./Ultimate.py --spec ../sv-benchmarks/c/properties/unreach-call.prp --file ../sv-benchmarks/c/list-properties/alternating_list-2.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 54858612 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/config -Xmx15G -Xms4m -jar /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data -tc /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/AutomizerReach.xml -i ../sv-benchmarks/c/list-properties/alternating_list-2.i -s /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Automizer --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash da856cb29218eae000c82400da3ef1c667e9f55c .......................................................................................................................................................................................................................................................................................................................................... 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 0.2.0-5485861 [2020-10-25 22:03:20,683 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-10-25 22:03:20,686 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-10-25 22:03:20,744 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-10-25 22:03:20,745 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-10-25 22:03:20,750 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-10-25 22:03:20,753 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-10-25 22:03:20,760 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-10-25 22:03:20,764 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-10-25 22:03:20,772 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-10-25 22:03:20,773 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-10-25 22:03:20,775 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-10-25 22:03:20,775 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-10-25 22:03:20,776 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-10-25 22:03:20,777 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-10-25 22:03:20,779 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-10-25 22:03:20,780 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-10-25 22:03:20,781 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-10-25 22:03:20,783 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-10-25 22:03:20,785 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-10-25 22:03:20,787 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-10-25 22:03:20,789 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-10-25 22:03:20,790 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-10-25 22:03:20,791 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-10-25 22:03:20,794 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-10-25 22:03:20,795 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-10-25 22:03:20,795 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-10-25 22:03:20,797 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-10-25 22:03:20,797 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-10-25 22:03:20,798 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-10-25 22:03:20,799 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-10-25 22:03:20,800 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-10-25 22:03:20,801 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-10-25 22:03:20,802 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-10-25 22:03:20,810 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-10-25 22:03:20,810 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-10-25 22:03:20,812 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-10-25 22:03:20,812 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-10-25 22:03:20,813 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-10-25 22:03:20,814 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-10-25 22:03:20,815 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-10-25 22:03:20,816 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Default.epf [2020-10-25 22:03:20,846 INFO L113 SettingsManager]: Loading preferences was successful [2020-10-25 22:03:20,846 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-10-25 22:03:20,848 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-10-25 22:03:20,848 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-10-25 22:03:20,849 INFO L138 SettingsManager]: * Use SBE=true [2020-10-25 22:03:20,849 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-10-25 22:03:20,849 INFO L138 SettingsManager]: * sizeof long=4 [2020-10-25 22:03:20,850 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-10-25 22:03:20,850 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-10-25 22:03:20,850 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-10-25 22:03:20,850 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-10-25 22:03:20,851 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-10-25 22:03:20,851 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-10-25 22:03:20,851 INFO L138 SettingsManager]: * sizeof long double=12 [2020-10-25 22:03:20,851 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-10-25 22:03:20,852 INFO L138 SettingsManager]: * Use constant arrays=true [2020-10-25 22:03:20,852 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-10-25 22:03:20,852 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-10-25 22:03:20,853 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-10-25 22:03:20,853 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-10-25 22:03:20,853 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-10-25 22:03:20,854 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-10-25 22:03:20,854 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-10-25 22:03:20,854 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-10-25 22:03:20,855 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-10-25 22:03:20,855 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-10-25 22:03:20,855 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-10-25 22:03:20,855 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-10-25 22:03:20,856 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-10-25 22:03:20,856 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> da856cb29218eae000c82400da3ef1c667e9f55c [2020-10-25 22:03:21,272 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-10-25 22:03:21,313 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-10-25 22:03:21,319 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-10-25 22:03:21,321 INFO L271 PluginConnector]: Initializing CDTParser... [2020-10-25 22:03:21,322 INFO L275 PluginConnector]: CDTParser initialized [2020-10-25 22:03:21,323 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/list-properties/alternating_list-2.i [2020-10-25 22:03:21,413 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/583ba7554/8572f44224ac4edd950f88c15a57374c/FLAG379a72694 [2020-10-25 22:03:22,232 INFO L306 CDTParser]: Found 1 translation units. [2020-10-25 22:03:22,233 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/list-properties/alternating_list-2.i [2020-10-25 22:03:22,261 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/583ba7554/8572f44224ac4edd950f88c15a57374c/FLAG379a72694 [2020-10-25 22:03:22,462 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/583ba7554/8572f44224ac4edd950f88c15a57374c [2020-10-25 22:03:22,474 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-10-25 22:03:22,498 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2020-10-25 22:03:22,506 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-10-25 22:03:22,507 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-10-25 22:03:22,511 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-10-25 22:03:22,512 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.10 10:03:22" (1/1) ... [2020-10-25 22:03:22,516 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@ebf6261 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.10 10:03:22, skipping insertion in model container [2020-10-25 22:03:22,516 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.10 10:03:22" (1/1) ... [2020-10-25 22:03:22,525 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-10-25 22:03:22,573 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-10-25 22:03:22,928 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-10-25 22:03:22,940 INFO L203 MainTranslator]: Completed pre-run [2020-10-25 22:03:22,996 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-10-25 22:03:23,072 INFO L208 MainTranslator]: Completed translation [2020-10-25 22:03:23,072 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.10 10:03:23 WrapperNode [2020-10-25 22:03:23,073 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-10-25 22:03:23,076 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2020-10-25 22:03:23,077 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2020-10-25 22:03:23,077 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2020-10-25 22:03:23,092 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.10 10:03:23" (1/1) ... [2020-10-25 22:03:23,117 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.10 10:03:23" (1/1) ... [2020-10-25 22:03:23,141 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2020-10-25 22:03:23,142 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-10-25 22:03:23,143 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-10-25 22:03:23,143 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-10-25 22:03:23,153 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.10 10:03:23" (1/1) ... [2020-10-25 22:03:23,154 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.10 10:03:23" (1/1) ... [2020-10-25 22:03:23,158 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.10 10:03:23" (1/1) ... [2020-10-25 22:03:23,158 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.10 10:03:23" (1/1) ... [2020-10-25 22:03:23,166 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.10 10:03:23" (1/1) ... [2020-10-25 22:03:23,171 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.10 10:03:23" (1/1) ... [2020-10-25 22:03:23,174 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.10 10:03:23" (1/1) ... [2020-10-25 22:03:23,178 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-10-25 22:03:23,179 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-10-25 22:03:23,179 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-10-25 22:03:23,179 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-10-25 22:03:23,184 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.10 10:03:23" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-10-25 22:03:23,278 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-10-25 22:03:23,279 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-10-25 22:03:23,279 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2020-10-25 22:03:23,281 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2020-10-25 22:03:23,281 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-10-25 22:03:23,281 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2020-10-25 22:03:23,282 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-10-25 22:03:23,282 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-10-25 22:03:23,283 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-10-25 22:03:23,284 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-10-25 22:03:23,790 INFO L293 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-10-25 22:03:23,791 INFO L298 CfgBuilder]: Removed 13 assume(true) statements. [2020-10-25 22:03:23,793 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.10 10:03:23 BoogieIcfgContainer [2020-10-25 22:03:23,793 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-10-25 22:03:23,795 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-10-25 22:03:23,795 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-10-25 22:03:23,799 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-10-25 22:03:23,799 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 25.10 10:03:22" (1/3) ... [2020-10-25 22:03:23,800 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@45a17607 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.10 10:03:23, skipping insertion in model container [2020-10-25 22:03:23,801 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.10 10:03:23" (2/3) ... [2020-10-25 22:03:23,801 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@45a17607 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.10 10:03:23, skipping insertion in model container [2020-10-25 22:03:23,801 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.10 10:03:23" (3/3) ... [2020-10-25 22:03:23,803 INFO L111 eAbstractionObserver]: Analyzing ICFG alternating_list-2.i [2020-10-25 22:03:23,819 INFO L164 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-10-25 22:03:23,825 INFO L176 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-10-25 22:03:23,842 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-10-25 22:03:23,874 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-10-25 22:03:23,874 INFO L378 AbstractCegarLoop]: Hoare is true [2020-10-25 22:03:23,875 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-10-25 22:03:23,875 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-10-25 22:03:23,875 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-10-25 22:03:23,876 INFO L382 AbstractCegarLoop]: Difference is false [2020-10-25 22:03:23,876 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-10-25 22:03:23,876 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-10-25 22:03:23,895 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states. [2020-10-25 22:03:23,902 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-10-25 22:03:23,902 INFO L414 BasicCegarLoop]: Found error trace [2020-10-25 22:03:23,903 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-25 22:03:23,904 INFO L429 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-25 22:03:23,911 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-25 22:03:23,911 INFO L82 PathProgramCache]: Analyzing trace with hash -761417432, now seen corresponding path program 1 times [2020-10-25 22:03:23,923 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-25 22:03:23,924 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [191763409] [2020-10-25 22:03:23,924 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-25 22:03:24,083 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-25 22:03:24,158 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-25 22:03:24,159 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [191763409] [2020-10-25 22:03:24,160 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-25 22:03:24,160 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-10-25 22:03:24,163 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [698320766] [2020-10-25 22:03:24,169 INFO L461 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-10-25 22:03:24,170 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-10-25 22:03:24,190 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-10-25 22:03:24,192 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-10-25 22:03:24,195 INFO L87 Difference]: Start difference. First operand 31 states. Second operand 2 states. [2020-10-25 22:03:24,221 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-25 22:03:24,227 INFO L93 Difference]: Finished difference Result 49 states and 68 transitions. [2020-10-25 22:03:24,227 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-10-25 22:03:24,229 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 13 [2020-10-25 22:03:24,229 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-25 22:03:24,239 INFO L225 Difference]: With dead ends: 49 [2020-10-25 22:03:24,239 INFO L226 Difference]: Without dead ends: 21 [2020-10-25 22:03:24,243 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-10-25 22:03:24,265 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-10-25 22:03:24,281 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-10-25 22:03:24,283 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-10-25 22:03:24,284 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2020-10-25 22:03:24,285 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 13 [2020-10-25 22:03:24,286 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-25 22:03:24,286 INFO L481 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2020-10-25 22:03:24,286 INFO L482 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-10-25 22:03:24,287 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2020-10-25 22:03:24,287 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-10-25 22:03:24,288 INFO L414 BasicCegarLoop]: Found error trace [2020-10-25 22:03:24,288 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-25 22:03:24,288 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-10-25 22:03:24,289 INFO L429 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-25 22:03:24,289 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-25 22:03:24,290 INFO L82 PathProgramCache]: Analyzing trace with hash 1139776784, now seen corresponding path program 1 times [2020-10-25 22:03:24,290 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-25 22:03:24,290 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [209586372] [2020-10-25 22:03:24,291 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-25 22:03:24,315 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-25 22:03:24,400 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-25 22:03:24,401 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [209586372] [2020-10-25 22:03:24,401 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-25 22:03:24,401 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-10-25 22:03:24,401 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1372138789] [2020-10-25 22:03:24,403 INFO L461 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-10-25 22:03:24,404 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-10-25 22:03:24,405 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-10-25 22:03:24,405 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-10-25 22:03:24,405 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand 5 states. [2020-10-25 22:03:24,548 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-25 22:03:24,548 INFO L93 Difference]: Finished difference Result 50 states and 60 transitions. [2020-10-25 22:03:24,550 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-10-25 22:03:24,550 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 14 [2020-10-25 22:03:24,550 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-25 22:03:24,551 INFO L225 Difference]: With dead ends: 50 [2020-10-25 22:03:24,552 INFO L226 Difference]: Without dead ends: 37 [2020-10-25 22:03:24,553 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2020-10-25 22:03:24,554 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-10-25 22:03:24,558 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 23. [2020-10-25 22:03:24,567 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-10-25 22:03:24,568 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 27 transitions. [2020-10-25 22:03:24,568 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 27 transitions. Word has length 14 [2020-10-25 22:03:24,568 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-25 22:03:24,569 INFO L481 AbstractCegarLoop]: Abstraction has 23 states and 27 transitions. [2020-10-25 22:03:24,569 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-10-25 22:03:24,569 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 27 transitions. [2020-10-25 22:03:24,570 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-10-25 22:03:24,570 INFO L414 BasicCegarLoop]: Found error trace [2020-10-25 22:03:24,570 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-25 22:03:24,571 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-10-25 22:03:24,571 INFO L429 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-25 22:03:24,572 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-25 22:03:24,572 INFO L82 PathProgramCache]: Analyzing trace with hash -95727365, now seen corresponding path program 1 times [2020-10-25 22:03:24,572 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-25 22:03:24,573 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [999370099] [2020-10-25 22:03:24,573 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-25 22:03:24,611 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-25 22:03:24,612 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-25 22:03:24,645 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-25 22:03:24,646 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-25 22:03:24,680 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-10-25 22:03:24,681 INFO L523 BasicCegarLoop]: Counterexample might be feasible [2020-10-25 22:03:24,681 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-10-25 22:03:24,729 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 25.10 10:03:24 BoogieIcfgContainer [2020-10-25 22:03:24,730 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-10-25 22:03:24,731 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2020-10-25 22:03:24,732 INFO L271 PluginConnector]: Initializing Witness Printer... [2020-10-25 22:03:24,732 INFO L275 PluginConnector]: Witness Printer initialized [2020-10-25 22:03:24,733 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.10 10:03:23" (3/4) ... [2020-10-25 22:03:24,737 INFO L131 WitnessPrinter]: Generating witness for reachability counterexample [2020-10-25 22:03:24,833 INFO L141 WitnessManager]: Wrote witness to /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/witness.graphml [2020-10-25 22:03:24,834 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2020-10-25 22:03:24,837 INFO L168 Benchmark]: Toolchain (without parser) took 2357.97 ms. Allocated memory was 44.0 MB in the beginning and 54.5 MB in the end (delta: 10.5 MB). Free memory was 29.0 MB in the beginning and 26.5 MB in the end (delta: 2.5 MB). Peak memory consumption was 11.6 MB. Max. memory is 16.1 GB. [2020-10-25 22:03:24,842 INFO L168 Benchmark]: CDTParser took 0.28 ms. Allocated memory is still 35.7 MB. Free memory was 21.9 MB in the beginning and 21.9 MB in the end (delta: 38.2 kB). There was no memory consumed. Max. memory is 16.1 GB. [2020-10-25 22:03:24,843 INFO L168 Benchmark]: CACSL2BoogieTranslator took 567.90 ms. Allocated memory is still 44.0 MB. Free memory was 28.5 MB in the beginning and 17.6 MB in the end (delta: 10.8 MB). Peak memory consumption was 14.1 MB. Max. memory is 16.1 GB. [2020-10-25 22:03:24,845 INFO L168 Benchmark]: Boogie Procedure Inliner took 65.39 ms. Allocated memory is still 44.0 MB. Free memory was 17.6 MB in the beginning and 26.4 MB in the end (delta: -8.8 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2020-10-25 22:03:24,848 INFO L168 Benchmark]: Boogie Preprocessor took 35.76 ms. Allocated memory is still 44.0 MB. Free memory was 26.4 MB in the beginning and 24.9 MB in the end (delta: 1.5 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2020-10-25 22:03:24,850 INFO L168 Benchmark]: RCFGBuilder took 614.47 ms. Allocated memory was 44.0 MB in the beginning and 54.5 MB in the end (delta: 10.5 MB). Free memory was 24.9 MB in the beginning and 36.1 MB in the end (delta: -11.2 MB). Peak memory consumption was 9.6 MB. Max. memory is 16.1 GB. [2020-10-25 22:03:24,851 INFO L168 Benchmark]: TraceAbstraction took 934.82 ms. Allocated memory is still 54.5 MB. Free memory was 35.8 MB in the beginning and 29.4 MB in the end (delta: 6.4 MB). Peak memory consumption was 7.1 MB. Max. memory is 16.1 GB. [2020-10-25 22:03:24,852 INFO L168 Benchmark]: Witness Printer took 103.25 ms. Allocated memory is still 54.5 MB. Free memory was 29.0 MB in the beginning and 26.5 MB in the end (delta: 2.5 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2020-10-25 22:03:24,859 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.28 ms. Allocated memory is still 35.7 MB. Free memory was 21.9 MB in the beginning and 21.9 MB in the end (delta: 38.2 kB). There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 567.90 ms. Allocated memory is still 44.0 MB. Free memory was 28.5 MB in the beginning and 17.6 MB in the end (delta: 10.8 MB). Peak memory consumption was 14.1 MB. Max. memory is 16.1 GB. * Boogie Procedure Inliner took 65.39 ms. Allocated memory is still 44.0 MB. Free memory was 17.6 MB in the beginning and 26.4 MB in the end (delta: -8.8 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * Boogie Preprocessor took 35.76 ms. Allocated memory is still 44.0 MB. Free memory was 26.4 MB in the beginning and 24.9 MB in the end (delta: 1.5 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * RCFGBuilder took 614.47 ms. Allocated memory was 44.0 MB in the beginning and 54.5 MB in the end (delta: 10.5 MB). Free memory was 24.9 MB in the beginning and 36.1 MB in the end (delta: -11.2 MB). Peak memory consumption was 9.6 MB. Max. memory is 16.1 GB. * TraceAbstraction took 934.82 ms. Allocated memory is still 54.5 MB. Free memory was 35.8 MB in the beginning and 29.4 MB in the end (delta: 6.4 MB). Peak memory consumption was 7.1 MB. Max. memory is 16.1 GB. * Witness Printer took 103.25 ms. Allocated memory is still 54.5 MB. Free memory was 29.0 MB in the beginning and 26.5 MB in the end (delta: 2.5 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 12]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L532] int flag = 1; [L533] List a = (List) malloc(sizeof(struct node)); [L534] COND FALSE !(a == 0) [L535] List t; [L536] List p = a; [L537] COND TRUE __VERIFIER_nondet_int() [L538] COND TRUE \read(flag) [L539] p->h = 2 [L540] flag = 0 [L545] t = (List) malloc(sizeof(struct node)) [L546] COND FALSE !(t == 0) [L547] p->n = t [L548] EXPR p->n [L548] p = p->n [L537] COND FALSE !(__VERIFIER_nondet_int()) [L550] p->h = 3 [L551] p = a [L552] flag = 1 [L553] EXPR p->h [L553] COND TRUE p->h != 3 [L554] COND TRUE \read(flag) [L555] flag = 0 [L556] EXPR p->h [L556] COND TRUE p->h != 1 [L12] COND FALSE !(0) [L12] __assert_fail ("0", "alternating_list-2.c", 3, __extension__ __PRETTY_FUNCTION__) - StatisticsResult: Ultimate Automizer benchmark data CFG has 1 procedures, 31 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 0.8s, OverallIterations: 3, TraceHistogramMax: 2, AutomataDifference: 0.2s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 54 SDtfs, 18 SDslu, 43 SDs, 0 SdLazy, 38 SolverSat, 2 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.0s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 9 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=31occurred in iteration=0, 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, 2 MinimizatonAttempts, 14 StatesRemovedByMinimization, 1 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.0s SatisfiabilityAnalysisTime, 0.1s InterpolantComputationTime, 47 NumberOfCodeBlocks, 47 NumberOfCodeBlocksAsserted, 3 NumberOfCheckSat, 25 ConstructedInterpolants, 0 QuantifiedInterpolants, 651 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 2 InterpolantComputations, 2 PerfectInterpolantSequences, 0/0 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...