/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/automizer/acceleratedInterpolation/acceleratedInterpolationFastUPR_32.epf -i ../../../trunk/examples/svcomp/recursive-simple/sum_2x3-1.c -------------------------------------------------------------------------------- This is Ultimate 0.2.0-b8ad66e [2020-10-23 20:29:08,225 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-10-23 20:29:08,228 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-10-23 20:29:08,264 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2020-10-23 20:29:08,294 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-10-23 20:29:08,298 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-10-23 20:29:08,300 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-10-23 20:29:08,303 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-10-23 20:29:08,307 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-10-23 20:29:08,312 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-10-23 20:29:08,317 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-10-23 20:29:08,324 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-10-23 20:29:08,328 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-10-23 20:29:08,334 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-10-23 20:29:08,335 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-10-23 20:29:08,336 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-10-23 20:29:08,348 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-10-23 20:29:08,366 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-10-23 20:29:08,368 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-10-23 20:29:08,369 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-10-23 20:29:08,370 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationFastUPR_32.epf [2020-10-23 20:29:08,389 INFO L113 SettingsManager]: Loading preferences was successful [2020-10-23 20:29:08,389 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-10-23 20:29:08,394 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-10-23 20:29:08,395 INFO L138 SettingsManager]: * sizeof long=4 [2020-10-23 20:29:08,395 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-10-23 20:29:08,395 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-10-23 20:29:08,395 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-10-23 20:29:08,395 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-10-23 20:29:08,396 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-10-23 20:29:08,396 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-10-23 20:29:08,397 INFO L138 SettingsManager]: * sizeof long double=12 [2020-10-23 20:29:08,398 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-10-23 20:29:08,398 INFO L138 SettingsManager]: * Use constant arrays=true [2020-10-23 20:29:08,398 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-10-23 20:29:08,398 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-10-23 20:29:08,399 INFO L138 SettingsManager]: * Size of a code block=SingleStatement [2020-10-23 20:29:08,399 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-10-23 20:29:08,399 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-10-23 20:29:08,399 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-10-23 20:29:08,400 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-10-23 20:29:08,400 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=AcceleratedInterpolation [2020-10-23 20:29:08,400 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-10-23 20:29:08,401 INFO L138 SettingsManager]: * Use separate solver for trace checks=false 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2020-10-23 20:29:08,812 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-10-23 20:29:08,860 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-10-23 20:29:08,863 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-10-23 20:29:08,865 INFO L271 PluginConnector]: Initializing CDTParser... [2020-10-23 20:29:08,865 INFO L275 PluginConnector]: CDTParser initialized [2020-10-23 20:29:08,866 INFO L432 ainManager$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 20:29:08,945 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/b047fb6ff/36d622d149ac4aebbc0194bd1be02d2d/FLAGaa7b96517 [2020-10-23 20:29:09,529 INFO L306 CDTParser]: Found 1 translation units. [2020-10-23 20:29:09,529 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/sum_2x3-1.c [2020-10-23 20:29:09,537 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/b047fb6ff/36d622d149ac4aebbc0194bd1be02d2d/FLAGaa7b96517 [2020-10-23 20:29:09,918 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/b047fb6ff/36d622d149ac4aebbc0194bd1be02d2d [2020-10-23 20:29:09,921 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-10-23 20:29:09,931 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-10-23 20:29:09,936 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-10-23 20:29:09,937 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-10-23 20:29:09,941 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-10-23 20:29:09,942 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.10 08:29:09" (1/1) ... [2020-10-23 20:29:09,951 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5bcaf3c7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 08:29:09, skipping insertion in model container [2020-10-23 20:29:09,951 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.10 08:29:09" (1/1) ... [2020-10-23 20:29:09,963 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-10-23 20:29:09,982 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-10-23 20:29:10,188 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-10-23 20:29:10,206 INFO L203 MainTranslator]: Completed pre-run [2020-10-23 20:29:10,229 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-10-23 20:29:10,251 INFO L208 MainTranslator]: Completed translation [2020-10-23 20:29:10,252 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 08:29:10 WrapperNode [2020-10-23 20:29:10,252 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-10-23 20:29:10,254 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-10-23 20:29:10,254 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-10-23 20:29:10,255 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-10-23 20:29:10,270 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 08:29:10" (1/1) ... [2020-10-23 20:29:10,270 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 08:29:10" (1/1) ... [2020-10-23 20:29:10,282 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 08:29:10" (1/1) ... [2020-10-23 20:29:10,283 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 08:29:10" (1/1) ... [2020-10-23 20:29:10,297 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 08:29:10" (1/1) ... [2020-10-23 20:29:10,299 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 08:29:10" (1/1) ... [2020-10-23 20:29:10,306 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 08:29:10" (1/1) ... [2020-10-23 20:29:10,310 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-10-23 20:29:10,312 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-10-23 20:29:10,312 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-10-23 20:29:10,313 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-10-23 20:29:10,317 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 08:29:10" (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 20:29:10,415 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-10-23 20:29:10,416 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-10-23 20:29:10,416 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2020-10-23 20:29:10,417 INFO L138 BoogieDeclarations]: Found implementation of procedure sum [2020-10-23 20:29:10,417 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-10-23 20:29:10,417 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-10-23 20:29:10,417 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2020-10-23 20:29:10,417 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2020-10-23 20:29:10,418 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-10-23 20:29:10,418 INFO L130 BoogieDeclarations]: Found specification of procedure sum [2020-10-23 20:29:10,419 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-10-23 20:29:10,419 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-10-23 20:29:10,419 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-10-23 20:29:10,419 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-10-23 20:29:10,420 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-10-23 20:29:10,420 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-10-23 20:29:10,420 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-10-23 20:29:10,930 INFO L293 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-10-23 20:29:10,930 INFO L298 CfgBuilder]: Removed 0 assume(true) statements. [2020-10-23 20:29:10,932 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.10 08:29:10 BoogieIcfgContainer [2020-10-23 20:29:10,933 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-10-23 20:29:10,935 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-10-23 20:29:10,935 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-10-23 20:29:10,939 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-10-23 20:29:10,940 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.10 08:29:09" (1/3) ... [2020-10-23 20:29:10,941 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@53cdcdbf and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.10 08:29:10, skipping insertion in model container [2020-10-23 20:29:10,941 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 08:29:10" (2/3) ... [2020-10-23 20:29:10,942 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@53cdcdbf and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.10 08:29:10, skipping insertion in model container [2020-10-23 20:29:10,942 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.10 08:29:10" (3/3) ... [2020-10-23 20:29:10,944 INFO L111 eAbstractionObserver]: Analyzing ICFG sum_2x3-1.c [2020-10-23 20:29:10,958 INFO L164 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:AcceleratedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-10-23 20:29:10,963 INFO L176 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-10-23 20:29:10,978 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-10-23 20:29:11,007 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-10-23 20:29:11,007 INFO L378 AbstractCegarLoop]: Hoare is true [2020-10-23 20:29:11,007 INFO L379 AbstractCegarLoop]: Compute interpolants for AcceleratedInterpolation [2020-10-23 20:29:11,007 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-10-23 20:29:11,008 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-10-23 20:29:11,008 INFO L382 AbstractCegarLoop]: Difference is false [2020-10-23 20:29:11,008 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-10-23 20:29:11,008 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-10-23 20:29:11,049 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states. [2020-10-23 20:29:11,061 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-10-23 20:29:11,061 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 20:29:11,063 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-23 20:29:11,063 INFO L429 AbstractCegarLoop]: === Iteration 1 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 20:29:11,080 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 20:29:11,080 INFO L82 PathProgramCache]: Analyzing trace with hash -342472451, now seen corresponding path program 1 times [2020-10-23 20:29:11,107 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-23 20:29:11,109 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [438891653] [2020-10-23 20:29:11,109 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 20:29:11,210 INFO L321 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-10-23 20:29:11,325 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 20:29:11,504 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 20:29:11,510 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 20:29:11,525 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 14 [2020-10-23 20:29:11,530 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 20:29:11,570 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 20:29:11,572 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [438891653] [2020-10-23 20:29:11,575 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-23 20:29:11,575 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-10-23 20:29:11,576 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [135944253] [2020-10-23 20:29:11,581 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-10-23 20:29:11,582 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-23 20:29:11,597 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-10-23 20:29:11,599 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-10-23 20:29:11,601 INFO L87 Difference]: Start difference. First operand 39 states. Second operand 6 states. [2020-10-23 20:29:11,905 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 20:29:11,905 INFO L93 Difference]: Finished difference Result 52 states and 56 transitions. [2020-10-23 20:29:11,906 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-10-23 20:29:11,908 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 27 [2020-10-23 20:29:11,909 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 20:29:11,919 INFO L225 Difference]: With dead ends: 52 [2020-10-23 20:29:11,920 INFO L226 Difference]: Without dead ends: 34 [2020-10-23 20:29:11,924 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2020-10-23 20:29:11,946 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-10-23 20:29:11,981 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2020-10-23 20:29:11,983 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-10-23 20:29:11,985 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 35 transitions. [2020-10-23 20:29:11,987 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 35 transitions. Word has length 27 [2020-10-23 20:29:11,987 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 20:29:11,988 INFO L481 AbstractCegarLoop]: Abstraction has 34 states and 35 transitions. [2020-10-23 20:29:11,988 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-10-23 20:29:11,988 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 35 transitions. [2020-10-23 20:29:11,990 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-10-23 20:29:11,991 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 20:29:11,991 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-23 20:29:11,992 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-10-23 20:29:11,992 INFO L429 AbstractCegarLoop]: === Iteration 2 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 20:29:11,993 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 20:29:11,993 INFO L82 PathProgramCache]: Analyzing trace with hash 653425116, now seen corresponding path program 1 times [2020-10-23 20:29:11,993 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-23 20:29:11,994 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [606257960] [2020-10-23 20:29:11,994 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 20:29:11,998 INFO L321 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-10-23 20:29:12,032 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 20:29:12,181 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 20:29:12,185 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 20:29:12,201 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 14 [2020-10-23 20:29:12,218 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 20:29:12,278 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-10-23 20:29:12,284 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 20:29:12,310 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-10-23 20:29:12,311 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [606257960] [2020-10-23 20:29:12,312 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-23 20:29:12,312 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2020-10-23 20:29:12,312 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2108614573] [2020-10-23 20:29:12,313 INFO L461 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-10-23 20:29:12,313 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-23 20:29:12,314 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-10-23 20:29:12,315 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2020-10-23 20:29:12,315 INFO L87 Difference]: Start difference. First operand 34 states and 35 transitions. Second operand 7 states. [2020-10-23 20:29:12,573 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 20:29:12,574 INFO L93 Difference]: Finished difference Result 46 states and 47 transitions. [2020-10-23 20:29:12,574 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-10-23 20:29:12,575 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 36 [2020-10-23 20:29:12,575 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 20:29:12,577 INFO L225 Difference]: With dead ends: 46 [2020-10-23 20:29:12,577 INFO L226 Difference]: Without dead ends: 39 [2020-10-23 20:29:12,579 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=34, Invalid=76, Unknown=0, NotChecked=0, Total=110 [2020-10-23 20:29:12,579 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-10-23 20:29:12,591 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2020-10-23 20:29:12,592 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-10-23 20:29:12,593 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 40 transitions. [2020-10-23 20:29:12,594 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 40 transitions. Word has length 36 [2020-10-23 20:29:12,594 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 20:29:12,594 INFO L481 AbstractCegarLoop]: Abstraction has 39 states and 40 transitions. [2020-10-23 20:29:12,594 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-10-23 20:29:12,594 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 40 transitions. [2020-10-23 20:29:12,596 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2020-10-23 20:29:12,596 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 20:29:12,596 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-23 20:29:12,597 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-10-23 20:29:12,597 INFO L429 AbstractCegarLoop]: === Iteration 3 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 20:29:12,598 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 20:29:12,598 INFO L82 PathProgramCache]: Analyzing trace with hash 1221623283, now seen corresponding path program 2 times [2020-10-23 20:29:12,598 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-23 20:29:12,598 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [662741752] [2020-10-23 20:29:12,599 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 20:29:12,602 INFO L321 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-10-23 20:29:12,628 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-23 20:29:12,629 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-23 20:29:12,675 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-23 20:29:12,675 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-23 20:29:12,725 INFO L173 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-10-23 20:29:12,726 INFO L523 BasicCegarLoop]: Counterexample might be feasible [2020-10-23 20:29:12,733 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-10-23 20:29:12,753 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 23.10 08:29:12 BoogieIcfgContainer [2020-10-23 20:29:12,754 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-10-23 20:29:12,761 INFO L168 Benchmark]: Toolchain (without parser) took 2830.17 ms. Allocated memory is still 151.0 MB. Free memory was 127.5 MB in the beginning and 84.1 MB in the end (delta: 43.4 MB). Peak memory consumption was 44.5 MB. Max. memory is 8.0 GB. [2020-10-23 20:29:12,769 INFO L168 Benchmark]: CDTParser took 0.21 ms. Allocated memory is still 151.0 MB. Free memory was 124.4 MB in the beginning and 124.4 MB in the end (delta: 73.7 kB). There was no memory consumed. Max. memory is 8.0 GB. [2020-10-23 20:29:12,772 INFO L168 Benchmark]: CACSL2BoogieTranslator took 316.62 ms. Allocated memory is still 151.0 MB. Free memory was 126.9 MB in the beginning and 117.4 MB in the end (delta: 9.6 MB). Peak memory consumption was 10.5 MB. Max. memory is 8.0 GB. [2020-10-23 20:29:12,774 INFO L168 Benchmark]: Boogie Preprocessor took 55.82 ms. Allocated memory is still 151.0 MB. Free memory was 117.4 MB in the beginning and 116.0 MB in the end (delta: 1.3 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. [2020-10-23 20:29:12,776 INFO L168 Benchmark]: RCFGBuilder took 620.96 ms. Allocated memory is still 151.0 MB. Free memory was 116.0 MB in the beginning and 102.8 MB in the end (delta: 13.2 MB). Peak memory consumption was 12.6 MB. Max. memory is 8.0 GB. [2020-10-23 20:29:12,777 INFO L168 Benchmark]: TraceAbstraction took 1819.58 ms. Allocated memory is still 151.0 MB. Free memory was 102.4 MB in the beginning and 84.1 MB in the end (delta: 18.3 MB). Peak memory consumption was 19.3 MB. Max. memory is 8.0 GB. [2020-10-23 20:29:12,783 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 151.0 MB. Free memory was 124.4 MB in the beginning and 124.4 MB in the end (delta: 73.7 kB). There was no memory consumed. Max. memory is 8.0 GB. * CACSL2BoogieTranslator took 316.62 ms. Allocated memory is still 151.0 MB. Free memory was 126.9 MB in the beginning and 117.4 MB in the end (delta: 9.6 MB). Peak memory consumption was 10.5 MB. Max. memory is 8.0 GB. * Boogie Preprocessor took 55.82 ms. Allocated memory is still 151.0 MB. Free memory was 117.4 MB in the beginning and 116.0 MB in the end (delta: 1.3 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. * RCFGBuilder took 620.96 ms. Allocated memory is still 151.0 MB. Free memory was 116.0 MB in the beginning and 102.8 MB in the end (delta: 13.2 MB). Peak memory consumption was 12.6 MB. Max. memory is 8.0 GB. * TraceAbstraction took 1819.58 ms. Allocated memory is still 151.0 MB. Free memory was 102.4 MB in the beginning and 84.1 MB in the end (delta: 18.3 MB). Peak memory consumption was 19.3 MB. 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; [L16] CALL, EXPR sum(a, b) [L6] COND FALSE !(n <= 0) [L9] CALL, EXPR sum(n - 1, m + 1) [L6] COND FALSE !(n <= 0) [L9] CALL, EXPR sum(n - 1, m + 1) [L6] COND TRUE n <= 0 [L7] return m + n; [L9] RET, EXPR sum(n - 1, m + 1) [L9] return sum(n - 1, m + 1); [L9] RET, EXPR sum(n - 1, m + 1) [L9] return sum(n - 1, m + 1); [L16] RET, EXPR sum(a, b) [L16] int result = sum(a, b); [L17] COND TRUE result == a + b [L18] CALL reach_error() [L3] __assert_fail("0", "sum_2x3-1.c", 3, "reach_error") - StatisticsResult: Ultimate Automizer benchmark data CFG has 5 procedures, 39 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 1.7s, OverallIterations: 3, TraceHistogramMax: 3, AutomataDifference: 0.6s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 57 SDtfs, 70 SDslu, 93 SDs, 0 SdLazy, 117 SolverSat, 23 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.2s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 26 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.4s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=39occurred 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: No data available, 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...