./Ultimate.py --spec ../sv-benchmarks/c/properties/valid-memsafety.prp --file ../sv-benchmarks/c/memsafety-ext3/naturalNumbers1.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for memory safety (deref-memtrack) Using default analysis Version 678e0110 Using bit-precise analysis Retrying with bit-precise analysis Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/config -Xmx12G -Xms1G -jar /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data -tc /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/AutomizerMemDerefMemtrack.xml -i ../sv-benchmarks/c/memsafety-ext3/naturalNumbers1.c -s /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-DerefFreeMemtrack-32bit-Automizer_Bitvector.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) --witnessprinter.graph.data.producer Automizer --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 932f76685ed1816d93a388d0ab1addae9c51483a ................................................................................................................................................................................................................................................................................................................................................................................................................................................. Execution finished normally Writing output log to file Ultimate.log Result: TRUE --- Real Ultimate output --- Skipped default analysis because property is memsafety ### Bit-precise run ### This is Ultimate 0.1.24-678e011 [2019-11-20 11:06:46,192 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-11-20 11:06:46,194 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-11-20 11:06:46,205 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-11-20 11:06:46,206 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-11-20 11:06:46,207 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-11-20 11:06:46,208 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-11-20 11:06:46,210 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-11-20 11:06:46,212 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-11-20 11:06:46,213 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-11-20 11:06:46,214 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-11-20 11:06:46,215 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-11-20 11:06:46,215 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-11-20 11:06:46,217 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-11-20 11:06:46,218 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-11-20 11:06:46,219 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-11-20 11:06:46,220 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-11-20 11:06:46,221 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-11-20 11:06:46,223 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-11-20 11:06:46,225 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-11-20 11:06:46,227 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-11-20 11:06:46,228 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-11-20 11:06:46,229 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-11-20 11:06:46,230 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-11-20 11:06:46,233 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2019-11-20 11:06:46,233 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2019-11-20 11:06:46,233 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2019-11-20 11:06:46,234 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2019-11-20 11:06:46,235 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2019-11-20 11:06:46,236 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2019-11-20 11:06:46,236 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2019-11-20 11:06:46,237 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2019-11-20 11:06:46,238 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2019-11-20 11:06:46,239 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2019-11-20 11:06:46,240 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2019-11-20 11:06:46,240 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2019-11-20 11:06:46,241 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2019-11-20 11:06:46,241 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2019-11-20 11:06:46,241 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-11-20 11:06:46,242 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-11-20 11:06:46,243 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-11-20 11:06:46,244 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-DerefFreeMemtrack-32bit-Automizer_Bitvector.epf [2019-11-20 11:06:46,259 INFO L113 SettingsManager]: Loading preferences was successful [2019-11-20 11:06:46,260 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-11-20 11:06:46,261 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-11-20 11:06:46,261 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-11-20 11:06:46,261 INFO L138 SettingsManager]: * Use SBE=true [2019-11-20 11:06:46,262 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-11-20 11:06:46,262 INFO L138 SettingsManager]: * sizeof long=4 [2019-11-20 11:06:46,262 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2019-11-20 11:06:46,262 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-11-20 11:06:46,262 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-11-20 11:06:46,263 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-11-20 11:06:46,263 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2019-11-20 11:06:46,263 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2019-11-20 11:06:46,263 INFO L138 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2019-11-20 11:06:46,263 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-11-20 11:06:46,264 INFO L138 SettingsManager]: * Use bitvectors instead of ints=true [2019-11-20 11:06:46,264 INFO L138 SettingsManager]: * Memory model=HoenickeLindenmann_4ByteResolution [2019-11-20 11:06:46,264 INFO L138 SettingsManager]: * sizeof long double=12 [2019-11-20 11:06:46,264 INFO L138 SettingsManager]: * Use constant arrays=true [2019-11-20 11:06:46,265 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-11-20 11:06:46,265 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-11-20 11:06:46,265 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-11-20 11:06:46,265 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-11-20 11:06:46,265 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-11-20 11:06:46,266 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-11-20 11:06:46,266 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-11-20 11:06:46,266 INFO L138 SettingsManager]: * Trace refinement strategy=WOLF [2019-11-20 11:06:46,266 INFO L138 SettingsManager]: * Command for external solver=cvc4 --incremental --rewrite-divk --print-success --lang smt [2019-11-20 11:06:46,266 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-11-20 11:06:46,267 INFO L138 SettingsManager]: * Logic for external solver=AUFBV 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 -> /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux 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 valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 932f76685ed1816d93a388d0ab1addae9c51483a [2019-11-20 11:06:46,567 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-11-20 11:06:46,580 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-11-20 11:06:46,584 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-11-20 11:06:46,586 INFO L271 PluginConnector]: Initializing CDTParser... [2019-11-20 11:06:46,586 INFO L275 PluginConnector]: CDTParser initialized [2019-11-20 11:06:46,587 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/memsafety-ext3/naturalNumbers1.c [2019-11-20 11:06:46,673 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/423ecd307/b3b376444b45448b9476b05fe3499cf7/FLAGdd90f663e [2019-11-20 11:06:47,163 INFO L306 CDTParser]: Found 1 translation units. [2019-11-20 11:06:47,164 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/memsafety-ext3/naturalNumbers1.c [2019-11-20 11:06:47,170 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/423ecd307/b3b376444b45448b9476b05fe3499cf7/FLAGdd90f663e [2019-11-20 11:06:47,572 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/423ecd307/b3b376444b45448b9476b05fe3499cf7 [2019-11-20 11:06:47,575 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-11-20 11:06:47,576 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2019-11-20 11:06:47,577 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-11-20 11:06:47,578 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-11-20 11:06:47,581 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-11-20 11:06:47,582 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.11 11:06:47" (1/1) ... [2019-11-20 11:06:47,585 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1d38e4c6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:06:47, skipping insertion in model container [2019-11-20 11:06:47,585 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.11 11:06:47" (1/1) ... [2019-11-20 11:06:47,593 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-11-20 11:06:47,617 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-11-20 11:06:47,797 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-20 11:06:47,812 INFO L188 MainTranslator]: Completed pre-run [2019-11-20 11:06:47,829 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-20 11:06:47,850 INFO L192 MainTranslator]: Completed translation [2019-11-20 11:06:47,851 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:06:47 WrapperNode [2019-11-20 11:06:47,851 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-11-20 11:06:47,851 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-11-20 11:06:47,852 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-11-20 11:06:47,852 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-11-20 11:06:47,923 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:06:47" (1/1) ... [2019-11-20 11:06:47,925 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:06:47" (1/1) ... [2019-11-20 11:06:47,939 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:06:47" (1/1) ... [2019-11-20 11:06:47,940 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:06:47" (1/1) ... [2019-11-20 11:06:47,958 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:06:47" (1/1) ... [2019-11-20 11:06:47,965 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:06:47" (1/1) ... [2019-11-20 11:06:47,967 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:06:47" (1/1) ... [2019-11-20 11:06:47,970 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-11-20 11:06:47,970 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-11-20 11:06:47,971 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-11-20 11:06:47,971 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-11-20 11:06:47,971 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:06:47" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-11-20 11:06:48,035 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-11-20 11:06:48,035 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-11-20 11:06:48,036 INFO L138 BoogieDeclarations]: Found implementation of procedure areNatural [2019-11-20 11:06:48,036 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-11-20 11:06:48,036 INFO L130 BoogieDeclarations]: Found specification of procedure areNatural [2019-11-20 11:06:48,036 INFO L130 BoogieDeclarations]: Found specification of procedure read~intINTTYPE4 [2019-11-20 11:06:48,037 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-11-20 11:06:48,037 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2019-11-20 11:06:48,037 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE1 [2019-11-20 11:06:48,038 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2019-11-20 11:06:48,038 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-11-20 11:06:48,038 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-11-20 11:06:48,038 INFO L130 BoogieDeclarations]: Found specification of procedure write~intINTTYPE1 [2019-11-20 11:06:48,038 INFO L130 BoogieDeclarations]: Found specification of procedure write~intINTTYPE4 [2019-11-20 11:06:48,038 INFO L130 BoogieDeclarations]: Found specification of procedure read~intINTTYPE1 [2019-11-20 11:06:48,333 INFO L280 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-11-20 11:06:48,333 INFO L285 CfgBuilder]: Removed 1 assume(true) statements. [2019-11-20 11:06:48,335 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.11 11:06:48 BoogieIcfgContainer [2019-11-20 11:06:48,335 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-11-20 11:06:48,336 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-11-20 11:06:48,336 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-11-20 11:06:48,339 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-11-20 11:06:48,340 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.11 11:06:47" (1/3) ... [2019-11-20 11:06:48,340 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7126c2cc and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.11 11:06:48, skipping insertion in model container [2019-11-20 11:06:48,341 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:06:47" (2/3) ... [2019-11-20 11:06:48,341 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7126c2cc and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.11 11:06:48, skipping insertion in model container [2019-11-20 11:06:48,341 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.11 11:06:48" (3/3) ... [2019-11-20 11:06:48,346 INFO L109 eAbstractionObserver]: Analyzing ICFG naturalNumbers1.c [2019-11-20 11:06:48,364 INFO L153 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-11-20 11:06:48,371 INFO L165 ceAbstractionStarter]: Appying trace abstraction to program that has 3 error locations. [2019-11-20 11:06:48,381 INFO L249 AbstractCegarLoop]: Starting to check reachability of 3 error locations. [2019-11-20 11:06:48,400 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-11-20 11:06:48,400 INFO L374 AbstractCegarLoop]: Hoare is false [2019-11-20 11:06:48,400 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-11-20 11:06:48,400 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-11-20 11:06:48,400 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-11-20 11:06:48,400 INFO L378 AbstractCegarLoop]: Difference is false [2019-11-20 11:06:48,400 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-11-20 11:06:48,400 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-11-20 11:06:48,413 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states. [2019-11-20 11:06:48,420 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2019-11-20 11:06:48,421 INFO L402 BasicCegarLoop]: Found error trace [2019-11-20 11:06:48,421 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-20 11:06:48,422 INFO L410 AbstractCegarLoop]: === Iteration 1 === [mainErr0ENSURES_VIOLATIONMEMORY_LEAK, areNaturalErr1REQUIRES_VIOLATION, areNaturalErr0REQUIRES_VIOLATION]=== [2019-11-20 11:06:48,426 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-20 11:06:48,427 INFO L82 PathProgramCache]: Analyzing trace with hash -1845664052, now seen corresponding path program 1 times [2019-11-20 11:06:48,435 INFO L163 FreeRefinementEngine]: Executing refinement strategy WOLF [2019-11-20 11:06:48,436 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleCvc4 [796371635] [2019-11-20 11:06:48,436 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 2 with cvc4 --incremental --print-success --lang smt --rewrite-divk (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with cvc4 --incremental --print-success --lang smt --rewrite-divk [2019-11-20 11:06:48,541 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-20 11:06:48,545 INFO L255 TraceCheckSpWp]: Trace formula consists of 45 conjuncts, 4 conjunts are in the unsatisfiable core [2019-11-20 11:06:48,552 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-20 11:06:48,611 INFO L377 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2019-11-20 11:06:48,612 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-11-20 11:06:48,629 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-11-20 11:06:48,629 INFO L496 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-11-20 11:06:48,630 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:6, output treesize:5 [2019-11-20 11:06:48,671 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-20 11:06:48,672 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-20 11:06:48,703 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-20 11:06:48,705 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [796371635] [2019-11-20 11:06:48,705 INFO L220 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2019-11-20 11:06:48,706 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [] total 4 [2019-11-20 11:06:48,707 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [212349725] [2019-11-20 11:06:48,711 INFO L442 AbstractCegarLoop]: Interpolant automaton has 5 states [2019-11-20 11:06:48,712 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2019-11-20 11:06:48,726 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2019-11-20 11:06:48,727 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2019-11-20 11:06:48,729 INFO L87 Difference]: Start difference. First operand 22 states. Second operand 5 states. [2019-11-20 11:06:48,849 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-20 11:06:48,849 INFO L93 Difference]: Finished difference Result 21 states and 22 transitions. [2019-11-20 11:06:48,850 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-11-20 11:06:48,852 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 10 [2019-11-20 11:06:48,853 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-20 11:06:48,863 INFO L225 Difference]: With dead ends: 21 [2019-11-20 11:06:48,863 INFO L226 Difference]: Without dead ends: 18 [2019-11-20 11:06:48,867 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2019-11-20 11:06:48,890 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2019-11-20 11:06:48,911 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2019-11-20 11:06:48,913 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2019-11-20 11:06:48,914 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2019-11-20 11:06:48,916 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 10 [2019-11-20 11:06:48,917 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-20 11:06:48,917 INFO L462 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2019-11-20 11:06:48,917 INFO L463 AbstractCegarLoop]: Interpolant automaton has 5 states. [2019-11-20 11:06:48,917 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2019-11-20 11:06:48,919 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2019-11-20 11:06:48,919 INFO L402 BasicCegarLoop]: Found error trace [2019-11-20 11:06:48,919 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-20 11:06:49,121 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 cvc4 --incremental --print-success --lang smt --rewrite-divk [2019-11-20 11:06:49,122 INFO L410 AbstractCegarLoop]: === Iteration 2 === [mainErr0ENSURES_VIOLATIONMEMORY_LEAK, areNaturalErr1REQUIRES_VIOLATION, areNaturalErr0REQUIRES_VIOLATION]=== [2019-11-20 11:06:49,123 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-20 11:06:49,123 INFO L82 PathProgramCache]: Analyzing trace with hash -1845664051, now seen corresponding path program 1 times [2019-11-20 11:06:49,125 INFO L163 FreeRefinementEngine]: Executing refinement strategy WOLF [2019-11-20 11:06:49,125 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleCvc4 [82630415] [2019-11-20 11:06:49,125 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 3 with cvc4 --incremental --print-success --lang smt --rewrite-divk (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with cvc4 --incremental --print-success --lang smt --rewrite-divk [2019-11-20 11:06:49,205 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-20 11:06:49,207 INFO L255 TraceCheckSpWp]: Trace formula consists of 45 conjuncts, 8 conjunts are in the unsatisfiable core [2019-11-20 11:06:49,209 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-20 11:06:49,221 INFO L377 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2019-11-20 11:06:49,221 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-11-20 11:06:49,228 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-11-20 11:06:49,229 INFO L496 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-11-20 11:06:49,229 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:10, output treesize:9 [2019-11-20 11:06:49,278 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-20 11:06:49,279 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-20 11:06:49,512 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-20 11:06:49,512 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [82630415] [2019-11-20 11:06:49,513 INFO L220 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2019-11-20 11:06:49,513 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [] total 7 [2019-11-20 11:06:49,513 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2080091560] [2019-11-20 11:06:49,515 INFO L442 AbstractCegarLoop]: Interpolant automaton has 8 states [2019-11-20 11:06:49,515 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2019-11-20 11:06:49,515 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2019-11-20 11:06:49,516 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2019-11-20 11:06:49,516 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand 8 states. [2019-11-20 11:06:49,849 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-20 11:06:49,850 INFO L93 Difference]: Finished difference Result 28 states and 31 transitions. [2019-11-20 11:06:49,851 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-11-20 11:06:49,851 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 10 [2019-11-20 11:06:49,851 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-20 11:06:49,854 INFO L225 Difference]: With dead ends: 28 [2019-11-20 11:06:49,854 INFO L226 Difference]: Without dead ends: 28 [2019-11-20 11:06:49,855 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2019-11-20 11:06:49,855 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2019-11-20 11:06:49,860 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 23. [2019-11-20 11:06:49,860 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2019-11-20 11:06:49,861 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 26 transitions. [2019-11-20 11:06:49,861 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 26 transitions. Word has length 10 [2019-11-20 11:06:49,862 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-20 11:06:49,862 INFO L462 AbstractCegarLoop]: Abstraction has 23 states and 26 transitions. [2019-11-20 11:06:49,862 INFO L463 AbstractCegarLoop]: Interpolant automaton has 8 states. [2019-11-20 11:06:49,862 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 26 transitions. [2019-11-20 11:06:49,863 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2019-11-20 11:06:49,863 INFO L402 BasicCegarLoop]: Found error trace [2019-11-20 11:06:49,863 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-20 11:06:50,065 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 cvc4 --incremental --print-success --lang smt --rewrite-divk [2019-11-20 11:06:50,066 INFO L410 AbstractCegarLoop]: === Iteration 3 === [mainErr0ENSURES_VIOLATIONMEMORY_LEAK, areNaturalErr1REQUIRES_VIOLATION, areNaturalErr0REQUIRES_VIOLATION]=== [2019-11-20 11:06:50,067 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-20 11:06:50,067 INFO L82 PathProgramCache]: Analyzing trace with hash -1907814666, now seen corresponding path program 1 times [2019-11-20 11:06:50,068 INFO L163 FreeRefinementEngine]: Executing refinement strategy WOLF [2019-11-20 11:06:50,069 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleCvc4 [942201681] [2019-11-20 11:06:50,069 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 4 with cvc4 --incremental --print-success --lang smt --rewrite-divk (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with cvc4 --incremental --print-success --lang smt --rewrite-divk [2019-11-20 11:06:50,171 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-20 11:06:50,173 INFO L255 TraceCheckSpWp]: Trace formula consists of 57 conjuncts, 7 conjunts are in the unsatisfiable core [2019-11-20 11:06:50,175 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-20 11:06:50,182 INFO L377 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2019-11-20 11:06:50,182 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-11-20 11:06:50,185 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-11-20 11:06:50,185 INFO L496 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-11-20 11:06:50,186 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:6, output treesize:5 [2019-11-20 11:06:50,286 INFO L343 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2019-11-20 11:06:50,287 INFO L377 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 17 treesize of output 39 [2019-11-20 11:06:50,288 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-11-20 11:06:50,311 INFO L567 ElimStorePlain]: treesize reduction 10, result has 60.0 percent of original size [2019-11-20 11:06:50,312 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-20 11:06:50,316 INFO L496 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2019-11-20 11:06:50,316 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:17, output treesize:15 [2019-11-20 11:06:50,317 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-20 11:06:50,342 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-20 11:06:50,364 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-20 11:06:50,389 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-20 11:06:50,408 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-20 11:06:50,427 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-20 11:06:50,449 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-20 11:06:50,489 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-20 11:06:50,490 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-20 11:06:52,602 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-20 11:06:52,603 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [942201681] [2019-11-20 11:06:52,603 INFO L220 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2019-11-20 11:06:52,603 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5, 4] imperfect sequences [] total 8 [2019-11-20 11:06:52,604 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1972816972] [2019-11-20 11:06:52,605 INFO L442 AbstractCegarLoop]: Interpolant automaton has 9 states [2019-11-20 11:06:52,605 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2019-11-20 11:06:52,605 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2019-11-20 11:06:52,605 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=50, Unknown=1, NotChecked=0, Total=72 [2019-11-20 11:06:52,606 INFO L87 Difference]: Start difference. First operand 23 states and 26 transitions. Second operand 9 states. [2019-11-20 11:06:52,814 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-20 11:06:52,815 INFO L93 Difference]: Finished difference Result 22 states and 25 transitions. [2019-11-20 11:06:52,816 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-11-20 11:06:52,816 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 15 [2019-11-20 11:06:52,816 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-20 11:06:52,817 INFO L225 Difference]: With dead ends: 22 [2019-11-20 11:06:52,817 INFO L226 Difference]: Without dead ends: 17 [2019-11-20 11:06:52,818 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 16 SyntacticMatches, 7 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=34, Invalid=75, Unknown=1, NotChecked=0, Total=110 [2019-11-20 11:06:52,818 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2019-11-20 11:06:52,823 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2019-11-20 11:06:52,824 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2019-11-20 11:06:52,825 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2019-11-20 11:06:52,826 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 15 [2019-11-20 11:06:52,827 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-20 11:06:52,827 INFO L462 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2019-11-20 11:06:52,827 INFO L463 AbstractCegarLoop]: Interpolant automaton has 9 states. [2019-11-20 11:06:52,827 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2019-11-20 11:06:52,828 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2019-11-20 11:06:52,828 INFO L402 BasicCegarLoop]: Found error trace [2019-11-20 11:06:52,829 INFO L410 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-20 11:06:53,031 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 cvc4 --incremental --print-success --lang smt --rewrite-divk [2019-11-20 11:06:53,032 INFO L410 AbstractCegarLoop]: === Iteration 4 === [mainErr0ENSURES_VIOLATIONMEMORY_LEAK, areNaturalErr1REQUIRES_VIOLATION, areNaturalErr0REQUIRES_VIOLATION]=== [2019-11-20 11:06:53,032 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-20 11:06:53,032 INFO L82 PathProgramCache]: Analyzing trace with hash 1004346541, now seen corresponding path program 1 times [2019-11-20 11:06:53,033 INFO L163 FreeRefinementEngine]: Executing refinement strategy WOLF [2019-11-20 11:06:53,033 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleCvc4 [1661619332] [2019-11-20 11:06:53,034 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 5 with cvc4 --incremental --print-success --lang smt --rewrite-divk (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with cvc4 --incremental --print-success --lang smt --rewrite-divk [2019-11-20 11:06:53,148 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-20 11:06:53,150 INFO L255 TraceCheckSpWp]: Trace formula consists of 61 conjuncts, 9 conjunts are in the unsatisfiable core [2019-11-20 11:06:53,152 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-20 11:06:53,210 INFO L377 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 8 [2019-11-20 11:06:53,210 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-11-20 11:06:53,214 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-11-20 11:06:53,214 INFO L496 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2019-11-20 11:06:53,215 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:16, output treesize:4 [2019-11-20 11:06:53,227 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-11-20 11:06:53,227 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-20 11:06:53,341 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-11-20 11:06:53,342 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1661619332] [2019-11-20 11:06:53,342 INFO L220 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2019-11-20 11:06:53,342 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6, 6] imperfect sequences [] total 10 [2019-11-20 11:06:53,343 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1762542186] [2019-11-20 11:06:53,343 INFO L442 AbstractCegarLoop]: Interpolant automaton has 10 states [2019-11-20 11:06:53,343 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2019-11-20 11:06:53,344 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2019-11-20 11:06:53,344 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2019-11-20 11:06:53,344 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand 10 states. [2019-11-20 11:06:53,444 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-20 11:06:53,444 INFO L93 Difference]: Finished difference Result 11 states and 10 transitions. [2019-11-20 11:06:53,444 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-11-20 11:06:53,444 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 16 [2019-11-20 11:06:53,445 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-20 11:06:53,445 INFO L225 Difference]: With dead ends: 11 [2019-11-20 11:06:53,445 INFO L226 Difference]: Without dead ends: 0 [2019-11-20 11:06:53,445 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 22 SyntacticMatches, 1 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=36, Invalid=96, Unknown=0, NotChecked=0, Total=132 [2019-11-20 11:06:53,446 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2019-11-20 11:06:53,446 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2019-11-20 11:06:53,446 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2019-11-20 11:06:53,446 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2019-11-20 11:06:53,447 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 16 [2019-11-20 11:06:53,447 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-20 11:06:53,447 INFO L462 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2019-11-20 11:06:53,447 INFO L463 AbstractCegarLoop]: Interpolant automaton has 10 states. [2019-11-20 11:06:53,447 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2019-11-20 11:06:53,447 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2019-11-20 11:06:53,649 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 cvc4 --incremental --print-success --lang smt --rewrite-divk [2019-11-20 11:06:53,656 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 20.11 11:06:53 BoogieIcfgContainer [2019-11-20 11:06:53,656 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2019-11-20 11:06:53,657 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2019-11-20 11:06:53,657 INFO L271 PluginConnector]: Initializing Witness Printer... [2019-11-20 11:06:53,657 INFO L275 PluginConnector]: Witness Printer initialized [2019-11-20 11:06:53,658 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.11 11:06:48" (3/4) ... [2019-11-20 11:06:53,662 INFO L137 WitnessPrinter]: Generating witness for correct program [2019-11-20 11:06:53,668 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure ULTIMATE.init [2019-11-20 11:06:53,668 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure main [2019-11-20 11:06:53,668 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure areNatural [2019-11-20 11:06:53,673 INFO L902 BoogieBacktranslator]: Reduced CFG by removing 15 nodes and edges [2019-11-20 11:06:53,673 INFO L902 BoogieBacktranslator]: Reduced CFG by removing 7 nodes and edges [2019-11-20 11:06:53,673 INFO L902 BoogieBacktranslator]: Reduced CFG by removing 2 nodes and edges [2019-11-20 11:06:53,673 INFO L902 BoogieBacktranslator]: Reduced CFG by removing 1 nodes and edges [2019-11-20 11:06:53,674 INFO L902 BoogieBacktranslator]: Reduced CFG by removing 1 nodes and edges [2019-11-20 11:06:53,720 INFO L141 WitnessManager]: Wrote witness to /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/witness.graphml [2019-11-20 11:06:53,720 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2019-11-20 11:06:53,722 INFO L168 Benchmark]: Toolchain (without parser) took 6145.13 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 145.2 MB). Free memory was 956.3 MB in the beginning and 952.1 MB in the end (delta: 4.2 MB). Peak memory consumption was 149.4 MB. Max. memory is 11.5 GB. [2019-11-20 11:06:53,722 INFO L168 Benchmark]: CDTParser took 0.40 ms. Allocated memory is still 1.0 GB. Free memory is still 981.8 MB. There was no memory consumed. Max. memory is 11.5 GB. [2019-11-20 11:06:53,723 INFO L168 Benchmark]: CACSL2BoogieTranslator took 273.74 ms. Allocated memory is still 1.0 GB. Free memory was 956.3 MB in the beginning and 945.6 MB in the end (delta: 10.7 MB). Peak memory consumption was 10.7 MB. Max. memory is 11.5 GB. [2019-11-20 11:06:53,724 INFO L168 Benchmark]: Boogie Preprocessor took 118.58 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 145.2 MB). Free memory was 945.6 MB in the beginning and 1.1 GB in the end (delta: -189.7 MB). Peak memory consumption was 9.8 MB. Max. memory is 11.5 GB. [2019-11-20 11:06:53,724 INFO L168 Benchmark]: RCFGBuilder took 364.71 ms. Allocated memory is still 1.2 GB. Free memory was 1.1 GB in the beginning and 1.1 GB in the end (delta: 19.1 MB). Peak memory consumption was 19.1 MB. Max. memory is 11.5 GB. [2019-11-20 11:06:53,725 INFO L168 Benchmark]: TraceAbstraction took 5320.43 ms. Allocated memory is still 1.2 GB. Free memory was 1.1 GB in the beginning and 958.7 MB in the end (delta: 157.5 MB). Peak memory consumption was 157.5 MB. Max. memory is 11.5 GB. [2019-11-20 11:06:53,725 INFO L168 Benchmark]: Witness Printer took 63.29 ms. Allocated memory is still 1.2 GB. Free memory was 958.7 MB in the beginning and 952.1 MB in the end (delta: 6.6 MB). Peak memory consumption was 6.6 MB. Max. memory is 11.5 GB. [2019-11-20 11:06:53,729 INFO L335 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.40 ms. Allocated memory is still 1.0 GB. Free memory is still 981.8 MB. There was no memory consumed. Max. memory is 11.5 GB. * CACSL2BoogieTranslator took 273.74 ms. Allocated memory is still 1.0 GB. Free memory was 956.3 MB in the beginning and 945.6 MB in the end (delta: 10.7 MB). Peak memory consumption was 10.7 MB. Max. memory is 11.5 GB. * Boogie Preprocessor took 118.58 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 145.2 MB). Free memory was 945.6 MB in the beginning and 1.1 GB in the end (delta: -189.7 MB). Peak memory consumption was 9.8 MB. Max. memory is 11.5 GB. * RCFGBuilder took 364.71 ms. Allocated memory is still 1.2 GB. Free memory was 1.1 GB in the beginning and 1.1 GB in the end (delta: 19.1 MB). Peak memory consumption was 19.1 MB. Max. memory is 11.5 GB. * TraceAbstraction took 5320.43 ms. Allocated memory is still 1.2 GB. Free memory was 1.1 GB in the beginning and 958.7 MB in the end (delta: 157.5 MB). Peak memory consumption was 157.5 MB. Max. memory is 11.5 GB. * Witness Printer took 63.29 ms. Allocated memory is still 1.2 GB. Free memory was 958.7 MB in the beginning and 952.1 MB in the end (delta: 6.6 MB). Peak memory consumption was 6.6 MB. Max. memory is 11.5 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 12]: all allocated memory was freed For all program executions holds that all allocated memory was freed at this location - PositiveResult [Line: 4]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 4]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - AllSpecificationsHoldResult: All specifications hold 3 specifications checked. All of them hold - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 22 locations, 3 error locations. Result: SAFE, OverallTime: 5.2s, OverallIterations: 4, TraceHistogramMax: 3, AutomataDifference: 0.8s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, HoareTripleCheckerStatistics: 48 SDtfs, 83 SDslu, 109 SDs, 0 SdLazy, 126 SolverSat, 17 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.3s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 106 GetRequests, 67 SyntacticMatches, 8 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 2.9s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=23occurred in iteration=2, 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, 5 StatesRemovedByMinimization, 1 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.2s SatisfiabilityAnalysisTime, 3.0s InterpolantComputationTime, 51 NumberOfCodeBlocks, 51 NumberOfCodeBlocksAsserted, 4 NumberOfCheckSat, 94 ConstructedInterpolants, 7 QuantifiedInterpolants, 6673 SizeOfPredicates, 11 NumberOfNonLiveVariables, 208 ConjunctsInSsa, 28 ConjunctsInUnsatCore, 8 InterpolantComputations, 8 PerfectInterpolantSequences, 14/14 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 correct! Received shutdown request...