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/loops/sum01_bug02.i -------------------------------------------------------------------------------- This is Ultimate 0.1.24-fea9116 [2019-09-20 13:25:08,651 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-09-20 13:25:08,653 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-09-20 13:25:08,666 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-09-20 13:25:08,666 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-09-20 13:25:08,667 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-09-20 13:25:08,669 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-09-20 13:25:08,671 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-09-20 13:25:08,672 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-09-20 13:25:08,673 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-09-20 13:25:08,674 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-09-20 13:25:08,676 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-09-20 13:25:08,676 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-09-20 13:25:08,677 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-09-20 13:25:08,678 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-09-20 13:25:08,679 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-09-20 13:25:08,680 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-09-20 13:25:08,683 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-09-20 13:25:08,685 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-09-20 13:25:08,689 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-09-20 13:25:08,691 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-09-20 13:25:08,692 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-09-20 13:25:08,696 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-09-20 13:25:08,697 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-09-20 13:25:08,699 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-09-20 13:25:08,714 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-09-20 13:25:08,715 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-09-20 13:25:08,716 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-09-20 13:25:08,717 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 [2019-09-20 13:25:08,741 INFO L113 SettingsManager]: Loading preferences was successful [2019-09-20 13:25:08,742 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-09-20 13:25:08,743 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2019-09-20 13:25:08,743 INFO L138 SettingsManager]: * Log level for plugins=info [2019-09-20 13:25:08,744 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2019-09-20 13:25:08,744 INFO L138 SettingsManager]: * User list type=DISABLED [2019-09-20 13:25:08,744 INFO L138 SettingsManager]: * Ignore calls to and inside polymorphic procedures=false [2019-09-20 13:25:08,744 INFO L138 SettingsManager]: * Ignore calls to recursive procedures=false [2019-09-20 13:25:08,745 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2019-09-20 13:25:08,745 INFO L138 SettingsManager]: * Abstract domain=IntervalDomain [2019-09-20 13:25:08,747 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-09-20 13:25:08,747 INFO L138 SettingsManager]: * sizeof long=4 [2019-09-20 13:25:08,748 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-09-20 13:25:08,748 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-09-20 13:25:08,748 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-09-20 13:25:08,748 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-09-20 13:25:08,749 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-09-20 13:25:08,749 INFO L138 SettingsManager]: * sizeof long double=12 [2019-09-20 13:25:08,749 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-09-20 13:25:08,750 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-09-20 13:25:08,751 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-09-20 13:25:08,751 INFO L138 SettingsManager]: * Remove goto edges from RCFG=true [2019-09-20 13:25:08,751 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-09-20 13:25:08,751 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-09-20 13:25:08,752 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-09-20 13:25:08,752 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-09-20 13:25:08,752 INFO L138 SettingsManager]: * Trace refinement strategy=TAIPAN [2019-09-20 13:25:08,752 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-09-20 13:25:08,752 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-09-20 13:25:08,752 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2019-09-20 13:25:08,806 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-09-20 13:25:08,819 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-09-20 13:25:08,822 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-09-20 13:25:08,824 INFO L271 PluginConnector]: Initializing CDTParser... [2019-09-20 13:25:08,824 INFO L275 PluginConnector]: CDTParser initialized [2019-09-20 13:25:08,825 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops/sum01_bug02.i [2019-09-20 13:25:08,889 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2d824e4d6/ff771594c57a46d2a424d617a022f07e/FLAG8e9108ef8 [2019-09-20 13:25:09,278 INFO L306 CDTParser]: Found 1 translation units. [2019-09-20 13:25:09,278 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops/sum01_bug02.i [2019-09-20 13:25:09,285 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2d824e4d6/ff771594c57a46d2a424d617a022f07e/FLAG8e9108ef8 [2019-09-20 13:25:09,708 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2d824e4d6/ff771594c57a46d2a424d617a022f07e [2019-09-20 13:25:09,720 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-09-20 13:25:09,722 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-09-20 13:25:09,725 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-09-20 13:25:09,725 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-09-20 13:25:09,729 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-09-20 13:25:09,730 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.09 01:25:09" (1/1) ... [2019-09-20 13:25:09,733 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@237e2548 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.09 01:25:09, skipping insertion in model container [2019-09-20 13:25:09,734 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.09 01:25:09" (1/1) ... [2019-09-20 13:25:09,741 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-09-20 13:25:09,762 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-09-20 13:25:09,969 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-09-20 13:25:09,974 INFO L188 MainTranslator]: Completed pre-run [2019-09-20 13:25:09,991 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-09-20 13:25:10,006 INFO L192 MainTranslator]: Completed translation [2019-09-20 13:25:10,007 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.09 01:25:10 WrapperNode [2019-09-20 13:25:10,007 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-09-20 13:25:10,008 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-09-20 13:25:10,008 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-09-20 13:25:10,008 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-09-20 13:25:10,114 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.09 01:25:10" (1/1) ... [2019-09-20 13:25:10,116 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.09 01:25:10" (1/1) ... [2019-09-20 13:25:10,122 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.09 01:25:10" (1/1) ... [2019-09-20 13:25:10,122 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.09 01:25:10" (1/1) ... [2019-09-20 13:25:10,126 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.09 01:25:10" (1/1) ... [2019-09-20 13:25:10,132 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.09 01:25:10" (1/1) ... [2019-09-20 13:25:10,133 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.09 01:25:10" (1/1) ... [2019-09-20 13:25:10,139 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-09-20 13:25:10,140 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-09-20 13:25:10,143 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-09-20 13:25:10,143 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-09-20 13:25:10,146 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.09 01:25:10" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-09-20 13:25:10,206 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-09-20 13:25:10,206 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-09-20 13:25:10,206 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-09-20 13:25:10,206 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-09-20 13:25:10,206 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-09-20 13:25:10,207 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-09-20 13:25:10,207 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2019-09-20 13:25:10,207 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-09-20 13:25:10,207 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-09-20 13:25:10,207 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-09-20 13:25:10,380 INFO L278 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-09-20 13:25:10,381 INFO L283 CfgBuilder]: Removed 1 assume(true) statements. [2019-09-20 13:25:10,382 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.09 01:25:10 BoogieIcfgContainer [2019-09-20 13:25:10,382 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-09-20 13:25:10,383 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-09-20 13:25:10,384 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-09-20 13:25:10,387 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-09-20 13:25:10,387 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.09 01:25:09" (1/3) ... [2019-09-20 13:25:10,388 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@69fa94ad and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.09 01:25:10, skipping insertion in model container [2019-09-20 13:25:10,388 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.09 01:25:10" (2/3) ... [2019-09-20 13:25:10,389 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@69fa94ad and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.09 01:25:10, skipping insertion in model container [2019-09-20 13:25:10,389 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.09 01:25:10" (3/3) ... [2019-09-20 13:25:10,391 INFO L109 eAbstractionObserver]: Analyzing ICFG sum01_bug02.i [2019-09-20 13:25:10,400 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-09-20 13:25:10,408 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-09-20 13:25:10,426 INFO L252 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-09-20 13:25:10,466 INFO L377 AbstractCegarLoop]: Interprodecural is true [2019-09-20 13:25:10,466 INFO L378 AbstractCegarLoop]: Hoare is false [2019-09-20 13:25:10,466 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-09-20 13:25:10,466 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-09-20 13:25:10,467 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-09-20 13:25:10,467 INFO L382 AbstractCegarLoop]: Difference is false [2019-09-20 13:25:10,468 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-09-20 13:25:10,468 INFO L388 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-09-20 13:25:10,490 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states. [2019-09-20 13:25:10,503 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2019-09-20 13:25:10,503 INFO L399 BasicCegarLoop]: Found error trace [2019-09-20 13:25:10,504 INFO L407 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-20 13:25:10,507 INFO L418 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-20 13:25:10,515 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-20 13:25:10,515 INFO L82 PathProgramCache]: Analyzing trace with hash -146959038, now seen corresponding path program 1 times [2019-09-20 13:25:10,518 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-20 13:25:10,599 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 13:25:10,599 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-20 13:25:10,600 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 13:25:10,600 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-20 13:25:10,632 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-20 13:25:10,661 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-20 13:25:10,663 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-09-20 13:25:10,664 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2019-09-20 13:25:10,664 INFO L257 anRefinementStrategy]: Using the first perfect interpolant sequence [2019-09-20 13:25:10,667 INFO L454 AbstractCegarLoop]: Interpolant automaton has 2 states [2019-09-20 13:25:10,678 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2019-09-20 13:25:10,679 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2019-09-20 13:25:10,681 INFO L87 Difference]: Start difference. First operand 20 states. Second operand 2 states. [2019-09-20 13:25:10,698 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-20 13:25:10,699 INFO L93 Difference]: Finished difference Result 20 states and 21 transitions. [2019-09-20 13:25:10,699 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2019-09-20 13:25:10,701 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 10 [2019-09-20 13:25:10,701 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-20 13:25:10,711 INFO L225 Difference]: With dead ends: 20 [2019-09-20 13:25:10,711 INFO L226 Difference]: Without dead ends: 14 [2019-09-20 13:25:10,713 INFO L636 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2019-09-20 13:25:10,727 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2019-09-20 13:25:10,739 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2019-09-20 13:25:10,740 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2019-09-20 13:25:10,741 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 15 transitions. [2019-09-20 13:25:10,743 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 15 transitions. Word has length 10 [2019-09-20 13:25:10,743 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-20 13:25:10,743 INFO L475 AbstractCegarLoop]: Abstraction has 14 states and 15 transitions. [2019-09-20 13:25:10,743 INFO L476 AbstractCegarLoop]: Interpolant automaton has 2 states. [2019-09-20 13:25:10,744 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 15 transitions. [2019-09-20 13:25:10,744 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2019-09-20 13:25:10,744 INFO L399 BasicCegarLoop]: Found error trace [2019-09-20 13:25:10,744 INFO L407 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-20 13:25:10,745 INFO L418 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-20 13:25:10,745 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-20 13:25:10,746 INFO L82 PathProgramCache]: Analyzing trace with hash -158964811, now seen corresponding path program 1 times [2019-09-20 13:25:10,746 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-20 13:25:10,748 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 13:25:10,748 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-20 13:25:10,748 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 13:25:10,748 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-20 13:25:10,765 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-20 13:25:10,866 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-20 13:25:10,866 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-09-20 13:25:10,866 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2019-09-20 13:25:10,867 INFO L257 anRefinementStrategy]: Using the first perfect interpolant sequence [2019-09-20 13:25:10,868 INFO L454 AbstractCegarLoop]: Interpolant automaton has 5 states [2019-09-20 13:25:10,868 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2019-09-20 13:25:10,869 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2019-09-20 13:25:10,869 INFO L87 Difference]: Start difference. First operand 14 states and 15 transitions. Second operand 5 states. [2019-09-20 13:25:10,943 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-20 13:25:10,943 INFO L93 Difference]: Finished difference Result 21 states and 23 transitions. [2019-09-20 13:25:10,944 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-09-20 13:25:10,944 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 10 [2019-09-20 13:25:10,945 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-20 13:25:10,945 INFO L225 Difference]: With dead ends: 21 [2019-09-20 13:25:10,945 INFO L226 Difference]: Without dead ends: 18 [2019-09-20 13:25:10,946 INFO L636 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2019-09-20 13:25:10,947 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2019-09-20 13:25:10,950 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2019-09-20 13:25:10,950 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2019-09-20 13:25:10,951 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 20 transitions. [2019-09-20 13:25:10,952 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 20 transitions. Word has length 10 [2019-09-20 13:25:10,952 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-20 13:25:10,952 INFO L475 AbstractCegarLoop]: Abstraction has 18 states and 20 transitions. [2019-09-20 13:25:10,952 INFO L476 AbstractCegarLoop]: Interpolant automaton has 5 states. [2019-09-20 13:25:10,952 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 20 transitions. [2019-09-20 13:25:10,953 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2019-09-20 13:25:10,953 INFO L399 BasicCegarLoop]: Found error trace [2019-09-20 13:25:10,953 INFO L407 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-20 13:25:10,953 INFO L418 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-20 13:25:10,953 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-20 13:25:10,954 INFO L82 PathProgramCache]: Analyzing trace with hash 1017948080, now seen corresponding path program 1 times [2019-09-20 13:25:10,954 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-20 13:25:10,955 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 13:25:10,956 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-20 13:25:10,956 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 13:25:10,956 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-20 13:25:10,969 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-20 13:25:11,241 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-20 13:25:11,242 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-20 13:25:11,242 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-20 13:25:11,243 INFO L205 CegarAbsIntRunner]: Running AI on error trace of length 15 with the following transitions: [2019-09-20 13:25:11,245 INFO L207 CegarAbsIntRunner]: [0], [4], [10], [12], [15], [19], [21], [27], [30], [32], [38], [39], [40], [42] [2019-09-20 13:25:11,281 INFO L148 AbstractInterpreter]: Using domain IntervalDomain [2019-09-20 13:25:11,282 INFO L101 FixpointEngine]: Starting fixpoint engine with domain IntervalDomain (maxUnwinding=3, maxParallelStates=2) [2019-09-20 13:25:11,344 WARN L79 EvaluatorLogger]: Possible loss of precision. Operator ARITHMOD has no precise implementation. [2019-09-20 13:25:11,474 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2019-09-20 13:25:11,477 INFO L272 AbstractInterpreter]: Visited 14 different actions 68 times. Merged at 5 different actions 30 times. Widened at 1 different actions 4 times. Performed 117 root evaluator evaluations with a maximum evaluation depth of 6. Performed 117 inverse root evaluator evaluations with a maximum inverse evaluation depth of 6. Found 1 fixpoints after 1 different actions. Largest state had 7 variables. [2019-09-20 13:25:11,480 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-20 13:25:11,481 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-09-20 13:25:11,481 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-20 13:25:11,481 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 [2019-09-20 13:25:11,497 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-20 13:25:11,497 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-09-20 13:25:11,527 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-20 13:25:11,530 INFO L256 TraceCheckSpWp]: Trace formula consists of 36 conjuncts, 15 conjunts are in the unsatisfiable core [2019-09-20 13:25:11,540 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-20 13:25:11,734 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-09-20 13:25:11,782 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-20 13:25:11,782 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-20 13:25:12,010 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-20 13:25:12,015 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-09-20 13:25:12,015 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 21 [2019-09-20 13:25:12,015 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-20 13:25:12,016 INFO L454 AbstractCegarLoop]: Interpolant automaton has 16 states [2019-09-20 13:25:12,017 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2019-09-20 13:25:12,018 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=336, Unknown=0, NotChecked=0, Total=420 [2019-09-20 13:25:12,021 INFO L87 Difference]: Start difference. First operand 18 states and 20 transitions. Second operand 16 states. [2019-09-20 13:25:12,261 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-20 13:25:12,261 INFO L93 Difference]: Finished difference Result 38 states and 44 transitions. [2019-09-20 13:25:12,262 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2019-09-20 13:25:12,262 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 14 [2019-09-20 13:25:12,262 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-20 13:25:12,265 INFO L225 Difference]: With dead ends: 38 [2019-09-20 13:25:12,265 INFO L226 Difference]: Without dead ends: 34 [2019-09-20 13:25:12,266 INFO L636 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 139 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=120, Invalid=480, Unknown=0, NotChecked=0, Total=600 [2019-09-20 13:25:12,266 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2019-09-20 13:25:12,270 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 27. [2019-09-20 13:25:12,270 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2019-09-20 13:25:12,271 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 31 transitions. [2019-09-20 13:25:12,272 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 31 transitions. Word has length 14 [2019-09-20 13:25:12,272 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-20 13:25:12,272 INFO L475 AbstractCegarLoop]: Abstraction has 27 states and 31 transitions. [2019-09-20 13:25:12,272 INFO L476 AbstractCegarLoop]: Interpolant automaton has 16 states. [2019-09-20 13:25:12,273 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 31 transitions. [2019-09-20 13:25:12,273 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2019-09-20 13:25:12,273 INFO L399 BasicCegarLoop]: Found error trace [2019-09-20 13:25:12,274 INFO L407 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-20 13:25:12,274 INFO L418 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-20 13:25:12,274 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-20 13:25:12,274 INFO L82 PathProgramCache]: Analyzing trace with hash -852639511, now seen corresponding path program 1 times [2019-09-20 13:25:12,275 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-20 13:25:12,276 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 13:25:12,276 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-20 13:25:12,276 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 13:25:12,277 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-20 13:25:12,283 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-20 13:25:12,317 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2019-09-20 13:25:12,318 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-09-20 13:25:12,318 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-09-20 13:25:12,318 INFO L257 anRefinementStrategy]: Using the first perfect interpolant sequence [2019-09-20 13:25:12,318 INFO L454 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-09-20 13:25:12,319 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-09-20 13:25:12,319 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-09-20 13:25:12,319 INFO L87 Difference]: Start difference. First operand 27 states and 31 transitions. Second operand 3 states. [2019-09-20 13:25:12,341 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-20 13:25:12,342 INFO L93 Difference]: Finished difference Result 23 states and 25 transitions. [2019-09-20 13:25:12,343 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-09-20 13:25:12,343 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 18 [2019-09-20 13:25:12,343 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-20 13:25:12,344 INFO L225 Difference]: With dead ends: 23 [2019-09-20 13:25:12,344 INFO L226 Difference]: Without dead ends: 23 [2019-09-20 13:25:12,345 INFO L636 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-09-20 13:25:12,345 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2019-09-20 13:25:12,348 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2019-09-20 13:25:12,350 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2019-09-20 13:25:12,351 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 25 transitions. [2019-09-20 13:25:12,352 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 25 transitions. Word has length 18 [2019-09-20 13:25:12,352 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-20 13:25:12,352 INFO L475 AbstractCegarLoop]: Abstraction has 23 states and 25 transitions. [2019-09-20 13:25:12,353 INFO L476 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-09-20 13:25:12,353 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 25 transitions. [2019-09-20 13:25:12,354 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2019-09-20 13:25:12,354 INFO L399 BasicCegarLoop]: Found error trace [2019-09-20 13:25:12,356 INFO L407 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-20 13:25:12,356 INFO L418 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-20 13:25:12,357 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-20 13:25:12,357 INFO L82 PathProgramCache]: Analyzing trace with hash -1920151575, now seen corresponding path program 2 times [2019-09-20 13:25:12,357 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-20 13:25:12,358 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 13:25:12,359 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-20 13:25:12,359 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 13:25:12,359 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-20 13:25:12,392 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-20 13:25:12,450 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-20 13:25:12,450 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-20 13:25:12,451 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-20 13:25:12,451 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-09-20 13:25:12,451 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-09-20 13:25:12,451 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-20 13:25:12,451 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) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-20 13:25:12,473 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-09-20 13:25:12,473 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-09-20 13:25:12,487 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2019-09-20 13:25:12,487 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-20 13:25:12,488 INFO L256 TraceCheckSpWp]: Trace formula consists of 42 conjuncts, 5 conjunts are in the unsatisfiable core [2019-09-20 13:25:12,489 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-20 13:25:12,522 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-20 13:25:12,522 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-20 13:25:12,562 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-20 13:25:12,567 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-09-20 13:25:12,567 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 11 [2019-09-20 13:25:12,568 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-20 13:25:12,569 INFO L454 AbstractCegarLoop]: Interpolant automaton has 8 states [2019-09-20 13:25:12,569 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2019-09-20 13:25:12,569 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=58, Unknown=0, NotChecked=0, Total=110 [2019-09-20 13:25:12,569 INFO L87 Difference]: Start difference. First operand 23 states and 25 transitions. Second operand 8 states. [2019-09-20 13:25:12,606 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-20 13:25:12,606 INFO L93 Difference]: Finished difference Result 23 states and 24 transitions. [2019-09-20 13:25:12,610 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-09-20 13:25:12,610 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 18 [2019-09-20 13:25:12,610 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-20 13:25:12,611 INFO L225 Difference]: With dead ends: 23 [2019-09-20 13:25:12,611 INFO L226 Difference]: Without dead ends: 23 [2019-09-20 13:25:12,612 INFO L636 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 31 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=52, Invalid=58, Unknown=0, NotChecked=0, Total=110 [2019-09-20 13:25:12,612 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2019-09-20 13:25:12,614 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2019-09-20 13:25:12,614 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2019-09-20 13:25:12,615 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 24 transitions. [2019-09-20 13:25:12,615 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 24 transitions. Word has length 18 [2019-09-20 13:25:12,616 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-20 13:25:12,616 INFO L475 AbstractCegarLoop]: Abstraction has 23 states and 24 transitions. [2019-09-20 13:25:12,616 INFO L476 AbstractCegarLoop]: Interpolant automaton has 8 states. [2019-09-20 13:25:12,616 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 24 transitions. [2019-09-20 13:25:12,617 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2019-09-20 13:25:12,617 INFO L399 BasicCegarLoop]: Found error trace [2019-09-20 13:25:12,617 INFO L407 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-20 13:25:12,618 INFO L418 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-20 13:25:12,618 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-20 13:25:12,618 INFO L82 PathProgramCache]: Analyzing trace with hash -1780946716, now seen corresponding path program 3 times [2019-09-20 13:25:12,618 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-20 13:25:12,620 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 13:25:12,620 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-20 13:25:12,620 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 13:25:12,620 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-20 13:25:12,632 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-20 13:25:12,694 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 7 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-20 13:25:12,694 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-20 13:25:12,694 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-20 13:25:12,694 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-09-20 13:25:12,695 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-09-20 13:25:12,695 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-20 13:25:12,695 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) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-20 13:25:12,719 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-09-20 13:25:12,719 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-09-20 13:25:12,731 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-09-20 13:25:12,732 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-20 13:25:12,732 INFO L256 TraceCheckSpWp]: Trace formula consists of 50 conjuncts, 7 conjunts are in the unsatisfiable core [2019-09-20 13:25:12,734 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-20 13:25:12,801 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 7 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-20 13:25:12,801 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-20 13:25:12,874 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 7 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-20 13:25:12,878 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-09-20 13:25:12,878 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 16 [2019-09-20 13:25:12,879 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-20 13:25:12,879 INFO L454 AbstractCegarLoop]: Interpolant automaton has 12 states [2019-09-20 13:25:12,879 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2019-09-20 13:25:12,880 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=110, Invalid=130, Unknown=0, NotChecked=0, Total=240 [2019-09-20 13:25:12,880 INFO L87 Difference]: Start difference. First operand 23 states and 24 transitions. Second operand 12 states. [2019-09-20 13:25:12,935 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-20 13:25:12,935 INFO L93 Difference]: Finished difference Result 25 states and 26 transitions. [2019-09-20 13:25:12,936 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-09-20 13:25:12,936 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 22 [2019-09-20 13:25:12,936 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-20 13:25:12,937 INFO L225 Difference]: With dead ends: 25 [2019-09-20 13:25:12,937 INFO L226 Difference]: Without dead ends: 25 [2019-09-20 13:25:12,938 INFO L636 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 35 SyntacticMatches, 1 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 93 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=110, Invalid=130, Unknown=0, NotChecked=0, Total=240 [2019-09-20 13:25:12,938 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2019-09-20 13:25:12,940 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 24. [2019-09-20 13:25:12,941 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2019-09-20 13:25:12,941 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 25 transitions. [2019-09-20 13:25:12,942 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 25 transitions. Word has length 22 [2019-09-20 13:25:12,942 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-20 13:25:12,942 INFO L475 AbstractCegarLoop]: Abstraction has 24 states and 25 transitions. [2019-09-20 13:25:12,942 INFO L476 AbstractCegarLoop]: Interpolant automaton has 12 states. [2019-09-20 13:25:12,943 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 25 transitions. [2019-09-20 13:25:12,943 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2019-09-20 13:25:12,944 INFO L399 BasicCegarLoop]: Found error trace [2019-09-20 13:25:12,944 INFO L407 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-20 13:25:12,944 INFO L418 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-20 13:25:12,944 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-20 13:25:12,945 INFO L82 PathProgramCache]: Analyzing trace with hash -971600090, now seen corresponding path program 2 times [2019-09-20 13:25:12,945 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-20 13:25:12,947 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 13:25:12,947 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-20 13:25:12,947 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 13:25:12,947 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-20 13:25:12,963 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-20 13:25:13,173 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2019-09-20 13:25:13,173 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-20 13:25:13,174 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-20 13:25:13,174 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-09-20 13:25:13,174 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-09-20 13:25:13,174 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-20 13:25:13,174 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) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-20 13:25:13,208 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-09-20 13:25:13,208 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-09-20 13:25:13,221 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2019-09-20 13:25:13,222 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-20 13:25:13,223 INFO L256 TraceCheckSpWp]: Trace formula consists of 52 conjuncts, 23 conjunts are in the unsatisfiable core [2019-09-20 13:25:13,225 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-20 13:25:13,423 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-09-20 13:25:13,454 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-20 13:25:13,455 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-20 13:25:13,774 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-20 13:25:13,778 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-09-20 13:25:13,779 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13, 13] total 30 [2019-09-20 13:25:13,779 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-20 13:25:13,779 INFO L454 AbstractCegarLoop]: Interpolant automaton has 21 states [2019-09-20 13:25:13,780 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2019-09-20 13:25:13,781 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=125, Invalid=745, Unknown=0, NotChecked=0, Total=870 [2019-09-20 13:25:13,781 INFO L87 Difference]: Start difference. First operand 24 states and 25 transitions. Second operand 21 states. [2019-09-20 13:25:14,323 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-20 13:25:14,323 INFO L93 Difference]: Finished difference Result 40 states and 44 transitions. [2019-09-20 13:25:14,325 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2019-09-20 13:25:14,325 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 22 [2019-09-20 13:25:14,325 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-20 13:25:14,326 INFO L225 Difference]: With dead ends: 40 [2019-09-20 13:25:14,326 INFO L226 Difference]: Without dead ends: 36 [2019-09-20 13:25:14,327 INFO L636 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 459 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=288, Invalid=1604, Unknown=0, NotChecked=0, Total=1892 [2019-09-20 13:25:14,328 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2019-09-20 13:25:14,331 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 28. [2019-09-20 13:25:14,331 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2019-09-20 13:25:14,332 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 30 transitions. [2019-09-20 13:25:14,332 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 30 transitions. Word has length 22 [2019-09-20 13:25:14,332 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-20 13:25:14,332 INFO L475 AbstractCegarLoop]: Abstraction has 28 states and 30 transitions. [2019-09-20 13:25:14,332 INFO L476 AbstractCegarLoop]: Interpolant automaton has 21 states. [2019-09-20 13:25:14,333 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 30 transitions. [2019-09-20 13:25:14,333 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2019-09-20 13:25:14,333 INFO L399 BasicCegarLoop]: Found error trace [2019-09-20 13:25:14,334 INFO L407 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-20 13:25:14,334 INFO L418 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-20 13:25:14,334 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-20 13:25:14,334 INFO L82 PathProgramCache]: Analyzing trace with hash -131462049, now seen corresponding path program 4 times [2019-09-20 13:25:14,334 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-20 13:25:14,336 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 13:25:14,336 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-20 13:25:14,336 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 13:25:14,337 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-20 13:25:14,348 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-20 13:25:14,413 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 10 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-20 13:25:14,414 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-20 13:25:14,414 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-20 13:25:14,414 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-09-20 13:25:14,414 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-09-20 13:25:14,415 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-20 13:25:14,415 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) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-20 13:25:14,440 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-20 13:25:14,441 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-09-20 13:25:14,451 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-20 13:25:14,452 INFO L256 TraceCheckSpWp]: Trace formula consists of 58 conjuncts, 9 conjunts are in the unsatisfiable core [2019-09-20 13:25:14,454 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-20 13:25:14,521 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 10 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-20 13:25:14,521 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-20 13:25:14,600 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 10 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-20 13:25:14,604 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-09-20 13:25:14,604 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 18 [2019-09-20 13:25:14,604 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-20 13:25:14,605 INFO L454 AbstractCegarLoop]: Interpolant automaton has 16 states [2019-09-20 13:25:14,605 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2019-09-20 13:25:14,606 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=132, Invalid=174, Unknown=0, NotChecked=0, Total=306 [2019-09-20 13:25:14,606 INFO L87 Difference]: Start difference. First operand 28 states and 30 transitions. Second operand 16 states. [2019-09-20 13:25:14,678 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-20 13:25:14,678 INFO L93 Difference]: Finished difference Result 33 states and 35 transitions. [2019-09-20 13:25:14,678 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2019-09-20 13:25:14,679 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 26 [2019-09-20 13:25:14,679 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-20 13:25:14,679 INFO L225 Difference]: With dead ends: 33 [2019-09-20 13:25:14,680 INFO L226 Difference]: Without dead ends: 33 [2019-09-20 13:25:14,680 INFO L636 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 39 SyntacticMatches, 5 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 177 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=132, Invalid=174, Unknown=0, NotChecked=0, Total=306 [2019-09-20 13:25:14,681 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2019-09-20 13:25:14,683 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 32. [2019-09-20 13:25:14,683 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2019-09-20 13:25:14,684 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 34 transitions. [2019-09-20 13:25:14,684 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 34 transitions. Word has length 26 [2019-09-20 13:25:14,684 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-20 13:25:14,685 INFO L475 AbstractCegarLoop]: Abstraction has 32 states and 34 transitions. [2019-09-20 13:25:14,685 INFO L476 AbstractCegarLoop]: Interpolant automaton has 16 states. [2019-09-20 13:25:14,685 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 34 transitions. [2019-09-20 13:25:14,685 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2019-09-20 13:25:14,686 INFO L399 BasicCegarLoop]: Found error trace [2019-09-20 13:25:14,686 INFO L407 BasicCegarLoop]: trace histogram [5, 5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-20 13:25:14,686 INFO L418 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-20 13:25:14,686 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-20 13:25:14,686 INFO L82 PathProgramCache]: Analyzing trace with hash -1107887526, now seen corresponding path program 5 times [2019-09-20 13:25:14,687 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-20 13:25:14,688 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 13:25:14,688 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-20 13:25:14,688 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 13:25:14,688 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-20 13:25:14,702 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-20 13:25:14,814 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 13 proven. 32 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-20 13:25:14,815 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-20 13:25:14,815 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-20 13:25:14,815 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-09-20 13:25:14,815 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-09-20 13:25:14,815 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-20 13:25:14,816 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 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-20 13:25:14,850 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-09-20 13:25:14,851 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-09-20 13:25:14,870 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2019-09-20 13:25:14,870 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-20 13:25:14,871 INFO L256 TraceCheckSpWp]: Trace formula consists of 66 conjuncts, 11 conjunts are in the unsatisfiable core [2019-09-20 13:25:14,872 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-20 13:25:14,974 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 13 proven. 32 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-20 13:25:14,974 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-20 13:25:15,037 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 13 proven. 32 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-20 13:25:15,040 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-09-20 13:25:15,041 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 20 [2019-09-20 13:25:15,041 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-20 13:25:15,042 INFO L454 AbstractCegarLoop]: Interpolant automaton has 20 states [2019-09-20 13:25:15,043 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2019-09-20 13:25:15,043 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=154, Invalid=226, Unknown=0, NotChecked=0, Total=380 [2019-09-20 13:25:15,045 INFO L87 Difference]: Start difference. First operand 32 states and 34 transitions. Second operand 20 states. [2019-09-20 13:25:15,147 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-20 13:25:15,147 INFO L93 Difference]: Finished difference Result 38 states and 40 transitions. [2019-09-20 13:25:15,148 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2019-09-20 13:25:15,149 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 30 [2019-09-20 13:25:15,149 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-20 13:25:15,150 INFO L225 Difference]: With dead ends: 38 [2019-09-20 13:25:15,153 INFO L226 Difference]: Without dead ends: 38 [2019-09-20 13:25:15,154 INFO L636 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 43 SyntacticMatches, 9 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 261 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=154, Invalid=226, Unknown=0, NotChecked=0, Total=380 [2019-09-20 13:25:15,154 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2019-09-20 13:25:15,159 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 36. [2019-09-20 13:25:15,159 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2019-09-20 13:25:15,160 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 38 transitions. [2019-09-20 13:25:15,160 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 38 transitions. Word has length 30 [2019-09-20 13:25:15,161 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-20 13:25:15,161 INFO L475 AbstractCegarLoop]: Abstraction has 36 states and 38 transitions. [2019-09-20 13:25:15,161 INFO L476 AbstractCegarLoop]: Interpolant automaton has 20 states. [2019-09-20 13:25:15,161 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 38 transitions. [2019-09-20 13:25:15,162 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2019-09-20 13:25:15,163 INFO L399 BasicCegarLoop]: Found error trace [2019-09-20 13:25:15,163 INFO L407 BasicCegarLoop]: trace histogram [6, 6, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-20 13:25:15,164 INFO L418 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-20 13:25:15,164 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-20 13:25:15,164 INFO L82 PathProgramCache]: Analyzing trace with hash -682200363, now seen corresponding path program 6 times [2019-09-20 13:25:15,164 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-20 13:25:15,167 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 13:25:15,167 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-20 13:25:15,168 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 13:25:15,168 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-20 13:25:15,219 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2019-09-20 13:25:15,251 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2019-09-20 13:25:15,278 INFO L474 BasicCegarLoop]: Counterexample might be feasible [2019-09-20 13:25:15,318 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 20.09 01:25:15 BoogieIcfgContainer [2019-09-20 13:25:15,319 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2019-09-20 13:25:15,322 INFO L168 Benchmark]: Toolchain (without parser) took 5598.09 ms. Allocated memory was 132.1 MB in the beginning and 262.7 MB in the end (delta: 130.5 MB). Free memory was 87.7 MB in the beginning and 103.8 MB in the end (delta: -16.1 MB). Peak memory consumption was 114.4 MB. Max. memory is 7.1 GB. [2019-09-20 13:25:15,324 INFO L168 Benchmark]: CDTParser took 0.22 ms. Allocated memory is still 132.1 MB. Free memory was 106.3 MB in the beginning and 106.1 MB in the end (delta: 212.8 kB). Peak memory consumption was 212.8 kB. Max. memory is 7.1 GB. [2019-09-20 13:25:15,326 INFO L168 Benchmark]: CACSL2BoogieTranslator took 282.63 ms. Allocated memory is still 132.1 MB. Free memory was 87.5 MB in the beginning and 78.2 MB in the end (delta: 9.3 MB). Peak memory consumption was 9.3 MB. Max. memory is 7.1 GB. [2019-09-20 13:25:15,328 INFO L168 Benchmark]: Boogie Preprocessor took 131.85 ms. Allocated memory was 132.1 MB in the beginning and 199.2 MB in the end (delta: 67.1 MB). Free memory was 78.2 MB in the beginning and 176.1 MB in the end (delta: -97.9 MB). Peak memory consumption was 16.0 MB. Max. memory is 7.1 GB. [2019-09-20 13:25:15,334 INFO L168 Benchmark]: RCFGBuilder took 242.56 ms. Allocated memory is still 199.2 MB. Free memory was 176.1 MB in the beginning and 163.9 MB in the end (delta: 12.2 MB). Peak memory consumption was 12.2 MB. Max. memory is 7.1 GB. [2019-09-20 13:25:15,335 INFO L168 Benchmark]: TraceAbstraction took 4935.13 ms. Allocated memory was 199.2 MB in the beginning and 262.7 MB in the end (delta: 63.4 MB). Free memory was 163.9 MB in the beginning and 103.8 MB in the end (delta: 60.1 MB). Peak memory consumption was 123.5 MB. Max. memory is 7.1 GB. [2019-09-20 13:25:15,349 INFO L335 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.22 ms. Allocated memory is still 132.1 MB. Free memory was 106.3 MB in the beginning and 106.1 MB in the end (delta: 212.8 kB). Peak memory consumption was 212.8 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 282.63 ms. Allocated memory is still 132.1 MB. Free memory was 87.5 MB in the beginning and 78.2 MB in the end (delta: 9.3 MB). Peak memory consumption was 9.3 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 131.85 ms. Allocated memory was 132.1 MB in the beginning and 199.2 MB in the end (delta: 67.1 MB). Free memory was 78.2 MB in the beginning and 176.1 MB in the end (delta: -97.9 MB). Peak memory consumption was 16.0 MB. Max. memory is 7.1 GB. * RCFGBuilder took 242.56 ms. Allocated memory is still 199.2 MB. Free memory was 176.1 MB in the beginning and 163.9 MB in the end (delta: 12.2 MB). Peak memory consumption was 12.2 MB. Max. memory is 7.1 GB. * TraceAbstraction took 4935.13 ms. Allocated memory was 199.2 MB in the beginning and 262.7 MB in the end (delta: 63.4 MB). Free memory was 163.9 MB in the beginning and 103.8 MB in the end (delta: 60.1 MB). Peak memory consumption was 123.5 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: [L12] int i, j=10, n=__VERIFIER_nondet_uint(), sn=0; [L12] int i, j=10, n=__VERIFIER_nondet_uint(), sn=0; [L13] i=1 VAL [i=1, j=10, n=0, n=6] [L13] COND TRUE i<=n VAL [i=1, j=10, n=6, n=0] [L14] COND TRUE i