/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks NOT_INCREMENTALLY -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/recursive-simple/sum_10x0-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 11:16:32,414 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 11:16:32,417 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 11:16:32,436 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-20 11:16:32,436 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 11:16:32,439 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 11:16:32,441 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 11:16:32,450 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 11:16:32,455 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 11:16:32,458 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 11:16:32,459 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 11:16:32,460 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 11:16:32,461 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 11:16:32,461 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 11:16:32,462 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 11:16:32,463 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 11:16:32,464 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 11:16:32,465 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 11:16:32,467 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 11:16:32,471 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 11:16:32,473 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 11:16:32,474 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 11:16:32,477 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 11:16:32,478 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 11:16:32,480 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-20 11:16:32,494 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 11:16:32,495 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 11:16:32,496 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 11:16:32,497 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 [2020-07-20 11:16:32,538 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 11:16:32,539 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 11:16:32,541 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 11:16:32,541 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 11:16:32,541 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 11:16:32,542 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 11:16:32,542 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 11:16:32,542 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 11:16:32,542 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 11:16:32,542 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 11:16:32,542 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 11:16:32,543 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 11:16:32,543 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 11:16:32,543 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 11:16:32,543 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 11:16:32,543 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 11:16:32,544 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 11:16:32,544 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 11:16:32,544 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 11:16:32,544 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 11:16:32,544 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 11:16:32,544 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 11:16:32,545 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 11:16:32,545 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 11:16:32,545 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 11:16:32,545 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 11:16:32,545 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:16:32,546 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 11:16:32,546 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 11:16:32,546 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> NOT_INCREMENTALLY [2020-07-20 11:16:32,877 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 11:16:32,902 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 11:16:32,906 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 11:16:32,907 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 11:16:32,907 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 11:16:32,908 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/sum_10x0-2.c [2020-07-20 11:16:32,976 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ae9e1e6fd/41fb28427a5f40eab87b2f03b9c30cb9/FLAG7b9cc2830 [2020-07-20 11:16:33,433 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 11:16:33,433 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/sum_10x0-2.c [2020-07-20 11:16:33,440 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ae9e1e6fd/41fb28427a5f40eab87b2f03b9c30cb9/FLAG7b9cc2830 [2020-07-20 11:16:33,806 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ae9e1e6fd/41fb28427a5f40eab87b2f03b9c30cb9 [2020-07-20 11:16:33,816 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 11:16:33,819 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 11:16:33,821 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 11:16:33,821 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 11:16:33,825 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 11:16:33,826 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 11:16:33" (1/1) ... [2020-07-20 11:16:33,829 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@675c35e0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:16:33, skipping insertion in model container [2020-07-20 11:16:33,829 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 11:16:33" (1/1) ... [2020-07-20 11:16:33,838 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 11:16:33,855 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 11:16:34,023 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 11:16:34,027 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 11:16:34,047 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 11:16:34,059 INFO L208 MainTranslator]: Completed translation [2020-07-20 11:16:34,060 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:16:34 WrapperNode [2020-07-20 11:16:34,060 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 11:16:34,061 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 11:16:34,061 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 11:16:34,061 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 11:16:34,071 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:16:34" (1/1) ... [2020-07-20 11:16:34,071 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:16:34" (1/1) ... [2020-07-20 11:16:34,076 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:16:34" (1/1) ... [2020-07-20 11:16:34,077 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:16:34" (1/1) ... [2020-07-20 11:16:34,080 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:16:34" (1/1) ... [2020-07-20 11:16:34,082 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:16:34" (1/1) ... [2020-07-20 11:16:34,083 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:16:34" (1/1) ... [2020-07-20 11:16:34,084 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 11:16:34,085 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 11:16:34,085 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 11:16:34,085 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 11:16:34,086 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:16:34" (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 [2020-07-20 11:16:34,242 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 11:16:34,242 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 11:16:34,243 INFO L138 BoogieDeclarations]: Found implementation of procedure sum [2020-07-20 11:16:34,243 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 11:16:34,243 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 11:16:34,243 INFO L130 BoogieDeclarations]: Found specification of procedure sum [2020-07-20 11:16:34,243 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 11:16:34,243 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 11:16:34,243 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 11:16:34,437 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 11:16:34,438 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-20 11:16:34,442 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 11:16:34 BoogieIcfgContainer [2020-07-20 11:16:34,443 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 11:16:34,444 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 11:16:34,444 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 11:16:34,448 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 11:16:34,448 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 11:16:33" (1/3) ... [2020-07-20 11:16:34,449 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2090a76 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 11:16:34, skipping insertion in model container [2020-07-20 11:16:34,450 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:16:34" (2/3) ... [2020-07-20 11:16:34,450 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2090a76 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 11:16:34, skipping insertion in model container [2020-07-20 11:16:34,450 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 11:16:34" (3/3) ... [2020-07-20 11:16:34,453 INFO L109 eAbstractionObserver]: Analyzing ICFG sum_10x0-2.c [2020-07-20 11:16:34,467 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 11:16:34,499 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 11:16:34,533 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 11:16:34,582 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 11:16:34,582 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 11:16:34,582 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 11:16:34,582 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 11:16:34,582 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 11:16:34,583 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 11:16:34,583 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 11:16:34,583 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 11:16:34,602 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states. [2020-07-20 11:16:34,608 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-20 11:16:34,609 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:16:34,610 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:16:34,611 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:16:34,616 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:16:34,616 INFO L82 PathProgramCache]: Analyzing trace with hash 2001781660, now seen corresponding path program 1 times [2020-07-20 11:16:34,623 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:16:34,624 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1982319312] [2020-07-20 11:16:34,624 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 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:16:34,682 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:16:34,685 INFO L263 TraceCheckSpWp]: Trace formula consists of 37 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 11:16:34,692 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:16:34,786 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 11:16:34,787 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 11:16:34,788 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1982319312] [2020-07-20 11:16:34,789 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 11:16:34,789 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 11:16:34,790 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [221109190] [2020-07-20 11:16:34,795 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 11:16:34,796 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:16:34,811 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 11:16:34,812 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 11:16:34,814 INFO L87 Difference]: Start difference. First operand 20 states. Second operand 5 states. [2020-07-20 11:16:34,915 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:16:34,916 INFO L93 Difference]: Finished difference Result 30 states and 33 transitions. [2020-07-20 11:16:34,917 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 11:16:34,919 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-20 11:16:34,919 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:16:34,930 INFO L225 Difference]: With dead ends: 30 [2020-07-20 11:16:34,934 INFO L226 Difference]: Without dead ends: 18 [2020-07-20 11:16:34,938 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-20 11:16:34,961 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-07-20 11:16:34,994 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2020-07-20 11:16:34,996 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-07-20 11:16:34,997 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2020-07-20 11:16:34,998 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 13 [2020-07-20 11:16:34,999 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:16:34,999 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2020-07-20 11:16:34,999 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 11:16:35,000 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2020-07-20 11:16:35,001 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-07-20 11:16:35,002 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:16:35,002 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:16:35,208 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:16:35,209 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:16:35,210 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:16:35,210 INFO L82 PathProgramCache]: Analyzing trace with hash -118151420, now seen corresponding path program 1 times [2020-07-20 11:16:35,211 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:16:35,212 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2083891667] [2020-07-20 11:16:35,213 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:16:35,256 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:16:35,258 INFO L263 TraceCheckSpWp]: Trace formula consists of 55 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-20 11:16:35,260 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:16:35,311 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-07-20 11:16:35,312 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:16:35,494 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:16:35,547 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 11:16:35,548 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2083891667] [2020-07-20 11:16:35,549 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:16:35,549 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 9 [2020-07-20 11:16:35,549 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1928988835] [2020-07-20 11:16:35,551 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-20 11:16:35,552 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:16:35,552 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-20 11:16:35,553 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-07-20 11:16:35,553 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand 9 states. [2020-07-20 11:16:35,636 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:16:35,637 INFO L93 Difference]: Finished difference Result 25 states and 26 transitions. [2020-07-20 11:16:35,637 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-20 11:16:35,638 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 19 [2020-07-20 11:16:35,638 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:16:35,639 INFO L225 Difference]: With dead ends: 25 [2020-07-20 11:16:35,639 INFO L226 Difference]: Without dead ends: 21 [2020-07-20 11:16:35,641 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 26 SyntacticMatches, 4 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=74, Unknown=0, NotChecked=0, Total=110 [2020-07-20 11:16:35,642 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-07-20 11:16:35,647 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-07-20 11:16:35,647 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-07-20 11:16:35,648 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2020-07-20 11:16:35,648 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 19 [2020-07-20 11:16:35,649 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:16:35,649 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2020-07-20 11:16:35,649 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-20 11:16:35,649 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2020-07-20 11:16:35,650 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-07-20 11:16:35,651 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:16:35,651 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:16:35,865 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:16:35,866 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:16:35,867 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:16:35,867 INFO L82 PathProgramCache]: Analyzing trace with hash 764931548, now seen corresponding path program 2 times [2020-07-20 11:16:35,868 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:16:35,868 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1540932419] [2020-07-20 11:16:35,869 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:16:35,912 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:16:35,913 INFO L263 TraceCheckSpWp]: Trace formula consists of 73 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 11:16:35,917 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:16:35,979 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2020-07-20 11:16:35,980 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:16:36,216 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:16:36,218 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:16:36,262 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:16:36,263 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:16:36,296 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-07-20 11:16:36,296 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1540932419] [2020-07-20 11:16:36,297 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:16:36,297 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9] total 11 [2020-07-20 11:16:36,297 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1698184938] [2020-07-20 11:16:36,298 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-20 11:16:36,298 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:16:36,298 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-20 11:16:36,299 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2020-07-20 11:16:36,299 INFO L87 Difference]: Start difference. First operand 21 states and 22 transitions. Second operand 11 states. [2020-07-20 11:16:36,368 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:16:36,368 INFO L93 Difference]: Finished difference Result 28 states and 29 transitions. [2020-07-20 11:16:36,369 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-20 11:16:36,369 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 25 [2020-07-20 11:16:36,369 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:16:36,370 INFO L225 Difference]: With dead ends: 28 [2020-07-20 11:16:36,370 INFO L226 Difference]: Without dead ends: 24 [2020-07-20 11:16:36,371 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 34 SyntacticMatches, 6 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=59, Invalid=123, Unknown=0, NotChecked=0, Total=182 [2020-07-20 11:16:36,372 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-07-20 11:16:36,376 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2020-07-20 11:16:36,376 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-07-20 11:16:36,377 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 25 transitions. [2020-07-20 11:16:36,378 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 25 transitions. Word has length 25 [2020-07-20 11:16:36,378 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:16:36,378 INFO L479 AbstractCegarLoop]: Abstraction has 24 states and 25 transitions. [2020-07-20 11:16:36,378 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-20 11:16:36,379 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 25 transitions. [2020-07-20 11:16:36,379 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-07-20 11:16:36,380 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:16:36,380 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:16:36,593 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:16:36,594 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:16:36,594 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:16:36,595 INFO L82 PathProgramCache]: Analyzing trace with hash 601942852, now seen corresponding path program 3 times [2020-07-20 11:16:36,595 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:16:36,596 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [623598013] [2020-07-20 11:16:36,596 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:16:36,628 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:16:36,630 INFO L263 TraceCheckSpWp]: Trace formula consists of 91 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 11:16:36,632 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:16:36,701 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2020-07-20 11:16:36,702 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:16:37,063 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:16:37,065 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:16:37,161 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:16:37,218 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:16:37,220 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:16:37,263 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2020-07-20 11:16:37,264 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [623598013] [2020-07-20 11:16:37,265 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:16:37,265 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 11] total 13 [2020-07-20 11:16:37,265 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [640923139] [2020-07-20 11:16:37,266 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-20 11:16:37,266 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:16:37,267 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-20 11:16:37,267 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2020-07-20 11:16:37,267 INFO L87 Difference]: Start difference. First operand 24 states and 25 transitions. Second operand 13 states. [2020-07-20 11:16:37,357 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:16:37,357 INFO L93 Difference]: Finished difference Result 31 states and 32 transitions. [2020-07-20 11:16:37,357 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 11:16:37,357 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 31 [2020-07-20 11:16:37,358 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:16:37,359 INFO L225 Difference]: With dead ends: 31 [2020-07-20 11:16:37,359 INFO L226 Difference]: Without dead ends: 27 [2020-07-20 11:16:37,359 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 42 SyntacticMatches, 8 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=88, Invalid=184, Unknown=0, NotChecked=0, Total=272 [2020-07-20 11:16:37,360 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2020-07-20 11:16:37,364 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2020-07-20 11:16:37,364 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-07-20 11:16:37,365 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 28 transitions. [2020-07-20 11:16:37,365 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 28 transitions. Word has length 31 [2020-07-20 11:16:37,366 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:16:37,366 INFO L479 AbstractCegarLoop]: Abstraction has 27 states and 28 transitions. [2020-07-20 11:16:37,366 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-20 11:16:37,366 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 28 transitions. [2020-07-20 11:16:37,367 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-07-20 11:16:37,367 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:16:37,368 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:16:37,570 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:16:37,571 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:16:37,572 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:16:37,572 INFO L82 PathProgramCache]: Analyzing trace with hash -183109604, now seen corresponding path program 4 times [2020-07-20 11:16:37,572 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:16:37,573 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1630384385] [2020-07-20 11:16:37,573 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:16:37,614 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:16:37,615 INFO L263 TraceCheckSpWp]: Trace formula consists of 109 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 11:16:37,618 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:16:37,675 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2020-07-20 11:16:37,675 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:16:38,232 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:16:38,392 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:16:38,394 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:16:38,501 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:16:38,552 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:16:38,596 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2020-07-20 11:16:38,596 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1630384385] [2020-07-20 11:16:38,597 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:16:38,597 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 13] total 15 [2020-07-20 11:16:38,597 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [843993296] [2020-07-20 11:16:38,598 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-20 11:16:38,598 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:16:38,598 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-20 11:16:38,599 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=152, Unknown=0, NotChecked=0, Total=210 [2020-07-20 11:16:38,599 INFO L87 Difference]: Start difference. First operand 27 states and 28 transitions. Second operand 15 states. [2020-07-20 11:16:38,710 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:16:38,710 INFO L93 Difference]: Finished difference Result 34 states and 35 transitions. [2020-07-20 11:16:38,711 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 11:16:38,711 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 37 [2020-07-20 11:16:38,712 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:16:38,713 INFO L225 Difference]: With dead ends: 34 [2020-07-20 11:16:38,713 INFO L226 Difference]: Without dead ends: 30 [2020-07-20 11:16:38,714 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 50 SyntacticMatches, 10 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=123, Invalid=257, Unknown=0, NotChecked=0, Total=380 [2020-07-20 11:16:38,715 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-07-20 11:16:38,720 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2020-07-20 11:16:38,720 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-20 11:16:38,721 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 31 transitions. [2020-07-20 11:16:38,721 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 31 transitions. Word has length 37 [2020-07-20 11:16:38,722 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:16:38,722 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 31 transitions. [2020-07-20 11:16:38,722 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-20 11:16:38,722 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 31 transitions. [2020-07-20 11:16:38,723 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-07-20 11:16:38,724 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:16:38,724 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:16:38,927 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:16:38,928 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:16:38,929 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:16:38,929 INFO L82 PathProgramCache]: Analyzing trace with hash -155447420, now seen corresponding path program 5 times [2020-07-20 11:16:38,930 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:16:38,931 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [409047597] [2020-07-20 11:16:38,932 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:16:38,978 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:16:38,979 INFO L263 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 11:16:38,981 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:16:39,057 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2020-07-20 11:16:39,062 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:16:39,894 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:16:39,897 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:16:40,105 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:16:40,254 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:16:40,347 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:16:40,349 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:16:40,405 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:16:40,448 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 65 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2020-07-20 11:16:40,449 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [409047597] [2020-07-20 11:16:40,449 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:16:40,449 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 15] total 17 [2020-07-20 11:16:40,450 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [974266523] [2020-07-20 11:16:40,451 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-20 11:16:40,451 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:16:40,451 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-20 11:16:40,452 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=198, Unknown=0, NotChecked=0, Total=272 [2020-07-20 11:16:40,452 INFO L87 Difference]: Start difference. First operand 30 states and 31 transitions. Second operand 17 states. [2020-07-20 11:16:40,624 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:16:40,625 INFO L93 Difference]: Finished difference Result 37 states and 38 transitions. [2020-07-20 11:16:40,627 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 11:16:40,627 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 43 [2020-07-20 11:16:40,628 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:16:40,629 INFO L225 Difference]: With dead ends: 37 [2020-07-20 11:16:40,629 INFO L226 Difference]: Without dead ends: 33 [2020-07-20 11:16:40,630 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 58 SyntacticMatches, 12 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 102 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=164, Invalid=342, Unknown=0, NotChecked=0, Total=506 [2020-07-20 11:16:40,630 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-07-20 11:16:40,635 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2020-07-20 11:16:40,635 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-07-20 11:16:40,636 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 34 transitions. [2020-07-20 11:16:40,636 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 34 transitions. Word has length 43 [2020-07-20 11:16:40,637 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:16:40,637 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 34 transitions. [2020-07-20 11:16:40,637 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-20 11:16:40,637 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 34 transitions. [2020-07-20 11:16:40,638 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2020-07-20 11:16:40,639 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:16:40,639 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:16:40,845 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:16:40,846 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:16:40,847 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:16:40,847 INFO L82 PathProgramCache]: Analyzing trace with hash 1716183644, now seen corresponding path program 6 times [2020-07-20 11:16:40,847 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:16:40,848 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [298313628] [2020-07-20 11:16:40,848 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:16:40,911 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:16:40,913 INFO L263 TraceCheckSpWp]: Trace formula consists of 145 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 11:16:40,916 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:16:41,023 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2020-07-20 11:16:41,024 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:16:42,199 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:16:42,200 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:16:42,526 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:16:42,737 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:16:42,882 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:16:42,966 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:16:43,024 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:16:43,078 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 0 proven. 93 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-07-20 11:16:43,079 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [298313628] [2020-07-20 11:16:43,079 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:16:43,080 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 17] total 19 [2020-07-20 11:16:43,080 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1440070663] [2020-07-20 11:16:43,083 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-20 11:16:43,083 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:16:43,083 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-20 11:16:43,084 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=250, Unknown=0, NotChecked=0, Total=342 [2020-07-20 11:16:43,084 INFO L87 Difference]: Start difference. First operand 33 states and 34 transitions. Second operand 19 states. [2020-07-20 11:16:43,287 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:16:43,287 INFO L93 Difference]: Finished difference Result 40 states and 41 transitions. [2020-07-20 11:16:43,288 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 11:16:43,288 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 49 [2020-07-20 11:16:43,289 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:16:43,290 INFO L225 Difference]: With dead ends: 40 [2020-07-20 11:16:43,290 INFO L226 Difference]: Without dead ends: 36 [2020-07-20 11:16:43,291 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 104 GetRequests, 66 SyntacticMatches, 14 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 140 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=211, Invalid=439, Unknown=0, NotChecked=0, Total=650 [2020-07-20 11:16:43,291 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-07-20 11:16:43,296 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2020-07-20 11:16:43,296 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-07-20 11:16:43,297 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 37 transitions. [2020-07-20 11:16:43,297 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 37 transitions. Word has length 49 [2020-07-20 11:16:43,297 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:16:43,298 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 37 transitions. [2020-07-20 11:16:43,298 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-20 11:16:43,298 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 37 transitions. [2020-07-20 11:16:43,299 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2020-07-20 11:16:43,299 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:16:43,300 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:16:43,512 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:16:43,513 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:16:43,514 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:16:43,514 INFO L82 PathProgramCache]: Analyzing trace with hash -1079602236, now seen corresponding path program 7 times [2020-07-20 11:16:43,514 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:16:43,515 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [28762684] [2020-07-20 11:16:43,515 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:16:43,594 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:16:43,595 INFO L263 TraceCheckSpWp]: Trace formula consists of 163 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 11:16:43,598 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:16:43,697 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2020-07-20 11:16:43,697 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:16:45,297 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:16:45,809 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:16:46,165 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:16:46,383 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:16:46,528 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:16:46,529 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:16:46,615 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:16:46,663 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:16:46,664 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:16:46,706 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2020-07-20 11:16:46,706 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [28762684] [2020-07-20 11:16:46,706 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:16:46,707 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 19] total 21 [2020-07-20 11:16:46,707 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1991685301] [2020-07-20 11:16:46,707 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 11:16:46,708 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:16:46,708 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 11:16:46,708 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=308, Unknown=0, NotChecked=0, Total=420 [2020-07-20 11:16:46,708 INFO L87 Difference]: Start difference. First operand 36 states and 37 transitions. Second operand 21 states. [2020-07-20 11:16:46,922 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:16:46,922 INFO L93 Difference]: Finished difference Result 43 states and 44 transitions. [2020-07-20 11:16:46,923 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 11:16:46,924 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 55 [2020-07-20 11:16:46,924 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:16:46,926 INFO L225 Difference]: With dead ends: 43 [2020-07-20 11:16:46,926 INFO L226 Difference]: Without dead ends: 39 [2020-07-20 11:16:46,927 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 117 GetRequests, 74 SyntacticMatches, 16 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 184 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=264, Invalid=548, Unknown=0, NotChecked=0, Total=812 [2020-07-20 11:16:46,928 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-07-20 11:16:46,932 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2020-07-20 11:16:46,933 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-07-20 11:16:46,934 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 40 transitions. [2020-07-20 11:16:46,934 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 40 transitions. Word has length 55 [2020-07-20 11:16:46,934 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:16:46,935 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 40 transitions. [2020-07-20 11:16:46,935 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 11:16:46,935 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 40 transitions. [2020-07-20 11:16:46,936 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2020-07-20 11:16:46,936 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:16:46,936 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:16:47,144 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:16:47,144 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:16:47,145 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:16:47,145 INFO L82 PathProgramCache]: Analyzing trace with hash 1035381916, now seen corresponding path program 8 times [2020-07-20 11:16:47,145 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:16:47,146 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [915251558] [2020-07-20 11:16:47,146 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:16:47,249 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:16:47,250 INFO L263 TraceCheckSpWp]: Trace formula consists of 181 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-20 11:16:47,253 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:16:47,370 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2020-07-20 11:16:47,371 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:16:49,512 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:16:49,513 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:16:50,207 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:16:50,730 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:16:50,731 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:16:51,054 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:16:51,055 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:16:51,251 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:16:51,252 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:16:51,392 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:16:51,393 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:16:51,477 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:16:51,479 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:16:51,525 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:16:51,592 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 164 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2020-07-20 11:16:51,593 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [915251558] [2020-07-20 11:16:51,593 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:16:51,593 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 21] total 23 [2020-07-20 11:16:51,593 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2142091565] [2020-07-20 11:16:51,595 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-20 11:16:51,595 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:16:51,596 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-20 11:16:51,596 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=372, Unknown=0, NotChecked=0, Total=506 [2020-07-20 11:16:51,596 INFO L87 Difference]: Start difference. First operand 39 states and 40 transitions. Second operand 23 states. [2020-07-20 11:16:51,803 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:16:51,804 INFO L93 Difference]: Finished difference Result 46 states and 47 transitions. [2020-07-20 11:16:51,804 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 11:16:51,804 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 61 [2020-07-20 11:16:51,805 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:16:51,806 INFO L225 Difference]: With dead ends: 46 [2020-07-20 11:16:51,807 INFO L226 Difference]: Without dead ends: 42 [2020-07-20 11:16:51,808 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 130 GetRequests, 82 SyntacticMatches, 18 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 234 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=323, Invalid=669, Unknown=0, NotChecked=0, Total=992 [2020-07-20 11:16:51,808 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-07-20 11:16:51,813 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2020-07-20 11:16:51,813 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-07-20 11:16:51,814 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 43 transitions. [2020-07-20 11:16:51,814 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 43 transitions. Word has length 61 [2020-07-20 11:16:51,814 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:16:51,814 INFO L479 AbstractCegarLoop]: Abstraction has 42 states and 43 transitions. [2020-07-20 11:16:51,814 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-20 11:16:51,815 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 43 transitions. [2020-07-20 11:16:51,816 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2020-07-20 11:16:51,816 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:16:51,816 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:16:52,023 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:16:52,023 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:16:52,024 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:16:52,024 INFO L82 PathProgramCache]: Analyzing trace with hash 952137732, now seen corresponding path program 9 times [2020-07-20 11:16:52,024 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:16:52,025 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [357290083] [2020-07-20 11:16:52,025 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:16:52,164 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:16:52,166 INFO L263 TraceCheckSpWp]: Trace formula consists of 199 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-20 11:16:52,168 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:16:52,288 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2020-07-20 11:16:52,288 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:16:55,107 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:16:55,108 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:16:56,085 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:16:56,831 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:16:57,337 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:16:57,671 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:16:57,904 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:16:57,905 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:16:58,051 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:16:58,141 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:16:58,141 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:16:58,204 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:16:58,204 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:16:58,255 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 0 proven. 207 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2020-07-20 11:16:58,256 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [357290083] [2020-07-20 11:16:58,256 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:16:58,257 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 23] total 24 [2020-07-20 11:16:58,257 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [776526126] [2020-07-20 11:16:58,258 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-07-20 11:16:58,258 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:16:58,258 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-07-20 11:16:58,258 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=155, Invalid=397, Unknown=0, NotChecked=0, Total=552 [2020-07-20 11:16:58,259 INFO L87 Difference]: Start difference. First operand 42 states and 43 transitions. Second operand 24 states. [2020-07-20 11:16:58,479 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:16:58,480 INFO L93 Difference]: Finished difference Result 49 states and 50 transitions. [2020-07-20 11:16:58,480 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-20 11:16:58,481 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 67 [2020-07-20 11:16:58,482 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:16:58,483 INFO L225 Difference]: With dead ends: 49 [2020-07-20 11:16:58,483 INFO L226 Difference]: Without dead ends: 45 [2020-07-20 11:16:58,485 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 143 GetRequests, 90 SyntacticMatches, 21 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 261 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=385, Invalid=737, Unknown=0, NotChecked=0, Total=1122 [2020-07-20 11:16:58,486 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2020-07-20 11:16:58,490 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2020-07-20 11:16:58,491 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-07-20 11:16:58,492 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 46 transitions. [2020-07-20 11:16:58,492 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 46 transitions. Word has length 67 [2020-07-20 11:16:58,492 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:16:58,493 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 46 transitions. [2020-07-20 11:16:58,493 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-07-20 11:16:58,493 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 46 transitions. [2020-07-20 11:16:58,494 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2020-07-20 11:16:58,494 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:16:58,495 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:16:58,697 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:16:58,698 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:16:58,699 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:16:58,699 INFO L82 PathProgramCache]: Analyzing trace with hash 1540970204, now seen corresponding path program 10 times [2020-07-20 11:16:58,700 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:16:58,700 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1369606098] [2020-07-20 11:16:58,700 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:16:58,895 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-07-20 11:16:58,895 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-20 11:16:58,913 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-07-20 11:16:58,914 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-20 11:16:58,948 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-07-20 11:16:58,949 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-07-20 11:16:59,163 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:16:59,207 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 20.07 11:16:59 BoogieIcfgContainer [2020-07-20 11:16:59,208 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-20 11:16:59,211 INFO L168 Benchmark]: Toolchain (without parser) took 25392.66 ms. Allocated memory was 136.8 MB in the beginning and 426.2 MB in the end (delta: 289.4 MB). Free memory was 101.9 MB in the beginning and 263.2 MB in the end (delta: -161.2 MB). Peak memory consumption was 128.2 MB. Max. memory is 7.1 GB. [2020-07-20 11:16:59,212 INFO L168 Benchmark]: CDTParser took 0.19 ms. Allocated memory is still 136.8 MB. Free memory was 119.9 MB in the beginning and 119.7 MB in the end (delta: 209.7 kB). Peak memory consumption was 209.7 kB. Max. memory is 7.1 GB. [2020-07-20 11:16:59,213 INFO L168 Benchmark]: CACSL2BoogieTranslator took 239.74 ms. Allocated memory is still 136.8 MB. Free memory was 101.5 MB in the beginning and 92.3 MB in the end (delta: 9.2 MB). Peak memory consumption was 9.2 MB. Max. memory is 7.1 GB. [2020-07-20 11:16:59,213 INFO L168 Benchmark]: Boogie Preprocessor took 23.74 ms. Allocated memory is still 136.8 MB. Free memory was 92.3 MB in the beginning and 91.0 MB in the end (delta: 1.3 MB). Peak memory consumption was 1.3 MB. Max. memory is 7.1 GB. [2020-07-20 11:16:59,214 INFO L168 Benchmark]: RCFGBuilder took 358.06 ms. Allocated memory was 136.8 MB in the beginning and 200.8 MB in the end (delta: 64.0 MB). Free memory was 91.0 MB in the beginning and 169.2 MB in the end (delta: -78.2 MB). Peak memory consumption was 13.8 MB. Max. memory is 7.1 GB. [2020-07-20 11:16:59,215 INFO L168 Benchmark]: TraceAbstraction took 24763.57 ms. Allocated memory was 200.8 MB in the beginning and 426.2 MB in the end (delta: 225.4 MB). Free memory was 168.5 MB in the beginning and 263.2 MB in the end (delta: -94.6 MB). Peak memory consumption was 130.8 MB. Max. memory is 7.1 GB. [2020-07-20 11:16:59,219 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.19 ms. Allocated memory is still 136.8 MB. Free memory was 119.9 MB in the beginning and 119.7 MB in the end (delta: 209.7 kB). Peak memory consumption was 209.7 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 239.74 ms. Allocated memory is still 136.8 MB. Free memory was 101.5 MB in the beginning and 92.3 MB in the end (delta: 9.2 MB). Peak memory consumption was 9.2 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 23.74 ms. Allocated memory is still 136.8 MB. Free memory was 92.3 MB in the beginning and 91.0 MB in the end (delta: 1.3 MB). Peak memory consumption was 1.3 MB. Max. memory is 7.1 GB. * RCFGBuilder took 358.06 ms. Allocated memory was 136.8 MB in the beginning and 200.8 MB in the end (delta: 64.0 MB). Free memory was 91.0 MB in the beginning and 169.2 MB in the end (delta: -78.2 MB). Peak memory consumption was 13.8 MB. Max. memory is 7.1 GB. * TraceAbstraction took 24763.57 ms. Allocated memory was 200.8 MB in the beginning and 426.2 MB in the end (delta: 225.4 MB). Free memory was 168.5 MB in the beginning and 263.2 MB in the end (delta: -94.6 MB). Peak memory consumption was 130.8 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 = 10; [L13] int b = 0; VAL [a=10, b=0] [L14] CALL, EXPR sum(a, b) VAL [\old(m)=0, \old(n)=10] [L4] COND FALSE !(n <= 0) VAL [\old(m)=0, \old(n)=10, m=0, n=10] [L7] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=1, \old(n)=9] [L4] COND FALSE !(n <= 0) VAL [\old(m)=1, \old(n)=9, m=1, n=9] [L7] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=2, \old(n)=8] [L4] COND FALSE !(n <= 0) VAL [\old(m)=2, \old(n)=8, m=2, n=8] [L7] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=3, \old(n)=7] [L4] COND FALSE !(n <= 0) VAL [\old(m)=3, \old(n)=7, m=3, n=7] [L7] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=4, \old(n)=6] [L4] COND FALSE !(n <= 0) VAL [\old(m)=4, \old(n)=6, m=4, n=6] [L7] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=5, \old(n)=5] [L4] COND FALSE !(n <= 0) VAL [\old(m)=5, \old(n)=5, m=5, n=5] [L7] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=6, \old(n)=4] [L4] COND FALSE !(n <= 0) VAL [\old(m)=6, \old(n)=4, m=6, n=4] [L7] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=7, \old(n)=3] [L4] COND FALSE !(n <= 0) VAL [\old(m)=7, \old(n)=3, m=7, n=3] [L7] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=8, \old(n)=2] [L4] COND FALSE !(n <= 0) VAL [\old(m)=8, \old(n)=2, m=8, n=2] [L7] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=9, \old(n)=1] [L4] COND FALSE !(n <= 0) VAL [\old(m)=9, \old(n)=1, m=9, n=1] [L7] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=10, \old(n)=0] [L4] COND TRUE n <= 0 [L5] return m + n; VAL [\old(m)=10, \old(n)=0, \result=10, m=10, n=0] [L7] RET, EXPR sum(n - 1, m + 1) VAL [\old(m)=9, \old(n)=1, m=9, n=1, sum(n - 1, m + 1)=10] [L7] return sum(n - 1, m + 1); [L7] RET, EXPR sum(n - 1, m + 1) VAL [\old(m)=8, \old(n)=2, m=8, n=2, sum(n - 1, m + 1)=10] [L7] return sum(n - 1, m + 1); [L7] RET, EXPR sum(n - 1, m + 1) VAL [\old(m)=7, \old(n)=3, m=7, n=3, sum(n - 1, m + 1)=10] [L7] return sum(n - 1, m + 1); [L7] RET, EXPR sum(n - 1, m + 1) VAL [\old(m)=6, \old(n)=4, m=6, n=4, sum(n - 1, m + 1)=10] [L7] return sum(n - 1, m + 1); [L7] RET, EXPR sum(n - 1, m + 1) VAL [\old(m)=5, \old(n)=5, m=5, n=5, sum(n - 1, m + 1)=10] [L7] return sum(n - 1, m + 1); [L7] RET, EXPR sum(n - 1, m + 1) VAL [\old(m)=4, \old(n)=6, m=4, n=6, sum(n - 1, m + 1)=10] [L7] return sum(n - 1, m + 1); [L7] RET, EXPR sum(n - 1, m + 1) VAL [\old(m)=3, \old(n)=7, m=3, n=7, sum(n - 1, m + 1)=10] [L7] return sum(n - 1, m + 1); [L7] RET, EXPR sum(n - 1, m + 1) VAL [\old(m)=2, \old(n)=8, m=2, n=8, sum(n - 1, m + 1)=10] [L7] return sum(n - 1, m + 1); [L7] RET, EXPR sum(n - 1, m + 1) VAL [\old(m)=1, \old(n)=9, m=1, n=9, sum(n - 1, m + 1)=10] [L7] return sum(n - 1, m + 1); [L7] RET, EXPR sum(n - 1, m + 1) VAL [\old(m)=0, \old(n)=10, m=0, n=10, sum(n - 1, m + 1)=10] [L7] return sum(n - 1, m + 1); [L14] RET, EXPR sum(a, b) VAL [a=10, b=0, sum(a, b)=10] [L14] int result = sum(a, b); [L15] COND TRUE result == a + b VAL [a=10, b=0, result=10] [L16] __VERIFIER_error() VAL [a=10, b=0, result=10] - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 20 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 24.5s, OverallIterations: 11, TraceHistogramMax: 11, AutomataDifference: 1.5s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 123 SDtfs, 510 SDslu, 699 SDs, 0 SdLazy, 472 SolverSat, 197 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.5s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 832 GetRequests, 531 SyntacticMatches, 109 SemanticMatches, 192 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1069 ImplicationChecksByTransitivity, 2.8s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=45occurred in iteration=10, 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, 10 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.1s SatisfiabilityAnalysisTime, 19.5s InterpolantComputationTime, 473 NumberOfCodeBlocks, 473 NumberOfCodeBlocksAsserted, 11 NumberOfCheckSat, 768 ConstructedInterpolants, 0 QuantifiedInterpolants, 106872 SizeOfPredicates, 65 NumberOfNonLiveVariables, 1180 ConjunctsInSsa, 130 ConjunctsInUnsatCore, 19 InterpolantComputations, 1 PerfectInterpolantSequences, 615/1800 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...