/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data --core.log.level.for.class de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loops/nec20.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-c225d54 [2021-05-02 11:50:20,379 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-02 11:50:20,380 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-02 11:50:20,410 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-02 11:50:20,428 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-05-02 11:50:20,428 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-05-02 11:50:20,429 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-05-02 11:50:20,429 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-05-02 11:50:20,430 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-05-02 11:50:20,430 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-05-02 11:50:20,431 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-05-02 11:50:20,432 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-05-02 11:50:20,433 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-05-02 11:50:20,437 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-05-02 11:50:20,438 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-05-02 11:50:20,438 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-05-02 11:50:20,440 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-05-02 11:50:20,444 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-02 11:50:20,445 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-02 11:50:20,445 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-02 11:50:20,446 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2021-05-02 11:50:20,469 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-02 11:50:20,469 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-02 11:50:20,471 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-05-02 11:50:20,472 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-05-02 11:50:20,472 INFO L138 SettingsManager]: * Use SBE=true [2021-05-02 11:50:20,472 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-02 11:50:20,472 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-02 11:50:20,472 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-02 11:50:20,472 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-02 11:50:20,473 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-02 11:50:20,473 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-02 11:50:20,473 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-02 11:50:20,473 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-02 11:50:20,473 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-02 11:50:20,474 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-02 11:50:20,474 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-02 11:50:20,474 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-02 11:50:20,474 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-02 11:50:20,474 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-02 11:50:20,474 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-02 11:50:20,474 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 11:50:20,474 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-02 11:50:20,474 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-05-02 11:50:20,474 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-05-02 11:50:20,475 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-02 11:50:20,475 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-05-02 11:50:20,475 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-05-02 11:50:20,475 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-05-02 11:50:20,475 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-02 11:50:20,740 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-02 11:50:20,758 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-02 11:50:20,760 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-02 11:50:20,761 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-02 11:50:20,761 INFO L275 PluginConnector]: CDTParser initialized [2021-05-02 11:50:20,762 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops/nec20.c [2021-05-02 11:50:20,804 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/704141f93/59d06a3bd8c5444fb07a40d0f24bde01/FLAG3292a92d0 [2021-05-02 11:50:21,115 INFO L306 CDTParser]: Found 1 translation units. [2021-05-02 11:50:21,115 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops/nec20.c [2021-05-02 11:50:21,119 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/704141f93/59d06a3bd8c5444fb07a40d0f24bde01/FLAG3292a92d0 [2021-05-02 11:50:21,561 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/704141f93/59d06a3bd8c5444fb07a40d0f24bde01 [2021-05-02 11:50:21,562 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-02 11:50:21,563 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-05-02 11:50:21,564 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-02 11:50:21,564 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-02 11:50:21,568 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-02 11:50:21,569 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 11:50:21" (1/1) ... [2021-05-02 11:50:21,570 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@315e3776 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:50:21, skipping insertion in model container [2021-05-02 11:50:21,570 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 11:50:21" (1/1) ... [2021-05-02 11:50:21,575 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-02 11:50:21,584 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-02 11:50:21,669 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loops/nec20.c[356,369] [2021-05-02 11:50:21,688 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 11:50:21,694 INFO L203 MainTranslator]: Completed pre-run [2021-05-02 11:50:21,702 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loops/nec20.c[356,369] [2021-05-02 11:50:21,716 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 11:50:21,758 INFO L208 MainTranslator]: Completed translation [2021-05-02 11:50:21,759 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:50:21 WrapperNode [2021-05-02 11:50:21,759 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-02 11:50:21,760 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-02 11:50:21,760 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-02 11:50:21,762 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-02 11:50:21,771 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:50:21" (1/1) ... [2021-05-02 11:50:21,771 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:50:21" (1/1) ... [2021-05-02 11:50:21,776 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:50:21" (1/1) ... [2021-05-02 11:50:21,776 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:50:21" (1/1) ... [2021-05-02 11:50:21,789 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:50:21" (1/1) ... [2021-05-02 11:50:21,793 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:50:21" (1/1) ... [2021-05-02 11:50:21,795 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:50:21" (1/1) ... [2021-05-02 11:50:21,799 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-02 11:50:21,800 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-02 11:50:21,800 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-02 11:50:21,800 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-02 11:50:21,800 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:50:21" (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 [2021-05-02 11:50:21,878 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-02 11:50:21,878 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-02 11:50:21,878 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-02 11:50:21,878 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-02 11:50:21,878 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-02 11:50:21,878 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-02 11:50:21,879 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-02 11:50:21,879 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-02 11:50:21,879 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-02 11:50:21,879 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2021-05-02 11:50:21,879 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-02 11:50:21,879 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_bool [2021-05-02 11:50:21,880 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-02 11:50:21,880 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-02 11:50:21,881 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-02 11:50:21,881 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-02 11:50:21,881 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-02 11:50:21,881 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-02 11:50:21,881 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-02 11:50:22,142 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-02 11:50:22,142 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2021-05-02 11:50:22,143 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 11:50:22 BoogieIcfgContainer [2021-05-02 11:50:22,143 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-02 11:50:22,159 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-02 11:50:22,159 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-02 11:50:22,161 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-02 11:50:22,161 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.05 11:50:21" (1/3) ... [2021-05-02 11:50:22,162 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3fd8a91f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 11:50:22, skipping insertion in model container [2021-05-02 11:50:22,162 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:50:21" (2/3) ... [2021-05-02 11:50:22,163 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3fd8a91f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 11:50:22, skipping insertion in model container [2021-05-02 11:50:22,163 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 11:50:22" (3/3) ... [2021-05-02 11:50:22,164 INFO L111 eAbstractionObserver]: Analyzing ICFG nec20.c [2021-05-02 11:50:22,168 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-05-02 11:50:22,170 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-02 11:50:22,181 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-02 11:50:22,205 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-02 11:50:22,205 INFO L377 AbstractCegarLoop]: Hoare is true [2021-05-02 11:50:22,205 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-05-02 11:50:22,205 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-02 11:50:22,205 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-02 11:50:22,205 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-02 11:50:22,205 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-02 11:50:22,205 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-02 11:50:22,219 INFO L276 IsEmpty]: Start isEmpty. Operand has 25 states, 17 states have (on average 1.411764705882353) internal successors, (24), 18 states have internal predecessors, (24), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 11:50:22,222 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-05-02 11:50:22,222 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 11:50:22,223 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 11:50:22,223 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 11:50:22,227 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 11:50:22,227 INFO L82 PathProgramCache]: Analyzing trace with hash 1512797340, now seen corresponding path program 1 times [2021-05-02 11:50:22,232 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 11:50:22,233 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1297300164] [2021-05-02 11:50:22,233 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 11:50:22,316 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:50:22,424 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 11:50:22,427 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:50:22,437 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 11:50:22,438 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 11:50:22,438 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1297300164] [2021-05-02 11:50:22,439 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1297300164] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 11:50:22,439 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 11:50:22,439 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-05-02 11:50:22,440 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1616450147] [2021-05-02 11:50:22,442 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-02 11:50:22,443 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 11:50:22,449 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-02 11:50:22,450 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-05-02 11:50:22,451 INFO L87 Difference]: Start difference. First operand has 25 states, 17 states have (on average 1.411764705882353) internal successors, (24), 18 states have internal predecessors, (24), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 5 states, 5 states have (on average 2.2) internal successors, (11), 4 states have internal predecessors, (11), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:50:22,661 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 11:50:22,661 INFO L93 Difference]: Finished difference Result 53 states and 68 transitions. [2021-05-02 11:50:22,661 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-02 11:50:22,662 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.2) internal successors, (11), 4 states have internal predecessors, (11), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 15 [2021-05-02 11:50:22,662 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 11:50:22,671 INFO L225 Difference]: With dead ends: 53 [2021-05-02 11:50:22,671 INFO L226 Difference]: Without dead ends: 22 [2021-05-02 11:50:22,673 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 132.9ms TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2021-05-02 11:50:22,682 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2021-05-02 11:50:22,692 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 19. [2021-05-02 11:50:22,693 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 14 states have (on average 1.1428571428571428) internal successors, (16), 14 states have internal predecessors, (16), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:50:22,693 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 20 transitions. [2021-05-02 11:50:22,694 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 20 transitions. Word has length 15 [2021-05-02 11:50:22,694 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 11:50:22,695 INFO L480 AbstractCegarLoop]: Abstraction has 19 states and 20 transitions. [2021-05-02 11:50:22,695 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 2.2) internal successors, (11), 4 states have internal predecessors, (11), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:50:22,695 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 20 transitions. [2021-05-02 11:50:22,695 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-05-02 11:50:22,695 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 11:50:22,695 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 11:50:22,695 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-02 11:50:22,696 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 11:50:22,696 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 11:50:22,696 INFO L82 PathProgramCache]: Analyzing trace with hash -2102111586, now seen corresponding path program 1 times [2021-05-02 11:50:22,696 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 11:50:22,696 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [862366623] [2021-05-02 11:50:22,697 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 11:50:22,712 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:50:22,831 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 11:50:22,833 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:50:22,840 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 11:50:22,840 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 11:50:22,840 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [862366623] [2021-05-02 11:50:22,840 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [862366623] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 11:50:22,840 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 11:50:22,840 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-05-02 11:50:22,841 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1298250661] [2021-05-02 11:50:22,841 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-02 11:50:22,841 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 11:50:22,842 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-02 11:50:22,842 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-05-02 11:50:22,842 INFO L87 Difference]: Start difference. First operand 19 states and 20 transitions. Second operand has 5 states, 5 states have (on average 2.2) internal successors, (11), 4 states have internal predecessors, (11), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:50:22,992 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 11:50:22,992 INFO L93 Difference]: Finished difference Result 29 states and 31 transitions. [2021-05-02 11:50:22,993 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-02 11:50:22,993 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.2) internal successors, (11), 4 states have internal predecessors, (11), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 15 [2021-05-02 11:50:22,993 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 11:50:22,994 INFO L225 Difference]: With dead ends: 29 [2021-05-02 11:50:22,994 INFO L226 Difference]: Without dead ends: 23 [2021-05-02 11:50:22,994 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 3 SyntacticMatches, 1 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 158.3ms TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-05-02 11:50:22,995 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2021-05-02 11:50:22,997 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 17. [2021-05-02 11:50:22,997 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 12 states have (on average 1.1666666666666667) internal successors, (14), 12 states have internal predecessors, (14), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:50:22,998 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 18 transitions. [2021-05-02 11:50:22,998 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 18 transitions. Word has length 15 [2021-05-02 11:50:22,998 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 11:50:22,998 INFO L480 AbstractCegarLoop]: Abstraction has 17 states and 18 transitions. [2021-05-02 11:50:22,998 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 2.2) internal successors, (11), 4 states have internal predecessors, (11), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:50:22,998 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 18 transitions. [2021-05-02 11:50:22,999 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-05-02 11:50:22,999 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 11:50:22,999 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 11:50:22,999 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-05-02 11:50:22,999 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 11:50:22,999 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 11:50:22,999 INFO L82 PathProgramCache]: Analyzing trace with hash 1230699476, now seen corresponding path program 1 times [2021-05-02 11:50:23,000 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 11:50:23,000 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1455252842] [2021-05-02 11:50:23,000 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 11:50:23,032 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-05-02 11:50:23,032 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-05-02 11:50:23,067 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-05-02 11:50:23,067 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-05-02 11:50:23,088 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-05-02 11:50:23,088 INFO L624 BasicCegarLoop]: Counterexample might be feasible [2021-05-02 11:50:23,088 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-05-02 11:50:23,110 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 02.05 11:50:23 BoogieIcfgContainer [2021-05-02 11:50:23,110 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-05-02 11:50:23,111 INFO L168 Benchmark]: Toolchain (without parser) took 1547.08 ms. Allocated memory is still 240.1 MB. Free memory was 204.7 MB in the beginning and 155.1 MB in the end (delta: 49.6 MB). Peak memory consumption was 50.9 MB. Max. memory is 8.0 GB. [2021-05-02 11:50:23,111 INFO L168 Benchmark]: CDTParser took 0.08 ms. Allocated memory is still 240.1 MB. Free memory is still 221.2 MB. There was no memory consumed. Max. memory is 8.0 GB. [2021-05-02 11:50:23,111 INFO L168 Benchmark]: CACSL2BoogieTranslator took 194.90 ms. Allocated memory is still 240.1 MB. Free memory was 204.5 MB in the beginning and 222.7 MB in the end (delta: -18.2 MB). Peak memory consumption was 13.0 MB. Max. memory is 8.0 GB. [2021-05-02 11:50:23,112 INFO L168 Benchmark]: Boogie Preprocessor took 39.13 ms. Allocated memory is still 240.1 MB. Free memory was 222.7 MB in the beginning and 221.3 MB in the end (delta: 1.4 MB). There was no memory consumed. Max. memory is 8.0 GB. [2021-05-02 11:50:23,112 INFO L168 Benchmark]: RCFGBuilder took 343.63 ms. Allocated memory is still 240.1 MB. Free memory was 220.9 MB in the beginning and 206.2 MB in the end (delta: 14.7 MB). Peak memory consumption was 14.7 MB. Max. memory is 8.0 GB. [2021-05-02 11:50:23,112 INFO L168 Benchmark]: TraceAbstraction took 951.23 ms. Allocated memory is still 240.1 MB. Free memory was 205.9 MB in the beginning and 155.1 MB in the end (delta: 50.8 MB). Peak memory consumption was 52.5 MB. Max. memory is 8.0 GB. [2021-05-02 11:50:23,114 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.08 ms. Allocated memory is still 240.1 MB. Free memory is still 221.2 MB. There was no memory consumed. Max. memory is 8.0 GB. * CACSL2BoogieTranslator took 194.90 ms. Allocated memory is still 240.1 MB. Free memory was 204.5 MB in the beginning and 222.7 MB in the end (delta: -18.2 MB). Peak memory consumption was 13.0 MB. Max. memory is 8.0 GB. * Boogie Preprocessor took 39.13 ms. Allocated memory is still 240.1 MB. Free memory was 222.7 MB in the beginning and 221.3 MB in the end (delta: 1.4 MB). There was no memory consumed. Max. memory is 8.0 GB. * RCFGBuilder took 343.63 ms. Allocated memory is still 240.1 MB. Free memory was 220.9 MB in the beginning and 206.2 MB in the end (delta: 14.7 MB). Peak memory consumption was 14.7 MB. Max. memory is 8.0 GB. * TraceAbstraction took 951.23 ms. Allocated memory is still 240.1 MB. Free memory was 205.9 MB in the beginning and 155.1 MB in the end (delta: 50.8 MB). Peak memory consumption was 52.5 MB. Max. memory is 8.0 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 8]: a call to reach_error is reachable a call to reach_error is reachable We found a FailurePath: [L12] int b; VAL [\old(b)=261, b=0] [L15] _Bool k=__VERIFIER_nondet_bool(); [L16] unsigned int i,n,j; [L17] int a[1025]; VAL [b=0, k=1] [L19] COND TRUE \read(k) [L20] n=0 VAL [b=0, k=1, n=0] [L25] i=0 [L26] j=__VERIFIER_nondet_uint() [L27] COND FALSE !(j > 10000) VAL [b=0, i=0, j=-4294966273, k=1, n=0] [L30] COND TRUE i <= n [L31] i++ [L32] j= j +2 VAL [b=0, i=1, j=-4294966271, k=1, n=0] [L30] COND FALSE !(i <= n) VAL [b=0, i=1, j=-4294966271, k=1, n=0] [L35] a[i]=0 VAL [b=0, i=1, j=-4294966271, k=1, n=0] [L36] CALL __VERIFIER_assert(j<1025) VAL [\old(cond)=0, b=0] [L7] COND TRUE !(cond) VAL [\old(cond)=0, b=0, cond=0] [L8] reach_error() VAL [\old(cond)=0, b=0, cond=0] - StatisticsResult: Ultimate Automizer benchmark data CFG has 5 procedures, 28 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 885.7ms, OverallIterations: 3, TraceHistogramMax: 1, EmptinessCheckTime: 6.1ms, AutomataDifference: 382.3ms, DeadEndRemovalTime: 0.0ms, HoareAnnotationTime: 0.0ms, InitialAbstractionConstructionTime: 11.4ms, PartialOrderReductionTime: 0.0ms, HoareTripleCheckerStatistics: 45 SDtfs, 53 SDslu, 25 SDs, 0 SdLazy, 73 SolverSat, 9 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 107.2ms Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 18 GetRequests, 7 SyntacticMatches, 1 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 291.3ms Time, 0.0ms BasicInterpolantAutomatonTime, BiggestAbstraction: size=25occurred in iteration=0, InterpolantAutomatonStates: 10, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0ms DumpTime, AutomataMinimizationStatistics: 16.5ms AutomataMinimizationTime, 2 MinimizatonAttempts, 9 StatesRemovedByMinimization, 2 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 8.6ms SsaConstructionTime, 80.4ms SatisfiabilityAnalysisTime, 247.6ms InterpolantComputationTime, 46 NumberOfCodeBlocks, 46 NumberOfCodeBlocksAsserted, 3 NumberOfCheckSat, 28 ConstructedInterpolants, 0 QuantifiedInterpolants, 144 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...