/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.use.separate.solver.for.trace.checks true -s ../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationFastUPR_32.epf -i ../../../trunk/examples/svcomp/recursive-simple/sum_2x3-1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-72570d3 [2020-08-22 22:11:48,968 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-22 22:11:48,971 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-22 22:11:48,996 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-22 22:11:48,996 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-22 22:11:48,998 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-22 22:11:48,999 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-22 22:11:49,001 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-22 22:11:49,003 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-22 22:11:49,003 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-22 22:11:49,004 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-22 22:11:49,006 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-22 22:11:49,006 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-22 22:11:49,007 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-22 22:11:49,008 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-22 22:11:49,009 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-22 22:11:49,010 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-22 22:11:49,011 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-22 22:11:49,012 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-22 22:11:49,014 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-22 22:11:49,016 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-22 22:11:49,017 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-22 22:11:49,018 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-22 22:11:49,019 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-22 22:11:49,023 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-22 22:11:49,036 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-22 22:11:49,037 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-22 22:11:49,039 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-22 22:11:49,040 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationFastUPR_32.epf [2020-08-22 22:11:49,065 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-22 22:11:49,065 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-22 22:11:49,070 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-22 22:11:49,070 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-22 22:11:49,070 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-22 22:11:49,070 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-22 22:11:49,070 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-22 22:11:49,071 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-22 22:11:49,071 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-22 22:11:49,071 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-22 22:11:49,071 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-22 22:11:49,071 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-22 22:11:49,072 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-22 22:11:49,077 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-22 22:11:49,077 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-22 22:11:49,077 INFO L138 SettingsManager]: * Size of a code block=SingleStatement [2020-08-22 22:11:49,078 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-22 22:11:49,078 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-22 22:11:49,078 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-22 22:11:49,078 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-22 22:11:49,078 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=AcceleratedInterpolation [2020-08-22 22:11:49,079 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-22 22:11:49,079 INFO L138 SettingsManager]: * Use separate solver for trace checks=false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use separate solver for trace checks -> true [2020-08-22 22:11:49,413 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-22 22:11:49,427 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-22 22:11:49,433 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-22 22:11:49,435 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-22 22:11:49,435 INFO L275 PluginConnector]: CDTParser initialized [2020-08-22 22:11:49,436 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/sum_2x3-1.c [2020-08-22 22:11:49,515 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/f6a05364a/934c5a5cc5194273a0c97444ef8b32f5/FLAG8e264ab8e [2020-08-22 22:11:49,944 INFO L306 CDTParser]: Found 1 translation units. [2020-08-22 22:11:49,945 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/sum_2x3-1.c [2020-08-22 22:11:49,953 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/f6a05364a/934c5a5cc5194273a0c97444ef8b32f5/FLAG8e264ab8e [2020-08-22 22:11:50,297 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/f6a05364a/934c5a5cc5194273a0c97444ef8b32f5 [2020-08-22 22:11:50,306 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-22 22:11:50,308 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-22 22:11:50,311 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-22 22:11:50,311 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-22 22:11:50,316 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-22 22:11:50,317 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.08 10:11:50" (1/1) ... [2020-08-22 22:11:50,320 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7105da2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 10:11:50, skipping insertion in model container [2020-08-22 22:11:50,321 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.08 10:11:50" (1/1) ... [2020-08-22 22:11:50,329 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-22 22:11:50,351 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-22 22:11:50,520 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-22 22:11:50,524 INFO L203 MainTranslator]: Completed pre-run [2020-08-22 22:11:50,537 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-22 22:11:50,549 INFO L208 MainTranslator]: Completed translation [2020-08-22 22:11:50,550 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 10:11:50 WrapperNode [2020-08-22 22:11:50,550 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-22 22:11:50,551 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-22 22:11:50,551 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-22 22:11:50,551 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-22 22:11:50,562 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 10:11:50" (1/1) ... [2020-08-22 22:11:50,562 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 10:11:50" (1/1) ... [2020-08-22 22:11:50,567 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 10:11:50" (1/1) ... [2020-08-22 22:11:50,567 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 10:11:50" (1/1) ... [2020-08-22 22:11:50,570 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 10:11:50" (1/1) ... [2020-08-22 22:11:50,572 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 10:11:50" (1/1) ... [2020-08-22 22:11:50,573 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 10:11:50" (1/1) ... [2020-08-22 22:11:50,574 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-22 22:11:50,575 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-22 22:11:50,575 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-22 22:11:50,575 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-22 22:11:50,576 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 10:11:50" (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 [2020-08-22 22:11:50,737 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-22 22:11:50,737 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-22 22:11:50,737 INFO L138 BoogieDeclarations]: Found implementation of procedure sum [2020-08-22 22:11:50,738 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-22 22:11:50,738 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-22 22:11:50,738 INFO L130 BoogieDeclarations]: Found specification of procedure sum [2020-08-22 22:11:50,738 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-22 22:11:50,738 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-22 22:11:50,738 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-22 22:11:50,925 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-22 22:11:50,925 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-08-22 22:11:50,931 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.08 10:11:50 BoogieIcfgContainer [2020-08-22 22:11:50,932 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-22 22:11:50,935 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-22 22:11:50,936 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-22 22:11:50,939 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-22 22:11:50,940 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.08 10:11:50" (1/3) ... [2020-08-22 22:11:50,940 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2364c0a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.08 10:11:50, skipping insertion in model container [2020-08-22 22:11:50,941 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 10:11:50" (2/3) ... [2020-08-22 22:11:50,941 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2364c0a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.08 10:11:50, skipping insertion in model container [2020-08-22 22:11:50,941 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.08 10:11:50" (3/3) ... [2020-08-22 22:11:50,943 INFO L109 eAbstractionObserver]: Analyzing ICFG sum_2x3-1.c [2020-08-22 22:11:50,952 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-22 22:11:50,960 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-22 22:11:50,976 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-22 22:11:50,999 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-22 22:11:51,000 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-22 22:11:51,000 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-22 22:11:51,000 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-22 22:11:51,000 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-22 22:11:51,000 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-22 22:11:51,001 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-22 22:11:51,001 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-22 22:11:51,019 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states. [2020-08-22 22:11:51,031 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-08-22 22:11:51,032 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 22:11:51,033 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 22:11:51,033 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 22:11:51,040 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 22:11:51,041 INFO L82 PathProgramCache]: Analyzing trace with hash 989240825, now seen corresponding path program 1 times [2020-08-22 22:11:51,051 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 22:11:51,051 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1821532424] [2020-08-22 22:11:51,052 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 22:11:51,148 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:11:51,208 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 22:11:51,210 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:11:51,215 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-22 22:11:51,222 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:11:51,437 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 22:11:51,440 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1821532424] [2020-08-22 22:11:51,444 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-22 22:11:51,444 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-22 22:11:51,445 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [440095677] [2020-08-22 22:11:51,451 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-22 22:11:51,452 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 22:11:51,467 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-22 22:11:51,468 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-22 22:11:51,470 INFO L87 Difference]: Start difference. First operand 27 states. Second operand 5 states. [2020-08-22 22:11:51,573 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 22:11:51,574 INFO L93 Difference]: Finished difference Result 39 states and 42 transitions. [2020-08-22 22:11:51,575 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-22 22:11:51,576 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 18 [2020-08-22 22:11:51,577 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 22:11:51,586 INFO L225 Difference]: With dead ends: 39 [2020-08-22 22:11:51,587 INFO L226 Difference]: Without dead ends: 25 [2020-08-22 22:11:51,590 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-08-22 22:11:51,609 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2020-08-22 22:11:51,637 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2020-08-22 22:11:51,638 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-08-22 22:11:51,641 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 26 transitions. [2020-08-22 22:11:51,643 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 26 transitions. Word has length 18 [2020-08-22 22:11:51,644 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 22:11:51,645 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 26 transitions. [2020-08-22 22:11:51,645 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-22 22:11:51,645 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 26 transitions. [2020-08-22 22:11:51,650 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-08-22 22:11:51,650 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 22:11:51,651 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] [2020-08-22 22:11:51,651 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-22 22:11:51,651 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 22:11:51,652 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 22:11:51,652 INFO L82 PathProgramCache]: Analyzing trace with hash 1852726759, now seen corresponding path program 1 times [2020-08-22 22:11:51,652 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 22:11:51,653 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2035862453] [2020-08-22 22:11:51,653 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 22:11:51,670 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:11:51,699 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 22:11:51,700 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:11:51,703 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-22 22:11:51,713 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:11:51,756 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-22 22:11:51,761 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:11:51,823 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-08-22 22:11:51,824 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2035862453] [2020-08-22 22:11:51,824 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 22:11:51,824 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-22 22:11:51,825 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [190312479] [2020-08-22 22:11:51,827 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-22 22:11:51,828 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 22:11:51,828 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-22 22:11:51,829 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2020-08-22 22:11:51,829 INFO L87 Difference]: Start difference. First operand 25 states and 26 transitions. Second operand 6 states. [2020-08-22 22:11:51,917 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 22:11:51,918 INFO L93 Difference]: Finished difference Result 36 states and 37 transitions. [2020-08-22 22:11:51,920 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-22 22:11:51,920 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 27 [2020-08-22 22:11:51,921 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 22:11:51,922 INFO L225 Difference]: With dead ends: 36 [2020-08-22 22:11:51,922 INFO L226 Difference]: Without dead ends: 30 [2020-08-22 22:11:51,924 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=20, Invalid=36, Unknown=0, NotChecked=0, Total=56 [2020-08-22 22:11:51,924 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-08-22 22:11:51,934 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2020-08-22 22:11:51,934 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-08-22 22:11:51,936 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 31 transitions. [2020-08-22 22:11:51,936 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 31 transitions. Word has length 27 [2020-08-22 22:11:51,936 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 22:11:51,937 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 31 transitions. [2020-08-22 22:11:51,937 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-22 22:11:51,937 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 31 transitions. [2020-08-22 22:11:51,938 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-08-22 22:11:51,939 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 22:11:51,939 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] [2020-08-22 22:11:51,939 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-22 22:11:51,940 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 22:11:51,940 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 22:11:51,940 INFO L82 PathProgramCache]: Analyzing trace with hash -175020829, now seen corresponding path program 2 times [2020-08-22 22:11:51,941 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 22:11:51,941 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1943525751] [2020-08-22 22:11:51,941 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 22:11:51,963 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-08-22 22:11:51,964 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-08-22 22:11:51,983 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-08-22 22:11:51,984 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-08-22 22:11:52,010 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-08-22 22:11:52,011 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-08-22 22:11:52,011 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-22 22:11:52,058 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 22.08 10:11:52 BoogieIcfgContainer [2020-08-22 22:11:52,059 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-08-22 22:11:52,064 INFO L168 Benchmark]: Toolchain (without parser) took 1753.46 ms. Allocated memory was 138.4 MB in the beginning and 202.4 MB in the end (delta: 64.0 MB). Free memory was 102.8 MB in the beginning and 119.4 MB in the end (delta: -16.7 MB). Peak memory consumption was 47.3 MB. Max. memory is 7.1 GB. [2020-08-22 22:11:52,067 INFO L168 Benchmark]: CDTParser took 0.21 ms. Allocated memory is still 138.4 MB. Free memory was 120.9 MB in the beginning and 120.7 MB in the end (delta: 209.8 kB). Peak memory consumption was 209.8 kB. Max. memory is 7.1 GB. [2020-08-22 22:11:52,068 INFO L168 Benchmark]: CACSL2BoogieTranslator took 239.33 ms. Allocated memory is still 138.4 MB. Free memory was 102.6 MB in the beginning and 92.8 MB in the end (delta: 9.7 MB). Peak memory consumption was 9.7 MB. Max. memory is 7.1 GB. [2020-08-22 22:11:52,069 INFO L168 Benchmark]: Boogie Preprocessor took 23.81 ms. Allocated memory is still 138.4 MB. Free memory was 92.8 MB in the beginning and 91.5 MB in the end (delta: 1.3 MB). Peak memory consumption was 1.3 MB. Max. memory is 7.1 GB. [2020-08-22 22:11:52,071 INFO L168 Benchmark]: RCFGBuilder took 356.74 ms. Allocated memory was 138.4 MB in the beginning and 202.4 MB in the end (delta: 64.0 MB). Free memory was 91.5 MB in the beginning and 170.0 MB in the end (delta: -78.5 MB). Peak memory consumption was 13.5 MB. Max. memory is 7.1 GB. [2020-08-22 22:11:52,073 INFO L168 Benchmark]: TraceAbstraction took 1123.88 ms. Allocated memory is still 202.4 MB. Free memory was 169.4 MB in the beginning and 119.4 MB in the end (delta: 49.9 MB). Peak memory consumption was 49.9 MB. Max. memory is 7.1 GB. [2020-08-22 22:11:52,087 INFO L336 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 138.4 MB. Free memory was 120.9 MB in the beginning and 120.7 MB in the end (delta: 209.8 kB). Peak memory consumption was 209.8 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 239.33 ms. Allocated memory is still 138.4 MB. Free memory was 102.6 MB in the beginning and 92.8 MB in the end (delta: 9.7 MB). Peak memory consumption was 9.7 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 23.81 ms. Allocated memory is still 138.4 MB. Free memory was 92.8 MB in the beginning and 91.5 MB in the end (delta: 1.3 MB). Peak memory consumption was 1.3 MB. Max. memory is 7.1 GB. * RCFGBuilder took 356.74 ms. Allocated memory was 138.4 MB in the beginning and 202.4 MB in the end (delta: 64.0 MB). Free memory was 91.5 MB in the beginning and 170.0 MB in the end (delta: -78.5 MB). Peak memory consumption was 13.5 MB. Max. memory is 7.1 GB. * TraceAbstraction took 1123.88 ms. Allocated memory is still 202.4 MB. Free memory was 169.4 MB in the beginning and 119.4 MB in the end (delta: 49.9 MB). Peak memory consumption was 49.9 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 16]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L12] int a = 2; VAL [a=2] [L13] int b = 3; VAL [a=2, b=3] [L14] CALL, EXPR sum(a, b) VAL [\old(m)=3, \old(n)=2] [L4] COND FALSE !(n <= 0) VAL [\old(m)=3, \old(n)=2, m=3, n=2] [L7] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=4, \old(n)=1] [L4] COND FALSE !(n <= 0) VAL [\old(m)=4, \old(n)=1, m=4, n=1] [L7] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=5, \old(n)=0] [L4] COND TRUE n <= 0 VAL [\old(m)=5, \old(n)=0, m=5, n=0] [L5] return m + n; VAL [\old(m)=5, \old(n)=0, \result=5, m=5, n=0] [L7] RET, EXPR sum(n - 1, m + 1) VAL [\old(m)=4, \old(n)=1, m=4, n=1, sum(n - 1, m + 1)=5] [L7] return sum(n - 1, m + 1); VAL [\old(m)=4, \old(n)=1, \result=5, m=4, n=1, sum(n - 1, m + 1)=5] [L7] RET, EXPR sum(n - 1, m + 1) VAL [\old(m)=3, \old(n)=2, m=3, n=2, sum(n - 1, m + 1)=5] [L7] return sum(n - 1, m + 1); VAL [\old(m)=3, \old(n)=2, \result=5, m=3, n=2, sum(n - 1, m + 1)=5] [L14] RET, EXPR sum(a, b) VAL [a=2, b=3, sum(a, b)=5] [L14] int result = sum(a, b); VAL [a=2, b=3, result=5, sum(a, b)=5] [L15] COND TRUE result == a + b VAL [a=2, b=3, result=5] [L16] __VERIFIER_error() VAL [a=2, b=3, result=5] - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 27 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 1.0s, OverallIterations: 3, TraceHistogramMax: 3, AutomataDifference: 0.2s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 39 SDtfs, 32 SDslu, 84 SDs, 0 SdLazy, 48 SolverSat, 1 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.0s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 22 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.3s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=30occurred in iteration=2, 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, 0.0s SatisfiabilityAnalysisTime, 0.4s InterpolantComputationTime, 81 NumberOfCodeBlocks, 81 NumberOfCodeBlocksAsserted, 3 NumberOfCheckSat, 43 ConstructedInterpolants, 0 QuantifiedInterpolants, 1983 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 2 InterpolantComputations, 1 PerfectInterpolantSequences, 3/5 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...