java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/ai/svcomp-Reach-32bit-Automizer_Default+AIv2_INT.epf -i ../../../trunk/examples/svcomp/loop-acceleration/underapprox_1-1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.24-0883e75 [2019-09-05 13:00:16,742 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-09-05 13:00:16,744 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-09-05 13:00:16,755 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2019-09-05 13:00:16,794 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/ai/svcomp-Reach-32bit-Automizer_Default+AIv2_INT.epf [2019-09-05 13:00:16,817 INFO L113 SettingsManager]: Loading preferences was successful [2019-09-05 13:00:16,818 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-09-05 13:00:16,819 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2019-09-05 13:00:16,819 INFO L138 SettingsManager]: * Log level for plugins=info [2019-09-05 13:00:16,819 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2019-09-05 13:00:16,820 INFO L138 SettingsManager]: * User list type=DISABLED [2019-09-05 13:00:16,820 INFO L138 SettingsManager]: * Ignore calls to and inside polymorphic procedures=false [2019-09-05 13:00:16,820 INFO L138 SettingsManager]: * Ignore calls to recursive procedures=false [2019-09-05 13:00:16,820 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2019-09-05 13:00:16,820 INFO L138 SettingsManager]: * Abstract domain=IntervalDomain [2019-09-05 13:00:16,822 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-09-05 13:00:16,823 INFO L138 SettingsManager]: * sizeof long=4 [2019-09-05 13:00:16,823 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-09-05 13:00:16,823 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-09-05 13:00:16,823 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-09-05 13:00:16,824 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-09-05 13:00:16,824 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-09-05 13:00:16,824 INFO L138 SettingsManager]: * sizeof long double=12 [2019-09-05 13:00:16,824 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-09-05 13:00:16,825 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-09-05 13:00:16,825 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-09-05 13:00:16,825 INFO L138 SettingsManager]: * Remove goto edges from RCFG=true [2019-09-05 13:00:16,825 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-09-05 13:00:16,825 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-09-05 13:00:16,826 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-09-05 13:00:16,826 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-09-05 13:00:16,826 INFO L138 SettingsManager]: * Trace refinement strategy=TAIPAN [2019-09-05 13:00:16,826 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-09-05 13:00:16,826 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-09-05 13:00:16,827 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2019-09-05 13:00:16,876 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-09-05 13:00:16,891 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-09-05 13:00:16,894 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-09-05 13:00:16,896 INFO L271 PluginConnector]: Initializing CDTParser... [2019-09-05 13:00:16,897 INFO L275 PluginConnector]: CDTParser initialized [2019-09-05 13:00:16,898 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/underapprox_1-1.c [2019-09-05 13:00:16,965 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ba84142de/31322d1d6925485ea83096ac86e346b1/FLAG6d87e8f22 [2019-09-05 13:00:17,353 INFO L306 CDTParser]: Found 1 translation units. [2019-09-05 13:00:17,354 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/underapprox_1-1.c [2019-09-05 13:00:17,360 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ba84142de/31322d1d6925485ea83096ac86e346b1/FLAG6d87e8f22 [2019-09-05 13:00:17,711 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ba84142de/31322d1d6925485ea83096ac86e346b1 [2019-09-05 13:00:17,720 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-09-05 13:00:17,722 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-09-05 13:00:17,723 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-09-05 13:00:17,723 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-09-05 13:00:17,726 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-09-05 13:00:17,727 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 05.09 01:00:17" (1/1) ... [2019-09-05 13:00:17,730 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5488fcf0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.09 01:00:17, skipping insertion in model container [2019-09-05 13:00:17,730 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 05.09 01:00:17" (1/1) ... [2019-09-05 13:00:17,737 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-09-05 13:00:17,753 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-09-05 13:00:17,888 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-09-05 13:00:17,892 INFO L188 MainTranslator]: Completed pre-run [2019-09-05 13:00:17,908 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-09-05 13:00:17,922 INFO L192 MainTranslator]: Completed translation [2019-09-05 13:00:17,923 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.09 01:00:17 WrapperNode [2019-09-05 13:00:17,923 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-09-05 13:00:17,924 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-09-05 13:00:17,924 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-09-05 13:00:17,924 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-09-05 13:00:17,937 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.09 01:00:17" (1/1) ... [2019-09-05 13:00:17,938 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.09 01:00:17" (1/1) ... [2019-09-05 13:00:18,030 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.09 01:00:17" (1/1) ... [2019-09-05 13:00:18,030 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.09 01:00:17" (1/1) ... [2019-09-05 13:00:18,033 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.09 01:00:17" (1/1) ... [2019-09-05 13:00:18,038 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.09 01:00:17" (1/1) ... [2019-09-05 13:00:18,039 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.09 01:00:17" (1/1) ... [2019-09-05 13:00:18,040 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-09-05 13:00:18,041 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-09-05 13:00:18,041 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-09-05 13:00:18,041 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-09-05 13:00:18,042 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.09 01:00:17" (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 [2019-09-05 13:00:18,104 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-09-05 13:00:18,104 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-09-05 13:00:18,104 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-09-05 13:00:18,104 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-09-05 13:00:18,105 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-09-05 13:00:18,105 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-09-05 13:00:18,105 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-09-05 13:00:18,105 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-09-05 13:00:18,105 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-09-05 13:00:18,260 INFO L278 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-09-05 13:00:18,260 INFO L283 CfgBuilder]: Removed 1 assume(true) statements. [2019-09-05 13:00:18,262 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 05.09 01:00:18 BoogieIcfgContainer [2019-09-05 13:00:18,262 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-09-05 13:00:18,263 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-09-05 13:00:18,263 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-09-05 13:00:18,266 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-09-05 13:00:18,266 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 05.09 01:00:17" (1/3) ... [2019-09-05 13:00:18,267 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@b15dbd6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 05.09 01:00:18, skipping insertion in model container [2019-09-05 13:00:18,267 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.09 01:00:17" (2/3) ... [2019-09-05 13:00:18,267 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@b15dbd6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 05.09 01:00:18, skipping insertion in model container [2019-09-05 13:00:18,267 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 05.09 01:00:18" (3/3) ... [2019-09-05 13:00:18,269 INFO L109 eAbstractionObserver]: Analyzing ICFG underapprox_1-1.c [2019-09-05 13:00:18,278 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-09-05 13:00:18,286 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-09-05 13:00:18,309 INFO L252 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-09-05 13:00:18,339 INFO L377 AbstractCegarLoop]: Interprodecural is true [2019-09-05 13:00:18,339 INFO L378 AbstractCegarLoop]: Hoare is false [2019-09-05 13:00:18,339 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-09-05 13:00:18,339 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-09-05 13:00:18,339 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-09-05 13:00:18,339 INFO L382 AbstractCegarLoop]: Difference is false [2019-09-05 13:00:18,340 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-09-05 13:00:18,340 INFO L388 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-09-05 13:00:18,352 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states. [2019-09-05 13:00:18,360 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2019-09-05 13:00:18,360 INFO L391 BasicCegarLoop]: Found error trace [2019-09-05 13:00:18,361 INFO L399 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-05 13:00:18,363 INFO L418 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-05 13:00:18,367 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-05 13:00:18,367 INFO L82 PathProgramCache]: Analyzing trace with hash 1846144830, now seen corresponding path program 1 times [2019-09-05 13:00:18,369 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-05 13:00:18,405 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 13:00:18,406 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-05 13:00:18,406 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 13:00:18,406 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-05 13:00:18,444 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 13:00:18,590 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-05 13:00:18,593 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-09-05 13:00:18,593 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2019-09-05 13:00:18,593 INFO L257 anRefinementStrategy]: Using the first perfect interpolant sequence [2019-09-05 13:00:18,598 INFO L454 AbstractCegarLoop]: Interpolant automaton has 5 states [2019-09-05 13:00:18,614 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2019-09-05 13:00:18,615 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2019-09-05 13:00:18,617 INFO L87 Difference]: Start difference. First operand 17 states. Second operand 5 states. [2019-09-05 13:00:18,697 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-05 13:00:18,697 INFO L93 Difference]: Finished difference Result 25 states and 26 transitions. [2019-09-05 13:00:18,698 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-09-05 13:00:18,699 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 10 [2019-09-05 13:00:18,699 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-05 13:00:18,706 INFO L225 Difference]: With dead ends: 25 [2019-09-05 13:00:18,707 INFO L226 Difference]: Without dead ends: 12 [2019-09-05 13:00:18,708 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2019-09-05 13:00:18,724 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2019-09-05 13:00:18,736 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2019-09-05 13:00:18,737 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2019-09-05 13:00:18,737 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 12 transitions. [2019-09-05 13:00:18,738 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 12 transitions. Word has length 10 [2019-09-05 13:00:18,738 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-05 13:00:18,738 INFO L475 AbstractCegarLoop]: Abstraction has 12 states and 12 transitions. [2019-09-05 13:00:18,739 INFO L476 AbstractCegarLoop]: Interpolant automaton has 5 states. [2019-09-05 13:00:18,739 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 12 transitions. [2019-09-05 13:00:18,739 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2019-09-05 13:00:18,739 INFO L391 BasicCegarLoop]: Found error trace [2019-09-05 13:00:18,740 INFO L399 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-05 13:00:18,740 INFO L418 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-05 13:00:18,740 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-05 13:00:18,741 INFO L82 PathProgramCache]: Analyzing trace with hash 1432376145, now seen corresponding path program 1 times [2019-09-05 13:00:18,741 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-05 13:00:18,742 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 13:00:18,742 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-05 13:00:18,742 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 13:00:18,742 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-05 13:00:18,752 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 13:00:18,874 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-05 13:00:18,875 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 13:00:18,875 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-05 13:00:18,878 INFO L205 CegarAbsIntRunner]: Running AI on error trace of length 12 with the following transitions: [2019-09-05 13:00:18,880 INFO L207 CegarAbsIntRunner]: [0], [4], [11], [13], [19], [22], [24], [30], [31], [32], [34] [2019-09-05 13:00:18,912 INFO L148 AbstractInterpreter]: Using domain IntervalDomain [2019-09-05 13:00:18,912 INFO L101 FixpointEngine]: Starting fixpoint engine with domain IntervalDomain (maxUnwinding=3, maxParallelStates=2) [2019-09-05 13:00:18,970 WARN L79 EvaluatorLogger]: Possible loss of precision. Operator ARITHMOD has no precise implementation. [2019-09-05 13:00:19,034 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2019-09-05 13:00:19,037 INFO L272 AbstractInterpreter]: Visited 11 different actions 47 times. Merged at 2 different actions 12 times. Widened at 1 different actions 4 times. Performed 89 root evaluator evaluations with a maximum evaluation depth of 6. Performed 89 inverse root evaluator evaluations with a maximum inverse evaluation depth of 6. Found 1 fixpoints after 1 different actions. Largest state had 3 variables. [2019-09-05 13:00:19,040 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-05 13:00:19,041 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-09-05 13:00:19,041 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 13:00:19,041 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-05 13:00:19,059 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-05 13:00:19,059 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-09-05 13:00:19,091 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 13:00:19,093 INFO L256 TraceCheckSpWp]: Trace formula consists of 29 conjuncts, 5 conjunts are in the unsatisfiable core [2019-09-05 13:00:19,100 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-05 13:00:19,147 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-05 13:00:19,147 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-05 13:00:19,190 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-05 13:00:19,195 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-09-05 13:00:19,195 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 4, 4] total 10 [2019-09-05 13:00:19,195 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-05 13:00:19,196 INFO L454 AbstractCegarLoop]: Interpolant automaton has 8 states [2019-09-05 13:00:19,196 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2019-09-05 13:00:19,197 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2019-09-05 13:00:19,197 INFO L87 Difference]: Start difference. First operand 12 states and 12 transitions. Second operand 8 states. [2019-09-05 13:00:19,261 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-05 13:00:19,261 INFO L93 Difference]: Finished difference Result 13 states and 13 transitions. [2019-09-05 13:00:19,262 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-09-05 13:00:19,263 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 11 [2019-09-05 13:00:19,263 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-05 13:00:19,263 INFO L225 Difference]: With dead ends: 13 [2019-09-05 13:00:19,264 INFO L226 Difference]: Without dead ends: 13 [2019-09-05 13:00:19,265 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=35, Invalid=97, Unknown=0, NotChecked=0, Total=132 [2019-09-05 13:00:19,265 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2019-09-05 13:00:19,268 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2019-09-05 13:00:19,268 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2019-09-05 13:00:19,269 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 13 transitions. [2019-09-05 13:00:19,269 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 13 transitions. Word has length 11 [2019-09-05 13:00:19,271 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-05 13:00:19,271 INFO L475 AbstractCegarLoop]: Abstraction has 13 states and 13 transitions. [2019-09-05 13:00:19,271 INFO L476 AbstractCegarLoop]: Interpolant automaton has 8 states. [2019-09-05 13:00:19,271 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 13 transitions. [2019-09-05 13:00:19,272 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2019-09-05 13:00:19,272 INFO L391 BasicCegarLoop]: Found error trace [2019-09-05 13:00:19,272 INFO L399 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-05 13:00:19,272 INFO L418 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-05 13:00:19,273 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-05 13:00:19,273 INFO L82 PathProgramCache]: Analyzing trace with hash 1490448798, now seen corresponding path program 2 times [2019-09-05 13:00:19,274 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-05 13:00:19,277 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 13:00:19,278 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-05 13:00:19,278 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 13:00:19,279 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-05 13:00:19,302 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 13:00:19,428 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-05 13:00:19,428 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 13:00:19,429 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-05 13:00:19,429 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-09-05 13:00:19,429 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-09-05 13:00:19,429 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 13:00:19,429 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) [2019-09-05 13:00:19,450 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-09-05 13:00:19,450 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-05 13:00:19,467 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2019-09-05 13:00:19,468 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-05 13:00:19,469 INFO L256 TraceCheckSpWp]: Trace formula consists of 34 conjuncts, 7 conjunts are in the unsatisfiable core [2019-09-05 13:00:19,471 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-05 13:00:19,512 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-05 13:00:19,512 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-05 13:00:19,588 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [MP z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (3)] Exception during sending of exit command (exit): Broken pipe [2019-09-05 13:00:19,594 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-09-05 13:00:19,594 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 5, 5] total 13 [2019-09-05 13:00:19,595 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-05 13:00:19,596 INFO L454 AbstractCegarLoop]: Interpolant automaton has 10 states [2019-09-05 13:00:19,596 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2019-09-05 13:00:19,596 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=122, Unknown=0, NotChecked=0, Total=156 [2019-09-05 13:00:19,597 INFO L87 Difference]: Start difference. First operand 13 states and 13 transitions. Second operand 10 states. [2019-09-05 13:00:19,712 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-05 13:00:19,713 INFO L93 Difference]: Finished difference Result 14 states and 14 transitions. [2019-09-05 13:00:19,713 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-09-05 13:00:19,713 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 12 [2019-09-05 13:00:19,713 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-05 13:00:19,714 INFO L225 Difference]: With dead ends: 14 [2019-09-05 13:00:19,714 INFO L226 Difference]: Without dead ends: 14 [2019-09-05 13:00:19,714 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=57, Invalid=183, Unknown=0, NotChecked=0, Total=240 [2019-09-05 13:00:19,715 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2019-09-05 13:00:19,716 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2019-09-05 13:00:19,717 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2019-09-05 13:00:19,717 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2019-09-05 13:00:19,717 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 12 [2019-09-05 13:00:19,718 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-05 13:00:19,718 INFO L475 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2019-09-05 13:00:19,718 INFO L476 AbstractCegarLoop]: Interpolant automaton has 10 states. [2019-09-05 13:00:19,718 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2019-09-05 13:00:19,718 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2019-09-05 13:00:19,719 INFO L391 BasicCegarLoop]: Found error trace [2019-09-05 13:00:19,719 INFO L399 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-05 13:00:19,719 INFO L418 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-05 13:00:19,719 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-05 13:00:19,719 INFO L82 PathProgramCache]: Analyzing trace with hash -1004266255, now seen corresponding path program 3 times [2019-09-05 13:00:19,720 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-05 13:00:19,720 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 13:00:19,720 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-05 13:00:19,721 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 13:00:19,721 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-05 13:00:19,731 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 13:00:19,836 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-05 13:00:19,836 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 13:00:19,837 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-05 13:00:19,837 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-09-05 13:00:19,837 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-09-05 13:00:19,837 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 13:00:19,837 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) [2019-09-05 13:00:19,858 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-09-05 13:00:19,859 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-05 13:00:19,870 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-09-05 13:00:19,870 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-05 13:00:19,871 INFO L256 TraceCheckSpWp]: Trace formula consists of 39 conjuncts, 9 conjunts are in the unsatisfiable core [2019-09-05 13:00:19,872 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-05 13:00:19,918 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-05 13:00:19,918 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-05 13:00:20,012 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-05 13:00:20,016 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-09-05 13:00:20,016 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 6, 6] total 16 [2019-09-05 13:00:20,016 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-05 13:00:20,017 INFO L454 AbstractCegarLoop]: Interpolant automaton has 12 states [2019-09-05 13:00:20,017 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2019-09-05 13:00:20,018 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=193, Unknown=0, NotChecked=0, Total=240 [2019-09-05 13:00:20,018 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand 12 states. [2019-09-05 13:00:20,134 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-05 13:00:20,135 INFO L93 Difference]: Finished difference Result 15 states and 15 transitions. [2019-09-05 13:00:20,135 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-09-05 13:00:20,136 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 13 [2019-09-05 13:00:20,136 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-05 13:00:20,137 INFO L225 Difference]: With dead ends: 15 [2019-09-05 13:00:20,137 INFO L226 Difference]: Without dead ends: 15 [2019-09-05 13:00:20,138 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=81, Invalid=299, Unknown=0, NotChecked=0, Total=380 [2019-09-05 13:00:20,138 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2019-09-05 13:00:20,141 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2019-09-05 13:00:20,141 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2019-09-05 13:00:20,142 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2019-09-05 13:00:20,142 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 13 [2019-09-05 13:00:20,144 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-05 13:00:20,144 INFO L475 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2019-09-05 13:00:20,144 INFO L476 AbstractCegarLoop]: Interpolant automaton has 12 states. [2019-09-05 13:00:20,144 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2019-09-05 13:00:20,145 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2019-09-05 13:00:20,145 INFO L391 BasicCegarLoop]: Found error trace [2019-09-05 13:00:20,145 INFO L399 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-05 13:00:20,146 INFO L418 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-05 13:00:20,146 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-05 13:00:20,146 INFO L82 PathProgramCache]: Analyzing trace with hash -1031021570, now seen corresponding path program 4 times [2019-09-05 13:00:20,146 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-05 13:00:20,148 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 13:00:20,148 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-05 13:00:20,148 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 13:00:20,148 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-05 13:00:20,180 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 13:00:20,297 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-05 13:00:20,297 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 13:00:20,297 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-05 13:00:20,297 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-09-05 13:00:20,298 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-09-05 13:00:20,298 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 13:00:20,298 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) [2019-09-05 13:00:20,313 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-05 13:00:20,314 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-05 13:00:20,330 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 13:00:20,331 INFO L256 TraceCheckSpWp]: Trace formula consists of 44 conjuncts, 11 conjunts are in the unsatisfiable core [2019-09-05 13:00:20,333 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-05 13:00:20,407 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-05 13:00:20,408 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-05 13:00:20,530 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-05 13:00:20,534 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-09-05 13:00:20,534 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 7, 7] total 19 [2019-09-05 13:00:20,534 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-05 13:00:20,535 INFO L454 AbstractCegarLoop]: Interpolant automaton has 14 states [2019-09-05 13:00:20,536 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2019-09-05 13:00:20,536 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=284, Unknown=0, NotChecked=0, Total=342 [2019-09-05 13:00:20,536 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand 14 states. [2019-09-05 13:00:20,694 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-05 13:00:20,695 INFO L93 Difference]: Finished difference Result 16 states and 16 transitions. [2019-09-05 13:00:20,695 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-09-05 13:00:20,696 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 14 [2019-09-05 13:00:20,700 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-05 13:00:20,701 INFO L225 Difference]: With dead ends: 16 [2019-09-05 13:00:20,701 INFO L226 Difference]: Without dead ends: 16 [2019-09-05 13:00:20,702 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=101, Invalid=451, Unknown=0, NotChecked=0, Total=552 [2019-09-05 13:00:20,702 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2019-09-05 13:00:20,703 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2019-09-05 13:00:20,704 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2019-09-05 13:00:20,704 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 16 transitions. [2019-09-05 13:00:20,705 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 16 transitions. Word has length 14 [2019-09-05 13:00:20,705 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-05 13:00:20,705 INFO L475 AbstractCegarLoop]: Abstraction has 16 states and 16 transitions. [2019-09-05 13:00:20,705 INFO L476 AbstractCegarLoop]: Interpolant automaton has 14 states. [2019-09-05 13:00:20,705 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 16 transitions. [2019-09-05 13:00:20,706 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2019-09-05 13:00:20,706 INFO L391 BasicCegarLoop]: Found error trace [2019-09-05 13:00:20,706 INFO L399 BasicCegarLoop]: trace histogram [5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-05 13:00:20,706 INFO L418 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-05 13:00:20,707 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-05 13:00:20,707 INFO L82 PathProgramCache]: Analyzing trace with hash -1860436335, now seen corresponding path program 5 times [2019-09-05 13:00:20,707 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-05 13:00:20,707 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 13:00:20,708 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-05 13:00:20,708 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 13:00:20,708 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-05 13:00:20,719 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 13:00:20,858 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-05 13:00:20,859 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 13:00:20,859 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-05 13:00:20,859 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-09-05 13:00:20,859 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-09-05 13:00:20,860 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 13:00:20,860 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) [2019-09-05 13:00:20,881 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-09-05 13:00:20,881 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-05 13:00:20,901 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2019-09-05 13:00:20,902 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-05 13:00:20,903 INFO L256 TraceCheckSpWp]: Trace formula consists of 49 conjuncts, 13 conjunts are in the unsatisfiable core [2019-09-05 13:00:20,904 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-05 13:00:20,993 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-05 13:00:20,993 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-05 13:00:21,136 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [MP z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (6)] Exception during sending of exit command (exit): Stream Closed [2019-09-05 13:00:21,140 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-09-05 13:00:21,140 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 8, 8] total 22 [2019-09-05 13:00:21,140 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-05 13:00:21,141 INFO L454 AbstractCegarLoop]: Interpolant automaton has 16 states [2019-09-05 13:00:21,141 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2019-09-05 13:00:21,142 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=395, Unknown=0, NotChecked=0, Total=462 [2019-09-05 13:00:21,142 INFO L87 Difference]: Start difference. First operand 16 states and 16 transitions. Second operand 16 states. [2019-09-05 13:00:21,319 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-05 13:00:21,320 INFO L93 Difference]: Finished difference Result 17 states and 17 transitions. [2019-09-05 13:00:21,320 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2019-09-05 13:00:21,320 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 15 [2019-09-05 13:00:21,320 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-05 13:00:21,321 INFO L225 Difference]: With dead ends: 17 [2019-09-05 13:00:21,321 INFO L226 Difference]: Without dead ends: 17 [2019-09-05 13:00:21,322 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=117, Invalid=639, Unknown=0, NotChecked=0, Total=756 [2019-09-05 13:00:21,322 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2019-09-05 13:00:21,324 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2019-09-05 13:00:21,324 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2019-09-05 13:00:21,324 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2019-09-05 13:00:21,325 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 15 [2019-09-05 13:00:21,325 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-05 13:00:21,325 INFO L475 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2019-09-05 13:00:21,325 INFO L476 AbstractCegarLoop]: Interpolant automaton has 16 states. [2019-09-05 13:00:21,325 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2019-09-05 13:00:21,326 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2019-09-05 13:00:21,326 INFO L391 BasicCegarLoop]: Found error trace [2019-09-05 13:00:21,326 INFO L399 BasicCegarLoop]: trace histogram [6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-05 13:00:21,326 INFO L418 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-05 13:00:21,326 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-05 13:00:21,327 INFO L82 PathProgramCache]: Analyzing trace with hash -1802490274, now seen corresponding path program 6 times [2019-09-05 13:00:21,327 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-05 13:00:21,327 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 13:00:21,328 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-05 13:00:21,328 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 13:00:21,328 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-05 13:00:21,339 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2019-09-05 13:00:21,350 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2019-09-05 13:00:21,365 INFO L466 BasicCegarLoop]: Counterexample might be feasible [2019-09-05 13:00:21,387 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 05.09 01:00:21 BoogieIcfgContainer [2019-09-05 13:00:21,387 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2019-09-05 13:00:21,389 INFO L168 Benchmark]: Toolchain (without parser) took 3666.60 ms. Allocated memory was 142.1 MB in the beginning and 253.8 MB in the end (delta: 111.7 MB). Free memory was 89.8 MB in the beginning and 153.6 MB in the end (delta: -63.9 MB). Peak memory consumption was 47.8 MB. Max. memory is 7.1 GB. [2019-09-05 13:00:21,390 INFO L168 Benchmark]: CDTParser took 0.20 ms. Allocated memory is still 142.1 MB. Free memory was 108.2 MB in the beginning and 107.9 MB in the end (delta: 212.8 kB). Peak memory consumption was 212.8 kB. Max. memory is 7.1 GB. [2019-09-05 13:00:21,391 INFO L168 Benchmark]: CACSL2BoogieTranslator took 200.77 ms. Allocated memory is still 142.1 MB. Free memory was 89.5 MB in the beginning and 80.5 MB in the end (delta: 9.0 MB). Peak memory consumption was 9.0 MB. Max. memory is 7.1 GB. [2019-09-05 13:00:21,392 INFO L168 Benchmark]: Boogie Preprocessor took 116.41 ms. Allocated memory was 142.1 MB in the beginning and 199.8 MB in the end (delta: 57.7 MB). Free memory was 80.5 MB in the beginning and 177.9 MB in the end (delta: -97.4 MB). Peak memory consumption was 11.8 MB. Max. memory is 7.1 GB. [2019-09-05 13:00:21,393 INFO L168 Benchmark]: RCFGBuilder took 221.24 ms. Allocated memory is still 199.8 MB. Free memory was 177.9 MB in the beginning and 167.4 MB in the end (delta: 10.5 MB). Peak memory consumption was 10.5 MB. Max. memory is 7.1 GB. [2019-09-05 13:00:21,394 INFO L168 Benchmark]: TraceAbstraction took 3124.23 ms. Allocated memory was 199.8 MB in the beginning and 253.8 MB in the end (delta: 54.0 MB). Free memory was 167.4 MB in the beginning and 153.6 MB in the end (delta: 13.8 MB). Peak memory consumption was 67.8 MB. Max. memory is 7.1 GB. [2019-09-05 13:00:21,397 INFO L335 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.20 ms. Allocated memory is still 142.1 MB. Free memory was 108.2 MB in the beginning and 107.9 MB in the end (delta: 212.8 kB). Peak memory consumption was 212.8 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 200.77 ms. Allocated memory is still 142.1 MB. Free memory was 89.5 MB in the beginning and 80.5 MB in the end (delta: 9.0 MB). Peak memory consumption was 9.0 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 116.41 ms. Allocated memory was 142.1 MB in the beginning and 199.8 MB in the end (delta: 57.7 MB). Free memory was 80.5 MB in the beginning and 177.9 MB in the end (delta: -97.4 MB). Peak memory consumption was 11.8 MB. Max. memory is 7.1 GB. * RCFGBuilder took 221.24 ms. Allocated memory is still 199.8 MB. Free memory was 177.9 MB in the beginning and 167.4 MB in the end (delta: 10.5 MB). Peak memory consumption was 10.5 MB. Max. memory is 7.1 GB. * TraceAbstraction took 3124.23 ms. Allocated memory was 199.8 MB in the beginning and 253.8 MB in the end (delta: 54.0 MB). Free memory was 167.4 MB in the beginning and 153.6 MB in the end (delta: 13.8 MB). Peak memory consumption was 67.8 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 5]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L11] unsigned int x = 0; [L12] unsigned int y = 1; VAL [x=0, y=1] [L14] COND TRUE x < 6 [L15] x++ [L16] y *= 2 VAL [x=1, y=2] [L14] COND TRUE x < 6 [L15] x++ [L16] y *= 2 VAL [x=2, y=4] [L14] COND TRUE x < 6 [L15] x++ [L16] y *= 2 VAL [x=3, y=8] [L14] COND TRUE x < 6 [L15] x++ [L16] y *= 2 VAL [x=4, y=16] [L14] COND TRUE x < 6 [L15] x++ [L16] y *= 2 VAL [x=5, y=32] [L14] COND TRUE x < 6 [L15] x++ [L16] y *= 2 VAL [x=6, y=64] [L14] COND FALSE !(x < 6) VAL [x=6, y=64] [L19] CALL __VERIFIER_assert(y != 64) VAL [\old(cond)=0] [L4] COND TRUE !(cond) VAL [\old(cond)=0, cond=0] [L5] __VERIFIER_error() VAL [\old(cond)=0, cond=0] - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 17 locations, 1 error locations. UNSAFE Result, 3.0s OverallTime, 7 OverallIterations, 6 TraceHistogramMax, 0.7s AutomataDifference, 0.0s DeadEndRemovalTime, 0.0s HoareAnnotationTime, HoareTripleCheckerStatistics: 64 SDtfs, 7 SDslu, 414 SDs, 0 SdLazy, 275 SolverSat, 16 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.2s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 191 GetRequests, 97 SyntacticMatches, 0 SemanticMatches, 94 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 112 ImplicationChecksByTransitivity, 1.5s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=17occurred in iteration=0, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.1s AbstIntTime, 1 AbstIntIterations, 0 AbstIntStrong, NaN AbsIntWeakeningRatio, NaN AbsIntAvgWeakeningVarsNumRemoved, NaN AbsIntAvgWeakenedConjuncts, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 6 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TraceCheckStatistics: 0.0s SsaConstructionTime, 0.1s SatisfiabilityAnalysisTime, 1.5s InterpolantComputationTime, 156 NumberOfCodeBlocks, 156 NumberOfCodeBlocksAsserted, 17 NumberOfCheckSat, 189 ConstructedInterpolants, 0 QuantifiedInterpolants, 7085 SizeOfPredicates, 5 NumberOfNonLiveVariables, 195 ConjunctsInSsa, 45 ConjunctsInUnsatCore, 16 InterpolantComputations, 1 PerfectInterpolantSequences, 0/105 InterpolantCoveringCapability, InvariantSynthesisStatistics: No data available, InterpolantConsolidationStatistics: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! Received shutdown request...