/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data -tc config/AutomizerReach.xml -s config/svcomp-Reach-64bit-Automizer_Default.epf -i ../sv-benchmarks/c/list-properties/alternating_list-2.i -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-4f750a8 [2020-12-22 03:47:44,134 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-12-22 03:47:44,136 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-12-22 03:47:44,175 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-12-22 03:47:44,176 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-12-22 03:47:44,177 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-12-22 03:47:44,179 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-12-22 03:47:44,182 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-12-22 03:47:44,184 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-12-22 03:47:44,185 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-12-22 03:47:44,186 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-12-22 03:47:44,188 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-12-22 03:47:44,189 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-12-22 03:47:44,190 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-12-22 03:47:44,191 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-12-22 03:47:44,193 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-12-22 03:47:44,194 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-12-22 03:47:44,204 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-12-22 03:47:44,206 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-12-22 03:47:44,209 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-12-22 03:47:44,211 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-12-22 03:47:44,216 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-12-22 03:47:44,217 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-12-22 03:47:44,218 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-12-22 03:47:44,228 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-12-22 03:47:44,233 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-12-22 03:47:44,233 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-12-22 03:47:44,235 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-12-22 03:47:44,236 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-12-22 03:47:44,237 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-12-22 03:47:44,237 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-12-22 03:47:44,238 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-12-22 03:47:44,238 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-12-22 03:47:44,239 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-12-22 03:47:44,240 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-12-22 03:47:44,241 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-12-22 03:47:44,242 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-64bit-Automizer_Default.epf [2020-12-22 03:47:44,269 INFO L113 SettingsManager]: Loading preferences was successful [2020-12-22 03:47:44,269 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-12-22 03:47:44,270 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-12-22 03:47:44,271 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-12-22 03:47:44,271 INFO L138 SettingsManager]: * Use SBE=true [2020-12-22 03:47:44,271 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-12-22 03:47:44,271 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-12-22 03:47:44,271 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-12-22 03:47:44,272 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-12-22 03:47:44,272 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-12-22 03:47:44,272 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-12-22 03:47:44,272 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-12-22 03:47:44,273 INFO L138 SettingsManager]: * Use constant arrays=true [2020-12-22 03:47:44,273 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-12-22 03:47:44,273 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-12-22 03:47:44,273 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-12-22 03:47:44,274 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-12-22 03:47:44,274 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-12-22 03:47:44,274 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-12-22 03:47:44,274 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-12-22 03:47:44,274 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-12-22 03:47:44,275 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-12-22 03:47:44,275 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-12-22 03:47:44,275 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-12-22 03:47:44,275 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-12-22 03:47:44,276 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2020-12-22 03:47:44,641 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-12-22 03:47:44,673 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-12-22 03:47:44,677 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-12-22 03:47:44,679 INFO L271 PluginConnector]: Initializing CDTParser... [2020-12-22 03:47:44,679 INFO L275 PluginConnector]: CDTParser initialized [2020-12-22 03:47:44,680 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/list-properties/alternating_list-2.i [2020-12-22 03:47:44,769 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/38f9377a4/19af970fc96d4787bab65031b23c3886/FLAG93ff0e0e2 [2020-12-22 03:47:45,513 INFO L306 CDTParser]: Found 1 translation units. [2020-12-22 03:47:45,513 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/list-properties/alternating_list-2.i [2020-12-22 03:47:45,534 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/38f9377a4/19af970fc96d4787bab65031b23c3886/FLAG93ff0e0e2 [2020-12-22 03:47:45,766 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/38f9377a4/19af970fc96d4787bab65031b23c3886 [2020-12-22 03:47:45,769 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-12-22 03:47:45,771 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2020-12-22 03:47:45,773 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-12-22 03:47:45,773 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-12-22 03:47:45,777 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-12-22 03:47:45,778 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.12 03:47:45" (1/1) ... [2020-12-22 03:47:45,780 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@628dc194 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 03:47:45, skipping insertion in model container [2020-12-22 03:47:45,780 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.12 03:47:45" (1/1) ... [2020-12-22 03:47:45,789 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-12-22 03:47:45,829 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-12-22 03:47:46,268 WARN L226 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/list-properties/alternating_list-2.i[23574,23587] [2020-12-22 03:47:46,276 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-22 03:47:46,289 INFO L203 MainTranslator]: Completed pre-run [2020-12-22 03:47:46,383 WARN L226 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/list-properties/alternating_list-2.i[23574,23587] [2020-12-22 03:47:46,391 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-22 03:47:46,470 INFO L208 MainTranslator]: Completed translation [2020-12-22 03:47:46,471 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 03:47:46 WrapperNode [2020-12-22 03:47:46,471 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-12-22 03:47:46,473 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2020-12-22 03:47:46,473 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2020-12-22 03:47:46,473 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2020-12-22 03:47:46,483 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 03:47:46" (1/1) ... [2020-12-22 03:47:46,527 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 03:47:46" (1/1) ... [2020-12-22 03:47:46,570 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2020-12-22 03:47:46,574 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-12-22 03:47:46,575 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-12-22 03:47:46,575 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-12-22 03:47:46,587 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 03:47:46" (1/1) ... [2020-12-22 03:47:46,588 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 03:47:46" (1/1) ... [2020-12-22 03:47:46,604 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 03:47:46" (1/1) ... [2020-12-22 03:47:46,605 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 03:47:46" (1/1) ... [2020-12-22 03:47:46,620 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 03:47:46" (1/1) ... [2020-12-22 03:47:46,630 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 03:47:46" (1/1) ... [2020-12-22 03:47:46,640 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 03:47:46" (1/1) ... [2020-12-22 03:47:46,648 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-12-22 03:47:46,652 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-12-22 03:47:46,652 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-12-22 03:47:46,653 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-12-22 03:47:46,654 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 03:47:46" (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 [2020-12-22 03:47:46,825 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-12-22 03:47:46,825 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-12-22 03:47:46,825 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2020-12-22 03:47:46,825 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2020-12-22 03:47:46,826 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-12-22 03:47:46,826 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2020-12-22 03:47:46,826 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-12-22 03:47:46,826 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-12-22 03:47:46,826 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-12-22 03:47:46,826 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-12-22 03:47:47,358 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-12-22 03:47:47,359 INFO L299 CfgBuilder]: Removed 11 assume(true) statements. [2020-12-22 03:47:47,360 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.12 03:47:47 BoogieIcfgContainer [2020-12-22 03:47:47,361 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-12-22 03:47:47,362 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-12-22 03:47:47,363 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-12-22 03:47:47,366 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-12-22 03:47:47,366 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.12 03:47:45" (1/3) ... [2020-12-22 03:47:47,367 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@11ce0802 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.12 03:47:47, skipping insertion in model container [2020-12-22 03:47:47,367 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 03:47:46" (2/3) ... [2020-12-22 03:47:47,368 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@11ce0802 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.12 03:47:47, skipping insertion in model container [2020-12-22 03:47:47,368 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.12 03:47:47" (3/3) ... [2020-12-22 03:47:47,369 INFO L111 eAbstractionObserver]: Analyzing ICFG alternating_list-2.i [2020-12-22 03:47:47,376 INFO L153 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-12-22 03:47:47,381 INFO L165 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-12-22 03:47:47,400 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-12-22 03:47:47,429 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-12-22 03:47:47,429 INFO L378 AbstractCegarLoop]: Hoare is true [2020-12-22 03:47:47,429 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-12-22 03:47:47,429 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-12-22 03:47:47,429 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-12-22 03:47:47,430 INFO L382 AbstractCegarLoop]: Difference is false [2020-12-22 03:47:47,430 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-12-22 03:47:47,430 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-12-22 03:47:47,446 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states. [2020-12-22 03:47:47,452 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2020-12-22 03:47:47,453 INFO L414 BasicCegarLoop]: Found error trace [2020-12-22 03:47:47,453 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-22 03:47:47,454 INFO L429 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-22 03:47:47,460 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-22 03:47:47,461 INFO L82 PathProgramCache]: Analyzing trace with hash -1953862777, now seen corresponding path program 1 times [2020-12-22 03:47:47,472 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-22 03:47:47,472 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1057027868] [2020-12-22 03:47:47,473 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-22 03:47:47,595 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 03:47:47,652 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-22 03:47:47,653 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1057027868] [2020-12-22 03:47:47,654 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-22 03:47:47,654 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-12-22 03:47:47,655 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1519831003] [2020-12-22 03:47:47,661 INFO L461 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-12-22 03:47:47,661 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-22 03:47:47,677 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-12-22 03:47:47,678 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-12-22 03:47:47,681 INFO L87 Difference]: Start difference. First operand 28 states. Second operand 2 states. [2020-12-22 03:47:47,702 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-22 03:47:47,702 INFO L93 Difference]: Finished difference Result 44 states and 61 transitions. [2020-12-22 03:47:47,702 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-12-22 03:47:47,704 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 11 [2020-12-22 03:47:47,704 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-22 03:47:47,715 INFO L225 Difference]: With dead ends: 44 [2020-12-22 03:47:47,715 INFO L226 Difference]: Without dead ends: 19 [2020-12-22 03:47:47,719 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 [2020-12-22 03:47:47,740 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2020-12-22 03:47:47,756 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2020-12-22 03:47:47,757 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2020-12-22 03:47:47,758 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 23 transitions. [2020-12-22 03:47:47,760 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 23 transitions. Word has length 11 [2020-12-22 03:47:47,761 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-22 03:47:47,761 INFO L481 AbstractCegarLoop]: Abstraction has 19 states and 23 transitions. [2020-12-22 03:47:47,761 INFO L482 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-12-22 03:47:47,761 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 23 transitions. [2020-12-22 03:47:47,762 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-12-22 03:47:47,762 INFO L414 BasicCegarLoop]: Found error trace [2020-12-22 03:47:47,762 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-22 03:47:47,763 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-12-22 03:47:47,763 INFO L429 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-22 03:47:47,764 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-22 03:47:47,764 INFO L82 PathProgramCache]: Analyzing trace with hash -1732890257, now seen corresponding path program 1 times [2020-12-22 03:47:47,764 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-22 03:47:47,764 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [593948125] [2020-12-22 03:47:47,765 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-22 03:47:47,794 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 03:47:47,869 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-22 03:47:47,870 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [593948125] [2020-12-22 03:47:47,870 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-22 03:47:47,870 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-12-22 03:47:47,871 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1140139115] [2020-12-22 03:47:47,872 INFO L461 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-12-22 03:47:47,872 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-22 03:47:47,873 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-12-22 03:47:47,874 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-12-22 03:47:47,874 INFO L87 Difference]: Start difference. First operand 19 states and 23 transitions. Second operand 5 states. [2020-12-22 03:47:47,988 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-22 03:47:47,988 INFO L93 Difference]: Finished difference Result 44 states and 54 transitions. [2020-12-22 03:47:47,989 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-12-22 03:47:47,989 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 12 [2020-12-22 03:47:47,989 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-22 03:47:47,990 INFO L225 Difference]: With dead ends: 44 [2020-12-22 03:47:47,991 INFO L226 Difference]: Without dead ends: 33 [2020-12-22 03:47:47,992 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 [2020-12-22 03:47:47,993 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-12-22 03:47:47,997 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 21. [2020-12-22 03:47:47,997 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-12-22 03:47:47,998 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2020-12-22 03:47:47,999 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 12 [2020-12-22 03:47:47,999 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-22 03:47:47,999 INFO L481 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2020-12-22 03:47:47,999 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-12-22 03:47:47,999 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2020-12-22 03:47:48,000 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-12-22 03:47:48,000 INFO L414 BasicCegarLoop]: Found error trace [2020-12-22 03:47:48,001 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-22 03:47:48,001 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-12-22 03:47:48,001 INFO L429 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-22 03:47:48,002 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-22 03:47:48,002 INFO L82 PathProgramCache]: Analyzing trace with hash 397665306, now seen corresponding path program 1 times [2020-12-22 03:47:48,003 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-22 03:47:48,003 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1035610395] [2020-12-22 03:47:48,003 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-22 03:47:48,067 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-12-22 03:47:48,068 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-12-22 03:47:48,099 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-12-22 03:47:48,100 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-12-22 03:47:48,130 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-12-22 03:47:48,131 INFO L523 BasicCegarLoop]: Counterexample might be feasible [2020-12-22 03:47:48,131 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-12-22 03:47:48,180 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 22.12 03:47:48 BoogieIcfgContainer [2020-12-22 03:47:48,180 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-12-22 03:47:48,181 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2020-12-22 03:47:48,181 INFO L271 PluginConnector]: Initializing Witness Printer... [2020-12-22 03:47:48,182 INFO L275 PluginConnector]: Witness Printer initialized [2020-12-22 03:47:48,183 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.12 03:47:47" (3/4) ... [2020-12-22 03:47:48,186 INFO L131 WitnessPrinter]: Generating witness for reachability counterexample [2020-12-22 03:47:48,281 INFO L141 WitnessManager]: Wrote witness to /storage/repos/svcomp/c/list-properties/alternating_list-2.i-witness.graphml [2020-12-22 03:47:48,282 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2020-12-22 03:47:48,285 INFO L168 Benchmark]: Toolchain (without parser) took 2512.17 ms. Allocated memory is still 155.2 MB. Free memory was 128.8 MB in the beginning and 77.3 MB in the end (delta: 51.5 MB). Peak memory consumption was 51.9 MB. Max. memory is 8.0 GB. [2020-12-22 03:47:48,286 INFO L168 Benchmark]: CDTParser took 0.21 ms. Allocated memory is still 155.2 MB. Free memory is still 127.3 MB. There was no memory consumed. Max. memory is 8.0 GB. [2020-12-22 03:47:48,288 INFO L168 Benchmark]: CACSL2BoogieTranslator took 698.87 ms. Allocated memory is still 155.2 MB. Free memory was 128.6 MB in the beginning and 106.4 MB in the end (delta: 22.2 MB). Peak memory consumption was 23.1 MB. Max. memory is 8.0 GB. [2020-12-22 03:47:48,293 INFO L168 Benchmark]: Boogie Procedure Inliner took 99.25 ms. Allocated memory is still 155.2 MB. Free memory was 106.4 MB in the beginning and 104.5 MB in the end (delta: 1.9 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. [2020-12-22 03:47:48,295 INFO L168 Benchmark]: Boogie Preprocessor took 74.52 ms. Allocated memory is still 155.2 MB. Free memory was 104.5 MB in the beginning and 103.0 MB in the end (delta: 1.5 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. [2020-12-22 03:47:48,297 INFO L168 Benchmark]: RCFGBuilder took 708.60 ms. Allocated memory is still 155.2 MB. Free memory was 103.0 MB in the beginning and 120.2 MB in the end (delta: -17.2 MB). Peak memory consumption was 5.7 MB. Max. memory is 8.0 GB. [2020-12-22 03:47:48,298 INFO L168 Benchmark]: TraceAbstraction took 818.15 ms. Allocated memory is still 155.2 MB. Free memory was 119.7 MB in the beginning and 79.9 MB in the end (delta: 39.8 MB). Peak memory consumption was 39.8 MB. Max. memory is 8.0 GB. [2020-12-22 03:47:48,299 INFO L168 Benchmark]: Witness Printer took 100.54 ms. Allocated memory is still 155.2 MB. Free memory was 79.9 MB in the beginning and 77.3 MB in the end (delta: 2.6 MB). Peak memory consumption was 3.1 MB. Max. memory is 8.0 GB. [2020-12-22 03:47:48,309 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.21 ms. Allocated memory is still 155.2 MB. Free memory is still 127.3 MB. There was no memory consumed. Max. memory is 8.0 GB. * CACSL2BoogieTranslator took 698.87 ms. Allocated memory is still 155.2 MB. Free memory was 128.6 MB in the beginning and 106.4 MB in the end (delta: 22.2 MB). Peak memory consumption was 23.1 MB. Max. memory is 8.0 GB. * Boogie Procedure Inliner took 99.25 ms. Allocated memory is still 155.2 MB. Free memory was 106.4 MB in the beginning and 104.5 MB in the end (delta: 1.9 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. * Boogie Preprocessor took 74.52 ms. Allocated memory is still 155.2 MB. Free memory was 104.5 MB in the beginning and 103.0 MB in the end (delta: 1.5 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. * RCFGBuilder took 708.60 ms. Allocated memory is still 155.2 MB. Free memory was 103.0 MB in the beginning and 120.2 MB in the end (delta: -17.2 MB). Peak memory consumption was 5.7 MB. Max. memory is 8.0 GB. * TraceAbstraction took 818.15 ms. Allocated memory is still 155.2 MB. Free memory was 119.7 MB in the beginning and 79.9 MB in the end (delta: 39.8 MB). Peak memory consumption was 39.8 MB. Max. memory is 8.0 GB. * Witness Printer took 100.54 ms. Allocated memory is still 155.2 MB. Free memory was 79.9 MB in the beginning and 77.3 MB in the end (delta: 2.6 MB). Peak memory consumption was 3.1 MB. Max. memory is 8.0 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 573]: a call to reach_error is reachable a call to reach_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 [L573] reach_error() - StatisticsResult: Ultimate Automizer benchmark data CFG has 1 procedures, 28 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 0.7s, OverallIterations: 3, TraceHistogramMax: 2, AutomataDifference: 0.1s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 50 SDtfs, 16 SDslu, 37 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=28occurred 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, 12 StatesRemovedByMinimization, 1 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.1s SatisfiabilityAnalysisTime, 0.1s InterpolantComputationTime, 41 NumberOfCodeBlocks, 41 NumberOfCodeBlocksAsserted, 3 NumberOfCheckSat, 21 ConstructedInterpolants, 0 QuantifiedInterpolants, 507 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...