./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 f470102c Calling Ultimate with: /usr/lib/jvm/java-8-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud-vcloud-master/worker/run_dir_2b737997-986e-425b-b030-cc89017f0911/bin/utaipan/data/config -Xmx12G -Xms1G -jar /tmp/vcloud-vcloud-master/worker/run_dir_2b737997-986e-425b-b030-cc89017f0911/bin/utaipan/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/run_dir_2b737997-986e-425b-b030-cc89017f0911/bin/utaipan/data -tc /tmp/vcloud-vcloud-master/worker/run_dir_2b737997-986e-425b-b030-cc89017f0911/bin/utaipan/config/TaipanReach.xml -i ../../sv-benchmarks/c/recursive-simple/id2_i5_o5-1.c -s /tmp/vcloud-vcloud-master/worker/run_dir_2b737997-986e-425b-b030-cc89017f0911/bin/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/run_dir_2b737997-986e-425b-b030-cc89017f0911/bin/utaipan --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 Taipan --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 0.1.25-f470102 [2019-12-07 21:47:40,373 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-12-07 21:47:40,374 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-12-07 21:47:40,382 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-12-07 21:47:40,382 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-12-07 21:47:40,383 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-12-07 21:47:40,384 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-12-07 21:47:40,386 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-12-07 21:47:40,388 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-12-07 21:47:40,388 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-12-07 21:47:40,389 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-12-07 21:47:40,390 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-12-07 21:47:40,390 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-12-07 21:47:40,391 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-12-07 21:47:40,392 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-12-07 21:47:40,392 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-12-07 21:47:40,393 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-12-07 21:47:40,394 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-12-07 21:47:40,395 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-12-07 21:47:40,396 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-12-07 21:47:40,397 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-12-07 21:47:40,398 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-12-07 21:47:40,399 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-12-07 21:47:40,399 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-12-07 21:47:40,401 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2019-12-07 21:47:40,401 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2019-12-07 21:47:40,401 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2019-12-07 21:47:40,401 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2019-12-07 21:47:40,402 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2019-12-07 21:47:40,402 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2019-12-07 21:47:40,402 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2019-12-07 21:47:40,403 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2019-12-07 21:47:40,403 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2019-12-07 21:47:40,404 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2019-12-07 21:47:40,404 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2019-12-07 21:47:40,404 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2019-12-07 21:47:40,405 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2019-12-07 21:47:40,405 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2019-12-07 21:47:40,405 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-12-07 21:47:40,405 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-12-07 21:47:40,406 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-12-07 21:47:40,406 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud-vcloud-master/worker/run_dir_2b737997-986e-425b-b030-cc89017f0911/bin/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf [2019-12-07 21:47:40,416 INFO L113 SettingsManager]: Loading preferences was successful [2019-12-07 21:47:40,416 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-12-07 21:47:40,417 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2019-12-07 21:47:40,417 INFO L138 SettingsManager]: * User list type=DISABLED [2019-12-07 21:47:40,417 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2019-12-07 21:47:40,417 INFO L138 SettingsManager]: * Explicit value domain=true [2019-12-07 21:47:40,417 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2019-12-07 21:47:40,417 INFO L138 SettingsManager]: * Octagon Domain=false [2019-12-07 21:47:40,418 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2019-12-07 21:47:40,418 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2019-12-07 21:47:40,418 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2019-12-07 21:47:40,418 INFO L138 SettingsManager]: * Interval Domain=false [2019-12-07 21:47:40,418 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2019-12-07 21:47:40,418 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2019-12-07 21:47:40,418 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2019-12-07 21:47:40,419 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-12-07 21:47:40,419 INFO L138 SettingsManager]: * sizeof long=4 [2019-12-07 21:47:40,419 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-12-07 21:47:40,419 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-12-07 21:47:40,419 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-12-07 21:47:40,419 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-12-07 21:47:40,420 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-12-07 21:47:40,420 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-12-07 21:47:40,420 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2019-12-07 21:47:40,420 INFO L138 SettingsManager]: * sizeof long double=12 [2019-12-07 21:47:40,420 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-12-07 21:47:40,420 INFO L138 SettingsManager]: * Use constant arrays=true [2019-12-07 21:47:40,420 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-12-07 21:47:40,420 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-12-07 21:47:40,421 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-12-07 21:47:40,421 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-12-07 21:47:40,421 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-12-07 21:47:40,421 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-12-07 21:47:40,421 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-12-07 21:47:40,421 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-12-07 21:47:40,421 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2019-12-07 21:47:40,421 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-12-07 21:47:40,422 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-12-07 21:47:40,422 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2019-12-07 21:47:40,422 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-12-07 21:47:40,422 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES 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_2b737997-986e-425b-b030-cc89017f0911/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(__VERIFIER_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 -> 59c5766d3cddc0d41e2678bb5221cccc60217431 [2019-12-07 21:47:40,521 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-12-07 21:47:40,528 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-12-07 21:47:40,530 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-12-07 21:47:40,531 INFO L271 PluginConnector]: Initializing CDTParser... [2019-12-07 21:47:40,532 INFO L275 PluginConnector]: CDTParser initialized [2019-12-07 21:47:40,532 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/run_dir_2b737997-986e-425b-b030-cc89017f0911/bin/utaipan/../../sv-benchmarks/c/recursive-simple/id2_i5_o5-1.c [2019-12-07 21:47:40,568 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_2b737997-986e-425b-b030-cc89017f0911/bin/utaipan/data/f0e391fc6/574405b6669e44f2a49f7aa67be3ed76/FLAG9e761e44d [2019-12-07 21:47:40,971 INFO L306 CDTParser]: Found 1 translation units. [2019-12-07 21:47:40,972 INFO L160 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/run_dir_2b737997-986e-425b-b030-cc89017f0911/sv-benchmarks/c/recursive-simple/id2_i5_o5-1.c [2019-12-07 21:47:40,975 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_2b737997-986e-425b-b030-cc89017f0911/bin/utaipan/data/f0e391fc6/574405b6669e44f2a49f7aa67be3ed76/FLAG9e761e44d [2019-12-07 21:47:40,984 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/run_dir_2b737997-986e-425b-b030-cc89017f0911/bin/utaipan/data/f0e391fc6/574405b6669e44f2a49f7aa67be3ed76 [2019-12-07 21:47:40,986 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-12-07 21:47:40,987 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2019-12-07 21:47:40,987 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-12-07 21:47:40,987 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-12-07 21:47:40,989 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-12-07 21:47:40,990 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.12 09:47:40" (1/1) ... [2019-12-07 21:47:40,992 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@605e252b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 09:47:40, skipping insertion in model container [2019-12-07 21:47:40,992 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.12 09:47:40" (1/1) ... [2019-12-07 21:47:40,996 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2019-12-07 21:47:41,006 INFO L178 MainTranslator]: Built tables and reachable declarations [2019-12-07 21:47:41,101 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-12-07 21:47:41,103 INFO L203 MainTranslator]: Completed pre-run [2019-12-07 21:47:41,147 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-12-07 21:47:41,156 INFO L208 MainTranslator]: Completed translation [2019-12-07 21:47:41,157 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 09:47:41 WrapperNode [2019-12-07 21:47:41,157 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-12-07 21:47:41,157 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2019-12-07 21:47:41,157 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2019-12-07 21:47:41,157 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2019-12-07 21:47:41,163 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 09:47:41" (1/1) ... [2019-12-07 21:47:41,167 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 09:47:41" (1/1) ... [2019-12-07 21:47:41,177 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2019-12-07 21:47:41,177 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-12-07 21:47:41,177 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-12-07 21:47:41,177 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-12-07 21:47:41,183 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 09:47:41" (1/1) ... [2019-12-07 21:47:41,183 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 09:47:41" (1/1) ... [2019-12-07 21:47:41,184 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 09:47:41" (1/1) ... [2019-12-07 21:47:41,184 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 09:47:41" (1/1) ... [2019-12-07 21:47:41,185 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 09:47:41" (1/1) ... [2019-12-07 21:47:41,186 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 09:47:41" (1/1) ... [2019-12-07 21:47:41,186 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 09:47:41" (1/1) ... [2019-12-07 21:47:41,187 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-12-07 21:47:41,187 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-12-07 21:47:41,188 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-12-07 21:47:41,188 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-12-07 21:47:41,188 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 09:47:41" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_2b737997-986e-425b-b030-cc89017f0911/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 [2019-12-07 21:47:41,226 INFO L130 BoogieDeclarations]: Found specification of procedure id2 [2019-12-07 21:47:41,226 INFO L138 BoogieDeclarations]: Found implementation of procedure id2 [2019-12-07 21:47:41,227 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-12-07 21:47:41,227 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-12-07 21:47:41,227 INFO L130 BoogieDeclarations]: Found specification of procedure id [2019-12-07 21:47:41,227 INFO L138 BoogieDeclarations]: Found implementation of procedure id [2019-12-07 21:47:41,327 INFO L282 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-12-07 21:47:41,327 INFO L287 CfgBuilder]: Removed 4 assume(true) statements. [2019-12-07 21:47:41,328 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.12 09:47:41 BoogieIcfgContainer [2019-12-07 21:47:41,328 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-12-07 21:47:41,328 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-12-07 21:47:41,328 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-12-07 21:47:41,330 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-12-07 21:47:41,330 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 07.12 09:47:40" (1/3) ... [2019-12-07 21:47:41,331 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3799c08a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.12 09:47:41, skipping insertion in model container [2019-12-07 21:47:41,331 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 09:47:41" (2/3) ... [2019-12-07 21:47:41,331 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3799c08a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.12 09:47:41, skipping insertion in model container [2019-12-07 21:47:41,331 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.12 09:47:41" (3/3) ... [2019-12-07 21:47:41,332 INFO L109 eAbstractionObserver]: Analyzing ICFG id2_i5_o5-1.c [2019-12-07 21:47:41,339 INFO L156 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-12-07 21:47:41,343 INFO L168 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-12-07 21:47:41,350 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-12-07 21:47:41,365 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-12-07 21:47:41,365 INFO L374 AbstractCegarLoop]: Hoare is true [2019-12-07 21:47:41,365 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-12-07 21:47:41,365 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-12-07 21:47:41,365 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-12-07 21:47:41,365 INFO L378 AbstractCegarLoop]: Difference is false [2019-12-07 21:47:41,365 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-12-07 21:47:41,365 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-12-07 21:47:41,376 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states. [2019-12-07 21:47:41,379 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2019-12-07 21:47:41,379 INFO L402 BasicCegarLoop]: Found error trace [2019-12-07 21:47:41,380 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-12-07 21:47:41,380 INFO L410 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-12-07 21:47:41,384 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-12-07 21:47:41,384 INFO L82 PathProgramCache]: Analyzing trace with hash 2105267373, now seen corresponding path program 1 times [2019-12-07 21:47:41,389 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-12-07 21:47:41,390 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1907454946] [2019-12-07 21:47:41,390 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-12-07 21:47:41,447 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 21:47:41,515 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-12-07 21:47:41,515 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1907454946] [2019-12-07 21:47:41,516 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-12-07 21:47:41,516 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2019-12-07 21:47:41,517 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [520805939] [2019-12-07 21:47:41,520 INFO L442 AbstractCegarLoop]: Interpolant automaton has 7 states [2019-12-07 21:47:41,520 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-12-07 21:47:41,528 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2019-12-07 21:47:41,529 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2019-12-07 21:47:41,530 INFO L87 Difference]: Start difference. First operand 20 states. Second operand 7 states. [2019-12-07 21:47:41,612 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-12-07 21:47:41,612 INFO L93 Difference]: Finished difference Result 30 states and 33 transitions. [2019-12-07 21:47:41,613 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-12-07 21:47:41,614 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 9 [2019-12-07 21:47:41,615 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-12-07 21:47:41,622 INFO L225 Difference]: With dead ends: 30 [2019-12-07 21:47:41,623 INFO L226 Difference]: Without dead ends: 20 [2019-12-07 21:47:41,625 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2019-12-07 21:47:41,636 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2019-12-07 21:47:41,650 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2019-12-07 21:47:41,650 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2019-12-07 21:47:41,651 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 22 transitions. [2019-12-07 21:47:41,652 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 22 transitions. Word has length 9 [2019-12-07 21:47:41,652 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-12-07 21:47:41,652 INFO L462 AbstractCegarLoop]: Abstraction has 20 states and 22 transitions. [2019-12-07 21:47:41,652 INFO L463 AbstractCegarLoop]: Interpolant automaton has 7 states. [2019-12-07 21:47:41,652 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 22 transitions. [2019-12-07 21:47:41,653 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2019-12-07 21:47:41,653 INFO L402 BasicCegarLoop]: Found error trace [2019-12-07 21:47:41,653 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-12-07 21:47:41,654 INFO L410 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-12-07 21:47:41,654 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-12-07 21:47:41,654 INFO L82 PathProgramCache]: Analyzing trace with hash -131148366, now seen corresponding path program 1 times [2019-12-07 21:47:41,654 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-12-07 21:47:41,654 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1664706331] [2019-12-07 21:47:41,654 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-12-07 21:47:41,662 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 21:47:41,724 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-12-07 21:47:41,725 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1664706331] [2019-12-07 21:47:41,725 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-12-07 21:47:41,725 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2019-12-07 21:47:41,725 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [227742841] [2019-12-07 21:47:41,726 INFO L442 AbstractCegarLoop]: Interpolant automaton has 10 states [2019-12-07 21:47:41,726 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-12-07 21:47:41,726 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2019-12-07 21:47:41,727 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=73, Unknown=0, NotChecked=0, Total=90 [2019-12-07 21:47:41,727 INFO L87 Difference]: Start difference. First operand 20 states and 22 transitions. Second operand 10 states. [2019-12-07 21:47:41,830 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-12-07 21:47:41,830 INFO L93 Difference]: Finished difference Result 29 states and 31 transitions. [2019-12-07 21:47:41,830 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2019-12-07 21:47:41,830 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 15 [2019-12-07 21:47:41,831 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-12-07 21:47:41,831 INFO L225 Difference]: With dead ends: 29 [2019-12-07 21:47:41,831 INFO L226 Difference]: Without dead ends: 25 [2019-12-07 21:47:41,832 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=37, Invalid=173, Unknown=0, NotChecked=0, Total=210 [2019-12-07 21:47:41,832 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2019-12-07 21:47:41,835 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 23. [2019-12-07 21:47:41,836 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2019-12-07 21:47:41,836 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 25 transitions. [2019-12-07 21:47:41,836 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 25 transitions. Word has length 15 [2019-12-07 21:47:41,836 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-12-07 21:47:41,837 INFO L462 AbstractCegarLoop]: Abstraction has 23 states and 25 transitions. [2019-12-07 21:47:41,837 INFO L463 AbstractCegarLoop]: Interpolant automaton has 10 states. [2019-12-07 21:47:41,837 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 25 transitions. [2019-12-07 21:47:41,837 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2019-12-07 21:47:41,837 INFO L402 BasicCegarLoop]: Found error trace [2019-12-07 21:47:41,837 INFO L410 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-12-07 21:47:41,838 INFO L410 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-12-07 21:47:41,838 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-12-07 21:47:41,838 INFO L82 PathProgramCache]: Analyzing trace with hash -132605643, now seen corresponding path program 1 times [2019-12-07 21:47:41,838 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-12-07 21:47:41,838 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1728076015] [2019-12-07 21:47:41,838 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-12-07 21:47:41,846 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 21:47:41,925 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-12-07 21:47:41,925 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1728076015] [2019-12-07 21:47:41,925 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [266535580] [2019-12-07 21:47:41,925 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_2b737997-986e-425b-b030-cc89017f0911/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 [2019-12-07 21:47:41,946 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 21:47:41,948 INFO L264 TraceCheckSpWp]: Trace formula consists of 52 conjuncts, 8 conjunts are in the unsatisfiable core [2019-12-07 21:47:41,951 INFO L287 TraceCheckSpWp]: Computing forward predicates... [2019-12-07 21:47:42,013 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-12-07 21:47:42,013 INFO L329 TraceCheckSpWp]: Computing backward predicates... [2019-12-07 21:47:42,180 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-12-07 21:47:42,224 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-12-07 21:47:42,250 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-12-07 21:47:42,251 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1681664485] [2019-12-07 21:47:42,266 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2019-12-07 21:47:42,266 INFO L166 IcfgInterpreter]: Building call graph [2019-12-07 21:47:42,270 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:297) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:190) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:180) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:75) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:463) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterateInternal(AbstractCegarLoop.java:419) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:368) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopResult.iterate(CegarLoopResult.java:139) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.iterateNew(TraceAbstractionStarter.java:332) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:174) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:126) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:120) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:316) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:55) [2019-12-07 21:47:42,271 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-12-07 21:47:42,271 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 8, 9] total 19 [2019-12-07 21:47:42,271 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1054626139] [2019-12-07 21:47:42,272 INFO L442 AbstractCegarLoop]: Interpolant automaton has 19 states [2019-12-07 21:47:42,272 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-12-07 21:47:42,272 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2019-12-07 21:47:42,272 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=297, Unknown=0, NotChecked=0, Total=342 [2019-12-07 21:47:42,272 INFO L87 Difference]: Start difference. First operand 23 states and 25 transitions. Second operand 19 states. [2019-12-07 21:47:42,400 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-12-07 21:47:42,400 INFO L93 Difference]: Finished difference Result 35 states and 37 transitions. [2019-12-07 21:47:42,400 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2019-12-07 21:47:42,400 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 21 [2019-12-07 21:47:42,400 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-12-07 21:47:42,401 INFO L225 Difference]: With dead ends: 35 [2019-12-07 21:47:42,401 INFO L226 Difference]: Without dead ends: 31 [2019-12-07 21:47:42,402 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 30 SyntacticMatches, 6 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 39 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=81, Invalid=471, Unknown=0, NotChecked=0, Total=552 [2019-12-07 21:47:42,402 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2019-12-07 21:47:42,405 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 26. [2019-12-07 21:47:42,405 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2019-12-07 21:47:42,406 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 28 transitions. [2019-12-07 21:47:42,406 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 28 transitions. Word has length 21 [2019-12-07 21:47:42,406 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-12-07 21:47:42,407 INFO L462 AbstractCegarLoop]: Abstraction has 26 states and 28 transitions. [2019-12-07 21:47:42,407 INFO L463 AbstractCegarLoop]: Interpolant automaton has 19 states. [2019-12-07 21:47:42,407 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 28 transitions. [2019-12-07 21:47:42,407 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2019-12-07 21:47:42,407 INFO L402 BasicCegarLoop]: Found error trace [2019-12-07 21:47:42,408 INFO L410 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-12-07 21:47:42,608 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-12-07 21:47:42,609 INFO L410 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-12-07 21:47:42,610 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-12-07 21:47:42,610 INFO L82 PathProgramCache]: Analyzing trace with hash -614490246, now seen corresponding path program 1 times [2019-12-07 21:47:42,611 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-12-07 21:47:42,611 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [217191754] [2019-12-07 21:47:42,612 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-12-07 21:47:42,643 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 21:47:42,740 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2019-12-07 21:47:42,740 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [217191754] [2019-12-07 21:47:42,740 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1022513099] [2019-12-07 21:47:42,740 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_2b737997-986e-425b-b030-cc89017f0911/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 [2019-12-07 21:47:42,761 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 21:47:42,762 INFO L264 TraceCheckSpWp]: Trace formula consists of 66 conjuncts, 10 conjunts are in the unsatisfiable core [2019-12-07 21:47:42,764 INFO L287 TraceCheckSpWp]: Computing forward predicates... [2019-12-07 21:47:42,816 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2019-12-07 21:47:42,816 INFO L329 TraceCheckSpWp]: Computing backward predicates... [2019-12-07 21:47:43,155 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-12-07 21:47:43,155 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [547569531] [2019-12-07 21:47:43,156 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2019-12-07 21:47:43,157 INFO L166 IcfgInterpreter]: Building call graph [2019-12-07 21:47:43,157 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:297) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:190) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:180) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:75) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:463) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterateInternal(AbstractCegarLoop.java:419) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:368) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopResult.iterate(CegarLoopResult.java:139) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.iterateNew(TraceAbstractionStarter.java:332) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:174) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:126) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:120) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:316) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:55) [2019-12-07 21:47:43,157 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-12-07 21:47:43,157 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 9, 11] total 23 [2019-12-07 21:47:43,157 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1148981494] [2019-12-07 21:47:43,158 INFO L442 AbstractCegarLoop]: Interpolant automaton has 23 states [2019-12-07 21:47:43,158 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-12-07 21:47:43,158 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2019-12-07 21:47:43,159 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=447, Unknown=0, NotChecked=0, Total=506 [2019-12-07 21:47:43,159 INFO L87 Difference]: Start difference. First operand 26 states and 28 transitions. Second operand 23 states. [2019-12-07 21:47:43,313 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-12-07 21:47:43,313 INFO L93 Difference]: Finished difference Result 41 states and 43 transitions. [2019-12-07 21:47:43,313 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2019-12-07 21:47:43,314 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 27 [2019-12-07 21:47:43,314 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-12-07 21:47:43,314 INFO L225 Difference]: With dead ends: 41 [2019-12-07 21:47:43,315 INFO L226 Difference]: Without dead ends: 37 [2019-12-07 21:47:43,315 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 39 SyntacticMatches, 8 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 103 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=117, Invalid=753, Unknown=0, NotChecked=0, Total=870 [2019-12-07 21:47:43,315 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2019-12-07 21:47:43,318 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 29. [2019-12-07 21:47:43,318 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2019-12-07 21:47:43,319 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 31 transitions. [2019-12-07 21:47:43,319 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 31 transitions. Word has length 27 [2019-12-07 21:47:43,319 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-12-07 21:47:43,319 INFO L462 AbstractCegarLoop]: Abstraction has 29 states and 31 transitions. [2019-12-07 21:47:43,319 INFO L463 AbstractCegarLoop]: Interpolant automaton has 23 states. [2019-12-07 21:47:43,320 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 31 transitions. [2019-12-07 21:47:43,320 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2019-12-07 21:47:43,320 INFO L402 BasicCegarLoop]: Found error trace [2019-12-07 21:47:43,321 INFO L410 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2019-12-07 21:47:43,521 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-12-07 21:47:43,522 INFO L410 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-12-07 21:47:43,523 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-12-07 21:47:43,523 INFO L82 PathProgramCache]: Analyzing trace with hash -2127867459, now seen corresponding path program 2 times [2019-12-07 21:47:43,523 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-12-07 21:47:43,524 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2092251502] [2019-12-07 21:47:43,524 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-12-07 21:47:43,556 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 21:47:43,671 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2019-12-07 21:47:43,671 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2092251502] [2019-12-07 21:47:43,671 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1663462375] [2019-12-07 21:47:43,671 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_2b737997-986e-425b-b030-cc89017f0911/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 [2019-12-07 21:47:43,695 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2019-12-07 21:47:43,695 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-12-07 21:47:43,696 INFO L264 TraceCheckSpWp]: Trace formula consists of 80 conjuncts, 12 conjunts are in the unsatisfiable core [2019-12-07 21:47:43,697 INFO L287 TraceCheckSpWp]: Computing forward predicates... [2019-12-07 21:47:43,837 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2019-12-07 21:47:43,837 INFO L329 TraceCheckSpWp]: Computing backward predicates... [2019-12-07 21:47:44,250 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2019-12-07 21:47:44,250 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1692383833] [2019-12-07 21:47:44,251 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2019-12-07 21:47:44,252 INFO L166 IcfgInterpreter]: Building call graph [2019-12-07 21:47:44,252 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:297) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:190) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:180) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:75) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:463) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterateInternal(AbstractCegarLoop.java:419) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:368) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopResult.iterate(CegarLoopResult.java:139) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.iterateNew(TraceAbstractionStarter.java:332) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:174) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:126) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:120) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:316) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:55) [2019-12-07 21:47:44,252 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-12-07 21:47:44,252 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 13, 13] total 27 [2019-12-07 21:47:44,252 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1342608045] [2019-12-07 21:47:44,253 INFO L442 AbstractCegarLoop]: Interpolant automaton has 27 states [2019-12-07 21:47:44,253 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-12-07 21:47:44,253 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2019-12-07 21:47:44,253 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=637, Unknown=0, NotChecked=0, Total=702 [2019-12-07 21:47:44,253 INFO L87 Difference]: Start difference. First operand 29 states and 31 transitions. Second operand 27 states. [2019-12-07 21:47:44,470 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-12-07 21:47:44,470 INFO L93 Difference]: Finished difference Result 47 states and 49 transitions. [2019-12-07 21:47:44,470 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2019-12-07 21:47:44,470 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 33 [2019-12-07 21:47:44,471 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-12-07 21:47:44,471 INFO L225 Difference]: With dead ends: 47 [2019-12-07 21:47:44,471 INFO L226 Difference]: Without dead ends: 43 [2019-12-07 21:47:44,472 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 47 SyntacticMatches, 11 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 267 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=138, Invalid=1268, Unknown=0, NotChecked=0, Total=1406 [2019-12-07 21:47:44,473 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2019-12-07 21:47:44,477 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 32. [2019-12-07 21:47:44,477 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2019-12-07 21:47:44,478 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 34 transitions. [2019-12-07 21:47:44,478 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 34 transitions. Word has length 33 [2019-12-07 21:47:44,478 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-12-07 21:47:44,478 INFO L462 AbstractCegarLoop]: Abstraction has 32 states and 34 transitions. [2019-12-07 21:47:44,478 INFO L463 AbstractCegarLoop]: Interpolant automaton has 27 states. [2019-12-07 21:47:44,478 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 34 transitions. [2019-12-07 21:47:44,479 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2019-12-07 21:47:44,479 INFO L402 BasicCegarLoop]: Found error trace [2019-12-07 21:47:44,479 INFO L410 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2019-12-07 21:47:44,680 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-12-07 21:47:44,681 INFO L410 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-12-07 21:47:44,681 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-12-07 21:47:44,682 INFO L82 PathProgramCache]: Analyzing trace with hash -1002836670, now seen corresponding path program 2 times [2019-12-07 21:47:44,682 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-12-07 21:47:44,683 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [347345900] [2019-12-07 21:47:44,683 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-12-07 21:47:44,721 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2019-12-07 21:47:44,735 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2019-12-07 21:47:44,747 INFO L174 FreeRefinementEngine]: Strategy SIFA_TAIPAN found a feasible trace [2019-12-07 21:47:44,747 INFO L475 BasicCegarLoop]: Counterexample might be feasible [2019-12-07 21:47:44,764 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 07.12 09:47:44 BoogieIcfgContainer [2019-12-07 21:47:44,764 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2019-12-07 21:47:44,765 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2019-12-07 21:47:44,765 INFO L271 PluginConnector]: Initializing Witness Printer... [2019-12-07 21:47:44,765 INFO L275 PluginConnector]: Witness Printer initialized [2019-12-07 21:47:44,765 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.12 09:47:41" (3/4) ... [2019-12-07 21:47:44,766 INFO L131 WitnessPrinter]: Generating witness for reachability counterexample [2019-12-07 21:47:44,797 INFO L141 WitnessManager]: Wrote witness to /tmp/vcloud-vcloud-master/worker/run_dir_2b737997-986e-425b-b030-cc89017f0911/bin/utaipan/witness.graphml [2019-12-07 21:47:44,797 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2019-12-07 21:47:44,799 INFO L168 Benchmark]: Toolchain (without parser) took 3811.83 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 144.2 MB). Free memory was 950.0 MB in the beginning and 1.0 GB in the end (delta: -90.2 MB). Peak memory consumption was 54.0 MB. Max. memory is 11.5 GB. [2019-12-07 21:47:44,799 INFO L168 Benchmark]: CDTParser took 0.12 ms. Allocated memory is still 1.0 GB. Free memory is still 963.9 MB. There was no memory consumed. Max. memory is 11.5 GB. [2019-12-07 21:47:44,800 INFO L168 Benchmark]: CACSL2BoogieTranslator took 169.58 ms. Allocated memory was 1.0 GB in the beginning and 1.1 GB in the end (delta: 103.3 MB). Free memory was 950.0 MB in the beginning and 1.1 GB in the end (delta: -150.9 MB). Peak memory consumption was 23.0 MB. Max. memory is 11.5 GB. [2019-12-07 21:47:44,800 INFO L168 Benchmark]: Boogie Procedure Inliner took 20.05 ms. Allocated memory is still 1.1 GB. Free memory is still 1.1 GB. There was no memory consumed. Max. memory is 11.5 GB. [2019-12-07 21:47:44,800 INFO L168 Benchmark]: Boogie Preprocessor took 10.05 ms. Allocated memory is still 1.1 GB. Free memory is still 1.1 GB. There was no memory consumed. Max. memory is 11.5 GB. [2019-12-07 21:47:44,800 INFO L168 Benchmark]: RCFGBuilder took 140.22 ms. Allocated memory is still 1.1 GB. Free memory was 1.1 GB in the beginning and 1.1 GB in the end (delta: 19.7 MB). Peak memory consumption was 19.7 MB. Max. memory is 11.5 GB. [2019-12-07 21:47:44,801 INFO L168 Benchmark]: TraceAbstraction took 3436.21 ms. Allocated memory was 1.1 GB in the beginning and 1.2 GB in the end (delta: 40.9 MB). Free memory was 1.1 GB in the beginning and 1.0 GB in the end (delta: 32.9 MB). Peak memory consumption was 73.7 MB. Max. memory is 11.5 GB. [2019-12-07 21:47:44,801 INFO L168 Benchmark]: Witness Printer took 32.83 ms. Allocated memory is still 1.2 GB. Free memory was 1.0 GB in the beginning and 1.0 GB in the end (delta: 8.1 MB). Peak memory consumption was 8.1 MB. Max. memory is 11.5 GB. [2019-12-07 21:47:44,802 INFO L335 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.12 ms. Allocated memory is still 1.0 GB. Free memory is still 963.9 MB. There was no memory consumed. Max. memory is 11.5 GB. * CACSL2BoogieTranslator took 169.58 ms. Allocated memory was 1.0 GB in the beginning and 1.1 GB in the end (delta: 103.3 MB). Free memory was 950.0 MB in the beginning and 1.1 GB in the end (delta: -150.9 MB). Peak memory consumption was 23.0 MB. Max. memory is 11.5 GB. * Boogie Procedure Inliner took 20.05 ms. Allocated memory is still 1.1 GB. Free memory is still 1.1 GB. There was no memory consumed. Max. memory is 11.5 GB. * Boogie Preprocessor took 10.05 ms. Allocated memory is still 1.1 GB. Free memory is still 1.1 GB. There was no memory consumed. Max. memory is 11.5 GB. * RCFGBuilder took 140.22 ms. Allocated memory is still 1.1 GB. Free memory was 1.1 GB in the beginning and 1.1 GB in the end (delta: 19.7 MB). Peak memory consumption was 19.7 MB. Max. memory is 11.5 GB. * TraceAbstraction took 3436.21 ms. Allocated memory was 1.1 GB in the beginning and 1.2 GB in the end (delta: 40.9 MB). Free memory was 1.1 GB in the beginning and 1.0 GB in the end (delta: 32.9 MB). Peak memory consumption was 73.7 MB. Max. memory is 11.5 GB. * Witness Printer took 32.83 ms. Allocated memory is still 1.2 GB. Free memory was 1.0 GB in the beginning and 1.0 GB in the end (delta: 8.1 MB). Peak memory consumption was 8.1 MB. 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, 20 locations, 1 error locations. Result: UNSAFE, OverallTime: 3.3s, OverallIterations: 6, TraceHistogramMax: 3, AutomataDifference: 0.7s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, HoareTripleCheckerStatistics: 59 SDtfs, 93 SDslu, 534 SDs, 0 SdLazy, 654 SolverSat, 50 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.2s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 252 GetRequests, 120 SyntacticMatches, 25 SemanticMatches, 107 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 422 ImplicationChecksByTransitivity, 1.1s 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, 1.6s InterpolantComputationTime, 225 NumberOfCodeBlocks, 225 NumberOfCodeBlocksAsserted, 11 NumberOfCheckSat, 256 ConstructedInterpolants, 0 QuantifiedInterpolants, 18760 SizeOfPredicates, 10 NumberOfNonLiveVariables, 198 ConjunctsInSsa, 30 ConjunctsInUnsatCore, 11 InterpolantComputations, 2 PerfectInterpolantSequences, 47/102 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...