Initializing Witness Printer... [2019-11-20 10:39:12,507 INFO L275 PluginConnector]: Witness Printer initialized [2019-11-20 10:39:12,507 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.11 10:39:09" (3/4) ... [2019-11-20 10:39:12,511 INFO L131 WitnessPrinter]: Generating witness for reachability counterexample [2019-11-20 10:39:12,576 INFO L141 WitnessManager]: Wrote witness to /tmp/vcloud-vcloud-master/worker/run_dir_bdf1e47e-98bd-470b-823f-853aba9f4176/bin/uautomizer/witness.graphml [2019-11-20 10:39:12,576 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2019-11-20 10:39:12,578 INFO L168 Benchmark]: Toolchain (without parser) took 3632.43 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 126.4 MB). Free memory was 951.4 MB in the beginning and 871.7 MB in the end (delta: 79.7 MB). Peak memory consumption was 206.1 MB. Max. memory is 11.5 GB. [2019-11-20 10:39:12,579 INFO L168 Benchmark]: CDTParser took 0.22 ms. Allocated memory is still 1.0 GB. Free memory is still 967.5 MB. There was no memory consumed. Max. memory is 11.5 GB. [2019-11-20 10:39:12,579 INFO L168 Benchmark]: CACSL2BoogieTranslator took 242.20 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 126.4 MB). Free memory was 951.4 MB in the beginning and 1.1 GB in the end (delta: -165.0 MB). Peak memory consumption was 24.6 MB. Max. memory is 11.5 GB. [2019-11-20 10:39:12,584 INFO L168 Benchmark]: Boogie Procedure Inliner took 32.78 ms. Allocated memory is still 1.2 GB. Free memory is still 1.1 GB. There was no memory consumed. Max. memory is 11.5 GB. [2019-11-20 10:39:12,584 INFO L168 Benchmark]: Boogie Preprocessor took 22.65 ms. Allocated memory is still 1.2 GB. Free memory is still 1.1 GB. There was no memory consumed. Max. memory is 11.5 GB. [2019-11-20 10:39:12,584 INFO L168 Benchmark]: RCFGBuilder took 270.24 ms. Allocated memory is still 1.2 GB. Free memory was 1.1 GB in the beginning and 1.1 GB in the end (delta: 15.7 MB). Peak memory consumption was 15.7 MB. Max. memory is 11.5 GB. [2019-11-20 10:39:12,585 INFO L168 Benchmark]: TraceAbstraction took 2990.72 ms. Allocated memory is still 1.2 GB. Free memory was 1.1 GB in the beginning and 871.7 MB in the end (delta: 229.0 MB). Peak memory consumption was 229.0 MB. Max. memory is 11.5 GB. [2019-11-20 10:39:12,585 INFO L168 Benchmark]: Witness Printer took 69.53 ms. Allocated memory is still 1.2 GB. Free memory is still 871.7 MB. There was no memory consumed. Max. memory is 11.5 GB. [2019-11-20 10:39:12,587 INFO L335 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.22 ms. Allocated memory is still 1.0 GB. Free memory is still 967.5 MB. There was no memory consumed. Max. memory is 11.5 GB. * CACSL2BoogieTranslator took 242.20 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 126.4 MB). Free memory was 951.4 MB in the beginning and 1.1 GB in the end (delta: -165.0 MB). Peak memory consumption was 24.6 MB. Max. memory is 11.5 GB. * Boogie Procedure Inliner took 32.78 ms. Allocated memory is still 1.2 GB. Free memory is still 1.1 GB. There was no memory consumed. Max. memory is 11.5 GB. * Boogie Preprocessor took 22.65 ms. Allocated memory is still 1.2 GB. Free memory is still 1.1 GB. There was no memory consumed. Max. memory is 11.5 GB. * RCFGBuilder took 270.24 ms. Allocated memory is still 1.2 GB. Free memory was 1.1 GB in the beginning and 1.1 GB in the end (delta: 15.7 MB). Peak memory consumption was 15.7 MB. Max. memory is 11.5 GB. * TraceAbstraction took 2990.72 ms. Allocated memory is still 1.2 GB. Free memory was 1.1 GB in the beginning and 871.7 MB in the end (delta: 229.0 MB). Peak memory consumption was 229.0 MB. Max. memory is 11.5 GB. * Witness Printer took 69.53 ms. Allocated memory is still 1.2 GB. Free memory is still 871.7 MB. There was no memory consumed. Max. memory is 11.5 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 21]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L18] int input = 5; [L19] CALL, EXPR id(input) VAL [\old(x)=5] [L8] COND FALSE !(x==0) VAL [\old(x)=5, x=5] [L9] CALL, EXPR id2(x-1) VAL [\old(x)=4] [L13] COND FALSE !(x==0) VAL [\old(x)=4, x=4] [L14] CALL, EXPR id(x-1) VAL [\old(x)=3] [L8] COND FALSE !(x==0) VAL [\old(x)=3, x=3] [L9] CALL, EXPR id2(x-1) VAL [\old(x)=2] [L13] COND FALSE !(x==0) VAL [\old(x)=2, x=2] [L14] CALL, EXPR id(x-1) VAL [\old(x)=1] [L8] COND FALSE !(x==0) VAL [\old(x)=1, x=1] [L9] CALL, EXPR id2(x-1) VAL [\old(x)=0] [L13] COND TRUE x==0 [L13] return 0; VAL [\old(x)=0, \result=0, x=0] [L9] RET, EXPR id2(x-1) VAL [\old(x)=1, id2(x-1)=0, x=1] [L9] return id2(x-1) + 1; [L14] RET, EXPR id(x-1) VAL [\old(x)=2, id(x-1)=1, x=2] [L14] return id(x-1) + 1; [L9] RET, EXPR id2(x-1) VAL [\old(x)=3, id2(x-1)=2, x=3] [L9] return id2(x-1) + 1; [L14] RET, EXPR id(x-1) VAL [\old(x)=4, id(x-1)=3, x=4] [L14] return id(x-1) + 1; [L9] RET, EXPR id2(x-1) VAL [\old(x)=5, id2(x-1)=4, x=5] [L9] return id2(x-1) + 1; [L19] RET, EXPR id(input) [L19] int result = id(input); [L20] COND TRUE result == 5 [L21] __VERIFIER_error() - StatisticsResult: Ultimate Automizer benchmark data CFG has 3 procedures, 21 locations, 1 error locations. Result: UNSAFE, OverallTime: 2.9s, OverallIterations: 6, TraceHistogramMax: 3, AutomataDifference: 0.6s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, HoareTripleCheckerStatistics: 71 SDtfs, 103 SDslu, 398 SDs, 0 SdLazy, 317 SolverSat, 26 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.3s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 158 GetRequests, 95 SyntacticMatches, 0 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 65 ImplicationChecksByTransitivity, 0.8s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=32occurred in iteration=5, 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, 5 MinimizatonAttempts, 26 StatesRemovedByMinimization, 4 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.1s SatisfiabilityAnalysisTime, 1.0s InterpolantComputationTime, 225 NumberOfCodeBlocks, 225 NumberOfCodeBlocksAsserted, 10 NumberOfCheckSat, 178 ConstructedInterpolants, 0 QuantifiedInterpolants, 11512 SizeOfPredicates, 15 NumberOfNonLiveVariables, 198 ConjunctsInSsa, 30 ConjunctsInUnsatCore, 8 InterpolantComputations, 2 PerfectInterpolantSequences, 34/68 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! Received shutdown request...