/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/recursive-simple/sum_2x3-1.c -------------------------------------------------------------------------------- This is Ultimate 0.2.0-b8ad66e [2020-10-23 18:20:56,830 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-10-23 18:20:56,832 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-10-23 18:20:56,869 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-10-23 18:20:56,869 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-10-23 18:20:56,871 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-10-23 18:20:56,872 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-10-23 18:20:56,875 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-10-23 18:20:56,877 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-10-23 18:20:56,878 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-10-23 18:20:56,879 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-10-23 18:20:56,880 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-10-23 18:20:56,881 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-10-23 18:20:56,882 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-10-23 18:20:56,883 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-10-23 18:20:56,884 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-10-23 18:20:56,885 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-10-23 18:20:56,886 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-10-23 18:20:56,888 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-10-23 18:20:56,891 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-10-23 18:20:56,893 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-10-23 18:20:56,894 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-10-23 18:20:56,895 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-10-23 18:20:56,896 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-10-23 18:20:56,900 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-10-23 18:20:56,914 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-10-23 18:20:56,915 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-10-23 18:20:56,916 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-10-23 18:20:56,917 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 [2020-10-23 18:20:56,968 INFO L113 SettingsManager]: Loading preferences was successful [2020-10-23 18:20:56,968 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-10-23 18:20:56,970 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-10-23 18:20:56,971 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-10-23 18:20:56,971 INFO L138 SettingsManager]: * Use SBE=true [2020-10-23 18:20:56,971 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-10-23 18:20:56,971 INFO L138 SettingsManager]: * sizeof long=4 [2020-10-23 18:20:56,972 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-10-23 18:20:56,972 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-10-23 18:20:56,972 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-10-23 18:20:56,972 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-10-23 18:20:56,972 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-10-23 18:20:56,973 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-10-23 18:20:56,973 INFO L138 SettingsManager]: * sizeof long double=12 [2020-10-23 18:20:56,974 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-10-23 18:20:56,974 INFO L138 SettingsManager]: * Use constant arrays=true [2020-10-23 18:20:56,974 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-10-23 18:20:56,974 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-10-23 18:20:56,975 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-10-23 18:20:56,975 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-10-23 18:20:56,975 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-10-23 18:20:56,975 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-10-23 18:20:56,975 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-10-23 18:20:56,976 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-10-23 18:20:56,976 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-10-23 18:20:56,976 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-10-23 18:20:56,976 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-10-23 18:20:56,976 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-10-23 18:20:56,976 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-10-23 18:20:56,977 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2020-10-23 18:20:57,351 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-10-23 18:20:57,386 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-10-23 18:20:57,389 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-10-23 18:20:57,390 INFO L271 PluginConnector]: Initializing CDTParser... [2020-10-23 18:20:57,391 INFO L275 PluginConnector]: CDTParser initialized [2020-10-23 18:20:57,392 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/sum_2x3-1.c [2020-10-23 18:20:57,478 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/54a8f1964/9812f70a2f344c488f30267cc94df971/FLAG1205c8474 [2020-10-23 18:20:58,012 INFO L306 CDTParser]: Found 1 translation units. [2020-10-23 18:20:58,012 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/sum_2x3-1.c [2020-10-23 18:20:58,019 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/54a8f1964/9812f70a2f344c488f30267cc94df971/FLAG1205c8474 [2020-10-23 18:20:58,390 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/54a8f1964/9812f70a2f344c488f30267cc94df971 [2020-10-23 18:20:58,394 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-10-23 18:20:58,402 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-10-23 18:20:58,406 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-10-23 18:20:58,407 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-10-23 18:20:58,411 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-10-23 18:20:58,413 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.10 06:20:58" (1/1) ... [2020-10-23 18:20:58,417 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5d1af595 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 06:20:58, skipping insertion in model container [2020-10-23 18:20:58,417 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.10 06:20:58" (1/1) ... [2020-10-23 18:20:58,427 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-10-23 18:20:58,443 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-10-23 18:20:58,647 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-10-23 18:20:58,657 INFO L203 MainTranslator]: Completed pre-run [2020-10-23 18:20:58,675 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-10-23 18:20:58,691 INFO L208 MainTranslator]: Completed translation [2020-10-23 18:20:58,692 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 06:20:58 WrapperNode [2020-10-23 18:20:58,692 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-10-23 18:20:58,693 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-10-23 18:20:58,693 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-10-23 18:20:58,694 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-10-23 18:20:58,707 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 06:20:58" (1/1) ... [2020-10-23 18:20:58,707 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 06:20:58" (1/1) ... [2020-10-23 18:20:58,714 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 06:20:58" (1/1) ... [2020-10-23 18:20:58,715 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 06:20:58" (1/1) ... [2020-10-23 18:20:58,720 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 06:20:58" (1/1) ... [2020-10-23 18:20:58,722 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 06:20:58" (1/1) ... [2020-10-23 18:20:58,723 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 06:20:58" (1/1) ... [2020-10-23 18:20:58,725 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-10-23 18:20:58,726 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-10-23 18:20:58,726 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-10-23 18:20:58,727 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-10-23 18:20:58,728 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 06:20:58" (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 [2020-10-23 18:20:58,812 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-10-23 18:20:58,812 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-10-23 18:20:58,813 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2020-10-23 18:20:58,814 INFO L138 BoogieDeclarations]: Found implementation of procedure sum [2020-10-23 18:20:58,814 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-10-23 18:20:58,814 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-10-23 18:20:58,814 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2020-10-23 18:20:58,814 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2020-10-23 18:20:58,815 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-10-23 18:20:58,815 INFO L130 BoogieDeclarations]: Found specification of procedure sum [2020-10-23 18:20:58,815 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-10-23 18:20:58,816 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-10-23 18:20:58,816 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-10-23 18:20:58,817 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-10-23 18:20:58,817 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-10-23 18:20:58,818 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-10-23 18:20:58,818 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-10-23 18:20:59,274 INFO L293 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-10-23 18:20:59,274 INFO L298 CfgBuilder]: Removed 0 assume(true) statements. [2020-10-23 18:20:59,276 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.10 06:20:59 BoogieIcfgContainer [2020-10-23 18:20:59,276 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-10-23 18:20:59,280 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-10-23 18:20:59,280 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-10-23 18:20:59,284 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-10-23 18:20:59,284 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.10 06:20:58" (1/3) ... [2020-10-23 18:20:59,285 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1b1c7b8d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.10 06:20:59, skipping insertion in model container [2020-10-23 18:20:59,285 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 06:20:58" (2/3) ... [2020-10-23 18:20:59,286 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1b1c7b8d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.10 06:20:59, skipping insertion in model container [2020-10-23 18:20:59,286 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.10 06:20:59" (3/3) ... [2020-10-23 18:20:59,288 INFO L111 eAbstractionObserver]: Analyzing ICFG sum_2x3-1.c [2020-10-23 18:20:59,301 INFO L164 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-10-23 18:20:59,306 INFO L176 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-10-23 18:20:59,337 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-10-23 18:20:59,376 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-10-23 18:20:59,376 INFO L378 AbstractCegarLoop]: Hoare is true [2020-10-23 18:20:59,376 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-10-23 18:20:59,376 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-10-23 18:20:59,376 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-10-23 18:20:59,377 INFO L382 AbstractCegarLoop]: Difference is false [2020-10-23 18:20:59,377 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-10-23 18:20:59,377 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-10-23 18:20:59,398 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states. [2020-10-23 18:20:59,408 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-10-23 18:20:59,408 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 18:20:59,409 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-23 18:20:59,409 INFO L429 AbstractCegarLoop]: === Iteration 1 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 18:20:59,418 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 18:20:59,419 INFO L82 PathProgramCache]: Analyzing trace with hash -2012080153, now seen corresponding path program 1 times [2020-10-23 18:20:59,429 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-23 18:20:59,430 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [109630553] [2020-10-23 18:20:59,430 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 18:20:59,568 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:20:59,705 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 18:20:59,711 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:20:59,724 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-10-23 18:20:59,730 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:20:59,789 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-23 18:20:59,790 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [109630553] [2020-10-23 18:20:59,791 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-23 18:20:59,791 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-10-23 18:20:59,793 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1686512536] [2020-10-23 18:20:59,799 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-10-23 18:20:59,799 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-10-23 18:20:59,814 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-10-23 18:20:59,815 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-10-23 18:20:59,817 INFO L87 Difference]: Start difference. First operand 25 states. Second operand 6 states. [2020-10-23 18:21:00,159 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 18:21:00,160 INFO L93 Difference]: Finished difference Result 36 states and 40 transitions. [2020-10-23 18:21:00,161 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-10-23 18:21:00,162 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 15 [2020-10-23 18:21:00,163 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 18:21:00,172 INFO L225 Difference]: With dead ends: 36 [2020-10-23 18:21:00,172 INFO L226 Difference]: Without dead ends: 20 [2020-10-23 18:21:00,175 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2020-10-23 18:21:00,193 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-10-23 18:21:00,217 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2020-10-23 18:21:00,218 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-10-23 18:21:00,229 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 21 transitions. [2020-10-23 18:21:00,230 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 21 transitions. Word has length 15 [2020-10-23 18:21:00,231 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 18:21:00,231 INFO L481 AbstractCegarLoop]: Abstraction has 20 states and 21 transitions. [2020-10-23 18:21:00,231 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-10-23 18:21:00,231 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 21 transitions. [2020-10-23 18:21:00,233 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-10-23 18:21:00,233 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 18:21:00,233 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-23 18:21:00,233 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-10-23 18:21:00,234 INFO L429 AbstractCegarLoop]: === Iteration 2 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 18:21:00,235 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 18:21:00,235 INFO L82 PathProgramCache]: Analyzing trace with hash -292229313, now seen corresponding path program 1 times [2020-10-23 18:21:00,235 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-23 18:21:00,235 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [842835790] [2020-10-23 18:21:00,235 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 18:21:00,262 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:21:00,341 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 18:21:00,350 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:21:00,370 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-10-23 18:21:00,384 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:21:00,465 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-10-23 18:21:00,469 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:21:00,512 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-10-23 18:21:00,515 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [842835790] [2020-10-23 18:21:00,516 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1631639679] [2020-10-23 18:21:00,516 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-10-23 18:21:00,614 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:21:00,616 INFO L263 TraceCheckSpWp]: Trace formula consists of 121 conjuncts, 6 conjunts are in the unsatisfiable core [2020-10-23 18:21:00,622 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-10-23 18:21:00,735 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-10-23 18:21:00,736 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-10-23 18:21:00,736 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 9 [2020-10-23 18:21:00,737 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1593214756] [2020-10-23 18:21:00,738 INFO L461 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-10-23 18:21:00,738 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-10-23 18:21:00,739 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-10-23 18:21:00,739 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=54, Unknown=0, NotChecked=0, Total=72 [2020-10-23 18:21:00,739 INFO L87 Difference]: Start difference. First operand 20 states and 21 transitions. Second operand 9 states. [2020-10-23 18:21:01,040 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 18:21:01,041 INFO L93 Difference]: Finished difference Result 28 states and 29 transitions. [2020-10-23 18:21:01,041 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-10-23 18:21:01,041 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 21 [2020-10-23 18:21:01,042 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 18:21:01,043 INFO L225 Difference]: With dead ends: 28 [2020-10-23 18:21:01,043 INFO L226 Difference]: Without dead ends: 23 [2020-10-23 18:21:01,044 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2020-10-23 18:21:01,045 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-10-23 18:21:01,051 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2020-10-23 18:21:01,051 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-10-23 18:21:01,052 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 24 transitions. [2020-10-23 18:21:01,052 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 24 transitions. Word has length 21 [2020-10-23 18:21:01,053 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 18:21:01,053 INFO L481 AbstractCegarLoop]: Abstraction has 23 states and 24 transitions. [2020-10-23 18:21:01,053 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-10-23 18:21:01,053 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 24 transitions. [2020-10-23 18:21:01,054 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-10-23 18:21:01,054 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 18:21:01,054 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-23 18:21:01,269 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2020-10-23 18:21:01,270 INFO L429 AbstractCegarLoop]: === Iteration 3 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 18:21:01,272 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 18:21:01,272 INFO L82 PathProgramCache]: Analyzing trace with hash 1887732007, now seen corresponding path program 2 times [2020-10-23 18:21:01,273 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-23 18:21:01,273 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [202934402] [2020-10-23 18:21:01,273 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 18:21:01,315 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-23 18:21:01,316 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-23 18:21:01,364 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-23 18:21:01,365 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-23 18:21:01,401 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-10-23 18:21:01,402 INFO L523 BasicCegarLoop]: Counterexample might be feasible [2020-10-23 18:21:01,402 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-10-23 18:21:01,436 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 23.10 06:21:01 BoogieIcfgContainer [2020-10-23 18:21:01,437 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-10-23 18:21:01,439 INFO L168 Benchmark]: Toolchain (without parser) took 3041.02 ms. Allocated memory is still 167.8 MB. Free memory was 144.4 MB in the beginning and 144.4 MB in the end (delta: -10.4 kB). Peak memory consumption was 971.9 kB. Max. memory is 8.0 GB. [2020-10-23 18:21:01,440 INFO L168 Benchmark]: CDTParser took 0.16 ms. Allocated memory is still 125.8 MB. Free memory was 101.3 MB in the beginning and 101.3 MB in the end (delta: 71.8 kB). There was no memory consumed. Max. memory is 8.0 GB. [2020-10-23 18:21:01,441 INFO L168 Benchmark]: CACSL2BoogieTranslator took 286.14 ms. Allocated memory is still 167.8 MB. Free memory was 143.8 MB in the beginning and 134.7 MB in the end (delta: 9.2 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. [2020-10-23 18:21:01,442 INFO L168 Benchmark]: Boogie Preprocessor took 32.05 ms. Allocated memory is still 167.8 MB. Free memory was 134.7 MB in the beginning and 133.5 MB in the end (delta: 1.2 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. [2020-10-23 18:21:01,443 INFO L168 Benchmark]: RCFGBuilder took 550.07 ms. Allocated memory is still 167.8 MB. Free memory was 133.3 MB in the beginning and 121.0 MB in the end (delta: 12.4 MB). Peak memory consumption was 12.6 MB. Max. memory is 8.0 GB. [2020-10-23 18:21:01,444 INFO L168 Benchmark]: TraceAbstraction took 2156.73 ms. Allocated memory is still 167.8 MB. Free memory was 120.6 MB in the beginning and 144.4 MB in the end (delta: -23.8 MB). There was no memory consumed. Max. memory is 8.0 GB. [2020-10-23 18:21:01,448 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.16 ms. Allocated memory is still 125.8 MB. Free memory was 101.3 MB in the beginning and 101.3 MB in the end (delta: 71.8 kB). There was no memory consumed. Max. memory is 8.0 GB. * CACSL2BoogieTranslator took 286.14 ms. Allocated memory is still 167.8 MB. Free memory was 143.8 MB in the beginning and 134.7 MB in the end (delta: 9.2 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. * Boogie Preprocessor took 32.05 ms. Allocated memory is still 167.8 MB. Free memory was 134.7 MB in the beginning and 133.5 MB in the end (delta: 1.2 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. * RCFGBuilder took 550.07 ms. Allocated memory is still 167.8 MB. Free memory was 133.3 MB in the beginning and 121.0 MB in the end (delta: 12.4 MB). Peak memory consumption was 12.6 MB. Max. memory is 8.0 GB. * TraceAbstraction took 2156.73 ms. Allocated memory is still 167.8 MB. Free memory was 120.6 MB in the beginning and 144.4 MB in the end (delta: -23.8 MB). There was no memory consumed. Max. memory is 8.0 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 3]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L14] int a = 2; [L15] int b = 3; VAL [a=2, b=3] [L16] CALL, EXPR sum(a, b) VAL [\old(m)=3, \old(n)=2] [L6] COND FALSE !(n <= 0) VAL [\old(m)=3, \old(n)=2, m=3, n=2] [L9] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=4, \old(n)=1] [L6] COND FALSE !(n <= 0) VAL [\old(m)=4, \old(n)=1, m=4, n=1] [L9] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=5, \old(n)=0] [L6] COND TRUE n <= 0 [L7] return m + n; VAL [\old(m)=5, \old(n)=0, \result=5, m=5, n=0] [L9] RET, EXPR sum(n - 1, m + 1) VAL [\old(m)=4, \old(n)=1, m=4, n=1, sum(n - 1, m + 1)=5] [L9] return sum(n - 1, m + 1); [L9] RET, EXPR sum(n - 1, m + 1) VAL [\old(m)=3, \old(n)=2, m=3, n=2, sum(n - 1, m + 1)=5] [L9] return sum(n - 1, m + 1); [L16] RET, EXPR sum(a, b) VAL [a=2, b=3, sum(a, b)=5] [L16] int result = sum(a, b); [L17] COND TRUE result == a + b VAL [a=2, b=3, result=5] [L18] CALL reach_error() [L3] __assert_fail("0", "sum_2x3-1.c", 3, "reach_error") - StatisticsResult: Ultimate Automizer benchmark data CFG has 5 procedures, 25 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 2.0s, OverallIterations: 3, TraceHistogramMax: 3, AutomataDifference: 0.6s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 29 SDtfs, 41 SDslu, 54 SDs, 0 SdLazy, 100 SolverSat, 23 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.1s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 46 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.6s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=25occurred 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, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.1s SatisfiabilityAnalysisTime, 0.5s InterpolantComputationTime, 84 NumberOfCodeBlocks, 84 NumberOfCodeBlocksAsserted, 4 NumberOfCheckSat, 54 ConstructedInterpolants, 0 QuantifiedInterpolants, 2848 SizeOfPredicates, 3 NumberOfNonLiveVariables, 121 ConjunctsInSsa, 6 ConjunctsInUnsatCore, 3 InterpolantComputations, 1 PerfectInterpolantSequences, 4/8 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...