./Ultimate.py --spec ../../sv-benchmarks/c/properties/no-overflow.prp --file ../../sv-benchmarks/c/termination-numeric/TwoWay.c --full-output --architecture 64bit -------------------------------------------------------------------------------- Checking for overflows Using default analysis Version 7b2dab56 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud-vcloud-master/worker/run_dir_b81789ae-e79e-4241-9a98-4ef47fd188d6/bin/utaipan/data/config -Xmx15G -Xms4m -jar /tmp/vcloud-vcloud-master/worker/run_dir_b81789ae-e79e-4241-9a98-4ef47fd188d6/bin/utaipan/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/run_dir_b81789ae-e79e-4241-9a98-4ef47fd188d6/bin/utaipan/data -tc /tmp/vcloud-vcloud-master/worker/run_dir_b81789ae-e79e-4241-9a98-4ef47fd188d6/bin/utaipan/config/TaipanReach.xml -i ../../sv-benchmarks/c/termination-numeric/TwoWay.c -s /tmp/vcloud-vcloud-master/worker/run_dir_b81789ae-e79e-4241-9a98-4ef47fd188d6/bin/utaipan/config/svcomp-Overflow-64bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/run_dir_b81789ae-e79e-4241-9a98-4ef47fd188d6/bin/utaipan --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! overflow) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 64bit --witnessprinter.graph.data.programhash dd635190a9aa277670265f46b90ecce0c321a2a9 .......................................................................................................................................................................................................................................................................................................................................................................................................................................................................... Execution finished normally Using bit-precise analysis No suitable file found in config dir /tmp/vcloud-vcloud-master/worker/run_dir_b81789ae-e79e-4241-9a98-4ef47fd188d6/bin/utaipan/config using search string *Overflow*64bit*_Bitvector*.epf No suitable settings file found using Overflow*64bit*_Bitvector ERROR: UNSUPPORTED PROPERTY Writing output log to file Ultimate.log Result: UNKNOWN --- Real Ultimate output --- This is Ultimate 0.2.0-7b2dab5 [2020-12-09 10:15:32,201 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-12-09 10:15:32,202 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-12-09 10:15:32,223 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-12-09 10:15:32,224 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-12-09 10:15:32,225 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-12-09 10:15:32,226 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-12-09 10:15:32,228 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-12-09 10:15:32,230 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-12-09 10:15:32,231 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-12-09 10:15:32,232 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-12-09 10:15:32,233 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-12-09 10:15:32,233 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-12-09 10:15:32,234 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-12-09 10:15:32,235 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-12-09 10:15:32,236 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-12-09 10:15:32,237 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-12-09 10:15:32,238 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-12-09 10:15:32,239 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-12-09 10:15:32,241 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-12-09 10:15:32,243 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-12-09 10:15:32,244 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-12-09 10:15:32,245 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-12-09 10:15:32,246 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-12-09 10:15:32,248 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-12-09 10:15:32,249 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-12-09 10:15:32,249 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-12-09 10:15:32,249 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-12-09 10:15:32,250 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-12-09 10:15:32,251 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-12-09 10:15:32,251 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-12-09 10:15:32,252 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-12-09 10:15:32,252 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-12-09 10:15:32,253 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-12-09 10:15:32,254 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-12-09 10:15:32,254 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-12-09 10:15:32,254 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-12-09 10:15:32,254 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-12-09 10:15:32,254 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-12-09 10:15:32,255 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-12-09 10:15:32,255 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-12-09 10:15:32,256 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud-vcloud-master/worker/run_dir_b81789ae-e79e-4241-9a98-4ef47fd188d6/bin/utaipan/config/svcomp-Overflow-64bit-Taipan_Default.epf [2020-12-09 10:15:32,272 INFO L113 SettingsManager]: Loading preferences was successful [2020-12-09 10:15:32,272 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-12-09 10:15:32,272 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2020-12-09 10:15:32,273 INFO L138 SettingsManager]: * User list type=DISABLED [2020-12-09 10:15:32,273 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2020-12-09 10:15:32,273 INFO L138 SettingsManager]: * Explicit value domain=true [2020-12-09 10:15:32,273 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2020-12-09 10:15:32,273 INFO L138 SettingsManager]: * Octagon Domain=false [2020-12-09 10:15:32,273 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2020-12-09 10:15:32,273 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2020-12-09 10:15:32,273 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2020-12-09 10:15:32,273 INFO L138 SettingsManager]: * Interval Domain=false [2020-12-09 10:15:32,274 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2020-12-09 10:15:32,274 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2020-12-09 10:15:32,274 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2020-12-09 10:15:32,274 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-12-09 10:15:32,274 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2020-12-09 10:15:32,274 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-12-09 10:15:32,275 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-12-09 10:15:32,275 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-12-09 10:15:32,275 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-12-09 10:15:32,275 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-12-09 10:15:32,275 INFO L138 SettingsManager]: * Check absence of signed integer overflows=true [2020-12-09 10:15:32,275 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-12-09 10:15:32,275 INFO L138 SettingsManager]: * Use constant arrays=true [2020-12-09 10:15:32,275 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-12-09 10:15:32,275 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-12-09 10:15:32,275 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-12-09 10:15:32,276 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-12-09 10:15:32,276 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-12-09 10:15:32,276 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-12-09 10:15:32,276 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-12-09 10:15:32,276 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2020-12-09 10:15:32,276 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-12-09 10:15:32,276 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-12-09 10:15:32,276 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-12-09 10:15:32,276 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2020-12-09 10:15:32,277 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/tmp/vcloud-vcloud-master/worker/run_dir_b81789ae-e79e-4241-9a98-4ef47fd188d6/bin/utaipan/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud-vcloud-master/worker/run_dir_b81789ae-e79e-4241-9a98-4ef47fd188d6/bin/utaipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! overflow) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 64bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> dd635190a9aa277670265f46b90ecce0c321a2a9 [2020-12-09 10:15:32,456 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-12-09 10:15:32,471 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-12-09 10:15:32,473 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-12-09 10:15:32,474 INFO L271 PluginConnector]: Initializing CDTParser... [2020-12-09 10:15:32,475 INFO L275 PluginConnector]: CDTParser initialized [2020-12-09 10:15:32,475 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/run_dir_b81789ae-e79e-4241-9a98-4ef47fd188d6/bin/utaipan/../../sv-benchmarks/c/termination-numeric/TwoWay.c [2020-12-09 10:15:32,516 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_b81789ae-e79e-4241-9a98-4ef47fd188d6/bin/utaipan/data/715d3ff24/8d6a3fcf4fc0448d83c86aaae705f596/FLAGce868af6c [2020-12-09 10:15:32,876 INFO L306 CDTParser]: Found 1 translation units. [2020-12-09 10:15:32,876 INFO L160 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/run_dir_b81789ae-e79e-4241-9a98-4ef47fd188d6/sv-benchmarks/c/termination-numeric/TwoWay.c [2020-12-09 10:15:32,881 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_b81789ae-e79e-4241-9a98-4ef47fd188d6/bin/utaipan/data/715d3ff24/8d6a3fcf4fc0448d83c86aaae705f596/FLAGce868af6c [2020-12-09 10:15:33,295 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/run_dir_b81789ae-e79e-4241-9a98-4ef47fd188d6/bin/utaipan/data/715d3ff24/8d6a3fcf4fc0448d83c86aaae705f596 [2020-12-09 10:15:33,296 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-12-09 10:15:33,297 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2020-12-09 10:15:33,298 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-12-09 10:15:33,298 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-12-09 10:15:33,300 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-12-09 10:15:33,301 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 09.12 10:15:33" (1/1) ... [2020-12-09 10:15:33,302 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@18c2c51c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 10:15:33, skipping insertion in model container [2020-12-09 10:15:33,302 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 09.12 10:15:33" (1/1) ... [2020-12-09 10:15:33,307 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-12-09 10:15:33,316 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-12-09 10:15:33,404 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-09 10:15:33,407 INFO L203 MainTranslator]: Completed pre-run [2020-12-09 10:15:33,416 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-09 10:15:33,425 INFO L208 MainTranslator]: Completed translation [2020-12-09 10:15:33,425 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 10:15:33 WrapperNode [2020-12-09 10:15:33,425 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-12-09 10:15:33,426 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2020-12-09 10:15:33,426 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2020-12-09 10:15:33,426 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2020-12-09 10:15:33,432 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 10:15:33" (1/1) ... [2020-12-09 10:15:33,435 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 10:15:33" (1/1) ... [2020-12-09 10:15:33,447 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2020-12-09 10:15:33,447 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-12-09 10:15:33,448 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-12-09 10:15:33,448 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-12-09 10:15:33,454 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 10:15:33" (1/1) ... [2020-12-09 10:15:33,454 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 10:15:33" (1/1) ... [2020-12-09 10:15:33,454 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 10:15:33" (1/1) ... [2020-12-09 10:15:33,455 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 10:15:33" (1/1) ... [2020-12-09 10:15:33,456 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 10:15:33" (1/1) ... [2020-12-09 10:15:33,458 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 10:15:33" (1/1) ... [2020-12-09 10:15:33,458 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 10:15:33" (1/1) ... [2020-12-09 10:15:33,459 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-12-09 10:15:33,460 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-12-09 10:15:33,460 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-12-09 10:15:33,460 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-12-09 10:15:33,461 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 10:15:33" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_b81789ae-e79e-4241-9a98-4ef47fd188d6/bin/utaipan/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-12-09 10:15:33,516 INFO L130 BoogieDeclarations]: Found specification of procedure twoWay [2020-12-09 10:15:33,517 INFO L138 BoogieDeclarations]: Found implementation of procedure twoWay [2020-12-09 10:15:33,517 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-12-09 10:15:33,517 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-12-09 10:15:33,653 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-12-09 10:15:33,653 INFO L299 CfgBuilder]: Removed 4 assume(true) statements. [2020-12-09 10:15:33,655 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 09.12 10:15:33 BoogieIcfgContainer [2020-12-09 10:15:33,655 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-12-09 10:15:33,656 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-12-09 10:15:33,656 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-12-09 10:15:33,659 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-12-09 10:15:33,659 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 09.12 10:15:33" (1/3) ... [2020-12-09 10:15:33,660 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6309d862 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 09.12 10:15:33, skipping insertion in model container [2020-12-09 10:15:33,660 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 10:15:33" (2/3) ... [2020-12-09 10:15:33,660 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6309d862 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 09.12 10:15:33, skipping insertion in model container [2020-12-09 10:15:33,660 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 09.12 10:15:33" (3/3) ... [2020-12-09 10:15:33,661 INFO L111 eAbstractionObserver]: Analyzing ICFG TwoWay.c [2020-12-09 10:15:33,671 INFO L180 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-12-09 10:15:33,673 INFO L192 ceAbstractionStarter]: Appying trace abstraction to program that has 6 error locations. [2020-12-09 10:15:33,682 INFO L253 AbstractCegarLoop]: Starting to check reachability of 6 error locations. [2020-12-09 10:15:33,700 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-12-09 10:15:33,700 INFO L378 AbstractCegarLoop]: Hoare is true [2020-12-09 10:15:33,700 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-12-09 10:15:33,700 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-12-09 10:15:33,700 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-12-09 10:15:33,700 INFO L382 AbstractCegarLoop]: Difference is false [2020-12-09 10:15:33,700 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-12-09 10:15:33,700 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-12-09 10:15:33,715 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states. [2020-12-09 10:15:33,720 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2020-12-09 10:15:33,720 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 10:15:33,721 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2020-12-09 10:15:33,721 INFO L429 AbstractCegarLoop]: === Iteration 1 === [twoWayErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, twoWayErr5ASSERT_VIOLATIONINTEGER_OVERFLOW, twoWayErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, twoWayErr2ASSERT_VIOLATIONINTEGER_OVERFLOW, twoWayErr3ASSERT_VIOLATIONINTEGER_OVERFLOW, twoWayErr4ASSERT_VIOLATIONINTEGER_OVERFLOW]=== [2020-12-09 10:15:33,726 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 10:15:33,727 INFO L82 PathProgramCache]: Analyzing trace with hash 1734939443, now seen corresponding path program 1 times [2020-12-09 10:15:33,734 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 10:15:33,735 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [904640281] [2020-12-09 10:15:33,735 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 10:15:33,809 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 10:15:33,881 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 10:15:33,882 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [904640281] [2020-12-09 10:15:33,882 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-09 10:15:33,883 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-12-09 10:15:33,883 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [250277506] [2020-12-09 10:15:33,887 INFO L461 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-12-09 10:15:33,888 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 10:15:33,897 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-12-09 10:15:33,898 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2020-12-09 10:15:33,899 INFO L87 Difference]: Start difference. First operand 26 states. Second operand 7 states. [2020-12-09 10:15:34,021 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 10:15:34,022 INFO L93 Difference]: Finished difference Result 55 states and 64 transitions. [2020-12-09 10:15:34,022 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-12-09 10:15:34,023 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 8 [2020-12-09 10:15:34,023 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 10:15:34,029 INFO L225 Difference]: With dead ends: 55 [2020-12-09 10:15:34,029 INFO L226 Difference]: Without dead ends: 51 [2020-12-09 10:15:34,032 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=29, Invalid=61, Unknown=0, NotChecked=0, Total=90 [2020-12-09 10:15:34,043 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2020-12-09 10:15:34,063 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 37. [2020-12-09 10:15:34,064 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-12-09 10:15:34,066 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 47 transitions. [2020-12-09 10:15:34,066 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 47 transitions. Word has length 8 [2020-12-09 10:15:34,067 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 10:15:34,067 INFO L481 AbstractCegarLoop]: Abstraction has 37 states and 47 transitions. [2020-12-09 10:15:34,067 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-12-09 10:15:34,067 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 47 transitions. [2020-12-09 10:15:34,067 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2020-12-09 10:15:34,067 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 10:15:34,067 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2020-12-09 10:15:34,068 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-12-09 10:15:34,068 INFO L429 AbstractCegarLoop]: === Iteration 2 === [twoWayErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, twoWayErr5ASSERT_VIOLATIONINTEGER_OVERFLOW, twoWayErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, twoWayErr2ASSERT_VIOLATIONINTEGER_OVERFLOW, twoWayErr3ASSERT_VIOLATIONINTEGER_OVERFLOW, twoWayErr4ASSERT_VIOLATIONINTEGER_OVERFLOW]=== [2020-12-09 10:15:34,068 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 10:15:34,069 INFO L82 PathProgramCache]: Analyzing trace with hash 1734939635, now seen corresponding path program 1 times [2020-12-09 10:15:34,069 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 10:15:34,069 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [348806762] [2020-12-09 10:15:34,069 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 10:15:34,080 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 10:15:34,094 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 10:15:34,094 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [348806762] [2020-12-09 10:15:34,094 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-09 10:15:34,094 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-12-09 10:15:34,095 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1490949864] [2020-12-09 10:15:34,095 INFO L461 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-12-09 10:15:34,096 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 10:15:34,096 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-12-09 10:15:34,096 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-12-09 10:15:34,097 INFO L87 Difference]: Start difference. First operand 37 states and 47 transitions. Second operand 4 states. [2020-12-09 10:15:34,110 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 10:15:34,110 INFO L93 Difference]: Finished difference Result 45 states and 54 transitions. [2020-12-09 10:15:34,110 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-12-09 10:15:34,111 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 8 [2020-12-09 10:15:34,111 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 10:15:34,111 INFO L225 Difference]: With dead ends: 45 [2020-12-09 10:15:34,111 INFO L226 Difference]: Without dead ends: 18 [2020-12-09 10:15:34,112 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-12-09 10:15:34,113 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-12-09 10:15:34,115 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2020-12-09 10:15:34,115 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-12-09 10:15:34,115 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2020-12-09 10:15:34,115 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 8 [2020-12-09 10:15:34,116 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 10:15:34,116 INFO L481 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2020-12-09 10:15:34,116 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-12-09 10:15:34,116 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2020-12-09 10:15:34,116 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2020-12-09 10:15:34,116 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 10:15:34,116 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-09 10:15:34,116 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-12-09 10:15:34,117 INFO L429 AbstractCegarLoop]: === Iteration 3 === [twoWayErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, twoWayErr5ASSERT_VIOLATIONINTEGER_OVERFLOW, twoWayErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, twoWayErr2ASSERT_VIOLATIONINTEGER_OVERFLOW, twoWayErr3ASSERT_VIOLATIONINTEGER_OVERFLOW, twoWayErr4ASSERT_VIOLATIONINTEGER_OVERFLOW]=== [2020-12-09 10:15:34,117 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 10:15:34,117 INFO L82 PathProgramCache]: Analyzing trace with hash -2051452074, now seen corresponding path program 1 times [2020-12-09 10:15:34,117 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 10:15:34,118 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [501547694] [2020-12-09 10:15:34,118 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 10:15:34,125 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 10:15:34,138 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 10:15:34,139 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [501547694] [2020-12-09 10:15:34,139 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-09 10:15:34,139 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-12-09 10:15:34,139 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1475705426] [2020-12-09 10:15:34,139 INFO L461 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-12-09 10:15:34,140 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 10:15:34,140 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-12-09 10:15:34,140 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-12-09 10:15:34,140 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand 4 states. [2020-12-09 10:15:34,155 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 10:15:34,155 INFO L93 Difference]: Finished difference Result 18 states and 19 transitions. [2020-12-09 10:15:34,155 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-12-09 10:15:34,155 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 9 [2020-12-09 10:15:34,156 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 10:15:34,156 INFO L225 Difference]: With dead ends: 18 [2020-12-09 10:15:34,156 INFO L226 Difference]: Without dead ends: 17 [2020-12-09 10:15:34,157 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-12-09 10:15:34,157 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2020-12-09 10:15:34,159 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2020-12-09 10:15:34,160 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-12-09 10:15:34,160 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 18 transitions. [2020-12-09 10:15:34,160 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 18 transitions. Word has length 9 [2020-12-09 10:15:34,161 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 10:15:34,161 INFO L481 AbstractCegarLoop]: Abstraction has 17 states and 18 transitions. [2020-12-09 10:15:34,161 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-12-09 10:15:34,161 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 18 transitions. [2020-12-09 10:15:34,161 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-12-09 10:15:34,161 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 10:15:34,162 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-09 10:15:34,162 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-12-09 10:15:34,162 INFO L429 AbstractCegarLoop]: === Iteration 4 === [twoWayErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, twoWayErr5ASSERT_VIOLATIONINTEGER_OVERFLOW, twoWayErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, twoWayErr2ASSERT_VIOLATIONINTEGER_OVERFLOW, twoWayErr3ASSERT_VIOLATIONINTEGER_OVERFLOW, twoWayErr4ASSERT_VIOLATIONINTEGER_OVERFLOW]=== [2020-12-09 10:15:34,163 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 10:15:34,163 INFO L82 PathProgramCache]: Analyzing trace with hash 2048642091, now seen corresponding path program 1 times [2020-12-09 10:15:34,163 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 10:15:34,163 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [605818648] [2020-12-09 10:15:34,163 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 10:15:34,177 ERROR L270 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2020-12-09 10:15:34,177 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1215426121] [2020-12-09 10:15:34,177 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_b81789ae-e79e-4241-9a98-4ef47fd188d6/bin/utaipan/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-09 10:15:34,201 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 10:15:34,202 INFO L263 TraceCheckSpWp]: Trace formula consists of 55 conjuncts, 6 conjunts are in the unsatisfiable core [2020-12-09 10:15:34,207 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-09 10:15:34,270 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-12-09 10:15:34,271 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-09 10:15:34,332 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 10:15:34,332 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [605818648] [2020-12-09 10:15:34,332 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-12-09 10:15:34,332 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1215426121] [2020-12-09 10:15:34,332 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2020-12-09 10:15:34,333 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [3] total 6 [2020-12-09 10:15:34,333 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1031906224] [2020-12-09 10:15:34,333 INFO L461 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-12-09 10:15:34,333 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 10:15:34,334 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-12-09 10:15:34,334 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2020-12-09 10:15:34,334 INFO L87 Difference]: Start difference. First operand 17 states and 18 transitions. Second operand 5 states. [2020-12-09 10:15:34,379 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 10:15:34,379 INFO L93 Difference]: Finished difference Result 24 states and 25 transitions. [2020-12-09 10:15:34,380 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-12-09 10:15:34,380 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 16 [2020-12-09 10:15:34,380 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 10:15:34,381 INFO L225 Difference]: With dead ends: 24 [2020-12-09 10:15:34,381 INFO L226 Difference]: Without dead ends: 23 [2020-12-09 10:15:34,381 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2020-12-09 10:15:34,382 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-12-09 10:15:34,385 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 21. [2020-12-09 10:15:34,385 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-12-09 10:15:34,386 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2020-12-09 10:15:34,386 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 16 [2020-12-09 10:15:34,387 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 10:15:34,387 INFO L481 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2020-12-09 10:15:34,387 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-12-09 10:15:34,387 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2020-12-09 10:15:34,387 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-12-09 10:15:34,388 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 10:15:34,388 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-09 10:15:34,590 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-09 10:15:34,592 INFO L429 AbstractCegarLoop]: === Iteration 5 === [twoWayErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, twoWayErr5ASSERT_VIOLATIONINTEGER_OVERFLOW, twoWayErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, twoWayErr2ASSERT_VIOLATIONINTEGER_OVERFLOW, twoWayErr3ASSERT_VIOLATIONINTEGER_OVERFLOW, twoWayErr4ASSERT_VIOLATIONINTEGER_OVERFLOW]=== [2020-12-09 10:15:34,593 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 10:15:34,594 INFO L82 PathProgramCache]: Analyzing trace with hash -916604565, now seen corresponding path program 1 times [2020-12-09 10:15:34,594 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 10:15:34,595 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2124364204] [2020-12-09 10:15:34,596 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 10:15:34,632 ERROR L270 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2020-12-09 10:15:34,633 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [859405983] [2020-12-09 10:15:34,633 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_b81789ae-e79e-4241-9a98-4ef47fd188d6/bin/utaipan/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-09 10:15:34,726 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 10:15:34,729 INFO L263 TraceCheckSpWp]: Trace formula consists of 56 conjuncts, 12 conjunts are in the unsatisfiable core [2020-12-09 10:15:34,733 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-09 10:15:34,819 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-12-09 10:15:34,819 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-09 10:15:34,871 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2124364204] [2020-12-09 10:15:34,871 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-12-09 10:15:34,871 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [859405983] [2020-12-09 10:15:34,871 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_DEPENDING: cannot handle proper monomial [2020-12-09 10:15:34,871 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [742847408] [2020-12-09 10:15:34,885 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2020-12-09 10:15:34,886 INFO L166 IcfgInterpreter]: Building call graph [2020-12-09 10:15:34,889 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:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:289) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:189) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:179) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:84) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:74) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:511) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterateInternal(AbstractCegarLoop.java:438) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:372) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopResult.iterate(CegarLoopResult.java:138) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.iterateNew(TraceAbstractionStarter.java:345) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:198) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2020-12-09 10:15:34,889 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 0 imperfect interpolant sequences. [2020-12-09 10:15:34,890 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [] total 0 [2020-12-09 10:15:34,890 ERROR L205 FreeRefinementEngine]: Strategy SIFA_TAIPAN failed to provide any proof altough trace is infeasible [2020-12-09 10:15:34,890 INFO L523 BasicCegarLoop]: Counterexample might be feasible [2020-12-09 10:15:35,093 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-09 10:15:35,102 WARN L254 ceAbstractionStarter]: Unable to decide correctness. Please check the following counterexample manually. [2020-12-09 10:15:35,102 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 09.12 10:15:35 BoogieIcfgContainer [2020-12-09 10:15:35,102 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-12-09 10:15:35,103 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2020-12-09 10:15:35,103 INFO L271 PluginConnector]: Initializing Witness Printer... [2020-12-09 10:15:35,103 INFO L275 PluginConnector]: Witness Printer initialized [2020-12-09 10:15:35,103 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 09.12 10:15:33" (3/4) ... [2020-12-09 10:15:35,105 INFO L140 WitnessPrinter]: No result that supports witness generation found [2020-12-09 10:15:35,105 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2020-12-09 10:15:35,106 INFO L168 Benchmark]: Toolchain (without parser) took 1808.20 ms. Allocated memory was 94.4 MB in the beginning and 113.2 MB in the end (delta: 18.9 MB). Free memory was 72.6 MB in the beginning and 58.7 MB in the end (delta: 13.9 MB). Peak memory consumption was 31.0 MB. Max. memory is 16.1 GB. [2020-12-09 10:15:35,107 INFO L168 Benchmark]: CDTParser took 0.11 ms. Allocated memory is still 67.1 MB. Free memory was 42.0 MB in the beginning and 41.9 MB in the end (delta: 67.1 kB). There was no memory consumed. Max. memory is 16.1 GB. [2020-12-09 10:15:35,107 INFO L168 Benchmark]: CACSL2BoogieTranslator took 127.28 ms. Allocated memory is still 94.4 MB. Free memory was 72.3 MB in the beginning and 63.8 MB in the end (delta: 8.4 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. [2020-12-09 10:15:35,108 INFO L168 Benchmark]: Boogie Procedure Inliner took 20.98 ms. Allocated memory is still 94.4 MB. Free memory was 63.8 MB in the beginning and 62.5 MB in the end (delta: 1.4 MB). There was no memory consumed. Max. memory is 16.1 GB. [2020-12-09 10:15:35,108 INFO L168 Benchmark]: Boogie Preprocessor took 11.97 ms. Allocated memory is still 94.4 MB. Free memory was 62.5 MB in the beginning and 61.4 MB in the end (delta: 1.0 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2020-12-09 10:15:35,109 INFO L168 Benchmark]: RCFGBuilder took 194.72 ms. Allocated memory is still 94.4 MB. Free memory was 61.4 MB in the beginning and 68.1 MB in the end (delta: -6.7 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. [2020-12-09 10:15:35,109 INFO L168 Benchmark]: TraceAbstraction took 1446.52 ms. Allocated memory was 94.4 MB in the beginning and 113.2 MB in the end (delta: 18.9 MB). Free memory was 67.5 MB in the beginning and 58.7 MB in the end (delta: 8.8 MB). Peak memory consumption was 29.6 MB. Max. memory is 16.1 GB. [2020-12-09 10:15:35,109 INFO L168 Benchmark]: Witness Printer took 2.61 ms. Allocated memory is still 113.2 MB. Free memory is still 58.7 MB. There was no memory consumed. Max. memory is 16.1 GB. [2020-12-09 10:15:35,112 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.11 ms. Allocated memory is still 67.1 MB. Free memory was 42.0 MB in the beginning and 41.9 MB in the end (delta: 67.1 kB). There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 127.28 ms. Allocated memory is still 94.4 MB. Free memory was 72.3 MB in the beginning and 63.8 MB in the end (delta: 8.4 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. * Boogie Procedure Inliner took 20.98 ms. Allocated memory is still 94.4 MB. Free memory was 63.8 MB in the beginning and 62.5 MB in the end (delta: 1.4 MB). There was no memory consumed. Max. memory is 16.1 GB. * Boogie Preprocessor took 11.97 ms. Allocated memory is still 94.4 MB. Free memory was 62.5 MB in the beginning and 61.4 MB in the end (delta: 1.0 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * RCFGBuilder took 194.72 ms. Allocated memory is still 94.4 MB. Free memory was 61.4 MB in the beginning and 68.1 MB in the end (delta: -6.7 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. * TraceAbstraction took 1446.52 ms. Allocated memory was 94.4 MB in the beginning and 113.2 MB in the end (delta: 18.9 MB). Free memory was 67.5 MB in the beginning and 58.7 MB in the end (delta: 8.8 MB). Peak memory consumption was 29.6 MB. Max. memory is 16.1 GB. * Witness Printer took 2.61 ms. Allocated memory is still 113.2 MB. Free memory is still 58.7 MB. There was no memory consumed. Max. memory is 16.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - UnprovableResult [Line: 36]: Unable to prove that integer overflow can never occur Unable to prove that integer overflow can never occur Reason: unable to decide satisfiability of path constraint. Possible FailurePath: [L41] int x = __VERIFIER_nondet_int(); [L42] COND FALSE !(x < 0) [L44] int y = __VERIFIER_nondet_int(); [L45] COND FALSE !(y < 0) [L47] int z = __VERIFIER_nondet_int(); [L48] CALL twoWay(1,x) [L27] COND FALSE !(n < 0) [L30] int m = n; [L31] COND TRUE \read(terminate) [L32] m-- [L36] CALL, EXPR twoWay(terminate, m) [L27] COND TRUE n < 0 [L28] return 1; [L36] RET, EXPR twoWay(terminate, m) [L36] m*twoWay(terminate, m) - StatisticsResult: Ultimate Automizer benchmark data CFG has 2 procedures, 26 locations, 6 error locations. Started 1 CEGAR loops. VerificationResult: UNKNOWN, OverallTime: 1.3s, OverallIterations: 5, TraceHistogramMax: 2, AutomataDifference: 0.2s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 64 SDtfs, 96 SDslu, 149 SDs, 0 SdLazy, 123 SolverSat, 17 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.0s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 49 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=37occurred in iteration=1, 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, 4 MinimizatonAttempts, 16 StatesRemovedByMinimization, 2 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.0s SatisfiabilityAnalysisTime, 0.2s InterpolantComputationTime, 41 NumberOfCodeBlocks, 41 NumberOfCodeBlocksAsserted, 4 NumberOfCheckSat, 52 ConstructedInterpolants, 0 QuantifiedInterpolants, 1310 SizeOfPredicates, 2 NumberOfNonLiveVariables, 55 ConjunctsInSsa, 6 ConjunctsInUnsatCore, 5 InterpolantComputations, 4 PerfectInterpolantSequences, 2/4 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate could not prove your program: unable to determine feasibility of some traces Received shutdown request...