/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/ldv-regression/test_while_int.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 11:22:37,848 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 11:22:37,850 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 11:22:37,869 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2020-07-21 11:22:37,891 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 11:22:37,896 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 11:22:37,897 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 11:22:37,898 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 11:22:37,899 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 11:22:37,901 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 11:22:37,903 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 11:22:37,907 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 11:22:37,909 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 11:22:37,912 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 11:22:37,913 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 11:22:37,914 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 11:22:37,919 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 11:22:37,934 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 [2020-07-21 11:22:37,958 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 11:22:37,958 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 11:22:37,960 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 11:22:37,961 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 11:22:37,961 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 11:22:37,961 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 11:22:37,961 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 11:22:37,962 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 11:22:37,962 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 11:22:37,962 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 11:22:37,963 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 11:22:37,963 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 11:22:37,964 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 11:22:37,964 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 11:22:37,964 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 11:22:37,965 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 11:22:37,965 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 11:22:37,965 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 11:22:37,965 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 11:22:37,965 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 11:22:37,966 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 11:22:37,966 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 11:22:37,966 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 11:22:37,966 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 11:22:37,966 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 11:22:37,967 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 11:22:37,967 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:22:37,967 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 11:22:37,967 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 11:22:37,967 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 [2020-07-21 11:22:38,277 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 11:22:38,288 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 11:22:38,292 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 11:22:38,293 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 11:22:38,293 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 11:22:38,294 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/ldv-regression/test_while_int.i [2020-07-21 11:22:38,368 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2fd7a1a5c/b679b8d4187147498e2bc012d3e9e94e/FLAG1a27c9c26 [2020-07-21 11:22:38,794 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 11:22:38,794 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/ldv-regression/test_while_int.i [2020-07-21 11:22:38,801 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2fd7a1a5c/b679b8d4187147498e2bc012d3e9e94e/FLAG1a27c9c26 [2020-07-21 11:22:39,188 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2fd7a1a5c/b679b8d4187147498e2bc012d3e9e94e [2020-07-21 11:22:39,199 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 11:22:39,202 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 11:22:39,203 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 11:22:39,203 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 11:22:39,206 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 11:22:39,207 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 11:22:39" (1/1) ... [2020-07-21 11:22:39,210 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1060d3cc and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:22:39, skipping insertion in model container [2020-07-21 11:22:39,210 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 11:22:39" (1/1) ... [2020-07-21 11:22:39,218 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 11:22:39,234 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 11:22:39,403 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 11:22:39,407 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 11:22:39,420 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 11:22:39,431 INFO L208 MainTranslator]: Completed translation [2020-07-21 11:22:39,431 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:22:39 WrapperNode [2020-07-21 11:22:39,432 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 11:22:39,432 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 11:22:39,432 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 11:22:39,432 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 11:22:39,442 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:22:39" (1/1) ... [2020-07-21 11:22:39,442 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:22:39" (1/1) ... [2020-07-21 11:22:39,446 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:22:39" (1/1) ... [2020-07-21 11:22:39,446 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:22:39" (1/1) ... [2020-07-21 11:22:39,449 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:22:39" (1/1) ... [2020-07-21 11:22:39,454 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:22:39" (1/1) ... [2020-07-21 11:22:39,454 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:22:39" (1/1) ... [2020-07-21 11:22:39,533 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 11:22:39,537 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 11:22:39,537 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 11:22:39,537 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 11:22:39,538 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:22:39" (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 [2020-07-21 11:22:39,599 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 11:22:39,599 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 11:22:39,599 INFO L138 BoogieDeclarations]: Found implementation of procedure __blast_assert [2020-07-21 11:22:39,599 INFO L138 BoogieDeclarations]: Found implementation of procedure check_error [2020-07-21 11:22:39,599 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 11:22:39,599 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 11:22:39,599 INFO L130 BoogieDeclarations]: Found specification of procedure __blast_assert [2020-07-21 11:22:39,599 INFO L130 BoogieDeclarations]: Found specification of procedure check_error [2020-07-21 11:22:39,600 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 11:22:39,600 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 11:22:39,600 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 11:22:39,761 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 11:22:39,761 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-07-21 11:22:39,765 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 11:22:39 BoogieIcfgContainer [2020-07-21 11:22:39,765 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 11:22:39,766 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 11:22:39,766 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 11:22:39,769 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 11:22:39,769 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 11:22:39" (1/3) ... [2020-07-21 11:22:39,770 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@69edf604 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 11:22:39, skipping insertion in model container [2020-07-21 11:22:39,770 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:22:39" (2/3) ... [2020-07-21 11:22:39,770 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@69edf604 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 11:22:39, skipping insertion in model container [2020-07-21 11:22:39,771 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 11:22:39" (3/3) ... [2020-07-21 11:22:39,772 INFO L109 eAbstractionObserver]: Analyzing ICFG test_while_int.i [2020-07-21 11:22:39,782 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 11:22:39,789 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 11:22:39,801 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 11:22:39,825 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 11:22:39,825 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 11:22:39,826 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 11:22:39,826 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 11:22:39,826 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 11:22:39,826 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 11:22:39,826 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 11:22:39,826 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 11:22:39,845 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states. [2020-07-21 11:22:39,851 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2020-07-21 11:22:39,851 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:22:39,852 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:22:39,853 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__blast_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:22:39,859 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:22:39,859 INFO L82 PathProgramCache]: Analyzing trace with hash 708560652, now seen corresponding path program 1 times [2020-07-21 11:22:39,868 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:22:39,868 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [941774791] [2020-07-21 11:22:39,869 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-21 11:22:39,917 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:22:39,920 INFO L263 TraceCheckSpWp]: Trace formula consists of 27 conjuncts, 5 conjunts are in the unsatisfiable core [2020-07-21 11:22:39,926 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:22:40,059 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 11:22:40,095 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 11:22:40,095 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 11:22:40,096 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [941774791] [2020-07-21 11:22:40,097 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 11:22:40,097 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-07-21 11:22:40,098 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1632634874] [2020-07-21 11:22:40,103 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-07-21 11:22:40,103 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:22:40,116 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-07-21 11:22:40,117 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2020-07-21 11:22:40,120 INFO L87 Difference]: Start difference. First operand 21 states. Second operand 6 states. [2020-07-21 11:22:40,206 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:22:40,207 INFO L93 Difference]: Finished difference Result 42 states and 54 transitions. [2020-07-21 11:22:40,208 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-21 11:22:40,209 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 11 [2020-07-21 11:22:40,209 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:22:40,220 INFO L225 Difference]: With dead ends: 42 [2020-07-21 11:22:40,220 INFO L226 Difference]: Without dead ends: 21 [2020-07-21 11:22:40,229 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2020-07-21 11:22:40,250 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-07-21 11:22:40,275 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 20. [2020-07-21 11:22:40,278 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-07-21 11:22:40,280 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 20 transitions. [2020-07-21 11:22:40,283 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 20 transitions. Word has length 11 [2020-07-21 11:22:40,283 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:22:40,284 INFO L479 AbstractCegarLoop]: Abstraction has 20 states and 20 transitions. [2020-07-21 11:22:40,284 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-07-21 11:22:40,284 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 20 transitions. [2020-07-21 11:22:40,287 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-07-21 11:22:40,287 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:22:40,288 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:22:40,501 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:22:40,501 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__blast_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:22:40,501 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:22:40,502 INFO L82 PathProgramCache]: Analyzing trace with hash 1910985178, now seen corresponding path program 1 times [2020-07-21 11:22:40,502 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:22:40,503 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1938626351] [2020-07-21 11:22:40,503 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 [2020-07-21 11:22:40,540 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:22:40,542 INFO L263 TraceCheckSpWp]: Trace formula consists of 39 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 11:22:40,544 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:22:40,571 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 11:22:40,595 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 11:22:40,596 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:22:40,621 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 11:22:40,661 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 11:22:40,662 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1938626351] [2020-07-21 11:22:40,662 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:22:40,663 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 8 [2020-07-21 11:22:40,663 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [234276009] [2020-07-21 11:22:40,665 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-07-21 11:22:40,665 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:22:40,665 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-07-21 11:22:40,666 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2020-07-21 11:22:40,666 INFO L87 Difference]: Start difference. First operand 20 states and 20 transitions. Second operand 8 states. [2020-07-21 11:22:40,727 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:22:40,728 INFO L93 Difference]: Finished difference Result 30 states and 30 transitions. [2020-07-21 11:22:40,728 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-21 11:22:40,729 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 17 [2020-07-21 11:22:40,729 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:22:40,730 INFO L225 Difference]: With dead ends: 30 [2020-07-21 11:22:40,730 INFO L226 Difference]: Without dead ends: 27 [2020-07-21 11:22:40,732 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 23 SyntacticMatches, 4 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2020-07-21 11:22:40,732 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2020-07-21 11:22:40,737 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 26. [2020-07-21 11:22:40,738 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-07-21 11:22:40,739 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 26 transitions. [2020-07-21 11:22:40,739 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 26 transitions. Word has length 17 [2020-07-21 11:22:40,739 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:22:40,739 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 26 transitions. [2020-07-21 11:22:40,739 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-07-21 11:22:40,740 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 26 transitions. [2020-07-21 11:22:40,740 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-07-21 11:22:40,741 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:22:40,741 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:22:40,941 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:22:40,942 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__blast_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:22:40,942 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:22:40,942 INFO L82 PathProgramCache]: Analyzing trace with hash -1165555160, now seen corresponding path program 2 times [2020-07-21 11:22:40,943 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:22:40,943 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1355380815] [2020-07-21 11:22:40,943 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 [2020-07-21 11:22:40,969 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-07-21 11:22:40,969 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-21 11:22:40,979 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-07-21 11:22:40,979 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-21 11:22:41,004 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-07-21 11:22:41,004 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-07-21 11:22:41,223 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:22:41,245 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.07 11:22:41 BoogieIcfgContainer [2020-07-21 11:22:41,245 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-21 11:22:41,248 INFO L168 Benchmark]: Toolchain (without parser) took 2046.98 ms. Allocated memory was 139.5 MB in the beginning and 202.4 MB in the end (delta: 62.9 MB). Free memory was 103.3 MB in the beginning and 111.9 MB in the end (delta: -8.6 MB). Peak memory consumption was 54.3 MB. Max. memory is 7.1 GB. [2020-07-21 11:22:41,249 INFO L168 Benchmark]: CDTParser took 0.17 ms. Allocated memory is still 139.5 MB. Free memory is still 120.9 MB. There was no memory consumed. Max. memory is 7.1 GB. [2020-07-21 11:22:41,249 INFO L168 Benchmark]: CACSL2BoogieTranslator took 229.04 ms. Allocated memory is still 139.5 MB. Free memory was 102.9 MB in the beginning and 93.2 MB in the end (delta: 9.7 MB). Peak memory consumption was 9.7 MB. Max. memory is 7.1 GB. [2020-07-21 11:22:41,251 INFO L168 Benchmark]: Boogie Preprocessor took 104.22 ms. Allocated memory was 139.5 MB in the beginning and 202.4 MB in the end (delta: 62.9 MB). Free memory was 93.2 MB in the beginning and 181.3 MB in the end (delta: -88.1 MB). Peak memory consumption was 14.9 MB. Max. memory is 7.1 GB. [2020-07-21 11:22:41,251 INFO L168 Benchmark]: RCFGBuilder took 228.32 ms. Allocated memory is still 202.4 MB. Free memory was 181.3 MB in the beginning and 170.3 MB in the end (delta: 11.0 MB). Peak memory consumption was 11.0 MB. Max. memory is 7.1 GB. [2020-07-21 11:22:41,252 INFO L168 Benchmark]: TraceAbstraction took 1479.44 ms. Allocated memory is still 202.4 MB. Free memory was 170.3 MB in the beginning and 111.9 MB in the end (delta: 58.4 MB). Peak memory consumption was 58.4 MB. Max. memory is 7.1 GB. [2020-07-21 11:22:41,256 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.17 ms. Allocated memory is still 139.5 MB. Free memory is still 120.9 MB. There was no memory consumed. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 229.04 ms. Allocated memory is still 139.5 MB. Free memory was 102.9 MB in the beginning and 93.2 MB in the end (delta: 9.7 MB). Peak memory consumption was 9.7 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 104.22 ms. Allocated memory was 139.5 MB in the beginning and 202.4 MB in the end (delta: 62.9 MB). Free memory was 93.2 MB in the beginning and 181.3 MB in the end (delta: -88.1 MB). Peak memory consumption was 14.9 MB. Max. memory is 7.1 GB. * RCFGBuilder took 228.32 ms. Allocated memory is still 202.4 MB. Free memory was 181.3 MB in the beginning and 170.3 MB in the end (delta: 11.0 MB). Peak memory consumption was 11.0 MB. Max. memory is 7.1 GB. * TraceAbstraction took 1479.44 ms. Allocated memory is still 202.4 MB. Free memory was 170.3 MB in the beginning and 111.9 MB in the end (delta: 58.4 MB). Peak memory consumption was 58.4 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 6]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L23] int i=0; VAL [i=0] [L24] COND TRUE i<5 [L25] i++ VAL [i=1] [L29] CALL check_error(i!=3) VAL [\old(b)=1] [L18] (b) ? (0) : __blast_assert () VAL [\old(b)=1, b=1] [L29] RET check_error(i!=3) VAL [i=1] [L24] COND TRUE i<5 [L25] i++ VAL [i=2] [L29] CALL check_error(i!=3) VAL [\old(b)=1] [L18] (b) ? (0) : __blast_assert () VAL [\old(b)=1, b=1] [L29] RET check_error(i!=3) VAL [i=2] [L24] COND TRUE i<5 [L25] i++ VAL [i=3] [L29] CALL check_error(i!=3) VAL [\old(b)=0] [L18] (b) ? (0) : __blast_assert () VAL [\old(b)=0, b=0] [L18] CALL __blast_assert () [L6] __VERIFIER_error() - StatisticsResult: Ultimate Automizer benchmark data CFG has 5 procedures, 21 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 1.4s, OverallIterations: 3, TraceHistogramMax: 3, AutomataDifference: 0.1s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 27 SDtfs, 10 SDslu, 90 SDs, 0 SdLazy, 46 SolverSat, 9 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.0s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 45 GetRequests, 29 SyntacticMatches, 4 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.1s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=26occurred 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, 2 StatesRemovedByMinimization, 2 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.0s SatisfiabilityAnalysisTime, 0.2s InterpolantComputationTime, 51 NumberOfCodeBlocks, 51 NumberOfCodeBlocksAsserted, 3 NumberOfCheckSat, 42 ConstructedInterpolants, 0 QuantifiedInterpolants, 1092 SizeOfPredicates, 4 NumberOfNonLiveVariables, 66 ConjunctsInSsa, 11 ConjunctsInUnsatCore, 3 InterpolantComputations, 1 PerfectInterpolantSequences, 4/8 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! Received shutdown request...