./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/list-ext3-properties/dll_nullified-1.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 7b2dab56 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud-vcloud-master/worker/run_dir_55d6fbf0-dafc-45a1-a38c-5848a233326c/bin/utaipan/data/config -Xmx15G -Xms4m -jar /tmp/vcloud-vcloud-master/worker/run_dir_55d6fbf0-dafc-45a1-a38c-5848a233326c/bin/utaipan/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/run_dir_55d6fbf0-dafc-45a1-a38c-5848a233326c/bin/utaipan/data -tc /tmp/vcloud-vcloud-master/worker/run_dir_55d6fbf0-dafc-45a1-a38c-5848a233326c/bin/utaipan/config/TaipanReach.xml -i ../../sv-benchmarks/c/list-ext3-properties/dll_nullified-1.i -s /tmp/vcloud-vcloud-master/worker/run_dir_55d6fbf0-dafc-45a1-a38c-5848a233326c/bin/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/run_dir_55d6fbf0-dafc-45a1-a38c-5848a233326c/bin/utaipan --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash c6bee9027c6ee41df2f7df0c67f6de4e3d806cb7 ................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ Execution finished normally Writing output log to file Ultimate.log Writing human readable error path to file UltimateCounterExample.errorpath Result: FALSE --- Real Ultimate output --- This is Ultimate 0.2.0-7b2dab5 [2020-12-09 16:37:56,566 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-12-09 16:37:56,567 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-12-09 16:37:56,589 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-12-09 16:37:56,590 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-12-09 16:37:56,591 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-12-09 16:37:56,592 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-12-09 16:37:56,594 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-12-09 16:37:56,595 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-12-09 16:37:56,596 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-12-09 16:37:56,597 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-12-09 16:37:56,598 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-12-09 16:37:56,599 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-12-09 16:37:56,599 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-12-09 16:37:56,600 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-12-09 16:37:56,601 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-12-09 16:37:56,602 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-12-09 16:37:56,603 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-12-09 16:37:56,604 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-12-09 16:37:56,606 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-12-09 16:37:56,608 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-12-09 16:37:56,609 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-12-09 16:37:56,610 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-12-09 16:37:56,611 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-12-09 16:37:56,613 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-12-09 16:37:56,614 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-12-09 16:37:56,614 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-12-09 16:37:56,615 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-12-09 16:37:56,615 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-12-09 16:37:56,616 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-12-09 16:37:56,616 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-12-09 16:37:56,617 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-12-09 16:37:56,618 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-12-09 16:37:56,619 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-12-09 16:37:56,619 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-12-09 16:37:56,620 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-12-09 16:37:56,620 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-12-09 16:37:56,620 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-12-09 16:37:56,621 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-12-09 16:37:56,621 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-12-09 16:37:56,622 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-12-09 16:37:56,623 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud-vcloud-master/worker/run_dir_55d6fbf0-dafc-45a1-a38c-5848a233326c/bin/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf [2020-12-09 16:37:56,640 INFO L113 SettingsManager]: Loading preferences was successful [2020-12-09 16:37:56,640 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-12-09 16:37:56,641 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2020-12-09 16:37:56,641 INFO L138 SettingsManager]: * User list type=DISABLED [2020-12-09 16:37:56,641 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2020-12-09 16:37:56,641 INFO L138 SettingsManager]: * Explicit value domain=true [2020-12-09 16:37:56,641 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2020-12-09 16:37:56,642 INFO L138 SettingsManager]: * Octagon Domain=false [2020-12-09 16:37:56,642 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2020-12-09 16:37:56,642 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2020-12-09 16:37:56,642 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2020-12-09 16:37:56,642 INFO L138 SettingsManager]: * Interval Domain=false [2020-12-09 16:37:56,642 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2020-12-09 16:37:56,642 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2020-12-09 16:37:56,642 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2020-12-09 16:37:56,643 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-12-09 16:37:56,643 INFO L138 SettingsManager]: * sizeof long=4 [2020-12-09 16:37:56,643 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-12-09 16:37:56,643 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-12-09 16:37:56,643 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-12-09 16:37:56,643 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-12-09 16:37:56,644 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-12-09 16:37:56,644 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-12-09 16:37:56,644 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2020-12-09 16:37:56,644 INFO L138 SettingsManager]: * sizeof long double=12 [2020-12-09 16:37:56,644 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-12-09 16:37:56,644 INFO L138 SettingsManager]: * Use constant arrays=true [2020-12-09 16:37:56,644 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-12-09 16:37:56,644 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-12-09 16:37:56,645 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-12-09 16:37:56,645 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-12-09 16:37:56,645 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-12-09 16:37:56,645 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-12-09 16:37:56,645 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-12-09 16:37:56,645 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2020-12-09 16:37:56,645 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-12-09 16:37:56,645 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-12-09 16:37:56,645 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-12-09 16:37:56,646 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2020-12-09 16:37:56,646 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_55d6fbf0-dafc-45a1-a38c-5848a233326c/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud-vcloud-master/worker/run_dir_55d6fbf0-dafc-45a1-a38c-5848a233326c/bin/utaipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> c6bee9027c6ee41df2f7df0c67f6de4e3d806cb7 [2020-12-09 16:37:56,851 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-12-09 16:37:56,871 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-12-09 16:37:56,873 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-12-09 16:37:56,873 INFO L271 PluginConnector]: Initializing CDTParser... [2020-12-09 16:37:56,874 INFO L275 PluginConnector]: CDTParser initialized [2020-12-09 16:37:56,875 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/run_dir_55d6fbf0-dafc-45a1-a38c-5848a233326c/bin/utaipan/../../sv-benchmarks/c/list-ext3-properties/dll_nullified-1.i [2020-12-09 16:37:56,917 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_55d6fbf0-dafc-45a1-a38c-5848a233326c/bin/utaipan/data/1d06e2352/96667ba1d3b848a686287b682dcbc53a/FLAGf67e8d218 [2020-12-09 16:37:57,330 INFO L306 CDTParser]: Found 1 translation units. [2020-12-09 16:37:57,330 INFO L160 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/run_dir_55d6fbf0-dafc-45a1-a38c-5848a233326c/sv-benchmarks/c/list-ext3-properties/dll_nullified-1.i [2020-12-09 16:37:57,342 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_55d6fbf0-dafc-45a1-a38c-5848a233326c/bin/utaipan/data/1d06e2352/96667ba1d3b848a686287b682dcbc53a/FLAGf67e8d218 [2020-12-09 16:37:57,353 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/run_dir_55d6fbf0-dafc-45a1-a38c-5848a233326c/bin/utaipan/data/1d06e2352/96667ba1d3b848a686287b682dcbc53a [2020-12-09 16:37:57,355 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-12-09 16:37:57,356 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2020-12-09 16:37:57,357 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-12-09 16:37:57,358 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-12-09 16:37:57,361 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-12-09 16:37:57,361 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 09.12 04:37:57" (1/1) ... [2020-12-09 16:37:57,363 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@e6cf0c0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 04:37:57, skipping insertion in model container [2020-12-09 16:37:57,364 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 09.12 04:37:57" (1/1) ... [2020-12-09 16:37:57,370 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-12-09 16:37:57,400 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-12-09 16:37:57,580 WARN L226 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud-vcloud-master/worker/run_dir_55d6fbf0-dafc-45a1-a38c-5848a233326c/sv-benchmarks/c/list-ext3-properties/dll_nullified-1.i[24046,24059] [2020-12-09 16:37:57,583 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-09 16:37:57,589 INFO L203 MainTranslator]: Completed pre-run [2020-12-09 16:37:57,617 WARN L226 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud-vcloud-master/worker/run_dir_55d6fbf0-dafc-45a1-a38c-5848a233326c/sv-benchmarks/c/list-ext3-properties/dll_nullified-1.i[24046,24059] [2020-12-09 16:37:57,618 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-09 16:37:57,652 INFO L208 MainTranslator]: Completed translation [2020-12-09 16:37:57,652 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 04:37:57 WrapperNode [2020-12-09 16:37:57,652 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-12-09 16:37:57,653 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2020-12-09 16:37:57,653 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2020-12-09 16:37:57,653 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2020-12-09 16:37:57,658 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 04:37:57" (1/1) ... [2020-12-09 16:37:57,668 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 04:37:57" (1/1) ... [2020-12-09 16:37:57,683 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2020-12-09 16:37:57,683 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-12-09 16:37:57,683 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-12-09 16:37:57,684 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-12-09 16:37:57,690 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 04:37:57" (1/1) ... [2020-12-09 16:37:57,690 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 04:37:57" (1/1) ... [2020-12-09 16:37:57,693 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 04:37:57" (1/1) ... [2020-12-09 16:37:57,693 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 04:37:57" (1/1) ... [2020-12-09 16:37:57,698 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 04:37:57" (1/1) ... [2020-12-09 16:37:57,701 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 04:37:57" (1/1) ... [2020-12-09 16:37:57,703 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 04:37:57" (1/1) ... [2020-12-09 16:37:57,705 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-12-09 16:37:57,706 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-12-09 16:37:57,706 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-12-09 16:37:57,706 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-12-09 16:37:57,707 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 04:37:57" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_55d6fbf0-dafc-45a1-a38c-5848a233326c/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 16:37:57,777 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-12-09 16:37:57,777 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-12-09 16:37:57,777 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2020-12-09 16:37:57,778 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2020-12-09 16:37:57,778 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-12-09 16:37:57,778 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2020-12-09 16:37:57,778 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-12-09 16:37:57,778 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-12-09 16:37:57,778 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-12-09 16:37:57,778 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-12-09 16:37:58,328 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-12-09 16:37:58,329 INFO L299 CfgBuilder]: Removed 11 assume(true) statements. [2020-12-09 16:37:58,331 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 09.12 04:37:58 BoogieIcfgContainer [2020-12-09 16:37:58,331 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-12-09 16:37:58,333 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-12-09 16:37:58,333 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-12-09 16:37:58,336 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-12-09 16:37:58,336 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 09.12 04:37:57" (1/3) ... [2020-12-09 16:37:58,337 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@17609d80 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 09.12 04:37:58, skipping insertion in model container [2020-12-09 16:37:58,337 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 04:37:57" (2/3) ... [2020-12-09 16:37:58,337 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@17609d80 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 09.12 04:37:58, skipping insertion in model container [2020-12-09 16:37:58,337 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 09.12 04:37:58" (3/3) ... [2020-12-09 16:37:58,344 INFO L111 eAbstractionObserver]: Analyzing ICFG dll_nullified-1.i [2020-12-09 16:37:58,354 INFO L180 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-12-09 16:37:58,357 INFO L192 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-12-09 16:37:58,364 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-12-09 16:37:58,381 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-12-09 16:37:58,381 INFO L378 AbstractCegarLoop]: Hoare is true [2020-12-09 16:37:58,381 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-12-09 16:37:58,381 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-12-09 16:37:58,382 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-12-09 16:37:58,382 INFO L382 AbstractCegarLoop]: Difference is false [2020-12-09 16:37:58,382 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-12-09 16:37:58,382 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-12-09 16:37:58,390 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states. [2020-12-09 16:37:58,394 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2020-12-09 16:37:58,394 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 16:37:58,395 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2020-12-09 16:37:58,395 INFO L429 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-09 16:37:58,399 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 16:37:58,399 INFO L82 PathProgramCache]: Analyzing trace with hash -202514067, now seen corresponding path program 1 times [2020-12-09 16:37:58,406 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 16:37:58,406 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1801113183] [2020-12-09 16:37:58,406 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 16:37:58,478 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 16:37:58,531 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 16:37:58,532 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1801113183] [2020-12-09 16:37:58,532 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-09 16:37:58,532 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-12-09 16:37:58,533 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1982916858] [2020-12-09 16:37:58,537 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-12-09 16:37:58,537 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 16:37:58,549 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-12-09 16:37:58,550 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-12-09 16:37:58,552 INFO L87 Difference]: Start difference. First operand 13 states. Second operand 3 states. [2020-12-09 16:37:58,622 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 16:37:58,622 INFO L93 Difference]: Finished difference Result 25 states and 37 transitions. [2020-12-09 16:37:58,623 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-12-09 16:37:58,623 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 6 [2020-12-09 16:37:58,624 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 16:37:58,629 INFO L225 Difference]: With dead ends: 25 [2020-12-09 16:37:58,629 INFO L226 Difference]: Without dead ends: 12 [2020-12-09 16:37:58,631 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-12-09 16:37:58,642 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2020-12-09 16:37:58,650 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 11. [2020-12-09 16:37:58,651 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 11 states. [2020-12-09 16:37:58,651 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 14 transitions. [2020-12-09 16:37:58,652 INFO L78 Accepts]: Start accepts. Automaton has 11 states and 14 transitions. Word has length 6 [2020-12-09 16:37:58,652 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 16:37:58,652 INFO L481 AbstractCegarLoop]: Abstraction has 11 states and 14 transitions. [2020-12-09 16:37:58,652 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-12-09 16:37:58,652 INFO L276 IsEmpty]: Start isEmpty. Operand 11 states and 14 transitions. [2020-12-09 16:37:58,653 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2020-12-09 16:37:58,653 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 16:37:58,653 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2020-12-09 16:37:58,653 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-12-09 16:37:58,653 INFO L429 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-09 16:37:58,654 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 16:37:58,654 INFO L82 PathProgramCache]: Analyzing trace with hash -1908068044, now seen corresponding path program 1 times [2020-12-09 16:37:58,654 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 16:37:58,654 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [304348291] [2020-12-09 16:37:58,654 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 16:37:58,679 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 16:37:58,708 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 16:37:58,708 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [304348291] [2020-12-09 16:37:58,708 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1241954935] [2020-12-09 16:37:58,708 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_55d6fbf0-dafc-45a1-a38c-5848a233326c/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 16:37:58,761 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 16:37:58,762 INFO L263 TraceCheckSpWp]: Trace formula consists of 89 conjuncts, 5 conjunts are in the unsatisfiable core [2020-12-09 16:37:58,766 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-09 16:37:58,807 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 16:37:58,807 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-09 16:37:58,837 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 16:37:58,837 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1655810269] [2020-12-09 16:37:58,859 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2020-12-09 16:37:58,859 INFO L166 IcfgInterpreter]: Building call graph [2020-12-09 16:37:58,864 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-12-09 16:37:58,869 INFO L176 IcfgInterpreter]: Starting interpretation [2020-12-09 16:37:58,869 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-12-09 16:37:59,119 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-12-09 16:37:59,136 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-12-09 16:37:59,178 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-12-09 16:37:59,219 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-12-09 16:38:00,245 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-12-09 16:38:02,860 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-12-09 16:38:02,895 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-12-09 16:38:02,906 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-12-09 16:38:03,162 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-12-09 16:38:03,297 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-12-09 16:38:22,184 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-12-09 16:38:22,206 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-12-09 16:38:23,641 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-12-09 16:38:23,659 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-12-09 16:38:23,670 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-12-09 16:38:26,712 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-12-09 16:38:29,008 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-12-09 16:38:29,018 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-12-09 16:38:29,160 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-12-09 16:38:29,213 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-12-09 16:38:35,388 INFO L180 IcfgInterpreter]: Interpretation finished [2020-12-09 16:38:35,882 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-12-09 16:38:35,882 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-12-09 16:38:35,882 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 6 [2020-12-09 16:38:35,883 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1907827244] [2020-12-09 16:38:35,883 INFO L461 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-12-09 16:38:35,883 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 16:38:35,884 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-12-09 16:38:35,884 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=115, Unknown=0, NotChecked=0, Total=156 [2020-12-09 16:38:35,884 INFO L87 Difference]: Start difference. First operand 11 states and 14 transitions. Second operand 7 states. [2020-12-09 16:38:36,037 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 16:38:36,038 INFO L93 Difference]: Finished difference Result 24 states and 32 transitions. [2020-12-09 16:38:36,038 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-12-09 16:38:36,038 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 8 [2020-12-09 16:38:36,038 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 16:38:36,038 INFO L225 Difference]: With dead ends: 24 [2020-12-09 16:38:36,039 INFO L226 Difference]: Without dead ends: 17 [2020-12-09 16:38:36,039 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 45 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=41, Invalid=115, Unknown=0, NotChecked=0, Total=156 [2020-12-09 16:38:36,039 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2020-12-09 16:38:36,041 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2020-12-09 16:38:36,041 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-12-09 16:38:36,041 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 20 transitions. [2020-12-09 16:38:36,041 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 20 transitions. Word has length 8 [2020-12-09 16:38:36,041 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 16:38:36,041 INFO L481 AbstractCegarLoop]: Abstraction has 17 states and 20 transitions. [2020-12-09 16:38:36,042 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-12-09 16:38:36,042 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 20 transitions. [2020-12-09 16:38:36,042 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-12-09 16:38:36,042 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 16:38:36,042 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1] [2020-12-09 16:38:36,243 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2020-12-09 16:38:36,244 INFO L429 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-09 16:38:36,245 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 16:38:36,245 INFO L82 PathProgramCache]: Analyzing trace with hash -1124747563, now seen corresponding path program 2 times [2020-12-09 16:38:36,246 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 16:38:36,246 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [11603017] [2020-12-09 16:38:36,246 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 16:38:36,293 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 16:38:36,345 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 16:38:36,346 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [11603017] [2020-12-09 16:38:36,346 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [600542647] [2020-12-09 16:38:36,346 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_55d6fbf0-dafc-45a1-a38c-5848a233326c/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 16:38:37,999 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2020-12-09 16:38:37,999 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-09 16:38:38,001 INFO L263 TraceCheckSpWp]: Trace formula consists of 185 conjuncts, 8 conjunts are in the unsatisfiable core [2020-12-09 16:38:38,003 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-09 16:38:38,020 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 16:38:38,020 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-09 16:38:38,037 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 16:38:38,037 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1758265410] [2020-12-09 16:38:38,039 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2020-12-09 16:38:38,039 INFO L166 IcfgInterpreter]: Building call graph [2020-12-09 16:38:38,039 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-12-09 16:38:38,039 INFO L176 IcfgInterpreter]: Starting interpretation [2020-12-09 16:38:38,039 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-12-09 16:38:38,152 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-12-09 16:38:38,173 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-12-09 16:38:38,183 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-12-09 16:38:38,217 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-12-09 16:38:39,062 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-12-09 16:38:39,163 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-12-09 16:38:39,173 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-12-09 16:38:39,184 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-12-09 16:38:39,385 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-12-09 16:38:39,621 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-12-09 16:38:39,630 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-12-09 16:38:54,846 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-12-09 16:38:54,853 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-12-09 16:38:56,226 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-12-09 16:38:57,521 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-12-09 16:38:58,612 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-12-09 16:38:59,620 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-12-09 16:38:59,650 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-12-09 16:38:59,803 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-12-09 16:39:00,424 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-12-09 16:39:12,056 INFO L180 IcfgInterpreter]: Interpretation finished [2020-12-09 16:39:12,583 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-12-09 16:39:12,583 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-12-09 16:39:12,583 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 7 [2020-12-09 16:39:12,583 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [467029063] [2020-12-09 16:39:12,583 INFO L461 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-12-09 16:39:12,583 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 16:39:12,584 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-12-09 16:39:12,584 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=134, Unknown=0, NotChecked=0, Total=182 [2020-12-09 16:39:12,584 INFO L87 Difference]: Start difference. First operand 17 states and 20 transitions. Second operand 8 states. [2020-12-09 16:39:12,763 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 16:39:12,764 INFO L93 Difference]: Finished difference Result 26 states and 32 transitions. [2020-12-09 16:39:12,764 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-12-09 16:39:12,764 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 14 [2020-12-09 16:39:12,764 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 16:39:12,765 INFO L225 Difference]: With dead ends: 26 [2020-12-09 16:39:12,765 INFO L226 Difference]: Without dead ends: 19 [2020-12-09 16:39:12,765 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 33 SyntacticMatches, 1 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 49 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=48, Invalid=134, Unknown=0, NotChecked=0, Total=182 [2020-12-09 16:39:12,765 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2020-12-09 16:39:12,767 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2020-12-09 16:39:12,767 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2020-12-09 16:39:12,767 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 22 transitions. [2020-12-09 16:39:12,767 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 22 transitions. Word has length 14 [2020-12-09 16:39:12,767 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 16:39:12,767 INFO L481 AbstractCegarLoop]: Abstraction has 19 states and 22 transitions. [2020-12-09 16:39:12,767 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-12-09 16:39:12,767 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 22 transitions. [2020-12-09 16:39:12,768 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-12-09 16:39:12,768 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 16:39:12,768 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 1, 1, 1, 1, 1, 1] [2020-12-09 16:39:12,968 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable76,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-09 16:39:12,969 INFO L429 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-09 16:39:12,970 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 16:39:12,970 INFO L82 PathProgramCache]: Analyzing trace with hash 1594824160, now seen corresponding path program 3 times [2020-12-09 16:39:12,971 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 16:39:12,971 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1130251848] [2020-12-09 16:39:12,971 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 16:39:13,080 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-12-09 16:39:13,081 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-12-09 16:39:13,138 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-12-09 16:39:13,138 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-12-09 16:39:13,160 INFO L173 FreeRefinementEngine]: Strategy SIFA_TAIPAN found a feasible trace [2020-12-09 16:39:13,160 INFO L523 BasicCegarLoop]: Counterexample might be feasible [2020-12-09 16:39:13,160 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable151 [2020-12-09 16:39:13,185 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 09.12 04:39:13 BoogieIcfgContainer [2020-12-09 16:39:13,185 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-12-09 16:39:13,186 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2020-12-09 16:39:13,186 INFO L271 PluginConnector]: Initializing Witness Printer... [2020-12-09 16:39:13,186 INFO L275 PluginConnector]: Witness Printer initialized [2020-12-09 16:39:13,186 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 09.12 04:37:58" (3/4) ... [2020-12-09 16:39:13,188 INFO L131 WitnessPrinter]: Generating witness for reachability counterexample [2020-12-09 16:39:13,222 INFO L141 WitnessManager]: Wrote witness to /tmp/vcloud-vcloud-master/worker/run_dir_55d6fbf0-dafc-45a1-a38c-5848a233326c/bin/utaipan/witness.graphml [2020-12-09 16:39:13,222 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2020-12-09 16:39:13,223 INFO L168 Benchmark]: Toolchain (without parser) took 75866.62 ms. Allocated memory was 113.2 MB in the beginning and 211.8 MB in the end (delta: 98.6 MB). Free memory was 69.7 MB in the beginning and 66.6 MB in the end (delta: 3.1 MB). Peak memory consumption was 104.3 MB. Max. memory is 16.1 GB. [2020-12-09 16:39:13,223 INFO L168 Benchmark]: CDTParser took 0.17 ms. Allocated memory is still 113.2 MB. Free memory was 87.4 MB in the beginning and 87.2 MB in the end (delta: 157.3 kB). There was no memory consumed. Max. memory is 16.1 GB. [2020-12-09 16:39:13,223 INFO L168 Benchmark]: CACSL2BoogieTranslator took 295.09 ms. Allocated memory is still 113.2 MB. Free memory was 69.5 MB in the beginning and 77.2 MB in the end (delta: -7.7 MB). Peak memory consumption was 11.6 MB. Max. memory is 16.1 GB. [2020-12-09 16:39:13,223 INFO L168 Benchmark]: Boogie Procedure Inliner took 29.88 ms. Allocated memory is still 113.2 MB. Free memory was 77.2 MB in the beginning and 75.6 MB in the end (delta: 1.7 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2020-12-09 16:39:13,224 INFO L168 Benchmark]: Boogie Preprocessor took 22.27 ms. Allocated memory is still 113.2 MB. Free memory was 75.2 MB in the beginning and 73.9 MB in the end (delta: 1.3 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2020-12-09 16:39:13,224 INFO L168 Benchmark]: RCFGBuilder took 624.75 ms. Allocated memory is still 113.2 MB. Free memory was 73.9 MB in the beginning and 89.4 MB in the end (delta: -15.5 MB). Peak memory consumption was 26.2 MB. Max. memory is 16.1 GB. [2020-12-09 16:39:13,224 INFO L168 Benchmark]: TraceAbstraction took 74852.96 ms. Allocated memory was 113.2 MB in the beginning and 211.8 MB in the end (delta: 98.6 MB). Free memory was 88.8 MB in the beginning and 69.7 MB in the end (delta: 19.1 MB). Peak memory consumption was 116.8 MB. Max. memory is 16.1 GB. [2020-12-09 16:39:13,224 INFO L168 Benchmark]: Witness Printer took 36.24 ms. Allocated memory is still 211.8 MB. Free memory was 69.7 MB in the beginning and 66.6 MB in the end (delta: 3.1 MB). Peak memory consumption was 4.2 MB. Max. memory is 16.1 GB. [2020-12-09 16:39:13,226 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.17 ms. Allocated memory is still 113.2 MB. Free memory was 87.4 MB in the beginning and 87.2 MB in the end (delta: 157.3 kB). There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 295.09 ms. Allocated memory is still 113.2 MB. Free memory was 69.5 MB in the beginning and 77.2 MB in the end (delta: -7.7 MB). Peak memory consumption was 11.6 MB. Max. memory is 16.1 GB. * Boogie Procedure Inliner took 29.88 ms. Allocated memory is still 113.2 MB. Free memory was 77.2 MB in the beginning and 75.6 MB in the end (delta: 1.7 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * Boogie Preprocessor took 22.27 ms. Allocated memory is still 113.2 MB. Free memory was 75.2 MB in the beginning and 73.9 MB in the end (delta: 1.3 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * RCFGBuilder took 624.75 ms. Allocated memory is still 113.2 MB. Free memory was 73.9 MB in the beginning and 89.4 MB in the end (delta: -15.5 MB). Peak memory consumption was 26.2 MB. Max. memory is 16.1 GB. * TraceAbstraction took 74852.96 ms. Allocated memory was 113.2 MB in the beginning and 211.8 MB in the end (delta: 98.6 MB). Free memory was 88.8 MB in the beginning and 69.7 MB in the end (delta: 19.1 MB). Peak memory consumption was 116.8 MB. Max. memory is 16.1 GB. * Witness Printer took 36.24 ms. Allocated memory is still 211.8 MB. Free memory was 69.7 MB in the beginning and 66.6 MB in the end (delta: 3.1 MB). Peak memory consumption was 4.2 MB. Max. memory is 16.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 616]: a call to reach_error is reachable a call to reach_error is reachable We found a FailurePath: [L599] const int len = 5; [L579] DLL head = ((void *)0); [L580] COND TRUE len > 0 [L581] DLL new_head = (DLL) malloc(sizeof(struct node)); [L582] COND FALSE !(((void *)0) == new_head) [L585] new_head->data_0 = 0 [L586] new_head->data_1 = 0 [L587] EXPR __VERIFIER_nondet_int() == len? 1 : 0 [L587] new_head->data_2 = __VERIFIER_nondet_int() == len? 1 : 0 [L588] new_head->next = head [L589] new_head->prev = ((void *)0) [L590] COND FALSE !(\read(head)) [L593] head = new_head [L594] len-- [L580] COND TRUE len > 0 [L581] DLL new_head = (DLL) malloc(sizeof(struct node)); [L582] COND FALSE !(((void *)0) == new_head) [L585] new_head->data_0 = 0 [L586] new_head->data_1 = 0 [L587] EXPR __VERIFIER_nondet_int() == len? 1 : 0 [L587] new_head->data_2 = __VERIFIER_nondet_int() == len? 1 : 0 [L588] new_head->next = head [L589] new_head->prev = ((void *)0) [L590] COND TRUE \read(head) [L591] head->prev = new_head [L593] head = new_head [L594] len-- [L580] COND TRUE len > 0 [L581] DLL new_head = (DLL) malloc(sizeof(struct node)); [L582] COND FALSE !(((void *)0) == new_head) [L585] new_head->data_0 = 0 [L586] new_head->data_1 = 0 [L587] EXPR __VERIFIER_nondet_int() == len? 1 : 0 [L587] new_head->data_2 = __VERIFIER_nondet_int() == len? 1 : 0 [L588] new_head->next = head [L589] new_head->prev = ((void *)0) [L590] COND TRUE \read(head) [L591] head->prev = new_head [L593] head = new_head [L594] len-- [L580] COND TRUE len > 0 [L581] DLL new_head = (DLL) malloc(sizeof(struct node)); [L582] COND FALSE !(((void *)0) == new_head) [L585] new_head->data_0 = 0 [L586] new_head->data_1 = 0 [L587] EXPR __VERIFIER_nondet_int() == len? 1 : 0 [L587] new_head->data_2 = __VERIFIER_nondet_int() == len? 1 : 0 [L588] new_head->next = head [L589] new_head->prev = ((void *)0) [L590] COND TRUE \read(head) [L591] head->prev = new_head [L593] head = new_head [L594] len-- [L580] COND TRUE len > 0 [L581] DLL new_head = (DLL) malloc(sizeof(struct node)); [L582] COND FALSE !(((void *)0) == new_head) [L585] new_head->data_0 = 0 [L586] new_head->data_1 = 0 [L587] EXPR __VERIFIER_nondet_int() == len? 1 : 0 [L587] new_head->data_2 = __VERIFIER_nondet_int() == len? 1 : 0 [L588] new_head->next = head [L589] new_head->prev = ((void *)0) [L590] COND TRUE \read(head) [L591] head->prev = new_head [L593] head = new_head [L594] len-- [L580] COND FALSE !(len > 0) [L596] return head; [L600] DLL head = dll_create(len); [L601] head->next [L601] COND TRUE head->next [L602] EXPR head->data_0 [L602] EXPR 0 != head->data_0 || 0 != head->data_1 [L602] EXPR head->data_1 [L602] EXPR 0 != head->data_0 || 0 != head->data_1 [L602] 0 != head->data_0 || 0 != head->data_1 || 0 != head->data_2 [L602] EXPR head->data_2 [L602] 0 != head->data_0 || 0 != head->data_1 || 0 != head->data_2 [L602] COND TRUE 0 != head->data_0 || 0 != head->data_1 || 0 != head->data_2 [L616] reach_error() - StatisticsResult: Ultimate Automizer benchmark data CFG has 1 procedures, 13 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 74.7s, OverallIterations: 4, TraceHistogramMax: 5, AutomataDifference: 0.4s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 37 SDtfs, 12 SDslu, 76 SDs, 0 SdLazy, 36 SolverSat, 6 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.3s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 73 GetRequests, 48 SyntacticMatches, 1 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 94 ImplicationChecksByTransitivity, 1.0s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=19occurred in iteration=3, 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, 3 MinimizatonAttempts, 1 StatesRemovedByMinimization, 1 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 1.8s SatisfiabilityAnalysisTime, 0.2s InterpolantComputationTime, 66 NumberOfCodeBlocks, 66 NumberOfCodeBlocksAsserted, 10 NumberOfCheckSat, 65 ConstructedInterpolants, 0 QuantifiedInterpolants, 1517 SizeOfPredicates, 4 NumberOfNonLiveVariables, 274 ConjunctsInSsa, 13 ConjunctsInUnsatCore, 7 InterpolantComputations, 1 PerfectInterpolantSequences, 0/51 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! Received shutdown request...