./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 f470102c Calling Ultimate with: /usr/lib/jvm/java-8-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud-vcloud-master/worker/run_dir_93502547-4684-4524-a5eb-cb02178a5159/bin/utaipan/data/config -Xmx12G -Xms1G -jar /tmp/vcloud-vcloud-master/worker/run_dir_93502547-4684-4524-a5eb-cb02178a5159/bin/utaipan/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/run_dir_93502547-4684-4524-a5eb-cb02178a5159/bin/utaipan/data -tc /tmp/vcloud-vcloud-master/worker/run_dir_93502547-4684-4524-a5eb-cb02178a5159/bin/utaipan/config/TaipanReach.xml -i ../../sv-benchmarks/c/list-ext3-properties/dll_nullified-1.i -s /tmp/vcloud-vcloud-master/worker/run_dir_93502547-4684-4524-a5eb-cb02178a5159/bin/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/run_dir_93502547-4684-4524-a5eb-cb02178a5159/bin/utaipan --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(__VERIFIER_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 573d04c3ab16ffed1ccac6c6179d92b670a825d7 ......................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... Execution finished normally Writing output log to file Ultimate.log Writing human readable error path to file UltimateCounterExample.errorpath Result: FALSE --- Real Ultimate output --- This is Ultimate 0.1.25-f470102 [2019-12-07 15:46:45,529 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-12-07 15:46:45,530 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-12-07 15:46:45,537 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-12-07 15:46:45,538 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-12-07 15:46:45,538 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-12-07 15:46:45,539 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-12-07 15:46:45,540 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-12-07 15:46:45,542 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-12-07 15:46:45,542 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-12-07 15:46:45,543 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-12-07 15:46:45,544 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-12-07 15:46:45,544 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-12-07 15:46:45,544 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-12-07 15:46:45,545 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-12-07 15:46:45,546 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-12-07 15:46:45,546 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-12-07 15:46:45,547 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-12-07 15:46:45,548 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-12-07 15:46:45,550 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-12-07 15:46:45,551 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-12-07 15:46:45,552 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-12-07 15:46:45,552 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-12-07 15:46:45,553 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-12-07 15:46:45,554 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2019-12-07 15:46:45,555 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2019-12-07 15:46:45,555 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2019-12-07 15:46:45,555 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2019-12-07 15:46:45,555 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2019-12-07 15:46:45,556 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2019-12-07 15:46:45,556 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2019-12-07 15:46:45,557 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2019-12-07 15:46:45,557 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2019-12-07 15:46:45,557 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2019-12-07 15:46:45,558 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2019-12-07 15:46:45,558 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2019-12-07 15:46:45,558 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2019-12-07 15:46:45,559 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2019-12-07 15:46:45,559 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-12-07 15:46:45,559 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-12-07 15:46:45,560 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-12-07 15:46:45,560 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud-vcloud-master/worker/run_dir_93502547-4684-4524-a5eb-cb02178a5159/bin/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf [2019-12-07 15:46:45,570 INFO L113 SettingsManager]: Loading preferences was successful [2019-12-07 15:46:45,570 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-12-07 15:46:45,570 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2019-12-07 15:46:45,570 INFO L138 SettingsManager]: * User list type=DISABLED [2019-12-07 15:46:45,570 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2019-12-07 15:46:45,571 INFO L138 SettingsManager]: * Explicit value domain=true [2019-12-07 15:46:45,571 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2019-12-07 15:46:45,571 INFO L138 SettingsManager]: * Octagon Domain=false [2019-12-07 15:46:45,571 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2019-12-07 15:46:45,571 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2019-12-07 15:46:45,571 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2019-12-07 15:46:45,571 INFO L138 SettingsManager]: * Interval Domain=false [2019-12-07 15:46:45,571 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2019-12-07 15:46:45,571 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2019-12-07 15:46:45,571 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2019-12-07 15:46:45,572 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-12-07 15:46:45,572 INFO L138 SettingsManager]: * sizeof long=4 [2019-12-07 15:46:45,572 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-12-07 15:46:45,572 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-12-07 15:46:45,572 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-12-07 15:46:45,572 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-12-07 15:46:45,573 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-12-07 15:46:45,573 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-12-07 15:46:45,573 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2019-12-07 15:46:45,573 INFO L138 SettingsManager]: * sizeof long double=12 [2019-12-07 15:46:45,573 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-12-07 15:46:45,573 INFO L138 SettingsManager]: * Use constant arrays=true [2019-12-07 15:46:45,573 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-12-07 15:46:45,573 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-12-07 15:46:45,573 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-12-07 15:46:45,574 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-12-07 15:46:45,574 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-12-07 15:46:45,574 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-12-07 15:46:45,574 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-12-07 15:46:45,574 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-12-07 15:46:45,574 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2019-12-07 15:46:45,574 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-12-07 15:46:45,574 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-12-07 15:46:45,574 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2019-12-07 15:46:45,575 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-12-07 15:46:45,575 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud-vcloud-master/worker/run_dir_93502547-4684-4524-a5eb-cb02178a5159/bin/utaipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(__VERIFIER_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 573d04c3ab16ffed1ccac6c6179d92b670a825d7 [2019-12-07 15:46:45,673 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-12-07 15:46:45,682 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-12-07 15:46:45,684 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-12-07 15:46:45,685 INFO L271 PluginConnector]: Initializing CDTParser... [2019-12-07 15:46:45,685 INFO L275 PluginConnector]: CDTParser initialized [2019-12-07 15:46:45,685 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/run_dir_93502547-4684-4524-a5eb-cb02178a5159/bin/utaipan/../../sv-benchmarks/c/list-ext3-properties/dll_nullified-1.i [2019-12-07 15:46:45,721 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_93502547-4684-4524-a5eb-cb02178a5159/bin/utaipan/data/b95d24bed/c51fe6f1bf1743bbb1e9b848f9aac4f2/FLAG36f291d3a [2019-12-07 15:46:46,224 INFO L306 CDTParser]: Found 1 translation units. [2019-12-07 15:46:46,224 INFO L160 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/run_dir_93502547-4684-4524-a5eb-cb02178a5159/sv-benchmarks/c/list-ext3-properties/dll_nullified-1.i [2019-12-07 15:46:46,233 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_93502547-4684-4524-a5eb-cb02178a5159/bin/utaipan/data/b95d24bed/c51fe6f1bf1743bbb1e9b848f9aac4f2/FLAG36f291d3a [2019-12-07 15:46:46,246 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/run_dir_93502547-4684-4524-a5eb-cb02178a5159/bin/utaipan/data/b95d24bed/c51fe6f1bf1743bbb1e9b848f9aac4f2 [2019-12-07 15:46:46,249 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-12-07 15:46:46,250 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2019-12-07 15:46:46,251 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-12-07 15:46:46,251 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-12-07 15:46:46,254 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-12-07 15:46:46,255 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.12 03:46:46" (1/1) ... [2019-12-07 15:46:46,257 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@17d8b502 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 03:46:46, skipping insertion in model container [2019-12-07 15:46:46,257 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.12 03:46:46" (1/1) ... [2019-12-07 15:46:46,264 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2019-12-07 15:46:46,293 INFO L178 MainTranslator]: Built tables and reachable declarations [2019-12-07 15:46:46,515 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-12-07 15:46:46,521 INFO L203 MainTranslator]: Completed pre-run [2019-12-07 15:46:46,551 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-12-07 15:46:46,581 INFO L208 MainTranslator]: Completed translation [2019-12-07 15:46:46,581 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 03:46:46 WrapperNode [2019-12-07 15:46:46,581 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-12-07 15:46:46,582 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2019-12-07 15:46:46,582 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2019-12-07 15:46:46,582 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2019-12-07 15:46:46,587 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 03:46:46" (1/1) ... [2019-12-07 15:46:46,596 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 03:46:46" (1/1) ... [2019-12-07 15:46:46,611 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2019-12-07 15:46:46,612 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-12-07 15:46:46,612 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-12-07 15:46:46,612 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-12-07 15:46:46,618 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 03:46:46" (1/1) ... [2019-12-07 15:46:46,618 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 03:46:46" (1/1) ... [2019-12-07 15:46:46,620 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 03:46:46" (1/1) ... [2019-12-07 15:46:46,620 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 03:46:46" (1/1) ... [2019-12-07 15:46:46,625 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 03:46:46" (1/1) ... [2019-12-07 15:46:46,629 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 03:46:46" (1/1) ... [2019-12-07 15:46:46,630 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 03:46:46" (1/1) ... [2019-12-07 15:46:46,632 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-12-07 15:46:46,632 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-12-07 15:46:46,633 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-12-07 15:46:46,633 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-12-07 15:46:46,633 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 03:46:46" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_93502547-4684-4524-a5eb-cb02178a5159/bin/utaipan/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-12-07 15:46:46,672 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2019-12-07 15:46:46,672 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2019-12-07 15:46:46,672 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2019-12-07 15:46:46,672 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2019-12-07 15:46:46,673 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2019-12-07 15:46:46,673 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2019-12-07 15:46:46,673 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-12-07 15:46:46,673 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-12-07 15:46:47,026 INFO L282 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-12-07 15:46:47,026 INFO L287 CfgBuilder]: Removed 11 assume(true) statements. [2019-12-07 15:46:47,027 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.12 03:46:47 BoogieIcfgContainer [2019-12-07 15:46:47,027 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-12-07 15:46:47,028 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-12-07 15:46:47,028 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-12-07 15:46:47,030 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-12-07 15:46:47,030 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 07.12 03:46:46" (1/3) ... [2019-12-07 15:46:47,030 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1dd7d7c5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.12 03:46:47, skipping insertion in model container [2019-12-07 15:46:47,030 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 03:46:46" (2/3) ... [2019-12-07 15:46:47,031 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1dd7d7c5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.12 03:46:47, skipping insertion in model container [2019-12-07 15:46:47,031 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.12 03:46:47" (3/3) ... [2019-12-07 15:46:47,032 INFO L109 eAbstractionObserver]: Analyzing ICFG dll_nullified-1.i [2019-12-07 15:46:47,038 INFO L156 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-12-07 15:46:47,042 INFO L168 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-12-07 15:46:47,049 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-12-07 15:46:47,063 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-12-07 15:46:47,063 INFO L374 AbstractCegarLoop]: Hoare is true [2019-12-07 15:46:47,064 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-12-07 15:46:47,064 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-12-07 15:46:47,064 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-12-07 15:46:47,064 INFO L378 AbstractCegarLoop]: Difference is false [2019-12-07 15:46:47,064 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-12-07 15:46:47,064 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-12-07 15:46:47,072 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states. [2019-12-07 15:46:47,076 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2019-12-07 15:46:47,076 INFO L402 BasicCegarLoop]: Found error trace [2019-12-07 15:46:47,077 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2019-12-07 15:46:47,077 INFO L410 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-12-07 15:46:47,080 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-12-07 15:46:47,080 INFO L82 PathProgramCache]: Analyzing trace with hash -202514067, now seen corresponding path program 1 times [2019-12-07 15:46:47,086 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-12-07 15:46:47,086 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1550604734] [2019-12-07 15:46:47,086 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-12-07 15:46:47,145 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 15:46:47,180 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-12-07 15:46:47,181 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1550604734] [2019-12-07 15:46:47,181 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-12-07 15:46:47,181 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2019-12-07 15:46:47,182 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1491697368] [2019-12-07 15:46:47,185 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-12-07 15:46:47,185 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-12-07 15:46:47,193 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-12-07 15:46:47,194 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-12-07 15:46:47,195 INFO L87 Difference]: Start difference. First operand 13 states. Second operand 3 states. [2019-12-07 15:46:47,258 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-12-07 15:46:47,258 INFO L93 Difference]: Finished difference Result 25 states and 37 transitions. [2019-12-07 15:46:47,258 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-12-07 15:46:47,259 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 6 [2019-12-07 15:46:47,260 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-12-07 15:46:47,265 INFO L225 Difference]: With dead ends: 25 [2019-12-07 15:46:47,265 INFO L226 Difference]: Without dead ends: 12 [2019-12-07 15:46:47,267 INFO L630 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 [2019-12-07 15:46:47,279 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2019-12-07 15:46:47,287 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 11. [2019-12-07 15:46:47,288 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 11 states. [2019-12-07 15:46:47,288 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 14 transitions. [2019-12-07 15:46:47,289 INFO L78 Accepts]: Start accepts. Automaton has 11 states and 14 transitions. Word has length 6 [2019-12-07 15:46:47,289 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-12-07 15:46:47,289 INFO L462 AbstractCegarLoop]: Abstraction has 11 states and 14 transitions. [2019-12-07 15:46:47,289 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-12-07 15:46:47,289 INFO L276 IsEmpty]: Start isEmpty. Operand 11 states and 14 transitions. [2019-12-07 15:46:47,289 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2019-12-07 15:46:47,289 INFO L402 BasicCegarLoop]: Found error trace [2019-12-07 15:46:47,290 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2019-12-07 15:46:47,290 INFO L410 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-12-07 15:46:47,290 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-12-07 15:46:47,290 INFO L82 PathProgramCache]: Analyzing trace with hash -1908068044, now seen corresponding path program 1 times [2019-12-07 15:46:47,290 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-12-07 15:46:47,290 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1795246284] [2019-12-07 15:46:47,290 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-12-07 15:46:47,315 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 15:46:47,342 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-12-07 15:46:47,342 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1795246284] [2019-12-07 15:46:47,343 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1335935058] [2019-12-07 15:46:47,343 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_93502547-4684-4524-a5eb-cb02178a5159/bin/utaipan/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-12-07 15:46:47,389 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 15:46:47,390 INFO L264 TraceCheckSpWp]: Trace formula consists of 72 conjuncts, 5 conjunts are in the unsatisfiable core [2019-12-07 15:46:47,394 INFO L287 TraceCheckSpWp]: Computing forward predicates... [2019-12-07 15:46:47,410 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-12-07 15:46:47,411 INFO L329 TraceCheckSpWp]: Computing backward predicates... [2019-12-07 15:46:47,421 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-12-07 15:46:47,422 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1919222931] [2019-12-07 15:46:47,437 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2019-12-07 15:46:47,437 INFO L166 IcfgInterpreter]: Building call graph [2019-12-07 15:46:47,440 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-12-07 15:46:47,444 INFO L176 IcfgInterpreter]: Starting interpretation [2019-12-07 15:46:47,445 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-12-07 15:46:47,577 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-12-07 15:46:47,587 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-12-07 15:46:47,596 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-12-07 15:46:47,657 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-12-07 15:47:08,716 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-12-07 15:47:08,729 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-12-07 15:47:08,743 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-12-07 15:47:08,756 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-12-07 15:47:09,889 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-12-07 15:47:10,523 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-12-07 15:47:10,535 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-12-07 15:47:11,581 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-12-07 15:47:31,779 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-12-07 15:47:31,784 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-12-07 15:47:31,918 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-12-07 15:47:31,934 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-12-07 15:47:32,258 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-12-07 15:47:32,271 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-12-07 15:47:33,132 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-12-07 15:47:45,188 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-12-07 15:47:55,155 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-12-07 15:47:55,940 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-12-07 15:48:04,639 INFO L180 IcfgInterpreter]: Interpretation finished [2019-12-07 15:48:05,047 WARN L192 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 85 DAG size of output: 79 [2019-12-07 15:48:05,049 INFO L343 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-12-07 15:48:05,049 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-12-07 15:48:05,049 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 6 [2019-12-07 15:48:05,050 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1220477493] [2019-12-07 15:48:05,050 INFO L442 AbstractCegarLoop]: Interpolant automaton has 7 states [2019-12-07 15:48:05,050 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-12-07 15:48:05,050 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2019-12-07 15:48:05,051 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=115, Unknown=0, NotChecked=0, Total=156 [2019-12-07 15:48:05,051 INFO L87 Difference]: Start difference. First operand 11 states and 14 transitions. Second operand 7 states. [2019-12-07 15:48:05,201 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-12-07 15:48:05,202 INFO L93 Difference]: Finished difference Result 24 states and 32 transitions. [2019-12-07 15:48:05,202 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-12-07 15:48:05,202 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 8 [2019-12-07 15:48:05,202 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-12-07 15:48:05,203 INFO L225 Difference]: With dead ends: 24 [2019-12-07 15:48:05,203 INFO L226 Difference]: Without dead ends: 17 [2019-12-07 15:48:05,203 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 45 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=41, Invalid=115, Unknown=0, NotChecked=0, Total=156 [2019-12-07 15:48:05,204 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2019-12-07 15:48:05,205 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2019-12-07 15:48:05,205 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2019-12-07 15:48:05,206 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 20 transitions. [2019-12-07 15:48:05,206 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 20 transitions. Word has length 8 [2019-12-07 15:48:05,206 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-12-07 15:48:05,206 INFO L462 AbstractCegarLoop]: Abstraction has 17 states and 20 transitions. [2019-12-07 15:48:05,206 INFO L463 AbstractCegarLoop]: Interpolant automaton has 7 states. [2019-12-07 15:48:05,206 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 20 transitions. [2019-12-07 15:48:05,207 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2019-12-07 15:48:05,207 INFO L402 BasicCegarLoop]: Found error trace [2019-12-07 15:48:05,207 INFO L410 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1] [2019-12-07 15:48:05,407 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-12-07 15:48:05,408 INFO L410 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-12-07 15:48:05,408 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-12-07 15:48:05,408 INFO L82 PathProgramCache]: Analyzing trace with hash -1124747563, now seen corresponding path program 2 times [2019-12-07 15:48:05,408 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-12-07 15:48:05,409 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1986474972] [2019-12-07 15:48:05,409 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-12-07 15:48:05,447 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 15:48:05,498 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-12-07 15:48:05,498 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1986474972] [2019-12-07 15:48:05,498 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1697892732] [2019-12-07 15:48:05,498 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_93502547-4684-4524-a5eb-cb02178a5159/bin/utaipan/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-12-07 15:48:18,555 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2019-12-07 15:48:18,555 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-12-07 15:48:18,560 INFO L264 TraceCheckSpWp]: Trace formula consists of 168 conjuncts, 8 conjunts are in the unsatisfiable core [2019-12-07 15:48:18,561 INFO L287 TraceCheckSpWp]: Computing forward predicates... [2019-12-07 15:48:18,568 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-12-07 15:48:18,568 INFO L329 TraceCheckSpWp]: Computing backward predicates... [2019-12-07 15:48:18,589 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-12-07 15:48:18,590 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1317460039] [2019-12-07 15:48:18,591 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2019-12-07 15:48:18,591 INFO L166 IcfgInterpreter]: Building call graph [2019-12-07 15:48:18,591 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-12-07 15:48:18,591 INFO L176 IcfgInterpreter]: Starting interpretation [2019-12-07 15:48:18,591 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-12-07 15:48:18,637 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-12-07 15:48:19,055 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-12-07 15:48:19,347 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-12-07 15:48:19,354 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-12-07 15:48:20,544 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-12-07 15:48:20,560 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-12-07 15:48:20,574 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-12-07 15:48:20,988 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-12-07 15:48:21,031 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-12-07 15:48:40,762 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-12-07 15:48:41,151 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-12-07 15:48:41,162 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-12-07 15:48:59,585 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-12-07 15:48:59,590 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-12-07 15:49:07,794 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-12-07 15:49:14,606 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-12-07 15:49:15,029 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-12-07 15:49:15,045 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-12-07 15:49:33,408 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-12-07 15:49:33,419 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-12-07 15:49:35,965 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-12-07 15:49:45,494 INFO L180 IcfgInterpreter]: Interpretation finished [2019-12-07 15:49:45,906 WARN L192 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 85 DAG size of output: 79 [2019-12-07 15:49:45,907 INFO L343 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-12-07 15:49:45,907 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-12-07 15:49:45,907 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 7 [2019-12-07 15:49:45,908 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1958289242] [2019-12-07 15:49:45,908 INFO L442 AbstractCegarLoop]: Interpolant automaton has 8 states [2019-12-07 15:49:45,908 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-12-07 15:49:45,908 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2019-12-07 15:49:45,908 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=134, Unknown=0, NotChecked=0, Total=182 [2019-12-07 15:49:45,908 INFO L87 Difference]: Start difference. First operand 17 states and 20 transitions. Second operand 8 states. [2019-12-07 15:49:46,097 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-12-07 15:49:46,098 INFO L93 Difference]: Finished difference Result 26 states and 32 transitions. [2019-12-07 15:49:46,098 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-12-07 15:49:46,098 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 14 [2019-12-07 15:49:46,098 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-12-07 15:49:46,098 INFO L225 Difference]: With dead ends: 26 [2019-12-07 15:49:46,098 INFO L226 Difference]: Without dead ends: 19 [2019-12-07 15:49:46,099 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 29 SyntacticMatches, 5 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 66 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=48, Invalid=134, Unknown=0, NotChecked=0, Total=182 [2019-12-07 15:49:46,099 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2019-12-07 15:49:46,100 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2019-12-07 15:49:46,101 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2019-12-07 15:49:46,101 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 22 transitions. [2019-12-07 15:49:46,101 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 22 transitions. Word has length 14 [2019-12-07 15:49:46,101 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-12-07 15:49:46,101 INFO L462 AbstractCegarLoop]: Abstraction has 19 states and 22 transitions. [2019-12-07 15:49:46,101 INFO L463 AbstractCegarLoop]: Interpolant automaton has 8 states. [2019-12-07 15:49:46,101 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 22 transitions. [2019-12-07 15:49:46,102 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2019-12-07 15:49:46,102 INFO L402 BasicCegarLoop]: Found error trace [2019-12-07 15:49:46,102 INFO L410 BasicCegarLoop]: trace histogram [5, 5, 1, 1, 1, 1, 1, 1] [2019-12-07 15:49:46,302 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-12-07 15:49:46,302 INFO L410 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-12-07 15:49:46,303 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-12-07 15:49:46,303 INFO L82 PathProgramCache]: Analyzing trace with hash 1594824160, now seen corresponding path program 3 times [2019-12-07 15:49:46,303 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-12-07 15:49:46,303 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1789727697] [2019-12-07 15:49:46,304 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-12-07 15:49:46,525 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2019-12-07 15:49:46,728 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2019-12-07 15:49:46,747 INFO L174 FreeRefinementEngine]: Strategy SIFA_TAIPAN found a feasible trace [2019-12-07 15:49:46,747 INFO L475 BasicCegarLoop]: Counterexample might be feasible [2019-12-07 15:49:46,772 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 07.12 03:49:46 BoogieIcfgContainer [2019-12-07 15:49:46,772 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2019-12-07 15:49:46,772 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2019-12-07 15:49:46,772 INFO L271 PluginConnector]: Initializing Witness Printer... [2019-12-07 15:49:46,772 INFO L275 PluginConnector]: Witness Printer initialized [2019-12-07 15:49:46,773 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.12 03:46:47" (3/4) ... [2019-12-07 15:49:46,774 INFO L131 WitnessPrinter]: Generating witness for reachability counterexample [2019-12-07 15:49:46,811 INFO L141 WitnessManager]: Wrote witness to /tmp/vcloud-vcloud-master/worker/run_dir_93502547-4684-4524-a5eb-cb02178a5159/bin/utaipan/witness.graphml [2019-12-07 15:49:46,811 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2019-12-07 15:49:46,812 INFO L168 Benchmark]: Toolchain (without parser) took 180562.66 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 121.1 MB). Free memory was 938.3 MB in the beginning and 1.0 GB in the end (delta: -106.0 MB). Peak memory consumption was 15.1 MB. Max. memory is 11.5 GB. [2019-12-07 15:49:46,812 INFO L168 Benchmark]: CDTParser took 0.13 ms. Allocated memory is still 1.0 GB. Free memory is still 956.6 MB. There was no memory consumed. Max. memory is 11.5 GB. [2019-12-07 15:49:46,813 INFO L168 Benchmark]: CACSL2BoogieTranslator took 330.28 ms. Allocated memory was 1.0 GB in the beginning and 1.1 GB in the end (delta: 97.5 MB). Free memory was 938.3 MB in the beginning and 1.1 GB in the end (delta: -138.9 MB). Peak memory consumption was 20.4 MB. Max. memory is 11.5 GB. [2019-12-07 15:49:46,813 INFO L168 Benchmark]: Boogie Procedure Inliner took 29.99 ms. Allocated memory is still 1.1 GB. Free memory was 1.1 GB in the beginning and 1.1 GB in the end (delta: 2.2 MB). Peak memory consumption was 2.2 MB. Max. memory is 11.5 GB. [2019-12-07 15:49:46,813 INFO L168 Benchmark]: Boogie Preprocessor took 20.57 ms. Allocated memory is still 1.1 GB. Free memory was 1.1 GB in the beginning and 1.1 GB in the end (delta: 2.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 11.5 GB. [2019-12-07 15:49:46,813 INFO L168 Benchmark]: RCFGBuilder took 394.84 ms. Allocated memory is still 1.1 GB. Free memory was 1.1 GB in the beginning and 1.0 GB in the end (delta: 50.6 MB). Peak memory consumption was 50.6 MB. Max. memory is 11.5 GB. [2019-12-07 15:49:46,813 INFO L168 Benchmark]: TraceAbstraction took 179743.98 ms. Allocated memory was 1.1 GB in the beginning and 1.2 GB in the end (delta: 23.6 MB). Free memory was 1.0 GB in the beginning and 1.1 GB in the end (delta: -30.4 MB). Peak memory consumption was 241.4 MB. Max. memory is 11.5 GB. [2019-12-07 15:49:46,814 INFO L168 Benchmark]: Witness Printer took 39.32 ms. Allocated memory is still 1.2 GB. Free memory was 1.1 GB in the beginning and 1.0 GB in the end (delta: 8.2 MB). Peak memory consumption was 8.2 MB. Max. memory is 11.5 GB. [2019-12-07 15:49:46,815 INFO L335 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.13 ms. Allocated memory is still 1.0 GB. Free memory is still 956.6 MB. There was no memory consumed. Max. memory is 11.5 GB. * CACSL2BoogieTranslator took 330.28 ms. Allocated memory was 1.0 GB in the beginning and 1.1 GB in the end (delta: 97.5 MB). Free memory was 938.3 MB in the beginning and 1.1 GB in the end (delta: -138.9 MB). Peak memory consumption was 20.4 MB. Max. memory is 11.5 GB. * Boogie Procedure Inliner took 29.99 ms. Allocated memory is still 1.1 GB. Free memory was 1.1 GB in the beginning and 1.1 GB in the end (delta: 2.2 MB). Peak memory consumption was 2.2 MB. Max. memory is 11.5 GB. * Boogie Preprocessor took 20.57 ms. Allocated memory is still 1.1 GB. Free memory was 1.1 GB in the beginning and 1.1 GB in the end (delta: 2.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 11.5 GB. * RCFGBuilder took 394.84 ms. Allocated memory is still 1.1 GB. Free memory was 1.1 GB in the beginning and 1.0 GB in the end (delta: 50.6 MB). Peak memory consumption was 50.6 MB. Max. memory is 11.5 GB. * TraceAbstraction took 179743.98 ms. Allocated memory was 1.1 GB in the beginning and 1.2 GB in the end (delta: 23.6 MB). Free memory was 1.0 GB in the beginning and 1.1 GB in the end (delta: -30.4 MB). Peak memory consumption was 241.4 MB. Max. memory is 11.5 GB. * Witness Printer took 39.32 ms. Allocated memory is still 1.2 GB. Free memory was 1.1 GB in the beginning and 1.0 GB in the end (delta: 8.2 MB). Peak memory consumption was 8.2 MB. Max. memory is 11.5 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 605]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L588] const int len = 5; [L568] DLL head = ((void *)0); [L569] COND TRUE len > 0 [L570] DLL new_head = (DLL) malloc(sizeof(struct node)); [L571] COND FALSE !(((void *)0) == new_head) [L574] new_head->data_0 = 0 [L575] new_head->data_1 = 0 [L576] EXPR __VERIFIER_nondet_int() == len? 1 : 0 [L576] new_head->data_2 = __VERIFIER_nondet_int() == len? 1 : 0 [L577] new_head->next = head [L578] new_head->prev = ((void *)0) [L579] COND FALSE !(\read(head)) [L582] head = new_head [L583] len-- [L569] COND TRUE len > 0 [L570] DLL new_head = (DLL) malloc(sizeof(struct node)); [L571] COND FALSE !(((void *)0) == new_head) [L574] new_head->data_0 = 0 [L575] new_head->data_1 = 0 [L576] EXPR __VERIFIER_nondet_int() == len? 1 : 0 [L576] new_head->data_2 = __VERIFIER_nondet_int() == len? 1 : 0 [L577] new_head->next = head [L578] new_head->prev = ((void *)0) [L579] COND TRUE \read(head) [L580] head->prev = new_head [L582] head = new_head [L583] len-- [L569] COND TRUE len > 0 [L570] DLL new_head = (DLL) malloc(sizeof(struct node)); [L571] COND FALSE !(((void *)0) == new_head) [L574] new_head->data_0 = 0 [L575] new_head->data_1 = 0 [L576] EXPR __VERIFIER_nondet_int() == len? 1 : 0 [L576] new_head->data_2 = __VERIFIER_nondet_int() == len? 1 : 0 [L577] new_head->next = head [L578] new_head->prev = ((void *)0) [L579] COND TRUE \read(head) [L580] head->prev = new_head [L582] head = new_head [L583] len-- [L569] COND TRUE len > 0 [L570] DLL new_head = (DLL) malloc(sizeof(struct node)); [L571] COND FALSE !(((void *)0) == new_head) [L574] new_head->data_0 = 0 [L575] new_head->data_1 = 0 [L576] EXPR __VERIFIER_nondet_int() == len? 1 : 0 [L576] new_head->data_2 = __VERIFIER_nondet_int() == len? 1 : 0 [L577] new_head->next = head [L578] new_head->prev = ((void *)0) [L579] COND TRUE \read(head) [L580] head->prev = new_head [L582] head = new_head [L583] len-- [L569] COND TRUE len > 0 [L570] DLL new_head = (DLL) malloc(sizeof(struct node)); [L571] COND FALSE !(((void *)0) == new_head) [L574] new_head->data_0 = 0 [L575] new_head->data_1 = 0 [L576] EXPR __VERIFIER_nondet_int() == len? 1 : 0 [L576] new_head->data_2 = __VERIFIER_nondet_int() == len? 1 : 0 [L577] new_head->next = head [L578] new_head->prev = ((void *)0) [L579] COND TRUE \read(head) [L580] head->prev = new_head [L582] head = new_head [L583] len-- [L569] COND FALSE !(len > 0) [L585] return head; [L589] DLL head = dll_create(len); [L590] head->next [L590] COND TRUE head->next [L591] EXPR head->data_0 [L591] EXPR 0 != head->data_0 || 0 != head->data_1 [L591] EXPR head->data_1 [L591] EXPR 0 != head->data_0 || 0 != head->data_1 [L591] 0 != head->data_0 || 0 != head->data_1 || 0 != head->data_2 [L591] EXPR head->data_2 [L591] 0 != head->data_0 || 0 != head->data_1 || 0 != head->data_2 [L591] COND TRUE 0 != head->data_0 || 0 != head->data_1 || 0 != head->data_2 [L605] __VERIFIER_error() - StatisticsResult: Ultimate Automizer benchmark data CFG has 1 procedures, 13 locations, 1 error locations. Result: UNSAFE, OverallTime: 179.6s, OverallIterations: 4, TraceHistogramMax: 5, AutomataDifference: 0.4s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 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, 44 SyntacticMatches, 5 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 111 ImplicationChecksByTransitivity, 0.8s 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, 13.3s SatisfiabilityAnalysisTime, 0.1s InterpolantComputationTime, 66 NumberOfCodeBlocks, 66 NumberOfCodeBlocksAsserted, 10 NumberOfCheckSat, 65 ConstructedInterpolants, 0 QuantifiedInterpolants, 1517 SizeOfPredicates, 6 NumberOfNonLiveVariables, 240 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, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! Received shutdown request...